xref: /openbmc/linux/net/netfilter/nft_set_hash.c (revision 31af04cd) 
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(&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(&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(&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(&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 
248 	rhashtable_walk_enter(&priv->ht, &hti);
249 	rhashtable_walk_start(&hti);
250 
251 	while ((he = rhashtable_walk_next(&hti))) {
252 		if (IS_ERR(he)) {
253 			if (PTR_ERR(he) != -EAGAIN) {
254 				iter->err = PTR_ERR(he);
255 				break;
256 			}
257 
258 			continue;
259 		}
260 
261 		if (iter->count < iter->skip)
262 			goto cont;
263 		if (nft_set_elem_expired(&he->ext))
264 			goto cont;
265 		if (!nft_set_elem_active(&he->ext, iter->genmask))
266 			goto cont;
267 
268 		elem.priv = he;
269 
270 		iter->err = iter->fn(ctx, set, iter, &elem);
271 		if (iter->err < 0)
272 			break;
273 
274 cont:
275 		iter->count++;
276 	}
277 	rhashtable_walk_stop(&hti);
278 	rhashtable_walk_exit(&hti);
279 }
280 
281 static void nft_rhash_gc(struct work_struct *work)
282 {
283 	struct nft_set *set;
284 	struct nft_rhash_elem *he;
285 	struct nft_rhash *priv;
286 	struct nft_set_gc_batch *gcb = NULL;
287 	struct rhashtable_iter hti;
288 
289 	priv = container_of(work, struct nft_rhash, gc_work.work);
290 	set  = nft_set_container_of(priv);
291 
292 	rhashtable_walk_enter(&priv->ht, &hti);
293 	rhashtable_walk_start(&hti);
294 
295 	while ((he = rhashtable_walk_next(&hti))) {
296 		if (IS_ERR(he)) {
297 			if (PTR_ERR(he) != -EAGAIN)
298 				break;
299 			continue;
300 		}
301 
302 		if (nft_set_ext_exists(&he->ext, NFT_SET_EXT_EXPR)) {
303 			struct nft_expr *expr = nft_set_ext_expr(&he->ext);
304 
305 			if (expr->ops->gc &&
306 			    expr->ops->gc(read_pnet(&set->net), expr))
307 				goto gc;
308 		}
309 		if (!nft_set_elem_expired(&he->ext))
310 			continue;
311 gc:
312 		if (nft_set_elem_mark_busy(&he->ext))
313 			continue;
314 
315 		gcb = nft_set_gc_batch_check(set, gcb, GFP_ATOMIC);
316 		if (gcb == NULL)
317 			break;
318 		rhashtable_remove_fast(&priv->ht, &he->node, nft_rhash_params);
319 		atomic_dec(&set->nelems);
320 		nft_set_gc_batch_add(gcb, he);
321 	}
322 	rhashtable_walk_stop(&hti);
323 	rhashtable_walk_exit(&hti);
324 
325 	nft_set_gc_batch_complete(gcb);
326 	queue_delayed_work(system_power_efficient_wq, &priv->gc_work,
327 			   nft_set_gc_interval(set));
328 }
329 
330 static u64 nft_rhash_privsize(const struct nlattr * const nla[],
331 			      const struct nft_set_desc *desc)
332 {
333 	return sizeof(struct nft_rhash);
334 }
335 
336 static void nft_rhash_gc_init(const struct nft_set *set)
337 {
338 	struct nft_rhash *priv = nft_set_priv(set);
339 
340 	queue_delayed_work(system_power_efficient_wq, &priv->gc_work,
341 			   nft_set_gc_interval(set));
342 }
343 
344 static int nft_rhash_init(const struct nft_set *set,
345 			  const struct nft_set_desc *desc,
346 			  const struct nlattr * const tb[])
347 {
348 	struct nft_rhash *priv = nft_set_priv(set);
349 	struct rhashtable_params params = nft_rhash_params;
350 	int err;
351 
352 	params.nelem_hint = desc->size ?: NFT_RHASH_ELEMENT_HINT;
353 	params.key_len	  = set->klen;
354 
355 	err = rhashtable_init(&priv->ht, &params);
356 	if (err < 0)
357 		return err;
358 
359 	INIT_DEFERRABLE_WORK(&priv->gc_work, nft_rhash_gc);
360 	if (set->flags & NFT_SET_TIMEOUT)
