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
nft_rhash_key(const void * data,u32 len,u32 seed)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
nft_rhash_obj(const void * data,u32 len,u32 seed)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
nft_rhash_cmp(struct rhashtable_compare_arg * arg,const void * ptr)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_is_dead(&he->ext))
63 return 1;
64 if (nft_set_elem_expired(&he->ext))
65 return 1;
66 if (!nft_set_elem_active(&he->ext, x->genmask))
67 return 1;
68 return 0;
69 }
70
71 static const struct rhashtable_params nft_rhash_params = {
72 .head_offset = offsetof(struct nft_rhash_elem, node),
73 .hashfn = nft_rhash_key,
74 .obj_hashfn = nft_rhash_obj,
75 .obj_cmpfn = nft_rhash_cmp,
76 .automatic_shrinking = true,
77 };
78
79 INDIRECT_CALLABLE_SCOPE
nft_rhash_lookup(const struct net * net,const struct nft_set * set,const u32 * key,const struct nft_set_ext ** ext)80 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
nft_rhash_get(const struct net * net,const struct nft_set * set,const struct nft_set_elem * elem,unsigned int flags)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
nft_rhash_update(struct nft_set * set,const u32 * key,void * (* new)(struct nft_set *,const struct nft_expr *,struct nft_regs * regs),const struct nft_expr * expr,struct nft_regs * regs,const struct nft_set_ext ** ext)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 atomic_dec(&set->nelems);
149 he = prev;
150 }
151
152 out:
153 *ext = &he->ext;
154 return true;
155
156 err2:
157 nft_set_elem_destroy(set, he, true);
158 atomic_dec(&set->nelems);
159 err1:
160 return false;
161 }
162
nft_rhash_insert(const struct net * net,const struct nft_set * set,const struct nft_set_elem * elem,struct nft_set_ext ** ext)163 static int nft_rhash_insert(const struct net *net, const struct nft_set *set,
164 const struct nft_set_elem *elem,
165 struct nft_set_ext **ext)
166 {
167 struct nft_rhash *priv = nft_set_priv(set);
168 struct nft_rhash_elem *he = elem->priv;
169 struct nft_rhash_cmp_arg arg = {
170 .genmask = nft_genmask_next(net),
171 .set = set,
172 .key = elem->key.val.data,
173 };
174 struct nft_rhash_elem *prev;
175
176 prev = rhashtable_lookup_get_insert_key(&priv->ht, &arg, &he->node,
177 nft_rhash_params);
178 if (IS_ERR(prev))
179 return PTR_ERR(prev);
180 if (prev) {
181 *ext = &prev->ext;
182 return -EEXIST;
183 }
184 return 0;
185 }
186
nft_rhash_activate(const struct net * net,const struct nft_set * set,const struct nft_set_elem * elem)187 static void nft_rhash_activate(const struct net *net, const struct nft_set *set,
188 const struct nft_set_elem *elem)
189 {
190 struct nft_rhash_elem *he = elem->priv;
191
192 nft_set_elem_change_active(net, set, &he->ext);
193 }
194
nft_rhash_flush(const struct net * net,const struct nft_set * set,void * priv)195 static bool nft_rhash_flush(const struct net *net,
196 const struct nft_set *set, void *priv)
197 {
198 struct nft_rhash_elem *he = priv;
199
200 nft_set_elem_change_active(net, set, &he->ext);
201
202 return true;
203 }
204
nft_rhash_deactivate(const struct net * net,const struct nft_set * set,const struct nft_set_elem * elem)205 static void *nft_rhash_deactivate(const struct net *net,
206 const struct nft_set *set,
207 const struct nft_set_elem *elem)
208 {
