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> |
Patrick McHardy | 9d09829 | 2015-03-26 12:39:40 +0000 | [diff] [blame] | 18 | #include <linux/workqueue.h> |
Thomas Graf | cfe4a9d | 2014-08-02 11:47:46 +0200 | [diff] [blame] | 19 | #include <linux/rhashtable.h> |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 20 | #include <linux/netfilter.h> |
| 21 | #include <linux/netfilter/nf_tables.h> |
| 22 | #include <net/netfilter/nf_tables.h> |
| 23 | |
Thomas Graf | cfe4a9d | 2014-08-02 11:47:46 +0200 | [diff] [blame] | 24 | /* We target a hash table size of 4, element hint is 75% of final size */ |
| 25 | #define NFT_HASH_ELEMENT_HINT 3 |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 26 | |
Patrick McHardy | 745f545 | 2015-03-25 13:07:46 +0000 | [diff] [blame] | 27 | struct nft_hash { |
| 28 | struct rhashtable ht; |
Patrick McHardy | 9d09829 | 2015-03-26 12:39:40 +0000 | [diff] [blame] | 29 | struct delayed_work gc_work; |
Patrick McHardy | 745f545 | 2015-03-25 13:07:46 +0000 | [diff] [blame] | 30 | }; |
| 31 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 32 | struct nft_hash_elem { |
Thomas Graf | cfe4a9d | 2014-08-02 11:47:46 +0200 | [diff] [blame] | 33 | struct rhash_head node; |
Patrick McHardy | fe2811e | 2015-03-25 13:07:50 +0000 | [diff] [blame] | 34 | struct nft_set_ext ext; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 35 | }; |
| 36 | |
Patrick McHardy | bfd6e32 | 2015-03-25 13:07:48 +0000 | [diff] [blame] | 37 | struct nft_hash_cmp_arg { |
| 38 | const struct nft_set *set; |
| 39 | const struct nft_data *key; |
Patrick McHardy | cc02e45 | 2015-03-25 14:08:50 +0000 | [diff] [blame] | 40 | u8 genmask; |
Patrick McHardy | bfd6e32 | 2015-03-25 13:07:48 +0000 | [diff] [blame] | 41 | }; |
| 42 | |
Herbert Xu | fa37732 | 2015-03-20 21:57:02 +1100 | [diff] [blame] | 43 | static const struct rhashtable_params nft_hash_params; |
| 44 | |
Patrick McHardy | bfd6e32 | 2015-03-25 13:07:48 +0000 | [diff] [blame] | 45 | static inline u32 nft_hash_key(const void *data, u32 len, u32 seed) |
| 46 | { |
| 47 | const struct nft_hash_cmp_arg *arg = data; |
| 48 | |
| 49 | return jhash(arg->key, len, seed); |
| 50 | } |
| 51 | |
| 52 | static inline u32 nft_hash_obj(const void *data, u32 len, u32 seed) |
| 53 | { |
| 54 | const struct nft_hash_elem *he = data; |
| 55 | |
Patrick McHardy | fe2811e | 2015-03-25 13:07:50 +0000 | [diff] [blame] | 56 | return jhash(nft_set_ext_key(&he->ext), len, seed); |
Patrick McHardy | bfd6e32 | 2015-03-25 13:07:48 +0000 | [diff] [blame] | 57 | } |
| 58 | |
| 59 | static inline int nft_hash_cmp(struct rhashtable_compare_arg *arg, |
| 60 | const void *ptr) |
| 61 | { |
| 62 | const struct nft_hash_cmp_arg *x = arg->key; |
| 63 | const struct nft_hash_elem *he = ptr; |
| 64 | |
Patrick McHardy | e562d86 | 2015-04-11 02:27:34 +0100 | [diff] [blame^] | 65 | if (memcmp(nft_set_ext_key(&he->ext), x->key, x->set->klen)) |
Patrick McHardy | bfd6e32 | 2015-03-25 13:07:48 +0000 | [diff] [blame] | 66 | return 1; |
Patrick McHardy | 9d09829 | 2015-03-26 12:39:40 +0000 | [diff] [blame] | 67 | if (nft_set_elem_expired(&he->ext)) |
