Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net> |
| 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> |
| 15 | #include <linux/rbtree.h> |
| 16 | #include <linux/netlink.h> |
| 17 | #include <linux/netfilter.h> |
| 18 | #include <linux/netfilter/nf_tables.h> |
| 19 | #include <net/netfilter/nf_tables.h> |
| 20 | |
Pablo Neira Ayuso | 7632667 | 2014-05-28 15:27:18 +0200 | [diff] [blame] | 21 | static DEFINE_SPINLOCK(nft_rbtree_lock); |
| 22 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 23 | struct nft_rbtree { |
| 24 | struct rb_root root; |
| 25 | }; |
| 26 | |
| 27 | struct nft_rbtree_elem { |
| 28 | struct rb_node node; |
Patrick McHardy | fe2811e | 2015-03-25 13:07:50 +0000 | [diff] [blame] | 29 | struct nft_set_ext ext; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 30 | }; |
| 31 | |
Patrick McHardy | cc02e45 | 2015-03-25 14:08:50 +0000 | [diff] [blame] | 32 | |
Patrick McHardy | 8cd8937 | 2015-04-11 02:27:35 +0100 | [diff] [blame] | 33 | static bool nft_rbtree_lookup(const struct nft_set *set, const u32 *key, |
Patrick McHardy | b2832dd | 2015-03-25 14:08:48 +0000 | [diff] [blame] | 34 | const struct nft_set_ext **ext) |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 35 | { |
| 36 | const struct nft_rbtree *priv = nft_set_priv(set); |
| 37 | const struct nft_rbtree_elem *rbe, *interval = NULL; |
Patrick McHardy | 16c45ed | 2015-03-21 15:19:14 +0000 | [diff] [blame] | 38 | const struct rb_node *parent; |
Patrick McHardy | cc02e45 | 2015-03-25 14:08:50 +0000 | [diff] [blame] | 39 | u8 genmask = nft_genmask_cur(read_pnet(&set->pnet)); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 40 | int d; |
| 41 | |
Pablo Neira Ayuso | 7632667 | 2014-05-28 15:27:18 +0200 | [diff] [blame] | 42 | spin_lock_bh(&nft_rbtree_lock); |
Patrick McHardy | 16c45ed | 2015-03-21 15:19:14 +0000 | [diff] [blame] | 43 | parent = priv->root.rb_node; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 44 | while (parent != NULL) { |
| 45 | rbe = rb_entry(parent, struct nft_rbtree_elem, node); |
| 46 | |
Patrick McHardy | e562d86 | 2015-04-11 02:27:34 +0100 | [diff] [blame] | 47 | d = memcmp(nft_set_ext_key(&rbe->ext), key, set->klen); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 48 | if (d < 0) { |
| 49 | parent = parent->rb_left; |
| 50 | interval = rbe; |
| 51 | } else if (d > 0) |
| 52 | parent = parent->rb_right; |
| 53 | else { |
| 54 | found: |
Patrick McHardy | cc02e45 | 2015-03-25 14:08:50 +0000 | [diff] [blame] | 55 | if (!nft_set_elem_active(&rbe->ext, genmask)) { |
| 56 | parent = parent->rb_left; |
| 57 | continue; |
| 58 | } |
Patrick McHardy | fe2811e | 2015-03-25 13:07:50 +0000 | [diff] [blame] | 59 | if (nft_set_ext_exists(&rbe->ext, NFT_SET_EXT_FLAGS) && |
| 60 | *nft_set_ext_flags(&rbe->ext) & |
| 61 | NFT_SET_ELEM_INTERVAL_END) |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 62 | goto out; |
Pablo Neira Ayuso | 7632667 | 2014-05-28 15:27:18 +0200 | [diff] [blame] | 63 | spin_unlock_bh(&nft_rbtree_lock); |
Patrick McHardy | b2832dd | 2015-03-25 14:08:48 +0000 | [diff] [blame] | 64 | |
| 65 | *ext = &rbe->ext; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 66 | return true; |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | if (set->flags & NFT_SET_INTERVAL && interval != NULL) { |
| 71 | rbe = interval; |
| 72 | goto found; |
| 73 | } |
| 74 | out: |
