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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 | * | |
9 | * Author: Paul Moore <paul.moore@hp.com> | |
10 | * | |
11 | */ | |
12 | ||
13 | /* | |
14 | * (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008 | |
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> | |
33 | #include <linux/rculist.h> | |
34 | #include <linux/skbuff.h> | |
35 | #include <linux/spinlock.h> | |
36 | #include <linux/string.h> | |
37 | #include <linux/audit.h> | |
38 | #include <linux/slab.h> | |
39 | #include <net/netlabel.h> | |
40 | #include <net/cipso_ipv4.h> | |
41 | #include <asm/bug.h> | |
42 | ||
43 | #include "netlabel_mgmt.h" | |
44 | #include "netlabel_addrlist.h" | |
45 | #include "netlabel_domainhash.h" | |
46 | #include "netlabel_user.h" | |
47 | ||
48 | struct netlbl_domhsh_tbl { | |
49 | struct list_head *tbl; | |
50 | u32 size; | |
51 | }; | |
52 | ||
53 | /* Domain hash table */ | |
54 | /* updates should be so rare that having one spinlock for the entire hash table | |
55 | * should be okay */ | |
56 | static DEFINE_SPINLOCK(netlbl_domhsh_lock); | |
57 | #define netlbl_domhsh_rcu_deref(p) \ | |
58 | rcu_dereference_check(p, rcu_read_lock_held() || \ | |
59 | lockdep_is_held(&netlbl_domhsh_lock)) | |
60 | static struct netlbl_domhsh_tbl *netlbl_domhsh = NULL; | |
61 | static struct netlbl_dom_map *netlbl_domhsh_def = NULL; | |
62 | ||
63 | /* | |
64 | * Domain Hash Table Helper Functions | |
65 | */ | |
66 | ||
67 | /** | |
68 | * netlbl_domhsh_free_entry - Frees a domain hash table entry | |
69 | * @entry: the entry's RCU field | |
70 | * | |
71 | * Description: | |
72 | * This function is designed to be used as a callback to the call_rcu() | |
73 | * function so that the memory allocated to a hash table entry can be released | |
74 | * safely. | |
75 | * | |
76 | */ | |
77 | static void netlbl_domhsh_free_entry(struct rcu_head *entry) | |
78 | { | |
79 | struct netlbl_dom_map *ptr; | |
80 | struct netlbl_af4list *iter4; | |
81 | struct netlbl_af4list *tmp4; | |
82 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
83 | struct netlbl_af6list *iter6; | |
84 | struct netlbl_af6list *tmp6; | |
85 | #endif /* IPv6 */ | |
86 | ||
87 | ptr = container_of(entry, struct netlbl_dom_map, rcu); | |
88 | if (ptr->type == NETLBL_NLTYPE_ADDRSELECT) { | |
89 | netlbl_af4list_foreach_safe(iter4, tmp4, | |
90 | &ptr->type_def.addrsel->list4) { | |
91 | netlbl_af4list_remove_entry(iter4); | |
92 | kfree(netlbl_domhsh_addr4_entry(iter4)); | |
93 | } | |
94 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
95 | netlbl_af6list_foreach_safe(iter6, tmp6, | |
96 | &ptr->type_def.addrsel->list6) { | |
97 | netlbl_af6list_remove_entry(iter6); | |
98 | kfree(netlbl_domhsh_addr6_entry(iter6)); | |
99 | } | |
100 | #endif /* IPv6 */ | |
101 | } | |
102 | kfree(ptr->domain); | |
103 | kfree(ptr); | |
104 | } | |
105 | ||
106 | /** | |
107 | * netlbl_domhsh_hash - Hashing function for the domain hash table | |
108 | * @domain: the domain name to hash | |
109 | * | |
110 | * Description: | |
111 | * This is the hashing function for the domain hash table, it returns the | |
112 | * correct bucket number for the domain. The caller is responsible for | |
