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 nft_elem_priv priv; |
31 | struct rhash_head node; |
32 | struct nft_set_ext ext; |
33 | }; |
34 | |
35 | struct nft_rhash_cmp_arg { |
36 | const struct nft_set *set; |
37 | const u32 *key; |
38 | u8 genmask; |
39 | u64 tstamp; |
40 | }; |
41 | |
42 | static inline u32 nft_rhash_key(const void *data, u32 len, u32 seed) |
43 | { |
44 | const struct nft_rhash_cmp_arg *arg = data; |
45 | |
46 | return jhash(key: arg->key, length: len, initval: seed); |
47 | } |
48 | |
49 | static inline u32 nft_rhash_obj(const void *data, u32 len, u32 seed) |
50 | { |
51 | const struct nft_rhash_elem *he = data; |
52 | |
53 | return jhash(key: nft_set_ext_key(ext: &he->ext), length: len, initval: seed); |
54 | } |
55 | |
56 | static inline int nft_rhash_cmp(struct rhashtable_compare_arg *arg, |
57 | const void *ptr) |
58 | { |
59 | const struct nft_rhash_cmp_arg *x = arg->key; |
60 | const struct nft_rhash_elem *he = ptr; |
61 | |
62 | if (memcmp(p: nft_set_ext_key(ext: &he->ext), q: x->key, size: x->set->klen)) |
63 | return 1; |
64 | if (nft_set_elem_is_dead(ext: &he->ext)) |
65 | return 1; |
66 | if (__nft_set_elem_expired(ext: &he->ext, tstamp: x->tstamp)) |
67 | return 1; |
68 | if (!nft_set_elem_active(ext: &he->ext, genmask: x->genmask)) |
69 | return 1; |
70 | return 0; |
71 | } |
72 | |
73 | static const struct rhashtable_params nft_rhash_params = { |
74 | .head_offset = offsetof(struct nft_rhash_elem, node), |
75 | .hashfn = nft_rhash_key, |
76 | .obj_hashfn = nft_rhash_obj, |
77 | .obj_cmpfn = nft_rhash_cmp, |
78 | .automatic_shrinking = true, |
79 | }; |
80 | |
81 | INDIRECT_CALLABLE_SCOPE |
82 | bool nft_rhash_lookup(const struct net *net, const struct nft_set *set, |
83 | const u32 *key, const struct nft_set_ext **ext) |
84 | { |
85 | struct nft_rhash *priv = nft_set_priv(set); |
86 | const struct nft_rhash_elem *he; |
87 | struct nft_rhash_cmp_arg arg = { |
88 | .genmask = nft_genmask_cur(net), |
89 | .set = set, |
90 | .key = key, |
91 | .tstamp = get_jiffies_64(), |
92 | }; |
93 | |
94 | he = rhashtable_lookup(ht: &priv->ht, key: &arg, params: nft_rhash_params); |
95 | if (he != NULL) |
96 | *ext = &he->ext; |
97 | |
98 | return !!he; |
99 | } |
100 | |
101 | static struct nft_elem_priv * |
102 | nft_rhash_get(const struct net *net, const struct nft_set *set, |
103 | const struct nft_set_elem *elem, unsigned int flags) |
104 | { |
105 | struct nft_rhash *priv = nft_set_priv(set); |
106 | struct nft_rhash_elem *he; |
107 | struct nft_rhash_cmp_arg arg = { |
108 | .genmask = nft_genmask_cur(net), |
109 | .set = set, |
110 | .key = elem->key.val.data, |
111 | .tstamp = get_jiffies_64(), |
112 | }; |
113 | |
114 | he = rhashtable_lookup(ht: &priv->ht, key: &arg, params: nft_rhash_params); |
115 | if (he != NULL) |
116 | return &he->priv; |
117 | |
118 | return ERR_PTR(error: -ENOENT); |
119 | } |
120 | |
121 | static bool nft_rhash_update(struct nft_set *set, const u32 *key, |
122 | struct nft_elem_priv * |
123 | (*new)(struct nft_set *, |
124 | const struct nft_expr *, |