361 		nft_rhash_gc_init(set);
362 
363 	return 0;
364 }
365 
366 static void nft_rhash_elem_destroy(void *ptr, void *arg)
367 {
368 	nft_set_elem_destroy(arg, ptr, true);
369 }
370 
371 static void nft_rhash_destroy(const struct nft_set *set)
372 {
373 	struct nft_rhash *priv = nft_set_priv(set);
374 
375 	cancel_delayed_work_sync(&priv->gc_work);
376 	rcu_barrier();
377 	rhashtable_free_and_destroy(&priv->ht, nft_rhash_elem_destroy,
378 				    (void *)set);
379 }
380 
381 static u32 nft_hash_buckets(u32 size)
382 {
383 	return roundup_pow_of_two(size * 4 / 3);
384 }
385 
386 static bool nft_rhash_estimate(const struct nft_set_desc *desc, u32 features,
387 			       struct nft_set_estimate *est)
388 {
389 	est->size   = ~0;
390 	est->lookup = NFT_SET_CLASS_O_1;
391 	est->space  = NFT_SET_CLASS_O_N;
392 
393 	return true;
394 }
395 
396 struct nft_hash {
397 	u32				seed;
398 	u32				buckets;
399 	struct hlist_head		table[];
400 };
401 
402 struct nft_hash_elem {
403 	struct hlist_node		node;
404 	struct nft_set_ext		ext;
405 };
406 
407 static bool nft_hash_lookup(const struct net *net, const struct nft_set *set,
408 			    const u32 *key, const struct nft_set_ext **ext)
409 {
410 	struct nft_hash *priv = nft_set_priv(set);
411 	u8 genmask = nft_genmask_cur(net);
412 	const struct nft_hash_elem *he;
413 	u32 hash;
414 
415 	hash = jhash(key, set->klen, priv->seed);
416 	hash = reciprocal_scale(hash, priv->buckets);
417 	hlist_for_each_entry_rcu(he, &priv->table[hash], node) {
418 		if (!memcmp(nft_set_ext_key(&he->ext), key, set->klen) &&
419 		    nft_set_elem_active(&he->ext, genmask)) {
420 			*ext = &he->ext;
421 			return true;
422 		}
423 	}
424 	return false;
425 }
426 
427 static void *nft_hash_get(const struct net *net, const struct nft_set *set,
428 			  const struct nft_set_elem *elem, unsigned int flags)
429 {
430 	struct nft_hash *priv = nft_set_priv(set);
431 	u8 genmask = nft_genmask_cur(net);
432 	struct nft_hash_elem *he;
433 	u32 hash;
434 
435 	hash = jhash(elem->key.val.data, set->klen, priv->seed);
436 	hash = reciprocal_scale(hash, priv->buckets);
437 	hlist_for_each_entry_rcu(he, &priv->table[hash], node) {
438 		if (!memcmp(nft_set_ext_key(&he->ext), elem->key.val.data, set->klen) &&
439 		    nft_set_elem_active(&he->ext, genmask))
440 			return he;
441 	}
442 	return ERR_PTR(-ENOENT);
443 }
444 
445 /* nft_hash_select_ops() makes sure key size can be either 2 or 4 bytes . */
446 static inline u32 nft_hash_key(const u32 *key, u32 klen)
447 {
448 	if (klen == 4)
449 		return *key;
450 
451 	return *(u16 *)key;
452 }
453 
454 static bool nft_hash_lookup_fast(const struct net *net,
455 				 const struct nft_set *set,
456 				 const u32 *key, const struct nft_set_ext **ext)
457 {
458 	struct nft_hash *priv = nft_set_priv(set);
459 	u8 genmask = nft_genmask_cur(net);
460 	const struct nft_hash_elem *he;
461 	u32 hash, k1, k2;
462 
463 	k1 = nft_hash_key(key, set->klen);
464 	hash = jhash_1word(k1, priv->seed);
465 	hash = reciprocal_scale(hash, priv->buckets);
466 	hlist_for_each_entry_rcu(he, &priv->table[hash], node) {
467 		k2 = nft_hash_key(nft_set_ext_key(&he->ext)->data, set->klen);
468 		if (k1 == k2 &&
469 		    nft_set_elem_active(&he->ext, genmask)) {
470 			*ext = &he->ext;
471 			return true;
472 		}
473 	}
474 	return false;
475 }
476 
477 static int nft_hash_insert(const struct net *net, const struct nft_set *set,
478 			   const struct nft_set_elem *elem,
