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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> | |
cfe4a9dd | 18 | #include <linux/rhashtable.h> |
96518518 PM |
19 | #include <linux/netfilter.h> |
20 | #include <linux/netfilter/nf_tables.h> | |
21 | #include <net/netfilter/nf_tables.h> | |
22 | ||
cfe4a9dd TG |
23 | /* We target a hash table size of 4, element hint is 75% of final size */ |
24 | #define NFT_HASH_ELEMENT_HINT 3 | |
96518518 | 25 | |
745f5450 PM |
26 | struct nft_hash { |
27 | struct rhashtable ht; | |
28 | }; | |
29 | ||
96518518 | 30 | struct nft_hash_elem { |
cfe4a9dd | 31 | struct rhash_head node; |
ce6eb0d7 PM |
32 | struct nft_data key; |
33 | struct nft_data data[]; | |
96518518 PM |
34 | }; |
35 | ||
bfd6e327 PM |
36 | struct nft_hash_cmp_arg { |
37 | const struct nft_set *set; | |
38 | const struct nft_data *key; | |
39 | }; | |
40 | ||
fa377321 HX |
41 | static const struct rhashtable_params nft_hash_params; |
42 | ||
bfd6e327 PM |
43 | static inline u32 nft_hash_key(const void *data, u32 len, u32 seed) |
44 | { | |
45 | const struct nft_hash_cmp_arg *arg = data; | |
46 | ||
47 | return jhash(arg->key, len, seed); | |
48 | } | |
49 | ||
50 | static inline u32 nft_hash_obj(const void *data, u32 len, u32 seed) | |
51 | { | |
52 | const struct nft_hash_elem *he = data; | |
53 | ||
54 | return jhash(&he->key, len, seed); | |
55 | } | |
56 | ||
57 | static inline int nft_hash_cmp(struct rhashtable_compare_arg *arg, | |
58 | const void *ptr) | |
59 | { | |
60 | const struct nft_hash_cmp_arg *x = arg->key; | |
61 | const struct nft_hash_elem *he = ptr; | |
62 | ||
63 | if (nft_data_cmp(&he->key, x->key, x->set->klen)) | |
64 | return 1; | |
65 | return 0; | |
66 | } | |
67 | ||
20a69341 PM |
68 | static bool nft_hash_lookup(const struct nft_set *set, |
69 | const struct nft_data *key, | |
70 | struct nft_data *data) | |
96518518 | 71 | { |
745f5450 | 72 | struct nft_hash *priv = nft_set_priv(set); |
20a69341 | 73 | const struct nft_hash_elem *he; |
bfd6e327 PM |
74 | struct nft_hash_cmp_arg arg = { |
75 | .set = set, | |
76 | .key = key, | |
77 | }; | |
ce6eb0d7 | 78 | |
bfd6e327 | 79 | he = rhashtable_lookup_fast(&priv->ht, &arg, nft_hash_params); |
cfe4a9dd TG |
80 | if (he && set->flags & NFT_SET_MAP) |
81 | nft_data_copy(data, he->data); | |
ce6eb0d7 | 82 | |
cfe4a9dd | 83 | return !!he; |
96518518 PM |
84 | } |
85 | ||
20a69341 PM |
86 | static int nft_hash_insert(const struct nft_set *set, |
87 | const struct nft_set_elem *elem) | |
96518518 | 88 | { |
745f5450 | 89 | struct nft_hash *priv = nft_set_priv(set); |
20a69341 | 90 | struct nft_hash_elem *he; |
bfd6e327 PM |
91 | struct nft_hash_cmp_arg arg = { |
92 | .set = set, | |
93 | .key = &elem->key, | |
94 | }; | |
cfe4a9dd | 95 | unsigned int size; |
fa377321 | 96 | int err; |
96518518 | 97 | |
20a69341 | 98 | if (elem->flags != 0) |
96518518 | 99 | return -EINVAL; |
96518518 | 100 | |
20a69341 PM |
101 | size = sizeof(*he); |
102 | if (set->flags & NFT_SET_MAP) | |
103 | size += sizeof(he->data[0]); | |
104 | ||
105 | he = kzalloc(size, GFP_KERNEL); | |
106 | if (he == NULL) | |
96518518 PM |
107 | return -ENOMEM; |
108 | ||
20a69341 PM |
109 | nft_data_copy(&he->key, &elem->key); |
110 | if (set->flags & NFT_SET_MAP) | |
111 | nft_data_copy(he->data, &elem->data); | |
96518518 | 112 | |
bfd6e327 PM |
113 | err = rhashtable_lookup_insert_key(&priv->ht, &arg, &he->node, |
114 | nft_hash_params); | |
fa377321 HX |
115 | if (err) |
