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>
27 struct nft_rbtree_elem {
29 struct nft_set_ext ext;
32 static bool nft_rbtree_interval_end(const struct nft_rbtree_elem *rbe)
34 return nft_set_ext_exists(&rbe->ext, NFT_SET_EXT_FLAGS) &&
35 (*nft_set_ext_flags(&rbe->ext) & NFT_SET_ELEM_INTERVAL_END);
38 static bool nft_rbtree_equal(const struct nft_set *set, const void *this,
39 const struct nft_rbtree_elem *interval)
41 return memcmp(this, nft_set_ext_key(&interval->ext), set->klen) == 0;
44 static bool __nft_rbtree_lookup(const struct net *net, const struct nft_set *set,
45 const u32 *key, const struct nft_set_ext **ext,
48 struct nft_rbtree *priv = nft_set_priv(set);
49 const struct nft_rbtree_elem *rbe, *interval = NULL;
50 u8 genmask = nft_genmask_cur(net);
51 const struct rb_node *parent;
55 parent = rcu_dereference_raw(priv->root.rb_node);
56 while (parent != NULL) {
57 if (read_seqcount_retry(&priv->count, seq))
60 rbe = rb_entry(parent, struct nft_rbtree_elem, node);
62 this = nft_set_ext_key(&rbe->ext);
63 d = memcmp(this, key, set->klen);
65 parent = rcu_dereference_raw(parent->rb_left);
67 nft_rbtree_equal(set, this, interval) &&
68 nft_rbtree_interval_end(this) &&
69 !nft_rbtree_interval_end(interval))
73 parent = rcu_dereference_raw(parent->rb_right);
75 if (!nft_set_elem_active(&rbe->ext, genmask)) {
76 parent = rcu_dereference_raw(parent->rb_left);
79 if (nft_rbtree_interval_end(rbe))
87 if (set->flags & NFT_SET_INTERVAL && interval != NULL &&
88 nft_set_elem_active(&interval->ext, genmask) &&
89 !nft_rbtree_interval_end(interval)) {
90 *ext = &interval->ext;
97 static bool nft_rbtree_lookup(const struct net *net, const struct nft_set *set,
98 const u32 *key, const struct nft_set_ext **ext)
100 struct nft_rbtree *priv = nft_set_priv(set);
101 unsigned int seq = read_seqcount_begin(&priv->count);
104 ret = __nft_rbtree_lookup(net, set, key, ext, seq);
105 if (ret || !read_seqcount_retry(&priv->count, seq))
108 read_lock_bh(&priv->lock);
109 seq = read_seqcount_begin(&priv->count);
110 ret = __nft_rbtree_lookup(net, set, key, ext, seq);
111 read_unlock_bh(&priv->lock);
116 static bool __nft_rbtree_get(const struct net *net, const struct nft_set *set,
117 const u32 *key, struct nft_rbtree_elem **elem,
118 unsigned int seq, unsigned int flags, u8 genmask)
120 struct nft_rbtree_elem *rbe, *interval = NULL;
121 struct nft_rbtree *priv = nft_set_priv(set);
122 const struct rb_node *parent;
126 parent = rcu_dereference_raw(priv->root.rb_node);
127 while (parent != NULL) {
128 if (read_seqcount_retry(&priv->count, seq))
131 rbe = rb_entry(parent, struct nft_rbtree_elem, node);
133 this = nft_set_ext_key(&rbe->ext);
134 d = memcmp(this, key, set->klen);
136 parent = rcu_dereference_raw(parent->rb_left);
139 parent = rcu_dereference_raw(parent->rb_right);
141 if (!nft_set_elem_active(&rbe->ext, genmask))
142 parent = rcu_dereference_raw(parent->rb_left);
144 if (!nft_set_ext_exists(&rbe->ext, NFT_SET_EXT_FLAGS) ||
145 (*nft_set_ext_flags(&rbe->ext) & NFT_SET_ELEM_INTERVAL_END) ==
146 (flags & NFT_SET_ELEM_INTERVAL_END)) {
154 if (set->flags & NFT_SET_INTERVAL && interval != NULL &&
155 nft_set_elem_active(&interval->ext, genmask) &&
156 !nft_rbtree_interval_end(interval)) {
