Commit | Line | Data |
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d15c345f PM |
1 | /* |
2 | * NetLabel Domain Hash Table | |
3 | * | |
4 | * This file manages the domain hash table that NetLabel uses to determine | |
5 | * which network labeling protocol to use for a given domain. The NetLabel | |
6 | * system manages static and dynamic label mappings for network protocols such | |
7 | * as CIPSO and RIPSO. | |
8 | * | |
82c21bfa | 9 | * Author: Paul Moore <paul@paul-moore.com> |
d15c345f PM |
10 | * |
11 | */ | |
12 | ||
13 | /* | |
63c41688 | 14 | * (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008 |
d15c345f PM |
15 | * |
16 | * This program is free software; you can redistribute it and/or modify | |
17 | * it under the terms of the GNU General Public License as published by | |
18 | * the Free Software Foundation; either version 2 of the License, or | |
19 | * (at your option) any later version. | |
20 | * | |
21 | * This program is distributed in the hope that it will be useful, | |
22 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
23 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
24 | * the GNU General Public License for more details. | |
25 | * | |
26 | * You should have received a copy of the GNU General Public License | |
27 | * along with this program; if not, write to the Free Software | |
28 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
29 | * | |
30 | */ | |
31 | ||
32 | #include <linux/types.h> | |
82524746 | 33 | #include <linux/rculist.h> |
d15c345f PM |
34 | #include <linux/skbuff.h> |
35 | #include <linux/spinlock.h> | |
36 | #include <linux/string.h> | |
32f50cde | 37 | #include <linux/audit.h> |
5a0e3ad6 | 38 | #include <linux/slab.h> |
d15c345f PM |
39 | #include <net/netlabel.h> |
40 | #include <net/cipso_ipv4.h> | |
41 | #include <asm/bug.h> | |
42 | ||
43 | #include "netlabel_mgmt.h" | |
63c41688 | 44 | #include "netlabel_addrlist.h" |
d15c345f | 45 | #include "netlabel_domainhash.h" |
32f50cde | 46 | #include "netlabel_user.h" |
d15c345f PM |
47 | |
48 | struct netlbl_domhsh_tbl { | |
49 | struct list_head *tbl; | |
50 | u32 size; | |
51 | }; | |
52 | ||
53 | /* Domain hash table */ | |
b914f3a2 PM |
54 | /* updates should be so rare that having one spinlock for the entire hash table |
55 | * should be okay */ | |
8ce11e6a | 56 | static DEFINE_SPINLOCK(netlbl_domhsh_lock); |
b914f3a2 | 57 | #define netlbl_domhsh_rcu_deref(p) \ |
d8bf4ca9 | 58 | rcu_dereference_check(p, lockdep_is_held(&netlbl_domhsh_lock)) |
d15c345f | 59 | static struct netlbl_domhsh_tbl *netlbl_domhsh = NULL; |
d15c345f PM |
60 | static struct netlbl_dom_map *netlbl_domhsh_def = NULL; |
61 | ||
62 | /* | |
63 | * Domain Hash Table Helper Functions | |
64 | */ | |
65 | ||
66 | /** | |
67 | * netlbl_domhsh_free_entry - Frees a domain hash table entry | |
68 | * @entry: the entry's RCU field | |
69 | * | |
70 | * Description: | |
71 | * This function is designed to be used as a callback to the call_rcu() | |
72 | * function so that the memory allocated to a hash table entry can be released | |
73 | * safely. | |
74 | * | |
75 | */ | |
76 | static void netlbl_domhsh_free_entry(struct rcu_head *entry) | |
77 | { | |
78 | struct netlbl_dom_map *ptr; | |
63c41688 PM |
79 | struct netlbl_af4list *iter4; |
80 | struct netlbl_af4list *tmp4; | |
dfd56b8b | 81 | #if IS_ENABLED(CONFIG_IPV6) |
63c41688 PM |
82 | struct netlbl_af6list *iter6; |
83 | struct netlbl_af6list *tmp6; | |
84 | #endif /* IPv6 */ | |
d15c345f PM |
85 | |
86 | ptr = container_of(entry, struct netlbl_dom_map, rcu); | |
63c41688 PM |
