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96518518 | 1 | /* |
ce6eb0d7 | 2 | * Copyright (c) 2008-2014 Patrick McHardy <kaber@trash.net> |
96518518 PM |
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> | |
c50b960c | 15 | #include <linux/log2.h> |
96518518 PM |
16 | #include <linux/jhash.h> |
17 | #include <linux/netlink.h> | |
9d098292 | 18 | #include <linux/workqueue.h> |
cfe4a9dd | 19 | #include <linux/rhashtable.h> |
96518518 PM |
20 | #include <linux/netfilter.h> |
21 | #include <linux/netfilter/nf_tables.h> | |
22 | #include <net/netfilter/nf_tables.h> | |
23 | ||
cfe4a9dd | 24 | /* We target a hash table size of 4, element hint is 75% of final size */ |
5fc6ced9 | 25 | #define NFT_RHASH_ELEMENT_HINT 3 |
96518518 | 26 | |
5fc6ced9 | 27 | struct nft_rhash { |
745f5450 | 28 | struct rhashtable ht; |
9d098292 | 29 | struct delayed_work gc_work; |
745f5450 PM |
30 | }; |
31 | ||
5fc6ced9 | 32 | struct nft_rhash_elem { |
cfe4a9dd | 33 | struct rhash_head node; |
fe2811eb | 34 | struct nft_set_ext ext; |
96518518 PM |
35 | }; |
36 | ||
5fc6ced9 | 37 | struct nft_rhash_cmp_arg { |
bfd6e327 | 38 | const struct nft_set *set; |
8cd8937a | 39 | const u32 *key; |
cc02e457 | 40 | u8 genmask; |
bfd6e327 PM |
41 | }; |
42 | ||
5fc6ced9 | 43 | static inline u32 nft_rhash_key(const void *data, u32 len, u32 seed) |
bfd6e327 | 44 | { |
5fc6ced9 | 45 | const struct nft_rhash_cmp_arg *arg = data; |
bfd6e327 PM |
46 | |
47 | return jhash(arg->key, len, seed); | |
48 | } | |
49 | ||
5fc6ced9 | 50 | static inline u32 nft_rhash_obj(const void *data, u32 len, u32 seed) |
bfd6e327 | 51 | { |
5fc6ced9 | 52 | const struct nft_rhash_elem *he = data; |
bfd6e327 | 53 | |
fe2811eb | 54 | return jhash(nft_set_ext_key(&he->ext), len, seed); |
bfd6e327 PM |
55 | } |
56 | ||
5fc6ced9 PNA |
57 | static inline int nft_rhash_cmp(struct rhashtable_compare_arg *arg, |
58 | const void *ptr) | |
bfd6e327 | 59 | { |
5fc6ced9 PNA |
60 | const struct nft_rhash_cmp_arg *x = arg->key; |
61 | const struct nft_rhash_elem *he = ptr; | |
bfd6e327 | 62 | |
e562d860 | 63 | if (memcmp(nft_set_ext_key(&he->ext), x->key, x->set->klen)) |
bfd6e327 | 64 | return 1; |
9d098292 PM |
65 | if (nft_set_elem_expired(&he->ext)) |
66 | return 1; | |
cc02e457 PM |
67 | if (!nft_set_elem_active(&he->ext, x->genmask)) |
68 | return 1; | |
bfd6e327 PM |
69 | return 0; |
70 | } | |
71 | ||
5fc6ced9 PNA |
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, | |
187388bc PNA |
77 | .automatic_shrinking = true, |
78 | }; | |
79 | ||
5fc6ced9 PNA |
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) | |
96518518 | 82 | { |
5fc6ced9 PNA |
83 | struct nft_rhash *priv = nft_set_priv(set); |
84 | const struct nft_rhash_elem *he; | |
85 | struct nft_rhash_cmp_arg arg = { | |
42a55769 | 86 | .genmask = nft_genmask_cur(net), |
bfd6e327 PM |
87 | .set = set, |
88 | .key = key, | |
89 | }; | |
ce6eb0d7 | 90 | |
5fc6ced9 | 91 | he = rhashtable_lookup_fast(&priv->ht, &arg, nft_rhash_params); |
