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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); | |
6a8b7f0c | 87 | if (ptr->def.type == NETLBL_NLTYPE_ADDRSELECT) { |
63c41688 | 88 | netlbl_af4list_foreach_safe(iter4, tmp4, |
6a8b7f0c | 89 | &ptr->def.addrsel->list4) { |
63c41688 PM |
90 | netlbl_af4list_remove_entry(iter4); |
91 | kfree(netlbl_domhsh_addr4_entry(iter4)); | |
92 | } | |
dfd56b8b | 93 | #if IS_ENABLED(CONFIG_IPV6) |
63c41688 | 94 | netlbl_af6list_foreach_safe(iter6, tmp6, |
6a8b7f0c | 95 | &ptr->def.addrsel->list6) { |
63c41688 PM |
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); | |
6a8b7f0c PM |
216 | type = map4->def.type; |
217 | cipsov4 = map4->def.cipso; | |
63c41688 PM |
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); | |
6a8b7f0c | 224 | type = map6->def.type; |
63c41688 PM |
225 | netlbl_af6list_audit_addr(audit_buf, 0, NULL, |
226 | &addr6->addr, &addr6->mask); | |
227 | #endif /* IPv6 */ | |
228 | } else { | |
6a8b7f0c PM |
229 | type = entry->def.type; |
230 | cipsov4 = entry->def.cipso; | |
63c41688 PM |
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 | ||
6b21e1b7 PM |
248 | /** |
249 | * netlbl_domhsh_validate - Validate a new domain mapping entry | |
250 | * @entry: the entry to validate | |
251 | * | |
252 | * This function validates the new domain mapping entry to ensure that it is | |
253 | * a valid entry. Returns zero on success, negative values on failure. | |
254 | * | |
255 | */ | |
256 | static int netlbl_domhsh_validate(const struct netlbl_dom_map *entry) | |
257 | { | |
258 | struct netlbl_af4list *iter4; | |
259 | struct netlbl_domaddr4_map *map4; | |
260 | #if IS_ENABLED(CONFIG_IPV6) | |
261 | struct netlbl_af6list *iter6; | |
262 | struct netlbl_domaddr6_map *map6; | |
263 | #endif /* IPv6 */ | |
264 | ||
265 | if (entry == NULL) | |
266 | return -EINVAL; | |
267 | ||
6a8b7f0c | 268 | switch (entry->def.type) { |
6b21e1b7 | 269 | case NETLBL_NLTYPE_UNLABELED: |
6a8b7f0c | 270 | if (entry->def.cipso != NULL || entry->def.addrsel != NULL) |
6b21e1b7 PM |
271 | return -EINVAL; |
272 | break; | |
273 | case NETLBL_NLTYPE_CIPSOV4: | |
6a8b7f0c | 274 | if (entry->def.cipso == NULL) |
6b21e1b7 PM |
275 | return -EINVAL; |
276 | break; | |
277 | case NETLBL_NLTYPE_ADDRSELECT: | |
6a8b7f0c | 278 | netlbl_af4list_foreach(iter4, &entry->def.addrsel->list4) { |
6b21e1b7 | 279 | map4 = netlbl_domhsh_addr4_entry(iter4); |
6a8b7f0c | 280 | switch (map4->def.type) { |
6b21e1b7 | 281 | case NETLBL_NLTYPE_UNLABELED: |
6a8b7f0c | 282 | if (map4->def.cipso != NULL) |
6b21e1b7 PM |
283 | return -EINVAL; |
284 | break; | |
285 | case NETLBL_NLTYPE_CIPSOV4: | |
6a8b7f0c | 286 | if (map4->def.cipso == NULL) |
6b21e1b7 PM |
287 | return -EINVAL; |
288 | break; | |
289 | default: | |
290 | return -EINVAL; | |
291 | } | |
292 | } | |
293 | #if IS_ENABLED(CONFIG_IPV6) | |
6a8b7f0c | 294 | netlbl_af6list_foreach(iter6, &entry->def.addrsel->list6) { |
6b21e1b7 | 295 | map6 = netlbl_domhsh_addr6_entry(iter6); |
6a8b7f0c | 296 | switch (map6->def.type) { |
6b21e1b7 PM |
297 | case NETLBL_NLTYPE_UNLABELED: |
298 | break; | |
299 | default: | |
300 | return -EINVAL; | |
