xref: /linux/net/netfilter/nft_set_hash.c (revision 307797159ac25fe5a2048bf5c6a5718298edca57) 
1 /*
2  * Copyright (c) 2008-2014 Patrick McHardy <kaber@trash.net>
3  *
4  * This program is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License version 2 as
6  * published by the Free Software Foundation.
7  *
8  * Development of this code funded by Astaro AG (http://www.astaro.com/)
9  */
10 
11 #include <linux/kernel.h>
12 #include <linux/init.h>
13 #include <linux/module.h>
14 #include <linux/list.h>
15 #include <linux/log2.h>
16 #include <linux/jhash.h>
17 #include <linux/netlink.h>
18 #include <linux/workqueue.h>
19 #include <linux/rhashtable.h>
20 #include <linux/netfilter.h>
21 #include <linux/netfilter/nf_tables.h>
22 #include <net/netfilter/nf_tables.h>
23 
24 /* We target a hash table size of 4, element hint is 75% of final size */
25 #define NFT_RHASH_ELEMENT_HINT 3
26 
27 struct nft_rhash {
28 	struct rhashtable		ht;
29 	struct delayed_work		gc_work;
30 };
31 
32 struct nft_rhash_elem {
33 	struct rhash_head		node;
34 	struct nft_set_ext		ext;
35 };
36 
37 struct nft_rhash_cmp_arg {
38 	const struct nft_set		*set;
39 	const u32			*key;
40 	u8				genmask;
41 };
42 
43 static inline u32 nft_rhash_key(const void *data, u32 len, u32 seed)
44 {
45 	const struct nft_rhash_cmp_arg *arg = data;
46 
47 	return jhash(arg->key, len, seed);
48 }
49 
50 static inline u32 nft_rhash_obj(const void *data, u32 len, u32 seed)
51 {
52 	const struct nft_rhash_elem *he = data;
53 
54 	return jhash(nft_set_ext_key(&he->ext), len, seed);
55 }
56 
57 static inline int nft_rhash_cmp(struct rhashtable_compare_arg *arg,
58 				const void *ptr)
59 {
60 	const struct nft_rhash_cmp_arg *x = arg->key;
61 	const struct nft_rhash_elem *he = ptr;
62 
63 	if (memcmp(nft_set_ext_key(&he->ext), x->key, x->set->klen))
64 		return 1;
65 	if (nft_set_elem_expired(&he->ext))
66 		return 1;
67 	if (!nft_set_elem_active(&he->ext, x->genmask))
68 		return 1;
69 	return 0;
70 }
71 
72 static const struct rhashtable_params nft_rhash_params = {
73 	.head_offset		= offsetof(struct nft_rhash_elem, node),
74 	.hashfn			= nft_rhash_key,
75 	.obj_hashfn		= nft_rhash_obj,
76 	.obj_cmpfn		= nft_rhash_cmp,
77 	.automatic_shrinking	= true,
78 };
79 
80 static bool nft_rhash_lookup(const struct net *net, const struct nft_set *set,
81 			     const u32 *key, const struct nft_set_ext **ext)
82 {
83 	struct nft_rhash *priv = nft_set_priv(set);
84 	const struct nft_rhash_elem *he;
85 	struct nft_rhash_cmp_arg arg = {
86 		.genmask = nft_genmask_cur(net),
87 		.set	 = set,
88 		.key	 = key,
89 	};
90 
91 	he = rhashtable_lookup_fast(&priv->ht, &arg, nft_rhash_params);
92 	if (he != NULL)
93 		*ext = &he->ext;
94 
95 	return !!he;
96 }
97 
98 static void *nft_rhash_get(const struct net *net, const struct nft_set *set,
99 			   const struct nft_set_elem *elem, unsigned int flags)
100 {
101 	struct nft_rhash *priv = nft_set_priv(set);
102 	struct nft_rhash_elem *he;
103 	struct nft_rhash_cmp_arg arg = {
104 		.genmask = nft_genmask_cur(net),
105 		.set	 = set,