113 | * ensuring that the hash table is protected with either a RCU read lock or the | |
114 | * hash table lock. | |
115 | * | |
116 | */ | |
117 | static u32 netlbl_domhsh_hash(const char *key) | |
118 | { | |
119 | u32 iter; | |
120 | u32 val; | |
121 | u32 len; | |
122 | ||
123 | /* This is taken (with slight modification) from | |
124 | * security/selinux/ss/symtab.c:symhash() */ | |
125 | ||
126 | for (iter = 0, val = 0, len = strlen(key); iter < len; iter++) | |
127 | val = (val << 4 | (val >> (8 * sizeof(u32) - 4))) ^ key[iter]; | |
128 | return val & (netlbl_domhsh_rcu_deref(netlbl_domhsh)->size - 1); | |
129 | } | |
130 | ||
131 | /** | |
132 | * netlbl_domhsh_search - Search for a domain entry | |
133 | * @domain: the domain | |
134 | * | |
135 | * Description: | |
136 | * Searches the domain hash table and returns a pointer to the hash table | |
137 | * entry if found, otherwise NULL is returned. The caller is responsible for | |
138 | * ensuring that the hash table is protected with either a RCU read lock or the | |
139 | * hash table lock. | |
140 | * | |
141 | */ | |
142 | static struct netlbl_dom_map *netlbl_domhsh_search(const char *domain) | |
143 | { | |
144 | u32 bkt; | |
145 | struct list_head *bkt_list; | |
146 | struct netlbl_dom_map *iter; | |
147 | ||
148 | if (domain != NULL) { | |
149 | bkt = netlbl_domhsh_hash(domain); | |
150 | bkt_list = &netlbl_domhsh_rcu_deref(netlbl_domhsh)->tbl[bkt]; | |
151 | list_for_each_entry_rcu(iter, bkt_list, list) | |
152 | if (iter->valid && strcmp(iter->domain, domain) == 0) | |
153 | return iter; | |
154 | } | |
155 | ||
156 | return NULL; | |
157 | } | |
158 | ||
159 | /** | |
160 | * netlbl_domhsh_search_def - Search for a domain entry | |
161 | * @domain: the domain | |
162 | * @def: return default if no match is found | |
163 | * | |
164 | * Description: | |
165 | * Searches the domain hash table and returns a pointer to the hash table | |
166 | * entry if an exact match is found, if an exact match is not present in the | |
167 | * hash table then the default entry is returned if valid otherwise NULL is | |
168 | * returned. The caller is responsible ensuring that the hash table is | |
169 | * protected with either a RCU read lock or the hash table lock. | |
170 | * | |
171 | */ | |
172 | static struct netlbl_dom_map *netlbl_domhsh_search_def(const char *domain) | |
173 | { | |
174 | struct netlbl_dom_map *entry; | |
175 | ||
176 | entry = netlbl_domhsh_search(domain); | |
177 | if (entry == NULL) { | |
178 | entry = netlbl_domhsh_rcu_deref(netlbl_domhsh_def); | |
179 | if (entry != NULL && !entry->valid) | |
180 | entry = NULL; | |
181 | } | |
182 | ||
183 | return entry; | |
184 | } | |
185 | ||
186 | /** | |
187 | * netlbl_domhsh_audit_add - Generate an audit entry for an add event | |
188 | * @entry: the entry being added | |
189 | * @addr4: the IPv4 address information | |
190 | * @addr6: the IPv6 address information | |
191 | * @result: the result code | |
192 | * @audit_info: NetLabel audit information | |
193 | * | |
194 | * Description: | |
195 | * Generate an audit record for adding a new NetLabel/LSM mapping entry with | |
196 | * the given information. Caller is responsible for holding the necessary | |
197 | * locks. | |
198 | * | |
199 | */ | |
