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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 | ||
cc02e457 | 32 | |
8cd8937a | 33 | static bool nft_rbtree_lookup(const struct nft_set *set, const u32 *key, |
b2832dd6 | 34 | const struct nft_set_ext **ext) |
20a69341 PM |
35 | { |
36 | const struct nft_rbtree *priv = nft_set_priv(set); | |
37 | const struct nft_rbtree_elem *rbe, *interval = NULL; | |
16c45eda | 38 | const struct rb_node *parent; |
cc02e457 | 39 | u8 genmask = nft_genmask_cur(read_pnet(&set->pnet)); |
20a69341 PM |
40 | int d; |
41 | ||
7632667d | 42 | spin_lock_bh(&nft_rbtree_lock); |
16c45eda | 43 | parent = priv->root.rb_node; |
20a69341 PM |
44 | while (parent != NULL) { |
45 | rbe = rb_entry(parent, struct nft_rbtree_elem, node); | |
46 | ||
e562d860 | 47 | d = memcmp(nft_set_ext_key(&rbe->ext), key, set->klen); |
20a69341 PM |
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: | |
cc02e457 PM |
55 | if (!nft_set_elem_active(&rbe->ext, genmask)) { |
56 | parent = parent->rb_left; | |
57 | continue; | |
58 | } | |
fe2811eb PM |
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) | |
20a69341 | 62 | goto out; |
7632667d | 63 | spin_unlock_bh(&nft_rbtree_lock); |
b2832dd6 PM |
64 | |
65 | *ext = &rbe->ext; | |
20a69341 PM |
66 | return true; |
67 | } | |
68 | } | |
69 | ||
70 | if (set->flags & NFT_SET_INTERVAL && interval != NULL) { | |
71 | rbe = interval; | |
72 | goto found; | |
73 | } | |
74 | out: | |
7632667d | 75 | spin_unlock_bh(&nft_rbtree_lock); |
20a69341 PM |
76 | return false; |
77 | } | |
78 | ||
20a69341 PM |
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; | |
cc02e457 | 85 | u8 genmask = nft_genmask_next(read_pnet(&set->pnet)); |
20a69341 PM |
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); | |
e562d860 PM |
93 | d = memcmp(nft_set_ext_key(&rbe->ext), |
94 | nft_set_ext_key(&new->ext), | |
95 | set->klen); | |
20a69341 PM |
96 | if (d < 0) |
97 | p = &parent->rb_left; | |
98 | else if (d > 0) | |
99 | p = &parent->rb_right; | |
cc02e457 PM |
100 | else { |
101 | if (nft_set_elem_active(&rbe->ext, genmask)) | |
102 | return -EEXIST; | |
103 | p = &parent->rb_left; | |
104 | } | |
20a69341 PM |
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 | { | |
fe2811eb | 114 | struct nft_rbtree_elem *rbe = elem->priv; |
20a69341 PM |
115 | int err; |
116 | ||
7632667d | 117 | spin_lock_bh(&nft_rbtree_lock); |
20a69341 | 118 | err = __nft_rbtree_insert(set, rbe); |
7632667d | 119 | spin_unlock_bh(&nft_rbtree_lock); |
fe2811eb | 120 | |
20a69341 PM |
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); | |
cc02e457 | 128 | struct nft_rbtree_elem *rbe = elem->priv; |
20a69341 | 129 | |
7632667d | 130 | spin_lock_bh(&nft_rbtree_lock); |
20a69341 | 131 | rb_erase(&rbe->node, &priv->root); |
7632667d | 132 | spin_unlock_bh(&nft_rbtree_lock); |
20a69341 PM |
133 | } |
134 | ||
cc02e457 PM |
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) | |
20a69341 PM |
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; | |
cc02e457 | 149 | u8 genmask = nft_genmask_cur(read_pnet(&set->pnet)); |
20a69341 PM |
150 | int d; |
151 | ||
152 | while (parent != NULL) { | |
153 | rbe = rb_entry(parent, struct nft_rbtree_elem, node); | |
154 | ||
7d740264 PM |
155 | d = memcmp(nft_set_ext_key(&rbe->ext), &elem->key.val, |
156 | set->klen); | |
20a69341 PM |
157 | if (d < 0) |
158 | parent = parent->rb_left; | |
159 | else if (d > 0) | |
160 | parent = parent->rb_right; | |
161 | else { | |
cc02e457 PM |
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; | |
20a69341 PM |
168 | } |
169 | } | |
cc02e457 | 170 | return NULL; |
20a69341 PM |
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); | |
fe2811eb | 178 | struct nft_rbtree_elem *rbe; |
20a69341 PM |
179 | struct nft_set_elem elem; |
180 | struct rb_node *node; | |
cc02e457 | 181 | u8 genmask = nft_genmask_cur(read_pnet(&set->pnet)); |
20a69341 | 182 | |
7632667d | 183 | spin_lock_bh(&nft_rbtree_lock); |
20a69341 | 184 | for (node = rb_first(&priv->root); node != NULL; node = rb_next(node)) { |
cc02e457 PM |
185 | rbe = rb_entry(node, struct nft_rbtree_elem, node); |
186 | ||
20a69341 PM |
187 | if (iter->count < iter->skip) |
188 | goto cont; | |
cc02e457 PM |
189 | if (!nft_set_elem_active(&rbe->ext, genmask)) |
190 | goto cont; | |
20a69341 | 191 | |
fe2811eb | 192 | elem.priv = rbe; |
20a69341 PM |
193 | |
194 | iter->err = iter->fn(ctx, set, iter, &elem); | |
7632667d PNA |
195 | if (iter->err < 0) { |
196 | spin_unlock_bh(&nft_rbtree_lock); | |
20a69341 | 197 | return; |
7632667d | 198 | } |
20a69341 PM |
199 | cont: |
200 | iter->count++; | |
201 | } | |
7632667d | 202 | spin_unlock_bh(&nft_rbtree_lock); |
20a69341 PM |
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, | |
c50b960c | 211 | const struct nft_set_desc *desc, |
20a69341 PM |
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); | |
61edafbb | 229 | nft_set_elem_destroy(set, rbe); |
20a69341 PM |
230 | } |
231 | } | |
232 | ||
c50b960c PM |
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); | |
c50b960c PM |
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 | ||
20a69341 PM |
249 | static struct nft_set_ops nft_rbtree_ops __read_mostly = { |
250 | .privsize = nft_rbtree_privsize, | |
fe2811eb | 251 | .elemsize = offsetof(struct nft_rbtree_elem, ext), |
c50b960c | 252 | .estimate = nft_rbtree_estimate, |
20a69341 PM |
253 | .init = nft_rbtree_init, |
254 | .destroy = nft_rbtree_destroy, | |
255 | .insert = nft_rbtree_insert, | |
256 | .remove = nft_rbtree_remove, | |
cc02e457 PM |
257 | .deactivate = nft_rbtree_deactivate, |
258 | .activate = nft_rbtree_activate, | |
20a69341 PM |
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(); |