net/netfilter/ipset/ip_set_list_set.c

   1 /* Copyright (C) 2008-2013 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
   2  *
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License version 2 as
   5  * published by the Free Software Foundation.
   6  */
   7
   8 /* Kernel module implementing an IP set type: the list:set type */
   9
  10 #include <linux/module.h>
  11 #include <linux/ip.h>
  12 #include <linux/rculist.h>
  13 #include <linux/skbuff.h>
  14 #include <linux/errno.h>
  15
  16 #include <linux/netfilter/ipset/ip_set.h>
  17 #include <linux/netfilter/ipset/ip_set_list.h>
  18
  19 #define IPSET_TYPE_REV_MIN      0
  20 /*                              1    Counters support added */
  21 /*                              2    Comments support added */
  22 #define IPSET_TYPE_REV_MAX      3 /* skbinfo support added */
  23
  24 MODULE_LICENSE("GPL");
  25 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
  26 IP_SET_MODULE_DESC("list:set", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
  27 MODULE_ALIAS("ip_set_list:set");
  28
  29 /* Member elements  */
  30 struct set_elem {
  31         struct rcu_head rcu;
  32         struct list_head list;
  33         struct ip_set *set;     /* Sigh, in order to cleanup reference */
  34         ip_set_id_t id;
  35 } __aligned(__alignof__(u64));
  36
  37 struct set_adt_elem {
  38         ip_set_id_t id;
  39         ip_set_id_t refid;
  40         int before;
  41 };
  42
  43 /* Type structure */
  44 struct list_set {
  45         u32 size;               /* size of set list array */
  46         struct timer_list gc;   /* garbage collection */
  47         struct net *net;        /* namespace */
  48         struct list_head members; /* the set members */
  49 };
  50
  51 static int
  52 list_set_ktest(struct ip_set *set, const struct sk_buff *skb,
  53                const struct xt_action_param *par,
  54                struct ip_set_adt_opt *opt, const struct ip_set_ext *ext)
  55 {
  56         struct list_set *map = set->data;
  57         struct set_elem *e;
  58         u32 cmdflags = opt->cmdflags;
  59         int ret;
  60
  61         /* Don't lookup sub-counters at all */
  62         opt->cmdflags &= ~IPSET_FLAG_MATCH_COUNTERS;
  63         if (opt->cmdflags & IPSET_FLAG_SKIP_SUBCOUNTER_UPDATE)
  64                 opt->cmdflags &= ~IPSET_FLAG_SKIP_COUNTER_UPDATE;
  65         list_for_each_entry_rcu(e, &map->members, list) {
  66                 if (SET_WITH_TIMEOUT(set) &&
  67                     ip_set_timeout_expired(ext_timeout(e, set)))
  68                         continue;
  69                 ret = ip_set_test(e->id, skb, par, opt);
  70                 if (ret > 0) {
  71                         if (SET_WITH_COUNTER(set))
  72                                 ip_set_update_counter(ext_counter(e, set),
  73                                                       ext, &opt->ext,
  74                                                       cmdflags);
  75                         if (SET_WITH_SKBINFO(set))
  76                                 ip_set_get_skbinfo(ext_skbinfo(e, set),
  77                                                    ext, &opt->ext,
  78                                                    cmdflags);
  79                         return ret;
  80                 }
  81         }
  82         return 0;
  83 }
  84
  85 static int
  86 list_set_kadd(struct ip_set *set, const struct sk_buff *skb,
  87               const struct xt_action_param *par,
  88               struct ip_set_adt_opt *opt, const struct ip_set_ext *ext)
  89 {
  90         struct list_set *map = set->data;
  91         struct set_elem *e;
  92         int ret;
  93
  94         list_for_each_entry(e, &map->members, list) {
  95                 if (SET_WITH_TIMEOUT(set) &&
  96                     ip_set_timeout_expired(ext_timeout(e, set)))
  97                         continue;
  98                 ret = ip_set_add(e->id, skb, par, opt);
  99                 if (ret == 0)
 100                         return ret;
 101         }
 102         return 0;
 103 }
 104
 105 static int
 106 list_set_kdel(struct ip_set *set, const struct sk_buff *skb,
 107               const struct xt_action_param *par,