125 | struct nft_regs *regs), |
126 | const struct nft_expr *expr, |
127 | struct nft_regs *regs, |
128 | const struct nft_set_ext **ext) |
129 | { |
130 | struct nft_rhash *priv = nft_set_priv(set); |
131 | struct nft_rhash_elem *he, *prev; |
132 | struct nft_elem_priv *elem_priv; |
133 | struct nft_rhash_cmp_arg arg = { |
134 | .genmask = NFT_GENMASK_ANY, |
135 | .set = set, |
136 | .key = key, |
137 | .tstamp = get_jiffies_64(), |
138 | }; |
139 | |
140 | he = rhashtable_lookup(ht: &priv->ht, key: &arg, params: nft_rhash_params); |
141 | if (he != NULL) |
142 | goto out; |
143 | |
144 | elem_priv = new(set, expr, regs); |
145 | if (!elem_priv) |
146 | goto err1; |
147 | |
148 | he = nft_elem_priv_cast(priv: elem_priv); |
149 | prev = rhashtable_lookup_get_insert_key(ht: &priv->ht, key: &arg, obj: &he->node, |
150 | params: nft_rhash_params); |
151 | if (IS_ERR(ptr: prev)) |
152 | goto err2; |
153 | |
154 | /* Another cpu may race to insert the element with the same key */ |
155 | if (prev) { |
156 | nft_set_elem_destroy(set, elem_priv: &he->priv, destroy_expr: true); |
157 | atomic_dec(v: &set->nelems); |
158 | he = prev; |
159 | } |
160 | |
161 | out: |
162 | *ext = &he->ext; |
163 | return true; |
164 | |
165 | err2: |
166 | nft_set_elem_destroy(set, elem_priv: &he->priv, destroy_expr: true); |
167 | atomic_dec(v: &set->nelems); |
168 | err1: |
169 | return false; |
170 | } |
171 | |
172 | static int nft_rhash_insert(const struct net *net, const struct nft_set *set, |
173 | const struct nft_set_elem *elem, |
174 | struct nft_elem_priv **elem_priv) |
175 | { |
176 | struct nft_rhash_elem *he = nft_elem_priv_cast(priv: elem->priv); |
177 | struct nft_rhash *priv = nft_set_priv(set); |
178 | struct nft_rhash_cmp_arg arg = { |
179 | .genmask = nft_genmask_next(net), |
180 | .set = set, |
181 | .key = elem->key.val.data, |
182 | .tstamp = nft_net_tstamp(net), |
183 | }; |
184 | struct nft_rhash_elem *prev; |
185 | |
186 | prev = rhashtable_lookup_get_insert_key(ht: &priv->ht, key: &arg, obj: &he->node, |
187 | params: nft_rhash_params); |
188 | if (IS_ERR(ptr: prev)) |
189 | return PTR_ERR(ptr: prev); |
190 | if (prev) { |
191 | *elem_priv = &prev->priv; |
192 | return -EEXIST; |
193 | } |
194 | return 0; |
195 | } |
196 | |
197 | static void nft_rhash_activate(const struct net *net, const struct nft_set *set, |
198 | struct nft_elem_priv *elem_priv) |
199 | { |
200 | struct nft_rhash_elem *he = nft_elem_priv_cast(priv: elem_priv); |
201 | |
202 | nft_clear(net, &he->ext); |
203 | } |
204 | |
205 | static void nft_rhash_flush(const struct net *net, |
206 | const struct nft_set *set, |
207 | struct nft_elem_priv *elem_priv) |
208 | { |
209 | struct nft_rhash_elem *he = nft_elem_priv_cast(priv: elem_priv); |
210 | |
211 | nft_set_elem_change_active(net, set, ext: &he->ext); |
212 | } |
213 | |
214 | static struct nft_elem_priv * |
215 | nft_rhash_deactivate(const struct net *net, const struct nft_set *set, |
216 | const struct nft_set_elem *elem) |
217 | { |
218 | struct nft_rhash *priv = nft_set_priv(set); |