Pablo Neira Ayuso | 7632667 | 2014-05-28 15:27:18 +0200 | [diff] [blame] | 75 | spin_unlock_bh(&nft_rbtree_lock); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 76 | return false; |
| 77 | } |
| 78 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 79 | static int __nft_rbtree_insert(const struct nft_set *set, |
| 80 | struct nft_rbtree_elem *new) |
| 81 | { |
| 82 | struct nft_rbtree *priv = nft_set_priv(set); |
| 83 | struct nft_rbtree_elem *rbe; |
| 84 | struct rb_node *parent, **p; |
Patrick McHardy | cc02e45 | 2015-03-25 14:08:50 +0000 | [diff] [blame] | 85 | u8 genmask = nft_genmask_next(read_pnet(&set->pnet)); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 86 | int d; |
| 87 | |
| 88 | parent = NULL; |
| 89 | p = &priv->root.rb_node; |
| 90 | while (*p != NULL) { |
| 91 | parent = *p; |
| 92 | rbe = rb_entry(parent, struct nft_rbtree_elem, node); |
Patrick McHardy | e562d86 | 2015-04-11 02:27:34 +0100 | [diff] [blame] | 93 | d = memcmp(nft_set_ext_key(&rbe->ext), |
| 94 | nft_set_ext_key(&new->ext), |
| 95 | set->klen); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 96 | if (d < 0) |
| 97 | p = &parent->rb_left; |
| 98 | else if (d > 0) |
| 99 | p = &parent->rb_right; |
Patrick McHardy | cc02e45 | 2015-03-25 14:08:50 +0000 | [diff] [blame] | 100 | else { |
| 101 | if (nft_set_elem_active(&rbe->ext, genmask)) |
| 102 | return -EEXIST; |
| 103 | p = &parent->rb_left; |
| 104 | } |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 105 | } |
| 106 | rb_link_node(&new->node, parent, p); |
| 107 | rb_insert_color(&new->node, &priv->root); |
| 108 | return 0; |
| 109 | } |
| 110 | |
| 111 | static int nft_rbtree_insert(const struct nft_set *set, |
| 112 | const struct nft_set_elem *elem) |
| 113 | { |
Patrick McHardy | fe2811e | 2015-03-25 13:07:50 +0000 | [diff] [blame] | 114 | struct nft_rbtree_elem *rbe = elem->priv; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 115 | int err; |
| 116 | |
Pablo Neira Ayuso | 7632667 | 2014-05-28 15:27:18 +0200 | [diff] [blame] | 117 | spin_lock_bh(&nft_rbtree_lock); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 118 | err = __nft_rbtree_insert(set, rbe); |
Pablo Neira Ayuso | 7632667 | 2014-05-28 15:27:18 +0200 | [diff] [blame] | 119 | spin_unlock_bh(&nft_rbtree_lock); |
Patrick McHardy | fe2811e | 2015-03-25 13:07:50 +0000 | [diff] [blame] | 120 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 121 | return err; |
| 122 | } |
| 123 | |
| 124 | static void nft_rbtree_remove(const struct nft_set *set, |
| 125 | const struct nft_set_elem *elem) |
| 126 | { |
| 127 | struct nft_rbtree *priv = nft_set_priv(set); |
Patrick McHardy | cc02e45 | 2015-03-25 14:08:50 +0000 | [diff] [blame] | 128 | struct nft_rbtree_elem *rbe = elem->priv; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 129 | |
Pablo Neira Ayuso | 7632667 | 2014-05-28 15:27:18 +0200 | [diff] [blame] | 130 | spin_lock_bh(&nft_rbtree_lock); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 131 | rb_erase(&rbe->node, &priv->root); |
Pablo Neira Ayuso | 7632667 | 2014-05-28 15:27:18 +0200 | [diff] [blame] | 132 | spin_unlock_bh(&nft_rbtree_lock); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 133 | } |
| 134 | |
Patrick McHardy | cc02e45 | 2015-03-25 14:08:50 +0000 | [diff] [blame] | 135 | static void nft_rbtree_activate(const struct nft_set *set, |
| 136 | const struct nft_set_elem *elem) |
| 137 | { |
| 138 | struct nft_rbtree_elem *rbe = elem->priv; |
| 139 | |
| 140 | nft_set_elem_change_active(set, &rbe->ext); |
| 141 | } |
| 142 | |
