xref: /linux/net/netfilter/nft_set_hash.c (revision 908fc4c2) 
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 INDIRECT_CALLABLE_SCOPE
78 bool nft_rhash_lookup(const struct net *net, const struct nft_set *set,
79 		      const u32 *key, const struct nft_set_ext **ext)
80 {
81 	struct nft_rhash *priv = nft_set_priv(set);
82 	const struct nft_rhash_elem *he;
83 	struct nft_rhash_cmp_arg arg = {
84 		.genmask = nft_genmask_cur(net),
85 		.set	 = set,
86 		.key	 = key,
87 	};
88 
89 	he = rhashtable_lookup(&priv->ht, &arg, nft_rhash_params);
90 	if (he != NULL)
91 		*ext = &he->ext;
92 
93 	return !!he;
94 }
95 
96 static void *nft_rhash_get(const struct net *net, const struct nft_set *set,
97 			   const struct nft_set_elem *elem, unsigned int flags)
98 {
99 	struct nft_rhash *priv = nft_set_priv(set);
100 	struct nft_rhash_elem *he;
101 	struct nft_rhash_cmp_arg arg = {
102 		.genmask = nft_genmask_cur(net),
103 		.set	 = set,
104 		.key	 = elem->key.val.data,
105 	};
106 
107 	he = rhashtable_lookup(&priv->ht, &arg, nft_rhash_params);
108 	if (he != NULL)
109 		return he;
110 
111 	return ERR_PTR(-ENOENT);
112 }
113 
114 static bool nft_rhash_update(struct nft_set *set, const u32 *key,
115 			     void *(*new)(struct nft_set *,
116 					  const struct nft_expr *,
117 					  struct nft_regs *regs),
118 			     const struct nft_expr *expr,
119 			     struct nft_regs *regs,
120 			     const struct nft_set_ext **ext)
121 {
122 	struct nft_rhash *priv = nft_set_priv(set);
123 	struct nft_rhash_elem *he, *prev;
124 	struct nft_rhash_cmp_arg arg = {
125 		.genmask = NFT_GENMASK_ANY,
126 		.set	 = set,
127 		.key	 = key,
128 	};
129 
130 	he = rhashtable_lookup(&priv->ht, &arg, nft_rhash_params);
131 	if (he != NULL)
132 		goto out;
133 
134 	he = new(set, expr, regs);
135 	if (he == NULL)
136 		goto err1;
137 
138 	prev = rhashtable_lookup_get_insert_key(&priv->ht, &arg, &he->node,
139 						nft_rhash_params);
140 	if (IS_ERR(prev))
141 		goto err2;
142 
143 	/* Another cpu may race to insert the element with the same key */
144 	if (prev) {
145 		nft_set_elem_destroy(set, he, true);
146 		atomic_dec(&set->nelems);
147 		he = prev;
148 	}
149 
150 out:
151 	*ext = &he->ext;
152 	return true;
153 
154 err2:
155 	nft_set_elem_destroy(set, he, true);
156 	atomic_dec(&set->nelems);
157 err1:
158 	return false;
159 }
160 
161 static int nft_rhash_insert(const struct net *net, const struct nft_set *set,
162 			    const struct nft_set_elem *elem,
163 			    struct nft_set_ext **ext)
164 {
165 	struct nft_rhash *priv = nft_set_priv(set);
166 	struct nft_rhash_elem *he = elem->priv;
167 	struct nft_rhash_cmp_arg arg = {
168 		.genmask = nft_genmask_next(net),
169 		.set	 = set,
170 		.key	 = elem->key.val.data,
171 	};
172 	struct nft_rhash_elem *prev;
173 
174 	prev = rhashtable_lookup_get_insert_key(&priv->ht, &arg, &he->node,
175 						nft_rhash_params);
176 	if (IS_ERR(prev))
177 		return PTR_ERR(prev);
178 	if (prev) {
179 		*ext = &prev->ext;
180 		return -EEXIST;
181 	}
182 	return 0;
183 }
184 
185 static void nft_rhash_activate(const struct net *net, const struct nft_set *set,
186 			       const struct nft_set_elem *elem)
187 {
