1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2008-2014 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/log2.h> 13 #include <linux/jhash.h> 14 #include <linux/netlink.h> 15 #include <linux/workqueue.h> 16 #include <linux/rhashtable.h> 17 #include <linux/netfilter.h> 18 #include <linux/netfilter/nf_tables.h> 19 #include <net/netfilter/nf_tables_core.h> 20 21 /* We target a hash table size of 4, element hint is 75% of final size */ 22 #define NFT_RHASH_ELEMENT_HINT 3 23 24 struct nft_rhash { 25 struct rhashtable ht; 26 struct delayed_work gc_work; 27 }; 28 29 struct nft_rhash_elem { 30 struct rhash_head node; 31 struct nft_set_ext ext; 32 }; 33 34 struct nft_rhash_cmp_arg { 35 const struct nft_set *set; 36 const u32 *key; 37 u8 genmask; 38 }; 39 40 static inline u32 nft_rhash_key(const void *data, u32 len, u32 seed) 41 { 42 const struct nft_rhash_cmp_arg *arg = data; 43 44 return jhash(arg->key, len, seed); 45 } 46 47 static inline u32 nft_rhash_obj(const void *data, u32 len, u32 seed) 48 { 49 const struct nft_rhash_elem *he = data; 50 51 return jhash(nft_set_ext_key(&he->ext), len, seed); 52 } 53 54 static inline int nft_rhash_cmp(struct rhashtable_compare_arg *arg, 55 const void *ptr) 56 { 57 const struct nft_rhash_cmp_arg *x = arg->key; 58 const struct nft_rhash_elem *he = ptr; 59 60 if (memcmp(nft_set_ext_key(&he->ext), x->key, x->set->klen)) 61 return 1; 62 if (nft_set_elem_expired(&he->ext)) 63 return 1; 64 if (!nft_set_elem_active(&he->ext, x->genmask)) 65 return 1; 66 return 0; 67 } 68 69 static const struct rhashtable_params nft_rhash_params = { 70 .head_offset = offsetof(struct nft_rhash_elem, node), 71 .hashfn = nft_rhash_key, 72 .obj_hashfn = nft_rhash_obj, 73 .obj_cmpfn = nft_rhash_cmp, 74 .automatic_shrinking = true, 75 }; 76 77 static bool nft_rhash_lookup(const struct net *net, const struct nft_set *set, 78 const u32 *key, const struct nft_set_ext **ext) 79 { 80 struct nft_rhash *priv = nft_set_priv(set); 81 const struct nft_rhash_elem *he; 82 struct nft_rhash_cmp_arg arg = { 83 .genmask = nft_genmask_cur(net), 84 .set = set, 85 .key = key, 86 }; 87 88 he = rhashtable_lookup(&priv->ht, &arg, nft_rhash_params); 89 if (he != NULL) 90 *ext = &he->ext; 91 92 return !!he; 93 } 94 95 static void *nft_rhash_get(const struct net *net, const struct nft_set *set, 96 const struct nft_set_elem *elem, unsigned int flags) 97 { 98 struct nft_rhash *priv = nft_set_priv(set); 99 struct nft_rhash_elem *he; 100 struct nft_rhash_cmp_arg arg = { 101 .genmask = nft_genmask_cur(net), 102 .set = set, 103 .key = elem->key.val.data, 104 }; 105 106 he = rhashtable_lookup(&priv->ht, &arg, nft_rhash_params); 107 if (he != NULL) 108 return he; 109 110 return ERR_PTR(-ENOENT); 111 } 112 113 static bool nft_rhash_update(struct nft_set *set, const u32 *key, 114 void *(*new)(struct nft_set *, 115 const struct nft_expr *, 116 struct nft_regs *regs), 117 const struct nft_expr *expr, 118 struct nft_regs *regs, 119 const struct nft_set_ext **ext) 120 { 121 struct nft_rhash *priv = nft_set_priv(set); 122 struct nft_rhash_elem *he, *prev; 123 struct nft_rhash_cmp_arg arg = { 124 .genmask = NFT_GENMASK_ANY, 125 .set = set, 126 .key = key, 127 }; 128 129 he = rhashtable_lookup(&priv->ht, &arg, nft_rhash_params); 