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20a69341 PM |
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 | ||
21 | struct nft_rbtree { | |
03e5fd0e | 22 | rwlock_t lock; |
20a69341 PM |
23 | struct rb_root root; |
24 | }; | |
25 | ||
26 | struct nft_rbtree_elem { | |
27 | struct rb_node node; | |
fe2811eb | 28 | struct nft_set_ext ext; |
20a69341 PM |
29 | }; |
30 | ||
ef1d20e0 PNA |
31 | static bool nft_rbtree_interval_end(const struct nft_rbtree_elem *rbe) |
32 | { | |
33 | return nft_set_ext_exists(&rbe->ext, NFT_SET_EXT_FLAGS) && | |
34 | (*nft_set_ext_flags(&rbe->ext) & NFT_SET_ELEM_INTERVAL_END); | |
35 | } | |
cc02e457 | 36 | |
e701001e PNA |
37 | static bool nft_rbtree_equal(const struct nft_set *set, const void *this, |
38 | const struct nft_rbtree_elem *interval) | |
39 | { | |
40 | return memcmp(this, nft_set_ext_key(&interval->ext), set->klen) == 0; | |
41 | } | |
42 | ||
42a55769 PNA |
43 | static bool nft_rbtree_lookup(const struct net *net, const struct nft_set *set, |
44 | const u32 *key, const struct nft_set_ext **ext) | |
20a69341 | 45 | { |
03e5fd0e | 46 | struct nft_rbtree *priv = nft_set_priv(set); |
20a69341 | 47 | const struct nft_rbtree_elem *rbe, *interval = NULL; |
42a55769 | 48 | u8 genmask = nft_genmask_cur(net); |
16c45eda | 49 | const struct rb_node *parent; |
e701001e | 50 | const void *this; |
20a69341 PM |
51 | int d; |
52 | ||
03e5fd0e | 53 | read_lock_bh(&priv->lock); |
16c45eda | 54 | parent = priv->root.rb_node; |
20a69341 PM |
55 | while (parent != NULL) { |
56 | rbe = rb_entry(parent, struct nft_rbtree_elem, node); | |
57 | ||
e701001e PNA |
58 | this = nft_set_ext_key(&rbe->ext); |
59 | d = memcmp(this, key, set->klen); | |
20a69341 PM |
60 | if (d < 0) { |
61 | parent = parent->rb_left; | |
f9121355 PNA |
62 | if (interval && |
63 | nft_rbtree_equal(set, this, interval) && | |
64 | nft_rbtree_interval_end(this) && | |
65 | !nft_rbtree_interval_end(interval)) | |
e701001e | 66 | continue; |
20a69341 PM |
67 | interval = rbe; |
68 | } else if (d > 0) | |
69 | parent = parent->rb_right; | |
70 | else { | |
cc02e457 PM |
71 | if (!nft_set_elem_active(&rbe->ext, genmask)) { |
72 | parent = parent->rb_left; | |
73 | continue; | |
74 | } | |
ef1d20e0 | 75 | if (nft_rbtree_interval_end(rbe)) |
20a69341 | 76 | goto out; |
03e5fd0e | 77 | read_unlock_bh(&priv->lock); |
b2832dd6 PM |
78 | |
79 | *ext = &rbe->ext; | |
20a69341 PM |
80 | return true; |
81 | } | |
82 | } | |
83 | ||
c1eda3c6 PNA |
84 | if (set->flags & NFT_SET_INTERVAL && interval != NULL && |
85 | nft_set_elem_active(&interval->ext, genmask) && | |
86 | !nft_rbtree_interval_end(interval)) { | |
03e5fd0e | 87 | read_unlock_bh(&priv->lock); |
c1eda3c6 PNA |
88 | *ext = &interval->ext; |
89 | return true; | |
20a69341 PM |
90 | } |
91 | out: | |
03e5fd0e | 92 | read_unlock_bh(&priv->lock); |
20a69341 PM |
93 | return false; |
94 | } | |
95 | ||
42a55769 | 96 | static int __nft_rbtree_insert(const struct net *net, const struct nft_set *set, |
c016c7e4 PNA |