188 	struct nft_rhash_elem *he = elem->priv;
189 
190 	nft_set_elem_change_active(net, set, &he->ext);
191 	nft_set_elem_clear_busy(&he->ext);
192 }
193 
194 static bool nft_rhash_flush(const struct net *net,
195 			    const struct nft_set *set, void *priv)
196 {
197 	struct nft_rhash_elem *he = priv;
198 
199 	if (!nft_set_elem_mark_busy(&he->ext) ||
200 	    !nft_is_active(net, &he->ext)) {
201 		nft_set_elem_change_active(net, set, &he->ext);
202 		return true;
203 	}
204 	return false;
205 }
206 
207 static void *nft_rhash_deactivate(const struct net *net,
208 				  const struct nft_set *set,
209 				  const struct nft_set_elem *elem)
210 {
211 	struct nft_rhash *priv = nft_set_priv(set);
212 	struct nft_rhash_elem *he;
213 	struct nft_rhash_cmp_arg arg = {
214 		.genmask = nft_genmask_next(net),
215 		.set	 = set,
216 		.key	 = elem->key.val.data,
217 	};
218 
219 	rcu_read_lock();
220 	he = rhashtable_lookup(&priv->ht, &arg, nft_rhash_params);
221 	if (he != NULL &&
222 	    !nft_rhash_flush(net, set, he))
223 		he = NULL;
224 
225 	rcu_read_unlock();
226 
227 	return he;
228 }
229 
230 static void nft_rhash_remove(const struct net *net,
231 			     const struct nft_set *set,
232 			     const struct nft_set_elem *elem)
233 {
234 	struct nft_rhash *priv = nft_set_priv(set);
235 	struct nft_rhash_elem *he = elem->priv;
236 
237 	rhashtable_remove_fast(&priv->ht, &he->node, nft_rhash_params);
238 }
239 
240 static bool nft_rhash_delete(const struct nft_set *set,
241 			     const u32 *key)
242 {
243 	struct nft_rhash *priv = nft_set_priv(set);
244 	struct nft_rhash_cmp_arg arg = {
245 		.genmask = NFT_GENMASK_ANY,
246 		.set = set,
247 		.key = key,
248 	};
249 	struct nft_rhash_elem *he;
250 
251 	he = rhashtable_lookup(&priv->ht, &arg, nft_rhash_params);
252 	if (he == NULL)
253 		return false;
254 
255 	return rhashtable_remove_fast(&priv->ht, &he->node, nft_rhash_params) == 0;
256 }
257 
258 static void nft_rhash_walk(const struct nft_ctx *ctx, struct nft_set *set,
259 			   struct nft_set_iter *iter)
260 {
261 	struct nft_rhash *priv = nft_set_priv(set);
262 	struct nft_rhash_elem *he;
263 	struct rhashtable_iter hti;
264 	struct nft_set_elem elem;
265 
266 	rhashtable_walk_enter(&priv->ht, &hti);
267 	rhashtable_walk_start(&hti);
268 
269 	while ((he = rhashtable_walk_next(&hti))) {
270 		if (IS_ERR(he)) {
271 			if (PTR_ERR(he) != -EAGAIN) {
272 				iter->err = PTR_ERR(he);
273 				break;
274 			}
275 
276 			continue;
277 		}
278 
279 		if (iter->count < iter->skip)
280 			goto cont;
281 		if (nft_set_elem_expired(&he->ext))
282 			goto cont;
283 		if (!nft_set_elem_active(&he->ext, iter->genmask))
284 			goto cont;
285 
286 		elem.priv = he;
287 
288 		iter->err = iter->fn(ctx, set, iter, &elem);
289 		if (iter->err < 0)
290 			break;
291 
292 cont:
293 		iter->count++;
294 	}
295 	rhashtable_walk_stop(&hti);
296 	rhashtable_walk_exit(&hti);
297 }
298 
299 static bool nft_rhash_expr_needs_gc_run(const struct nft_set *set,
300 					struct nft_set_ext *ext)
301 {
302 	struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
303 	struct nft_expr *expr;
304 	u32 size;
305 
306 	nft_setelem_expr_foreach(expr, elem_expr, size) {