301 | } | |
302 | } | |
303 | #endif /* IPv6 */ | |
304 | break; | |
305 | default: | |
306 | return -EINVAL; | |
307 | } | |
308 | ||
309 | return 0; | |
310 | } | |
311 | ||
d15c345f PM |
312 | /* |
313 | * Domain Hash Table Functions | |
314 | */ | |
315 | ||
316 | /** | |
317 | * netlbl_domhsh_init - Init for the domain hash | |
318 | * @size: the number of bits to use for the hash buckets | |
319 | * | |
320 | * Description: | |
321 | * Initializes the domain hash table, should be called only by | |
322 | * netlbl_user_init() during initialization. Returns zero on success, non-zero | |
323 | * values on error. | |
324 | * | |
325 | */ | |
05705e4e | 326 | int __init netlbl_domhsh_init(u32 size) |
d15c345f PM |
327 | { |
328 | u32 iter; | |
329 | struct netlbl_domhsh_tbl *hsh_tbl; | |
330 | ||
331 | if (size == 0) | |
332 | return -EINVAL; | |
333 | ||
334 | hsh_tbl = kmalloc(sizeof(*hsh_tbl), GFP_KERNEL); | |
335 | if (hsh_tbl == NULL) | |
336 | return -ENOMEM; | |
337 | hsh_tbl->size = 1 << size; | |
338 | hsh_tbl->tbl = kcalloc(hsh_tbl->size, | |
339 | sizeof(struct list_head), | |
340 | GFP_KERNEL); | |
341 | if (hsh_tbl->tbl == NULL) { | |
342 | kfree(hsh_tbl); | |
343 | return -ENOMEM; | |
344 | } | |
345 | for (iter = 0; iter < hsh_tbl->size; iter++) | |
346 | INIT_LIST_HEAD(&hsh_tbl->tbl[iter]); | |
347 | ||
d15c345f | 348 | spin_lock(&netlbl_domhsh_lock); |
cf778b00 | 349 | rcu_assign_pointer(netlbl_domhsh, hsh_tbl); |
d15c345f | 350 | spin_unlock(&netlbl_domhsh_lock); |
d15c345f PM |
351 | |
352 | return 0; | |
353 | } | |
354 | ||
355 | /** | |
356 | * netlbl_domhsh_add - Adds a entry to the domain hash table | |
357 | * @entry: the entry to add | |
95d4e6be | 358 | * @audit_info: NetLabel audit information |
d15c345f PM |
359 | * |
360 | * Description: | |
361 | * Adds a new entry to the domain hash table and handles any updates to the | |
362 | * lower level protocol handler (i.e. CIPSO). Returns zero on success, | |
363 | * negative on failure. | |
364 | * | |
365 | */ | |
95d4e6be PM |
366 | int netlbl_domhsh_add(struct netlbl_dom_map *entry, |
367 | struct netlbl_audit *audit_info) | |
d15c345f | 368 | { |
63c41688 PM |
369 | int ret_val = 0; |
370 | struct netlbl_dom_map *entry_old; | |
371 | struct netlbl_af4list *iter4; | |
372 | struct netlbl_af4list *tmp4; | |
dfd56b8b | 373 | #if IS_ENABLED(CONFIG_IPV6) |
63c41688 PM |
374 | struct netlbl_af6list *iter6; |
375 | struct netlbl_af6list *tmp6; | |
376 | #endif /* IPv6 */ | |
d15c345f | 377 | |
6b21e1b7 PM |
378 | ret_val = netlbl_domhsh_validate(entry); |
379 | if (ret_val != 0) | |
380 | return ret_val; | |
381 | ||
b914f3a2 PM |
382 | /* XXX - we can remove this RCU read lock as the spinlock protects the |
383 | * entire function, but before we do we need to fixup the | |
384 | * netlbl_af[4,6]list RCU functions to do "the right thing" with | |
385 | * respect to rcu_dereference() when only a spinlock is held. */ | |
d15c345f | 386 | rcu_read_lock(); |
1c3fad93 | 387 | spin_lock(&netlbl_domhsh_lock); |
63c41688 PM |
388 | if (entry->domain != NULL) |
389 | entry_old = netlbl_domhsh_search(entry->domain); | |
390 | else | |