209 struct nft_rhash *priv = nft_set_priv(set);
210 struct nft_rhash_elem *he;
211 struct nft_rhash_cmp_arg arg = {
212 .genmask = nft_genmask_next(net),
213 .set = set,
214 .key = elem->key.val.data,
215 };
216
217 rcu_read_lock();
218 he = rhashtable_lookup(&priv->ht, &arg, nft_rhash_params);
219 if (he)
220 nft_set_elem_change_active(net, set, &he->ext);
221
222 rcu_read_unlock();
223
224 return he;
225 }
226
nft_rhash_remove(const struct net * net,const struct nft_set * set,const struct nft_set_elem * elem)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
nft_rhash_delete(const struct nft_set * set,const u32 * key)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 nft_set_elem_dead(&he->ext);
253
254 return true;
255 }
256
nft_rhash_walk(const struct nft_ctx * ctx,struct nft_set * set,struct nft_set_iter * iter)257 static void nft_rhash_walk(const struct nft_ctx *ctx, struct nft_set *set,
258 struct nft_set_iter *iter)
259 {
260 struct nft_rhash *priv = nft_set_priv(set);
261 struct nft_rhash_elem *he;
262 struct rhashtable_iter hti;
263 struct nft_set_elem elem;
264
265 rhashtable_walk_enter(&priv->ht, &hti);
266 rhashtable_walk_start(&hti);
267
268 while ((he = rhashtable_walk_next(&hti))) {
269 if (IS_ERR(he)) {
270 if (PTR_ERR(he) != -EAGAIN) {
271 iter->err = PTR_ERR(he);
272 break;
273 }
274
275 continue;
276 }
277
278 if (iter->count < iter->skip)
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
nft_rhash_expr_needs_gc_run(const struct nft_set * set,struct nft_set_ext * ext)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
nft_rhash_gc(struct work_struct * work)312 static void nft_rhash_gc(struct work_struct *work)
313 {
314 struct nftables_pernet *nft_net;
315 struct nft_set *set;
316 struct nft_rhash_elem *he;
317 struct nft_rhash *priv;
318 struct rhashtable_iter hti;
319 struct nft_trans_gc *gc;
320 struct net *net;
321 u32 gc_seq;
322
323 priv = container_of(work, struct nft_rhash, gc_work.work);
324 set = nft_set_container_of(priv);
325 net = read_pnet(&set->net);
326 nft_net = nft_pernet(net);
327 gc_seq = READ_ONCE(nft_net->gc_seq);
328
329 if (nft_set_gc_is_pending(set))
330 goto done;
331
332 gc = nft_trans_gc_alloc(set, gc_seq, GFP_KERNEL);
333 if (!gc)
334 goto done;
335
336 rhashtable_walk_enter(&priv->ht, &hti);
337 rhashtable_walk_start(&hti);
338
339 while ((he = rhashtable_walk_next(&hti))) {
340 if (IS_ERR(he)) {
341 nft_trans_gc_destroy(gc);
342 gc = NULL;
343 goto try_later;
344 }
345
346 /* Ruleset has been updated, try later. */
347 if (READ_ONCE(nft_net->gc_seq) != gc_seq) {
348 nft_trans_gc_destroy(gc);
349 gc = NULL;
350 goto try_later;
351 }
352
353 if (nft_set_elem_is_dead(&he->ext))
354 goto dead_elem;
355
356 if (nft_set_ext_exists(&he->ext, NFT_SET_EXT_EXPRESSIONS) &&
357 nft_rhash_expr_needs_gc_run(set, &he->ext))
358 goto needs_gc_run;
359
360 if (!nft_set_elem_expired(&he->ext))
361 continue;
362 needs_gc_run:
363 nft_set_elem_dead(&he->ext);
364 dead_elem:
365 gc = nft_trans_gc_queue_async(gc, gc_seq, GFP_ATOMIC);
366 if (!gc)
367 goto try_later;
368
369 nft_trans_gc_elem_add(gc, he);
370 }
371
372 gc = nft_trans_gc_catchall_async(gc, gc_seq);
373
374 try_later:
375 /* catchall list iteration requires rcu read side lock. */
376 rhashtable_walk_stop(&hti);
377 rhashtable_walk_exit(&hti);
378
379 if (gc)