116 | kfree(he); | |
ce6eb0d7 | 117 | |
fa377321 | 118 | return err; |
96518518 PM |
119 | } |
120 | ||
ce6eb0d7 PM |
121 | static void nft_hash_elem_destroy(const struct nft_set *set, |
122 | struct nft_hash_elem *he) | |
123 | { | |
124 | nft_data_uninit(&he->key, NFT_DATA_VALUE); | |
125 | if (set->flags & NFT_SET_MAP) | |
126 | nft_data_uninit(he->data, set->dtype); | |
127 | kfree(he); | |
128 | } | |
129 | ||
20a69341 PM |
130 | static void nft_hash_remove(const struct nft_set *set, |
131 | const struct nft_set_elem *elem) | |
96518518 | 132 | { |
745f5450 | 133 | struct nft_hash *priv = nft_set_priv(set); |
ce6eb0d7 | 134 | |
745f5450 | 135 | rhashtable_remove_fast(&priv->ht, elem->cookie, nft_hash_params); |
ce6eb0d7 | 136 | synchronize_rcu(); |
897362e4 | 137 | kfree(elem->cookie); |
20a69341 | 138 | } |
96518518 | 139 | |
20a69341 PM |
140 | static int nft_hash_get(const struct nft_set *set, struct nft_set_elem *elem) |
141 | { | |
745f5450 | 142 | struct nft_hash *priv = nft_set_priv(set); |
fa377321 | 143 | struct nft_hash_elem *he; |
bfd6e327 PM |
144 | struct nft_hash_cmp_arg arg = { |
145 | .set = set, | |
146 | .key = &elem->key, | |
147 | }; | |
fa377321 | 148 | |
bfd6e327 | 149 | he = rhashtable_lookup_fast(&priv->ht, &arg, nft_hash_params); |
fa377321 HX |
150 | if (!he) |
151 | return -ENOENT; | |
8d24c0b4 | 152 | |
fa377321 HX |
153 | elem->cookie = he; |
154 | elem->flags = 0; | |
155 | if (set->flags & NFT_SET_MAP) | |
156 | nft_data_copy(&elem->data, he->data); | |
8d24c0b4 | 157 | |
fa377321 | 158 | return 0; |
96518518 PM |
159 | } |
160 | ||
20a69341 PM |
161 | static void nft_hash_walk(const struct nft_ctx *ctx, const struct nft_set *set, |
162 | struct nft_set_iter *iter) | |
96518518 | 163 | { |
745f5450 | 164 | struct nft_hash *priv = nft_set_priv(set); |
20a69341 | 165 | const struct nft_hash_elem *he; |
9a776628 | 166 | struct rhashtable_iter hti; |
20a69341 | 167 | struct nft_set_elem elem; |
9a776628 | 168 | int err; |
96518518 | 169 | |
745f5450 | 170 | err = rhashtable_walk_init(&priv->ht, &hti); |
9a776628 HX |
171 | iter->err = err; |
172 | if (err) | |
173 | return; | |
88d6ed15 | 174 | |
9a776628 HX |
175 | err = rhashtable_walk_start(&hti); |
176 | if (err && err != -EAGAIN) { | |
177 | iter->err = err; | |
178 | goto out; | |
179 | } | |
180 | ||
181 | while ((he = rhashtable_walk_next(&hti))) { | |
182 | if (IS_ERR(he)) { | |
183 | err = PTR_ERR(he); | |
184 | if (err != -EAGAIN) { | |
185 | iter->err = err; | |
186 | goto out; | |
187 | } | |
d8bdff59 HX |
188 | |
189 | continue; | |
9a776628 HX |
190 | } |
191 | ||
192 | if (iter->count < iter->skip) | |
193 | goto cont; | |
20a69341 | 194 | |
9a776628 HX |
195 | memcpy(&elem.key, &he->key, sizeof(elem.key)); |
196 | if (set->flags & NFT_SET_MAP) | |
197 | memcpy(&elem.data, he->data, sizeof(elem.data)); | |
198 | elem.flags = 0; | |
199 | ||
200 | iter->err = iter->fn(ctx, set, iter, &elem); | |
201 | if (iter->err < 0) | |
202 | goto out; | |
20a69341 | 203 | |
20a69341 | 204 | cont: |
9a776628 | 205 | iter->count++; |
96518518 | 206 | } |
9a776628 HX |
207 | |
208 | out: | |
209 | rhashtable_walk_stop(&hti); | |
210 | rhashtable_walk_exit(&hti); | |
96518518 PM |
211 | } |
212 | ||
20a69341 PM |
213 | static unsigned int nft_hash_privsize(const struct nlattr * const nla[]) |
214 | { | |
745f5450 | 215 | return sizeof(struct nft_hash); |
cfe4a9dd TG |
216 | } |
217 | ||
fa377321 | 218 | static const struct rhashtable_params nft_hash_params = { |
