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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 PM |
25 | |
26 | struct nft_hash_elem { | |
cfe4a9dd | 27 | struct rhash_head node; |
ce6eb0d7 PM |
28 | struct nft_data key; |
29 | struct nft_data data[]; | |
96518518 PM |
30 | }; |
31 | ||
20a69341 PM |
32 | static bool nft_hash_lookup(const struct nft_set *set, |
33 | const struct nft_data *key, | |
34 | struct nft_data *data) | |
96518518 | 35 | { |
97defe1e | 36 | struct rhashtable *priv = nft_set_priv(set); |
20a69341 | 37 | const struct nft_hash_elem *he; |
ce6eb0d7 | 38 | |
cfe4a9dd TG |
39 | he = rhashtable_lookup(priv, key); |
40 | if (he && set->flags & NFT_SET_MAP) | |
41 | nft_data_copy(data, he->data); | |
ce6eb0d7 | 42 | |
cfe4a9dd | 43 | return !!he; |
96518518 PM |
44 | } |
45 | ||
20a69341 PM |
46 | static int nft_hash_insert(const struct nft_set *set, |
47 | const struct nft_set_elem *elem) | |
96518518 | 48 | { |
cfe4a9dd | 49 | struct rhashtable *priv = nft_set_priv(set); |
20a69341 | 50 | struct nft_hash_elem *he; |
cfe4a9dd | 51 | unsigned int size; |
96518518 | 52 | |
20a69341 | 53 | if (elem->flags != 0) |
96518518 | 54 | return -EINVAL; |
96518518 | 55 | |
20a69341 PM |
56 | size = sizeof(*he); |
57 | if (set->flags & NFT_SET_MAP) | |
58 | size += sizeof(he->data[0]); | |
59 | ||
60 | he = kzalloc(size, GFP_KERNEL); | |
61 | if (he == NULL) | |
96518518 PM |
62 | return -ENOMEM; |
63 | ||
20a69341 PM |
64 | nft_data_copy(&he->key, &elem->key); |
65 | if (set->flags & NFT_SET_MAP) | |
66 | nft_data_copy(he->data, &elem->data); | |
96518518 | 67 | |
6eba8224 | 68 | rhashtable_insert(priv, &he->node); |
ce6eb0d7 | 69 | |
96518518 | 70 | return 0; |
96518518 PM |
71 | } |
72 | ||
ce6eb0d7 PM |
73 | static void nft_hash_elem_destroy(const struct nft_set *set, |
74 | struct nft_hash_elem *he) | |
75 | { | |
76 | nft_data_uninit(&he->key, NFT_DATA_VALUE); | |
77 | if (set->flags & NFT_SET_MAP) | |
78 | nft_data_uninit(he->data, set->dtype); | |
79 | kfree(he); | |
80 | } | |
81 | ||
20a69341 PM |
82 | static void nft_hash_remove(const struct nft_set *set, |
83 | const struct nft_set_elem *elem) | |
96518518 | 84 | { |
cfe4a9dd | 85 | struct rhashtable *priv = nft_set_priv(set); |
ce6eb0d7 | 86 | |
897362e4 | 87 | rhashtable_remove(priv, elem->cookie); |
ce6eb0d7 | 88 | synchronize_rcu(); |
897362e4 | 89 | kfree(elem->cookie); |
20a69341 | 90 | } |
96518518 | 91 | |
8d24c0b4 TG |
92 | struct nft_compare_arg { |
93 | const struct nft_set *set; | |
94 | struct nft_set_elem *elem; | |
95 | }; | |
96 | ||
97 | static bool nft_hash_compare(void *ptr, void *arg) | |
98 | { | |
99 | struct nft_hash_elem *he = ptr; | |
100 | struct nft_compare_arg *x = arg; | |
101 | ||
102 | if (!nft_data_cmp(&he->key, &x->elem->key, x->set->klen)) { | |
897362e4 | 103 | x->elem->cookie = he; |
8d24c0b4 TG |
104 | x->elem->flags = 0; |
105 | if (x->set->flags & NFT_SET_MAP) | |
106 | nft_data_copy(&x->elem->data, he->data); | |
107 | ||
108 | return true; | |