479 			   struct nft_set_ext **ext)
480 {
481 	struct nft_hash_elem *this = elem->priv, *he;
482 	struct nft_hash *priv = nft_set_priv(set);
483 	u8 genmask = nft_genmask_next(net);
484 	u32 hash;
485 
486 	hash = jhash(nft_set_ext_key(&this->ext), set->klen, priv->seed);
487 	hash = reciprocal_scale(hash, priv->buckets);
488 	hlist_for_each_entry(he, &priv->table[hash], node) {
489 		if (!memcmp(nft_set_ext_key(&this->ext),
490 			    nft_set_ext_key(&he->ext), set->klen) &&
491 		    nft_set_elem_active(&he->ext, genmask)) {
492 			*ext = &he->ext;
493 			return -EEXIST;
494 		}
495 	}
496 	hlist_add_head_rcu(&this->node, &priv->table[hash]);
497 	return 0;
498 }
499 
500 static void nft_hash_activate(const struct net *net, const struct nft_set *set,
501 			      const struct nft_set_elem *elem)
502 {
503 	struct nft_hash_elem *he = elem->priv;
504 
505 	nft_set_elem_change_active(net, set, &he->ext);
506 }
507 
508 static bool nft_hash_flush(const struct net *net,
509 			   const struct nft_set *set, void *priv)
510 {
511 	struct nft_hash_elem *he = priv;
512 
513 	nft_set_elem_change_active(net, set, &he->ext);
514 	return true;
515 }
516 
517 static void *nft_hash_deactivate(const struct net *net,
518 				 const struct nft_set *set,
519 				 const struct nft_set_elem *elem)
520 {
521 	struct nft_hash *priv = nft_set_priv(set);
522 	struct nft_hash_elem *this = elem->priv, *he;
523 	u8 genmask = nft_genmask_next(net);
524 	u32 hash;
525 
526 	hash = jhash(nft_set_ext_key(&this->ext), set->klen, priv->seed);
527 	hash = reciprocal_scale(hash, priv->buckets);
528 	hlist_for_each_entry(he, &priv->table[hash], node) {
529 		if (!memcmp(nft_set_ext_key(&this->ext), &elem->key.val,
530 			    set->klen) &&
531 		    nft_set_elem_active(&he->ext, genmask)) {
532 			nft_set_elem_change_active(net, set, &he->ext);
533 			return he;
534 		}
535 	}
536 	return NULL;
537 }
538 
539 static void nft_hash_remove(const struct net *net,
540 			    const struct nft_set *set,
541 			    const struct nft_set_elem *elem)
542 {
543 	struct nft_hash_elem *he = elem->priv;
544 
545 	hlist_del_rcu(&he->node);
546 }
547 
548 static void nft_hash_walk(const struct nft_ctx *ctx, struct nft_set *set,
549 			  struct nft_set_iter *iter)
550 {
551 	struct nft_hash *priv = nft_set_priv(set);
552 	struct nft_hash_elem *he;
553 	struct nft_set_elem elem;
554 	int i;
555 
556 	for (i = 0; i < priv->buckets; i++) {
557 		hlist_for_each_entry_rcu(he, &priv->table[i], node) {
558 			if (iter->count < iter->skip)
559 				goto cont;
560 			if (!nft_set_elem_active(&he->ext, iter->genmask))
561 				goto cont;
562 
563 			elem.priv = he;
564 
565 			iter->err = iter->fn(ctx, set, iter, &elem);
566 			if (iter->err < 0)
567 				return;
568 cont:
569 			iter->count++;
570 		}
571 	}
572 }
573 
574 static u64 nft_hash_privsize(const struct nlattr * const nla[],
575 			     const struct nft_set_desc *desc)
576 {
577 	return sizeof(struct nft_hash) +
578 	       nft_hash_buckets(desc->size) * sizeof(struct hlist_head);
579 }
580 
581 static int nft_hash_init(const struct nft_set *set,
582 			 const struct nft_set_desc *desc,
583 			 const struct nlattr * const tb[])
584 {
585 	struct nft_hash *priv = nft_set_priv(set);
586 
587 	priv->buckets = nft_hash_buckets(desc->size);
588 	get_random_bytes(&priv->seed, sizeof(priv->seed));
589 
590 	return 0;
591 }
592 
593 static void nft_hash_destroy(const struct nft_set *set)