 108               struct ip_set_adt_opt *opt, const struct ip_set_ext *ext)
 109 {
 110         struct list_set *map = set->data;
 111         struct set_elem *e;
 112         int ret;
 113
 114         list_for_each_entry(e, &map->members, list) {
 115                 if (SET_WITH_TIMEOUT(set) &&
 116                     ip_set_timeout_expired(ext_timeout(e, set)))
 117                         continue;
 118                 ret = ip_set_del(e->id, skb, par, opt);
 119                 if (ret == 0)
 120                         return ret;
 121         }
 122         return 0;
 123 }
 124
 125 static int
 126 list_set_kadt(struct ip_set *set, const struct sk_buff *skb,
 127               const struct xt_action_param *par,
 128               enum ipset_adt adt, struct ip_set_adt_opt *opt)
 129 {
 130         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
 131         int ret = -EINVAL;
 132
 133         rcu_read_lock();
 134         switch (adt) {
 135         case IPSET_TEST:
 136                 ret = list_set_ktest(set, skb, par, opt, &ext);
 137                 break;
 138         case IPSET_ADD:
 139                 ret = list_set_kadd(set, skb, par, opt, &ext);
 140                 break;
 141         case IPSET_DEL:
 142                 ret = list_set_kdel(set, skb, par, opt, &ext);
 143                 break;
 144         default:
 145                 break;
 146         }
 147         rcu_read_unlock();
 148
 149         return ret;
 150 }
 151
 152 /* Userspace interfaces: we are protected by the nfnl mutex */
 153
 154 static void
 155 __list_set_del_rcu(struct rcu_head * rcu)
 156 {
 157         struct set_elem *e = container_of(rcu, struct set_elem, rcu);
 158         struct ip_set *set = e->set;
 159         struct list_set *map = set->data;
 160
 161         ip_set_put_byindex(map->net, e->id);
 162         ip_set_ext_destroy(set, e);
 163         kfree(e);
 164 }
 165
 166 static inline void
 167 list_set_del(struct ip_set *set, struct set_elem *e)
 168 {
 169         list_del_rcu(&e->list);
 170         call_rcu(&e->rcu, __list_set_del_rcu);
 171 }
 172
 173 static inline void
 174 list_set_replace(struct set_elem *e, struct set_elem *old)
 175 {
 176         list_replace_rcu(&old->list, &e->list);
 177         call_rcu(&old->rcu, __list_set_del_rcu);
 178 }
 179
 180 static void
 181 set_cleanup_entries(struct ip_set *set)
 182 {
 183         struct list_set *map = set->data;
 184         struct set_elem *e, *n;
 185
 186         list_for_each_entry_safe(e, n, &map->members, list)
 187                 if (ip_set_timeout_expired(ext_timeout(e, set)))
 188                         list_set_del(set, e);
 189 }
 190
 191 static int
 192 list_set_utest(struct ip_set *set, void *value, const struct ip_set_ext *ext,
 193                struct ip_set_ext *mext, u32 flags)
 194 {
 195         struct list_set *map = set->data;
 196         struct set_adt_elem *d = value;
 197         struct set_elem *e, *next, *prev = NULL;
 198         int ret;
 199
 200         list_for_each_entry(e, &map->members, list) {
 201                 if (SET_WITH_TIMEOUT(set) &&
 202                     ip_set_timeout_expired(ext_timeout(e, set)))
 203                         continue;
 204                 else if (e->id != d->id) {
 205                         prev = e;
 206                         continue;
 207                 }
 208
 209                 if (d->before == 0) {
 210                         ret = 1;
 211                 } else if (d->before > 0) {
 212                         next = list_next_entry(e, list);
 213                         ret = !list_is_last(&e->list, &map->members) &&
 214                               next->id == d->refid;
 215                 } else {
 216                         ret = prev && prev->id == d->refid;
 217                 }
 218                 return ret;
 219         }
 220         return 0;
 221 }
 222
 223 static void
 224 list_set_init_extensions(struct ip_set *set, const struct ip_set_ext *ext,
 225                          struct set_elem *e)
 226 {
 227         if (SET_WITH_COUNTER(set))
 228                 ip_set_init_counter(ext_counter(e, set), ext);
 229         if (SET_WITH_COMMENT(set))
