net/netfilter/nft_set_rbtree.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
   4  *
   5  * Development of this code funded by Astaro AG (http://www.astaro.com/)
   6  */
   7
   8 #include <linux/kernel.h>
   9 #include <linux/init.h>
  10 #include <linux/module.h>
  11 #include <linux/list.h>
  12 #include <linux/rbtree.h>
  13 #include <linux/netlink.h>
  14 #include <linux/netfilter.h>
  15 #include <linux/netfilter/nf_tables.h>
  16 #include <net/netfilter/nf_tables_core.h>
  17
  18 struct nft_rbtree {
  19         struct rb_root          root;
  20         rwlock_t                lock;
  21         seqcount_rwlock_t       count;
  22         struct delayed_work     gc_work;
  23 };
  24
  25 struct nft_rbtree_elem {
  26         struct rb_node          node;
  27         struct nft_set_ext      ext;
  28 };
  29
  30 static bool nft_rbtree_interval_end(const struct nft_rbtree_elem *rbe)
  31 {
  32         return nft_set_ext_exists(&rbe->ext, NFT_SET_EXT_FLAGS) &&
  33                (*nft_set_ext_flags(&rbe->ext) & NFT_SET_ELEM_INTERVAL_END);
  34 }
  35
  36 static bool nft_rbtree_interval_start(const struct nft_rbtree_elem *rbe)
  37 {
  38         return !nft_rbtree_interval_end(rbe);
  39 }
  40
  41 static int nft_rbtree_cmp(const struct nft_set *set,
  42                           const struct nft_rbtree_elem *e1,
  43                           const struct nft_rbtree_elem *e2)
  44 {
  45         return memcmp(nft_set_ext_key(&e1->ext), nft_set_ext_key(&e2->ext),
  46                       set->klen);
  47 }
  48
  49 static bool __nft_rbtree_lookup(const struct net *net, const struct nft_set *set,
  50                                 const u32 *key, const struct nft_set_ext **ext,
  51                                 unsigned int seq)
  52 {
  53         struct nft_rbtree *priv = nft_set_priv(set);
  54         const struct nft_rbtree_elem *rbe, *interval = NULL;
  55         u8 genmask = nft_genmask_cur(net);
  56         const struct rb_node *parent;
  57         int d;
  58
  59         parent = rcu_dereference_raw(priv->root.rb_node);
  60         while (parent != NULL) {
  61                 if (read_seqcount_retry(&priv->count, seq))
  62                         return false;
  63
  64                 rbe = rb_entry(parent, struct nft_rbtree_elem, node);
  65
  66                 d = memcmp(nft_set_ext_key(&rbe->ext), key, set->klen);
  67                 if (d < 0) {
  68                         parent = rcu_dereference_raw(parent->rb_left);
  69                         if (interval &&
  70                             !nft_rbtree_cmp(set, rbe, interval) &&
  71                             nft_rbtree_interval_end(rbe) &&
  72                             nft_rbtree_interval_start(interval))
  73                                 continue;
  74                         interval = rbe;
  75                 } else if (d > 0)
  76                         parent = rcu_dereference_raw(parent->rb_right);
  77                 else {
  78                         if (!nft_set_elem_active(&rbe->ext, genmask)) {
  79                                 parent = rcu_dereference_raw(parent->rb_left);
  80                                 continue;
  81                         }
  82
  83                         if (nft_set_elem_expired(&rbe->ext))
  84                                 return false;
  85
  86                         if (nft_rbtree_interval_end(rbe)) {
  87                                 if (nft_set_is_anonymous(set))
  88                                         return false;
  89                                 parent = rcu_dereference_raw(parent->rb_left);
  90                                 interval = NULL;
  91                                 continue;
  92                         }
  93
  94                         *ext = &rbe->ext;
  95                         return true;
  96                 }
  97         }
  98
  99         if (set->flags & NFT_SET_INTERVAL && interval != NULL &&
 100             nft_set_elem_active(&interval->ext, genmask) &&
 101             !nft_set_elem_expired(&interval->ext) &&
 102             nft_rbtree_interval_start(interval)) {
 103                 *ext = &interval->ext;