106 		.key	 = elem->key.val.data,
107 	};
108 
109 	he = rhashtable_lookup_fast(&priv->ht, &arg, nft_rhash_params);
110 	if (he != NULL)
111 		return he;
112 
113 	return ERR_PTR(-ENOENT);
114 }
115 
116 static bool nft_rhash_update(struct nft_set *set, const u32 *key,
117 			     void *(*new)(struct nft_set *,
118 					  const struct nft_expr *,
119 					  struct nft_regs *regs),
120 			     const struct nft_expr *expr,
121 			     struct nft_regs *regs,
122 			     const struct nft_set_ext **ext)
123 {
124 	struct nft_rhash *priv = nft_set_priv(set);
125 	struct nft_rhash_elem *he, *prev;
126 	struct nft_rhash_cmp_arg arg = {
127 		.genmask = NFT_GENMASK_ANY,
128 		.set	 = set,
129 		.key	 = key,
130 	};
131 
132 	he = rhashtable_lookup_fast(&priv->ht, &arg, nft_rhash_params);
133 	if (he != NULL)
134 		goto out;
135 
136 	he = new(set, expr, regs);
137 	if (he == NULL)
138 		goto err1;
139 
140 	prev = rhashtable_lookup_get_insert_key(&priv->ht, &arg, &he->node,
141 						nft_rhash_params);
142 	if (IS_ERR(prev))
143 		goto err2;
144 
145 	/* Another cpu may race to insert the element with the same key */
146 	if (prev) {
147 		nft_set_elem_destroy(set, he, true);
148 		he = prev;
149 	}
150 
151 out:
152 	*ext = &he->ext;
153 	return true;
154 
155 err2:
156 	nft_set_elem_destroy(set, he, true);
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_fast(&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 void nft_rhash_walk(const struct nft_ctx *ctx, struct nft_set *set,
241 			   struct nft_set_iter *iter)
242 {
243 	struct nft_rhash *priv = nft_set_priv(set);
244 	struct nft_rhash_elem *he;
245 	struct rhashtable_iter hti;
246 	struct nft_set_elem elem;
247 	int err;
248 
249 	err = rhashtable_walk_init(&priv->ht, &hti, GFP_ATOMIC);
250 	iter->err = err;
251 	if (err)
252 		return;
253 
254 	rhashtable_walk_start(&hti);
255 
256 	while ((he = rhashtable_walk_next(&hti))) {
257 		if (IS_ERR(he)) {
258 			err = PTR_ERR(he);
259 			if (err != -EAGAIN) {
260 				iter->err = err;
261 				goto out;
262 			}
263 
264 			continue;
265 		}
266 
267 		if (iter->count < iter->skip)
268 			goto cont;
269 		if (nft_set_elem_expired(&he->ext))
270 			goto cont;
271 		if (!nft_set_elem_active(&he->ext, iter->genmask))
272 			goto cont;
273 
274 		elem.priv = he;
275 
276 		iter->err = iter->fn(ctx, set, iter, &elem);
277 		if (iter->err < 0)
278 			goto out;
279 
280 cont:
281 		iter->count++;
282 	}
283 
284 out:
285 	rhashtable_walk_stop(&hti);
286 	rhashtable_walk_exit(&hti);
287 }
288 
289 static void nft_rhash_gc(struct work_struct *work)
290 {
291 	struct nft_set *set;
292 	struct nft_rhash_elem *he;
293 	struct nft_rhash *priv;
294 	struct nft_set_gc_batch *gcb = NULL;
295 	struct rhashtable_iter hti;
296 	int err;
297 
298 	priv = container_of(work, struct nft_rhash, gc_work.work);
299 	set  = nft_set_container_of(priv);
300 
301 	err = rhashtable_walk_init(&priv->ht, &hti, GFP_KERNEL);
302 	if (err)
303 		goto schedule;
304 
305 	rhashtable_walk_start(&hti);
306 
307 	while ((he = rhashtable_walk_next(&hti))) {