219 | struct nft_rhash_elem *he; |
220 | struct nft_rhash_cmp_arg arg = { |
221 | .genmask = nft_genmask_next(net), |
222 | .set = set, |
223 | .key = elem->key.val.data, |
224 | .tstamp = nft_net_tstamp(net), |
225 | }; |
226 | |
227 | rcu_read_lock(); |
228 | he = rhashtable_lookup(ht: &priv->ht, key: &arg, params: nft_rhash_params); |
229 | if (he) |
230 | nft_set_elem_change_active(net, set, ext: &he->ext); |
231 | |
232 | rcu_read_unlock(); |
233 | |
234 | return &he->priv; |
235 | } |
236 | |
237 | static void nft_rhash_remove(const struct net *net, |
238 | const struct nft_set *set, |
239 | struct nft_elem_priv *elem_priv) |
240 | { |
241 | struct nft_rhash_elem *he = nft_elem_priv_cast(priv: elem_priv); |
242 | struct nft_rhash *priv = nft_set_priv(set); |
243 | |
244 | rhashtable_remove_fast(ht: &priv->ht, obj: &he->node, params: nft_rhash_params); |
245 | } |
246 | |
247 | static bool nft_rhash_delete(const struct nft_set *set, |
248 | const u32 *key) |
249 | { |
250 | struct nft_rhash *priv = nft_set_priv(set); |
251 | struct nft_rhash_cmp_arg arg = { |
252 | .genmask = NFT_GENMASK_ANY, |
253 | .set = set, |
254 | .key = key, |
255 | }; |
256 | struct nft_rhash_elem *he; |
257 | |
258 | he = rhashtable_lookup(ht: &priv->ht, key: &arg, params: nft_rhash_params); |
259 | if (he == NULL) |
260 | return false; |
261 | |
262 | nft_set_elem_dead(ext: &he->ext); |
263 | |
264 | return true; |
265 | } |
266 | |
267 | static void nft_rhash_walk(const struct nft_ctx *ctx, struct nft_set *set, |
268 | struct nft_set_iter *iter) |
269 | { |
270 | struct nft_rhash *priv = nft_set_priv(set); |
271 | struct nft_rhash_elem *he; |
272 | struct rhashtable_iter hti; |
273 | |
274 | rhashtable_walk_enter(ht: &priv->ht, iter: &hti); |
275 | rhashtable_walk_start(iter: &hti); |
276 | |
277 | while ((he = rhashtable_walk_next(iter: &hti))) { |
278 | if (IS_ERR(ptr: he)) { |
279 | if (PTR_ERR(ptr: he) != -EAGAIN) { |
280 | iter->err = PTR_ERR(ptr: he); |
281 | break; |
282 | } |
283 | |
284 | continue; |
285 | } |
286 | |
287 | if (iter->count < iter->skip) |
288 | goto cont; |
289 | |
290 | iter->err = iter->fn(ctx, set, iter, &he->priv); |
291 | if (iter->err < 0) |
292 | break; |
293 | |
294 | cont: |
295 | iter->count++; |
296 | } |
297 | rhashtable_walk_stop(iter: &hti); |
298 | rhashtable_walk_exit(iter: &hti); |
299 | } |
300 | |
301 | static bool nft_rhash_expr_needs_gc_run(const struct nft_set *set, |
302 | struct nft_set_ext *ext) |
303 | { |
304 | struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext); |
305 | struct nft_expr *expr; |
306 | u32 size; |
307 | |
308 | nft_setelem_expr_foreach(expr, elem_expr, size) { |
309 | if (expr->ops->gc && |
310 | expr->ops->gc(read_pnet(pnet: &set->net), expr)) |
311 | return true; |
312 | } |
313 | |
314 | return false; |
315 | } |
316 | |
317 | static void nft_rhash_gc(struct work_struct *work) |
318 | { |
319 | struct nftables_pernet *nft_net; |
320 | struct nft_set *set; |
321 | struct nft_rhash_elem *he; |
322 | struct nft_rhash *priv; |