 104                 return true;
 105         }
 106
 107         return false;
 108 }
 109
 110 INDIRECT_CALLABLE_SCOPE
 111 bool nft_rbtree_lookup(const struct net *net, const struct nft_set *set,
 112                        const u32 *key, const struct nft_set_ext **ext)
 113 {
 114         struct nft_rbtree *priv = nft_set_priv(set);
 115         unsigned int seq = read_seqcount_begin(&priv->count);
 116         bool ret;
 117
 118         ret = __nft_rbtree_lookup(net, set, key, ext, seq);
 119         if (ret || !read_seqcount_retry(&priv->count, seq))
 120                 return ret;
 121
 122         read_lock_bh(&priv->lock);
 123         seq = read_seqcount_begin(&priv->count);
 124         ret = __nft_rbtree_lookup(net, set, key, ext, seq);
 125         read_unlock_bh(&priv->lock);
 126
 127         return ret;
 128 }
 129
 130 static bool __nft_rbtree_get(const struct net *net, const struct nft_set *set,
 131                              const u32 *key, struct nft_rbtree_elem **elem,
 132                              unsigned int seq, unsigned int flags, u8 genmask)
 133 {
 134         struct nft_rbtree_elem *rbe, *interval = NULL;
 135         struct nft_rbtree *priv = nft_set_priv(set);
 136         const struct rb_node *parent;
 137         const void *this;
 138         int d;
 139
 140         parent = rcu_dereference_raw(priv->root.rb_node);
 141         while (parent != NULL) {
 142                 if (read_seqcount_retry(&priv->count, seq))
 143                         return false;
 144
 145                 rbe = rb_entry(parent, struct nft_rbtree_elem, node);
 146
 147                 this = nft_set_ext_key(&rbe->ext);
 148                 d = memcmp(this, key, set->klen);
 149                 if (d < 0) {
 150                         parent = rcu_dereference_raw(parent->rb_left);
 151                         if (!(flags & NFT_SET_ELEM_INTERVAL_END))
 152                                 interval = rbe;
 153                 } else if (d > 0) {
 154                         parent = rcu_dereference_raw(parent->rb_right);
 155                         if (flags & NFT_SET_ELEM_INTERVAL_END)
 156                                 interval = rbe;
 157                 } else {
 158                         if (!nft_set_elem_active(&rbe->ext, genmask)) {
 159                                 parent = rcu_dereference_raw(parent->rb_left);
 160                                 continue;
 161                         }
 162
 163                         if (nft_set_elem_expired(&rbe->ext))
 164                                 return false;
 165
 166                         if (!nft_set_ext_exists(&rbe->ext, NFT_SET_EXT_FLAGS) ||
 167                             (*nft_set_ext_flags(&rbe->ext) & NFT_SET_ELEM_INTERVAL_END) ==
 168                             (flags & NFT_SET_ELEM_INTERVAL_END)) {
 169                                 *elem = rbe;
 170                                 return true;
 171                         }
 172
 173                         if (nft_rbtree_interval_end(rbe))
 174                                 interval = NULL;
 175
 176                         parent = rcu_dereference_raw(parent->rb_left);
 177                 }
 178         }
 179
 180         if (set->flags & NFT_SET_INTERVAL && interval != NULL &&
 181             nft_set_elem_active(&interval->ext, genmask) &&
 182             !nft_set_elem_expired(&interval->ext) &&
 183             ((!nft_rbtree_interval_end(interval) &&
 184               !(flags & NFT_SET_ELEM_INTERVAL_END)) ||
 185              (nft_rbtree_interval_end(interval) &&
 186               (flags & NFT_SET_ELEM_INTERVAL_END)))) {
 187                 *elem = interval;
 188                 return true;
 189         }
 190
 191         return false;
 192 }
 193
 194 static void *nft_rbtree_get(const struct net *net, const struct nft_set *set,
 195                             const struct nft_set_elem *elem, unsigned int flags)
 196 {
 197         struct nft_rbtree *priv = nft_set_priv(set);
 198         unsigned int seq = read_seqcount_begin(&priv->count);
 199         struct nft_rbtree_elem *rbe = ERR_PTR(-ENOENT);
 200         const u32 *key = (const u32 *)&elem->key.val;
 201         u8 genmask = nft_genmask_cur(net);