97 | struct nft_rbtree_elem *new, |
98 | struct nft_set_ext **ext) | |
20a69341 PM |
99 | { |
100 | struct nft_rbtree *priv = nft_set_priv(set); | |
42a55769 | 101 | u8 genmask = nft_genmask_next(net); |
20a69341 PM |
102 | struct nft_rbtree_elem *rbe; |
103 | struct rb_node *parent, **p; | |
104 | int d; | |
105 | ||
106 | parent = NULL; | |
107 | p = &priv->root.rb_node; | |
108 | while (*p != NULL) { | |
109 | parent = *p; | |
110 | rbe = rb_entry(parent, struct nft_rbtree_elem, node); | |
e562d860 PM |
111 | d = memcmp(nft_set_ext_key(&rbe->ext), |
112 | nft_set_ext_key(&new->ext), | |
113 | set->klen); | |
20a69341 PM |
114 | if (d < 0) |
115 | p = &parent->rb_left; | |
116 | else if (d > 0) | |
117 | p = &parent->rb_right; | |
cc02e457 | 118 | else { |
d2df92e9 PNA |
119 | if (nft_rbtree_interval_end(rbe) && |
120 | !nft_rbtree_interval_end(new)) { | |
121 | p = &parent->rb_left; | |
122 | } else if (!nft_rbtree_interval_end(rbe) && | |
123 | nft_rbtree_interval_end(new)) { | |
124 | p = &parent->rb_right; | |
125 | } else if (nft_set_elem_active(&rbe->ext, genmask)) { | |
126 | *ext = &rbe->ext; | |
127 | return -EEXIST; | |
128 | } else { | |
129 | p = &parent->rb_left; | |
e701001e | 130 | } |
cc02e457 | 131 | } |
20a69341 PM |
132 | } |
133 | rb_link_node(&new->node, parent, p); | |
134 | rb_insert_color(&new->node, &priv->root); | |
135 | return 0; | |
136 | } | |
137 | ||
42a55769 | 138 | static int nft_rbtree_insert(const struct net *net, const struct nft_set *set, |
c016c7e4 PNA |
139 | const struct nft_set_elem *elem, |
140 | struct nft_set_ext **ext) | |
20a69341 | 141 | { |
03e5fd0e | 142 | struct nft_rbtree *priv = nft_set_priv(set); |
fe2811eb | 143 | struct nft_rbtree_elem *rbe = elem->priv; |
20a69341 PM |
144 | int err; |
145 | ||
03e5fd0e | 146 | write_lock_bh(&priv->lock); |
c016c7e4 | 147 | err = __nft_rbtree_insert(net, set, rbe, ext); |
03e5fd0e | 148 | write_unlock_bh(&priv->lock); |
fe2811eb | 149 | |
20a69341 PM |
150 | return err; |
151 | } | |
152 | ||
5cb82a38 PNA |
153 | static void nft_rbtree_remove(const struct net *net, |
154 | const struct nft_set *set, | |
20a69341 PM |
155 | const struct nft_set_elem *elem) |
156 | { | |
157 | struct nft_rbtree *priv = nft_set_priv(set); | |
cc02e457 | 158 | struct nft_rbtree_elem *rbe = elem->priv; |
20a69341 | 159 | |
03e5fd0e | 160 | write_lock_bh(&priv->lock); |
20a69341 | 161 | rb_erase(&rbe->node, &priv->root); |
03e5fd0e | 162 | write_unlock_bh(&priv->lock); |
20a69341 PM |
163 | } |
164 | ||
42a55769 PNA |
165 | static void nft_rbtree_activate(const struct net *net, |
166 | const struct nft_set *set, | |
cc02e457 PM |
167 | const struct nft_set_elem *elem) |
168 | { | |
169 | struct nft_rbtree_elem *rbe = elem->priv; | |
170 | ||
42a55769 | 171 | nft_set_elem_change_active(net, set, &rbe->ext); |
cc02e457 PM |
172 | } |
173 | ||
1ba1c414 PNA |
174 | static bool nft_rbtree_flush(const struct net *net, |
175 | const struct nft_set *set, void *priv) | |
37df5301 PNA |
176 | { |