b2832dd6 PM |
92 | if (he != NULL) |
93 | *ext = &he->ext; | |
ce6eb0d7 | 94 | |
cfe4a9dd | 95 | return !!he; |
96518518 PM |
96 | } |
97 | ||
5fc6ced9 PNA |
98 | static bool nft_rhash_update(struct nft_set *set, const u32 *key, |
99 | void *(*new)(struct nft_set *, | |
100 | const struct nft_expr *, | |
101 | struct nft_regs *regs), | |
102 | const struct nft_expr *expr, | |
103 | struct nft_regs *regs, | |
104 | const struct nft_set_ext **ext) | |
22fe54d5 | 105 | { |
5fc6ced9 PNA |
106 | struct nft_rhash *priv = nft_set_priv(set); |
107 | struct nft_rhash_elem *he, *prev; | |
108 | struct nft_rhash_cmp_arg arg = { | |
22fe54d5 PM |
109 | .genmask = NFT_GENMASK_ANY, |
110 | .set = set, | |
111 | .key = key, | |
112 | }; | |
113 | ||
5fc6ced9 | 114 | he = rhashtable_lookup_fast(&priv->ht, &arg, nft_rhash_params); |
22fe54d5 PM |
115 | if (he != NULL) |
116 | goto out; | |
117 | ||
a55e22e9 | 118 | he = new(set, expr, regs); |
22fe54d5 PM |
119 | if (he == NULL) |
120 | goto err1; | |
dab45060 LZ |
121 | |
122 | prev = rhashtable_lookup_get_insert_key(&priv->ht, &arg, &he->node, | |
5fc6ced9 | 123 | nft_rhash_params); |
dab45060 | 124 | if (IS_ERR(prev)) |
22fe54d5 | 125 | goto err2; |
dab45060 LZ |
126 | |
127 | /* Another cpu may race to insert the element with the same key */ | |
128 | if (prev) { | |
129 | nft_set_elem_destroy(set, he, true); | |
130 | he = prev; | |
131 | } | |
132 | ||
22fe54d5 PM |
133 | out: |
134 | *ext = &he->ext; | |
135 | return true; | |
136 | ||
137 | err2: | |
61f9e292 | 138 | nft_set_elem_destroy(set, he, true); |
22fe54d5 PM |
139 | err1: |
140 | return false; | |
141 | } | |
142 | ||
5fc6ced9 PNA |
143 | static int nft_rhash_insert(const struct net *net, const struct nft_set *set, |
144 | const struct nft_set_elem *elem, | |
145 | struct nft_set_ext **ext) | |
96518518 | 146 | { |
5fc6ced9 PNA |
147 | struct nft_rhash *priv = nft_set_priv(set); |
148 | struct nft_rhash_elem *he = elem->priv; | |
149 | struct nft_rhash_cmp_arg arg = { | |
42a55769 | 150 | .genmask = nft_genmask_next(net), |
bfd6e327 | 151 | .set = set, |
7d740264 | 152 | .key = elem->key.val.data, |
bfd6e327 | 153 | }; |
5fc6ced9 | 154 | struct nft_rhash_elem *prev; |
c016c7e4 PNA |
155 | |
156 | prev = rhashtable_lookup_get_insert_key(&priv->ht, &arg, &he->node, | |
5fc6ced9 | 157 | nft_rhash_params); |
c016c7e4 PNA |
158 | if (IS_ERR(prev)) |
159 | return PTR_ERR(prev); | |
160 | if (prev) { | |
161 | *ext = &prev->ext; | |
162 | return -EEXIST; | |
163 | } | |
164 | return 0; | |
96518518 PM |
165 | } |
166 | ||
5fc6ced9 PNA |
167 | static void nft_rhash_activate(const struct net *net, const struct nft_set *set, |
168 | const struct nft_set_elem *elem) | |
96518518 | 169 | { |
5fc6ced9 | 170 | struct nft_rhash_elem *he = elem->priv; |
ce6eb0d7 | 171 | |
42a55769 | 172 | nft_set_elem_change_active(net, set, &he->ext); |
9d098292 | 173 | nft_set_elem_clear_busy(&he->ext); |
20a69341 | 174 | } |