130 if (he != NULL) 131 goto out; 132 133 he = new(set, expr, regs); 134 if (he == NULL) 135 goto err1; 136 137 prev = rhashtable_lookup_get_insert_key(&priv->ht, &arg, &he->node, 138 nft_rhash_params); 139 if (IS_ERR(prev)) 140 goto err2; 141 142 /* Another cpu may race to insert the element with the same key */ 143 if (prev) { 144 nft_set_elem_destroy(set, he, true); 145 he = prev; 146 } 147 148 out: 149 *ext = &he->ext; 150 return true; 151 152 err2: 153 nft_set_elem_destroy(set, he, true); 154 err1: 155 return false; 156 } 157 158 static int nft_rhash_insert(const struct net *net, const struct nft_set *set, 159 const struct nft_set_elem *elem, 160 struct nft_set_ext **ext) 161 { 162 struct nft_rhash *priv = nft_set_priv(set); 163 struct nft_rhash_elem *he = elem->priv; 164 struct nft_rhash_cmp_arg arg = { 165 .genmask = nft_genmask_next(net), 166 .set = set, 167 .key = elem->key.val.data, 168 }; 169 struct nft_rhash_elem *prev; 170 171 prev = rhashtable_lookup_get_insert_key(&priv->ht, &arg, &he->node, 172 nft_rhash_params); 173 if (IS_ERR(prev)) 174 return PTR_ERR(prev); 175 if (prev) { 176 *ext = &prev->ext; 177 return -EEXIST; 178 } 179 return 0; 180 } 181 182 static void nft_rhash_activate(const struct net *net, const struct nft_set *set, 183 const struct nft_set_elem *elem) 184 { 185 struct nft_rhash_elem *he = elem->priv; 186 187 nft_set_elem_change_active(net, set, &he->ext); 188 nft_set_elem_clear_busy(&he->ext); 189 } 190 191 static bool nft_rhash_flush(const struct net *net, 192 const struct nft_set *set, void *priv) 193 { 194 struct nft_rhash_elem *he = priv; 195 196 if (!nft_set_elem_mark_busy(&he->ext) || 197 !nft_is_active(net, &he->ext)) { 198 nft_set_elem_change_active(net, set, &he->ext); 199 return true; 200 } 201 return false; 202 } 203 204 static void *nft_rhash_deactivate(const struct net *net, 205 const struct nft_set *set, 206 const struct nft_set_elem *elem) 207 { 208 struct nft_rhash *priv = nft_set_priv(set); 209 struct nft_rhash_elem *he; 210 struct nft_rhash_cmp_arg arg = { 211 .genmask = nft_genmask_next(net), 212 .set = set, 213 .key = elem->key.val.data, 214 }; 215 216 rcu_read_lock(); 217 he = rhashtable_lookup(&priv->ht, &arg, nft_rhash_params); 218 if (he != NULL && 219 !nft_rhash_flush(net, set, he)) 220 he = NULL; 221 222 rcu_read_unlock(); 223 224 return he; 225 } 226 227 static void nft_rhash_remove(const struct net *net, 228 const struct nft_set *set, 229 const struct nft_set_elem *elem) 230 { 231 struct nft_rhash *priv = nft_set_priv(set); 232 struct nft_rhash_elem *he = elem->priv; 233 234 rhashtable_remove_fast(&priv->ht, &he->node, nft_rhash_params); 235 } 236 237 static bool nft_rhash_delete(const struct nft_set *set, 238 const u32 *key) 239 { 240 struct nft_rhash *priv = nft_set_priv(set); 241 struct nft_rhash_cmp_arg arg = { 242 .genmask = NFT_GENMASK_ANY, 243 .set = set, 244 .key = key, 245 }; 246 struct nft_rhash_elem *he; 247 248 he = rhashtable_lookup(&priv->ht, &arg, nft_rhash_params); 249 if (he == NULL) 250 return false; 251 252 return rhashtable_remove_fast(&priv->ht, &he->node, nft_rhash_params) == 0; 253 } 254 255 static void nft_rhash_walk(const struct nft_ctx *ctx, struct nft_set *set, 256 struct nft_set_iter *iter) 257 { 258 