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; |
Patrick McHardy | 8cd8937 | 2015-04-11 02:27:35 +0100 | [diff] [blame] | 39 | const u32 *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 | |
Pablo Neira Ayuso | 42a5576 | 2016-07-08 14:41:49 +0200 | [diff] [blame] | 74 | static bool nft_hash_lookup(const struct net *net, const struct nft_set *set, |
| 75 | const u32 *key, const struct nft_set_ext **ext) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 76 | { |
Patrick McHardy | 745f545 | 2015-03-25 13:07:46 +0000 | [diff] [blame] | 77 | struct nft_hash *priv = nft_set_priv(set); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 78 | const struct nft_hash_elem *he; |
Patrick McHardy | bfd6e32 | 2015-03-25 13:07:48 +0000 | [diff] [blame] | 79 | struct nft_hash_cmp_arg arg = { |
Pablo Neira Ayuso | 42a5576 | 2016-07-08 14:41:49 +0200 | [diff] [blame] | 80 | .genmask = nft_genmask_cur(net), |
Patrick McHardy | bfd6e32 | 2015-03-25 13:07:48 +0000 | [diff] [blame] | 81 | .set = set, |
| 82 | .key = key, |
| 83 | }; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 84 | |
Patrick McHardy | bfd6e32 | 2015-03-25 13:07:48 +0000 | [diff] [blame] | 85 | he = rhashtable_lookup_fast(&priv->ht, &arg, nft_hash_params); |
Patrick McHardy | b2832dd | 2015-03-25 14:08:48 +0000 | [diff] [blame] | 86 | if (he != NULL) |
| 87 | *ext = &he->ext; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 88 | |
Thomas Graf | cfe4a9d | 2014-08-02 11:47:46 +0200 | [diff] [blame] | 89 | return !!he; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 90 | } |
| 91 | |
Patrick McHardy | 8cd8937 | 2015-04-11 02:27:35 +0100 | [diff] [blame] | 92 | static bool nft_hash_update(struct nft_set *set, const u32 *key, |
Patrick McHardy | 22fe54d | 2015-04-05 14:41:08 +0200 | [diff] [blame] | 93 | void *(*new)(struct nft_set *, |
| 94 | const struct nft_expr *, |
Patrick McHardy | a55e22e | 2015-04-11 02:27:31 +0100 | [diff] [blame] | 95 | struct nft_regs *regs), |
Patrick McHardy | 22fe54d | 2015-04-05 14:41:08 +0200 | [diff] [blame] | 96 | const struct nft_expr *expr, |
Patrick McHardy | a55e22e | 2015-04-11 02:27:31 +0100 | [diff] [blame] | 97 | struct nft_regs *regs, |
Patrick McHardy | 22fe54d | 2015-04-05 14:41:08 +0200 | [diff] [blame] | 98 | const struct nft_set_ext **ext) |
| 99 | { |
| 100 | struct nft_hash *priv = nft_set_priv(set); |
Liping Zhang | dab4506 | 2016-10-22 18:51:26 +0800 | [diff] [blame] | 101 | struct nft_hash_elem *he, *prev; |
Patrick McHardy | 22fe54d | 2015-04-05 14:41:08 +0200 | [diff] [blame] | 102 | struct nft_hash_cmp_arg arg = { |
| 103 | .genmask = NFT_GENMASK_ANY, |
| 104 | .set = set, |
| 105 | .key = key, |
| 106 | }; |
| 107 | |
| 108 | he = rhashtable_lookup_fast(&priv->ht, &arg, nft_hash_params); |
| 109 | if (he != NULL) |
| 110 | goto out; |
| 111 | |
Patrick McHardy | a55e22e | 2015-04-11 02:27:31 +0100 | [diff] [blame] | 112 | he = new(set, expr, regs); |
Patrick McHardy | 22fe54d | 2015-04-05 14:41:08 +0200 | [diff] [blame] | 113 | if (he == NULL) |
| 114 | goto err1; |
Liping Zhang | dab4506 | 2016-10-22 18:51:26 +0800 | [diff] [blame] | 115 | |
| 116 | prev = rhashtable_lookup_get_insert_key(&priv->ht, &arg, &he->node, |
| 117 | nft_hash_params); |
| 118 | if (IS_ERR(prev)) |
Patrick McHardy | 22fe54d | 2015-04-05 14:41:08 +0200 | [diff] [blame] | 119 | goto err2; |
Liping Zhang | dab4506 | 2016-10-22 18:51:26 +0800 | [diff] [blame] | 120 | |