323 | struct rhashtable_iter hti; |
324 | struct nft_trans_gc *gc; |
325 | struct net *net; |
326 | u32 gc_seq; |
327 | |
328 | priv = container_of(work, struct nft_rhash, gc_work.work); |
329 | set = nft_set_container_of(priv); |
330 | net = read_pnet(pnet: &set->net); |
331 | nft_net = nft_pernet(net); |
332 | gc_seq = READ_ONCE(nft_net->gc_seq); |
333 | |
334 | if (nft_set_gc_is_pending(s: set)) |
335 | goto done; |
336 | |
337 | gc = nft_trans_gc_alloc(set, gc_seq, GFP_KERNEL); |
338 | if (!gc) |
339 | goto done; |
340 | |
341 | rhashtable_walk_enter(ht: &priv->ht, iter: &hti); |
342 | rhashtable_walk_start(iter: &hti); |
343 | |
344 | while ((he = rhashtable_walk_next(iter: &hti))) { |
345 | if (IS_ERR(ptr: he)) { |
346 | nft_trans_gc_destroy(trans: gc); |
347 | gc = NULL; |
348 | goto try_later; |
349 | } |
350 | |
351 | /* Ruleset has been updated, try later. */ |
352 | if (READ_ONCE(nft_net->gc_seq) != gc_seq) { |
353 | nft_trans_gc_destroy(trans: gc); |
354 | gc = NULL; |
355 | goto try_later; |
356 | } |
357 | |
358 | if (nft_set_elem_is_dead(ext: &he->ext)) |
359 | goto dead_elem; |
360 | |
361 | if (nft_set_ext_exists(ext: &he->ext, id: NFT_SET_EXT_EXPRESSIONS) && |
362 | nft_rhash_expr_needs_gc_run(set, ext: &he->ext)) |
363 | goto needs_gc_run; |
364 | |
365 | if (!nft_set_elem_expired(ext: &he->ext)) |
366 | continue; |
367 | needs_gc_run: |
368 | nft_set_elem_dead(ext: &he->ext); |
369 | dead_elem: |
370 | gc = nft_trans_gc_queue_async(gc, gc_seq, GFP_ATOMIC); |
371 | if (!gc) |
372 | goto try_later; |
373 | |
374 | nft_trans_gc_elem_add(gc, priv: he); |
375 | } |
376 | |
377 | gc = nft_trans_gc_catchall_async(gc, gc_seq); |
378 | |
379 | try_later: |
380 | /* catchall list iteration requires rcu read side lock. */ |
381 | rhashtable_walk_stop(iter: &hti); |
382 | rhashtable_walk_exit(iter: &hti); |
383 | |
384 | if (gc) |
385 | nft_trans_gc_queue_async_done(gc); |
386 | |
387 | done: |
388 | queue_delayed_work(wq: system_power_efficient_wq, dwork: &priv->gc_work, |
389 | delay: nft_set_gc_interval(set)); |
390 | } |
391 | |
392 | static u64 nft_rhash_privsize(const struct nlattr * const nla[], |
393 | const struct nft_set_desc *desc) |
394 | { |
395 | return sizeof(struct nft_rhash); |
396 | } |
397 | |
398 | static void nft_rhash_gc_init(const struct nft_set *set) |
399 | { |
400 | struct nft_rhash *priv = nft_set_priv(set); |
401 | |
402 | queue_delayed_work(wq: system_power_efficient_wq, dwork: &priv->gc_work, |
403 | delay: nft_set_gc_interval(set)); |
404 | } |
405 | |
406 | static int nft_rhash_init(const struct nft_set *set, |
407 | const struct nft_set_desc *desc, |
408 | const struct nlattr * const tb[]) |
409 | { |
410 | struct nft_rhash *priv = nft_set_priv(set); |
411 | struct rhashtable_params params = nft_rhash_params; |
412 | int err; |
413 | |
414 | BUILD_BUG_ON(offsetof(struct nft_rhash_elem, priv) != 0); |
415 | |
416 | params.nelem_hint = desc->size ?: NFT_RHASH_ELEMENT_HINT; |
417 | params.key_len = set->klen; |
418 | |
419 | err = rhashtable_init(ht: &priv->ht, params: ¶ms); |