307 		if (expr->ops->gc &&
308 		    expr->ops->gc(read_pnet(&set->net), expr))
309 			return true;
310 	}
311 
312 	return false;
313 }
314 
315 static void nft_rhash_gc(struct work_struct *work)
316 {
317 	struct nft_set *set;
318 	struct nft_rhash_elem *he;
319 	struct nft_rhash *priv;
320 	struct nft_set_gc_batch *gcb = NULL;
321 	struct rhashtable_iter hti;
322 
323 	priv = container_of(work, struct nft_rhash, gc_work.work);
324 	set  = nft_set_container_of(priv);
325 
326 	rhashtable_walk_enter(&priv->ht, &hti);
327 	rhashtable_walk_start(&hti);
328 
329 	while ((he = rhashtable_walk_next(&hti))) {
330 		if (IS_ERR(he)) {
331 			if (PTR_ERR(he) != -EAGAIN)
332 				break;
333 			continue;
334 		}
335 
336 		if (nft_set_ext_exists(&he->ext, NFT_SET_EXT_EXPRESSIONS) &&
337 		    nft_rhash_expr_needs_gc_run(set, &he->ext))
338 			goto needs_gc_run;
339 
340 		if (!nft_set_elem_expired(&he->ext))
341 			continue;
342 needs_gc_run:
343 		if (nft_set_elem_mark_busy(&he->ext))
344 			continue;
345 
346 		gcb = nft_set_gc_batch_check(set, gcb, GFP_ATOMIC);
347 		if (gcb == NULL)
348 			break;
349 		rhashtable_remove_fast(&priv->ht, &he->node, nft_rhash_params);
350 		atomic_dec(&set->nelems);
351 		nft_set_gc_batch_add(gcb, he);
352 	}
353 	rhashtable_walk_stop(&hti);
354 	rhashtable_walk_exit(&hti);
355 
356 	he = nft_set_catchall_gc(set);
357 	if (he) {
358 		gcb = nft_set_gc_batch_check(set, gcb, GFP_ATOMIC);
359 		if (gcb)
360 			nft_set_gc_batch_add(gcb, he);
361 	}
362 	nft_set_gc_batch_complete(gcb);
363 	queue_delayed_work(system_power_efficient_wq, &priv->gc_work,
364 			   nft_set_gc_interval(set));
365 }
366 
367 static u64 nft_rhash_privsize(const struct nlattr * const nla[],
368 			      const struct nft_set_desc *desc)
369 {
370 	return sizeof(struct nft_rhash);
371 }
372 
373 static void nft_rhash_gc_init(const struct nft_set *set)
374 {
375 	struct nft_rhash *priv = nft_set_priv(set);
376 
377 	queue_delayed_work(system_power_efficient_wq, &priv->gc_work,
378 			   nft_set_gc_interval(set));
379 }
380 
381 static int nft_rhash_init(const struct nft_set *set,
382 			  const struct nft_set_desc *desc,
383 			  const struct nlattr * const tb[])
384 {
385 	struct nft_rhash *priv = nft_set_priv(set);
386 	struct rhashtable_params params = nft_rhash_params;
387 	int err;
388 
389 	params.nelem_hint = desc->size ?: NFT_RHASH_ELEMENT_HINT;
390 	params.key_len	  = set->klen;
391 
392 	err = rhashtable_init(&priv->ht, &params);
393 	if (err < 0)
394 		return err;
395 
396 	INIT_DEFERRABLE_WORK(&priv->gc_work, nft_rhash_gc);
397 	if (set->flags & NFT_SET_TIMEOUT)
398 		nft_rhash_gc_init(set);
399 
400 	return 0;
401 }
402 
403 static void nft_rhash_elem_destroy(void *ptr, void *arg)
404 {
405 	nft_set_elem_destroy(arg, ptr, true);
406 }
407 
408 static void nft_rhash_destroy(const struct nft_set *set)
409 {
410 	struct nft_rhash *priv = nft_set_priv(set);
411 
412 	cancel_delayed_work_sync(&priv->gc_work);
413 	rcu_barrier();
414 	rhashtable_free_and_destroy(&priv->ht, nft_rhash_elem_destroy,
415 				    (void *)set);
416 }
417 
418 /* Number of buckets is stored in u32, so cap our result to 1U<<31 */
419 #define NFT_MAX_BUCKETS (1U << 31)
420 