87 | if (ptr->type == NETLBL_NLTYPE_ADDRSELECT) { |
88 | netlbl_af4list_foreach_safe(iter4, tmp4, | |
89 | &ptr->type_def.addrsel->list4) { | |
90 | netlbl_af4list_remove_entry(iter4); | |
91 | kfree(netlbl_domhsh_addr4_entry(iter4)); | |
92 | } | |
dfd56b8b | 93 | #if IS_ENABLED(CONFIG_IPV6) |
63c41688 PM |
94 | netlbl_af6list_foreach_safe(iter6, tmp6, |
95 | &ptr->type_def.addrsel->list6) { | |
96 | netlbl_af6list_remove_entry(iter6); | |
97 | kfree(netlbl_domhsh_addr6_entry(iter6)); | |
98 | } | |
99 | #endif /* IPv6 */ | |
100 | } | |
d15c345f PM |
101 | kfree(ptr->domain); |
102 | kfree(ptr); | |
103 | } | |
104 | ||
105 | /** | |
106 | * netlbl_domhsh_hash - Hashing function for the domain hash table | |
107 | * @domain: the domain name to hash | |
108 | * | |
109 | * Description: | |
110 | * This is the hashing function for the domain hash table, it returns the | |
25985edc | 111 | * correct bucket number for the domain. The caller is responsible for |
b914f3a2 PM |
112 | * ensuring that the hash table is protected with either a RCU read lock or the |
113 | * hash table lock. | |
d15c345f PM |
114 | * |
115 | */ | |
116 | static u32 netlbl_domhsh_hash(const char *key) | |
117 | { | |
118 | u32 iter; | |
119 | u32 val; | |
120 | u32 len; | |
121 | ||
122 | /* This is taken (with slight modification) from | |
123 | * security/selinux/ss/symtab.c:symhash() */ | |
124 | ||
125 | for (iter = 0, val = 0, len = strlen(key); iter < len; iter++) | |
126 | val = (val << 4 | (val >> (8 * sizeof(u32) - 4))) ^ key[iter]; | |
b914f3a2 | 127 | return val & (netlbl_domhsh_rcu_deref(netlbl_domhsh)->size - 1); |
d15c345f PM |
128 | } |
129 | ||
130 | /** | |
131 | * netlbl_domhsh_search - Search for a domain entry | |
132 | * @domain: the domain | |
d15c345f PM |
133 | * |
134 | * Description: | |
135 | * Searches the domain hash table and returns a pointer to the hash table | |
25985edc | 136 | * entry if found, otherwise NULL is returned. The caller is responsible for |
b914f3a2 PM |
137 | * ensuring that the hash table is protected with either a RCU read lock or the |
138 | * hash table lock. | |
d15c345f PM |
139 | * |
140 | */ | |
b64397e0 | 141 | static struct netlbl_dom_map *netlbl_domhsh_search(const char *domain) |
d15c345f PM |
142 | { |
143 | u32 bkt; | |
56196701 | 144 | struct list_head *bkt_list; |
d15c345f PM |
145 | struct netlbl_dom_map *iter; |
146 | ||
147 | if (domain != NULL) { | |
148 | bkt = netlbl_domhsh_hash(domain); | |
b914f3a2 | 149 | bkt_list = &netlbl_domhsh_rcu_deref(netlbl_domhsh)->tbl[bkt]; |
56196701 | 150 | list_for_each_entry_rcu(iter, bkt_list, list) |
d15c345f PM |
151 | if (iter->valid && strcmp(iter->domain, domain) == 0) |
152 | return iter; | |
153 | } | |
154 | ||
b64397e0 PM |
155 | return NULL; |
156 | } | |
157 | ||
158 | /** | |
159 | * netlbl_domhsh_search_def - Search for a domain entry | |
160 | * @domain: the domain | |
161 | * @def: return default if no match is found | |
162 | * | |
163 | * Description: | |
164 | * Searches the domain hash table and returns a pointer to the hash table | |
165 | * entry if an exact match is found, if an exact match is not present in the | |
166 | * hash table then the default entry is returned if valid otherwise NULL is | |
25985edc | 167 | * returned. The caller is responsible ensuring that the hash table is |
b914f3a2 | 168 | * protected with either a RCU read lock or the hash table lock. |
b64397e0 PM |
169 | * |
170 | */ | |
171 | static struct netlbl_dom_map *netlbl_domhsh_search_def(const char *domain) | |
172 | { | |
173 | struct netlbl_dom_map *entry; | |
174 | ||