420 | if (err < 0) |
421 | return err; |
422 | |
423 | INIT_DEFERRABLE_WORK(&priv->gc_work, nft_rhash_gc); |
424 | if (set->flags & (NFT_SET_TIMEOUT | NFT_SET_EVAL)) |
425 | nft_rhash_gc_init(set); |
426 | |
427 | return 0; |
428 | } |
429 | |
430 | struct nft_rhash_ctx { |
431 | const struct nft_ctx ctx; |
432 | const struct nft_set *set; |
433 | }; |
434 | |
435 | static void nft_rhash_elem_destroy(void *ptr, void *arg) |
436 | { |
437 | struct nft_rhash_ctx *rhash_ctx = arg; |
438 | struct nft_rhash_elem *he = ptr; |
439 | |
440 | nf_tables_set_elem_destroy(ctx: &rhash_ctx->ctx, set: rhash_ctx->set, elem_priv: &he->priv); |
441 | } |
442 | |
443 | static void nft_rhash_destroy(const struct nft_ctx *ctx, |
444 | const struct nft_set *set) |
445 | { |
446 | struct nft_rhash *priv = nft_set_priv(set); |
447 | struct nft_rhash_ctx rhash_ctx = { |
448 | .ctx = *ctx, |
449 | .set = set, |
450 | }; |
451 | |
452 | cancel_delayed_work_sync(dwork: &priv->gc_work); |
453 | rhashtable_free_and_destroy(ht: &priv->ht, free_fn: nft_rhash_elem_destroy, |
454 | arg: (void *)&rhash_ctx); |
455 | } |
456 | |
457 | /* Number of buckets is stored in u32, so cap our result to 1U<<31 */ |
458 | #define NFT_MAX_BUCKETS (1U << 31) |
459 | |
460 | static u32 nft_hash_buckets(u32 size) |
461 | { |
462 | u64 val = div_u64(dividend: (u64)size * 4, divisor: 3); |
463 | |
464 | if (val >= NFT_MAX_BUCKETS) |
465 | return NFT_MAX_BUCKETS; |
466 | |
467 | return roundup_pow_of_two(val); |
468 | } |
469 | |
470 | static bool nft_rhash_estimate(const struct nft_set_desc *desc, u32 features, |
471 | struct nft_set_estimate *est) |
472 | { |
473 | est->size = ~0; |
474 | est->lookup = NFT_SET_CLASS_O_1; |
475 | est->space = NFT_SET_CLASS_O_N; |
476 | |
477 | return true; |
478 | } |
479 | |
480 | struct nft_hash { |
481 | u32 seed; |
482 | u32 buckets; |
483 | struct hlist_head table[]; |
484 | }; |
485 | |
486 | struct nft_hash_elem { |
487 | struct nft_elem_priv priv; |
488 | struct hlist_node node; |
489 | struct nft_set_ext ext; |
490 | }; |
491 | |
492 | INDIRECT_CALLABLE_SCOPE |
493 | bool nft_hash_lookup(const struct net *net, 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; |
500 | |
501 | hash = jhash(key, length: set->klen, initval: priv->seed); |
502 | hash = reciprocal_scale(val: hash, ep_ro: priv->buckets); |
503 | hlist_for_each_entry_rcu(he, &priv->table[hash], node) { |
504 | if (!memcmp(p: nft_set_ext_key(ext: &he->ext), q: key, size: set->klen) && |
505 | nft_set_elem_active(ext: &he->ext, genmask)) { |
506 | *ext = &he->ext; |
507 | return true; |
508 | } |
509 | } |
510 | return false; |
511 | } |
512 | |
513 | static struct nft_elem_priv * |
514 | nft_hash_get(const struct net *net, const struct nft_set *set, |
515 | const struct nft_set_elem *elem, unsigned int flags) |
516 | { |
517 | struct nft_hash *priv = nft_set_priv(set); |
518 | u8 genmask = nft_genmask_cur(net); |
519 | struct nft_hash_elem *he; |
520 | u32 hash; |
521 | |
522 | hash = jhash(key: elem->key.val.data, length: set->klen, initval: priv->seed); |