96518518 | 175 | |
5fc6ced9 PNA |
176 | static bool nft_rhash_flush(const struct net *net, |
177 | const struct nft_set *set, void *priv) | |
37df5301 | 178 | { |
5fc6ced9 | 179 | struct nft_rhash_elem *he = priv; |
37df5301 PNA |
180 | |
181 | if (!nft_set_elem_mark_busy(&he->ext) || | |
182 | !nft_is_active(net, &he->ext)) { | |
183 | nft_set_elem_change_active(net, set, &he->ext); | |
184 | return true; | |
185 | } | |
186 | return false; | |
187 | } | |
188 | ||
5fc6ced9 PNA |
189 | static void *nft_rhash_deactivate(const struct net *net, |
190 | const struct nft_set *set, | |
191 | const struct nft_set_elem *elem) | |
20a69341 | 192 | { |
5fc6ced9 PNA |
193 | struct nft_rhash *priv = nft_set_priv(set); |
194 | struct nft_rhash_elem *he; | |
195 | struct nft_rhash_cmp_arg arg = { | |
8eee54be | 196 | .genmask = nft_genmask_next(net), |
bfd6e327 | 197 | .set = set, |
7d740264 | 198 | .key = elem->key.val.data, |
bfd6e327 | 199 | }; |
fa377321 | 200 | |
9d098292 | 201 | rcu_read_lock(); |
5fc6ced9 | 202 | he = rhashtable_lookup_fast(&priv->ht, &arg, nft_rhash_params); |
37df5301 | 203 | if (he != NULL && |
5fc6ced9 | 204 | !nft_rhash_flush(net, set, he)) |
37df5301 PNA |
205 | he = NULL; |
206 | ||
9d098292 | 207 | rcu_read_unlock(); |
8d24c0b4 | 208 | |
cc02e457 PM |
209 | return he; |
210 | } | |
8d24c0b4 | 211 | |
5fc6ced9 PNA |
212 | static void nft_rhash_remove(const struct net *net, |
213 | const struct nft_set *set, | |
214 | const struct nft_set_elem *elem) | |
cc02e457 | 215 | { |
5fc6ced9 PNA |
216 | struct nft_rhash *priv = nft_set_priv(set); |
217 | struct nft_rhash_elem *he = elem->priv; | |
cc02e457 | 218 | |
5fc6ced9 | 219 | rhashtable_remove_fast(&priv->ht, &he->node, nft_rhash_params); |
96518518 PM |
220 | } |
221 | ||
5fc6ced9 PNA |
222 | static void nft_rhash_walk(const struct nft_ctx *ctx, struct nft_set *set, |
223 | struct nft_set_iter *iter) | |
96518518 | 224 | { |
5fc6ced9 PNA |
225 | struct nft_rhash *priv = nft_set_priv(set); |
226 | struct nft_rhash_elem *he; | |
9a776628 | 227 | struct rhashtable_iter hti; |
20a69341 | 228 | struct nft_set_elem elem; |
9a776628 | 229 | int err; |
96518518 | 230 | |
fa803605 | 231 | err = rhashtable_walk_init(&priv->ht, &hti, GFP_ATOMIC); |
9a776628 HX |
232 | iter->err = err; |
233 | if (err) | |
234 | return; | |
88d6ed15 | 235 | |
9a776628 HX |
236 | err = rhashtable_walk_start(&hti); |
237 | if (err && err != -EAGAIN) { | |
238 | iter->err = err; | |
239 | goto out; | |
240 | } | |
241 | ||
242 | while ((he = rhashtable_walk_next(&hti))) { | |
243 | if (IS_ERR(he)) { | |
244 | err = PTR_ERR(he); | |
245 | if (err != -EAGAIN) { | |
246 | iter->err = err; | |
247 | goto out; | |
248 | } | |
d8bdff59 HX |
249 | |
250 | continue; | |
9a776628 HX |
251 | } |
252 | ||
253 | if (iter->count < iter->skip) | |
254 | goto cont; | |
9d098292 PM |
255 | if (nft_set_elem_expired(&he->ext)) |
256 | goto cont; | |
8588ac09 | 257 | if (!nft_set_elem_active(&he->ext, iter->genmask)) |