200 | static void netlbl_domhsh_audit_add(struct netlbl_dom_map *entry, | |
201 | struct netlbl_af4list *addr4, | |
202 | struct netlbl_af6list *addr6, | |
203 | int result, | |
204 | struct netlbl_audit *audit_info) | |
205 | { | |
206 | struct audit_buffer *audit_buf; | |
207 | struct cipso_v4_doi *cipsov4 = NULL; | |
208 | u32 type; | |
209 | ||
210 | audit_buf = netlbl_audit_start_common(AUDIT_MAC_MAP_ADD, audit_info); | |
211 | if (audit_buf != NULL) { | |
212 | audit_log_format(audit_buf, " nlbl_domain=%s", | |
213 | entry->domain ? entry->domain : "(default)"); | |
214 | if (addr4 != NULL) { | |
215 | struct netlbl_domaddr4_map *map4; | |
216 | map4 = netlbl_domhsh_addr4_entry(addr4); | |
217 | type = map4->type; | |
218 | cipsov4 = map4->type_def.cipsov4; | |
219 | netlbl_af4list_audit_addr(audit_buf, 0, NULL, | |
220 | addr4->addr, addr4->mask); | |
221 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
222 | } else if (addr6 != NULL) { | |
223 | struct netlbl_domaddr6_map *map6; | |
224 | map6 = netlbl_domhsh_addr6_entry(addr6); | |
225 | type = map6->type; | |
226 | netlbl_af6list_audit_addr(audit_buf, 0, NULL, | |
227 | &addr6->addr, &addr6->mask); | |
228 | #endif /* IPv6 */ | |
229 | } else { | |
230 | type = entry->type; | |
231 | cipsov4 = entry->type_def.cipsov4; | |
232 | } | |
233 | switch (type) { | |
234 | case NETLBL_NLTYPE_UNLABELED: | |
235 | audit_log_format(audit_buf, " nlbl_protocol=unlbl"); | |
236 | break; | |
237 | case NETLBL_NLTYPE_CIPSOV4: | |
238 | BUG_ON(cipsov4 == NULL); | |
239 | audit_log_format(audit_buf, | |
240 | " nlbl_protocol=cipsov4 cipso_doi=%u", | |
241 | cipsov4->doi); | |
242 | break; | |
243 | } | |
244 | audit_log_format(audit_buf, " res=%u", result == 0 ? 1 : 0); | |
245 | audit_log_end(audit_buf); | |
246 | } | |
247 | } | |
248 | ||
249 | /* | |
250 | * Domain Hash Table Functions | |
251 | */ | |
252 | ||
253 | /** | |
254 | * netlbl_domhsh_init - Init for the domain hash | |
255 | * @size: the number of bits to use for the hash buckets | |
256 | * | |
257 | * Description: | |
258 | * Initializes the domain hash table, should be called only by | |
259 | * netlbl_user_init() during initialization. Returns zero on success, non-zero | |
260 | * values on error. | |
261 | * | |
262 | */ | |
263 | int __init netlbl_domhsh_init(u32 size) | |
264 | { | |
265 | u32 iter; | |
266 | struct netlbl_domhsh_tbl *hsh_tbl; | |
267 | ||
268 | if (size == 0) | |
269 | return -EINVAL; | |
270 | ||
271 | hsh_tbl = kmalloc(sizeof(*hsh_tbl), GFP_KERNEL); | |
272 | if (hsh_tbl == NULL) | |
273 | return -ENOMEM; | |
274 | hsh_tbl->size = 1 << size; | |
275 | hsh_tbl->tbl = kcalloc(hsh_tbl->size, | |
276 | sizeof(struct list_head), | |
277 | GFP_KERNEL); | |
278 | if (hsh_tbl->tbl == NULL) { | |
279 | kfree(hsh_tbl); | |
280 | return -ENOMEM; | |
281 | } | |
282 | for (iter = 0; iter < hsh_tbl->size; iter++) | |
283 | INIT_LIST_HEAD(&hsh_tbl->tbl[iter]); | |
284 | ||
285 | spin_lock(&netlbl_domhsh_lock); | |
286 | rcu_assign_pointer(netlbl_domhsh, hsh_tbl); | |
287 | spin_unlock(&netlbl_domhsh_lock); | |
288 | ||
289 | return 0; | |
290 | } | |
291 | ||
292 | /** | |
293 | * netlbl_domhsh_add - Adds a entry to the domain hash table | |
294 | * @entry: the entry to add | |
295 | * @audit_info: NetLabel audit information | |
