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31#include <linux/types.h>
32#include <linux/rcupdate.h>
33#include <linux/list.h>
34#include <linux/slab.h>
35#include <linux/spinlock.h>
36#include <linux/in.h>
37#include <linux/in6.h>
38#include <linux/ip.h>
39#include <linux/ipv6.h>
40#include <net/ip.h>
41#include <net/ipv6.h>
42
43#include "netnode.h"
44#include "objsec.h"
45
46#define SEL_NETNODE_HASH_SIZE 256
47#define SEL_NETNODE_HASH_BKT_LIMIT 16
48
49struct sel_netnode_bkt {
50 unsigned int size;
51 struct list_head list;
52};
53
54struct sel_netnode {
55 struct netnode_security_struct nsec;
56
57 struct list_head list;
58 struct rcu_head rcu;
59};
60
61
62
63
64
65
66
67static LIST_HEAD(sel_netnode_list);
68static DEFINE_SPINLOCK(sel_netnode_lock);
69static struct sel_netnode_bkt sel_netnode_hash[SEL_NETNODE_HASH_SIZE];
70
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79
80static unsigned int sel_netnode_hashfn_ipv4(__be32 addr)
81{
82
83
84 return (addr & (SEL_NETNODE_HASH_SIZE - 1));
85}
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95
96static unsigned int sel_netnode_hashfn_ipv6(const struct in6_addr *addr)
97{
98
99
100
101 return (addr->s6_addr32[3] & (SEL_NETNODE_HASH_SIZE - 1));
102}
103
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111
112
113
114static struct sel_netnode *sel_netnode_find(const void *addr, u16 family)
115{
116 unsigned int idx;
117 struct sel_netnode *node;
118
119 switch (family) {
120 case PF_INET:
121 idx = sel_netnode_hashfn_ipv4(*(__be32 *)addr);
122 break;
123 case PF_INET6:
124 idx = sel_netnode_hashfn_ipv6(addr);
125 break;
126 default:
127 BUG();
128 return NULL;
129 }
130
131 list_for_each_entry_rcu(node, &sel_netnode_hash[idx].list, list)
132 if (node->nsec.family == family)
133 switch (family) {
134 case PF_INET:
135 if (node->nsec.addr.ipv4 == *(__be32 *)addr)
136 return node;
137 break;
138 case PF_INET6:
139 if (ipv6_addr_equal(&node->nsec.addr.ipv6,
140 addr))
141 return node;
142 break;
143 }
144
145 return NULL;
146}
147
148
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150
151
152
153
154
155
156static void sel_netnode_insert(struct sel_netnode *node)
157{
158 unsigned int idx;
159
160 switch (node->nsec.family) {
161 case PF_INET:
162 idx = sel_netnode_hashfn_ipv4(node->nsec.addr.ipv4);
163 break;
164 case PF_INET6:
165 idx = sel_netnode_hashfn_ipv6(&node->nsec.addr.ipv6);
166 break;
167 default:
168 BUG();
169 return;
170 }
171
172
173
174 list_add_rcu(&node->list, &sel_netnode_hash[idx].list);
175 if (sel_netnode_hash[idx].size == SEL_NETNODE_HASH_BKT_LIMIT) {
176 struct sel_netnode *tail;
177 tail = list_entry(
178 rcu_dereference_protected(sel_netnode_hash[idx].list.prev,
179 lockdep_is_held(&sel_netnode_lock)),
180 struct sel_netnode, list);
181 list_del_rcu(&tail->list);
182 kfree_rcu(tail, rcu);
183 } else
184 sel_netnode_hash[idx].size++;
185}
186
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197
198
199
200static int sel_netnode_sid_slow(void *addr, u16 family, u32 *sid)
201{
202 int ret = -ENOMEM;
203 struct sel_netnode *node;
204 struct sel_netnode *new = NULL;
205
206 spin_lock_bh(&sel_netnode_lock);
207 node = sel_netnode_find(addr, family);
208 if (node != NULL) {
209 *sid = node->nsec.sid;
210 spin_unlock_bh(&sel_netnode_lock);
211 return 0;
212 }
213 new = kzalloc(sizeof(*new), GFP_ATOMIC);
214 if (new == NULL)
215 goto out;
216 switch (family) {
217 case PF_INET:
218 ret = security_node_sid(PF_INET,
219 addr, sizeof(struct in_addr), sid);
220 new->nsec.addr.ipv4 = *(__be32 *)addr;
221 break;
222 case PF_INET6:
223 ret = security_node_sid(PF_INET6,
224 addr, sizeof(struct in6_addr), sid);
225 new->nsec.addr.ipv6 = *(struct in6_addr *)addr;
226 break;
227 default:
228 BUG();
229 ret = -EINVAL;
230 }
231 if (ret != 0)
232 goto out;
233
234 new->nsec.family = family;
235 new->nsec.sid = *sid;
236 sel_netnode_insert(new);
237
238out:
239 spin_unlock_bh(&sel_netnode_lock);
240 if (unlikely(ret)) {
241 printk(KERN_WARNING
242 "SELinux: failure in sel_netnode_sid_slow(),"
243 " unable to determine network node label\n");
244 kfree(new);
245 }
246 return ret;
247}
248
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261
262
263int sel_netnode_sid(void *addr, u16 family, u32 *sid)
264{
265 struct sel_netnode *node;
266
267 rcu_read_lock();
268 node = sel_netnode_find(addr, family);
269 if (node != NULL) {
270 *sid = node->nsec.sid;
271 rcu_read_unlock();
272 return 0;
273 }
274 rcu_read_unlock();
275
276 return sel_netnode_sid_slow(addr, family, sid);
277}
278
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283
284
285
286void sel_netnode_flush(void)
287{
288 unsigned int idx;
289 struct sel_netnode *node, *node_tmp;
290
291 spin_lock_bh(&sel_netnode_lock);
292 for (idx = 0; idx < SEL_NETNODE_HASH_SIZE; idx++) {
293 list_for_each_entry_safe(node, node_tmp,
294 &sel_netnode_hash[idx].list, list) {
295 list_del_rcu(&node->list);
296 kfree_rcu(node, rcu);
297 }
298 sel_netnode_hash[idx].size = 0;
299 }
300 spin_unlock_bh(&sel_netnode_lock);
301}
302
303static __init int sel_netnode_init(void)
304{
305 int iter;
306
307 if (!selinux_enabled)
308 return 0;
309
310 for (iter = 0; iter < SEL_NETNODE_HASH_SIZE; iter++) {
311 INIT_LIST_HEAD(&sel_netnode_hash[iter].list);
312 sel_netnode_hash[iter].size = 0;
313 }
314
315 return 0;
316}
317
318__initcall(sel_netnode_init);
319