421 static u32 nft_hash_buckets(u32 size)
422 {
423 	u64 val = div_u64((u64)size * 4, 3);
424 
425 	if (val >= NFT_MAX_BUCKETS)
426 		return NFT_MAX_BUCKETS;
427 
428 	return roundup_pow_of_two(val);
429 }
430 
431 static bool nft_rhash_estimate(const struct nft_set_desc *desc, u32 features,
432 			       struct nft_set_estimate *est)
433 {
434 	est->size   = ~0;
435 	est->lookup = NFT_SET_CLASS_O_1;
436 	est->space  = NFT_SET_CLASS_O_N;
437 
438 	return true;
439 }
440 
441 struct nft_hash {
442 	u32				seed;
443 	u32				buckets;
444 	struct hlist_head		table[];
445 };
446 
447 struct nft_hash_elem {
448 	struct hlist_node		node;
449 	struct nft_set_ext		ext;
450 };
451 
452 INDIRECT_CALLABLE_SCOPE
453 bool nft_hash_lookup(const struct net *net, const struct nft_set *set,
454 		     const u32 *key, const struct nft_set_ext **ext)
455 {
456 	struct nft_hash *priv = nft_set_priv(set);
457 	u8 genmask = nft_genmask_cur(net);
458 	const struct nft_hash_elem *he;
459 	u32 hash;
460 
461 	hash = jhash(key, set->klen, priv->seed);
462 	hash = reciprocal_scale(hash, priv->buckets);
463 	hlist_for_each_entry_rcu(he, &priv->table[hash], node) {
464 		if (!memcmp(nft_set_ext_key(&he->ext), key, set->klen) &&
465 		    nft_set_elem_active(&he->ext, genmask)) {
466 			*ext = &he->ext;
467 			return true;
468 		}
469 	}
470 	return false;
471 }
472 
473 static void *nft_hash_get(const struct net *net, const struct nft_set *set,
474 			  const struct nft_set_elem *elem, unsigned int flags)
475 {
476 	struct nft_hash *priv = nft_set_priv(set);
477 	u8 genmask = nft_genmask_cur(net);
478 	struct nft_hash_elem *he;
479 	u32 hash;
480 
481 	hash = jhash(elem->key.val.data, set->klen, priv->seed);
482 	hash = reciprocal_scale(hash, priv->buckets);
483 	hlist_for_each_entry_rcu(he, &priv->table[hash], node) {
484 		if (!memcmp(nft_set_ext_key(&he->ext), elem->key.val.data, set->klen) &&
485 		    nft_set_elem_active(&he->ext, genmask))
486 			return he;
487 	}
488 	return ERR_PTR(-ENOENT);
489 }
490 
491 INDIRECT_CALLABLE_SCOPE
492 bool nft_hash_lookup_fast(const struct net *net,
493 			  const struct nft_set *set,
494 			  const u32 *key, const struct nft_set_ext **ext)
495 {
496 	struct nft_hash *priv = nft_set_priv(set);
497 	u8 genmask = nft_genmask_cur(net);
498 	const struct nft_hash_elem *he;
499 	u32 hash, k1, k2;
500 
501 	k1 = *key;
502 	hash = jhash_1word(k1, priv->seed);
503 	hash = reciprocal_scale(hash, priv->buckets);
504 	hlist_for_each_entry_rcu(he, &priv->table[hash], node) {
505 		k2 = *(u32 *)nft_set_ext_key(&he->ext)->data;
506 		if (k1 == k2 &&
507 		    nft_set_elem_active(&he->ext, genmask)) {
508 			*ext = &he->ext;
509 			return true;
510 		}
511 	}
512 	return false;
513 }
514 
515 static u32 nft_jhash(const struct nft_set *set, const struct nft_hash *priv,
516 		     const struct nft_set_ext *ext)
517 {
518 	const struct nft_data *key = nft_set_ext_key(ext);
519 	u32 hash, k1;
520 
521 	if (set->klen == 4) {
522 		k1 = *(u32 *)key;
523 		hash = jhash_1word(k1, priv->seed);
524 	} else {
525 		hash = jhash(key, set->klen, priv->seed);
526 	}
527 	hash = reciprocal_scale(hash, priv->buckets);
528 
529 	return hash;
530 }
531 