308 		if (IS_ERR(he)) {
309 			if (PTR_ERR(he) != -EAGAIN)
310 				goto out;
311 			continue;
312 		}
313 
314 		if (nft_set_ext_exists(&he->ext, NFT_SET_EXT_EXPR)) {
315 			struct nft_expr *expr = nft_set_ext_expr(&he->ext);
316 
317 			if (expr->ops->gc &&
318 			    expr->ops->gc(read_pnet(&set->net), expr))
319 				goto gc;
320 		}
321 		if (!nft_set_elem_expired(&he->ext))
322 			continue;
323 gc:
324 		if (nft_set_elem_mark_busy(&he->ext))
325 			continue;
326 
327 		gcb = nft_set_gc_batch_check(set, gcb, GFP_ATOMIC);
328 		if (gcb == NULL)
329 			goto out;
330 		rhashtable_remove_fast(&priv->ht, &he->node, nft_rhash_params);
331 		atomic_dec(&set->nelems);
332 		nft_set_gc_batch_add(gcb, he);
333 	}
334 out:
335 	rhashtable_walk_stop(&hti);
336 	rhashtable_walk_exit(&hti);
337 
338 	nft_set_gc_batch_complete(gcb);
339 schedule:
340 	queue_delayed_work(system_power_efficient_wq, &priv->gc_work,
341 			   nft_set_gc_interval(set));
342 }
343 
344 static unsigned int nft_rhash_privsize(const struct nlattr * const nla[],
345 				       const struct nft_set_desc *desc)
346 {
347 	return sizeof(struct nft_rhash);
348 }
349 
350 static void nft_rhash_gc_init(const struct nft_set *set)
351 {
352 	struct nft_rhash *priv = nft_set_priv(set);
353 
354 	queue_delayed_work(system_power_efficient_wq, &priv->gc_work,
355 			   nft_set_gc_interval(set));
356 }
357 
358 static int nft_rhash_init(const struct nft_set *set,
359 			  const struct nft_set_desc *desc,
360 			  const struct nlattr * const tb[])
361 {
362 	struct nft_rhash *priv = nft_set_priv(set);
363 	struct rhashtable_params params = nft_rhash_params;
364 	int err;
365 
366 	params.nelem_hint = desc->size ?: NFT_RHASH_ELEMENT_HINT;
367 	params.key_len	  = set->klen;
368 
369 	err = rhashtable_init(&priv->ht, &params);
370 	if (err < 0)
371 		return err;
372 
373 	INIT_DEFERRABLE_WORK(&priv->gc_work, nft_rhash_gc);
374 	if (set->flags & NFT_SET_TIMEOUT)
375 		nft_rhash_gc_init(set);
376 
377 	return 0;
378 }
379 
380 static void nft_rhash_elem_destroy(void *ptr, void *arg)
381 {
382 	nft_set_elem_destroy(arg, ptr, true);
383 }
384 
385 static void nft_rhash_destroy(const struct nft_set *set)
386 {
387 	struct nft_rhash *priv = nft_set_priv(set);
388 
389 	cancel_delayed_work_sync(&priv->gc_work);
390 	rcu_barrier();
391 	rhashtable_free_and_destroy(&priv->ht, nft_rhash_elem_destroy,
392 				    (void *)set);
393 }
394 
395 static u32 nft_hash_buckets(u32 size)
396 {
397 	return roundup_pow_of_two(size * 4 / 3);
398 }
399 
400 static bool nft_rhash_estimate(const struct nft_set_desc *desc, u32 features,
401 			       struct nft_set_estimate *est)
402 {
403 	est->size   = ~0;
404 	est->lookup = NFT_SET_CLASS_O_1;
405 	est->space  = NFT_SET_CLASS_O_N;
406 
407 	return true;
408 }
409 
410 struct nft_hash {
411 	u32				seed;
412 	u32				buckets;
413 	struct hlist_head		table[];
414 };
415 
416 struct nft_hash_elem {
417 	struct hlist_node		node;
418 	struct nft_set_ext		ext;
419 };
420 
421 static bool nft_hash_lookup(const struct net *net, const struct nft_set *set,