380 nft_trans_gc_queue_async_done(gc);
381
382 done:
383 queue_delayed_work(system_power_efficient_wq, &priv->gc_work,
384 nft_set_gc_interval(set));
385 }
386
nft_rhash_privsize(const struct nlattr * const nla[],const struct nft_set_desc * desc)387 static u64 nft_rhash_privsize(const struct nlattr * const nla[],
388 const struct nft_set_desc *desc)
389 {
390 return sizeof(struct nft_rhash);
391 }
392
nft_rhash_gc_init(const struct nft_set * set)393 static void nft_rhash_gc_init(const struct nft_set *set)
394 {
395 struct nft_rhash *priv = nft_set_priv(set);
396
397 queue_delayed_work(system_power_efficient_wq, &priv->gc_work,
398 nft_set_gc_interval(set));
399 }
400
nft_rhash_init(const struct nft_set * set,const struct nft_set_desc * desc,const struct nlattr * const tb[])401 static int nft_rhash_init(const struct nft_set *set,
402 const struct nft_set_desc *desc,
403 const struct nlattr * const tb[])
404 {
405 struct nft_rhash *priv = nft_set_priv(set);
406 struct rhashtable_params params = nft_rhash_params;
407 int err;
408
409 params.nelem_hint = desc->size ?: NFT_RHASH_ELEMENT_HINT;
410 params.key_len = set->klen;
411
412 err = rhashtable_init(&priv->ht, ¶ms);
413 if (err < 0)
414 return err;
415
416 INIT_DEFERRABLE_WORK(&priv->gc_work, nft_rhash_gc);
417 if (set->flags & (NFT_SET_TIMEOUT | NFT_SET_EVAL))
418 nft_rhash_gc_init(set);
419
420 return 0;
421 }
422
423 struct nft_rhash_ctx {
424 const struct nft_ctx ctx;
425 const struct nft_set *set;
426 };
427
nft_rhash_elem_destroy(void * ptr,void * arg)428 static void nft_rhash_elem_destroy(void *ptr, void *arg)
429 {
430 struct nft_rhash_ctx *rhash_ctx = arg;
431
432 nf_tables_set_elem_destroy(&rhash_ctx->ctx, rhash_ctx->set, ptr);
433 }
434
nft_rhash_destroy(const struct nft_ctx * ctx,const struct nft_set * set)435 static void nft_rhash_destroy(const struct nft_ctx *ctx,
436 const struct nft_set *set)
437 {
438 struct nft_rhash *priv = nft_set_priv(set);
439 struct nft_rhash_ctx rhash_ctx = {
440 .ctx = *ctx,
441 .set = set,
442 };
443
444 cancel_delayed_work_sync(&priv->gc_work);
445 rhashtable_free_and_destroy(&priv->ht, nft_rhash_elem_destroy,
446 (void *)&rhash_ctx);
447 }
448
449 /* Number of buckets is stored in u32, so cap our result to 1U<<31 */
450 #define NFT_MAX_BUCKETS (1U << 31)
451
nft_hash_buckets(u32 size)452 static u32 nft_hash_buckets(u32 size)
453 {
454 u64 val = div_u64((u64)size * 4, 3);
455
456 if (val >= NFT_MAX_BUCKETS)
457 return NFT_MAX_BUCKETS;
458
459 return roundup_pow_of_two(val);
460 }
461
nft_rhash_estimate(const struct nft_set_desc * desc,u32 features,struct nft_set_estimate * est)462 static bool nft_rhash_estimate(const struct nft_set_desc *desc, u32 features,
463 struct nft_set_estimate *est)
464 {
465 est->size = ~0;
466 est->lookup = NFT_SET_CLASS_O_1;
467 est->space = NFT_SET_CLASS_O_N;
468
469 return true;
470 }
471
472 struct nft_hash {
473 u32 seed;
474 u32 buckets;
475 struct hlist_head table[];
476 };
477
478 struct nft_hash_elem {
479 struct hlist_node node;
480 struct nft_set_ext ext;
481 };
482
483 INDIRECT_CALLABLE_SCOPE
nft_hash_lookup(const struct net * net,const struct nft_set * set,const u32 * key,const struct nft_set_ext ** ext)484 bool nft_hash_lookup(const struct net *net, const struct nft_set *set,
485 const u32 *key, const struct nft_set_ext **ext)
486 {
