Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1 | /* |
Patrick McHardy | ce6eb0d | 2014-03-04 16:21:51 +0100 | [diff] [blame] | 2 | * Copyright (c) 2008-2014 Patrick McHardy <kaber@trash.net> |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 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> |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 15 | #include <linux/log2.h> |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 16 | #include <linux/jhash.h> |
| 17 | #include <linux/netlink.h> |
Thomas Graf | cfe4a9d | 2014-08-02 11:47:46 +0200 | [diff] [blame] | 18 | #include <linux/rhashtable.h> |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 19 | #include <linux/netfilter.h> |
| 20 | #include <linux/netfilter/nf_tables.h> |
| 21 | #include <net/netfilter/nf_tables.h> |
| 22 | |
Thomas Graf | cfe4a9d | 2014-08-02 11:47:46 +0200 | [diff] [blame] | 23 | /* We target a hash table size of 4, element hint is 75% of final size */ |
| 24 | #define NFT_HASH_ELEMENT_HINT 3 |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 25 | |
| 26 | struct nft_hash_elem { |
Thomas Graf | cfe4a9d | 2014-08-02 11:47:46 +0200 | [diff] [blame] | 27 | struct rhash_head node; |
Patrick McHardy | ce6eb0d | 2014-03-04 16:21:51 +0100 | [diff] [blame] | 28 | struct nft_data key; |
| 29 | struct nft_data data[]; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 30 | }; |
| 31 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 32 | static bool nft_hash_lookup(const struct nft_set *set, |
| 33 | const struct nft_data *key, |
| 34 | struct nft_data *data) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 35 | { |
Thomas Graf | cfe4a9d | 2014-08-02 11:47:46 +0200 | [diff] [blame] | 36 | const struct rhashtable *priv = nft_set_priv(set); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 37 | const struct nft_hash_elem *he; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 38 | |
Thomas Graf | cfe4a9d | 2014-08-02 11:47:46 +0200 | [diff] [blame] | 39 | he = rhashtable_lookup(priv, key); |
| 40 | if (he && set->flags & NFT_SET_MAP) |
| 41 | nft_data_copy(data, he->data); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 42 | |
Thomas Graf | cfe4a9d | 2014-08-02 11:47:46 +0200 | [diff] [blame] | 43 | return !!he; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 44 | } |
| 45 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 46 | static int nft_hash_insert(const struct nft_set *set, |
| 47 | const struct nft_set_elem *elem) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 48 | { |
Thomas Graf | cfe4a9d | 2014-08-02 11:47:46 +0200 | [diff] [blame] | 49 | struct rhashtable *priv = nft_set_priv(set); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 50 | struct nft_hash_elem *he; |
Thomas Graf | cfe4a9d | 2014-08-02 11:47:46 +0200 | [diff] [blame] | 51 | unsigned int size; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 52 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 53 | if (elem->flags != 0) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 54 | return -EINVAL; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 55 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 56 | size = sizeof(*he); |
| 57 | if (set->flags & NFT_SET_MAP) |
| 58 | size += sizeof(he->data[0]); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 59 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 60 | he = kzalloc(size, GFP_KERNEL); |
| 61 | if (he == NULL) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 62 | return -ENOMEM; |
| 63 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 64 | nft_data_copy(&he->key, &elem->key); |
| 65 | if (set->flags & NFT_SET_MAP) |
| 66 | nft_data_copy(he->data, &elem->data); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 67 | |
Thomas Graf | cfe4a9d | 2014-08-02 11:47:46 +0200 | [diff] [blame] | 68 | rhashtable_insert(priv, &he->node, GFP_KERNEL); |
Patrick McHardy | ce6eb0d | 2014-03-04 16:21:51 +0100 | [diff] [blame] | 69 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 70 | return 0; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 71 | } |
| 72 | |
Patrick McHardy | ce6eb0d | 2014-03-04 16:21:51 +0100 | [diff] [blame] | 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 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 82 | static void nft_hash_remove(const struct nft_set *set, |
| 83 | const struct nft_set_elem *elem) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 84 | { |
Thomas Graf | cfe4a9d | 2014-08-02 11:47:46 +0200 | [diff] [blame] | 85 | struct rhashtable *priv = nft_set_priv(set); |
| 86 | struct rhash_head *he, __rcu **pprev; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 87 | |