175 | entry = netlbl_domhsh_search(domain); | |
176 | if (entry == NULL) { | |
b914f3a2 | 177 | entry = netlbl_domhsh_rcu_deref(netlbl_domhsh_def); |
4c3a0a25 PE |
178 | if (entry != NULL && !entry->valid) |
179 | entry = NULL; | |
d15c345f PM |
180 | } |
181 | ||
4c3a0a25 | 182 | return entry; |
d15c345f PM |
183 | } |
184 | ||
63c41688 PM |
185 | /** |
186 | * netlbl_domhsh_audit_add - Generate an audit entry for an add event | |
187 | * @entry: the entry being added | |
188 | * @addr4: the IPv4 address information | |
189 | * @addr6: the IPv6 address information | |
190 | * @result: the result code | |
191 | * @audit_info: NetLabel audit information | |
192 | * | |
193 | * Description: | |
194 | * Generate an audit record for adding a new NetLabel/LSM mapping entry with | |
25985edc | 195 | * the given information. Caller is responsible for holding the necessary |
63c41688 PM |
196 | * locks. |
197 | * | |
198 | */ | |
199 | static void netlbl_domhsh_audit_add(struct netlbl_dom_map *entry, | |
200 | struct netlbl_af4list *addr4, | |
201 | struct netlbl_af6list *addr6, | |
202 | int result, | |
203 | struct netlbl_audit *audit_info) | |
204 | { | |
205 | struct audit_buffer *audit_buf; | |
206 | struct cipso_v4_doi *cipsov4 = NULL; | |
207 | u32 type; | |
208 | ||
209 | audit_buf = netlbl_audit_start_common(AUDIT_MAC_MAP_ADD, audit_info); | |
210 | if (audit_buf != NULL) { | |
211 | audit_log_format(audit_buf, " nlbl_domain=%s", | |
212 | entry->domain ? entry->domain : "(default)"); | |
213 | if (addr4 != NULL) { | |
214 | struct netlbl_domaddr4_map *map4; | |
215 | map4 = netlbl_domhsh_addr4_entry(addr4); | |
216 | type = map4->type; | |
217 | cipsov4 = map4->type_def.cipsov4; | |
218 | netlbl_af4list_audit_addr(audit_buf, 0, NULL, | |
219 | addr4->addr, addr4->mask); | |
dfd56b8b | 220 | #if IS_ENABLED(CONFIG_IPV6) |
63c41688 PM |
221 | } else if (addr6 != NULL) { |
222 | struct netlbl_domaddr6_map *map6; | |
223 | map6 = netlbl_domhsh_addr6_entry(addr6); | |
224 | type = map6->type; | |
225 | netlbl_af6list_audit_addr(audit_buf, 0, NULL, | |
226 | &addr6->addr, &addr6->mask); | |
227 | #endif /* IPv6 */ | |
228 | } else { | |
229 | type = entry->type; | |
230 | cipsov4 = entry->type_def.cipsov4; | |
231 | } | |
232 | switch (type) { | |
233 | case NETLBL_NLTYPE_UNLABELED: | |
234 | audit_log_format(audit_buf, " nlbl_protocol=unlbl"); | |
235 | break; | |
236 | case NETLBL_NLTYPE_CIPSOV4: | |
237 | BUG_ON(cipsov4 == NULL); | |
238 | audit_log_format(audit_buf, | |
239 | " nlbl_protocol=cipsov4 cipso_doi=%u", | |
240 | cipsov4->doi); | |
241 | break; | |
242 | } | |
243 | audit_log_format(audit_buf, " res=%u", result == 0 ? 1 : 0); | |
244 | audit_log_end(audit_buf); | |
245 | } | |
246 | } | |
247 | ||
d15c345f PM |
248 | /* |
249 | * Domain Hash Table Functions | |
250 | */ | |
251 | ||
252 | /** | |
253 | * netlbl_domhsh_init - Init for the domain hash | |
254 | * @size: the number of bits to use for the hash buckets | |
255 | * | |
256 | * Description: | |
257 | * Initializes the domain hash table, should be called only by | |
258 | * netlbl_user_init() during initialization. Returns zero on success, non-zero | |
259 | * values on error. | |
260 | * | |
261 | */ | |
05705e4e | 262 | int __init netlbl_domhsh_init(u32 size) |
d15c345f PM |
263 | { |
264 | u32 iter; | |
265 | struct netlbl_domhsh_tbl *hsh_tbl; | |
266 | ||
267 | if (size == 0) | |
268 | return -EINVAL; | |
269 | ||
270 | hsh_tbl = kmalloc(sizeof(*hsh_tbl), GFP_KERNEL); | |
271 | if (hsh_tbl == NULL) | |
272 | return -ENOMEM; | |
273 | hsh_tbl->size = 1 << size; | |