| 68 | return 1; |
Patrick McHardy | cc02e45 | 2015-03-25 14:08:50 +0000 | [diff] [blame] | 69 | if (!nft_set_elem_active(&he->ext, x->genmask)) |
| 70 | return 1; |
Patrick McHardy | bfd6e32 | 2015-03-25 13:07:48 +0000 | [diff] [blame] | 71 | return 0; |
| 72 | } |
| 73 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 74 | static bool nft_hash_lookup(const struct nft_set *set, |
| 75 | const struct nft_data *key, |
Patrick McHardy | b2832dd | 2015-03-25 14:08:48 +0000 | [diff] [blame] | 76 | const struct nft_set_ext **ext) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 77 | { |
Patrick McHardy | 745f545 | 2015-03-25 13:07:46 +0000 | [diff] [blame] | 78 | struct nft_hash *priv = nft_set_priv(set); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 79 | const struct nft_hash_elem *he; |
Patrick McHardy | bfd6e32 | 2015-03-25 13:07:48 +0000 | [diff] [blame] | 80 | struct nft_hash_cmp_arg arg = { |
Patrick McHardy | cc02e45 | 2015-03-25 14:08:50 +0000 | [diff] [blame] | 81 | .genmask = nft_genmask_cur(read_pnet(&set->pnet)), |
Patrick McHardy | bfd6e32 | 2015-03-25 13:07:48 +0000 | [diff] [blame] | 82 | .set = set, |
| 83 | .key = key, |
| 84 | }; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 85 | |
Patrick McHardy | bfd6e32 | 2015-03-25 13:07:48 +0000 | [diff] [blame] | 86 | he = rhashtable_lookup_fast(&priv->ht, &arg, nft_hash_params); |
Patrick McHardy | b2832dd | 2015-03-25 14:08:48 +0000 | [diff] [blame] | 87 | if (he != NULL) |
| 88 | *ext = &he->ext; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 89 | |
Thomas Graf | cfe4a9d | 2014-08-02 11:47:46 +0200 | [diff] [blame] | 90 | return !!he; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 91 | } |
| 92 | |
Patrick McHardy | 22fe54d | 2015-04-05 14:41:08 +0200 | [diff] [blame] | 93 | static bool nft_hash_update(struct nft_set *set, const struct nft_data *key, |
| 94 | void *(*new)(struct nft_set *, |
| 95 | const struct nft_expr *, |
Patrick McHardy | a55e22e | 2015-04-11 02:27:31 +0100 | [diff] [blame] | 96 | struct nft_regs *regs), |
Patrick McHardy | 22fe54d | 2015-04-05 14:41:08 +0200 | [diff] [blame] | 97 | const struct nft_expr *expr, |
Patrick McHardy | a55e22e | 2015-04-11 02:27:31 +0100 | [diff] [blame] | 98 | struct nft_regs *regs, |
Patrick McHardy | 22fe54d | 2015-04-05 14:41:08 +0200 | [diff] [blame] | 99 | const struct nft_set_ext **ext) |
| 100 | { |
| 101 | struct nft_hash *priv = nft_set_priv(set); |
| 102 | struct nft_hash_elem *he; |
| 103 | struct nft_hash_cmp_arg arg = { |
| 104 | .genmask = NFT_GENMASK_ANY, |
| 105 | .set = set, |
| 106 | .key = key, |
| 107 | }; |
| 108 | |
| 109 | he = rhashtable_lookup_fast(&priv->ht, &arg, nft_hash_params); |
| 110 | if (he != NULL) |
| 111 | goto out; |
| 112 | |
Patrick McHardy | a55e22e | 2015-04-11 02:27:31 +0100 | [diff] [blame] | 113 | he = new(set, expr, regs); |
Patrick McHardy | 22fe54d | 2015-04-05 14:41:08 +0200 | [diff] [blame] | 114 | if (he == NULL) |
| 115 | goto err1; |
| 116 | if (rhashtable_lookup_insert_key(&priv->ht, &arg, &he->node, |
| 117 | nft_hash_params)) |
| 118 | goto err2; |
| 119 | out: |
| 120 | *ext = &he->ext; |