422 			    const u32 *key, const struct nft_set_ext **ext)
423 {
424 	struct nft_hash *priv = nft_set_priv(set);
425 	u8 genmask = nft_genmask_cur(net);
426 	const struct nft_hash_elem *he;
427 	u32 hash;
428 
429 	hash = jhash(key, set->klen, priv->seed);
430 	hash = reciprocal_scale(hash, priv->buckets);
431 	hlist_for_each_entry_rcu(he, &priv->table[hash], node) {
432 		if (!memcmp(nft_set_ext_key(&he->ext), key, set->klen) &&
433 		    nft_set_elem_active(&he->ext, genmask)) {
434 			*ext = &he->ext;
435 			return true;
436 		}
437 	}
438 	return false;
439 }
440 
441 static void *nft_hash_get(const struct net *net, const struct nft_set *set,
442 			  const struct nft_set_elem *elem, unsigned int flags)
443 {
444 	struct nft_hash *priv = nft_set_priv(set);
445 	u8 genmask = nft_genmask_cur(net);
446 	struct nft_hash_elem *he;
447 	u32 hash;
448 
449 	hash = jhash(elem->key.val.data, set->klen, priv->seed);
450 	hash = reciprocal_scale(hash, priv->buckets);
451 	hlist_for_each_entry_rcu(he, &priv->table[hash], node) {
452 		if (!memcmp(nft_set_ext_key(&he->ext), elem->key.val.data, set->klen) &&
453 		    nft_set_elem_active(&he->ext, genmask))
454 			return he;
455 	}
456 	return ERR_PTR(-ENOENT);
457 }
458 
459 /* nft_hash_select_ops() makes sure key size can be either 2 or 4 bytes . */
460 static inline u32 nft_hash_key(const u32 *key, u32 klen)
461 {
462 	if (klen == 4)
463 		return *key;
464 
465 	return *(u16 *)key;
466 }
467 
468 static bool nft_hash_lookup_fast(const struct net *net,
469 				 const struct nft_set *set,
470 				 const u32 *key, const struct nft_set_ext **ext)
471 {
472 	struct nft_hash *priv = nft_set_priv(set);
473 	u8 genmask = nft_genmask_cur(net);
474 	const struct nft_hash_elem *he;
475 	u32 hash, k1, k2;
476 
477 	k1 = nft_hash_key(key, set->klen);
478 	hash = jhash_1word(k1, priv->seed);
479 	hash = reciprocal_scale(hash, priv->buckets);
480 	hlist_for_each_entry_rcu(he, &priv->table[hash], node) {
481 		k2 = nft_hash_key(nft_set_ext_key(&he->ext)->data, set->klen);
482 		if (k1 == k2 &&
483 		    nft_set_elem_active(&he->ext, genmask)) {
484 			*ext = &he->ext;
485 			return true;
486 		}
487 	}
488 	return false;
489 }
490 
491 static int nft_hash_insert(const struct net *net, const struct nft_set *set,
492 			   const struct nft_set_elem *elem,
493 			   struct nft_set_ext **ext)
494 {
495 	struct nft_hash_elem *this = elem->priv, *he;
496 	struct nft_hash *priv = nft_set_priv(set);
497 	u8 genmask = nft_genmask_next(net);
498 	u32 hash;
499 
500 	hash = jhash(nft_set_ext_key(&this->ext), set->klen, priv->seed);
501 	hash = reciprocal_scale(hash, priv->buckets);
502 	hlist_for_each_entry(he, &priv->table[hash], node) {
503 		if (!memcmp(nft_set_ext_key(&this->ext),
504 			    nft_set_ext_key(&he->ext), set->klen) &&
505 		    nft_set_elem_active(&he->ext, genmask)) {
506 			*ext = &he->ext;
507 			return -EEXIST;
508 		}
509 	}
510 	hlist_add_head_rcu(&this->node, &priv->table[hash]);
511 	return 0;
512 }
513 
514 static void nft_hash_activate(const struct net *net, const struct nft_set *set,