391 | entry_old = netlbl_domhsh_search_def(entry->domain); | |
392 | if (entry_old == NULL) { | |
393 | entry->valid = 1; | |
63c41688 PM |
394 | |
395 | if (entry->domain != NULL) { | |
396 | u32 bkt = netlbl_domhsh_hash(entry->domain); | |
d15c345f | 397 | list_add_tail_rcu(&entry->list, |
3482fd90 | 398 | &rcu_dereference(netlbl_domhsh)->tbl[bkt]); |
63c41688 PM |
399 | } else { |
400 | INIT_LIST_HEAD(&entry->list); | |
cf778b00 | 401 | rcu_assign_pointer(netlbl_domhsh_def, entry); |
de64688f | 402 | } |
d15c345f | 403 | |
6a8b7f0c | 404 | if (entry->def.type == NETLBL_NLTYPE_ADDRSELECT) { |
63c41688 | 405 | netlbl_af4list_foreach_rcu(iter4, |
6a8b7f0c | 406 | &entry->def.addrsel->list4) |
63c41688 PM |
407 | netlbl_domhsh_audit_add(entry, iter4, NULL, |
408 | ret_val, audit_info); | |
dfd56b8b | 409 | #if IS_ENABLED(CONFIG_IPV6) |
63c41688 | 410 | netlbl_af6list_foreach_rcu(iter6, |
6a8b7f0c | 411 | &entry->def.addrsel->list6) |
63c41688 PM |
412 | netlbl_domhsh_audit_add(entry, NULL, iter6, |
413 | ret_val, audit_info); | |
414 | #endif /* IPv6 */ | |
415 | } else | |
416 | netlbl_domhsh_audit_add(entry, NULL, NULL, | |
417 | ret_val, audit_info); | |
6a8b7f0c PM |
418 | } else if (entry_old->def.type == NETLBL_NLTYPE_ADDRSELECT && |
419 | entry->def.type == NETLBL_NLTYPE_ADDRSELECT) { | |
63c41688 PM |
420 | struct list_head *old_list4; |
421 | struct list_head *old_list6; | |
422 | ||
6a8b7f0c PM |
423 | old_list4 = &entry_old->def.addrsel->list4; |
424 | old_list6 = &entry_old->def.addrsel->list6; | |
63c41688 PM |
425 | |
426 | /* we only allow the addition of address selectors if all of | |
427 | * the selectors do not exist in the existing domain map */ | |
6a8b7f0c | 428 | netlbl_af4list_foreach_rcu(iter4, &entry->def.addrsel->list4) |
63c41688 PM |
429 | if (netlbl_af4list_search_exact(iter4->addr, |
430 | iter4->mask, | |
431 | old_list4)) { | |
432 | ret_val = -EEXIST; | |
433 | goto add_return; | |
434 | } | |
dfd56b8b | 435 | #if IS_ENABLED(CONFIG_IPV6) |
6a8b7f0c | 436 | netlbl_af6list_foreach_rcu(iter6, &entry->def.addrsel->list6) |
63c41688 PM |
437 | if (netlbl_af6list_search_exact(&iter6->addr, |
438 | &iter6->mask, | |
439 | old_list6)) { | |
440 | ret_val = -EEXIST; | |
441 | goto add_return; | |
442 | } | |
443 | #endif /* IPv6 */ | |
444 | ||
445 | netlbl_af4list_foreach_safe(iter4, tmp4, | |
6a8b7f0c | 446 | &entry->def.addrsel->list4) { |
63c41688 PM |
447 | netlbl_af4list_remove_entry(iter4); |
448 | iter4->valid = 1; | |
449 | ret_val = netlbl_af4list_add(iter4, old_list4); | |
450 | netlbl_domhsh_audit_add(entry_old, iter4, NULL, | |
451 | ret_val, audit_info); | |
452 | if (ret_val != 0) | |
453 | goto add_return; | |
454 | } | |
dfd56b8b | 455 | #if IS_ENABLED(CONFIG_IPV6) |
63c41688 | 456 | netlbl_af6list_foreach_safe(iter6, tmp6, |
6a8b7f0c | 457 | &entry->def.addrsel->list6) { |
63c41688 PM |
458 | netlbl_af6list_remove_entry(iter6); |
459 | iter6->valid = 1; | |
460 | ret_val = netlbl_af6list_add(iter6, old_list6); | |
461 | netlbl_domhsh_audit_add(entry_old, NULL, iter6, | |
462 | ret_val, audit_info); | |
463 | if (ret_val != 0) | |
464 | goto add_return; | |
465 | } | |
466 | #endif /* IPv6 */ | |
467 | } else | |