| 121 | return true; |
| 122 | |
| 123 | err2: |
| 124 | nft_set_elem_destroy(set, he); |
| 125 | err1: |
| 126 | return false; |
| 127 | } |
| 128 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 129 | static int nft_hash_insert(const struct nft_set *set, |
| 130 | const struct nft_set_elem *elem) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 131 | { |
Patrick McHardy | 745f545 | 2015-03-25 13:07:46 +0000 | [diff] [blame] | 132 | struct nft_hash *priv = nft_set_priv(set); |
Patrick McHardy | fe2811e | 2015-03-25 13:07:50 +0000 | [diff] [blame] | 133 | struct nft_hash_elem *he = elem->priv; |
Patrick McHardy | bfd6e32 | 2015-03-25 13:07:48 +0000 | [diff] [blame] | 134 | struct nft_hash_cmp_arg arg = { |
Patrick McHardy | cc02e45 | 2015-03-25 14:08:50 +0000 | [diff] [blame] | 135 | .genmask = nft_genmask_next(read_pnet(&set->pnet)), |
Patrick McHardy | bfd6e32 | 2015-03-25 13:07:48 +0000 | [diff] [blame] | 136 | .set = set, |
| 137 | .key = &elem->key, |
| 138 | }; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 139 | |
Patrick McHardy | fe2811e | 2015-03-25 13:07:50 +0000 | [diff] [blame] | 140 | return rhashtable_lookup_insert_key(&priv->ht, &arg, &he->node, |
| 141 | nft_hash_params); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 142 | } |
| 143 | |
Patrick McHardy | cc02e45 | 2015-03-25 14:08:50 +0000 | [diff] [blame] | 144 | static void nft_hash_activate(const struct nft_set *set, |
| 145 | const struct nft_set_elem *elem) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 146 | { |
Patrick McHardy | cc02e45 | 2015-03-25 14:08:50 +0000 | [diff] [blame] | 147 | struct nft_hash_elem *he = elem->priv; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 148 | |
Patrick McHardy | cc02e45 | 2015-03-25 14:08:50 +0000 | [diff] [blame] | 149 | nft_set_elem_change_active(set, &he->ext); |
Patrick McHardy | 9d09829 | 2015-03-26 12:39:40 +0000 | [diff] [blame] | 150 | nft_set_elem_clear_busy(&he->ext); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 151 | } |
| 152 | |
Patrick McHardy | cc02e45 | 2015-03-25 14:08:50 +0000 | [diff] [blame] | 153 | static void *nft_hash_deactivate(const struct nft_set *set, |
| 154 | const struct nft_set_elem *elem) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 155 | { |
Patrick McHardy | 745f545 | 2015-03-25 13:07:46 +0000 | [diff] [blame] | 156 | struct nft_hash *priv = nft_set_priv(set); |
Herbert Xu | fa37732 | 2015-03-20 21:57:02 +1100 | [diff] [blame] | 157 | struct nft_hash_elem *he; |
Patrick McHardy | bfd6e32 | 2015-03-25 13:07:48 +0000 | [diff] [blame] | 158 | struct nft_hash_cmp_arg arg = { |
Patrick McHardy | cc02e45 | 2015-03-25 14:08:50 +0000 | [diff] [blame] | 159 | .genmask = nft_genmask_next(read_pnet(&set->pnet)), |
Patrick McHardy | bfd6e32 | 2015-03-25 13:07:48 +0000 | [diff] [blame] | 160 | .set = set, |
| 161 | .key = &elem->key, |
| 162 | }; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 163 | |
Patrick McHardy | 9d09829 | 2015-03-26 12:39:40 +0000 | [diff] [blame] | 164 | rcu_read_lock(); |
Patrick McHardy | bfd6e32 | 2015-03-25 13:07:48 +0000 | [diff] [blame] | 165 | he = rhashtable_lookup_fast(&priv->ht, &arg, nft_hash_params); |