 230                 ip_set_init_comment(ext_comment(e, set), ext);
 231         if (SET_WITH_SKBINFO(set))
 232                 ip_set_init_skbinfo(ext_skbinfo(e, set), ext);
 233         /* Update timeout last */
 234         if (SET_WITH_TIMEOUT(set))
 235                 ip_set_timeout_set(ext_timeout(e, set), ext->timeout);
 236 }
 237
 238 static int
 239 list_set_uadd(struct ip_set *set, void *value, const struct ip_set_ext *ext,
 240               struct ip_set_ext *mext, u32 flags)
 241 {
 242         struct list_set *map = set->data;
 243         struct set_adt_elem *d = value;
 244         struct set_elem *e, *n, *prev, *next;
 245         bool flag_exist = flags & IPSET_FLAG_EXIST;
 246
 247         /* Find where to add the new entry */
 248         n = prev = next = NULL;
 249         list_for_each_entry(e, &map->members, list) {
 250                 if (SET_WITH_TIMEOUT(set) &&
 251                     ip_set_timeout_expired(ext_timeout(e, set)))
 252                         continue;
 253                 else if (d->id == e->id)
 254                         n = e;
 255                 else if (d->before == 0 || e->id != d->refid)
 256                         continue;
 257                 else if (d->before > 0)
 258                         next = e;
 259                 else
 260                         prev = e;
 261         }
 262         /* Re-add already existing element */
 263         if (n) {
 264                 if ((d->before > 0 && !next) ||
 265                     (d->before < 0 && !prev))
 266                         return -IPSET_ERR_REF_EXIST;
 267                 if (!flag_exist)
 268                         return -IPSET_ERR_EXIST;
 269                 /* Update extensions */
 270                 ip_set_ext_destroy(set, n);
 271                 list_set_init_extensions(set, ext, n);
 272
 273                 /* Set is already added to the list */
 274                 ip_set_put_byindex(map->net, d->id);
 275                 return 0;
 276         }
 277         /* Add new entry */
 278         if (d->before == 0) {
 279                 /* Append  */
 280                 n = list_empty(&map->members) ? NULL :
 281                     list_last_entry(&map->members, struct set_elem, list);
 282         } else if (d->before > 0) {
 283                 /* Insert after next element */
 284                 if (!list_is_last(&next->list, &map->members))
 285                         n = list_next_entry(next, list);
 286         } else {
 287                 /* Insert before prev element */
 288                 if (prev->list.prev != &map->members)
 289                         n = list_prev_entry(prev, list);
 290         }
 291         /* Can we replace a timed out entry? */
 292         if (n &&
 293             !(SET_WITH_TIMEOUT(set) &&
 294               ip_set_timeout_expired(ext_timeout(n, set))))
 295                 n =  NULL;
 296
 297         e = kzalloc(set->dsize, GFP_ATOMIC);
 298         if (!e)
 299                 return -ENOMEM;
 300         e->id = d->id;
 301         e->set = set;
 302         INIT_LIST_HEAD(&e->list);
 303         list_set_init_extensions(set, ext, e);
 304         if (n)
 305                 list_set_replace(e, n);
 306         else if (next)
 307                 list_add_tail_rcu(&e->list, &next->list);
 308         else if (prev)
 309                 list_add_rcu(&e->list, &prev->list);
 310         else
 311                 list_add_tail_rcu(&e->list, &map->members);
 312
 313         return 0;
 314 }
 315
 316 static int
 317 list_set_udel(struct ip_set *set, void *value, const struct ip_set_ext *ext,
 318               struct ip_set_ext *mext, u32 flags)
 319 {
 320         struct list_set *map = set->data;
 321         struct set_adt_elem *d = value;
 322         struct set_elem *e, *next, *prev = NULL;
 323
 324         list_for_each_entry(e, &map->members, list) {
 325                 if (SET_WITH_TIMEOUT(set) &&
 326                     ip_set_timeout_expired(ext_timeout(e, set)))
 327                         continue;
 328                 else if (e->id != d->id) {
 329                         prev = e;
 330                         continue;
 331                 }
 332