487 struct nft_hash *priv = nft_set_priv(set);
488 u8 genmask = nft_genmask_cur(net);
489 const struct nft_hash_elem *he;
490 u32 hash;
491
492 hash = jhash(key, set->klen, priv->seed);
493 hash = reciprocal_scale(hash, priv->buckets);
494 hlist_for_each_entry_rcu(he, &priv->table[hash], node) {
495 if (!memcmp(nft_set_ext_key(&he->ext), key, set->klen) &&
496 nft_set_elem_active(&he->ext, genmask)) {
497 *ext = &he->ext;
498 return true;
499 }
500 }
501 return false;
502 }
503
nft_hash_get(const struct net * net,const struct nft_set * set,const struct nft_set_elem * elem,unsigned int flags)504 static void *nft_hash_get(const struct net *net, const struct nft_set *set,
505 const struct nft_set_elem *elem, unsigned int flags)
506 {
507 struct nft_hash *priv = nft_set_priv(set);
508 u8 genmask = nft_genmask_cur(net);
509 struct nft_hash_elem *he;
510 u32 hash;
511
512 hash = jhash(elem->key.val.data, set->klen, priv->seed);
513 hash = reciprocal_scale(hash, priv->buckets);
514 hlist_for_each_entry_rcu(he, &priv->table[hash], node) {
515 if (!memcmp(nft_set_ext_key(&he->ext), elem->key.val.data, set->klen) &&
516 nft_set_elem_active(&he->ext, genmask))
517 return he;
518 }
519 return ERR_PTR(-ENOENT);
520 }
521
522 INDIRECT_CALLABLE_SCOPE
nft_hash_lookup_fast(const struct net * net,const struct nft_set * set,const u32 * key,const struct nft_set_ext ** ext)523 bool nft_hash_lookup_fast(const struct net *net,
524 const struct nft_set *set,
525 const u32 *key, const struct nft_set_ext **ext)
526 {
527 struct nft_hash *priv = nft_set_priv(set);
528 u8 genmask = nft_genmask_cur(net);
529 const struct nft_hash_elem *he;
530 u32 hash, k1, k2;
531
532 k1 = *key;
533 hash = jhash_1word(k1, priv->seed);
534 hash = reciprocal_scale(hash, priv->buckets);
535 hlist_for_each_entry_rcu(he, &priv->table[hash], node) {
536 k2 = *(u32 *)nft_set_ext_key(&he->ext)->data;
537 if (k1 == k2 &&
538 nft_set_elem_active(&he->ext, genmask)) {
539 *ext = &he->ext;
540 return true;
541 }
542 }
543 return false;
544 }
545
nft_jhash(const struct nft_set * set,const struct nft_hash * priv,const struct nft_set_ext * ext)546 static u32 nft_jhash(const struct nft_set *set, const struct nft_hash *priv,
547 const struct nft_set_ext *ext)
548 {
549 const struct nft_data *key = nft_set_ext_key(ext);
550 u32 hash, k1;
551
552 if (set->klen == 4) {
553 k1 = *(u32 *)key;
554 hash = jhash_1word(k1, priv->seed);
555 } else {
556 hash = jhash(key, set->klen, priv->seed);
557 }
558 hash = reciprocal_scale(hash, priv->buckets);
559
560 return hash;
561 }
562
nft_hash_insert(const struct net * net,const struct nft_set * set,const struct nft_set_elem * elem,struct nft_set_ext ** ext)563 static int nft_hash_insert(const struct net *net, const struct nft_set *set,
564 const struct nft_set_elem *elem,
565 struct nft_set_ext **ext)
566 {
567 struct nft_hash_elem *this = elem->priv, *he;
568 struct nft_hash *priv = nft_set_priv(set);
569 u8 genmask = nft_genmask_next(net);
570 u32 hash;
571
572 hash = nft_jhash(set, priv, &this->ext);
573 hlist_for_each_entry(he, &priv->table[hash], node) {
574 if (!memcmp(nft_set_ext_key(&this->ext),
575 nft_set_ext_key(&he->ext), set->klen) &&
576 nft_set_elem_active(&he->ext, genmask)) {
577 *ext = &he->ext;
578 return -EEXIST;
579 }
580 }
581 hlist_add_head_rcu(&this->node, &priv->table[hash]);