296 | * | |
297 | * Description: | |
298 | * Adds a new entry to the domain hash table and handles any updates to the | |
299 | * lower level protocol handler (i.e. CIPSO). Returns zero on success, | |
300 | * negative on failure. | |
301 | * | |
302 | */ | |
303 | int netlbl_domhsh_add(struct netlbl_dom_map *entry, | |
304 | struct netlbl_audit *audit_info) | |
305 | { | |
306 | int ret_val = 0; | |
307 | struct netlbl_dom_map *entry_old; | |
308 | struct netlbl_af4list *iter4; | |
309 | struct netlbl_af4list *tmp4; | |
310 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
311 | struct netlbl_af6list *iter6; | |
312 | struct netlbl_af6list *tmp6; | |
313 | #endif /* IPv6 */ | |
314 | ||
315 | /* XXX - we can remove this RCU read lock as the spinlock protects the | |
316 | * entire function, but before we do we need to fixup the | |
317 | * netlbl_af[4,6]list RCU functions to do "the right thing" with | |
318 | * respect to rcu_dereference() when only a spinlock is held. */ | |
319 | rcu_read_lock(); | |
320 | spin_lock(&netlbl_domhsh_lock); | |
321 | if (entry->domain != NULL) | |
322 | entry_old = netlbl_domhsh_search(entry->domain); | |
323 | else | |
324 | entry_old = netlbl_domhsh_search_def(entry->domain); | |
325 | if (entry_old == NULL) { | |
326 | entry->valid = 1; | |
327 | ||
328 | if (entry->domain != NULL) { | |
329 | u32 bkt = netlbl_domhsh_hash(entry->domain); | |
330 | list_add_tail_rcu(&entry->list, | |
331 | &rcu_dereference(netlbl_domhsh)->tbl[bkt]); | |
332 | } else { | |
333 | INIT_LIST_HEAD(&entry->list); | |
334 | rcu_assign_pointer(netlbl_domhsh_def, entry); | |
335 | } | |
336 | ||
337 | if (entry->type == NETLBL_NLTYPE_ADDRSELECT) { | |
338 | netlbl_af4list_foreach_rcu(iter4, | |
339 | &entry->type_def.addrsel->list4) | |
340 | netlbl_domhsh_audit_add(entry, iter4, NULL, | |
341 | ret_val, audit_info); | |
342 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
343 | netlbl_af6list_foreach_rcu(iter6, | |
344 | &entry->type_def.addrsel->list6) | |
345 | netlbl_domhsh_audit_add(entry, NULL, iter6, | |
346 | ret_val, audit_info); | |
347 | #endif /* IPv6 */ | |
348 | } else | |
349 | netlbl_domhsh_audit_add(entry, NULL, NULL, | |
350 | ret_val, audit_info); | |
351 | } else if (entry_old->type == NETLBL_NLTYPE_ADDRSELECT && | |
352 | entry->type == NETLBL_NLTYPE_ADDRSELECT) { | |
353 | struct list_head *old_list4; | |
354 | struct list_head *old_list6; | |
355 | ||
356 | old_list4 = &entry_old->type_def.addrsel->list4; | |
357 | old_list6 = &entry_old->type_def.addrsel->list6; | |
358 | ||
359 | /* we only allow the addition of address selectors if all of | |
360 | * the selectors do not exist in the existing domain map */ | |
361 | netlbl_af4list_foreach_rcu(iter4, | |
362 | &entry->type_def.addrsel->list4) | |
363 | if (netlbl_af4list_search_exact(iter4->addr, | |
364 | iter4->mask, | |
365 | old_list4)) { | |
366 | ret_val = -EEXIST; | |
367 | goto add_return; | |
368 | } | |
369 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
370 | netlbl_af6list_foreach_rcu(iter6, | |
371 | &entry->type_def.addrsel->list6) | |
372 | if (netlbl_af6list_search_exact(&iter6->addr, | |
373 | &iter6->mask, | |
374 | old_list6)) { | |
375 | ret_val = -EEXIST; | |
376 | goto add_return; | |