cc02e457 | 258 | goto cont; |
20a69341 | 259 | |
fe2811eb | 260 | elem.priv = he; |
9a776628 HX |
261 | |
262 | iter->err = iter->fn(ctx, set, iter, &elem); | |
263 | if (iter->err < 0) | |
264 | goto out; | |
20a69341 | 265 | |
20a69341 | 266 | cont: |
9a776628 | 267 | iter->count++; |
96518518 | 268 | } |
9a776628 HX |
269 | |
270 | out: | |
271 | rhashtable_walk_stop(&hti); | |
272 | rhashtable_walk_exit(&hti); | |
96518518 PM |
273 | } |
274 | ||
5fc6ced9 | 275 | static void nft_rhash_gc(struct work_struct *work) |
9d098292 | 276 | { |
3dd0673a | 277 | struct nft_set *set; |
5fc6ced9 PNA |
278 | struct nft_rhash_elem *he; |
279 | struct nft_rhash *priv; | |
9d098292 PM |
280 | struct nft_set_gc_batch *gcb = NULL; |
281 | struct rhashtable_iter hti; | |
282 | int err; | |
283 | ||
5fc6ced9 | 284 | priv = container_of(work, struct nft_rhash, gc_work.work); |
9d098292 PM |
285 | set = nft_set_container_of(priv); |
286 | ||
8f6fd83c | 287 | err = rhashtable_walk_init(&priv->ht, &hti, GFP_KERNEL); |
9d098292 PM |
288 | if (err) |
289 | goto schedule; | |
290 | ||
291 | err = rhashtable_walk_start(&hti); | |
292 | if (err && err != -EAGAIN) | |
293 | goto out; | |
294 | ||
295 | while ((he = rhashtable_walk_next(&hti))) { | |
296 | if (IS_ERR(he)) { | |
297 | if (PTR_ERR(he) != -EAGAIN) | |
298 | goto out; | |
299 | continue; | |
300 | } | |
301 | ||
302 | if (!nft_set_elem_expired(&he->ext)) | |
303 | continue; | |
304 | if (nft_set_elem_mark_busy(&he->ext)) | |
305 | continue; | |
306 | ||
307 | gcb = nft_set_gc_batch_check(set, gcb, GFP_ATOMIC); | |
308 | if (gcb == NULL) | |
309 | goto out; | |
5fc6ced9 | 310 | rhashtable_remove_fast(&priv->ht, &he->node, nft_rhash_params); |
3dd0673a | 311 | atomic_dec(&set->nelems); |
9d098292 PM |
312 | nft_set_gc_batch_add(gcb, he); |
313 | } | |
314 | out: | |
315 | rhashtable_walk_stop(&hti); | |
316 | rhashtable_walk_exit(&hti); | |
317 | ||
318 | nft_set_gc_batch_complete(gcb); | |
319 | schedule: | |
320 | queue_delayed_work(system_power_efficient_wq, &priv->gc_work, | |
321 | nft_set_gc_interval(set)); | |
322 | } | |
323 | ||
347b408d PNA |
324 | static unsigned int nft_rhash_privsize(const struct nlattr * const nla[], |
325 | const struct nft_set_desc *desc) | |
20a69341 | 326 | { |
5fc6ced9 | 327 | return sizeof(struct nft_rhash); |
cfe4a9dd TG |
328 | } |
329 | ||
5fc6ced9 PNA |
330 | static int nft_rhash_init(const struct nft_set *set, |
331 | const struct nft_set_desc *desc, | |
332 | const struct nlattr * const tb[]) | |
96518518 | 333 | { |
5fc6ced9 PNA |
334 | struct nft_rhash *priv = nft_set_priv(set); |
335 | struct rhashtable_params params = nft_rhash_params; | |
9d098292 | 336 | int err; |
fa377321 | 337 | |
5fc6ced9 | 338 | params.nelem_hint = desc->size ?: NFT_RHASH_ELEMENT_HINT; |
45d84751 | 339 | params.key_len = set->klen; |
96518518 | 340 | |
9d098292 PM |
341 | err = rhashtable_init(&priv->ht, ¶ms); |
342 | if (err < 0) | |