Patrick McHardy | ce6eb0d | 2014-03-04 16:21:51 +0100 | [diff] [blame] | 88 | pprev = elem->cookie; |
Thomas Graf | cfe4a9d | 2014-08-02 11:47:46 +0200 | [diff] [blame] | 89 | he = rht_dereference((*pprev), priv); |
Patrick McHardy | ce6eb0d | 2014-03-04 16:21:51 +0100 | [diff] [blame] | 90 | |
Thomas Graf | cfe4a9d | 2014-08-02 11:47:46 +0200 | [diff] [blame] | 91 | rhashtable_remove_pprev(priv, he, pprev, GFP_KERNEL); |
| 92 | |
Patrick McHardy | ce6eb0d | 2014-03-04 16:21:51 +0100 | [diff] [blame] | 93 | synchronize_rcu(); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 94 | kfree(he); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 95 | } |
| 96 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 97 | static int nft_hash_get(const struct nft_set *set, struct nft_set_elem *elem) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 98 | { |
Thomas Graf | cfe4a9d | 2014-08-02 11:47:46 +0200 | [diff] [blame] | 99 | const struct rhashtable *priv = nft_set_priv(set); |
| 100 | const struct bucket_table *tbl = rht_dereference_rcu(priv->tbl, priv); |
| 101 | struct rhash_head __rcu * const *pprev; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 102 | struct nft_hash_elem *he; |
Thomas Graf | cfe4a9d | 2014-08-02 11:47:46 +0200 | [diff] [blame] | 103 | u32 h; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 104 | |
Thomas Graf | cfe4a9d | 2014-08-02 11:47:46 +0200 | [diff] [blame] | 105 | h = rhashtable_hashfn(priv, &elem->key, set->klen); |
Patrick McHardy | ce6eb0d | 2014-03-04 16:21:51 +0100 | [diff] [blame] | 106 | pprev = &tbl->buckets[h]; |
Thomas Graf | cfe4a9d | 2014-08-02 11:47:46 +0200 | [diff] [blame] | 107 | rht_for_each_entry_rcu(he, tbl->buckets[h], node) { |
Patrick McHardy | ce6eb0d | 2014-03-04 16:21:51 +0100 | [diff] [blame] | 108 | if (nft_data_cmp(&he->key, &elem->key, set->klen)) { |
Thomas Graf | cfe4a9d | 2014-08-02 11:47:46 +0200 | [diff] [blame] | 109 | pprev = &he->node.next; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 110 | continue; |
Patrick McHardy | ce6eb0d | 2014-03-04 16:21:51 +0100 | [diff] [blame] | 111 | } |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 112 | |
Patrick McHardy | ce6eb0d | 2014-03-04 16:21:51 +0100 | [diff] [blame] | 113 | elem->cookie = (void *)pprev; |
| 114 | elem->flags = 0; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 115 | if (set->flags & NFT_SET_MAP) |
| 116 | nft_data_copy(&elem->data, he->data); |
| 117 | return 0; |
| 118 | } |
| 119 | return -ENOENT; |
| 120 | } |
| 121 | |
| 122 | static void nft_hash_walk(const struct nft_ctx *ctx, const struct nft_set *set, |
| 123 | struct nft_set_iter *iter) |
| 124 | { |
Thomas Graf | cfe4a9d | 2014-08-02 11:47:46 +0200 | [diff] [blame] | 125 | const struct rhashtable *priv = nft_set_priv(set); |
| 126 | const struct bucket_table *tbl; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 127 | const struct nft_hash_elem *he; |
| 128 | struct nft_set_elem elem; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 129 | unsigned int i; |
| 130 | |
Thomas Graf | cfe4a9d | 2014-08-02 11:47:46 +0200 | [diff] [blame] | 131 | tbl = rht_dereference_rcu(priv->tbl, priv); |
Patrick McHardy | ce6eb0d | 2014-03-04 16:21:51 +0100 | [diff] [blame] | 132 | for (i = 0; i < tbl->size; i++) { |
Thomas Graf | cfe4a9d | 2014-08-02 11:47:46 +0200 | [diff] [blame] | 133 | rht_for_each_entry_rcu(he, tbl->buckets[i], node) { |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 134 | if (iter->count < iter->skip) |
| 135 | goto cont; |
| 136 | |
| 137 | memcpy(&elem.key, &he->key, sizeof(elem.key)); |
| 138 | if (set->flags & NFT_SET_MAP) |
| 139 | memcpy(&elem.data, he->data, sizeof(elem.data)); |
| 140 | elem.flags = 0; |
| 141 | |
| 142 | iter->err = iter->fn(ctx, set, iter, &elem); |
| 143 | if (iter->err < 0) |
| 144 | return; |
| 145 | cont: |
| 146 | iter->count++; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 147 | } |
| 148 | } |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 149 | } |
| 150 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 151 | static unsigned int nft_hash_privsize(const struct nlattr * const nla[]) |
| 152 | { |
Thomas Graf | cfe4a9d | 2014-08-02 11:47:46 +0200 | [diff] [blame] | 153 | return sizeof(struct rhashtable); |
| 154 | } |
| 155 | |
| 156 | static int lockdep_nfnl_lock_is_held(void) |
| 157 | { |
| 158 | return lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 159 | } |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 160 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 161 | static int nft_hash_init(const struct nft_set *set, |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 162 | const struct nft_set_desc *desc, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 163 | const struct nlattr * const tb[]) |