532 static int nft_hash_insert(const struct net *net, const struct nft_set *set,
533 			   const struct nft_set_elem *elem,
534 			   struct nft_set_ext **ext)
535 {
536 	struct nft_hash_elem *this = elem->priv, *he;
537 	struct nft_hash *priv = nft_set_priv(set);
538 	u8 genmask = nft_genmask_next(net);
539 	u32 hash;
540 
541 	hash = nft_jhash(set, priv, &this->ext);
542 	hlist_for_each_entry(he, &priv->table[hash], node) {
543 		if (!memcmp(nft_set_ext_key(&this->ext),
544 			    nft_set_ext_key(&he->ext), set->klen) &&
545 		    nft_set_elem_active(&he->ext, genmask)) {
546 			*ext = &he->ext;
547 			return -EEXIST;
548 		}
549 	}
550 	hlist_add_head_rcu(&this->node, &priv->table[hash]);
551 	return 0;
552 }
553 
554 static void nft_hash_activate(const struct net *net, const struct nft_set *set,
555 			      const struct nft_set_elem *elem)
556 {
557 	struct nft_hash_elem *he = elem->priv;
558 
559 	nft_set_elem_change_active(net, set, &he->ext);
560 }
561 
562 static bool nft_hash_flush(const struct net *net,
563 			   const struct nft_set *set, void *priv)
564 {
565 	struct nft_hash_elem *he = priv;
566 
567 	nft_set_elem_change_active(net, set, &he->ext);
568 	return true;
569 }
570 
571 static void *nft_hash_deactivate(const struct net *net,
572 				 const struct nft_set *set,
573 				 const struct nft_set_elem *elem)
574 {
575 	struct nft_hash *priv = nft_set_priv(set);
576 	struct nft_hash_elem *this = elem->priv, *he;
577 	u8 genmask = nft_genmask_next(net);
578 	u32 hash;
579 
580 	hash = nft_jhash(set, priv, &this->ext);
581 	hlist_for_each_entry(he, &priv->table[hash], node) {
582 		if (!memcmp(nft_set_ext_key(&he->ext), &elem->key.val,
583 			    set->klen) &&
584 		    nft_set_elem_active(&he->ext, genmask)) {
585 			nft_set_elem_change_active(net, set, &he->ext);
586 			return he;
587 		}
588 	}
589 	return NULL;
590 }
591 
592 static void nft_hash_remove(const struct net *net,
593 			    const struct nft_set *set,
594 			    const struct nft_set_elem *elem)
595 {
596 	struct nft_hash_elem *he = elem->priv;
597 
598 	hlist_del_rcu(&he->node);
599 }
600 
601 static void nft_hash_walk(const struct nft_ctx *ctx, struct nft_set *set,
602 			  struct nft_set_iter *iter)
603 {
604 	struct nft_hash *priv = nft_set_priv(set);
605 	struct nft_hash_elem *he;
606 	struct nft_set_elem elem;
607 	int i;
608 
609 	for (i = 0; i < priv->buckets; i++) {
610 		hlist_for_each_entry_rcu(he, &priv->table[i], node) {
611 			if (iter->count < iter->skip)
612 				goto cont;
613 			if (!nft_set_elem_active(&he->ext, iter->genmask))
614 				goto cont;
615 
616 			elem.priv = he;
617 
618 			iter->err = iter->fn(ctx, set, iter, &elem);
619 			if (iter->err < 0)
620 				return;
621 cont:
622 			iter->count++;
623 		}
624 	}
625 }
626 
627 static u64 nft_hash_privsize(const struct nlattr * const nla[],
628 			     const struct nft_set_desc *desc)
629 {
630 	return sizeof(struct nft_hash) +
631 	       (u64)nft_hash_buckets(desc->size) * sizeof(struct hlist_head);
632 }
633 
634 static int nft_hash_init(const struct nft_set *set,
635 			 const struct nft_set_desc *desc,
636 			 const struct nlattr * const tb[])
637 {
638 	struct nft_hash *priv = nft_set_priv(set);
639 