 333                 if (d->before > 0) {
 334                         next = list_next_entry(e, list);
 335                         if (list_is_last(&e->list, &map->members) ||
 336                             next->id != d->refid)
 337                                 return -IPSET_ERR_REF_EXIST;
 338                 } else if (d->before < 0) {
 339                         if (!prev || prev->id != d->refid)
 340                                 return -IPSET_ERR_REF_EXIST;
 341                 }
 342                 list_set_del(set, e);
 343                 return 0;
 344         }
 345         return d->before != 0 ? -IPSET_ERR_REF_EXIST : -IPSET_ERR_EXIST;
 346 }
 347
 348 static int
 349 list_set_uadt(struct ip_set *set, struct nlattr *tb[],
 350               enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 351 {
 352         struct list_set *map = set->data;
 353         ipset_adtfn adtfn = set->variant->adt[adt];
 354         struct set_adt_elem e = { .refid = IPSET_INVALID_ID };
 355         struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
 356         struct ip_set *s;
 357         int ret = 0;
 358
 359         if (tb[IPSET_ATTR_LINENO])
 360                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
 361
 362         if (unlikely(!tb[IPSET_ATTR_NAME] ||
 363                      !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
 364                 return -IPSET_ERR_PROTOCOL;
 365
 366         ret = ip_set_get_extensions(set, tb, &ext);
 367         if (ret)
 368                 return ret;
 369         e.id = ip_set_get_byname(map->net, nla_data(tb[IPSET_ATTR_NAME]), &s);
 370         if (e.id == IPSET_INVALID_ID)
 371                 return -IPSET_ERR_NAME;
 372         /* "Loop detection" */
 373         if (s->type->features & IPSET_TYPE_NAME) {
 374                 ret = -IPSET_ERR_LOOP;
 375                 goto finish;
 376         }
 377
 378         if (tb[IPSET_ATTR_CADT_FLAGS]) {
 379                 u32 f = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
 380
 381                 e.before = f & IPSET_FLAG_BEFORE;
 382         }
 383
 384         if (e.before && !tb[IPSET_ATTR_NAMEREF]) {
 385                 ret = -IPSET_ERR_BEFORE;
 386                 goto finish;
 387         }
 388
 389         if (tb[IPSET_ATTR_NAMEREF]) {
 390                 e.refid = ip_set_get_byname(map->net,
 391                                             nla_data(tb[IPSET_ATTR_NAMEREF]),
 392                                             &s);
 393                 if (e.refid == IPSET_INVALID_ID) {
 394                         ret = -IPSET_ERR_NAMEREF;
 395                         goto finish;
 396                 }
 397                 if (!e.before)
 398                         e.before = -1;
 399         }
 400         if (adt != IPSET_TEST && SET_WITH_TIMEOUT(set))
 401                 set_cleanup_entries(set);
 402
 403         ret = adtfn(set, &e, &ext, &ext, flags);
 404
 405 finish:
 406         if (e.refid != IPSET_INVALID_ID)
 407                 ip_set_put_byindex(map->net, e.refid);
 408         if (adt != IPSET_ADD || ret)
 409                 ip_set_put_byindex(map->net, e.id);
 410
 411         return ip_set_eexist(ret, flags) ? 0 : ret;
 412 }
 413
 414 static void
 415 list_set_flush(struct ip_set *set)
 416 {
 417         struct list_set *map = set->data;
 418         struct set_elem *e, *n;
 419
 420         list_for_each_entry_safe(e, n, &map->members, list)
 421                 list_set_del(set, e);
 422 }
 423
 424 static void
 425 list_set_destroy(struct ip_set *set)
 426 {
 427         struct list_set *map = set->data;
 428         struct set_elem *e, *n;
 429
 430         if (SET_WITH_TIMEOUT(set))
 431                 del_timer_sync(&map->gc);
 432
 433         list_for_each_entry_safe(e, n, &map->members, list) {
 434                 list_del(&e->list);
 435                 ip_set_put_byindex(map->net, e->id);
 436                 ip_set_ext_destroy(set, e);
 437                 kfree(e);
 438         }
 439         kfree(map);
 440
 441         set->data = NULL;
 442 }
 443
 444 static int
 445 list_set_head(struct ip_set *set, struct sk_buff *skb)
 446 {
 447         const struct list_set *map = set->data;