| 121 | /* Another cpu may race to insert the element with the same key */ |
| 122 | if (prev) { |
| 123 | nft_set_elem_destroy(set, he, true); |
| 124 | he = prev; |
| 125 | } |
| 126 | |
Patrick McHardy | 22fe54d | 2015-04-05 14:41:08 +0200 | [diff] [blame] | 127 | out: |
| 128 | *ext = &he->ext; |
| 129 | return true; |
| 130 | |
| 131 | err2: |
Liping Zhang | 61f9e29 | 2016-10-22 18:51:25 +0800 | [diff] [blame] | 132 | nft_set_elem_destroy(set, he, true); |
Patrick McHardy | 22fe54d | 2015-04-05 14:41:08 +0200 | [diff] [blame] | 133 | err1: |
| 134 | return false; |
| 135 | } |
| 136 | |
Pablo Neira Ayuso | 42a5576 | 2016-07-08 14:41:49 +0200 | [diff] [blame] | 137 | static int nft_hash_insert(const struct net *net, const struct nft_set *set, |
Pablo Neira Ayuso | c016c7e | 2016-08-24 12:41:54 +0200 | [diff] [blame] | 138 | const struct nft_set_elem *elem, |
| 139 | struct nft_set_ext **ext) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 140 | { |
Patrick McHardy | 745f545 | 2015-03-25 13:07:46 +0000 | [diff] [blame] | 141 | struct nft_hash *priv = nft_set_priv(set); |
Patrick McHardy | fe2811e | 2015-03-25 13:07:50 +0000 | [diff] [blame] | 142 | struct nft_hash_elem *he = elem->priv; |
Patrick McHardy | bfd6e32 | 2015-03-25 13:07:48 +0000 | [diff] [blame] | 143 | struct nft_hash_cmp_arg arg = { |
Pablo Neira Ayuso | 42a5576 | 2016-07-08 14:41:49 +0200 | [diff] [blame] | 144 | .genmask = nft_genmask_next(net), |
Patrick McHardy | bfd6e32 | 2015-03-25 13:07:48 +0000 | [diff] [blame] | 145 | .set = set, |
Patrick McHardy | 7d74026 | 2015-04-11 02:27:39 +0100 | [diff] [blame] | 146 | .key = elem->key.val.data, |
Patrick McHardy | bfd6e32 | 2015-03-25 13:07:48 +0000 | [diff] [blame] | 147 | }; |
Pablo Neira Ayuso | c016c7e | 2016-08-24 12:41:54 +0200 | [diff] [blame] | 148 | struct nft_hash_elem *prev; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 149 | |
Pablo Neira Ayuso | c016c7e | 2016-08-24 12:41:54 +0200 | [diff] [blame] | 150 | prev = rhashtable_lookup_get_insert_key(&priv->ht, &arg, &he->node, |
| 151 | nft_hash_params); |
| 152 | if (IS_ERR(prev)) |
| 153 | return PTR_ERR(prev); |
| 154 | if (prev) { |
| 155 | *ext = &prev->ext; |
| 156 | return -EEXIST; |
| 157 | } |
| 158 | return 0; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 159 | } |
| 160 | |
Pablo Neira Ayuso | 42a5576 | 2016-07-08 14:41:49 +0200 | [diff] [blame] | 161 | static void nft_hash_activate(const struct net *net, const struct nft_set *set, |
Patrick McHardy | cc02e45 | 2015-03-25 14:08:50 +0000 | [diff] [blame] | 162 | const struct nft_set_elem *elem) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 163 | { |
Patrick McHardy | cc02e45 | 2015-03-25 14:08:50 +0000 | [diff] [blame] | 164 | struct nft_hash_elem *he = elem->priv; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 165 | |
Pablo Neira Ayuso | 42a5576 | 2016-07-08 14:41:49 +0200 | [diff] [blame] | 166 | nft_set_elem_change_active(net, set, &he->ext); |
Patrick McHardy | 9d09829 | 2015-03-26 12:39:40 +0000 | [diff] [blame] | 167 | nft_set_elem_clear_busy(&he->ext); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 168 | } |
| 169 | |
Pablo Neira Ayuso | 42a5576 | 2016-07-08 14:41:49 +0200 | [diff] [blame] | 170 | static void *nft_hash_deactivate(const struct net *net, |
| 171 | const struct nft_set *set, |
Patrick McHardy | cc02e45 | 2015-03-25 14:08:50 +0000 | [diff] [blame] | 172 | const struct nft_set_elem *elem) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 173 | { |