343 | return err; | |
344 | ||
5fc6ced9 | 345 | INIT_DEFERRABLE_WORK(&priv->gc_work, nft_rhash_gc); |
9d098292 PM |
346 | if (set->flags & NFT_SET_TIMEOUT) |
347 | queue_delayed_work(system_power_efficient_wq, &priv->gc_work, | |
348 | nft_set_gc_interval(set)); | |
349 | return 0; | |
96518518 PM |
350 | } |
351 | ||
5fc6ced9 | 352 | static void nft_rhash_elem_destroy(void *ptr, void *arg) |
96518518 | 353 | { |
68ad546a | 354 | nft_set_elem_destroy(arg, ptr, true); |
6b6f302c | 355 | } |
97defe1e | 356 | |
5fc6ced9 | 357 | static void nft_rhash_destroy(const struct nft_set *set) |
6b6f302c | 358 | { |
5fc6ced9 | 359 | struct nft_rhash *priv = nft_set_priv(set); |
745f5450 | 360 | |
9d098292 | 361 | cancel_delayed_work_sync(&priv->gc_work); |
5fc6ced9 | 362 | rhashtable_free_and_destroy(&priv->ht, nft_rhash_elem_destroy, |
61edafbb | 363 | (void *)set); |
96518518 PM |
364 | } |
365 | ||
2111515a PNA |
366 | static u32 nft_hash_buckets(u32 size) |
367 | { | |
368 | return roundup_pow_of_two(size * 4 / 3); | |
369 | } | |
370 | ||
5fc6ced9 PNA |
371 | static bool nft_rhash_estimate(const struct nft_set_desc *desc, u32 features, |
372 | struct nft_set_estimate *est) | |
c50b960c | 373 | { |
6c03ae21 PNA |
374 | est->size = ~0; |
375 | est->lookup = NFT_SET_CLASS_O_1; | |
376 | est->space = NFT_SET_CLASS_O_N; | |
377 | ||
378 | return true; | |
379 | } | |
380 | ||
381 | struct nft_hash { | |
382 | u32 seed; | |
383 | u32 buckets; | |
384 | struct hlist_head table[]; | |
385 | }; | |
386 | ||
387 | struct nft_hash_elem { | |
388 | struct hlist_node node; | |
389 | struct nft_set_ext ext; | |
390 | }; | |
391 | ||
392 | static bool nft_hash_lookup(const struct net *net, const struct nft_set *set, | |
393 | const u32 *key, const struct nft_set_ext **ext) | |
394 | { | |
395 | struct nft_hash *priv = nft_set_priv(set); | |
396 | u8 genmask = nft_genmask_cur(net); | |
397 | const struct nft_hash_elem *he; | |
398 | u32 hash; | |
399 | ||
400 | hash = jhash(key, set->klen, priv->seed); | |
401 | hash = reciprocal_scale(hash, priv->buckets); | |
402 | hlist_for_each_entry_rcu(he, &priv->table[hash], node) { | |
403 | if (!memcmp(nft_set_ext_key(&he->ext), key, set->klen) && | |
404 | nft_set_elem_active(&he->ext, genmask)) { | |
405 | *ext = &he->ext; | |
406 | return true; | |
407 | } | |
408 | } | |
409 | return false; | |
410 | } | |
411 | ||
446a8268 PNA |
412 | /* nft_hash_select_ops() makes sure key size can be either 2 or 4 bytes . */ |
413 | static inline u32 nft_hash_key(const u32 *key, u32 klen) | |
414 | { | |
415 | if (klen == 4) | |
416 | return *key; | |
417 | ||
418 | return *(u16 *)key; | |
419 | } | |
420 | ||
421 | static bool nft_hash_lookup_fast(const struct net *net, | |
422 | const struct nft_set *set, | |
423 | const u32 *key, const struct nft_set_ext **ext) | |
424 | { | |
425 | struct nft_hash *priv = nft_set_priv(set); | |
426 | u8 genmask = nft_genmask_cur(net); | |
427 | const struct nft_hash_elem *he; | |