109 | } | |
110 | ||
111 | return false; | |
112 | } | |
113 | ||
20a69341 PM |
114 | static int nft_hash_get(const struct nft_set *set, struct nft_set_elem *elem) |
115 | { | |
97defe1e | 116 | struct rhashtable *priv = nft_set_priv(set); |
8d24c0b4 TG |
117 | struct nft_compare_arg arg = { |
118 | .set = set, | |
119 | .elem = elem, | |
120 | }; | |
121 | ||
122 | if (rhashtable_lookup_compare(priv, &elem->key, | |
123 | &nft_hash_compare, &arg)) | |
20a69341 | 124 | return 0; |
8d24c0b4 | 125 | |
20a69341 | 126 | return -ENOENT; |
96518518 PM |
127 | } |
128 | ||
20a69341 PM |
129 | static void nft_hash_walk(const struct nft_ctx *ctx, const struct nft_set *set, |
130 | struct nft_set_iter *iter) | |
96518518 | 131 | { |
97defe1e | 132 | struct rhashtable *priv = nft_set_priv(set); |
20a69341 | 133 | const struct nft_hash_elem *he; |
9a776628 | 134 | struct rhashtable_iter hti; |
20a69341 | 135 | struct nft_set_elem elem; |
9a776628 | 136 | int err; |
96518518 | 137 | |
9a776628 HX |
138 | err = rhashtable_walk_init(priv, &hti); |
139 | iter->err = err; | |
140 | if (err) | |
141 | return; | |
88d6ed15 | 142 | |
9a776628 HX |
143 | err = rhashtable_walk_start(&hti); |
144 | if (err && err != -EAGAIN) { | |
145 | iter->err = err; | |
146 | goto out; | |
147 | } | |
148 | ||
149 | while ((he = rhashtable_walk_next(&hti))) { | |
150 | if (IS_ERR(he)) { | |
151 | err = PTR_ERR(he); | |
152 | if (err != -EAGAIN) { | |
153 | iter->err = err; | |
154 | goto out; | |
155 | } | |
156 | } | |
157 | ||
158 | if (iter->count < iter->skip) | |
159 | goto cont; | |
20a69341 | 160 | |
9a776628 HX |
161 | memcpy(&elem.key, &he->key, sizeof(elem.key)); |
162 | if (set->flags & NFT_SET_MAP) | |
163 | memcpy(&elem.data, he->data, sizeof(elem.data)); | |
164 | elem.flags = 0; | |
165 | ||
166 | iter->err = iter->fn(ctx, set, iter, &elem); | |
167 | if (iter->err < 0) | |
168 | goto out; | |
20a69341 | 169 | |
20a69341 | 170 | cont: |
9a776628 | 171 | iter->count++; |
96518518 | 172 | } |
9a776628 HX |
173 | |
174 | out: | |
175 | rhashtable_walk_stop(&hti); | |
176 | rhashtable_walk_exit(&hti); | |
96518518 PM |
177 | } |
178 | ||
20a69341 PM |
179 | static unsigned int nft_hash_privsize(const struct nlattr * const nla[]) |
180 | { | |
cfe4a9dd TG |
181 | return sizeof(struct rhashtable); |
182 | } | |
183 | ||
20a69341 | 184 | static int nft_hash_init(const struct nft_set *set, |
c50b960c | 185 | const struct nft_set_desc *desc, |
96518518 PM |
186 | const struct nlattr * const tb[]) |
187 | { | |
cfe4a9dd TG |
188 | struct rhashtable *priv = nft_set_priv(set); |
189 | struct rhashtable_params params = { | |
190 | .nelem_hint = desc->size ? : NFT_HASH_ELEMENT_HINT, | |
191 | .head_offset = offsetof(struct nft_hash_elem, node), | |
192 | .key_offset = offsetof(struct nft_hash_elem, key), | |
193 | .key_len = set->klen, | |
194 | .hashfn = jhash, | |
cfe4a9dd | 195 | }; |
96518518 | 196 | |
cfe4a9dd | 197 | return rhashtable_init(priv, ¶ms); |
96518518 PM |
198 | } |
199 | ||