377 | } | |
378 | #endif /* IPv6 */ | |
379 | ||
380 | netlbl_af4list_foreach_safe(iter4, tmp4, | |
381 | &entry->type_def.addrsel->list4) { | |
382 | netlbl_af4list_remove_entry(iter4); | |
383 | iter4->valid = 1; | |
384 | ret_val = netlbl_af4list_add(iter4, old_list4); | |
385 | netlbl_domhsh_audit_add(entry_old, iter4, NULL, | |
386 | ret_val, audit_info); | |
387 | if (ret_val != 0) | |
388 | goto add_return; | |
389 | } | |
390 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
391 | netlbl_af6list_foreach_safe(iter6, tmp6, | |
392 | &entry->type_def.addrsel->list6) { | |
393 | netlbl_af6list_remove_entry(iter6); | |
394 | iter6->valid = 1; | |
395 | ret_val = netlbl_af6list_add(iter6, old_list6); | |
396 | netlbl_domhsh_audit_add(entry_old, NULL, iter6, | |
397 | ret_val, audit_info); | |
398 | if (ret_val != 0) | |
399 | goto add_return; | |
400 | } | |
401 | #endif /* IPv6 */ | |
402 | } else | |
403 | ret_val = -EINVAL; | |
404 | ||
405 | add_return: | |
406 | spin_unlock(&netlbl_domhsh_lock); | |
407 | rcu_read_unlock(); | |
408 | return ret_val; | |
409 | } | |
410 | ||
411 | /** | |
412 | * netlbl_domhsh_add_default - Adds the default entry to the domain hash table | |
413 | * @entry: the entry to add | |
414 | * @audit_info: NetLabel audit information | |
415 | * | |
416 | * Description: | |
417 | * Adds a new default entry to the domain hash table and handles any updates | |
418 | * to the lower level protocol handler (i.e. CIPSO). Returns zero on success, | |
419 | * negative on failure. | |
420 | * | |
421 | */ | |
422 | int netlbl_domhsh_add_default(struct netlbl_dom_map *entry, | |
423 | struct netlbl_audit *audit_info) | |
424 | { | |
425 | return netlbl_domhsh_add(entry, audit_info); | |
426 | } | |
427 | ||
428 | /** | |
429 | * netlbl_domhsh_remove_entry - Removes a given entry from the domain table | |
430 | * @entry: the entry to remove | |
431 | * @audit_info: NetLabel audit information | |
432 | * | |
433 | * Description: | |
434 | * Removes an entry from the domain hash table and handles any updates to the | |
435 | * lower level protocol handler (i.e. CIPSO). Caller is responsible for | |
436 | * ensuring that the RCU read lock is held. Returns zero on success, negative | |
437 | * on failure. | |
438 | * | |
439 | */ | |
440 | int netlbl_domhsh_remove_entry(struct netlbl_dom_map *entry, | |
441 | struct netlbl_audit *audit_info) | |
442 | { | |
443 | int ret_val = 0; | |
444 | struct audit_buffer *audit_buf; | |
445 | ||
446 | if (entry == NULL) | |
447 | return -ENOENT; | |
448 | ||
449 | spin_lock(&netlbl_domhsh_lock); | |
450 | if (entry->valid) { | |
451 | entry->valid = 0; | |
452 | if (entry != rcu_dereference(netlbl_domhsh_def)) | |
453 | list_del_rcu(&entry->list); | |
454 | else | |
455 | rcu_assign_pointer(netlbl_domhsh_def, NULL); | |
456 | } else | |
457 | ret_val = -ENOENT; | |
458 | spin_unlock(&netlbl_domhsh_lock); | |
459 | ||
460 | audit_buf = netlbl_audit_start_common(AUDIT_MAC_MAP_DEL, audit_info); | |
461 | if (audit_buf != NULL) { | |
462 | audit_log_format(audit_buf, | |
463 | " nlbl_domain=%s res=%u", | |
464 | entry->domain ? entry->domain : "(default)", | |
465 | ret_val == 0 ? 1 : 0); | |
466 | audit_log_end(audit_buf); | |
467 | } | |
468 | ||
469 | if (ret_val == 0) { | |