Patrick McHardy | 9d09829 | 2015-03-26 12:39:40 +0000 | [diff] [blame] | 166 | if (he != NULL) { |
| 167 | if (!nft_set_elem_mark_busy(&he->ext)) |
| 168 | nft_set_elem_change_active(set, &he->ext); |
| 169 | else |
| 170 | he = NULL; |
| 171 | } |
| 172 | rcu_read_unlock(); |
Thomas Graf | 8d24c0b | 2015-01-02 23:00:14 +0100 | [diff] [blame] | 173 | |
Patrick McHardy | cc02e45 | 2015-03-25 14:08:50 +0000 | [diff] [blame] | 174 | return he; |
| 175 | } |
Herbert Xu | fa37732 | 2015-03-20 21:57:02 +1100 | [diff] [blame] | 176 | |
Patrick McHardy | cc02e45 | 2015-03-25 14:08:50 +0000 | [diff] [blame] | 177 | static void nft_hash_remove(const struct nft_set *set, |
| 178 | const struct nft_set_elem *elem) |
| 179 | { |
| 180 | struct nft_hash *priv = nft_set_priv(set); |
| 181 | struct nft_hash_elem *he = elem->priv; |
| 182 | |
| 183 | rhashtable_remove_fast(&priv->ht, &he->node, nft_hash_params); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 184 | } |
| 185 | |
| 186 | static void nft_hash_walk(const struct nft_ctx *ctx, const struct nft_set *set, |
| 187 | struct nft_set_iter *iter) |
| 188 | { |
Patrick McHardy | 745f545 | 2015-03-25 13:07:46 +0000 | [diff] [blame] | 189 | struct nft_hash *priv = nft_set_priv(set); |
Patrick McHardy | fe2811e | 2015-03-25 13:07:50 +0000 | [diff] [blame] | 190 | struct nft_hash_elem *he; |
Herbert Xu | 9a77662 | 2015-02-04 07:33:25 +1100 | [diff] [blame] | 191 | struct rhashtable_iter hti; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 192 | struct nft_set_elem elem; |
Patrick McHardy | cc02e45 | 2015-03-25 14:08:50 +0000 | [diff] [blame] | 193 | u8 genmask = nft_genmask_cur(read_pnet(&set->pnet)); |
Herbert Xu | 9a77662 | 2015-02-04 07:33:25 +1100 | [diff] [blame] | 194 | int err; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 195 | |
Patrick McHardy | 745f545 | 2015-03-25 13:07:46 +0000 | [diff] [blame] | 196 | err = rhashtable_walk_init(&priv->ht, &hti); |
Herbert Xu | 9a77662 | 2015-02-04 07:33:25 +1100 | [diff] [blame] | 197 | iter->err = err; |
| 198 | if (err) |
| 199 | return; |
Thomas Graf | 88d6ed1 | 2015-01-02 23:00:16 +0100 | [diff] [blame] | 200 | |
Herbert Xu | 9a77662 | 2015-02-04 07:33:25 +1100 | [diff] [blame] | 201 | err = rhashtable_walk_start(&hti); |
| 202 | if (err && err != -EAGAIN) { |
| 203 | iter->err = err; |
| 204 | goto out; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 205 | } |
Herbert Xu | 9a77662 | 2015-02-04 07:33:25 +1100 | [diff] [blame] | 206 | |
| 207 | while ((he = rhashtable_walk_next(&hti))) { |
| 208 | if (IS_ERR(he)) { |
| 209 | err = PTR_ERR(he); |
| 210 | if (err != -EAGAIN) { |
| 211 | iter->err = err; |
| 212 | goto out; |
| 213 | } |
Herbert Xu | d8bdff5 | 2015-03-13 10:52:14 +1100 | [diff] [blame] | 214 | |
| 215 | continue; |
Herbert Xu | 9a77662 | 2015-02-04 07:33:25 +1100 | [diff] [blame] | 216 | } |
| 217 | |
| 218 | if (iter->count < iter->skip) |
| 219 | goto cont; |
Patrick McHardy | 9d09829 | 2015-03-26 12:39:40 +0000 | [diff] [blame] | 220 | if (nft_set_elem_expired(&he->ext)) |
| 221 | goto cont; |