45d84751 | 219 | .head_offset = offsetof(struct nft_hash_elem, node), |
bfd6e327 PM |
220 | .hashfn = nft_hash_key, |
221 | .obj_hashfn = nft_hash_obj, | |
222 | .obj_cmpfn = nft_hash_cmp, | |
45d84751 | 223 | .automatic_shrinking = true, |
fa377321 HX |
224 | }; |
225 | ||
20a69341 | 226 | static int nft_hash_init(const struct nft_set *set, |
c50b960c | 227 | const struct nft_set_desc *desc, |
96518518 PM |
228 | const struct nlattr * const tb[]) |
229 | { | |
745f5450 | 230 | struct nft_hash *priv = nft_set_priv(set); |
fa377321 HX |
231 | struct rhashtable_params params = nft_hash_params; |
232 | ||
233 | params.nelem_hint = desc->size ?: NFT_HASH_ELEMENT_HINT; | |
45d84751 | 234 | params.key_len = set->klen; |
96518518 | 235 | |
745f5450 | 236 | return rhashtable_init(&priv->ht, ¶ms); |
96518518 PM |
237 | } |
238 | ||
6b6f302c | 239 | static void nft_free_element(void *ptr, void *arg) |
96518518 | 240 | { |
6b6f302c TG |
241 | nft_hash_elem_destroy((const struct nft_set *)arg, ptr); |
242 | } | |
97defe1e | 243 | |
6b6f302c TG |
244 | static void nft_hash_destroy(const struct nft_set *set) |
245 | { | |
745f5450 PM |
246 | struct nft_hash *priv = nft_set_priv(set); |
247 | ||
248 | rhashtable_free_and_destroy(&priv->ht, nft_free_element, (void *)set); | |
96518518 PM |
249 | } |
250 | ||
c50b960c PM |
251 | static bool nft_hash_estimate(const struct nft_set_desc *desc, u32 features, |
252 | struct nft_set_estimate *est) | |
253 | { | |
254 | unsigned int esize; | |
255 | ||
256 | esize = sizeof(struct nft_hash_elem); | |
257 | if (features & NFT_SET_MAP) | |
258 | esize += FIELD_SIZEOF(struct nft_hash_elem, data[0]); | |
259 | ||
260 | if (desc->size) { | |
745f5450 | 261 | est->size = sizeof(struct nft_hash) + |
cfe4a9dd | 262 | roundup_pow_of_two(desc->size * 4 / 3) * |
c50b960c PM |
263 | sizeof(struct nft_hash_elem *) + |
264 | desc->size * esize; | |
265 | } else { | |
266 | /* Resizing happens when the load drops below 30% or goes | |
267 | * above 75%. The average of 52.5% load (approximated by 50%) | |
268 | * is used for the size estimation of the hash buckets, | |
269 | * meaning we calculate two buckets per element. | |
270 | */ | |
271 | est->size = esize + 2 * sizeof(struct nft_hash_elem *); | |
272 | } | |
273 | ||
274 | est->class = NFT_SET_CLASS_O_1; | |
275 | ||
276 | return true; | |
277 | } | |
278 | ||
20a69341 PM |
279 | static struct nft_set_ops nft_hash_ops __read_mostly = { |
280 | .privsize = nft_hash_privsize, | |
c50b960c | 281 | .estimate = nft_hash_estimate, |
96518518 PM |
282 | .init = nft_hash_init, |
283 | .destroy = nft_hash_destroy, | |
20a69341 PM |
284 | .get = nft_hash_get, |
285 | .insert = nft_hash_insert, | |
286 | .remove = nft_hash_remove, | |
287 | .lookup = nft_hash_lookup, | |
288 | .walk = nft_hash_walk, | |
289 | .features = NFT_SET_MAP, | |
290 | .owner = THIS_MODULE, | |
96518518 PM |
291 | }; |
292 | ||
293 | static int __init nft_hash_module_init(void) | |
294 | { | |
20a69341 | 295 | return nft_register_set(&nft_hash_ops); |
96518518 PM |
296 | } |
297 | ||
298 | static void __exit nft_hash_module_exit(void) | |
299 | { | |
20a69341 | 300 | nft_unregister_set(&nft_hash_ops); |
96518518 PM |
301 | } |
302 | ||
303 | module_init(nft_hash_module_init); | |
304 | module_exit(nft_hash_module_exit); | |
305 | ||
306 | MODULE_LICENSE("GPL"); | |
307 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
20a69341 | 308 | MODULE_ALIAS_NFT_SET(); |