582 return 0;
583 }
584
nft_hash_activate(const struct net * net,const struct nft_set * set,const struct nft_set_elem * elem)585 static void nft_hash_activate(const struct net *net, const struct nft_set *set,
586 const struct nft_set_elem *elem)
587 {
588 struct nft_hash_elem *he = elem->priv;
589
590 nft_set_elem_change_active(net, set, &he->ext);
591 }
592
nft_hash_flush(const struct net * net,const struct nft_set * set,void * priv)593 static bool nft_hash_flush(const struct net *net,
594 const struct nft_set *set, void *priv)
595 {
596 struct nft_hash_elem *he = priv;
597
598 nft_set_elem_change_active(net, set, &he->ext);
599 return true;
600 }
601
nft_hash_deactivate(const struct net * net,const struct nft_set * set,const struct nft_set_elem * elem)602 static void *nft_hash_deactivate(const struct net *net,
603 const struct nft_set *set,
604 const struct nft_set_elem *elem)
605 {
606 struct nft_hash *priv = nft_set_priv(set);
607 struct nft_hash_elem *this = elem->priv, *he;
608 u8 genmask = nft_genmask_next(net);
609 u32 hash;
610
611 hash = nft_jhash(set, priv, &this->ext);
612 hlist_for_each_entry(he, &priv->table[hash], node) {
613 if (!memcmp(nft_set_ext_key(&he->ext), &elem->key.val,
614 set->klen) &&
615 nft_set_elem_active(&he->ext, genmask)) {
616 nft_set_elem_change_active(net, set, &he->ext);
617 return he;
618 }
619 }
620 return NULL;
621 }
622
nft_hash_remove(const struct net * net,const struct nft_set * set,const struct nft_set_elem * elem)623 static void nft_hash_remove(const struct net *net,
624 const struct nft_set *set,
625 const struct nft_set_elem *elem)
626 {
627 struct nft_hash_elem *he = elem->priv;
628
629 hlist_del_rcu(&he->node);
630 }
631
nft_hash_walk(const struct nft_ctx * ctx,struct nft_set * set,struct nft_set_iter * iter)632 static void nft_hash_walk(const struct nft_ctx *ctx, struct nft_set *set,
633 struct nft_set_iter *iter)
634 {
635 struct nft_hash *priv = nft_set_priv(set);
636 struct nft_hash_elem *he;
637 struct nft_set_elem elem;
638 int i;
639
640 for (i = 0; i < priv->buckets; i++) {
641 hlist_for_each_entry_rcu(he, &priv->table[i], node) {
642 if (iter->count < iter->skip)
643 goto cont;
644 if (!nft_set_elem_active(&he->ext, iter->genmask))
645 goto cont;
646
647 elem.priv = he;
648
649 iter->err = iter->fn(ctx, set, iter, &elem);
650 if (iter->err < 0)
651 return;
652 cont:
653 iter->count++;
654 }
655 }
656 }
657
nft_hash_privsize(const struct nlattr * const nla[],const struct nft_set_desc * desc)658 static u64 nft_hash_privsize(const struct nlattr * const nla[],
659 const struct nft_set_desc *desc)
660 {
661 return sizeof(struct nft_hash) +
662 (u64)nft_hash_buckets(desc->size) * sizeof(struct hlist_head);
663 }
664
nft_hash_init(const struct nft_set * set,const struct nft_set_desc * desc,const struct nlattr * const tb[])665 static int nft_hash_init(const struct nft_set *set,
666 const struct nft_set_desc *desc,
667 const struct nlattr * const tb[])
668 {
669 struct nft_hash *priv = nft_set_priv(set);
670
671 priv->buckets = nft_hash_buckets(desc->size);
672 get_random_bytes(&priv->seed, sizeof(priv->seed));
673
674 return 0;
675 }
676
nft_hash_destroy(const struct nft_ctx * ctx,const struct nft_set * set)677 static void nft_hash_destroy(const struct nft_ctx *ctx,
678 const struct nft_set *set)
679 {