Patrick McHardy | cc02e45 | 2015-03-25 14:08:50 +0000 | [diff] [blame] | 222 | if (!nft_set_elem_active(&he->ext, genmask)) |
| 223 | goto cont; |
Herbert Xu | 9a77662 | 2015-02-04 07:33:25 +1100 | [diff] [blame] | 224 | |
Patrick McHardy | fe2811e | 2015-03-25 13:07:50 +0000 | [diff] [blame] | 225 | elem.priv = he; |
Herbert Xu | 9a77662 | 2015-02-04 07:33:25 +1100 | [diff] [blame] | 226 | |
| 227 | iter->err = iter->fn(ctx, set, iter, &elem); |
| 228 | if (iter->err < 0) |
| 229 | goto out; |
| 230 | |
| 231 | cont: |
| 232 | iter->count++; |
| 233 | } |
| 234 | |
| 235 | out: |
| 236 | rhashtable_walk_stop(&hti); |
| 237 | rhashtable_walk_exit(&hti); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 238 | } |
| 239 | |
Patrick McHardy | 9d09829 | 2015-03-26 12:39:40 +0000 | [diff] [blame] | 240 | static void nft_hash_gc(struct work_struct *work) |
| 241 | { |
Patrick McHardy | 3dd0673 | 2015-04-05 14:41:06 +0200 | [diff] [blame] | 242 | struct nft_set *set; |
Patrick McHardy | 9d09829 | 2015-03-26 12:39:40 +0000 | [diff] [blame] | 243 | struct nft_hash_elem *he; |
| 244 | struct nft_hash *priv; |
| 245 | struct nft_set_gc_batch *gcb = NULL; |
| 246 | struct rhashtable_iter hti; |
| 247 | int err; |
| 248 | |
| 249 | priv = container_of(work, struct nft_hash, gc_work.work); |
| 250 | set = nft_set_container_of(priv); |
| 251 | |
| 252 | err = rhashtable_walk_init(&priv->ht, &hti); |
| 253 | if (err) |
| 254 | goto schedule; |
| 255 | |
| 256 | err = rhashtable_walk_start(&hti); |
| 257 | if (err && err != -EAGAIN) |
| 258 | goto out; |
| 259 | |
| 260 | while ((he = rhashtable_walk_next(&hti))) { |
| 261 | if (IS_ERR(he)) { |
| 262 | if (PTR_ERR(he) != -EAGAIN) |
| 263 | goto out; |
| 264 | continue; |
| 265 | } |
| 266 | |
| 267 | if (!nft_set_elem_expired(&he->ext)) |
| 268 | continue; |
| 269 | if (nft_set_elem_mark_busy(&he->ext)) |
| 270 | continue; |
| 271 | |
| 272 | gcb = nft_set_gc_batch_check(set, gcb, GFP_ATOMIC); |
| 273 | if (gcb == NULL) |
| 274 | goto out; |
| 275 | rhashtable_remove_fast(&priv->ht, &he->node, nft_hash_params); |
Patrick McHardy | 3dd0673 | 2015-04-05 14:41:06 +0200 | [diff] [blame] | 276 | atomic_dec(&set->nelems); |
Patrick McHardy | 9d09829 | 2015-03-26 12:39:40 +0000 | [diff] [blame] | 277 | nft_set_gc_batch_add(gcb, he); |
| 278 | } |
| 279 | out: |
| 280 | rhashtable_walk_stop(&hti); |
| 281 | rhashtable_walk_exit(&hti); |
| 282 | |
| 283 | nft_set_gc_batch_complete(gcb); |
| 284 | schedule: |
| 285 | queue_delayed_work(system_power_efficient_wq, &priv->gc_work, |
| 286 | nft_set_gc_interval(set)); |
| 287 | } |
| 288 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 289 | static unsigned int nft_hash_privsize(const struct nlattr * const nla[]) |
| 290 | { |
Patrick McHardy | 745f545 | 2015-03-25 13:07:46 +0000 | [diff] [blame] | 291 | return sizeof(struct nft_hash); |
Thomas Graf | cfe4a9d | 2014-08-02 11:47:46 +0200 | [diff] [blame] | 292 | } |
| 293 | |
Herbert Xu | fa37732 | 2015-03-20 21:57:02 +1100 | [diff] [blame] | 294 | static const struct rhashtable_params nft_hash_params = { |