 202         bool ret;
 203
 204         ret = __nft_rbtree_get(net, set, key, &rbe, seq, flags, genmask);
 205         if (ret || !read_seqcount_retry(&priv->count, seq))
 206                 return rbe;
 207
 208         read_lock_bh(&priv->lock);
 209         seq = read_seqcount_begin(&priv->count);
 210         ret = __nft_rbtree_get(net, set, key, &rbe, seq, flags, genmask);
 211         if (!ret)
 212                 rbe = ERR_PTR(-ENOENT);
 213         read_unlock_bh(&priv->lock);
 214
 215         return rbe;
 216 }
 217
 218 static int nft_rbtree_gc_elem(const struct nft_set *__set,
 219                               struct nft_rbtree *priv,
 220                               struct nft_rbtree_elem *rbe)
 221 {
 222         struct nft_set *set = (struct nft_set *)__set;
 223         struct rb_node *prev = rb_prev(&rbe->node);
 224         struct nft_rbtree_elem *rbe_prev;
 225         struct nft_set_gc_batch *gcb;
 226
 227         gcb = nft_set_gc_batch_check(set, NULL, GFP_ATOMIC);
 228         if (!gcb)
 229                 return -ENOMEM;
 230
 231         /* search for expired end interval coming before this element. */
 232         do {
 233                 rbe_prev = rb_entry(prev, struct nft_rbtree_elem, node);
 234                 if (nft_rbtree_interval_end(rbe_prev))
 235                         break;
 236
 237                 prev = rb_prev(prev);
 238         } while (prev != NULL);
 239
 240         rb_erase(&rbe_prev->node, &priv->root);
 241         rb_erase(&rbe->node, &priv->root);
 242         atomic_sub(2, &set->nelems);
 243
 244         nft_set_gc_batch_add(gcb, rbe);
 245         nft_set_gc_batch_complete(gcb);
 246
 247         return 0;
 248 }
 249
 250 static bool nft_rbtree_update_first(const struct nft_set *set,
 251                                     struct nft_rbtree_elem *rbe,
 252                                     struct rb_node *first)
 253 {
 254         struct nft_rbtree_elem *first_elem;
 255
 256         first_elem = rb_entry(first, struct nft_rbtree_elem, node);
 257         /* this element is closest to where the new element is to be inserted:
 258          * update the first element for the node list path.
 259          */
 260         if (nft_rbtree_cmp(set, rbe, first_elem) < 0)
 261                 return true;
 262
 263         return false;
 264 }
 265
 266 static int __nft_rbtree_insert(const struct net *net, const struct nft_set *set,
 267                                struct nft_rbtree_elem *new,
 268                                struct nft_set_ext **ext)
 269 {
 270         struct nft_rbtree_elem *rbe, *rbe_le = NULL, *rbe_ge = NULL;
 271         struct rb_node *node, *parent, **p, *first = NULL;
 272         struct nft_rbtree *priv = nft_set_priv(set);
 273         u8 genmask = nft_genmask_next(net);
 274         int d, err;
 275
 276         /* Descend the tree to search for an existing element greater than the
 277          * key value to insert that is greater than the new element. This is the
 278          * first element to walk the ordered elements to find possible overlap.
 279          */
 280         parent = NULL;
 281         p = &priv->root.rb_node;
 282         while (*p != NULL) {
 283                 parent = *p;
 284                 rbe = rb_entry(parent, struct nft_rbtree_elem, node);
 285                 d = nft_rbtree_cmp(set, rbe, new);
 286
 287                 if (d < 0) {
 288                         p = &parent->rb_left;
 289                 } else if (d > 0) {
 290                         if (!first ||
 291                             nft_rbtree_update_first(set, rbe, first))
 292                                 first = &rbe->node;
 293
 294                         p = &parent->rb_right;
 295                 } else {
 296                         if (nft_rbtree_interval_end(rbe))
 297                                 p = &parent->rb_left;
 298                         else
 299                                 p = &parent->rb_right;
 300                 }
 301         }
 302
 303         if (!first)
 304                 first = rb_first(&priv->root);
 305
 306         /* Detect overlap by going through the list of valid tree nodes.