Patrick McHardy | 745f545 | 2015-03-25 13:07:46 +0000 | [diff] [blame] | 174 | struct nft_hash *priv = nft_set_priv(set); |
Herbert Xu | fa37732 | 2015-03-20 21:57:02 +1100 | [diff] [blame] | 175 | struct nft_hash_elem *he; |
Patrick McHardy | bfd6e32 | 2015-03-25 13:07:48 +0000 | [diff] [blame] | 176 | struct nft_hash_cmp_arg arg = { |
Pablo Neira Ayuso | 8eee54b | 2016-06-21 00:12:26 +0200 | [diff] [blame] | 177 | .genmask = nft_genmask_next(net), |
Patrick McHardy | bfd6e32 | 2015-03-25 13:07:48 +0000 | [diff] [blame] | 178 | .set = set, |
Patrick McHardy | 7d74026 | 2015-04-11 02:27:39 +0100 | [diff] [blame] | 179 | .key = elem->key.val.data, |
Patrick McHardy | bfd6e32 | 2015-03-25 13:07:48 +0000 | [diff] [blame] | 180 | }; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 181 | |
Patrick McHardy | 9d09829 | 2015-03-26 12:39:40 +0000 | [diff] [blame] | 182 | rcu_read_lock(); |
Patrick McHardy | bfd6e32 | 2015-03-25 13:07:48 +0000 | [diff] [blame] | 183 | he = rhashtable_lookup_fast(&priv->ht, &arg, nft_hash_params); |
Patrick McHardy | 9d09829 | 2015-03-26 12:39:40 +0000 | [diff] [blame] | 184 | if (he != NULL) { |
Pablo Neira Ayuso | 8eee54b | 2016-06-21 00:12:26 +0200 | [diff] [blame] | 185 | if (!nft_set_elem_mark_busy(&he->ext) || |
| 186 | !nft_is_active(net, &he->ext)) |
Pablo Neira Ayuso | 42a5576 | 2016-07-08 14:41:49 +0200 | [diff] [blame] | 187 | nft_set_elem_change_active(net, set, &he->ext); |
Patrick McHardy | 9d09829 | 2015-03-26 12:39:40 +0000 | [diff] [blame] | 188 | else |
| 189 | he = NULL; |
| 190 | } |
| 191 | rcu_read_unlock(); |
Thomas Graf | 8d24c0b | 2015-01-02 23:00:14 +0100 | [diff] [blame] | 192 | |
Patrick McHardy | cc02e45 | 2015-03-25 14:08:50 +0000 | [diff] [blame] | 193 | return he; |
| 194 | } |
Herbert Xu | fa37732 | 2015-03-20 21:57:02 +1100 | [diff] [blame] | 195 | |
Patrick McHardy | cc02e45 | 2015-03-25 14:08:50 +0000 | [diff] [blame] | 196 | static void nft_hash_remove(const struct nft_set *set, |
| 197 | const struct nft_set_elem *elem) |
| 198 | { |
| 199 | struct nft_hash *priv = nft_set_priv(set); |
| 200 | struct nft_hash_elem *he = elem->priv; |
| 201 | |
| 202 | rhashtable_remove_fast(&priv->ht, &he->node, nft_hash_params); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 203 | } |
| 204 | |
| 205 | static void nft_hash_walk(const struct nft_ctx *ctx, const struct nft_set *set, |
| 206 | struct nft_set_iter *iter) |
| 207 | { |
Patrick McHardy | 745f545 | 2015-03-25 13:07:46 +0000 | [diff] [blame] | 208 | struct nft_hash *priv = nft_set_priv(set); |
Patrick McHardy | fe2811e | 2015-03-25 13:07:50 +0000 | [diff] [blame] | 209 | struct nft_hash_elem *he; |
Herbert Xu | 9a77662 | 2015-02-04 07:33:25 +1100 | [diff] [blame] | 210 | struct rhashtable_iter hti; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 211 | struct nft_set_elem elem; |
Herbert Xu | 9a77662 | 2015-02-04 07:33:25 +1100 | [diff] [blame] | 212 | int err; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 213 | |
Bob Copeland | 8f6fd83 | 2016-03-02 10:09:19 -0500 | [diff] [blame] | 214 | err = rhashtable_walk_init(&priv->ht, &hti, GFP_KERNEL); |
Herbert Xu | 9a77662 | 2015-02-04 07:33:25 +1100 | [diff] [blame] | 215 | iter->err = err; |
| 216 | if (err) |
| 217 | return; |
Thomas Graf | 88d6ed1 | 2015-01-02 23:00:16 +0100 | [diff] [blame] | 218 | |
Herbert Xu | 9a77662 | 2015-02-04 07:33:25 +1100 | [diff] [blame] | 219 | err = rhashtable_walk_start(&hti); |
| 220 | if (err && err != -EAGAIN) { |