523 | hash = reciprocal_scale(val: hash, ep_ro: priv->buckets); |
524 | hlist_for_each_entry_rcu(he, &priv->table[hash], node) { |
525 | if (!memcmp(p: nft_set_ext_key(ext: &he->ext), q: elem->key.val.data, size: set->klen) && |
526 | nft_set_elem_active(ext: &he->ext, genmask)) |
527 | return &he->priv; |
528 | } |
529 | return ERR_PTR(error: -ENOENT); |
530 | } |
531 | |
532 | INDIRECT_CALLABLE_SCOPE |
533 | bool nft_hash_lookup_fast(const struct net *net, |
534 | const struct nft_set *set, |
535 | const u32 *key, const struct nft_set_ext **ext) |
536 | { |
537 | struct nft_hash *priv = nft_set_priv(set); |
538 | u8 genmask = nft_genmask_cur(net); |
539 | const struct nft_hash_elem *he; |
540 | u32 hash, k1, k2; |
541 | |
542 | k1 = *key; |
543 | hash = jhash_1word(a: k1, initval: priv->seed); |
544 | hash = reciprocal_scale(val: hash, ep_ro: priv->buckets); |
545 | hlist_for_each_entry_rcu(he, &priv->table[hash], node) { |
546 | k2 = *(u32 *)nft_set_ext_key(ext: &he->ext)->data; |
547 | if (k1 == k2 && |
548 | nft_set_elem_active(ext: &he->ext, genmask)) { |
549 | *ext = &he->ext; |
550 | return true; |
551 | } |
552 | } |
553 | return false; |
554 | } |
555 | |
556 | static u32 nft_jhash(const struct nft_set *set, const struct nft_hash *priv, |
557 | const struct nft_set_ext *ext) |
558 | { |
559 | const struct nft_data *key = nft_set_ext_key(ext); |
560 | u32 hash, k1; |
561 | |
562 | if (set->klen == 4) { |
563 | k1 = *(u32 *)key; |
564 | hash = jhash_1word(a: k1, initval: priv->seed); |
565 | } else { |
566 | hash = jhash(key, length: set->klen, initval: priv->seed); |
567 | } |
568 | hash = reciprocal_scale(val: hash, ep_ro: priv->buckets); |
569 | |
570 | return hash; |
571 | } |
572 | |
573 | static int nft_hash_insert(const struct net *net, const struct nft_set *set, |
574 | const struct nft_set_elem *elem, |
575 | struct nft_elem_priv **elem_priv) |
576 | { |
577 | struct nft_hash_elem *this = nft_elem_priv_cast(priv: elem->priv), *he; |
578 | struct nft_hash *priv = nft_set_priv(set); |
579 | u8 genmask = nft_genmask_next(net); |
580 | u32 hash; |
581 | |
582 | hash = nft_jhash(set, priv, ext: &this->ext); |
583 | hlist_for_each_entry(he, &priv->table[hash], node) { |
584 | if (!memcmp(p: nft_set_ext_key(ext: &this->ext), |
585 | q: nft_set_ext_key(ext: &he->ext), size: set->klen) && |
586 | nft_set_elem_active(ext: &he->ext, genmask)) { |
587 | *elem_priv = &he->priv; |
588 | return -EEXIST; |
589 | } |
590 | } |
591 | hlist_add_head_rcu(n: &this->node, h: &priv->table[hash]); |
592 | return 0; |
593 | } |
594 | |
595 | static void nft_hash_activate(const struct net *net, const struct nft_set *set, |
596 | struct nft_elem_priv *elem_priv) |
597 | { |
598 | struct nft_hash_elem *he = nft_elem_priv_cast(priv: elem_priv); |
599 | |
600 | nft_clear(net, &he->ext); |
601 | } |
602 | |
603 | static void nft_hash_flush(const struct net *net, |
604 | const struct nft_set *set, |
605 | struct nft_elem_priv *elem_priv) |
606 | { |
607 | struct nft_hash_elem *he = nft_elem_priv_cast(priv: elem_priv); |