177 | struct nft_rbtree_elem *rbe = priv; | |
178 | ||
179 | nft_set_elem_change_active(net, set, &rbe->ext); | |
180 | return true; | |
181 | } | |
182 | ||
42a55769 PNA |
183 | static void *nft_rbtree_deactivate(const struct net *net, |
184 | const struct nft_set *set, | |
cc02e457 | 185 | const struct nft_set_elem *elem) |
20a69341 PM |
186 | { |
187 | const struct nft_rbtree *priv = nft_set_priv(set); | |
188 | const struct rb_node *parent = priv->root.rb_node; | |
e701001e | 189 | struct nft_rbtree_elem *rbe, *this = elem->priv; |
42a55769 | 190 | u8 genmask = nft_genmask_next(net); |
20a69341 PM |
191 | int d; |
192 | ||
193 | while (parent != NULL) { | |
194 | rbe = rb_entry(parent, struct nft_rbtree_elem, node); | |
195 | ||
7d740264 PM |
196 | d = memcmp(nft_set_ext_key(&rbe->ext), &elem->key.val, |
197 | set->klen); | |
20a69341 PM |
198 | if (d < 0) |
199 | parent = parent->rb_left; | |
200 | else if (d > 0) | |
201 | parent = parent->rb_right; | |
202 | else { | |
cc02e457 PM |
203 | if (!nft_set_elem_active(&rbe->ext, genmask)) { |
204 | parent = parent->rb_left; | |
205 | continue; | |
206 | } | |
e701001e PNA |
207 | if (nft_rbtree_interval_end(rbe) && |
208 | !nft_rbtree_interval_end(this)) { | |
209 | parent = parent->rb_left; | |
210 | continue; | |
211 | } else if (!nft_rbtree_interval_end(rbe) && | |
212 | nft_rbtree_interval_end(this)) { | |
213 | parent = parent->rb_right; | |
214 | continue; | |
215 | } | |
1ba1c414 | 216 | nft_rbtree_flush(net, set, rbe); |
cc02e457 | 217 | return rbe; |
20a69341 PM |
218 | } |
219 | } | |
cc02e457 | 220 | return NULL; |
20a69341 PM |
221 | } |
222 | ||
223 | static void nft_rbtree_walk(const struct nft_ctx *ctx, | |
de70185d | 224 | struct nft_set *set, |
20a69341 PM |
225 | struct nft_set_iter *iter) |
226 | { | |
03e5fd0e | 227 | struct nft_rbtree *priv = nft_set_priv(set); |
fe2811eb | 228 | struct nft_rbtree_elem *rbe; |
20a69341 PM |
229 | struct nft_set_elem elem; |
230 | struct rb_node *node; | |
231 | ||
03e5fd0e | 232 | read_lock_bh(&priv->lock); |
20a69341 | 233 | for (node = rb_first(&priv->root); node != NULL; node = rb_next(node)) { |
cc02e457 PM |
234 | rbe = rb_entry(node, struct nft_rbtree_elem, node); |
235 | ||
20a69341 PM |
236 | if (iter->count < iter->skip) |
237 | goto cont; | |
8588ac09 | 238 | if (!nft_set_elem_active(&rbe->ext, iter->genmask)) |
cc02e457 | 239 | goto cont; |
20a69341 | 240 | |
fe2811eb | 241 | elem.priv = rbe; |
20a69341 PM |
242 | |
243 | iter->err = iter->fn(ctx, set, iter, &elem); | |
7632667d | 244 | if (iter->err < 0) { |
03e5fd0e | 245 | read_unlock_bh(&priv->lock); |
20a69341 | 246 | return; |
7632667d | 247 | } |
20a69341 PM |
248 | cont: |
249 | iter->count++; | |
250 | } | |
03e5fd0e | 251 | read_unlock_bh(&priv->lock); |
20a69341 PM |
252 | } |
253 | ||
347b408d PNA |
254 | static unsigned int nft_rbtree_privsize(const struct nlattr * const nla[], |
255 | const struct nft_set_desc *desc) | |
20a69341 PM |
256 | { |
257 | return sizeof(struct nft_rbtree); | |
258 | } | |