680 struct nft_hash *priv = nft_set_priv(set);
681 struct nft_hash_elem *he;
682 struct hlist_node *next;
683 int i;
684
685 for (i = 0; i < priv->buckets; i++) {
686 hlist_for_each_entry_safe(he, next, &priv->table[i], node) {
687 hlist_del_rcu(&he->node);
688 nf_tables_set_elem_destroy(ctx, set, he);
689 }
690 }
691 }
692
nft_hash_estimate(const struct nft_set_desc * desc,u32 features,struct nft_set_estimate * est)693 static bool nft_hash_estimate(const struct nft_set_desc *desc, u32 features,
694 struct nft_set_estimate *est)
695 {
696 if (!desc->size)
697 return false;
698
699 if (desc->klen == 4)
700 return false;
701
702 est->size = sizeof(struct nft_hash) +
703 (u64)nft_hash_buckets(desc->size) * sizeof(struct hlist_head) +
704 (u64)desc->size * sizeof(struct nft_hash_elem);
705 est->lookup = NFT_SET_CLASS_O_1;
706 est->space = NFT_SET_CLASS_O_N;
707
708 return true;
709 }
710
nft_hash_fast_estimate(const struct nft_set_desc * desc,u32 features,struct nft_set_estimate * est)711 static bool nft_hash_fast_estimate(const struct nft_set_desc *desc, u32 features,
712 struct nft_set_estimate *est)
713 {
714 if (!desc->size)
715 return false;
716
717 if (desc->klen != 4)
718 return false;
719
720 est->size = sizeof(struct nft_hash) +
721 (u64)nft_hash_buckets(desc->size) * sizeof(struct hlist_head) +
722 (u64)desc->size * sizeof(struct nft_hash_elem);
723 est->lookup = NFT_SET_CLASS_O_1;
724 est->space = NFT_SET_CLASS_O_N;
725
726 return true;
727 }
728
729 const struct nft_set_type nft_set_rhash_type = {
730 .features = NFT_SET_MAP | NFT_SET_OBJECT |
731 NFT_SET_TIMEOUT | NFT_SET_EVAL,
732 .ops = {
733 .privsize = nft_rhash_privsize,
734 .elemsize = offsetof(struct nft_rhash_elem, ext),
735 .estimate = nft_rhash_estimate,
736 .init = nft_rhash_init,
737 .gc_init = nft_rhash_gc_init,
738 .destroy = nft_rhash_destroy,
739 .insert = nft_rhash_insert,
740 .activate = nft_rhash_activate,
741 .deactivate = nft_rhash_deactivate,
742 .flush = nft_rhash_flush,
743 .remove = nft_rhash_remove,
744 .lookup = nft_rhash_lookup,
745 .update = nft_rhash_update,
746 .delete = nft_rhash_delete,
747 .walk = nft_rhash_walk,
748 .get = nft_rhash_get,
749 },
750 };
751
752 const struct nft_set_type nft_set_hash_type = {
753 .features = NFT_SET_MAP | NFT_SET_OBJECT,
754 .ops = {
755 .privsize = nft_hash_privsize,
756 .elemsize = offsetof(struct nft_hash_elem, ext),
757 .estimate = nft_hash_estimate,
758 .init = nft_hash_init,
759 .destroy = nft_hash_destroy,
760 .insert = nft_hash_insert,
761 .activate = nft_hash_activate,
762 .deactivate = nft_hash_deactivate,
763 .flush = nft_hash_flush,
764 .remove = nft_hash_remove,
765 .lookup = nft_hash_lookup,
766 .walk = nft_hash_walk,
767 .get = nft_hash_get,
768 },
769 };
770
771 const struct nft_set_type nft_set_hash_fast_type = {
772 .features = NFT_SET_MAP | NFT_SET_OBJECT,
773 .ops = {
774 .privsize = nft_hash_privsize,
775 .elemsize = offsetof(struct nft_hash_elem, ext),
776 .estimate = nft_hash_fast_estimate,
777 .init = nft_hash_init,
778 .destroy = nft_hash_destroy,
779 .insert = nft_hash_insert,
780 .activate = nft_hash_activate,
781 .deactivate = nft_hash_deactivate,
782 .flush = nft_hash_flush,
783 .remove = nft_hash_remove,
784 .lookup = nft_hash_lookup_fast,
785 .walk = nft_hash_walk,
786 .get = nft_hash_get,
787 },
788 };
789