470 | struct netlbl_af4list *iter4; | |
471 | struct netlbl_domaddr4_map *map4; | |
472 | ||
473 | switch (entry->type) { | |
474 | case NETLBL_NLTYPE_ADDRSELECT: | |
475 | netlbl_af4list_foreach_rcu(iter4, | |
476 | &entry->type_def.addrsel->list4) { | |
477 | map4 = netlbl_domhsh_addr4_entry(iter4); | |
478 | cipso_v4_doi_putdef(map4->type_def.cipsov4); | |
479 | } | |
480 | /* no need to check the IPv6 list since we currently | |
481 | * support only unlabeled protocols for IPv6 */ | |
482 | break; | |
483 | case NETLBL_NLTYPE_CIPSOV4: | |
484 | cipso_v4_doi_putdef(entry->type_def.cipsov4); | |
485 | break; | |
486 | } | |
487 | call_rcu(&entry->rcu, netlbl_domhsh_free_entry); | |
488 | } | |
489 | ||
490 | return ret_val; | |
491 | } | |
492 | ||
493 | /** | |
494 | * netlbl_domhsh_remove_af4 - Removes an address selector entry | |
495 | * @domain: the domain | |
496 | * @addr: IPv4 address | |
497 | * @mask: IPv4 address mask | |
498 | * @audit_info: NetLabel audit information | |
499 | * | |
500 | * Description: | |
501 | * Removes an individual address selector from a domain mapping and potentially | |
502 | * the entire mapping if it is empty. Returns zero on success, negative values | |
503 | * on failure. | |
504 | * | |
505 | */ | |
506 | int netlbl_domhsh_remove_af4(const char *domain, | |
507 | const struct in_addr *addr, | |
508 | const struct in_addr *mask, | |
509 | struct netlbl_audit *audit_info) | |
510 | { | |
511 | struct netlbl_dom_map *entry_map; | |
512 | struct netlbl_af4list *entry_addr; | |
513 | struct netlbl_af4list *iter4; | |
514 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
515 | struct netlbl_af6list *iter6; | |
516 | #endif /* IPv6 */ | |
517 | struct netlbl_domaddr4_map *entry; | |
518 | ||
519 | rcu_read_lock(); | |
520 | ||
521 | if (domain) | |
522 | entry_map = netlbl_domhsh_search(domain); | |
523 | else | |
524 | entry_map = netlbl_domhsh_search_def(domain); | |
525 | if (entry_map == NULL || entry_map->type != NETLBL_NLTYPE_ADDRSELECT) | |
526 | goto remove_af4_failure; | |
527 | ||
528 | spin_lock(&netlbl_domhsh_lock); | |
529 | entry_addr = netlbl_af4list_remove(addr->s_addr, mask->s_addr, | |
530 | &entry_map->type_def.addrsel->list4); | |
531 | spin_unlock(&netlbl_domhsh_lock); | |
532 | ||
533 | if (entry_addr == NULL) | |
534 | goto remove_af4_failure; | |
535 | netlbl_af4list_foreach_rcu(iter4, &entry_map->type_def.addrsel->list4) | |
536 | goto remove_af4_single_addr; | |
537 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
538 | netlbl_af6list_foreach_rcu(iter6, &entry_map->type_def.addrsel->list6) | |
539 | goto remove_af4_single_addr; | |
540 | #endif /* IPv6 */ | |
541 | /* the domain mapping is empty so remove it from the mapping table */ | |
542 | netlbl_domhsh_remove_entry(entry_map, audit_info); | |
543 | ||
544 | remove_af4_single_addr: | |
545 | rcu_read_unlock(); | |
546 | /* yick, we can't use call_rcu here because we don't have a rcu head | |
547 | * pointer but hopefully this should be a rare case so the pause | |
548 | * shouldn't be a problem */ | |
549 | synchronize_rcu(); | |
550 | entry = netlbl_domhsh_addr4_entry(entry_addr); | |
551 | cipso_v4_doi_putdef(entry->type_def.cipsov4); | |
552 | kfree(entry); | |
553 | return 0; | |