 448         struct nlattr *nested;
 449         struct set_elem *e;
 450         u32 n = 0;
 451
 452         rcu_read_lock();
 453         list_for_each_entry_rcu(e, &map->members, list)
 454                 n++;
 455         rcu_read_unlock();
 456
 457         nested = ipset_nest_start(skb, IPSET_ATTR_DATA);
 458         if (!nested)
 459                 goto nla_put_failure;
 460         if (nla_put_net32(skb, IPSET_ATTR_SIZE, htonl(map->size)) ||
 461             nla_put_net32(skb, IPSET_ATTR_REFERENCES, htonl(set->ref)) ||
 462             nla_put_net32(skb, IPSET_ATTR_MEMSIZE,
 463                           htonl(sizeof(*map) + n * set->dsize)))
 464                 goto nla_put_failure;
 465         if (unlikely(ip_set_put_flags(skb, set)))
 466                 goto nla_put_failure;
 467         ipset_nest_end(skb, nested);
 468
 469         return 0;
 470 nla_put_failure:
 471         return -EMSGSIZE;
 472 }
 473
 474 static int
 475 list_set_list(const struct ip_set *set,
 476               struct sk_buff *skb, struct netlink_callback *cb)
 477 {
 478         const struct list_set *map = set->data;
 479         struct nlattr *atd, *nested;
 480         u32 i = 0, first = cb->args[IPSET_CB_ARG0];
 481         struct set_elem *e;
 482         int ret = 0;
 483
 484         atd = ipset_nest_start(skb, IPSET_ATTR_ADT);
 485         if (!atd)
 486                 return -EMSGSIZE;
 487
 488         rcu_read_lock();
 489         list_for_each_entry_rcu(e, &map->members, list) {
 490                 if (i < first ||
 491                     (SET_WITH_TIMEOUT(set) &&
 492                      ip_set_timeout_expired(ext_timeout(e, set)))) {
 493                         i++;
 494                         continue;
 495                 }
 496                 nested = ipset_nest_start(skb, IPSET_ATTR_DATA);
 497                 if (!nested)
 498                         goto nla_put_failure;
 499                 if (nla_put_string(skb, IPSET_ATTR_NAME,
 500                                    ip_set_name_byindex(map->net, e->id)))
 501                         goto nla_put_failure;
 502                 if (ip_set_put_extensions(skb, set, e, true))
 503                         goto nla_put_failure;
 504                 ipset_nest_end(skb, nested);
 505                 i++;
 506         }
 507
 508         ipset_nest_end(skb, atd);
 509         /* Set listing finished */
 510         cb->args[IPSET_CB_ARG0] = 0;
 511         goto out;
 512
 513 nla_put_failure:
 514         nla_nest_cancel(skb, nested);
 515         if (unlikely(i == first)) {
 516                 nla_nest_cancel(skb, atd);
 517                 cb->args[IPSET_CB_ARG0] = 0;
 518                 ret = -EMSGSIZE;
 519         } else {
 520                 cb->args[IPSET_CB_ARG0] = i;
 521         }
 522         ipset_nest_end(skb, atd);
 523 out:
 524         rcu_read_unlock();
 525         return ret;
 526 }
 527
 528 static bool
 529 list_set_same_set(const struct ip_set *a, const struct ip_set *b)
 530 {
 531         const struct list_set *x = a->data;
 532         const struct list_set *y = b->data;
 533
 534         return x->size == y->size &&
 535                a->timeout == b->timeout &&
 536                a->extensions == b->extensions;
 537 }
 538
 539 static const struct ip_set_type_variant set_variant = {
 540         .kadt   = list_set_kadt,
 541         .uadt   = list_set_uadt,
 542         .adt    = {
 543                 [IPSET_ADD] = list_set_uadd,
 544                 [IPSET_DEL] = list_set_udel,
 545                 [IPSET_TEST] = list_set_utest,
 546         },
 547         .destroy = list_set_destroy,
 548         .flush  = list_set_flush,
 549         .head   = list_set_head,
 550         .list   = list_set_list,
 551         .same_set = list_set_same_set,
 552 };
 553
 554 static void
 555 list_set_gc(unsigned long ul_set)
 556 {
 557         struct ip_set *set = (struct ip_set *)ul_set;
 558         struct list_set *map = set->data;
 559
 560         spin_lock_bh(&set->lock);
 561         set_cleanup_entries(set);
 562         spin_unlock_bh(&set->lock);
 563
 564         map->gc.expires = jiffies + IPSET_GC_PERIOD(set->timeout) * HZ;
 565         add_timer(&map->gc);
 566 }
 567