274 | hsh_tbl->tbl = kcalloc(hsh_tbl->size, | |
275 | sizeof(struct list_head), | |
276 | GFP_KERNEL); | |
277 | if (hsh_tbl->tbl == NULL) { | |
278 | kfree(hsh_tbl); | |
279 | return -ENOMEM; | |
280 | } | |
281 | for (iter = 0; iter < hsh_tbl->size; iter++) | |
282 | INIT_LIST_HEAD(&hsh_tbl->tbl[iter]); | |
283 | ||
d15c345f | 284 | spin_lock(&netlbl_domhsh_lock); |
cf778b00 | 285 | rcu_assign_pointer(netlbl_domhsh, hsh_tbl); |
d15c345f | 286 | spin_unlock(&netlbl_domhsh_lock); |
d15c345f PM |
287 | |
288 | return 0; | |
289 | } | |
290 | ||
291 | /** | |
292 | * netlbl_domhsh_add - Adds a entry to the domain hash table | |
293 | * @entry: the entry to add | |
95d4e6be | 294 | * @audit_info: NetLabel audit information |
d15c345f PM |
295 | * |
296 | * Description: | |
297 | * Adds a new entry to the domain hash table and handles any updates to the | |
298 | * lower level protocol handler (i.e. CIPSO). Returns zero on success, | |
299 | * negative on failure. | |
300 | * | |
301 | */ | |
95d4e6be PM |
302 | int netlbl_domhsh_add(struct netlbl_dom_map *entry, |
303 | struct netlbl_audit *audit_info) | |
d15c345f | 304 | { |
63c41688 PM |
305 | int ret_val = 0; |
306 | struct netlbl_dom_map *entry_old; | |
307 | struct netlbl_af4list *iter4; | |
308 | struct netlbl_af4list *tmp4; | |
dfd56b8b | 309 | #if IS_ENABLED(CONFIG_IPV6) |
63c41688 PM |
310 | struct netlbl_af6list *iter6; |
311 | struct netlbl_af6list *tmp6; | |
312 | #endif /* IPv6 */ | |
d15c345f | 313 | |
b914f3a2 PM |
314 | /* XXX - we can remove this RCU read lock as the spinlock protects the |
315 | * entire function, but before we do we need to fixup the | |
316 | * netlbl_af[4,6]list RCU functions to do "the right thing" with | |
317 | * respect to rcu_dereference() when only a spinlock is held. */ | |
d15c345f | 318 | rcu_read_lock(); |
1c3fad93 | 319 | spin_lock(&netlbl_domhsh_lock); |
63c41688 PM |
320 | if (entry->domain != NULL) |
321 | entry_old = netlbl_domhsh_search(entry->domain); | |
322 | else | |
323 | entry_old = netlbl_domhsh_search_def(entry->domain); | |
324 | if (entry_old == NULL) { | |
325 | entry->valid = 1; | |
63c41688 PM |
326 | |
327 | if (entry->domain != NULL) { | |
328 | u32 bkt = netlbl_domhsh_hash(entry->domain); | |
d15c345f | 329 | list_add_tail_rcu(&entry->list, |
3482fd90 | 330 | &rcu_dereference(netlbl_domhsh)->tbl[bkt]); |
63c41688 PM |
331 | } else { |
332 | INIT_LIST_HEAD(&entry->list); | |
cf778b00 | 333 | rcu_assign_pointer(netlbl_domhsh_def, entry); |
de64688f | 334 | } |
d15c345f | 335 | |
63c41688 PM |
336 | if (entry->type == NETLBL_NLTYPE_ADDRSELECT) { |
337 | netlbl_af4list_foreach_rcu(iter4, | |
338 | &entry->type_def.addrsel->list4) | |
339 | netlbl_domhsh_audit_add(entry, iter4, NULL, | |
340 | ret_val, audit_info); | |
dfd56b8b | 341 | #if IS_ENABLED(CONFIG_IPV6) |
63c41688 PM |
342 | netlbl_af6list_foreach_rcu(iter6, |
343 | &entry->type_def.addrsel->list6) | |
344 | netlbl_domhsh_audit_add(entry, NULL, iter6, | |
345 | ret_val, audit_info); | |
346 | #endif /* IPv6 */ | |
347 | } else | |
348 | netlbl_domhsh_audit_add(entry, NULL, NULL, | |
349 | ret_val, audit_info); | |
350 | } else if (entry_old->type == NETLBL_NLTYPE_ADDRSELECT && | |
351 | entry->type == NETLBL_NLTYPE_ADDRSELECT) { | |
352 | struct list_head *old_list4; | |
353 | struct list_head *old_list6; | |
354 | ||
355 | old_list4 = &entry_old->type_def.addrsel->list4; | |
356 | old_list6 = &entry_old->type_def.addrsel->list6; | |
357 | ||
358 | /* we only allow the addition of address selectors if all of | |
359 | * the selectors do not exist in the existing domain map */ | |