struct nft_rhash *priv = nft_set_priv(set); 259 struct nft_rhash_elem *he; 260 struct rhashtable_iter hti; 261 struct nft_set_elem elem; 262 263 rhashtable_walk_enter(&priv->ht, &hti); 264 rhashtable_walk_start(&hti); 265 266 while ((he = rhashtable_walk_next(&hti))) { 267 if (IS_ERR(he)) { 268 if (PTR_ERR(he) != -EAGAIN) { 269 iter->err = PTR_ERR(he); 270 break; 271 } 272 273 continue; 274 } 275 276 if (iter->count < iter->skip) 277 goto cont; 278 if (nft_set_elem_expired(&he->ext)) 279 goto cont; 280 if (!nft_set_elem_active(&he->ext, iter->genmask)) 281 goto cont; 282 283 elem.priv = he; 284 285 iter->err = iter->fn(ctx, set, iter, &elem); 286 if (iter->err < 0) 287 break; 288 289 cont: 290 iter->count++; 291 } 292 rhashtable_walk_stop(&hti); 293 rhashtable_walk_exit(&hti); 294 } 295 296 static bool nft_rhash_expr_needs_gc_run(const struct nft_set *set, 297 struct nft_set_ext *ext) 298 { 299 struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext); 300 struct nft_expr *expr; 301 u32 size; 302 303 nft_setelem_expr_foreach(expr, elem_expr, size) { 304 if (expr->ops->gc && 305 expr->ops->gc(read_pnet(&set->net), expr)) 306 return true; 307 } 308 309 return false; 310 } 311 312 static void nft_rhash_gc(struct work_struct *work) 313 { 314 struct nft_set *set; 315 struct nft_rhash_elem *he; 316 struct nft_rhash *priv; 317 struct nft_set_gc_batch *gcb = NULL; 318 struct rhashtable_iter hti; 319 320 priv = container_of(work, struct nft_rhash, gc_work.work); 321 set = nft_set_container_of(priv); 322 323 rhashtable_walk_enter(&priv->ht, &hti); 324 rhashtable_walk_start(&hti); 325 326 while ((he = rhashtable_walk_next(&hti))) { 327 if (IS_ERR(he)) { 328 if (PTR_ERR(he) != -EAGAIN) 329 break; 330 continue; 331 } 332 333 if (nft_set_ext_exists(&he->ext, NFT_SET_EXT_EXPRESSIONS) && 334 nft_rhash_expr_needs_gc_run(set, &he->ext)) 335 goto needs_gc_run; 336 337 if (!nft_set_elem_expired(&he->ext)) 338 continue; 339 needs_gc_run: 340 if (nft_set_elem_mark_busy(&he->ext)) 341 continue; 342 343 gcb = nft_set_gc_batch_check(set, gcb, GFP_ATOMIC); 344 if (gcb == NULL) 345 break; 346 rhashtable_remove_fast(&priv->ht, &he->node, nft_rhash_params); 347 atomic_dec(&set->nelems); 348 nft_set_gc_batch_add(gcb, he); 349 } 350 rhashtable_walk_stop(&hti); 351 rhashtable_walk_exit(&hti); 352 353 nft_set_gc_batch_complete(gcb); 354 queue_delayed_work(system_power_efficient_wq, &priv->gc_work, 355 nft_set_gc_interval(set)); 356 } 357 358 static u64 nft_rhash_privsize(const struct nlattr * const nla[], 359 const struct nft_set_desc *desc) 360 { 361 return sizeof(struct nft_rhash); 362 } 363 364 static void nft_rhash_gc_init(const struct nft_set *set) 365 { 366 struct nft_rhash *priv = nft_set_priv(set); 367 368 queue_delayed_work(system_power_efficient_wq, &priv->gc_work, 369 nft_set_gc_interval(set)); 370 } 371 372 static int nft_rhash_init(const struct nft_set *set, 373 const struct nft_set_desc *desc, 374 const struct nlattr * const tb[]) 375 { 376 struct nft_rhash *priv = nft_set_priv(set); 377 struct rhashtable_params params = nft_rhash_params; 378 int err; 379 380 params.nelem_hint = desc->size ?: NFT_RHASH_ELEMENT_HINT; 381 params.key_len = set->klen; 382 383 err = rhashtable_init(&priv->ht, ¶ms); 384 if (err < 