 568 static void
 569 list_set_gc_init(struct ip_set *set, void (*gc)(unsigned long ul_set))
 570 {
 571         struct list_set *map = set->data;
 572
 573         init_timer(&map->gc);
 574         map->gc.data = (unsigned long)set;
 575         map->gc.function = gc;
 576         map->gc.expires = jiffies + IPSET_GC_PERIOD(set->timeout) * HZ;
 577         add_timer(&map->gc);
 578 }
 579
 580 /* Create list:set type of sets */
 581
 582 static bool
 583 init_list_set(struct net *net, struct ip_set *set, u32 size)
 584 {
 585         struct list_set *map;
 586
 587         map = kzalloc(sizeof(*map), GFP_KERNEL);
 588         if (!map)
 589                 return false;
 590
 591         map->size = size;
 592         map->net = net;
 593         INIT_LIST_HEAD(&map->members);
 594         set->data = map;
 595
 596         return true;
 597 }
 598
 599 static int
 600 list_set_create(struct net *net, struct ip_set *set, struct nlattr *tb[],
 601                 u32 flags)
 602 {
 603         u32 size = IP_SET_LIST_DEFAULT_SIZE;
 604
 605         if (unlikely(!ip_set_optattr_netorder(tb, IPSET_ATTR_SIZE) ||
 606                      !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
 607                      !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
 608                 return -IPSET_ERR_PROTOCOL;
 609
 610         if (tb[IPSET_ATTR_SIZE])
 611                 size = ip_set_get_h32(tb[IPSET_ATTR_SIZE]);
 612         if (size < IP_SET_LIST_MIN_SIZE)
 613                 size = IP_SET_LIST_MIN_SIZE;
 614
 615         set->variant = &set_variant;
 616         set->dsize = ip_set_elem_len(set, tb, sizeof(struct set_elem),
 617                                      __alignof__(struct set_elem));
 618         if (!init_list_set(net, set, size))
 619                 return -ENOMEM;
 620         if (tb[IPSET_ATTR_TIMEOUT]) {
 621                 set->timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
 622                 list_set_gc_init(set, list_set_gc);
 623         }
 624         return 0;
 625 }
 626
 627 static struct ip_set_type list_set_type __read_mostly = {
 628         .name           = "list:set",
 629         .protocol       = IPSET_PROTOCOL,
 630         .features       = IPSET_TYPE_NAME | IPSET_DUMP_LAST,
 631         .dimension      = IPSET_DIM_ONE,
 632         .family         = NFPROTO_UNSPEC,
 633         .revision_min   = IPSET_TYPE_REV_MIN,
 634         .revision_max   = IPSET_TYPE_REV_MAX,
 635         .create         = list_set_create,
 636         .create_policy  = {
 637                 [IPSET_ATTR_SIZE]       = { .type = NLA_U32 },
 638                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
 639                 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
 640         },
 641         .adt_policy     = {
 642                 [IPSET_ATTR_NAME]       = { .type = NLA_STRING,
 643                                             .len = IPSET_MAXNAMELEN },
 644                 [IPSET_ATTR_NAMEREF]    = { .type = NLA_STRING,
 645                                             .len = IPSET_MAXNAMELEN },
 646                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
 647                 [IPSET_ATTR_LINENO]     = { .type = NLA_U32 },
 648                 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
 649                 [IPSET_ATTR_BYTES]      = { .type = NLA_U64 },
 650                 [IPSET_ATTR_PACKETS]    = { .type = NLA_U64 },
 651                 [IPSET_ATTR_COMMENT]    = { .type = NLA_NUL_STRING,
 652                                             .len  = IPSET_MAX_COMMENT_SIZE },
 653                 [IPSET_ATTR_SKBMARK]    = { .type = NLA_U64 },
 654                 [IPSET_ATTR_SKBPRIO]    = { .type = NLA_U32 },
 655                 [IPSET_ATTR_SKBQUEUE]   = { .type = NLA_U16 },
 656         },
 657         .me             = THIS_MODULE,
 658 };
 659
 660 static int __init
 661 list_set_init(void)
 662 {
 663         return ip_set_type_register(&list_set_type);
 664 }
 665
 666 static void __exit
 667 list_set_fini(void)
 668 {
 669         rcu_barrier();
 670         ip_set_type_unregister(&list_set_type);
 671 }
 672
 673 module_init(list_set_init);
 674 module_exit(list_set_fini);