 307          * Values stored in the tree are in reversed order, starting from
 308          * highest to lowest value.
 309          */
 310         for (node = first; node != NULL; node = rb_next(node)) {
 311                 rbe = rb_entry(node, struct nft_rbtree_elem, node);
 312
 313                 if (!nft_set_elem_active(&rbe->ext, genmask))
 314                         continue;
 315
 316                 /* perform garbage collection to avoid bogus overlap reports. */
 317                 if (nft_set_elem_expired(&rbe->ext)) {
 318                         err = nft_rbtree_gc_elem(set, priv, rbe);
 319                         if (err < 0)
 320                                 return err;
 321
 322                         continue;
 323                 }
 324
 325                 d = nft_rbtree_cmp(set, rbe, new);
 326                 if (d == 0) {
 327                         /* Matching end element: no need to look for an
 328                          * overlapping greater or equal element.
 329                          */
 330                         if (nft_rbtree_interval_end(rbe)) {
 331                                 rbe_le = rbe;
 332                                 break;
 333                         }
 334
 335                         /* first element that is greater or equal to key value. */
 336                         if (!rbe_ge) {
 337                                 rbe_ge = rbe;
 338                                 continue;
 339                         }
 340
 341                         /* this is a closer more or equal element, update it. */
 342                         if (nft_rbtree_cmp(set, rbe_ge, new) != 0) {
 343                                 rbe_ge = rbe;
 344                                 continue;
 345                         }
 346
 347                         /* element is equal to key value, make sure flags are
 348                          * the same, an existing more or equal start element
 349                          * must not be replaced by more or equal end element.
 350                          */
 351                         if ((nft_rbtree_interval_start(new) &&
 352                              nft_rbtree_interval_start(rbe_ge)) ||
 353                             (nft_rbtree_interval_end(new) &&
 354                              nft_rbtree_interval_end(rbe_ge))) {
 355                                 rbe_ge = rbe;
 356                                 continue;
 357                         }
 358                 } else if (d > 0) {
 359                         /* annotate element greater than the new element. */
 360                         rbe_ge = rbe;
 361                         continue;
 362                 } else if (d < 0) {
 363                         /* annotate element less than the new element. */
 364                         rbe_le = rbe;
 365                         break;
 366                 }
 367         }
 368
 369         /* - new start element matching existing start element: full overlap
 370          *   reported as -EEXIST, cleared by caller if NLM_F_EXCL is not given.
 371          */
 372         if (rbe_ge && !nft_rbtree_cmp(set, new, rbe_ge) &&
 373             nft_rbtree_interval_start(rbe_ge) == nft_rbtree_interval_start(new)) {
 374                 *ext = &rbe_ge->ext;
 375                 return -EEXIST;
 376         }
 377
 378         /* - new end element matching existing end element: full overlap
 379          *   reported as -EEXIST, cleared by caller if NLM_F_EXCL is not given.
 380          */
 381         if (rbe_le && !nft_rbtree_cmp(set, new, rbe_le) &&
 382             nft_rbtree_interval_end(rbe_le) == nft_rbtree_interval_end(new)) {
 383                 *ext = &rbe_le->ext;
 384                 return -EEXIST;
 385         }
 386
 387         /* - new start element with existing closest, less or equal key value
 388          *   being a start element: partial overlap, reported as -ENOTEMPTY.
 389          *   Anonymous sets allow for two consecutive start element since they
 390          *   are constant, skip them to avoid bogus overlap reports.
 391          */
 392         if (!nft_set_is_anonymous(set) && rbe_le &&
 393             nft_rbtree_interval_start(rbe_le) && nft_rbtree_interval_start(new))
 394                 return -ENOTEMPTY;
 395
 396         /* - new end element with existing closest, less or equal key value
 397          *   being a end element: partial overlap, reported as -ENOTEMPTY.