515 			      const struct nft_set_elem *elem)
516 {
517 	struct nft_hash_elem *he = elem->priv;
518 
519 	nft_set_elem_change_active(net, set, &he->ext);
520 }
521 
522 static bool nft_hash_flush(const struct net *net,
523 			   const struct nft_set *set, void *priv)
524 {
525 	struct nft_hash_elem *he = priv;
526 
527 	nft_set_elem_change_active(net, set, &he->ext);
528 	return true;
529 }
530 
531 static void *nft_hash_deactivate(const struct net *net,
532 				 const struct nft_set *set,
533 				 const struct nft_set_elem *elem)
534 {
535 	struct nft_hash *priv = nft_set_priv(set);
536 	struct nft_hash_elem *this = elem->priv, *he;
537 	u8 genmask = nft_genmask_next(net);
538 	u32 hash;
539 
540 	hash = jhash(nft_set_ext_key(&this->ext), set->klen, priv->seed);
541 	hash = reciprocal_scale(hash, priv->buckets);
542 	hlist_for_each_entry(he, &priv->table[hash], node) {
543 		if (!memcmp(nft_set_ext_key(&this->ext), &elem->key.val,
544 			    set->klen) &&
545 		    nft_set_elem_active(&he->ext, genmask)) {
546 			nft_set_elem_change_active(net, set, &he->ext);
547 			return he;
548 		}
549 	}
550 	return NULL;
551 }
552 
553 static void nft_hash_remove(const struct net *net,
554 			    const struct nft_set *set,
555 			    const struct nft_set_elem *elem)
556 {
557 	struct nft_hash_elem *he = elem->priv;
558 
559 	hlist_del_rcu(&he->node);
560 }
561 
562 static void nft_hash_walk(const struct nft_ctx *ctx, struct nft_set *set,
563 			  struct nft_set_iter *iter)
564 {
565 	struct nft_hash *priv = nft_set_priv(set);
566 	struct nft_hash_elem *he;
567 	struct nft_set_elem elem;
568 	int i;
569 
570 	for (i = 0; i < priv->buckets; i++) {
571 		hlist_for_each_entry_rcu(he, &priv->table[i], node) {
572 			if (iter->count < iter->skip)
573 				goto cont;
574 			if (!nft_set_elem_active(&he->ext, iter->genmask))
575 				goto cont;
576 
577 			elem.priv = he;
578 
579 			iter->err = iter->fn(ctx, set, iter, &elem);
580 			if (iter->err < 0)
581 				return;
582 cont:
583 			iter->count++;
584 		}
585 	}
586 }
587 
588 static unsigned int nft_hash_privsize(const struct nlattr * const nla[],
589 				      const struct nft_set_desc *desc)
590 {
591 	return sizeof(struct nft_hash) +
592 	       nft_hash_buckets(desc->size) * sizeof(struct hlist_head);
593 }
594 
595 static int nft_hash_init(const struct nft_set *set,
596 			 const struct nft_set_desc *desc,
597 			 const struct nlattr * const tb[])
598 {
599 	struct nft_hash *priv = nft_set_priv(set);
600 
601 	priv->buckets = nft_hash_buckets(desc->size);
602 	get_random_bytes(&priv->seed, sizeof(priv->seed));
603 
604 	return 0;
605 }
606 
607 static void nft_hash_destroy(const struct nft_set *set)
608 {
609 	struct nft_hash *priv = nft_set_priv(set);
610 	struct nft_hash_elem *he;
611 	struct hlist_node *next;
612 	int i;
613 
614 	for (i = 0; i < priv->buckets; i++) {
615 		hlist_for_each_entry_safe(he, next, &priv->table[i], node) {
616 			hlist_del_rcu(&he->node);
617 			nft_set_elem_destroy(set, he, true);
618 		}
619 	}
620 }
621 