640 	priv->buckets = nft_hash_buckets(desc->size);
641 	get_random_bytes(&priv->seed, sizeof(priv->seed));
642 
643 	return 0;
644 }
645 
646 static void nft_hash_destroy(const struct nft_set *set)
647 {
648 	struct nft_hash *priv = nft_set_priv(set);
649 	struct nft_hash_elem *he;
650 	struct hlist_node *next;
651 	int i;
652 
653 	for (i = 0; i < priv->buckets; i++) {
654 		hlist_for_each_entry_safe(he, next, &priv->table[i], node) {
655 			hlist_del_rcu(&he->node);
656 			nft_set_elem_destroy(set, he, true);
657 		}
658 	}
659 }
660 
661 static bool nft_hash_estimate(const struct nft_set_desc *desc, u32 features,
662 			      struct nft_set_estimate *est)
663 {
664 	if (!desc->size)
665 		return false;
666 
667 	if (desc->klen == 4)
668 		return false;
669 
670 	est->size   = sizeof(struct nft_hash) +
671 		      (u64)nft_hash_buckets(desc->size) * sizeof(struct hlist_head) +
672 		      (u64)desc->size * sizeof(struct nft_hash_elem);
673 	est->lookup = NFT_SET_CLASS_O_1;
674 	est->space  = NFT_SET_CLASS_O_N;
675 
676 	return true;
677 }
678 
679 static bool nft_hash_fast_estimate(const struct nft_set_desc *desc, u32 features,
680 				   struct nft_set_estimate *est)
681 {
682 	if (!desc->size)
683 		return false;
684 
685 	if (desc->klen != 4)
686 		return false;
687 
688 	est->size   = sizeof(struct nft_hash) +
689 		      (u64)nft_hash_buckets(desc->size) * sizeof(struct hlist_head) +
690 		      (u64)desc->size * sizeof(struct nft_hash_elem);
691 	est->lookup = NFT_SET_CLASS_O_1;
692 	est->space  = NFT_SET_CLASS_O_N;
693 
694 	return true;
695 }
696 
697 const struct nft_set_type nft_set_rhash_type = {
698 	.features	= NFT_SET_MAP | NFT_SET_OBJECT |
699 			  NFT_SET_TIMEOUT | NFT_SET_EVAL,
700 	.ops		= {
701 		.privsize       = nft_rhash_privsize,
702 		.elemsize	= offsetof(struct nft_rhash_elem, ext),
703 		.estimate	= nft_rhash_estimate,
704 		.init		= nft_rhash_init,
705 		.gc_init	= nft_rhash_gc_init,
706 		.destroy	= nft_rhash_destroy,
707 		.insert		= nft_rhash_insert,
708 		.activate	= nft_rhash_activate,
709 		.deactivate	= nft_rhash_deactivate,
710 		.flush		= nft_rhash_flush,
711 		.remove		= nft_rhash_remove,
712 		.lookup		= nft_rhash_lookup,
713 		.update		= nft_rhash_update,
714 		.delete		= nft_rhash_delete,
715 		.walk		= nft_rhash_walk,
716 		.get		= nft_rhash_get,
717 	},
718 };
719 
720 const struct nft_set_type nft_set_hash_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_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,
734 		.walk		= nft_hash_walk,
735 		.get		= nft_hash_get,
736 	},
737 };
738 
739 const struct nft_set_type nft_set_hash_fast_type = {
740 	.features	= NFT_SET_MAP | NFT_SET_OBJECT,
741 	.ops		= {
742 		.privsize       = nft_hash_privsize,
743 		.elemsize	= offsetof(struct nft_hash_elem, ext),
744 		.estimate	= nft_hash_fast_estimate,
745 		.init		= nft_hash_init,
746 		.destroy	= nft_hash_destroy,
747 		.insert		= nft_hash_insert,
748 		.activate	= nft_hash_activate,
749 		.deactivate	= nft_hash_deactivate,
750 		.flush		= nft_hash_flush,
751 		.remove		= nft_hash_remove,
752 		.lookup		= nft_hash_lookup_fast,
753 		.walk		= nft_hash_walk,
754 		.get		= nft_hash_get,
755 	},
756 };
757