608 | |
609 | nft_set_elem_change_active(net, set, ext: &he->ext); |
610 | } |
611 | |
612 | static struct nft_elem_priv * |
613 | nft_hash_deactivate(const struct net *net, const struct nft_set *set, |
614 | const struct nft_set_elem *elem) |
615 | { |
616 | struct nft_hash_elem *this = nft_elem_priv_cast(priv: elem->priv), *he; |
617 | struct nft_hash *priv = nft_set_priv(set); |
618 | u8 genmask = nft_genmask_next(net); |
619 | u32 hash; |
620 | |
621 | hash = nft_jhash(set, priv, ext: &this->ext); |
622 | hlist_for_each_entry(he, &priv->table[hash], node) { |
623 | if (!memcmp(p: nft_set_ext_key(ext: &he->ext), q: &elem->key.val, |
624 | size: set->klen) && |
625 | nft_set_elem_active(ext: &he->ext, genmask)) { |
626 | nft_set_elem_change_active(net, set, ext: &he->ext); |
627 | return &he->priv; |
628 | } |
629 | } |
630 | return NULL; |
631 | } |
632 | |
633 | static void nft_hash_remove(const struct net *net, |
634 | const struct nft_set *set, |
635 | struct nft_elem_priv *elem_priv) |
636 | { |
637 | struct nft_hash_elem *he = nft_elem_priv_cast(priv: elem_priv); |
638 | |
639 | hlist_del_rcu(n: &he->node); |
640 | } |
641 | |
642 | static void nft_hash_walk(const struct nft_ctx *ctx, struct nft_set *set, |
643 | struct nft_set_iter *iter) |
644 | { |
645 | struct nft_hash *priv = nft_set_priv(set); |
646 | struct nft_hash_elem *he; |
647 | int i; |
648 | |
649 | for (i = 0; i < priv->buckets; i++) { |
650 | hlist_for_each_entry_rcu(he, &priv->table[i], node) { |
651 | if (iter->count < iter->skip) |
652 | goto cont; |
653 | |
654 | iter->err = iter->fn(ctx, set, iter, &he->priv); |
655 | if (iter->err < 0) |
656 | return; |
657 | cont: |
658 | iter->count++; |
659 | } |
660 | } |
661 | } |
662 | |
663 | static u64 nft_hash_privsize(const struct nlattr * const nla[], |
664 | const struct nft_set_desc *desc) |
665 | { |
666 | return sizeof(struct nft_hash) + |
667 | (u64)nft_hash_buckets(size: desc->size) * sizeof(struct hlist_head); |
668 | } |
669 | |
670 | static int nft_hash_init(const struct nft_set *set, |
671 | const struct nft_set_desc *desc, |
672 | const struct nlattr * const tb[]) |
673 | { |
674 | struct nft_hash *priv = nft_set_priv(set); |
675 | |
676 | priv->buckets = nft_hash_buckets(size: desc->size); |
677 | get_random_bytes(buf: &priv->seed, len: sizeof(priv->seed)); |
678 | |
679 | return 0; |
680 | } |
681 | |
682 | static void nft_hash_destroy(const struct nft_ctx *ctx, |
683 | const struct nft_set *set) |
684 | { |
685 | struct nft_hash *priv = nft_set_priv(set); |
686 | struct nft_hash_elem *he; |
687 | struct hlist_node *next; |
688 | int i; |
689 | |
690 | for (i = 0; i < priv->buckets; i++) { |
691 | hlist_for_each_entry_safe(he, next, &priv->table[i], node) { |
692 | hlist_del_rcu(n: &he->node); |
693 | nf_tables_set_elem_destroy(ctx, set, elem_priv: &he->priv); |
694 | } |
695 | } |
696 | } |
697 | |
698 | static bool nft_hash_estimate(const struct nft_set_desc *desc, u32 features, |
699 | struct nft_set_estimate *est) |
700 | { |