 398          */
 399         if (rbe_le &&
 400             nft_rbtree_interval_end(rbe_le) && nft_rbtree_interval_end(new))
 401                 return -ENOTEMPTY;
 402
 403         /* - new end element with existing closest, greater or equal key value
 404          *   being an end element: partial overlap, reported as -ENOTEMPTY
 405          */
 406         if (rbe_ge &&
 407             nft_rbtree_interval_end(rbe_ge) && nft_rbtree_interval_end(new))
 408                 return -ENOTEMPTY;
 409
 410         /* Accepted element: pick insertion point depending on key value */
 411         parent = NULL;
 412         p = &priv->root.rb_node;
 413         while (*p != NULL) {
 414                 parent = *p;
 415                 rbe = rb_entry(parent, struct nft_rbtree_elem, node);
 416                 d = nft_rbtree_cmp(set, rbe, new);
 417
 418                 if (d < 0)
 419                         p = &parent->rb_left;
 420                 else if (d > 0)
 421                         p = &parent->rb_right;
 422                 else if (nft_rbtree_interval_end(rbe))
 423                         p = &parent->rb_left;
 424                 else
 425                         p = &parent->rb_right;
 426         }
 427
 428         rb_link_node_rcu(&new->node, parent, p);
 429         rb_insert_color(&new->node, &priv->root);
 430         return 0;
 431 }
 432
 433 static int nft_rbtree_insert(const struct net *net, const struct nft_set *set,
 434                              const struct nft_set_elem *elem,
 435                              struct nft_set_ext **ext)
 436 {
 437         struct nft_rbtree *priv = nft_set_priv(set);
 438         struct nft_rbtree_elem *rbe = elem->priv;
 439         int err;
 440
 441         write_lock_bh(&priv->lock);
 442         write_seqcount_begin(&priv->count);
 443         err = __nft_rbtree_insert(net, set, rbe, ext);
 444         write_seqcount_end(&priv->count);
 445         write_unlock_bh(&priv->lock);
 446
 447         return err;
 448 }
 449
 450 static void nft_rbtree_remove(const struct net *net,
 451                               const struct nft_set *set,
 452                               const struct nft_set_elem *elem)
 453 {
 454         struct nft_rbtree *priv = nft_set_priv(set);
 455         struct nft_rbtree_elem *rbe = elem->priv;
 456
 457         write_lock_bh(&priv->lock);
 458         write_seqcount_begin(&priv->count);
 459         rb_erase(&rbe->node, &priv->root);
 460         write_seqcount_end(&priv->count);
 461         write_unlock_bh(&priv->lock);
 462 }
 463
 464 static void nft_rbtree_activate(const struct net *net,
 465                                 const struct nft_set *set,
 466                                 const struct nft_set_elem *elem)
 467 {
 468         struct nft_rbtree_elem *rbe = elem->priv;
 469
 470         nft_set_elem_change_active(net, set, &rbe->ext);
 471         nft_set_elem_clear_busy(&rbe->ext);
 472 }
 473
 474 static bool nft_rbtree_flush(const struct net *net,
 475                              const struct nft_set *set, void *priv)
 476 {
 477         struct nft_rbtree_elem *rbe = priv;
 478
 479         if (!nft_set_elem_mark_busy(&rbe->ext) ||
 480             !nft_is_active(net, &rbe->ext)) {
 481                 nft_set_elem_change_active(net, set, &rbe->ext);
 482                 return true;
 483         }
 484         return false;
 485 }
 486
 487 static void *nft_rbtree_deactivate(const struct net *net,
 488                                    const struct nft_set *set,
 489                                    const struct nft_set_elem *elem)
 490 {
 491         const struct nft_rbtree *priv = nft_set_priv(set);
 492         const struct rb_node *parent = priv->root.rb_node;
 493         struct nft_rbtree_elem *rbe, *this = elem->priv;