622 static bool nft_hash_estimate(const struct nft_set_desc *desc, u32 features,
623 			      struct nft_set_estimate *est)
624 {
625 	if (!desc->size)
626 		return false;
627 
628 	if (desc->klen == 4)
629 		return false;
630 
631 	est->size   = sizeof(struct nft_hash) +
632 		      nft_hash_buckets(desc->size) * sizeof(struct hlist_head) +
633 		      desc->size * sizeof(struct nft_hash_elem);
634 	est->lookup = NFT_SET_CLASS_O_1;
635 	est->space  = NFT_SET_CLASS_O_N;
636 
637 	return true;
638 }
639 
640 static bool nft_hash_fast_estimate(const struct nft_set_desc *desc, u32 features,
641 			      struct nft_set_estimate *est)
642 {
643 	if (!desc->size)
644 		return false;
645 
646 	if (desc->klen != 4)
647 		return false;
648 
649 	est->size   = sizeof(struct nft_hash) +
650 		      nft_hash_buckets(desc->size) * sizeof(struct hlist_head) +
651 		      desc->size * sizeof(struct nft_hash_elem);
652 	est->lookup = NFT_SET_CLASS_O_1;
653 	est->space  = NFT_SET_CLASS_O_N;
654 
655 	return true;
656 }
657 
658 struct nft_set_type nft_set_rhash_type __read_mostly = {
659 	.owner		= THIS_MODULE,
660 	.features	= NFT_SET_MAP | NFT_SET_OBJECT |
661 			  NFT_SET_TIMEOUT | NFT_SET_EVAL,
662 	.ops		= {
663 		.privsize       = nft_rhash_privsize,
664 		.elemsize	= offsetof(struct nft_rhash_elem, ext),
665 		.estimate	= nft_rhash_estimate,
666 		.init		= nft_rhash_init,
667 		.gc_init	= nft_rhash_gc_init,
668 		.destroy	= nft_rhash_destroy,
669 		.insert		= nft_rhash_insert,
670 		.activate	= nft_rhash_activate,
671 		.deactivate	= nft_rhash_deactivate,
672 		.flush		= nft_rhash_flush,
673 		.remove		= nft_rhash_remove,
674 		.lookup		= nft_rhash_lookup,
675 		.update		= nft_rhash_update,
676 		.walk		= nft_rhash_walk,
677 		.get		= nft_rhash_get,
678 	},
679 };
680 
681 struct nft_set_type nft_set_hash_type __read_mostly = {
682 	.owner		= THIS_MODULE,
683 	.features	= NFT_SET_MAP | NFT_SET_OBJECT,
684 	.ops		= {
685 		.privsize       = nft_hash_privsize,
686 		.elemsize	= offsetof(struct nft_hash_elem, ext),
687 		.estimate	= nft_hash_estimate,
688 		.init		= nft_hash_init,
689 		.destroy	= nft_hash_destroy,
690 		.insert		= nft_hash_insert,
691 		.activate	= nft_hash_activate,
692 		.deactivate	= nft_hash_deactivate,
693 		.flush		= nft_hash_flush,
694 		.remove		= nft_hash_remove,
695 		.lookup		= nft_hash_lookup,
696 		.walk		= nft_hash_walk,
697 		.get		= nft_hash_get,
698 	},
699 };
700 
701 struct nft_set_type nft_set_hash_fast_type __read_mostly = {
702 	.owner		= THIS_MODULE,
703 	.features	= NFT_SET_MAP | NFT_SET_OBJECT,
704 	.ops		= {
705 		.privsize       = nft_hash_privsize,
706 		.elemsize	= offsetof(struct nft_hash_elem, ext),
707 		.estimate	= nft_hash_fast_estimate,
708 		.init		= nft_hash_init,
709 		.destroy	= nft_hash_destroy,
710 		.insert		= nft_hash_insert,
711 		.activate	= nft_hash_activate,
712 		.deactivate	= nft_hash_deactivate,
713 		.flush		= nft_hash_flush,
714 		.remove		= nft_hash_remove,
715 		.lookup		= nft_hash_lookup_fast,
716 		.walk		= nft_hash_walk,
717 		.get		= nft_hash_get,
718 	},
719 };
720