594 {
595 	struct nft_hash *priv = nft_set_priv(set);
596 	struct nft_hash_elem *he;
597 	struct hlist_node *next;
598 	int i;
599 
600 	for (i = 0; i < priv->buckets; i++) {
601 		hlist_for_each_entry_safe(he, next, &priv->table[i], node) {
602 			hlist_del_rcu(&he->node);
603 			nft_set_elem_destroy(set, he, true);
604 		}
605 	}
606 }
607 
608 static bool nft_hash_estimate(const struct nft_set_desc *desc, u32 features,
609 			      struct nft_set_estimate *est)
610 {
611 	if (!desc->size)
612 		return false;
613 
614 	if (desc->klen == 4)
615 		return false;
616 
617 	est->size   = sizeof(struct nft_hash) +
618 		      nft_hash_buckets(desc->size) * sizeof(struct hlist_head) +
619 		      desc->size * sizeof(struct nft_hash_elem);
620 	est->lookup = NFT_SET_CLASS_O_1;
621 	est->space  = NFT_SET_CLASS_O_N;
622 
623 	return true;
624 }
625 
626 static bool nft_hash_fast_estimate(const struct nft_set_desc *desc, u32 features,
627 			      struct nft_set_estimate *est)
628 {
629 	if (!desc->size)
630 		return false;
631 
632 	if (desc->klen != 4)
633 		return false;
634 
635 	est->size   = sizeof(struct nft_hash) +
636 		      nft_hash_buckets(desc->size) * sizeof(struct hlist_head) +
637 		      desc->size * sizeof(struct nft_hash_elem);
638 	est->lookup = NFT_SET_CLASS_O_1;
639 	est->space  = NFT_SET_CLASS_O_N;
640 
641 	return true;
642 }
643 
644 struct nft_set_type nft_set_rhash_type __read_mostly = {
645 	.owner		= THIS_MODULE,
646 	.features	= NFT_SET_MAP | NFT_SET_OBJECT |
647 			  NFT_SET_TIMEOUT | NFT_SET_EVAL,
648 	.ops		= {
649 		.privsize       = nft_rhash_privsize,
650 		.elemsize	= offsetof(struct nft_rhash_elem, ext),
651 		.estimate	= nft_rhash_estimate,
652 		.init		= nft_rhash_init,
653 		.gc_init	= nft_rhash_gc_init,
654 		.destroy	= nft_rhash_destroy,
655 		.insert		= nft_rhash_insert,
656 		.activate	= nft_rhash_activate,
657 		.deactivate	= nft_rhash_deactivate,
658 		.flush		= nft_rhash_flush,
659 		.remove		= nft_rhash_remove,
660 		.lookup		= nft_rhash_lookup,
661 		.update		= nft_rhash_update,
662 		.walk		= nft_rhash_walk,
663 		.get		= nft_rhash_get,
664 	},
665 };
666 
667 struct nft_set_type nft_set_hash_type __read_mostly = {
668 	.owner		= THIS_MODULE,
669 	.features	= NFT_SET_MAP | NFT_SET_OBJECT,
670 	.ops		= {
671 		.privsize       = nft_hash_privsize,
672 		.elemsize	= offsetof(struct nft_hash_elem, ext),
673 		.estimate	= nft_hash_estimate,
674 		.init		= nft_hash_init,
675 		.destroy	= nft_hash_destroy,
676 		.insert		= nft_hash_insert,
677 		.activate	= nft_hash_activate,
678 		.deactivate	= nft_hash_deactivate,
679 		.flush		= nft_hash_flush,
680 		.remove		= nft_hash_remove,
681 		.lookup		= nft_hash_lookup,
682 		.walk		= nft_hash_walk,
683 		.get		= nft_hash_get,
684 	},
685 };
686 
687 struct nft_set_type nft_set_hash_fast_type __read_mostly = {
688 	.owner		= THIS_MODULE,
689 	.features	= NFT_SET_MAP | NFT_SET_OBJECT,
690 	.ops		= {
691 		.privsize       = nft_hash_privsize,
692 		.elemsize	= offsetof(struct nft_hash_elem, ext),
693 		.estimate	= nft_hash_fast_estimate,
694 		.init		= nft_hash_init,
695 		.destroy	= nft_hash_destroy,
696 		.insert		= nft_hash_insert,
697 		.activate	= nft_hash_activate,
698 		.deactivate	= nft_hash_deactivate,
699 		.flush		= nft_hash_flush,
700 		.remove		= nft_hash_remove,
701 		.lookup		= nft_hash_lookup_fast,
702 		.walk		= nft_hash_walk,
703 		.get		= nft_hash_get,
704 	},
705 };
706