| 143 | static void *nft_rbtree_deactivate(const struct nft_set *set, |
| 144 | const struct nft_set_elem *elem) |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 145 | { |
| 146 | const struct nft_rbtree *priv = nft_set_priv(set); |
| 147 | const struct rb_node *parent = priv->root.rb_node; |
| 148 | struct nft_rbtree_elem *rbe; |
Patrick McHardy | cc02e45 | 2015-03-25 14:08:50 +0000 | [diff] [blame] | 149 | u8 genmask = nft_genmask_cur(read_pnet(&set->pnet)); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 150 | int d; |
| 151 | |
| 152 | while (parent != NULL) { |
| 153 | rbe = rb_entry(parent, struct nft_rbtree_elem, node); |
| 154 | |
Patrick McHardy | 7d74026 | 2015-04-11 02:27:39 +0100 | [diff] [blame] | 155 | d = memcmp(nft_set_ext_key(&rbe->ext), &elem->key.val, |
| 156 | set->klen); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 157 | if (d < 0) |
| 158 | parent = parent->rb_left; |
| 159 | else if (d > 0) |
| 160 | parent = parent->rb_right; |
| 161 | else { |
Patrick McHardy | cc02e45 | 2015-03-25 14:08:50 +0000 | [diff] [blame] | 162 | if (!nft_set_elem_active(&rbe->ext, genmask)) { |
| 163 | parent = parent->rb_left; |
| 164 | continue; |
| 165 | } |
| 166 | nft_set_elem_change_active(set, &rbe->ext); |
| 167 | return rbe; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 168 | } |
| 169 | } |
Patrick McHardy | cc02e45 | 2015-03-25 14:08:50 +0000 | [diff] [blame] | 170 | return NULL; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 171 | } |
| 172 | |
| 173 | static void nft_rbtree_walk(const struct nft_ctx *ctx, |
| 174 | const struct nft_set *set, |
| 175 | struct nft_set_iter *iter) |
| 176 | { |
| 177 | const struct nft_rbtree *priv = nft_set_priv(set); |
Patrick McHardy | fe2811e | 2015-03-25 13:07:50 +0000 | [diff] [blame] | 178 | struct nft_rbtree_elem *rbe; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 179 | struct nft_set_elem elem; |
| 180 | struct rb_node *node; |
Patrick McHardy | cc02e45 | 2015-03-25 14:08:50 +0000 | [diff] [blame] | 181 | u8 genmask = nft_genmask_cur(read_pnet(&set->pnet)); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 182 | |
Pablo Neira Ayuso | 7632667 | 2014-05-28 15:27:18 +0200 | [diff] [blame] | 183 | spin_lock_bh(&nft_rbtree_lock); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 184 | for (node = rb_first(&priv->root); node != NULL; node = rb_next(node)) { |
Patrick McHardy | cc02e45 | 2015-03-25 14:08:50 +0000 | [diff] [blame] | 185 | rbe = rb_entry(node, struct nft_rbtree_elem, node); |
| 186 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 187 | if (iter->count < iter->skip) |
| 188 | goto cont; |
Patrick McHardy | cc02e45 | 2015-03-25 14:08:50 +0000 | [diff] [blame] | 189 | if (!nft_set_elem_active(&rbe->ext, genmask)) |
| 190 | goto cont; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 191 | |
Patrick McHardy | fe2811e | 2015-03-25 13:07:50 +0000 | [diff] [blame] | 192 | elem.priv = rbe; |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 193 | |
| 194 | iter->err = iter->fn(ctx, set, iter, &elem); |
Pablo Neira Ayuso | 7632667 | 2014-05-28 15:27:18 +0200 | [diff] [blame] | 195 | if (iter->err < 0) { |
| 196 | spin_unlock_bh(&nft_rbtree_lock); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 197 | return; |
Pablo Neira Ayuso | 7632667 | 2014-05-28 15:27:18 +0200 | [diff] [blame] | 198 | } |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 199 | cont: |
| 200 | iter->count++; |
| 201 | } |