428 | u32 hash, k1, k2; | |
429 | ||
430 | k1 = nft_hash_key(key, set->klen); | |
431 | hash = jhash_1word(k1, priv->seed); | |
432 | hash = reciprocal_scale(hash, priv->buckets); | |
433 | hlist_for_each_entry_rcu(he, &priv->table[hash], node) { | |
434 | k2 = nft_hash_key(nft_set_ext_key(&he->ext)->data, set->klen); | |
435 | if (k1 == k2 && | |
436 | nft_set_elem_active(&he->ext, genmask)) { | |
437 | *ext = &he->ext; | |
438 | return true; | |
439 | } | |
440 | } | |
441 | return false; | |
442 | } | |
443 | ||
6c03ae21 PNA |
444 | static int nft_hash_insert(const struct net *net, const struct nft_set *set, |
445 | const struct nft_set_elem *elem, | |
446 | struct nft_set_ext **ext) | |
447 | { | |
448 | struct nft_hash_elem *this = elem->priv, *he; | |
449 | struct nft_hash *priv = nft_set_priv(set); | |
450 | u8 genmask = nft_genmask_next(net); | |
451 | u32 hash; | |
452 | ||
453 | hash = jhash(nft_set_ext_key(&this->ext), set->klen, priv->seed); | |
454 | hash = reciprocal_scale(hash, priv->buckets); | |
455 | hlist_for_each_entry(he, &priv->table[hash], node) { | |
456 | if (!memcmp(nft_set_ext_key(&this->ext), | |
457 | nft_set_ext_key(&he->ext), set->klen) && | |
458 | nft_set_elem_active(&he->ext, genmask)) { | |
459 | *ext = &he->ext; | |
460 | return -EEXIST; | |
461 | } | |
462 | } | |
463 | hlist_add_head_rcu(&this->node, &priv->table[hash]); | |
464 | return 0; | |
465 | } | |
466 | ||
467 | static void nft_hash_activate(const struct net *net, const struct nft_set *set, | |
468 | const struct nft_set_elem *elem) | |
469 | { | |
470 | struct nft_hash_elem *he = elem->priv; | |
471 | ||
472 | nft_set_elem_change_active(net, set, &he->ext); | |
473 | } | |
474 | ||
475 | static bool nft_hash_flush(const struct net *net, | |
476 | const struct nft_set *set, void *priv) | |
477 | { | |
478 | struct nft_hash_elem *he = priv; | |
479 | ||
480 | nft_set_elem_change_active(net, set, &he->ext); | |
481 | return true; | |
482 | } | |
483 | ||
484 | static void *nft_hash_deactivate(const struct net *net, | |
485 | const struct nft_set *set, | |
486 | const struct nft_set_elem *elem) | |
487 | { | |
488 | struct nft_hash *priv = nft_set_priv(set); | |
489 | struct nft_hash_elem *this = elem->priv, *he; | |
490 | u8 genmask = nft_genmask_next(net); | |
491 | u32 hash; | |
492 | ||
493 | hash = jhash(nft_set_ext_key(&this->ext), set->klen, priv->seed); | |
494 | hash = reciprocal_scale(hash, priv->buckets); | |
495 | hlist_for_each_entry(he, &priv->table[hash], node) { | |
496 | if (!memcmp(nft_set_ext_key(&this->ext), &elem->key.val, | |
497 | set->klen) || | |
498 | nft_set_elem_active(&he->ext, genmask)) { | |
499 | nft_set_elem_change_active(net, set, &he->ext); | |
500 | return he; | |
501 | } | |
502 | } | |
503 | return NULL; | |
504 | } | |
505 | ||
506 | static void nft_hash_remove(const struct net *net, | |
507 | const struct nft_set *set, | |
508 | const struct nft_set_elem *elem) | |
509 | { | |
