2 * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
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.
8 * Development of this code funded by Astaro AG (http://www.astaro.com/)
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>
21 static DEFINE_SPINLOCK(nft_rbtree_lock);
27 struct nft_rbtree_elem {
29 struct nft_set_ext ext;
33 static bool nft_rbtree_lookup(const struct nft_set *set,
34 const struct nft_data *key,
35 const struct nft_set_ext **ext)
37 const struct nft_rbtree *priv = nft_set_priv(set);
38 const struct nft_rbtree_elem *rbe, *interval = NULL;
39 const struct rb_node *parent;
40 u8 genmask = nft_genmask_cur(read_pnet(&set->pnet));
43 spin_lock_bh(&nft_rbtree_lock);
44 parent = priv->root.rb_node;
45 while (parent != NULL) {
46 rbe = rb_entry(parent, struct nft_rbtree_elem, node);
48 d = nft_data_cmp(nft_set_ext_key(&rbe->ext), key, set->klen);
50 parent = parent->rb_left;
53 parent = parent->rb_right;
56 if (!nft_set_elem_active(&rbe->ext, genmask)) {
57 parent = parent->rb_left;
60 if (nft_set_ext_exists(&rbe->ext, NFT_SET_EXT_FLAGS) &&
61 *nft_set_ext_flags(&rbe->ext) &
62 NFT_SET_ELEM_INTERVAL_END)
64 spin_unlock_bh(&nft_rbtree_lock);
71 if (set->flags & NFT_SET_INTERVAL && interval != NULL) {
76 spin_unlock_bh(&nft_rbtree_lock);
80 static int __nft_rbtree_insert(const struct nft_set *set,
81 struct nft_rbtree_elem *new)
83 struct nft_rbtree *priv = nft_set_priv(set);
84 struct nft_rbtree_elem *rbe;
85 struct rb_node *parent, **p;
86 u8 genmask = nft_genmask_next(read_pnet(&set->pnet));
90 p = &priv->root.rb_node;
93 rbe = rb_entry(parent, struct nft_rbtree_elem, node);
94 d = nft_data_cmp(nft_set_ext_key(&rbe->ext),
95 nft_set_ext_key(&new->ext),
100 p = &parent->rb_right;
102 if (nft_set_elem_active(&rbe->ext, genmask))
104 p = &parent->rb_left;
107 rb_link_node(&new->node, parent, p);
108 rb_insert_color(&new->node, &priv->root);
112 static int nft_rbtree_insert(const struct nft_set *set,
113 const struct nft_set_elem *elem)
115 struct nft_rbtree_elem *rbe = elem->priv;
118 spin_lock_bh(&nft_rbtree_lock);
119 err = __nft_rbtree_insert(set, rbe);
120 spin_unlock_bh(&nft_rbtree_lock);
125 static void nft_rbtree_remove(const struct nft_set *set,
126 const struct nft_set_elem *elem)
128 struct nft_rbtree *priv = nft_set_priv(set);
129 struct nft_rbtree_elem *rbe = elem->priv;
131 spin_lock_bh(&nft_rbtree_lock);
132 rb_erase(&rbe->node, &priv->root);
133 spin_unlock_bh(&nft_rbtree_lock);
136 static void nft_rbtree_activate(const struct nft_set *set,
137 const struct nft_set_elem *elem)
139 struct nft_rbtree_elem *rbe = elem->priv;
141 nft_set_elem_change_active(set, &rbe->ext);
144 static void *nft_rbtree_deactivate(const struct nft_set *set,
145 const struct nft_set_elem *elem)
147 const struct nft_rbtree *priv = nft_set_priv(set);
148 const struct rb_node *parent = priv->root.rb_node;
149 struct nft_rbtree_elem *rbe;
150 u8 genmask = nft_genmask_cur(read_pnet(&set->pnet));
153 while (parent != NULL) {
154 rbe = rb_entry(parent, struct nft_rbtree_elem, node);
156 d = nft_data_cmp(nft_set_ext_key(&rbe->ext), &elem->key,
159 parent = parent->rb_left;
161 parent = parent->rb_right;
163 if (!nft_set_elem_active(&rbe->ext, genmask)) {
164 parent = parent->rb_left;
167 nft_set_elem_change_active(set, &rbe->ext);
174 static void nft_rbtree_walk(const struct nft_ctx *ctx,
175 const struct nft_set *set,
176 struct nft_set_iter *iter)
178 const struct nft_rbtree *priv = nft_set_priv(set);
179 struct nft_rbtree_elem *rbe;
180 struct nft_set_elem elem;
181 struct rb_node *node;
182 u8 genmask = nft_genmask_cur(read_pnet(&set->pnet));
184 spin_lock_bh(&nft_rbtree_lock);
185 for (node = rb_first(&priv->root); node != NULL; node = rb_next(node)) {
186 rbe = rb_entry(node, struct nft_rbtree_elem, node);
188 if (iter->count < iter->skip)
190 if (!nft_set_elem_active(&rbe->ext, genmask))
195 iter->err = iter->fn(ctx, set, iter, &elem);
197 spin_unlock_bh(&nft_rbtree_lock);
203 spin_unlock_bh(&nft_rbtree_lock);
206 static unsigned int nft_rbtree_privsize(const struct nlattr * const nla[])
208 return sizeof(struct nft_rbtree);
211 static int nft_rbtree_init(const struct nft_set *set,
212 const struct nft_set_desc *desc,
213 const struct nlattr * const nla[])
215 struct nft_rbtree *priv = nft_set_priv(set);
217 priv->root = RB_ROOT;
221 static void nft_rbtree_destroy(const struct nft_set *set)
223 struct nft_rbtree *priv = nft_set_priv(set);
224 struct nft_rbtree_elem *rbe;
225 struct rb_node *node;
227 while ((node = priv->root.rb_node) != NULL) {
228 rb_erase(node, &priv->root);
229 rbe = rb_entry(node, struct nft_rbtree_elem, node);
230 nft_set_elem_destroy(set, rbe);
234 static bool nft_rbtree_estimate(const struct nft_set_desc *desc, u32 features,
235 struct nft_set_estimate *est)
239 nsize = sizeof(struct nft_rbtree_elem);
241 est->size = sizeof(struct nft_rbtree) + desc->size * nsize;
245 est->class = NFT_SET_CLASS_O_LOG_N;
250 static struct nft_set_ops nft_rbtree_ops __read_mostly = {
251 .privsize = nft_rbtree_privsize,
252 .elemsize = offsetof(struct nft_rbtree_elem, ext),
253 .estimate = nft_rbtree_estimate,
254 .init = nft_rbtree_init,
255 .destroy = nft_rbtree_destroy,
256 .insert = nft_rbtree_insert,
257 .remove = nft_rbtree_remove,
258 .deactivate = nft_rbtree_deactivate,
259 .activate = nft_rbtree_activate,
260 .lookup = nft_rbtree_lookup,
261 .walk = nft_rbtree_walk,
262 .features = NFT_SET_INTERVAL | NFT_SET_MAP,
263 .owner = THIS_MODULE,
266 static int __init nft_rbtree_module_init(void)
268 return nft_register_set(&nft_rbtree_ops);
271 static void __exit nft_rbtree_module_exit(void)
273 nft_unregister_set(&nft_rbtree_ops);
276 module_init(nft_rbtree_module_init);
277 module_exit(nft_rbtree_module_exit);
279 MODULE_LICENSE("GPL");
280 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
281 MODULE_ALIAS_NFT_SET();