701 | if (!desc->size) |
702 | return false; |
703 | |
704 | if (desc->klen == 4) |
705 | return false; |
706 | |
707 | est->size = sizeof(struct nft_hash) + |
708 | (u64)nft_hash_buckets(size: desc->size) * sizeof(struct hlist_head) + |
709 | (u64)desc->size * sizeof(struct nft_hash_elem); |
710 | est->lookup = NFT_SET_CLASS_O_1; |
711 | est->space = NFT_SET_CLASS_O_N; |
712 | |
713 | return true; |
714 | } |
715 | |
716 | static bool nft_hash_fast_estimate(const struct nft_set_desc *desc, u32 features, |
717 | struct nft_set_estimate *est) |
718 | { |
719 | if (!desc->size) |
720 | return false; |
721 | |
722 | if (desc->klen != 4) |
723 | return false; |
724 | |
725 | est->size = sizeof(struct nft_hash) + |
726 | (u64)nft_hash_buckets(size: desc->size) * sizeof(struct hlist_head) + |
727 | (u64)desc->size * sizeof(struct nft_hash_elem); |
728 | est->lookup = NFT_SET_CLASS_O_1; |
729 | est->space = NFT_SET_CLASS_O_N; |
730 | |
731 | return true; |
732 | } |
733 | |
734 | const struct nft_set_type nft_set_rhash_type = { |
735 | .features = NFT_SET_MAP | NFT_SET_OBJECT | |
736 | NFT_SET_TIMEOUT | NFT_SET_EVAL, |
737 | .ops = { |
738 | .privsize = nft_rhash_privsize, |
739 | .elemsize = offsetof(struct nft_rhash_elem, ext), |
740 | .estimate = nft_rhash_estimate, |
741 | .init = nft_rhash_init, |
742 | .gc_init = nft_rhash_gc_init, |
743 | .destroy = nft_rhash_destroy, |
744 | .insert = nft_rhash_insert, |
745 | .activate = nft_rhash_activate, |
746 | .deactivate = nft_rhash_deactivate, |
747 | .flush = nft_rhash_flush, |
748 | .remove = nft_rhash_remove, |
749 | .lookup = nft_rhash_lookup, |
750 | .update = nft_rhash_update, |
751 | .delete = nft_rhash_delete, |
752 | .walk = nft_rhash_walk, |
753 | .get = nft_rhash_get, |
754 | }, |
755 | }; |
756 | |
757 | const struct nft_set_type nft_set_hash_type = { |
758 | .features = NFT_SET_MAP | NFT_SET_OBJECT, |
759 | .ops = { |
760 | .privsize = nft_hash_privsize, |
761 | .elemsize = offsetof(struct nft_hash_elem, ext), |
762 | .estimate = nft_hash_estimate, |
763 | .init = nft_hash_init, |
764 | .destroy = nft_hash_destroy, |
765 | .insert = nft_hash_insert, |
766 | .activate = nft_hash_activate, |
767 | .deactivate = nft_hash_deactivate, |
768 | .flush = nft_hash_flush, |
769 | .remove = nft_hash_remove, |
770 | .lookup = nft_hash_lookup, |
771 | .walk = nft_hash_walk, |
772 | .get = nft_hash_get, |
773 | }, |
774 | }; |
775 | |
776 | const struct nft_set_type nft_set_hash_fast_type = { |
777 | .features = NFT_SET_MAP | NFT_SET_OBJECT, |
778 | .ops = { |
779 | .privsize = nft_hash_privsize, |
780 | .elemsize = offsetof(struct nft_hash_elem, ext), |
781 | .estimate = nft_hash_fast_estimate, |
782 | .init = nft_hash_init, |
783 | .destroy = nft_hash_destroy, |
784 | .insert = nft_hash_insert, |
785 | .activate = nft_hash_activate, |
786 | .deactivate = nft_hash_deactivate, |
787 | .flush = nft_hash_flush, |
788 | .remove = nft_hash_remove, |
789 | .lookup = nft_hash_lookup_fast, |
790 | .walk = nft_hash_walk, |
791 | .get = nft_hash_get, |
792 | }, |
793 | }; |
794 | |