510 | struct nft_hash_elem *he = elem->priv; | |
511 | ||
512 | hlist_del_rcu(&he->node); | |
513 | } | |
514 | ||
515 | static void nft_hash_walk(const struct nft_ctx *ctx, struct nft_set *set, | |
516 | struct nft_set_iter *iter) | |
517 | { | |
518 | struct nft_hash *priv = nft_set_priv(set); | |
519 | struct nft_hash_elem *he; | |
520 | struct nft_set_elem elem; | |
521 | int i; | |
522 | ||
523 | for (i = 0; i < priv->buckets; i++) { | |
524 | hlist_for_each_entry_rcu(he, &priv->table[i], node) { | |
525 | if (iter->count < iter->skip) | |
526 | goto cont; | |
527 | if (!nft_set_elem_active(&he->ext, iter->genmask)) | |
528 | goto cont; | |
529 | ||
530 | elem.priv = he; | |
531 | ||
532 | iter->err = iter->fn(ctx, set, iter, &elem); | |
533 | if (iter->err < 0) | |
534 | return; | |
535 | cont: | |
536 | iter->count++; | |
537 | } | |
538 | } | |
539 | } | |
540 | ||
541 | static unsigned int nft_hash_privsize(const struct nlattr * const nla[], | |
542 | const struct nft_set_desc *desc) | |
543 | { | |
544 | return sizeof(struct nft_hash) + | |
545 | nft_hash_buckets(desc->size) * sizeof(struct hlist_head); | |
546 | } | |
547 | ||
548 | static int nft_hash_init(const struct nft_set *set, | |
549 | const struct nft_set_desc *desc, | |
550 | const struct nlattr * const tb[]) | |
551 | { | |
552 | struct nft_hash *priv = nft_set_priv(set); | |
553 | ||
554 | priv->buckets = nft_hash_buckets(desc->size); | |
555 | get_random_bytes(&priv->seed, sizeof(priv->seed)); | |
556 | ||
557 | return 0; | |
558 | } | |
559 | ||
560 | static void nft_hash_destroy(const struct nft_set *set) | |
561 | { | |
562 | struct nft_hash *priv = nft_set_priv(set); | |
563 | struct nft_hash_elem *he; | |
564 | struct hlist_node *next; | |
565 | int i; | |
566 | ||
567 | for (i = 0; i < priv->buckets; i++) { | |
568 | hlist_for_each_entry_safe(he, next, &priv->table[i], node) { | |
569 | hlist_del_rcu(&he->node); | |
570 | nft_set_elem_destroy(set, he, true); | |
571 | } | |
572 | } | |
573 | } | |
c50b960c | 574 | |
6c03ae21 PNA |
575 | static bool nft_hash_estimate(const struct nft_set_desc *desc, u32 features, |
576 | struct nft_set_estimate *est) | |
577 | { | |
578 | est->size = sizeof(struct nft_hash) + | |
579 | nft_hash_buckets(desc->size) * sizeof(struct hlist_head) + | |
580 | desc->size * sizeof(struct nft_hash_elem); | |
55af753c | 581 | est->lookup = NFT_SET_CLASS_O_1; |
0b5a7874 | 582 | est->space = NFT_SET_CLASS_O_N; |
c50b960c PM |
583 | |
584 | return true; | |
585 | } | |
586 | ||
2b664957 | 587 | static struct nft_set_type nft_hash_type; |
5fc6ced9 | 588 | static struct nft_set_ops nft_rhash_ops __read_mostly = { |
2b664957 | 589 | .type = &nft_hash_type, |
5fc6ced9 PNA |
590 | .privsize = nft_rhash_privsize, |
591 | .elemsize = offsetof(struct nft_rhash_elem, ext), | |
592 | .estimate = nft_rhash_estimate, | |
593 | .init = nft_rhash_init, | |
594 | .destroy = nft_rhash_destroy, | |
595 | .insert = nft_rhash_insert, | |