20a69341 | 200 | static void nft_hash_destroy(const struct nft_set *set) |
96518518 | 201 | { |
97defe1e TG |
202 | struct rhashtable *priv = nft_set_priv(set); |
203 | const struct bucket_table *tbl; | |
88d6ed15 TG |
204 | struct nft_hash_elem *he; |
205 | struct rhash_head *pos, *next; | |
96518518 PM |
206 | unsigned int i; |
207 | ||
97defe1e TG |
208 | /* Stop an eventual async resizing */ |
209 | priv->being_destroyed = true; | |
210 | mutex_lock(&priv->mutex); | |
211 | ||
212 | tbl = rht_dereference(priv->tbl, priv); | |
39f39016 | 213 | for (i = 0; i < tbl->size; i++) { |
88d6ed15 | 214 | rht_for_each_entry_safe(he, pos, next, tbl, i, node) |
ce6eb0d7 | 215 | nft_hash_elem_destroy(set, he); |
39f39016 | 216 | } |
97defe1e TG |
217 | mutex_unlock(&priv->mutex); |
218 | ||
cfe4a9dd | 219 | rhashtable_destroy(priv); |
96518518 PM |
220 | } |
221 | ||
c50b960c PM |
222 | static bool nft_hash_estimate(const struct nft_set_desc *desc, u32 features, |
223 | struct nft_set_estimate *est) | |
224 | { | |
225 | unsigned int esize; | |
226 | ||
227 | esize = sizeof(struct nft_hash_elem); | |
228 | if (features & NFT_SET_MAP) | |
229 | esize += FIELD_SIZEOF(struct nft_hash_elem, data[0]); | |
230 | ||
231 | if (desc->size) { | |
cfe4a9dd TG |
232 | est->size = sizeof(struct rhashtable) + |
233 | roundup_pow_of_two(desc->size * 4 / 3) * | |
c50b960c PM |
234 | sizeof(struct nft_hash_elem *) + |
235 | desc->size * esize; | |
236 | } else { | |
237 | /* Resizing happens when the load drops below 30% or goes | |
238 | * above 75%. The average of 52.5% load (approximated by 50%) | |
239 | * is used for the size estimation of the hash buckets, | |
240 | * meaning we calculate two buckets per element. | |
241 | */ | |
242 | est->size = esize + 2 * sizeof(struct nft_hash_elem *); | |
243 | } | |
244 | ||
245 | est->class = NFT_SET_CLASS_O_1; | |
246 | ||
247 | return true; | |
248 | } | |
249 | ||
20a69341 PM |
250 | static struct nft_set_ops nft_hash_ops __read_mostly = { |
251 | .privsize = nft_hash_privsize, | |
c50b960c | 252 | .estimate = nft_hash_estimate, |
96518518 PM |
253 | .init = nft_hash_init, |
254 | .destroy = nft_hash_destroy, | |
20a69341 PM |
255 | .get = nft_hash_get, |
256 | .insert = nft_hash_insert, | |
257 | .remove = nft_hash_remove, | |
258 | .lookup = nft_hash_lookup, | |
259 | .walk = nft_hash_walk, | |
260 | .features = NFT_SET_MAP, | |
261 | .owner = THIS_MODULE, | |
96518518 PM |
262 | }; |
263 | ||
264 | static int __init nft_hash_module_init(void) | |
265 | { | |
20a69341 | 266 | return nft_register_set(&nft_hash_ops); |
96518518 PM |
267 | } |
268 | ||
269 | static void __exit nft_hash_module_exit(void) | |
270 | { | |
20a69341 | 271 | nft_unregister_set(&nft_hash_ops); |
96518518 PM |
272 | } |
273 | ||
274 | module_init(nft_hash_module_init); | |
275 | module_exit(nft_hash_module_exit); | |
276 | ||
277 | MODULE_LICENSE("GPL"); | |
278 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
20a69341 | 279 | MODULE_ALIAS_NFT_SET(); |