164 static void *nft_rbtree_get(const struct net *net, const struct nft_set *set,
165 const struct nft_set_elem *elem, unsigned int flags)
167 struct nft_rbtree *priv = nft_set_priv(set);
168 unsigned int seq = read_seqcount_begin(&priv->count);
169 struct nft_rbtree_elem *rbe = ERR_PTR(-ENOENT);
170 const u32 *key = (const u32 *)&elem->key.val;
171 u8 genmask = nft_genmask_cur(net);
174 ret = __nft_rbtree_get(net, set, key, &rbe, seq, flags, genmask);
175 if (ret || !read_seqcount_retry(&priv->count, seq))
178 read_lock_bh(&priv->lock);
179 seq = read_seqcount_begin(&priv->count);
180 ret = __nft_rbtree_get(net, set, key, &rbe, seq, flags, genmask);
182 rbe = ERR_PTR(-ENOENT);
183 read_unlock_bh(&priv->lock);
188 static int __nft_rbtree_insert(const struct net *net, const struct nft_set *set,
189 struct nft_rbtree_elem *new,
190 struct nft_set_ext **ext)
192 struct nft_rbtree *priv = nft_set_priv(set);
193 u8 genmask = nft_genmask_next(net);
194 struct nft_rbtree_elem *rbe;
195 struct rb_node *parent, **p;
199 p = &priv->root.rb_node;
202 rbe = rb_entry(parent, struct nft_rbtree_elem, node);
203 d = memcmp(nft_set_ext_key(&rbe->ext),
204 nft_set_ext_key(&new->ext),
207 p = &parent->rb_left;
209 p = &parent->rb_right;
211 if (nft_rbtree_interval_end(rbe) &&
212 !nft_rbtree_interval_end(new)) {
213 p = &parent->rb_left;
214 } else if (!nft_rbtree_interval_end(rbe) &&
215 nft_rbtree_interval_end(new)) {
216 p = &parent->rb_right;
217 } else if (nft_set_elem_active(&rbe->ext, genmask)) {
221 p = &parent->rb_left;
225 rb_link_node_rcu(&new->node, parent, p);
226 rb_insert_color(&new->node, &priv->root);
230 static int nft_rbtree_insert(const struct net *net, const struct nft_set *set,
231 const struct nft_set_elem *elem,
232 struct nft_set_ext **ext)
234 struct nft_rbtree *priv = nft_set_priv(set);
235 struct nft_rbtree_elem *rbe = elem->priv;
238 write_lock_bh(&priv->lock);
239 write_seqcount_begin(&priv->count);
240 err = __nft_rbtree_insert(net, set, rbe, ext);
241 write_seqcount_end(&priv->count);
242 write_unlock_bh(&priv->lock);
247 static void nft_rbtree_remove(const struct net *net,
248 const struct nft_set *set,
249 const struct nft_set_elem *elem)
251 struct nft_rbtree *priv = nft_set_priv(set);
252 struct nft_rbtree_elem *rbe = elem->priv;
254 write_lock_bh(&priv->lock);
255 write_seqcount_begin(&priv->count);
256 rb_erase(&rbe->node, &priv->root);
257 write_seqcount_end(&priv->count);
258 write_unlock_bh(&priv->lock);
261 static void nft_rbtree_activate(const struct net *net,
262 const struct nft_set *set,
263 const struct nft_set_elem *elem)
265 struct nft_rbtree_elem *rbe = elem->priv;
267 nft_set_elem_change_active(net, set, &rbe->ext);
270 static bool nft_rbtree_flush(const struct net *net,
271 const struct nft_set *set, void *priv)
273 struct nft_rbtree_elem *rbe = priv;
275 nft_set_elem_change_active(net, set, &rbe->ext);
279 static void *nft_rbtree_deactivate(const struct net *net,
280 const struct nft_set *set,
281 const struct nft_set_elem *elem)
283 const struct nft_rbtree *priv = nft_set_priv(set);
284 const struct rb_node *parent = priv->root.rb_node;
285 struct nft_rbtree_elem *rbe, *this = elem->priv;
286 u8 genmask = nft_genmask_next(net);
289 while (parent != NULL) {
290 rbe = rb_entry(parent, struct nft_rbtree_elem, node);