596 | .activate = nft_rhash_activate, | |
597 | .deactivate = nft_rhash_deactivate, | |
598 | .flush = nft_rhash_flush, | |
599 | .remove = nft_rhash_remove, | |
600 | .lookup = nft_rhash_lookup, | |
601 | .update = nft_rhash_update, | |
602 | .walk = nft_rhash_walk, | |
7286ff7f | 603 | .features = NFT_SET_MAP | NFT_SET_OBJECT | NFT_SET_TIMEOUT, |
2b664957 PNA |
604 | }; |
605 | ||
6c03ae21 PNA |
606 | static struct nft_set_ops nft_hash_ops __read_mostly = { |
607 | .type = &nft_hash_type, | |
608 | .privsize = nft_hash_privsize, | |
609 | .elemsize = offsetof(struct nft_hash_elem, ext), | |
610 | .estimate = nft_hash_estimate, | |
611 | .init = nft_hash_init, | |
612 | .destroy = nft_hash_destroy, | |
613 | .insert = nft_hash_insert, | |
614 | .activate = nft_hash_activate, | |
615 | .deactivate = nft_hash_deactivate, | |
616 | .flush = nft_hash_flush, | |
617 | .remove = nft_hash_remove, | |
618 | .lookup = nft_hash_lookup, | |
619 | .walk = nft_hash_walk, | |
620 | .features = NFT_SET_MAP | NFT_SET_OBJECT, | |
621 | }; | |
622 | ||
446a8268 PNA |
623 | static struct nft_set_ops nft_hash_fast_ops __read_mostly = { |
624 | .type = &nft_hash_type, | |
625 | .privsize = nft_hash_privsize, | |
626 | .elemsize = offsetof(struct nft_hash_elem, ext), | |
627 | .estimate = nft_hash_estimate, | |
628 | .init = nft_hash_init, | |
629 | .destroy = nft_hash_destroy, | |
630 | .insert = nft_hash_insert, | |
631 | .activate = nft_hash_activate, | |
632 | .deactivate = nft_hash_deactivate, | |
633 | .flush = nft_hash_flush, | |
634 | .remove = nft_hash_remove, | |
635 | .lookup = nft_hash_lookup_fast, | |
636 | .walk = nft_hash_walk, | |
637 | .features = NFT_SET_MAP | NFT_SET_OBJECT, | |
638 | }; | |
639 | ||
6c03ae21 PNA |
640 | static const struct nft_set_ops * |
641 | nft_hash_select_ops(const struct nft_ctx *ctx, const struct nft_set_desc *desc, | |
642 | u32 flags) | |
643 | { | |
446a8268 PNA |
644 | if (desc->size) { |
645 | switch (desc->klen) { | |
646 | case 2: | |
647 | case 4: | |
648 | return &nft_hash_fast_ops; | |
649 | default: | |
650 | return &nft_hash_ops; | |
651 | } | |
652 | } | |
6c03ae21 PNA |
653 | |
654 | return &nft_rhash_ops; | |
655 | } | |
656 | ||
2b664957 | 657 | static struct nft_set_type nft_hash_type __read_mostly = { |
6c03ae21 | 658 | .select_ops = nft_hash_select_ops, |
20a69341 | 659 | .owner = THIS_MODULE, |
96518518 PM |
660 | }; |
661 | ||
662 | static int __init nft_hash_module_init(void) | |
663 | { | |
2b664957 | 664 | return nft_register_set(&nft_hash_type); |
96518518 PM |
665 | } |
666 | ||
667 | static void __exit nft_hash_module_exit(void) | |
668 | { | |
2b664957 | 669 | nft_unregister_set(&nft_hash_type); |
96518518 PM |
670 | } |
671 | ||
672 | module_init(nft_hash_module_init); | |
673 | module_exit(nft_hash_module_exit); | |
674 | ||
675 | MODULE_LICENSE("GPL"); | |
676 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
20a69341 | 677 | MODULE_ALIAS_NFT_SET(); |