Patrick McHardy | 45d8475 | 2015-03-25 13:07:47 +0000 | [diff] [blame] | 295 | .head_offset = offsetof(struct nft_hash_elem, node), |
Patrick McHardy | bfd6e32 | 2015-03-25 13:07:48 +0000 | [diff] [blame] | 296 | .hashfn = nft_hash_key, |
| 297 | .obj_hashfn = nft_hash_obj, |
| 298 | .obj_cmpfn = nft_hash_cmp, |
Patrick McHardy | 45d8475 | 2015-03-25 13:07:47 +0000 | [diff] [blame] | 299 | .automatic_shrinking = true, |
Herbert Xu | fa37732 | 2015-03-20 21:57:02 +1100 | [diff] [blame] | 300 | }; |
| 301 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 302 | static int nft_hash_init(const struct nft_set *set, |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 303 | const struct nft_set_desc *desc, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 304 | const struct nlattr * const tb[]) |
| 305 | { |
Patrick McHardy | 745f545 | 2015-03-25 13:07:46 +0000 | [diff] [blame] | 306 | struct nft_hash *priv = nft_set_priv(set); |
Herbert Xu | fa37732 | 2015-03-20 21:57:02 +1100 | [diff] [blame] | 307 | struct rhashtable_params params = nft_hash_params; |
Patrick McHardy | 9d09829 | 2015-03-26 12:39:40 +0000 | [diff] [blame] | 308 | int err; |
Herbert Xu | fa37732 | 2015-03-20 21:57:02 +1100 | [diff] [blame] | 309 | |
| 310 | params.nelem_hint = desc->size ?: NFT_HASH_ELEMENT_HINT; |
Patrick McHardy | 45d8475 | 2015-03-25 13:07:47 +0000 | [diff] [blame] | 311 | params.key_len = set->klen; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 312 | |
Patrick McHardy | 9d09829 | 2015-03-26 12:39:40 +0000 | [diff] [blame] | 313 | err = rhashtable_init(&priv->ht, ¶ms); |
| 314 | if (err < 0) |
| 315 | return err; |
| 316 | |
| 317 | INIT_DEFERRABLE_WORK(&priv->gc_work, nft_hash_gc); |
| 318 | if (set->flags & NFT_SET_TIMEOUT) |
| 319 | queue_delayed_work(system_power_efficient_wq, &priv->gc_work, |
| 320 | nft_set_gc_interval(set)); |
| 321 | return 0; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 322 | } |
| 323 | |
Patrick McHardy | 61edafb | 2015-03-25 14:08:47 +0000 | [diff] [blame] | 324 | static void nft_hash_elem_destroy(void *ptr, void *arg) |
Thomas Graf | 6b6f302 | 2015-03-24 14:18:20 +0100 | [diff] [blame] | 325 | { |
Patrick McHardy | 61edafb | 2015-03-25 14:08:47 +0000 | [diff] [blame] | 326 | nft_set_elem_destroy((const struct nft_set *)arg, ptr); |
Thomas Graf | 6b6f302 | 2015-03-24 14:18:20 +0100 | [diff] [blame] | 327 | } |
| 328 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 329 | static void nft_hash_destroy(const struct nft_set *set) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 330 | { |
Patrick McHardy | 745f545 | 2015-03-25 13:07:46 +0000 | [diff] [blame] | 331 | struct nft_hash *priv = nft_set_priv(set); |
| 332 | |
Patrick McHardy | 9d09829 | 2015-03-26 12:39:40 +0000 | [diff] [blame] | 333 | cancel_delayed_work_sync(&priv->gc_work); |
Patrick McHardy | 61edafb | 2015-03-25 14:08:47 +0000 | [diff] [blame] | 334 | rhashtable_free_and_destroy(&priv->ht, nft_hash_elem_destroy, |
| 335 | (void *)set); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 336 | } |
| 337 | |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 338 | static bool nft_hash_estimate(const struct nft_set_desc *desc, u32 features, |