0) 385 return err; 386 387 INIT_DEFERRABLE_WORK(&priv->gc_work, nft_rhash_gc); 388 if (set->flags & NFT_SET_TIMEOUT) 389 nft_rhash_gc_init(set); 390 391 return 0; 392 } 393 394 static void nft_rhash_elem_destroy(void *ptr, void *arg) 395 { 396 nft_set_elem_destroy(arg, ptr, true); 397 } 398 399 static void nft_rhash_destroy(const struct nft_set *set) 400 { 401 struct nft_rhash *priv = nft_set_priv(set); 402 403 cancel_delayed_work_sync(&priv->gc_work); 404 rcu_barrier(); 405 rhashtable_free_and_destroy(&priv->ht, nft_rhash_elem_destroy, 406 (void *)set); 407 } 408 409 static u32 nft_hash_buckets(u32 size) 410 { 411 return roundup_pow_of_two(size * 4 / 3); 412 } 413 414 static bool nft_rhash_estimate(const struct nft_set_desc *desc, u32 features, 415 struct nft_set_estimate *est) 416 { 417 est->size = ~0; 418 est->lookup = NFT_SET_CLASS_O_1; 419 est->space = NFT_SET_CLASS_O_N; 420 421 return true; 422 } 423 424 struct nft_hash { 425 u32 seed; 426 u32 buckets; 427 struct hlist_head table[]; 428 }; 429 430 struct nft_hash_elem { 431 struct hlist_node node; 432 struct nft_set_ext ext; 433 }; 434 435 static bool nft_hash_lookup(const struct net *net, const struct nft_set *set, 436 const u32 *key, const struct nft_set_ext **ext) 437 { 438 struct nft_hash *priv = nft_set_priv(set); 439 u8 genmask = nft_genmask_cur(net); 440 const struct nft_hash_elem *he; 441 u32 hash; 442 443 hash = jhash(key, set->klen, priv->seed); 444 hash = reciprocal_scale(hash, priv->buckets); 445 hlist_for_each_entry_rcu(he, &priv->table[hash], node) { 446 if (!memcmp(nft_set_ext_key(&he->ext), key, set->klen) && 447 nft_set_elem_active(&he->ext, genmask)) { 448 *ext = &he->ext; 449 return true; 450 } 451 } 452 return false; 453 } 454 455 static void *nft_hash_get(const struct net *net, const struct nft_set *set, 456 const struct nft_set_elem *elem, unsigned int flags) 457 { 458 struct nft_hash *priv = nft_set_priv(set); 459 u8 genmask = nft_genmask_cur(net); 460 struct nft_hash_elem *he; 461 u32 hash; 462 463 hash = jhash(elem->key.val.data, set->klen, priv->seed); 464 hash = reciprocal_scale(hash, priv->buckets); 465 hlist_for_each_entry_rcu(he, &priv->table[hash], node) { 466 if (!memcmp(nft_set_ext_key(&he->ext), elem->key.val.data, set->klen) && 467 nft_set_elem_active(&he->ext, genmask)) 468 return he; 469 } 470 return ERR_PTR(-ENOENT); 471 } 472 473 static bool nft_hash_lookup_fast(const struct net *net, 474 const struct nft_set *set, 475 const u32 *key, const struct nft_set_ext **ext) 476 { 477 struct nft_hash *priv = nft_set_priv(set); 478 u8 genmask = nft_genmask_cur(net); 479 const struct nft_hash_elem *he; 480 u32 hash, k1, k2; 481 482 k1 = *key; 483 hash = jhash_1word(k1, priv->seed); 484 hash = reciprocal_scale(hash, priv->buckets); 485 hlist_for_each_entry_rcu(he, &priv->table[hash], node) { 486 k2 = *(u32 *)nft_set_ext_key(&he->ext)->data; 487 if (k1 == k2 && 488 nft_set_elem_active(&he->ext, genmask)) { 489 *ext = &he->ext; 490 return true; 491 } 492 } 493 return false; 494 } 495 496 static u32 nft_jhash(const struct nft_set *set, const struct nft_hash *priv, 497 const struct nft_set_ext *ext) 498 { 499 const struct nft_data *key = nft_set_ext_key(ext); 500 u32 hash, k1; 501 502 if (set->klen == 4) { 503 k1 = *(u32 *)key; 504 hash = jhash_1word(k1, priv->seed); 505 } else { 506 hash = jhash(key, set->klen, priv->seed); 507 } 508 hash = reciprocal_scale(hash, priv->buckets); 509 510 return hash; 511 } 512 513 static int nft_hash_insert(const struct net *net, const struct nft_set *set, 514 const struct nft_set_elem *elem, 515 struct nft_set_ext **ext) 516 { 517 struct nft_hash_elem *this = elem->priv, *he; 518 struct nft_hash *priv = nft_set_priv(set); 519 u8 genmask = nft_genmask_next(net); 520 u32 hash; 521 522 hash = nft_jhash(set, priv, &this->ext); 523 hlist_for_each_entry(he, &priv->table[hash], node) { 524 if (!memcmp(nft_set_ext_key(&this->ext), 525 nft_set_ext_key(&he->ext), set->klen) && 526 nft_set_elem_active(&he->ext, genmask)) { 527 *ext = &he->ext; 528 return -EEXIST; 529 } 530 } 531 hlist_add_head_rcu(&this->node, &priv->table[hash]); 532 return 0; 533 } 534 535 static void nft_hash_activate(const struct net *net, const struct nft_set *set, 536 const struct nft_set_elem *elem) 537 { 538 struct nft_hash_elem *he = elem->priv; 539 540 nft_set_elem_change_active(net, set, &he->ext); 541 } 542 543 static bool nft_hash_flush(const struct net *net, 544 const struct nft_set *set, void *priv) 545 { 546 struct nft_hash_elem *he = priv; 547 548 nft_set_elem_change_active(net, set, &he->ext); 549 return true; 550 } 551 552 static void *nft_hash_deactivate(const struct net *net, 553 const struct nft_set *set, 554 const struct nft_set_elem *elem) 555 { 556 struct nft_hash *priv = nft_set_priv(set); 557 struct nft_hash_elem *this = elem->priv, *he; 558 u8 genmask = nft_genmask_next(net); 559 u32 hash; 560 561 hash = nft_jhash(set, priv, &this->ext); 562 hlist_for_each_entry(he, &priv->table[hash], node) { 563 if (!memcmp(nft_set_ext_key(&he->ext), &elem->key.val, 564 set->klen) && 565 nft_set_elem_active(&he->ext, genmask)) { 566 nft_set_elem_change_active(net, set, &he->ext); 567 return he; 568 } 569 } 570 return NULL; 571 } 572 573 static void nft_hash_remove(const struct net *net, 574 const struct nft_set *set, 575 const struct nft_set_elem *elem) 576 { 577 struct nft_hash_elem *he = elem->priv; 578 579 hlist_del_rcu(&he->node); 580 } 581 582 static void nft_hash_walk(const struct nft_ctx *ctx, struct nft_set *set, 583 struct nft_set_iter *iter) 584 { 585 struct nft_hash *priv = nft_set_priv(set); 586 struct nft_hash_elem *he; 587 struct nft_set_elem elem; 588 int i; 589 590 for (i = 0; i < priv->buckets; i++) { 591 hlist_for_each_entry_rcu(he, &priv->table[i], node) { 592 if (iter->count < iter->skip) 593 goto cont; 594 if (!nft_set_elem_active(&he->ext, iter->genmask)) 595 goto cont; 596 597 elem.priv = he; 598 599 iter->err = iter->fn(ctx, set, iter, &elem); 600 if (iter->err < 0) 601 return; 602 cont: 603 iter->count++; 604 } 605 } 606 } 607 608 static u64 nft_hash_privsize(const struct nlattr * const nla[], 609 const struct nft_set_desc *desc) 610 { 611 return sizeof(struct nft_hash) + 612 nft_hash_buckets(desc->size) * sizeof(struct hlist_head); 613 } 614 615 static int nft_hash_init(const struct nft_set *set, 616 const struct nft_set_desc *desc, 617 const struct nlattr * const tb[]) 618 { 619 struct nft_hash *priv = nft_set_priv(set); 620 621 priv->buckets = nft_hash_buckets(desc->size); 