This source file includes following definitions.
- sel_netnode_hashfn_ipv4
- sel_netnode_hashfn_ipv6
- sel_netnode_find
- sel_netnode_insert
- sel_netnode_sid_slow
- sel_netnode_sid
- sel_netnode_flush
- sel_netnode_init
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21 #include <linux/types.h>
22 #include <linux/rcupdate.h>
23 #include <linux/list.h>
24 #include <linux/slab.h>
25 #include <linux/spinlock.h>
26 #include <linux/in.h>
27 #include <linux/in6.h>
28 #include <linux/ip.h>
29 #include <linux/ipv6.h>
30 #include <net/ip.h>
31 #include <net/ipv6.h>
32
33 #include "netnode.h"
34 #include "objsec.h"
35
36 #define SEL_NETNODE_HASH_SIZE 256
37 #define SEL_NETNODE_HASH_BKT_LIMIT 16
38
39 struct sel_netnode_bkt {
40 unsigned int size;
41 struct list_head list;
42 };
43
44 struct sel_netnode {
45 struct netnode_security_struct nsec;
46
47 struct list_head list;
48 struct rcu_head rcu;
49 };
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56
57 static LIST_HEAD(sel_netnode_list);
58 static DEFINE_SPINLOCK(sel_netnode_lock);
59 static struct sel_netnode_bkt sel_netnode_hash[SEL_NETNODE_HASH_SIZE];
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70 static unsigned int sel_netnode_hashfn_ipv4(__be32 addr)
71 {
72
73
74 return (addr & (SEL_NETNODE_HASH_SIZE - 1));
75 }
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86 static unsigned int sel_netnode_hashfn_ipv6(const struct in6_addr *addr)
87 {
88
89
90
91 return (addr->s6_addr32[3] & (SEL_NETNODE_HASH_SIZE - 1));
92 }
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104 static struct sel_netnode *sel_netnode_find(const void *addr, u16 family)
105 {
106 unsigned int idx;
107 struct sel_netnode *node;
108
109 switch (family) {
110 case PF_INET:
111 idx = sel_netnode_hashfn_ipv4(*(__be32 *)addr);
112 break;
113 case PF_INET6:
114 idx = sel_netnode_hashfn_ipv6(addr);
115 break;
116 default:
117 BUG();
118 return NULL;
119 }
120
121 list_for_each_entry_rcu(node, &sel_netnode_hash[idx].list, list)
122 if (node->nsec.family == family)
123 switch (family) {
124 case PF_INET:
125 if (node->nsec.addr.ipv4 == *(__be32 *)addr)
126 return node;
127 break;
128 case PF_INET6:
129 if (ipv6_addr_equal(&node->nsec.addr.ipv6,
130 addr))
131 return node;
132 break;
133 }
134
135 return NULL;
136 }
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145
146 static void sel_netnode_insert(struct sel_netnode *node)
147 {
148 unsigned int idx;
149
150 switch (node->nsec.family) {
151 case PF_INET:
152 idx = sel_netnode_hashfn_ipv4(node->nsec.addr.ipv4);
153 break;
154 case PF_INET6:
155 idx = sel_netnode_hashfn_ipv6(&node->nsec.addr.ipv6);
156 break;
157 default:
158 BUG();
159 return;
160 }
161
162
163
164 list_add_rcu(&node->list, &sel_netnode_hash[idx].list);
165 if (sel_netnode_hash[idx].size == SEL_NETNODE_HASH_BKT_LIMIT) {
166 struct sel_netnode *tail;
167 tail = list_entry(
168 rcu_dereference_protected(sel_netnode_hash[idx].list.prev,
169 lockdep_is_held(&sel_netnode_lock)),
170 struct sel_netnode, list);
171 list_del_rcu(&tail->list);
172 kfree_rcu(tail, rcu);
173 } else
174 sel_netnode_hash[idx].size++;
175 }
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189
190 static int sel_netnode_sid_slow(void *addr, u16 family, u32 *sid)
191 {
192 int ret;
193 struct sel_netnode *node;
194 struct sel_netnode *new;
195
196 spin_lock_bh(&sel_netnode_lock);
197 node = sel_netnode_find(addr, family);
198 if (node != NULL) {
199 *sid = node->nsec.sid;
200 spin_unlock_bh(&sel_netnode_lock);
201 return 0;
202 }
203
204 new = kzalloc(sizeof(*new), GFP_ATOMIC);
205 switch (family) {
206 case PF_INET:
207 ret = security_node_sid(&selinux_state, PF_INET,
208 addr, sizeof(struct in_addr), sid);
209 if (new)
210 new->nsec.addr.ipv4 = *(__be32 *)addr;
211 break;
212 case PF_INET6:
213 ret = security_node_sid(&selinux_state, PF_INET6,
214 addr, sizeof(struct in6_addr), sid);
215 if (new)
216 new->nsec.addr.ipv6 = *(struct in6_addr *)addr;
217 break;
218 default:
219 BUG();
220 ret = -EINVAL;
221 }
222 if (ret == 0 && new) {
223 new->nsec.family = family;
224 new->nsec.sid = *sid;
225 sel_netnode_insert(new);
226 } else
227 kfree(new);
228
229 spin_unlock_bh(&sel_netnode_lock);
230 if (unlikely(ret))
231 pr_warn("SELinux: failure in %s(), unable to determine network node label\n",
232 __func__);
233 return ret;
234 }
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250 int sel_netnode_sid(void *addr, u16 family, u32 *sid)
251 {
252 struct sel_netnode *node;
253
254 rcu_read_lock();
255 node = sel_netnode_find(addr, family);
256 if (node != NULL) {
257 *sid = node->nsec.sid;
258 rcu_read_unlock();
259 return 0;
260 }
261 rcu_read_unlock();
262
263 return sel_netnode_sid_slow(addr, family, sid);
264 }
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272
273 void sel_netnode_flush(void)
274 {
275 unsigned int idx;
276 struct sel_netnode *node, *node_tmp;
277
278 spin_lock_bh(&sel_netnode_lock);
279 for (idx = 0; idx < SEL_NETNODE_HASH_SIZE; idx++) {
280 list_for_each_entry_safe(node, node_tmp,
281 &sel_netnode_hash[idx].list, list) {
282 list_del_rcu(&node->list);
283 kfree_rcu(node, rcu);
284 }
285 sel_netnode_hash[idx].size = 0;
286 }
287 spin_unlock_bh(&sel_netnode_lock);
288 }
289
290 static __init int sel_netnode_init(void)
291 {
292 int iter;
293
294 if (!selinux_enabled)
295 return 0;
296
297 for (iter = 0; iter < SEL_NETNODE_HASH_SIZE; iter++) {
298 INIT_LIST_HEAD(&sel_netnode_hash[iter].list);
299 sel_netnode_hash[iter].size = 0;
300 }
301
302 return 0;
303 }
304
305 __initcall(sel_netnode_init);