| 221 | iter->err = err; |
| 222 | goto out; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 223 | } |
Herbert Xu | 9a77662 | 2015-02-04 07:33:25 +1100 | [diff] [blame] | 224 | |
| 225 | while ((he = rhashtable_walk_next(&hti))) { |
| 226 | if (IS_ERR(he)) { |
| 227 | err = PTR_ERR(he); |
| 228 | if (err != -EAGAIN) { |
| 229 | iter->err = err; |
| 230 | goto out; |
| 231 | } |
Herbert Xu | d8bdff5 | 2015-03-13 10:52:14 +1100 | [diff] [blame] | 232 | |
| 233 | continue; |
Herbert Xu | 9a77662 | 2015-02-04 07:33:25 +1100 | [diff] [blame] | 234 | } |
| 235 | |
| 236 | if (iter->count < iter->skip) |
| 237 | goto cont; |
Patrick McHardy | 9d09829 | 2015-03-26 12:39:40 +0000 | [diff] [blame] | 238 | if (nft_set_elem_expired(&he->ext)) |
| 239 | goto cont; |
Pablo Neira Ayuso | 8588ac0 | 2016-06-11 12:20:27 +0800 | [diff] [blame] | 240 | if (!nft_set_elem_active(&he->ext, iter->genmask)) |
Patrick McHardy | cc02e45 | 2015-03-25 14:08:50 +0000 | [diff] [blame] | 241 | goto cont; |
Herbert Xu | 9a77662 | 2015-02-04 07:33:25 +1100 | [diff] [blame] | 242 | |
Patrick McHardy | fe2811e | 2015-03-25 13:07:50 +0000 | [diff] [blame] | 243 | elem.priv = he; |
Herbert Xu | 9a77662 | 2015-02-04 07:33:25 +1100 | [diff] [blame] | 244 | |
| 245 | iter->err = iter->fn(ctx, set, iter, &elem); |
| 246 | if (iter->err < 0) |
| 247 | goto out; |
| 248 | |
| 249 | cont: |
| 250 | iter->count++; |
| 251 | } |
| 252 | |
| 253 | out: |
| 254 | rhashtable_walk_stop(&hti); |
| 255 | rhashtable_walk_exit(&hti); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 256 | } |
| 257 | |
Patrick McHardy | 9d09829 | 2015-03-26 12:39:40 +0000 | [diff] [blame] | 258 | static void nft_hash_gc(struct work_struct *work) |
| 259 | { |
Patrick McHardy | 3dd0673 | 2015-04-05 14:41:06 +0200 | [diff] [blame] | 260 | struct nft_set *set; |
Patrick McHardy | 9d09829 | 2015-03-26 12:39:40 +0000 | [diff] [blame] | 261 | struct nft_hash_elem *he; |
| 262 | struct nft_hash *priv; |
| 263 | struct nft_set_gc_batch *gcb = NULL; |
| 264 | struct rhashtable_iter hti; |
| 265 | int err; |
| 266 | |
| 267 | priv = container_of(work, struct nft_hash, gc_work.work); |
| 268 | set = nft_set_container_of(priv); |
| 269 | |
Bob Copeland | 8f6fd83 | 2016-03-02 10:09:19 -0500 | [diff] [blame] | 270 | err = rhashtable_walk_init(&priv->ht, &hti, GFP_KERNEL); |
Patrick McHardy | 9d09829 | 2015-03-26 12:39:40 +0000 | [diff] [blame] | 271 | if (err) |
| 272 | goto schedule; |
| 273 | |
| 274 | err = rhashtable_walk_start(&hti); |
| 275 | if (err && err != -EAGAIN) |
| 276 | goto out; |
| 277 | |
| 278 | while ((he = rhashtable_walk_next(&hti))) { |
| 279 | if (IS_ERR(he)) { |
| 280 | if (PTR_ERR(he) != -EAGAIN) |
| 281 | goto out; |
| 282 | continue; |
| 283 | } |
| 284 | |
| 285 | if (!nft_set_elem_expired(&he->ext)) |
| 286 | continue; |
| 287 | if (nft_set_elem_mark_busy(&he->ext)) |
| 288 | continue; |
| 289 | |
| 290 | gcb = nft_set_gc_batch_check(set, gcb, GFP_ATOMIC); |
| 291 | if (gcb == NULL) |
| 292 | goto out; |
| 293 | rhashtable_remove_fast(&priv->ht, &he->node, nft_hash_params); |
Patrick McHardy | 3dd0673 | 2015-04-05 14:41:06 +0200 | [diff] [blame] | 294 | atomic_dec(&set->nelems); |
Patrick McHardy | 9d09829 | 2015-03-26 12:39:40 +0000 | [diff] [blame] | 295 | nft_set_gc_batch_add(gcb, he); |
| 296 | } |
| 297 | out: |
| 298 | rhashtable_walk_stop(&hti); |
| 299 | rhashtable_walk_exit(&hti); |
| 300 | |
| 301 | nft_set_gc_batch_complete(gcb); |