622 get_random_bytes(&priv->seed, sizeof(priv->seed)); 623 624 return 0; 625 } 626 627 static void nft_hash_destroy(const struct nft_set *set) 628 { 629 struct nft_hash *priv = nft_set_priv(set); 630 struct nft_hash_elem *he; 631 struct hlist_node *next; 632 int i; 633 634 for (i = 0; i < priv->buckets; i++) { 635 hlist_for_each_entry_safe(he, next, &priv->table[i], node) { 636 hlist_del_rcu(&he->node); 637 nft_set_elem_destroy(set, he, true); 638 } 639 } 640 } 641 642 static bool nft_hash_estimate(const struct nft_set_desc *desc, u32 features, 643 struct nft_set_estimate *est) 644 { 645 if (!desc->size) 646 return false; 647 648 if (desc->klen == 4) 649 return false; 650 651 est->size = sizeof(struct nft_hash) + 652 nft_hash_buckets(desc->size) * sizeof(struct hlist_head) + 653 desc->size * sizeof(struct nft_hash_elem); 654 est->lookup = NFT_SET_CLASS_O_1; 655 est->space = NFT_SET_CLASS_O_N; 656 657 return true; 658 } 659 660 static bool nft_hash_fast_estimate(const struct nft_set_desc *desc, u32 features, 661 struct nft_set_estimate *est) 662 { 663 if (!desc->size) 664 return false; 665 666 if (desc->klen != 4) 667 return false; 668 669 est->size = sizeof(struct nft_hash) + 670 nft_hash_buckets(desc->size) * sizeof(struct hlist_head) + 671 desc->size * sizeof(struct nft_hash_elem); 672 est->lookup = NFT_SET_CLASS_O_1; 673 est->space = NFT_SET_CLASS_O_N; 674 675 return true; 676 } 677 678 const struct nft_set_type nft_set_rhash_type = { 679 .features = NFT_SET_MAP | NFT_SET_OBJECT | 680 NFT_SET_TIMEOUT | NFT_SET_EVAL, 681 .ops = { 682 .privsize = nft_rhash_privsize, 683 .elemsize = offsetof(struct nft_rhash_elem, ext), 684 .estimate = nft_rhash_estimate, 685 .init = nft_rhash_init, 686 .gc_init = nft_rhash_gc_init, 687 .destroy = nft_rhash_destroy, 688 .insert = nft_rhash_insert, 689 .activate = nft_rhash_activate, 690 .deactivate = nft_rhash_deactivate, 691 .flush = nft_rhash_flush, 692 .remove = nft_rhash_remove, 693 .lookup = nft_rhash_lookup, 694 .update = nft_rhash_update, 695 .delete = nft_rhash_delete, 696 .walk = nft_rhash_walk, 697 .get = nft_rhash_get, 698 }, 699 }; 700 701 const struct nft_set_type nft_set_hash_type = { 702 .features = NFT_SET_MAP | NFT_SET_OBJECT, 703 .ops = { 704 .privsize = nft_hash_privsize, 705 .elemsize = offsetof(struct nft_hash_elem, ext), 706 .estimate = nft_hash_estimate, 707 .init = nft_hash_init, 708 .destroy = nft_hash_destroy, 709 .insert = nft_hash_insert, 710 .activate = nft_hash_activate, 711 .deactivate = nft_hash_deactivate, 712 .flush = nft_hash_flush, 713 .remove = nft_hash_remove, 714 .lookup = nft_hash_lookup, 715 .walk = nft_hash_walk, 716 .get = nft_hash_get, 717 }, 718 }; 719 720 const struct nft_set_type nft_set_hash_fast_type = { 721 .features = NFT_SET_MAP | NFT_SET_OBJECT, 722 .ops = { 723 .privsize = nft_hash_privsize, 724 .elemsize = offsetof(struct nft_hash_elem, ext), 725 .estimate = nft_hash_fast_estimate, 726 .init = nft_hash_init, 727 .destroy = nft_hash_destroy, 728 .insert = nft_hash_insert, 729 .activate = nft_hash_activate, 730 .deactivate = nft_hash_deactivate, 731 .flush = nft_hash_flush, 732 .remove = nft_hash_remove, 733 .lookup = nft_hash_lookup_fast, 734 .walk = nft_hash_walk, 735 .get = nft_hash_get, 736 }, 737 }; 738