554 | ||
555 | remove_af4_failure: | |
556 | rcu_read_unlock(); | |
557 | return -ENOENT; | |
558 | } | |
559 | ||
560 | /** | |
561 | * netlbl_domhsh_remove - Removes an entry from the domain hash table | |
562 | * @domain: the domain to remove | |
563 | * @audit_info: NetLabel audit information | |
564 | * | |
565 | * Description: | |
566 | * Removes an entry from the domain hash table and handles any updates to the | |
567 | * lower level protocol handler (i.e. CIPSO). Returns zero on success, | |
568 | * negative on failure. | |
569 | * | |
570 | */ | |
571 | int netlbl_domhsh_remove(const char *domain, struct netlbl_audit *audit_info) | |
572 | { | |
573 | int ret_val; | |
574 | struct netlbl_dom_map *entry; | |
575 | ||
576 | rcu_read_lock(); | |
577 | if (domain) | |
578 | entry = netlbl_domhsh_search(domain); | |
579 | else | |
580 | entry = netlbl_domhsh_search_def(domain); | |
581 | ret_val = netlbl_domhsh_remove_entry(entry, audit_info); | |
582 | rcu_read_unlock(); | |
583 | ||
584 | return ret_val; | |
585 | } | |
586 | ||
587 | /** | |
588 | * netlbl_domhsh_remove_default - Removes the default entry from the table | |
589 | * @audit_info: NetLabel audit information | |
590 | * | |
591 | * Description: | |
592 | * Removes/resets the default entry for the domain hash table and handles any | |
593 | * updates to the lower level protocol handler (i.e. CIPSO). Returns zero on | |
594 | * success, non-zero on failure. | |
595 | * | |
596 | */ | |
597 | int netlbl_domhsh_remove_default(struct netlbl_audit *audit_info) | |
598 | { | |
599 | return netlbl_domhsh_remove(NULL, audit_info); | |
600 | } | |
601 | ||
602 | /** | |
603 | * netlbl_domhsh_getentry - Get an entry from the domain hash table | |
604 | * @domain: the domain name to search for | |
605 | * | |
606 | * Description: | |
607 | * Look through the domain hash table searching for an entry to match @domain, | |
608 | * return a pointer to a copy of the entry or NULL. The caller is responsible | |
609 | * for ensuring that rcu_read_[un]lock() is called. | |
610 | * | |
611 | */ | |
612 | struct netlbl_dom_map *netlbl_domhsh_getentry(const char *domain) | |
613 | { | |
614 | return netlbl_domhsh_search_def(domain); | |
615 | } | |
616 | ||
617 | /** | |
618 | * netlbl_domhsh_getentry_af4 - Get an entry from the domain hash table | |
619 | * @domain: the domain name to search for | |
620 | * @addr: the IP address to search for | |
621 | * | |
622 | * Description: | |
623 | * Look through the domain hash table searching for an entry to match @domain | |
624 | * and @addr, return a pointer to a copy of the entry or NULL. The caller is | |
625 | * responsible for ensuring that rcu_read_[un]lock() is called. | |
626 | * | |
627 | */ | |
628 | struct netlbl_domaddr4_map *netlbl_domhsh_getentry_af4(const char *domain, | |
629 | __be32 addr) | |
630 | { | |
631 | struct netlbl_dom_map *dom_iter; | |
632 | struct netlbl_af4list *addr_iter; | |
633 | ||
634 | dom_iter = netlbl_domhsh_search_def(domain); | |
635 | if (dom_iter == NULL) | |
636 | return NULL; | |
637 | if (dom_iter->type != NETLBL_NLTYPE_ADDRSELECT) | |
638 | return NULL; | |
639 | ||
640 | addr_iter = netlbl_af4list_search(addr, | |
641 | &dom_iter->type_def.addrsel->list4); | |