360 | netlbl_af4list_foreach_rcu(iter4, | |
361 | &entry->type_def.addrsel->list4) | |
362 | if (netlbl_af4list_search_exact(iter4->addr, | |
363 | iter4->mask, | |
364 | old_list4)) { | |
365 | ret_val = -EEXIST; | |
366 | goto add_return; | |
367 | } | |
dfd56b8b | 368 | #if IS_ENABLED(CONFIG_IPV6) |
63c41688 PM |
369 | netlbl_af6list_foreach_rcu(iter6, |
370 | &entry->type_def.addrsel->list6) | |
371 | if (netlbl_af6list_search_exact(&iter6->addr, | |
372 | &iter6->mask, | |
373 | old_list6)) { | |
374 | ret_val = -EEXIST; | |
375 | goto add_return; | |
376 | } | |
377 | #endif /* IPv6 */ | |
378 | ||
379 | netlbl_af4list_foreach_safe(iter4, tmp4, | |
380 | &entry->type_def.addrsel->list4) { | |
381 | netlbl_af4list_remove_entry(iter4); | |
382 | iter4->valid = 1; | |
383 | ret_val = netlbl_af4list_add(iter4, old_list4); | |
384 | netlbl_domhsh_audit_add(entry_old, iter4, NULL, | |
385 | ret_val, audit_info); | |
386 | if (ret_val != 0) | |
387 | goto add_return; | |
388 | } | |
dfd56b8b | 389 | #if IS_ENABLED(CONFIG_IPV6) |
63c41688 PM |
390 | netlbl_af6list_foreach_safe(iter6, tmp6, |
391 | &entry->type_def.addrsel->list6) { | |
392 | netlbl_af6list_remove_entry(iter6); | |
393 | iter6->valid = 1; | |
394 | ret_val = netlbl_af6list_add(iter6, old_list6); | |
395 | netlbl_domhsh_audit_add(entry_old, NULL, iter6, | |
396 | ret_val, audit_info); | |
397 | if (ret_val != 0) | |
398 | goto add_return; | |
399 | } | |
400 | #endif /* IPv6 */ | |
401 | } else | |
402 | ret_val = -EINVAL; | |
403 | ||
404 | add_return: | |
405 | spin_unlock(&netlbl_domhsh_lock); | |
406 | rcu_read_unlock(); | |
d15c345f PM |
407 | return ret_val; |
408 | } | |
409 | ||
410 | /** | |
411 | * netlbl_domhsh_add_default - Adds the default entry to the domain hash table | |
412 | * @entry: the entry to add | |
95d4e6be | 413 | * @audit_info: NetLabel audit information |
d15c345f PM |
414 | * |
415 | * Description: | |
416 | * Adds a new default entry to the domain hash table and handles any updates | |
417 | * to the lower level protocol handler (i.e. CIPSO). Returns zero on success, | |
418 | * negative on failure. | |
419 | * | |
420 | */ | |
95d4e6be PM |
421 | int netlbl_domhsh_add_default(struct netlbl_dom_map *entry, |
422 | struct netlbl_audit *audit_info) | |
d15c345f | 423 | { |
95d4e6be | 424 | return netlbl_domhsh_add(entry, audit_info); |
d15c345f PM |
425 | } |
426 | ||
427 | /** | |
b1edeb10 PM |
428 | * netlbl_domhsh_remove_entry - Removes a given entry from the domain table |
429 | * @entry: the entry to remove | |
95d4e6be | 430 | * @audit_info: NetLabel audit information |
d15c345f PM |
431 | * |
432 | * Description: | |
433 | * Removes an entry from the domain hash table and handles any updates to the | |
b1edeb10 PM |
434 | * lower level protocol handler (i.e. CIPSO). Caller is responsible for |
435 | * ensuring that the RCU read lock is held. Returns zero on success, negative | |
436 | * on failure. | |
d15c345f PM |
437 | * |
438 | */ | |
b1edeb10 PM |
439 | int netlbl_domhsh_remove_entry(struct netlbl_dom_map *entry, |
440 | struct netlbl_audit *audit_info) | |
d15c345f | 441 | { |
b1edeb10 | 442 | int ret_val = 0; |
32f50cde | 443 | struct audit_buffer *audit_buf; |
d15c345f | 444 | |
d15c345f | 445 | if (entry == NULL) |
b1edeb10 PM |
446 | return -ENOENT; |
447 | ||
1c3fad93 PM |
448 | spin_lock(&netlbl_domhsh_lock); |
449 | if (entry->valid) { | |
450 | entry->valid = 0; | |
451 | if (entry != rcu_dereference(netlbl_domhsh_def)) | |
d15c345f | 452 | list_del_rcu(&entry->list); |
1c3fad93 | 453 | else |
a9b3cd7f | 454 | RCU_INIT_POINTER(netlbl_domhsh_def, NULL); |