 494         u8 genmask = nft_genmask_next(net);
 495         int d;
 496
 497         while (parent != NULL) {
 498                 rbe = rb_entry(parent, struct nft_rbtree_elem, node);
 499
 500                 d = memcmp(nft_set_ext_key(&rbe->ext), &elem->key.val,
 501                                            set->klen);
 502                 if (d < 0)
 503                         parent = parent->rb_left;
 504                 else if (d > 0)
 505                         parent = parent->rb_right;
 506                 else {
 507                         if (nft_rbtree_interval_end(rbe) &&
 508                             nft_rbtree_interval_start(this)) {
 509                                 parent = parent->rb_left;
 510                                 continue;
 511                         } else if (nft_rbtree_interval_start(rbe) &&
 512                                    nft_rbtree_interval_end(this)) {
 513                                 parent = parent->rb_right;
 514                                 continue;
 515                         } else if (!nft_set_elem_active(&rbe->ext, genmask)) {
 516                                 parent = parent->rb_left;
 517                                 continue;
 518                         }
 519                         nft_rbtree_flush(net, set, rbe);
 520                         return rbe;
 521                 }
 522         }
 523         return NULL;
 524 }
 525
 526 static void nft_rbtree_walk(const struct nft_ctx *ctx,
 527                             struct nft_set *set,
 528                             struct nft_set_iter *iter)
 529 {
 530         struct nft_rbtree *priv = nft_set_priv(set);
 531         struct nft_rbtree_elem *rbe;
 532         struct nft_set_elem elem;
 533         struct rb_node *node;
 534
 535         read_lock_bh(&priv->lock);
 536         for (node = rb_first(&priv->root); node != NULL; node = rb_next(node)) {
 537                 rbe = rb_entry(node, struct nft_rbtree_elem, node);
 538
 539                 if (iter->count < iter->skip)
 540                         goto cont;
 541                 if (nft_set_elem_expired(&rbe->ext))
 542                         goto cont;
 543                 if (!nft_set_elem_active(&rbe->ext, iter->genmask))
 544                         goto cont;
 545
 546                 elem.priv = rbe;
 547
 548                 iter->err = iter->fn(ctx, set, iter, &elem);
 549                 if (iter->err < 0) {
 550                         read_unlock_bh(&priv->lock);
 551                         return;
 552                 }
 553 cont:
 554                 iter->count++;
 555         }
 556         read_unlock_bh(&priv->lock);
 557 }
 558
 559 static void nft_rbtree_gc(struct work_struct *work)
 560 {
 561         struct nft_rbtree_elem *rbe, *rbe_end = NULL, *rbe_prev = NULL;
 562         struct nft_set_gc_batch *gcb = NULL;
 563         struct nft_rbtree *priv;
 564         struct rb_node *node;
 565         struct nft_set *set;
 566         struct net *net;
 567         u8 genmask;
 568
 569         priv = container_of(work, struct nft_rbtree, gc_work.work);
 570         set  = nft_set_container_of(priv);
 571         net  = read_pnet(&set->net);
 572         genmask = nft_genmask_cur(net);
 573
 574         write_lock_bh(&priv->lock);
 575         write_seqcount_begin(&priv->count);
 576         for (node = rb_first(&priv->root); node != NULL; node = rb_next(node)) {
 577                 rbe = rb_entry(node, struct nft_rbtree_elem, node);
 578
 579                 if (!nft_set_elem_active(&rbe->ext, genmask))
 580                         continue;
 581
 582                 /* elements are reversed in the rbtree for historical reasons,
 583                  * from highest to lowest value, that is why end element is
 584                  * always visited before the start element.