642 | if (addr_iter == NULL) | |
643 | return NULL; | |
644 | ||
645 | return netlbl_domhsh_addr4_entry(addr_iter); | |
646 | } | |
647 | ||
648 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
649 | /** | |
650 | * netlbl_domhsh_getentry_af6 - Get an entry from the domain hash table | |
651 | * @domain: the domain name to search for | |
652 | * @addr: the IP address to search for | |
653 | * | |
654 | * Description: | |
655 | * Look through the domain hash table searching for an entry to match @domain | |
656 | * and @addr, return a pointer to a copy of the entry or NULL. The caller is | |
657 | * responsible for ensuring that rcu_read_[un]lock() is called. | |
658 | * | |
659 | */ | |
660 | struct netlbl_domaddr6_map *netlbl_domhsh_getentry_af6(const char *domain, | |
661 | const struct in6_addr *addr) | |
662 | { | |
663 | struct netlbl_dom_map *dom_iter; | |
664 | struct netlbl_af6list *addr_iter; | |
665 | ||
666 | dom_iter = netlbl_domhsh_search_def(domain); | |
667 | if (dom_iter == NULL) | |
668 | return NULL; | |
669 | if (dom_iter->type != NETLBL_NLTYPE_ADDRSELECT) | |
670 | return NULL; | |
671 | ||
672 | addr_iter = netlbl_af6list_search(addr, | |
673 | &dom_iter->type_def.addrsel->list6); | |
674 | if (addr_iter == NULL) | |
675 | return NULL; | |
676 | ||
677 | return netlbl_domhsh_addr6_entry(addr_iter); | |
678 | } | |
679 | #endif /* IPv6 */ | |
680 | ||
681 | /** | |
682 | * netlbl_domhsh_walk - Iterate through the domain mapping hash table | |
683 | * @skip_bkt: the number of buckets to skip at the start | |
684 | * @skip_chain: the number of entries to skip in the first iterated bucket | |
685 | * @callback: callback for each entry | |
686 | * @cb_arg: argument for the callback function | |
687 | * | |
688 | * Description: | |
689 | * Interate over the domain mapping hash table, skipping the first @skip_bkt | |
690 | * buckets and @skip_chain entries. For each entry in the table call | |
691 | * @callback, if @callback returns a negative value stop 'walking' through the | |
692 | * table and return. Updates the values in @skip_bkt and @skip_chain on | |
693 | * return. Returns zero on success, negative values on failure. | |
694 | * | |
695 | */ | |
696 | int netlbl_domhsh_walk(u32 *skip_bkt, | |
697 | u32 *skip_chain, | |
698 | int (*callback) (struct netlbl_dom_map *entry, void *arg), | |
699 | void *cb_arg) | |
700 | { | |
701 | int ret_val = -ENOENT; | |
702 | u32 iter_bkt; | |
703 | struct list_head *iter_list; | |
704 | struct netlbl_dom_map *iter_entry; | |
705 | u32 chain_cnt = 0; | |
706 | ||
707 | rcu_read_lock(); | |
708 | for (iter_bkt = *skip_bkt; | |
709 | iter_bkt < rcu_dereference(netlbl_domhsh)->size; | |
710 | iter_bkt++, chain_cnt = 0) { | |
711 | iter_list = &rcu_dereference(netlbl_domhsh)->tbl[iter_bkt]; | |
712 | list_for_each_entry_rcu(iter_entry, iter_list, list) | |
713 | if (iter_entry->valid) { | |
714 | if (chain_cnt++ < *skip_chain) | |
715 | continue; | |
716 | ret_val = callback(iter_entry, cb_arg); | |
717 | if (ret_val < 0) { | |
718 | chain_cnt--; | |
719 | goto walk_return; | |
720 | } | |
721 | } | |
722 | } | |
723 | ||
724 | walk_return: | |
725 | rcu_read_unlock(); | |
726 | *skip_bkt = iter_bkt; | |
727 | *skip_chain = chain_cnt; | |
728 | return ret_val; | |
729 | } |