b1edeb10 PM |
455 | } else |
456 | ret_val = -ENOENT; | |
1c3fad93 | 457 | spin_unlock(&netlbl_domhsh_lock); |
32f50cde | 458 | |
95d4e6be | 459 | audit_buf = netlbl_audit_start_common(AUDIT_MAC_MAP_DEL, audit_info); |
de64688f PM |
460 | if (audit_buf != NULL) { |
461 | audit_log_format(audit_buf, | |
462 | " nlbl_domain=%s res=%u", | |
463 | entry->domain ? entry->domain : "(default)", | |
464 | ret_val == 0 ? 1 : 0); | |
465 | audit_log_end(audit_buf); | |
466 | } | |
95d4e6be | 467 | |
b1edeb10 | 468 | if (ret_val == 0) { |
63c41688 PM |
469 | struct netlbl_af4list *iter4; |
470 | struct netlbl_domaddr4_map *map4; | |
471 | ||
b1edeb10 | 472 | switch (entry->type) { |
63c41688 PM |
473 | case NETLBL_NLTYPE_ADDRSELECT: |
474 | netlbl_af4list_foreach_rcu(iter4, | |
475 | &entry->type_def.addrsel->list4) { | |
476 | map4 = netlbl_domhsh_addr4_entry(iter4); | |
477 | cipso_v4_doi_putdef(map4->type_def.cipsov4); | |
478 | } | |
479 | /* no need to check the IPv6 list since we currently | |
480 | * support only unlabeled protocols for IPv6 */ | |
481 | break; | |
b1edeb10 PM |
482 | case NETLBL_NLTYPE_CIPSOV4: |
483 | cipso_v4_doi_putdef(entry->type_def.cipsov4); | |
484 | break; | |
485 | } | |
4be2700f | 486 | call_rcu(&entry->rcu, netlbl_domhsh_free_entry); |
b1edeb10 PM |
487 | } |
488 | ||
489 | return ret_val; | |
490 | } | |
491 | ||
6c2e8ac0 PM |
492 | /** |
493 | * netlbl_domhsh_remove_af4 - Removes an address selector entry | |
494 | * @domain: the domain | |
495 | * @addr: IPv4 address | |
496 | * @mask: IPv4 address mask | |
497 | * @audit_info: NetLabel audit information | |
498 | * | |
499 | * Description: | |
500 | * Removes an individual address selector from a domain mapping and potentially | |
501 | * the entire mapping if it is empty. Returns zero on success, negative values | |
502 | * on failure. | |
503 | * | |
504 | */ | |
505 | int netlbl_domhsh_remove_af4(const char *domain, | |
506 | const struct in_addr *addr, | |
507 | const struct in_addr *mask, | |
508 | struct netlbl_audit *audit_info) | |
509 | { | |
510 | struct netlbl_dom_map *entry_map; | |
511 | struct netlbl_af4list *entry_addr; | |
512 | struct netlbl_af4list *iter4; | |
dfd56b8b | 513 | #if IS_ENABLED(CONFIG_IPV6) |
6c2e8ac0 PM |
514 | struct netlbl_af6list *iter6; |
515 | #endif /* IPv6 */ | |
516 | struct netlbl_domaddr4_map *entry; | |
517 | ||
518 | rcu_read_lock(); | |
519 | ||
520 | if (domain) | |
521 | entry_map = netlbl_domhsh_search(domain); | |
522 | else | |
523 | entry_map = netlbl_domhsh_search_def(domain); | |
524 | if (entry_map == NULL || entry_map->type != NETLBL_NLTYPE_ADDRSELECT) | |
525 | goto remove_af4_failure; | |
526 | ||
527 | spin_lock(&netlbl_domhsh_lock); | |
528 | entry_addr = netlbl_af4list_remove(addr->s_addr, mask->s_addr, | |
529 | &entry_map->type_def.addrsel->list4); | |
530 | spin_unlock(&netlbl_domhsh_lock); | |
531 | ||
532 | if (entry_addr == NULL) | |
533 | goto remove_af4_failure; | |
534 | netlbl_af4list_foreach_rcu(iter4, &entry_map->type_def.addrsel->list4) | |
535 | goto remove_af4_single_addr; | |
dfd56b8b | 536 | #if IS_ENABLED(CONFIG_IPV6) |
6c2e8ac0 PM |
537 | netlbl_af6list_foreach_rcu(iter6, &entry_map->type_def.addrsel->list6) |
538 | goto remove_af4_single_addr; | |
539 | #endif /* IPv6 */ | |
540 | /* the domain mapping is empty so remove it from the mapping table */ | |
541 | netlbl_domhsh_remove_entry(entry_map, audit_info); | |
542 | ||
543 | remove_af4_single_addr: | |
544 | rcu_read_unlock(); | |
545 | /* yick, we can't use call_rcu here because we don't have a rcu head | |