Pablo Neira Ayuso | 7632667 | 2014-05-28 15:27:18 +0200 | [diff] [blame] | 202 | spin_unlock_bh(&nft_rbtree_lock); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 203 | } |
| 204 | |
| 205 | static unsigned int nft_rbtree_privsize(const struct nlattr * const nla[]) |
| 206 | { |
| 207 | return sizeof(struct nft_rbtree); |
| 208 | } |
| 209 | |
| 210 | static int nft_rbtree_init(const struct nft_set *set, |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 211 | const struct nft_set_desc *desc, |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 212 | const struct nlattr * const nla[]) |
| 213 | { |
| 214 | struct nft_rbtree *priv = nft_set_priv(set); |
| 215 | |
| 216 | priv->root = RB_ROOT; |
| 217 | return 0; |
| 218 | } |
| 219 | |
| 220 | static void nft_rbtree_destroy(const struct nft_set *set) |
| 221 | { |
| 222 | struct nft_rbtree *priv = nft_set_priv(set); |
| 223 | struct nft_rbtree_elem *rbe; |
| 224 | struct rb_node *node; |
| 225 | |
| 226 | while ((node = priv->root.rb_node) != NULL) { |
| 227 | rb_erase(node, &priv->root); |
| 228 | rbe = rb_entry(node, struct nft_rbtree_elem, node); |
Patrick McHardy | 61edafb | 2015-03-25 14:08:47 +0000 | [diff] [blame] | 229 | nft_set_elem_destroy(set, rbe); |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 230 | } |
| 231 | } |
| 232 | |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 233 | static bool nft_rbtree_estimate(const struct nft_set_desc *desc, u32 features, |
| 234 | struct nft_set_estimate *est) |
| 235 | { |
| 236 | unsigned int nsize; |
| 237 | |
| 238 | nsize = sizeof(struct nft_rbtree_elem); |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 239 | if (desc->size) |
| 240 | est->size = sizeof(struct nft_rbtree) + desc->size * nsize; |
| 241 | else |
| 242 | est->size = nsize; |
| 243 | |
| 244 | est->class = NFT_SET_CLASS_O_LOG_N; |
| 245 | |
| 246 | return true; |
| 247 | } |
| 248 | |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 249 | static struct nft_set_ops nft_rbtree_ops __read_mostly = { |
| 250 | .privsize = nft_rbtree_privsize, |
Patrick McHardy | fe2811e | 2015-03-25 13:07:50 +0000 | [diff] [blame] | 251 | .elemsize = offsetof(struct nft_rbtree_elem, ext), |
Patrick McHardy | c50b960 | 2014-03-28 10:19:47 +0000 | [diff] [blame] | 252 | .estimate = nft_rbtree_estimate, |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 253 | .init = nft_rbtree_init, |
| 254 | .destroy = nft_rbtree_destroy, |
| 255 | .insert = nft_rbtree_insert, |
| 256 | .remove = nft_rbtree_remove, |
Patrick McHardy | cc02e45 | 2015-03-25 14:08:50 +0000 | [diff] [blame] | 257 | .deactivate = nft_rbtree_deactivate, |
| 258 | .activate = nft_rbtree_activate, |
Patrick McHardy | 20a6934 | 2013-10-11 12:06:22 +0200 | [diff] [blame] | 259 | .lookup = nft_rbtree_lookup, |
| 260 | .walk = nft_rbtree_walk, |
| 261 | .features = NFT_SET_INTERVAL | NFT_SET_MAP, |
| 262 | .owner = THIS_MODULE, |
| 263 | }; |
| 264 | |
| 265 | static int __init nft_rbtree_module_init(void) |
| 266 | { |
| 267 | return nft_register_set(&nft_rbtree_ops); |
| 268 | } |
| 269 | |
| 270 | static void __exit nft_rbtree_module_exit(void) |
| 271 | { |
| 272 | nft_unregister_set(&nft_rbtree_ops); |
| 273 | } |
| 274 | |
| 275 | module_init(nft_rbtree_module_init); |
| 276 | module_exit(nft_rbtree_module_exit); |
| 277 | |
| 278 | MODULE_LICENSE("GPL"); |
| 279 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); |
| 280 | MODULE_ALIAS_NFT_SET(); |