| 164 | { |
Thomas Graf | cfe4a9d | 2014-08-02 11:47:46 +0200 | [diff] [blame] | 165 | struct rhashtable *priv = nft_set_priv(set); |
| 166 | struct rhashtable_params params = { |
| 167 | .nelem_hint = desc->size ? : NFT_HASH_ELEMENT_HINT, |
| 168 | .head_offset = offsetof(struct nft_hash_elem, node), |
| 169 | .key_offset = offsetof(struct nft_hash_elem, key), |
| 170 | .key_len = set->klen, |
| 171 | .hashfn = jhash, |
| 172 | .grow_decision = rht_grow_above_75, |
| 173 | .shrink_decision = rht_shrink_below_30, |
| 174 | .mutex_is_held = lockdep_nfnl_lock_is_held, |
| 175 | }; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 176 | |
Thomas Graf | cfe4a9d | 2014-08-02 11:47:46 +0200 | [diff] [blame] | 177 | return rhashtable_init(priv, ¶ms); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 178 | } |
| 179 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 180 | static void nft_hash_destroy(const struct nft_set *set) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 181 | { |
Thomas Graf | cfe4a9d | 2014-08-02 11:47:46 +0200 | [diff] [blame] | 182 | const struct rhashtable *priv = nft_set_priv(set); |
| 183 | const struct bucket_table *tbl; |
Patrick McHardy | ce6eb0d | 2014-03-04 16:21:51 +0100 | [diff] [blame] | 184 | struct nft_hash_elem *he, *next; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 185 | unsigned int i; |
| 186 | |
Thomas Graf | cfe4a9d | 2014-08-02 11:47:46 +0200 | [diff] [blame] | 187 | tbl = rht_dereference(priv->tbl, priv); |
| 188 | for (i = 0; i < tbl->size; i++) |
| 189 | rht_for_each_entry_safe(he, next, tbl->buckets[i], priv, node) |
Patrick McHardy | ce6eb0d | 2014-03-04 16:21:51 +0100 | [diff] [blame] | 190 | nft_hash_elem_destroy(set, he); |
Thomas Graf | cfe4a9d | 2014-08-02 11:47:46 +0200 | [diff] [blame] | 191 | |
| 192 | rhashtable_destroy(priv); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 193 | } |
| 194 | |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 195 | static bool nft_hash_estimate(const struct nft_set_desc *desc, u32 features, |
| 196 | struct nft_set_estimate *est) |
| 197 | { |
| 198 | unsigned int esize; |
| 199 | |
| 200 | esize = sizeof(struct nft_hash_elem); |
| 201 | if (features & NFT_SET_MAP) |
| 202 | esize += FIELD_SIZEOF(struct nft_hash_elem, data[0]); |
| 203 | |
| 204 | if (desc->size) { |
Thomas Graf | cfe4a9d | 2014-08-02 11:47:46 +0200 | [diff] [blame] | 205 | est->size = sizeof(struct rhashtable) + |
| 206 | roundup_pow_of_two(desc->size * 4 / 3) * |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 207 | sizeof(struct nft_hash_elem *) + |
| 208 | desc->size * esize; |
| 209 | } else { |
| 210 | /* Resizing happens when the load drops below 30% or goes |
| 211 | * above 75%. The average of 52.5% load (approximated by 50%) |
| 212 | * is used for the size estimation of the hash buckets, |
| 213 | * meaning we calculate two buckets per element. |
| 214 | */ |
| 215 | est->size = esize + 2 * sizeof(struct nft_hash_elem *); |
| 216 | } |
| 217 | |
| 218 | est->class = NFT_SET_CLASS_O_1; |
| 219 | |
| 220 | return true; |
| 221 | } |
| 222 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 223 | static struct nft_set_ops nft_hash_ops __read_mostly = { |
| 224 | .privsize = nft_hash_privsize, |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 225 | .estimate = nft_hash_estimate, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 226 | .init = nft_hash_init, |
| 227 | .destroy = nft_hash_destroy, |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 228 | .get = nft_hash_get, |
| 229 | .insert = nft_hash_insert, |
| 230 | .remove = nft_hash_remove, |
| 231 | .lookup = nft_hash_lookup, |
| 232 | .walk = nft_hash_walk, |
| 233 | .features = NFT_SET_MAP, |
| 234 | .owner = THIS_MODULE, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 235 | }; |
| 236 | |
| 237 | static int __init nft_hash_module_init(void) |
| 238 | { |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 239 | return nft_register_set(&nft_hash_ops); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 240 | } |
| 241 | |
| 242 | static void __exit nft_hash_module_exit(void) |
| 243 | { |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 244 | nft_unregister_set(&nft_hash_ops); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 245 | } |
| 246 | |
| 247 | module_init(nft_hash_module_init); |
| 248 | module_exit(nft_hash_module_exit); |
| 249 | |
| 250 | MODULE_LICENSE("GPL"); |
| 251 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 252 | MODULE_ALIAS_NFT_SET(); |