546 | * pointer but hopefully this should be a rare case so the pause | |
547 | * shouldn't be a problem */ | |
548 | synchronize_rcu(); | |
549 | entry = netlbl_domhsh_addr4_entry(entry_addr); | |
550 | cipso_v4_doi_putdef(entry->type_def.cipsov4); | |
551 | kfree(entry); | |
552 | return 0; | |
553 | ||
554 | remove_af4_failure: | |
555 | rcu_read_unlock(); | |
556 | return -ENOENT; | |
557 | } | |
558 | ||
b1edeb10 PM |
559 | /** |
560 | * netlbl_domhsh_remove - Removes an entry from the domain hash table | |
561 | * @domain: the domain to remove | |
562 | * @audit_info: NetLabel audit information | |
563 | * | |
564 | * Description: | |
565 | * Removes an entry from the domain hash table and handles any updates to the | |
566 | * lower level protocol handler (i.e. CIPSO). Returns zero on success, | |
567 | * negative on failure. | |
568 | * | |
569 | */ | |
570 | int netlbl_domhsh_remove(const char *domain, struct netlbl_audit *audit_info) | |
571 | { | |
572 | int ret_val; | |
573 | struct netlbl_dom_map *entry; | |
574 | ||
575 | rcu_read_lock(); | |
576 | if (domain) | |
577 | entry = netlbl_domhsh_search(domain); | |
578 | else | |
579 | entry = netlbl_domhsh_search_def(domain); | |
580 | ret_val = netlbl_domhsh_remove_entry(entry, audit_info); | |
581 | rcu_read_unlock(); | |
582 | ||
d15c345f PM |
583 | return ret_val; |
584 | } | |
585 | ||
586 | /** | |
587 | * netlbl_domhsh_remove_default - Removes the default entry from the table | |
95d4e6be | 588 | * @audit_info: NetLabel audit information |
d15c345f PM |
589 | * |
590 | * Description: | |
591 | * Removes/resets the default entry for the domain hash table and handles any | |
592 | * updates to the lower level protocol handler (i.e. CIPSO). Returns zero on | |
593 | * success, non-zero on failure. | |
594 | * | |
595 | */ | |
95d4e6be | 596 | int netlbl_domhsh_remove_default(struct netlbl_audit *audit_info) |
d15c345f | 597 | { |
95d4e6be | 598 | return netlbl_domhsh_remove(NULL, audit_info); |
d15c345f PM |
599 | } |
600 | ||
601 | /** | |
602 | * netlbl_domhsh_getentry - Get an entry from the domain hash table | |
603 | * @domain: the domain name to search for | |
604 | * | |
605 | * Description: | |
606 | * Look through the domain hash table searching for an entry to match @domain, | |
25985edc | 607 | * return a pointer to a copy of the entry or NULL. The caller is responsible |
d15c345f PM |
608 | * for ensuring that rcu_read_[un]lock() is called. |
609 | * | |
610 | */ | |
611 | struct netlbl_dom_map *netlbl_domhsh_getentry(const char *domain) | |
612 | { | |
b64397e0 | 613 | return netlbl_domhsh_search_def(domain); |
d15c345f PM |
614 | } |
615 | ||
63c41688 PM |
616 | /** |
617 | * netlbl_domhsh_getentry_af4 - Get an entry from the domain hash table | |
618 | * @domain: the domain name to search for | |
619 | * @addr: the IP address to search for | |
620 | * | |
621 | * Description: | |
622 | * Look through the domain hash table searching for an entry to match @domain | |
623 | * and @addr, return a pointer to a copy of the entry or NULL. The caller is | |
624 | * responsible for ensuring that rcu_read_[un]lock() is called. | |
625 | * | |
626 | */ | |
627 | struct netlbl_domaddr4_map *netlbl_domhsh_getentry_af4(const char *domain, | |
628 | __be32 addr) | |
629 | { | |
630 | struct netlbl_dom_map *dom_iter; | |
631 | struct netlbl_af4list *addr_iter; | |
632 | ||
633 | dom_iter = netlbl_domhsh_search_def(domain); | |
634 | if (dom_iter == NULL) | |
635 | return NULL; | |
636 | if (dom_iter->type != NETLBL_NLTYPE_ADDRSELECT) | |
637 | return NULL; | |
638 | ||