292 d = memcmp(nft_set_ext_key(&rbe->ext), &elem->key.val,
295 parent = parent->rb_left;
297 parent = parent->rb_right;
299 if (!nft_set_elem_active(&rbe->ext, genmask)) {
300 parent = parent->rb_left;
303 if (nft_rbtree_interval_end(rbe) &&
304 !nft_rbtree_interval_end(this)) {
305 parent = parent->rb_left;
307 } else if (!nft_rbtree_interval_end(rbe) &&
308 nft_rbtree_interval_end(this)) {
309 parent = parent->rb_right;
312 nft_rbtree_flush(net, set, rbe);
319 static void nft_rbtree_walk(const struct nft_ctx *ctx,
321 struct nft_set_iter *iter)
323 struct nft_rbtree *priv = nft_set_priv(set);
324 struct nft_rbtree_elem *rbe;
325 struct nft_set_elem elem;
326 struct rb_node *node;
328 read_lock_bh(&priv->lock);
329 for (node = rb_first(&priv->root); node != NULL; node = rb_next(node)) {
330 rbe = rb_entry(node, struct nft_rbtree_elem, node);
332 if (iter->count < iter->skip)
334 if (!nft_set_elem_active(&rbe->ext, iter->genmask))
339 iter->err = iter->fn(ctx, set, iter, &elem);
341 read_unlock_bh(&priv->lock);
347 read_unlock_bh(&priv->lock);
350 static unsigned int nft_rbtree_privsize(const struct nlattr * const nla[],
351 const struct nft_set_desc *desc)
353 return sizeof(struct nft_rbtree);
356 static int nft_rbtree_init(const struct nft_set *set,
357 const struct nft_set_desc *desc,
358 const struct nlattr * const nla[])
360 struct nft_rbtree *priv = nft_set_priv(set);
362 rwlock_init(&priv->lock);
363 seqcount_init(&priv->count);
364 priv->root = RB_ROOT;
368 static void nft_rbtree_destroy(const struct nft_set *set)
370 struct nft_rbtree *priv = nft_set_priv(set);
371 struct nft_rbtree_elem *rbe;
372 struct rb_node *node;
374 while ((node = priv->root.rb_node) != NULL) {
375 rb_erase(node, &priv->root);
376 rbe = rb_entry(node, struct nft_rbtree_elem, node);
377 nft_set_elem_destroy(set, rbe, true);
381 static bool nft_rbtree_estimate(const struct nft_set_desc *desc, u32 features,
382 struct nft_set_estimate *est)
385 est->size = sizeof(struct nft_rbtree) +
386 desc->size * sizeof(struct nft_rbtree_elem);
390 est->lookup = NFT_SET_CLASS_O_LOG_N;
391 est->space = NFT_SET_CLASS_O_N;
396 static struct nft_set_type nft_rbtree_type;
397 static struct nft_set_ops nft_rbtree_ops __read_mostly = {
398 .type = &nft_rbtree_type,
399 .privsize = nft_rbtree_privsize,
400 .elemsize = offsetof(struct nft_rbtree_elem, ext),
401 .estimate = nft_rbtree_estimate,
402 .init = nft_rbtree_init,
403 .destroy = nft_rbtree_destroy,
404 .insert = nft_rbtree_insert,
405 .remove = nft_rbtree_remove,
406 .deactivate = nft_rbtree_deactivate,
407 .flush = nft_rbtree_flush,
408 .activate = nft_rbtree_activate,
409 .lookup = nft_rbtree_lookup,
410 .walk = nft_rbtree_walk,
411 .get = nft_rbtree_get,
412 .features = NFT_SET_INTERVAL | NFT_SET_MAP | NFT_SET_OBJECT,
415 static struct nft_set_type nft_rbtree_type __read_mostly = {
416 .ops = &nft_rbtree_ops,
417 .owner = THIS_MODULE,
420 static int __init nft_rbtree_module_init(void)
422 return nft_register_set(&nft_rbtree_type);
425 static void __exit nft_rbtree_module_exit(void)
427 nft_unregister_set(&nft_rbtree_type);
430 module_init(nft_rbtree_module_init);
431 module_exit(nft_rbtree_module_exit);
433 MODULE_LICENSE("GPL");
434 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
435 MODULE_ALIAS_NFT_SET();