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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 | ||
7632667d PNA |
21 | static DEFINE_SPINLOCK(nft_rbtree_lock); |
22 | ||
20a69341 PM |
23 | struct nft_rbtree { |
24 | struct rb_root root; | |
25 | }; | |
26 | ||
27 | struct nft_rbtree_elem { | |
28 | struct rb_node node; | |
fe2811eb | 29 | struct nft_set_ext ext; |
20a69341 PM |
30 | }; |
31 | ||
ef1d20e0 PNA |
32 | static bool nft_rbtree_interval_end(const struct nft_rbtree_elem *rbe) |
33 | { | |
34 | return nft_set_ext_exists(&rbe->ext, NFT_SET_EXT_FLAGS) && | |
35 | (*nft_set_ext_flags(&rbe->ext) & NFT_SET_ELEM_INTERVAL_END); | |
36 | } | |
cc02e457 | 37 | |
8cd8937a | 38 | static bool nft_rbtree_lookup(const struct nft_set *set, const u32 *key, |
b2832dd6 | 39 | const struct nft_set_ext **ext) |
20a69341 PM |
40 | { |
41 | const struct nft_rbtree *priv = nft_set_priv(set); | |
42 | const struct nft_rbtree_elem *rbe, *interval = NULL; | |
16c45eda | 43 | const struct rb_node *parent; |
cc02e457 | 44 | u8 genmask = nft_genmask_cur(read_pnet(&set->pnet)); |
20a69341 PM |
45 | int d; |
46 | ||
7632667d | 47 | spin_lock_bh(&nft_rbtree_lock); |
16c45eda | 48 | parent = priv->root.rb_node; |
20a69341 PM |
49 | while (parent != NULL) { |
50 | rbe = rb_entry(parent, struct nft_rbtree_elem, node); | |
51 | ||
e562d860 | 52 | d = memcmp(nft_set_ext_key(&rbe->ext), key, set->klen); |
20a69341 PM |
53 | if (d < 0) { |
54 | parent = parent->rb_left; | |
55 | interval = rbe; | |
56 | } else if (d > 0) | |
57 | parent = parent->rb_right; | |
58 | else { | |
59 | found: | |
cc02e457 PM |
60 | if (!nft_set_elem_active(&rbe->ext, genmask)) { |
61 | parent = parent->rb_left; | |
62 | continue; | |
63 | } | |
ef1d20e0 | 64 | if (nft_rbtree_interval_end(rbe)) |
20a69341 | 65 | goto out; |
7632667d | 66 | spin_unlock_bh(&nft_rbtree_lock); |
b2832dd6 PM |
67 | |
68 | *ext = &rbe->ext; | |
20a69341 PM |
69 | return true; |
70 | } | |
71 | } | |
72 | ||
73 | if (set->flags & NFT_SET_INTERVAL && interval != NULL) { | |
74 | rbe = interval; | |
75 | goto found; | |
76 | } | |
77 | out: | |
7632667d | 78 | spin_unlock_bh(&nft_rbtree_lock); |
20a69341 PM |
79 | return false; |
80 | } | |
81 | ||
20a69341 PM |
82 | static int __nft_rbtree_insert(const struct nft_set *set, |
83 | struct nft_rbtree_elem *new) | |
84 | { | |
85 | struct nft_rbtree *priv = nft_set_priv(set); | |
86 | struct nft_rbtree_elem *rbe; | |
87 | struct rb_node *parent, **p; | |
cc02e457 | 88 | u8 genmask = nft_genmask_next(read_pnet(&set->pnet)); |
20a69341 PM |
89 | int d; |
90 | ||
91 | parent = NULL; | |
92 | p = &priv->root.rb_node; | |
93 | while (*p != NULL) { | |
94 | parent = *p; | |
95 | rbe = rb_entry(parent, struct nft_rbtree_elem, node); | |
e562d860 PM |
96 | d = memcmp(nft_set_ext_key(&rbe->ext), |
97 | nft_set_ext_key(&new->ext), | |
98 | set->klen); | |
20a69341 PM |
99 | if (d < 0) |
100 | p = &parent->rb_left; | |
101 | else if (d > 0) | |
102 | p = &parent->rb_right; | |
cc02e457 PM |
103 | else { |
104 | if (nft_set_elem_active(&rbe->ext, genmask)) | |
105 | return -EEXIST; | |
106 | p = &parent->rb_left; | |
107 | } | |