| 302 | schedule: |
| 303 | queue_delayed_work(system_power_efficient_wq, &priv->gc_work, |
| 304 | nft_set_gc_interval(set)); |
| 305 | } |
| 306 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 307 | static unsigned int nft_hash_privsize(const struct nlattr * const nla[]) |
| 308 | { |
Patrick McHardy | 745f545 | 2015-03-25 13:07:46 +0000 | [diff] [blame] | 309 | return sizeof(struct nft_hash); |
Thomas Graf | cfe4a9d | 2014-08-02 11:47:46 +0200 | [diff] [blame] | 310 | } |
| 311 | |
Herbert Xu | fa37732 | 2015-03-20 21:57:02 +1100 | [diff] [blame] | 312 | static const struct rhashtable_params nft_hash_params = { |
Patrick McHardy | 45d8475 | 2015-03-25 13:07:47 +0000 | [diff] [blame] | 313 | .head_offset = offsetof(struct nft_hash_elem, node), |
Patrick McHardy | bfd6e32 | 2015-03-25 13:07:48 +0000 | [diff] [blame] | 314 | .hashfn = nft_hash_key, |
| 315 | .obj_hashfn = nft_hash_obj, |
| 316 | .obj_cmpfn = nft_hash_cmp, |
Patrick McHardy | 45d8475 | 2015-03-25 13:07:47 +0000 | [diff] [blame] | 317 | .automatic_shrinking = true, |
Herbert Xu | fa37732 | 2015-03-20 21:57:02 +1100 | [diff] [blame] | 318 | }; |
| 319 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 320 | static int nft_hash_init(const struct nft_set *set, |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 321 | const struct nft_set_desc *desc, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 322 | const struct nlattr * const tb[]) |
| 323 | { |
Patrick McHardy | 745f545 | 2015-03-25 13:07:46 +0000 | [diff] [blame] | 324 | struct nft_hash *priv = nft_set_priv(set); |
Herbert Xu | fa37732 | 2015-03-20 21:57:02 +1100 | [diff] [blame] | 325 | struct rhashtable_params params = nft_hash_params; |
Patrick McHardy | 9d09829 | 2015-03-26 12:39:40 +0000 | [diff] [blame] | 326 | int err; |
Herbert Xu | fa37732 | 2015-03-20 21:57:02 +1100 | [diff] [blame] | 327 | |
| 328 | params.nelem_hint = desc->size ?: NFT_HASH_ELEMENT_HINT; |
Patrick McHardy | 45d8475 | 2015-03-25 13:07:47 +0000 | [diff] [blame] | 329 | params.key_len = set->klen; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 330 | |
Patrick McHardy | 9d09829 | 2015-03-26 12:39:40 +0000 | [diff] [blame] | 331 | err = rhashtable_init(&priv->ht, ¶ms); |
| 332 | if (err < 0) |
| 333 | return err; |
| 334 | |
| 335 | INIT_DEFERRABLE_WORK(&priv->gc_work, nft_hash_gc); |
| 336 | if (set->flags & NFT_SET_TIMEOUT) |
| 337 | queue_delayed_work(system_power_efficient_wq, &priv->gc_work, |
| 338 | nft_set_gc_interval(set)); |
| 339 | return 0; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 340 | } |
| 341 | |
Patrick McHardy | 61edafb | 2015-03-25 14:08:47 +0000 | [diff] [blame] | 342 | static void nft_hash_elem_destroy(void *ptr, void *arg) |
Thomas Graf | 6b6f302 | 2015-03-24 14:18:20 +0100 | [diff] [blame] | 343 | { |
Liping Zhang | 61f9e29 | 2016-10-22 18:51:25 +0800 | [diff] [blame] | 344 | nft_set_elem_destroy((const struct nft_set *)arg, ptr, true); |
Thomas Graf | 6b6f302 | 2015-03-24 14:18:20 +0100 | [diff] [blame] | 345 | } |
| 346 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 347 | static void nft_hash_destroy(const struct nft_set *set) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 348 | { |
Patrick McHardy | 745f545 | 2015-03-25 13:07:46 +0000 | [diff] [blame] | 349 | struct nft_hash *priv = nft_set_priv(set); |
| 350 | |
Patrick McHardy | 9d09829 | 2015-03-26 12:39:40 +0000 | [diff] [blame] | 351 | cancel_delayed_work_sync(&priv->gc_work); |