639 | addr_iter = netlbl_af4list_search(addr, | |
640 | &dom_iter->type_def.addrsel->list4); | |
641 | if (addr_iter == NULL) | |
642 | return NULL; | |
643 | ||
644 | return netlbl_domhsh_addr4_entry(addr_iter); | |
645 | } | |
646 | ||
dfd56b8b | 647 | #if IS_ENABLED(CONFIG_IPV6) |
63c41688 PM |
648 | /** |
649 | * netlbl_domhsh_getentry_af6 - Get an entry from the domain hash table | |
650 | * @domain: the domain name to search for | |
651 | * @addr: the IP address to search for | |
652 | * | |
653 | * Description: | |
654 | * Look through the domain hash table searching for an entry to match @domain | |
655 | * and @addr, return a pointer to a copy of the entry or NULL. The caller is | |
656 | * responsible for ensuring that rcu_read_[un]lock() is called. | |
657 | * | |
658 | */ | |
659 | struct netlbl_domaddr6_map *netlbl_domhsh_getentry_af6(const char *domain, | |
660 | const struct in6_addr *addr) | |
661 | { | |
662 | struct netlbl_dom_map *dom_iter; | |
663 | struct netlbl_af6list *addr_iter; | |
664 | ||
665 | dom_iter = netlbl_domhsh_search_def(domain); | |
666 | if (dom_iter == NULL) | |
667 | return NULL; | |
668 | if (dom_iter->type != NETLBL_NLTYPE_ADDRSELECT) | |
669 | return NULL; | |
670 | ||
671 | addr_iter = netlbl_af6list_search(addr, | |
672 | &dom_iter->type_def.addrsel->list6); | |
673 | if (addr_iter == NULL) | |
674 | return NULL; | |
675 | ||
676 | return netlbl_domhsh_addr6_entry(addr_iter); | |
677 | } | |
678 | #endif /* IPv6 */ | |
679 | ||
d15c345f | 680 | /** |
fcd48280 PM |
681 | * netlbl_domhsh_walk - Iterate through the domain mapping hash table |
682 | * @skip_bkt: the number of buckets to skip at the start | |
683 | * @skip_chain: the number of entries to skip in the first iterated bucket | |
684 | * @callback: callback for each entry | |
685 | * @cb_arg: argument for the callback function | |
d15c345f PM |
686 | * |
687 | * Description: | |
fcd48280 PM |
688 | * Interate over the domain mapping hash table, skipping the first @skip_bkt |
689 | * buckets and @skip_chain entries. For each entry in the table call | |
690 | * @callback, if @callback returns a negative value stop 'walking' through the | |
691 | * table and return. Updates the values in @skip_bkt and @skip_chain on | |
af901ca1 | 692 | * return. Returns zero on success, negative values on failure. |
d15c345f PM |
693 | * |
694 | */ | |
fcd48280 PM |
695 | int netlbl_domhsh_walk(u32 *skip_bkt, |
696 | u32 *skip_chain, | |
697 | int (*callback) (struct netlbl_dom_map *entry, void *arg), | |
698 | void *cb_arg) | |
d15c345f | 699 | { |
fcd48280 PM |
700 | int ret_val = -ENOENT; |
701 | u32 iter_bkt; | |
56196701 | 702 | struct list_head *iter_list; |
fcd48280 PM |
703 | struct netlbl_dom_map *iter_entry; |
704 | u32 chain_cnt = 0; | |
d15c345f | 705 | |
d15c345f | 706 | rcu_read_lock(); |
fcd48280 PM |
707 | for (iter_bkt = *skip_bkt; |
708 | iter_bkt < rcu_dereference(netlbl_domhsh)->size; | |
709 | iter_bkt++, chain_cnt = 0) { | |
56196701 PM |
710 | iter_list = &rcu_dereference(netlbl_domhsh)->tbl[iter_bkt]; |
711 | list_for_each_entry_rcu(iter_entry, iter_list, list) | |
fcd48280 PM |
712 | if (iter_entry->valid) { |
713 | if (chain_cnt++ < *skip_chain) | |
714 | continue; | |
715 | ret_val = callback(iter_entry, cb_arg); | |
716 | if (ret_val < 0) { | |
717 | chain_cnt--; | |
718 | goto walk_return; | |
719 | } | |
d15c345f | 720 | } |
fcd48280 | 721 | } |
d15c345f | 722 | |
fcd48280 | 723 | walk_return: |
d15c345f | 724 | rcu_read_unlock(); |
fcd48280 PM |
725 | *skip_bkt = iter_bkt; |
726 | *skip_chain = chain_cnt; | |
727 | return ret_val; | |
d15c345f | 728 | } |