20a69341 PM |
108 | } |
109 | rb_link_node(&new->node, parent, p); | |
110 | rb_insert_color(&new->node, &priv->root); | |
111 | return 0; | |
112 | } | |
113 | ||
114 | static int nft_rbtree_insert(const struct nft_set *set, | |
115 | const struct nft_set_elem *elem) | |
116 | { | |
fe2811eb | 117 | struct nft_rbtree_elem *rbe = elem->priv; |
20a69341 PM |
118 | int err; |
119 | ||
7632667d | 120 | spin_lock_bh(&nft_rbtree_lock); |
20a69341 | 121 | err = __nft_rbtree_insert(set, rbe); |
7632667d | 122 | spin_unlock_bh(&nft_rbtree_lock); |
fe2811eb | 123 | |
20a69341 PM |
124 | return err; |
125 | } | |
126 | ||
127 | static void nft_rbtree_remove(const struct nft_set *set, | |
128 | const struct nft_set_elem *elem) | |
129 | { | |
130 | struct nft_rbtree *priv = nft_set_priv(set); | |
cc02e457 | 131 | struct nft_rbtree_elem *rbe = elem->priv; |
20a69341 | 132 | |
7632667d | 133 | spin_lock_bh(&nft_rbtree_lock); |
20a69341 | 134 | rb_erase(&rbe->node, &priv->root); |
7632667d | 135 | spin_unlock_bh(&nft_rbtree_lock); |
20a69341 PM |
136 | } |
137 | ||
cc02e457 PM |
138 | static void nft_rbtree_activate(const struct nft_set *set, |
139 | const struct nft_set_elem *elem) | |
140 | { | |
141 | struct nft_rbtree_elem *rbe = elem->priv; | |
142 | ||
143 | nft_set_elem_change_active(set, &rbe->ext); | |
144 | } | |
145 | ||
146 | static void *nft_rbtree_deactivate(const struct nft_set *set, | |
147 | const struct nft_set_elem *elem) | |
20a69341 PM |
148 | { |
149 | const struct nft_rbtree *priv = nft_set_priv(set); | |
150 | const struct rb_node *parent = priv->root.rb_node; | |
151 | struct nft_rbtree_elem *rbe; | |
cc02e457 | 152 | u8 genmask = nft_genmask_cur(read_pnet(&set->pnet)); |
20a69341 PM |
153 | int d; |
154 | ||
155 | while (parent != NULL) { | |
156 | rbe = rb_entry(parent, struct nft_rbtree_elem, node); | |
157 | ||
7d740264 PM |
158 | d = memcmp(nft_set_ext_key(&rbe->ext), &elem->key.val, |
159 | set->klen); | |
20a69341 PM |
160 | if (d < 0) |
161 | parent = parent->rb_left; | |
162 | else if (d > 0) | |
163 | parent = parent->rb_right; | |
164 | else { | |
cc02e457 PM |
165 | if (!nft_set_elem_active(&rbe->ext, genmask)) { |
166 | parent = parent->rb_left; | |
167 | continue; | |
168 | } | |
169 | nft_set_elem_change_active(set, &rbe->ext); | |
170 | return rbe; | |
20a69341 PM |
171 | } |
172 | } | |
cc02e457 | 173 | return NULL; |
20a69341 PM |
174 | } |
175 | ||
176 | static void nft_rbtree_walk(const struct nft_ctx *ctx, | |
177 | const struct nft_set *set, | |
178 | struct nft_set_iter *iter) | |
179 | { | |
180 | const struct nft_rbtree *priv = nft_set_priv(set); | |
fe2811eb | 181 | struct nft_rbtree_elem *rbe; |
20a69341 PM |
182 | struct nft_set_elem elem; |
183 | struct rb_node *node; | |
cc02e457 | 184 | u8 genmask = nft_genmask_cur(read_pnet(&set->pnet)); |
20a69341 | 185 | |
7632667d | 186 | spin_lock_bh(&nft_rbtree_lock); |
20a69341 | 187 | for (node = rb_first(&priv->root); node != NULL; node = rb_next(node)) { |
cc02e457 PM |
188 | rbe = rb_entry(node, struct nft_rbtree_elem, node); |
189 | ||
20a69341 PM |
190 | if (iter->count < iter->skip) |
191 | goto cont; | |
cc02e457 PM |