Patrick McHardy | 61edafb | 2015-03-25 14:08:47 +0000 | [diff] [blame] | 352 | rhashtable_free_and_destroy(&priv->ht, nft_hash_elem_destroy, |
| 353 | (void *)set); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 354 | } |
| 355 | |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 356 | static bool nft_hash_estimate(const struct nft_set_desc *desc, u32 features, |
| 357 | struct nft_set_estimate *est) |
| 358 | { |
| 359 | unsigned int esize; |
| 360 | |
| 361 | esize = sizeof(struct nft_hash_elem); |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 362 | if (desc->size) { |
Patrick McHardy | 745f545 | 2015-03-25 13:07:46 +0000 | [diff] [blame] | 363 | est->size = sizeof(struct nft_hash) + |
Thomas Graf | cfe4a9d | 2014-08-02 11:47:46 +0200 | [diff] [blame] | 364 | roundup_pow_of_two(desc->size * 4 / 3) * |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 365 | sizeof(struct nft_hash_elem *) + |
| 366 | desc->size * esize; |
| 367 | } else { |
| 368 | /* Resizing happens when the load drops below 30% or goes |
| 369 | * above 75%. The average of 52.5% load (approximated by 50%) |
| 370 | * is used for the size estimation of the hash buckets, |
| 371 | * meaning we calculate two buckets per element. |
| 372 | */ |
| 373 | est->size = esize + 2 * sizeof(struct nft_hash_elem *); |
| 374 | } |
| 375 | |
| 376 | est->class = NFT_SET_CLASS_O_1; |
| 377 | |
| 378 | return true; |
| 379 | } |
| 380 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 381 | static struct nft_set_ops nft_hash_ops __read_mostly = { |
| 382 | .privsize = nft_hash_privsize, |
Patrick McHardy | fe2811e | 2015-03-25 13:07:50 +0000 | [diff] [blame] | 383 | .elemsize = offsetof(struct nft_hash_elem, ext), |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 384 | .estimate = nft_hash_estimate, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 385 | .init = nft_hash_init, |
| 386 | .destroy = nft_hash_destroy, |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 387 | .insert = nft_hash_insert, |
Patrick McHardy | cc02e45 | 2015-03-25 14:08:50 +0000 | [diff] [blame] | 388 | .activate = nft_hash_activate, |
| 389 | .deactivate = nft_hash_deactivate, |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 390 | .remove = nft_hash_remove, |
| 391 | .lookup = nft_hash_lookup, |
Patrick McHardy | 22fe54d | 2015-04-05 14:41:08 +0200 | [diff] [blame] | 392 | .update = nft_hash_update, |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 393 | .walk = nft_hash_walk, |
Patrick McHardy | 9d09829 | 2015-03-26 12:39:40 +0000 | [diff] [blame] | 394 | .features = NFT_SET_MAP | NFT_SET_TIMEOUT, |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 395 | .owner = THIS_MODULE, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 396 | }; |
| 397 | |
| 398 | static int __init nft_hash_module_init(void) |
| 399 | { |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 400 | return nft_register_set(&nft_hash_ops); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 401 | } |
| 402 | |
| 403 | static void __exit nft_hash_module_exit(void) |
| 404 | { |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 405 | nft_unregister_set(&nft_hash_ops); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 406 | } |
| 407 | |
| 408 | module_init(nft_hash_module_init); |
| 409 | module_exit(nft_hash_module_exit); |
| 410 | |
| 411 | MODULE_LICENSE("GPL"); |
| 412 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 413 | MODULE_ALIAS_NFT_SET(); |