| 339 | struct nft_set_estimate *est) |
| 340 | { |
| 341 | unsigned int esize; |
| 342 | |
| 343 | esize = sizeof(struct nft_hash_elem); |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 344 | if (desc->size) { |
Patrick McHardy | 745f545 | 2015-03-25 13:07:46 +0000 | [diff] [blame] | 345 | est->size = sizeof(struct nft_hash) + |
Thomas Graf | cfe4a9d | 2014-08-02 11:47:46 +0200 | [diff] [blame] | 346 | roundup_pow_of_two(desc->size * 4 / 3) * |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 347 | sizeof(struct nft_hash_elem *) + |
| 348 | desc->size * esize; |
| 349 | } else { |
| 350 | /* Resizing happens when the load drops below 30% or goes |
| 351 | * above 75%. The average of 52.5% load (approximated by 50%) |
| 352 | * is used for the size estimation of the hash buckets, |
| 353 | * meaning we calculate two buckets per element. |
| 354 | */ |
| 355 | est->size = esize + 2 * sizeof(struct nft_hash_elem *); |
| 356 | } |
| 357 | |
| 358 | est->class = NFT_SET_CLASS_O_1; |
| 359 | |
| 360 | return true; |
| 361 | } |
| 362 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 363 | static struct nft_set_ops nft_hash_ops __read_mostly = { |
| 364 | .privsize = nft_hash_privsize, |
Patrick McHardy | fe2811e | 2015-03-25 13:07:50 +0000 | [diff] [blame] | 365 | .elemsize = offsetof(struct nft_hash_elem, ext), |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 366 | .estimate = nft_hash_estimate, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 367 | .init = nft_hash_init, |
| 368 | .destroy = nft_hash_destroy, |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 369 | .insert = nft_hash_insert, |
Patrick McHardy | cc02e45 | 2015-03-25 14:08:50 +0000 | [diff] [blame] | 370 | .activate = nft_hash_activate, |
| 371 | .deactivate = nft_hash_deactivate, |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 372 | .remove = nft_hash_remove, |
| 373 | .lookup = nft_hash_lookup, |
Patrick McHardy | 22fe54d | 2015-04-05 14:41:08 +0200 | [diff] [blame] | 374 | .update = nft_hash_update, |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 375 | .walk = nft_hash_walk, |
Patrick McHardy | 9d09829 | 2015-03-26 12:39:40 +0000 | [diff] [blame] | 376 | .features = NFT_SET_MAP | NFT_SET_TIMEOUT, |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 377 | .owner = THIS_MODULE, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 378 | }; |
| 379 | |
| 380 | static int __init nft_hash_module_init(void) |
| 381 | { |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 382 | return nft_register_set(&nft_hash_ops); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 383 | } |
| 384 | |
| 385 | static void __exit nft_hash_module_exit(void) |
| 386 | { |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 387 | nft_unregister_set(&nft_hash_ops); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 388 | } |
| 389 | |
| 390 | module_init(nft_hash_module_init); |
| 391 | module_exit(nft_hash_module_exit); |
| 392 | |
| 393 | MODULE_LICENSE("GPL"); |
| 394 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 395 | MODULE_ALIAS_NFT_SET(); |