259 | ||
260 | static int nft_rbtree_init(const struct nft_set *set, | |
c50b960c | 261 | const struct nft_set_desc *desc, |
20a69341 PM |
262 | const struct nlattr * const nla[]) |
263 | { | |
264 | struct nft_rbtree *priv = nft_set_priv(set); | |
265 | ||
03e5fd0e | 266 | rwlock_init(&priv->lock); |
20a69341 PM |
267 | priv->root = RB_ROOT; |
268 | return 0; | |
269 | } | |
270 | ||
271 | static void nft_rbtree_destroy(const struct nft_set *set) | |
272 | { | |
273 | struct nft_rbtree *priv = nft_set_priv(set); | |
274 | struct nft_rbtree_elem *rbe; | |
275 | struct rb_node *node; | |
276 | ||
277 | while ((node = priv->root.rb_node) != NULL) { | |
278 | rb_erase(node, &priv->root); | |
279 | rbe = rb_entry(node, struct nft_rbtree_elem, node); | |
61f9e292 | 280 | nft_set_elem_destroy(set, rbe, true); |
20a69341 PM |
281 | } |
282 | } | |
283 | ||
c50b960c PM |
284 | static bool nft_rbtree_estimate(const struct nft_set_desc *desc, u32 features, |
285 | struct nft_set_estimate *est) | |
286 | { | |
c50b960c | 287 | if (desc->size) |
080ed636 PNA |
288 | est->size = sizeof(struct nft_rbtree) + |
289 | desc->size * sizeof(struct nft_rbtree_elem); | |
c50b960c | 290 | else |
080ed636 | 291 | est->size = ~0; |
c50b960c | 292 | |
55af753c | 293 | est->lookup = NFT_SET_CLASS_O_LOG_N; |
0b5a7874 | 294 | est->space = NFT_SET_CLASS_O_N; |
c50b960c PM |
295 | |
296 | return true; | |
297 | } | |
298 | ||
2b664957 | 299 | static struct nft_set_type nft_rbtree_type; |
20a69341 | 300 | static struct nft_set_ops nft_rbtree_ops __read_mostly = { |
2b664957 | 301 | .type = &nft_rbtree_type, |
20a69341 | 302 | .privsize = nft_rbtree_privsize, |
fe2811eb | 303 | .elemsize = offsetof(struct nft_rbtree_elem, ext), |
c50b960c | 304 | .estimate = nft_rbtree_estimate, |
20a69341 PM |
305 | .init = nft_rbtree_init, |
306 | .destroy = nft_rbtree_destroy, | |
307 | .insert = nft_rbtree_insert, | |
308 | .remove = nft_rbtree_remove, | |
cc02e457 | 309 | .deactivate = nft_rbtree_deactivate, |
1ba1c414 | 310 | .flush = nft_rbtree_flush, |
cc02e457 | 311 | .activate = nft_rbtree_activate, |
20a69341 PM |
312 | .lookup = nft_rbtree_lookup, |
313 | .walk = nft_rbtree_walk, | |
7286ff7f | 314 | .features = NFT_SET_INTERVAL | NFT_SET_MAP | NFT_SET_OBJECT, |
2b664957 PNA |
315 | }; |
316 | ||
317 | static struct nft_set_type nft_rbtree_type __read_mostly = { | |
318 | .ops = &nft_rbtree_ops, | |
20a69341 PM |
319 | .owner = THIS_MODULE, |
320 | }; | |
321 | ||
322 | static int __init nft_rbtree_module_init(void) | |
323 | { | |
2b664957 | 324 | return nft_register_set(&nft_rbtree_type); |
20a69341 PM |
325 | } |
326 | ||
327 | static void __exit nft_rbtree_module_exit(void) | |
328 | { | |
2b664957 | 329 | nft_unregister_set(&nft_rbtree_type); |
20a69341 PM |
330 | } |
331 | ||
332 | module_init(nft_rbtree_module_init); | |
333 | module_exit(nft_rbtree_module_exit); | |
334 | ||
335 | MODULE_LICENSE("GPL"); | |
336 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
337 | MODULE_ALIAS_NFT_SET(); |