 585                  */
 586                 if (nft_rbtree_interval_end(rbe)) {
 587                         rbe_end = rbe;
 588                         continue;
 589                 }
 590                 if (!nft_set_elem_expired(&rbe->ext))
 591                         continue;
 592
 593                 if (nft_set_elem_mark_busy(&rbe->ext)) {
 594                         rbe_end = NULL;
 595                         continue;
 596                 }
 597
 598                 if (rbe_prev) {
 599                         rb_erase(&rbe_prev->node, &priv->root);
 600                         rbe_prev = NULL;
 601                 }
 602                 gcb = nft_set_gc_batch_check(set, gcb, GFP_ATOMIC);
 603                 if (!gcb)
 604                         break;
 605
 606                 atomic_dec(&set->nelems);
 607                 nft_set_gc_batch_add(gcb, rbe);
 608                 rbe_prev = rbe;
 609
 610                 if (rbe_end) {
 611                         atomic_dec(&set->nelems);
 612                         nft_set_gc_batch_add(gcb, rbe_end);
 613                         rb_erase(&rbe_end->node, &priv->root);
 614                         rbe_end = NULL;
 615                 }
 616                 node = rb_next(node);
 617                 if (!node)
 618                         break;
 619         }
 620         if (rbe_prev)
 621                 rb_erase(&rbe_prev->node, &priv->root);
 622         write_seqcount_end(&priv->count);
 623         write_unlock_bh(&priv->lock);
 624
 625         rbe = nft_set_catchall_gc(set);
 626         if (rbe) {
 627                 gcb = nft_set_gc_batch_check(set, gcb, GFP_ATOMIC);
 628                 if (gcb)
 629                         nft_set_gc_batch_add(gcb, rbe);
 630         }
 631         nft_set_gc_batch_complete(gcb);
 632
 633         queue_delayed_work(system_power_efficient_wq, &priv->gc_work,
 634                            nft_set_gc_interval(set));
 635 }
 636
 637 static u64 nft_rbtree_privsize(const struct nlattr * const nla[],
 638                                const struct nft_set_desc *desc)
 639 {
 640         return sizeof(struct nft_rbtree);
 641 }
 642
 643 static int nft_rbtree_init(const struct nft_set *set,
 644                            const struct nft_set_desc *desc,
 645                            const struct nlattr * const nla[])
 646 {
 647         struct nft_rbtree *priv = nft_set_priv(set);
 648
 649         rwlock_init(&priv->lock);
 650         seqcount_rwlock_init(&priv->count, &priv->lock);
 651         priv->root = RB_ROOT;
 652
 653         INIT_DEFERRABLE_WORK(&priv->gc_work, nft_rbtree_gc);
 654         if (set->flags & NFT_SET_TIMEOUT)
 655                 queue_delayed_work(system_power_efficient_wq, &priv->gc_work,
 656                                    nft_set_gc_interval(set));
 657
 658         return 0;
 659 }
 660
 661 static void nft_rbtree_destroy(const struct nft_set *set)
 662 {
 663         struct nft_rbtree *priv = nft_set_priv(set);
 664         struct nft_rbtree_elem *rbe;
 665         struct rb_node *node;
 666
 667         cancel_delayed_work_sync(&priv->gc_work);
 668         rcu_barrier();
 669         while ((node = priv->root.rb_node) != NULL) {
 670                 rb_erase(node, &priv->root);
 671                 rbe = rb_entry(node, struct nft_rbtree_elem, node);
 672                 nft_set_elem_destroy(set, rbe, true);
 673         }
 674 }
 675
 676 static bool nft_rbtree_estimate(const struct nft_set_desc *desc, u32 features,
 677                                 struct nft_set_estimate *est)
 678 {
 679         if (desc->field_count > 1)
 680                 return false;
 681
 682         if (desc->size)
 683                 est->size = sizeof(struct nft_rbtree) +
 684                             desc->size * sizeof(struct nft_rbtree_elem);
 685         else
 686                 est->size = ~0;
 687
 688         est->lookup = NFT_SET_CLASS_O_LOG_N;
 689         est->space  = NFT_SET_CLASS_O_N;
 690
 691         return true;
 692 }
 693
 694 const struct nft_set_type nft_set_rbtree_type = {
 695         .features       = NFT_SET_INTERVAL | NFT_SET_MAP | NFT_SET_OBJECT | NFT_SET_TIMEOUT,
 696         .ops            = {
 697                 .privsize       = nft_rbtree_privsize,
 698                 .elemsize       = offsetof(struct nft_rbtree_elem, ext),
 699                 .estimate       = nft_rbtree_estimate,
 700                 .init           = nft_rbtree_init,
 701                 .destroy        = nft_rbtree_destroy,
 702                 .insert         = nft_rbtree_insert,
 703                 .remove         = nft_rbtree_remove,
 704                 .deactivate     = nft_rbtree_deactivate,
 705                 .flush          = nft_rbtree_flush,
 706                 .activate       = nft_rbtree_activate,
 707                 .lookup         = nft_rbtree_lookup,
 708                 .walk           = nft_rbtree_walk,
 709                 .get            = nft_rbtree_get,
 710         },
 711 };