192 | if (!nft_set_elem_active(&rbe->ext, genmask)) |
193 | goto cont; | |
20a69341 | 194 | |
fe2811eb | 195 | elem.priv = rbe; |
20a69341 PM |
196 | |
197 | iter->err = iter->fn(ctx, set, iter, &elem); | |
7632667d PNA |
198 | if (iter->err < 0) { |
199 | spin_unlock_bh(&nft_rbtree_lock); | |
20a69341 | 200 | return; |
7632667d | 201 | } |
20a69341 PM |
202 | cont: |
203 | iter->count++; | |
204 | } | |
7632667d | 205 | spin_unlock_bh(&nft_rbtree_lock); |
20a69341 PM |
206 | } |
207 | ||
208 | static unsigned int nft_rbtree_privsize(const struct nlattr * const nla[]) | |
209 | { | |
210 | return sizeof(struct nft_rbtree); | |
211 | } | |
212 | ||
213 | static int nft_rbtree_init(const struct nft_set *set, | |
c50b960c | 214 | const struct nft_set_desc *desc, |
20a69341 PM |
215 | const struct nlattr * const nla[]) |
216 | { | |
217 | struct nft_rbtree *priv = nft_set_priv(set); | |
218 | ||
219 | priv->root = RB_ROOT; | |
220 | return 0; | |
221 | } | |
222 | ||
223 | static void nft_rbtree_destroy(const struct nft_set *set) | |
224 | { | |
225 | struct nft_rbtree *priv = nft_set_priv(set); | |
226 | struct nft_rbtree_elem *rbe; | |
227 | struct rb_node *node; | |
228 | ||
229 | while ((node = priv->root.rb_node) != NULL) { | |
230 | rb_erase(node, &priv->root); | |
231 | rbe = rb_entry(node, struct nft_rbtree_elem, node); | |
61edafbb | 232 | nft_set_elem_destroy(set, rbe); |
20a69341 PM |
233 | } |
234 | } | |
235 | ||
c50b960c PM |
236 | static bool nft_rbtree_estimate(const struct nft_set_desc *desc, u32 features, |
237 | struct nft_set_estimate *est) | |
238 | { | |
239 | unsigned int nsize; | |
240 | ||
241 | nsize = sizeof(struct nft_rbtree_elem); | |
c50b960c PM |
242 | if (desc->size) |
243 | est->size = sizeof(struct nft_rbtree) + desc->size * nsize; | |
244 | else | |
245 | est->size = nsize; | |
246 | ||
247 | est->class = NFT_SET_CLASS_O_LOG_N; | |
248 | ||
249 | return true; | |
250 | } | |
251 | ||
20a69341 PM |
252 | static struct nft_set_ops nft_rbtree_ops __read_mostly = { |
253 | .privsize = nft_rbtree_privsize, | |
fe2811eb | 254 | .elemsize = offsetof(struct nft_rbtree_elem, ext), |
c50b960c | 255 | .estimate = nft_rbtree_estimate, |
20a69341 PM |
256 | .init = nft_rbtree_init, |
257 | .destroy = nft_rbtree_destroy, | |
258 | .insert = nft_rbtree_insert, | |
259 | .remove = nft_rbtree_remove, | |
cc02e457 PM |
260 | .deactivate = nft_rbtree_deactivate, |
261 | .activate = nft_rbtree_activate, | |
20a69341 PM |
262 | .lookup = nft_rbtree_lookup, |
263 | .walk = nft_rbtree_walk, | |
264 | .features = NFT_SET_INTERVAL | NFT_SET_MAP, | |
265 | .owner = THIS_MODULE, | |
266 | }; | |
267 | ||
268 | static int __init nft_rbtree_module_init(void) | |
269 | { | |
270 | return nft_register_set(&nft_rbtree_ops); | |
271 | } | |
272 | ||
273 | static void __exit nft_rbtree_module_exit(void) | |
274 | { | |
275 | nft_unregister_set(&nft_rbtree_ops); | |
276 | } | |
277 | ||
278 | module_init(nft_rbtree_module_init); | |
279 | module_exit(nft_rbtree_module_exit); | |
280 | ||
281 | MODULE_LICENSE("GPL"); | |
282 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
283 | MODULE_ALIAS_NFT_SET(); |