468 | ret_val = -EINVAL; | |
469 | ||
470 | add_return: | |
471 | spin_unlock(&netlbl_domhsh_lock); | |
472 | rcu_read_unlock(); | |
d15c345f PM |
473 | return ret_val; |
474 | } | |
475 | ||
476 | /** | |
477 | * netlbl_domhsh_add_default - Adds the default entry to the domain hash table | |
478 | * @entry: the entry to add | |
95d4e6be | 479 | * @audit_info: NetLabel audit information |
d15c345f PM |
480 | * |
481 | * Description: | |
482 | * Adds a new default entry to the domain hash table and handles any updates | |
483 | * to the lower level protocol handler (i.e. CIPSO). Returns zero on success, | |
484 | * negative on failure. | |
485 | * | |
486 | */ | |
95d4e6be PM |
487 | int netlbl_domhsh_add_default(struct netlbl_dom_map *entry, |
488 | struct netlbl_audit *audit_info) | |
d15c345f | 489 | { |
95d4e6be | 490 | return netlbl_domhsh_add(entry, audit_info); |
d15c345f PM |
491 | } |
492 | ||
493 | /** | |
b1edeb10 PM |
494 | * netlbl_domhsh_remove_entry - Removes a given entry from the domain table |
495 | * @entry: the entry to remove | |
95d4e6be | 496 | * @audit_info: NetLabel audit information |
d15c345f PM |
497 | * |
498 | * Description: | |
499 | * Removes an entry from the domain hash table and handles any updates to the | |
b1edeb10 PM |
500 | * lower level protocol handler (i.e. CIPSO). Caller is responsible for |
501 | * ensuring that the RCU read lock is held. Returns zero on success, negative | |
502 | * on failure. | |
d15c345f PM |
503 | * |
504 | */ | |
b1edeb10 PM |
505 | int netlbl_domhsh_remove_entry(struct netlbl_dom_map *entry, |
506 | struct netlbl_audit *audit_info) | |
d15c345f | 507 | { |
b1edeb10 | 508 | int ret_val = 0; |
32f50cde | 509 | struct audit_buffer *audit_buf; |
d15c345f | 510 | |
d15c345f | 511 | if (entry == NULL) |
b1edeb10 PM |
512 | return -ENOENT; |
513 | ||
1c3fad93 PM |
514 | spin_lock(&netlbl_domhsh_lock); |
515 | if (entry->valid) { | |
516 | entry->valid = 0; | |
517 | if (entry != rcu_dereference(netlbl_domhsh_def)) | |
d15c345f | 518 | list_del_rcu(&entry->list); |
1c3fad93 | 519 | else |
a9b3cd7f | 520 | RCU_INIT_POINTER(netlbl_domhsh_def, NULL); |
b1edeb10 PM |
521 | } else |
522 | ret_val = -ENOENT; | |
1c3fad93 | 523 | spin_unlock(&netlbl_domhsh_lock); |
32f50cde | 524 | |
95d4e6be | 525 | audit_buf = netlbl_audit_start_common(AUDIT_MAC_MAP_DEL, audit_info); |
de64688f PM |
526 | if (audit_buf != NULL) { |
527 | audit_log_format(audit_buf, | |
528 | " nlbl_domain=%s res=%u", | |
529 | entry->domain ? entry->domain : "(default)", | |
530 | ret_val == 0 ? 1 : 0); | |
531 | audit_log_end(audit_buf); | |
532 | } | |
95d4e6be | 533 | |
b1edeb10 | 534 | if (ret_val == 0) { |
63c41688 PM |
535 | struct netlbl_af4list *iter4; |
536 | struct netlbl_domaddr4_map *map4; | |
537 | ||
6a8b7f0c | 538 | switch (entry->def.type) { |
63c41688 PM |
539 | case NETLBL_NLTYPE_ADDRSELECT: |
540 | netlbl_af4list_foreach_rcu(iter4, | |
6a8b7f0c | 541 | &entry->def.addrsel->list4) { |
63c41688 | 542 | map4 = netlbl_domhsh_addr4_entry(iter4); |
6a8b7f0c | 543 | cipso_v4_doi_putdef(map4->def.cipso); |
63c41688 PM |
544 | } |
545 | /* no need to check the IPv6 list since we currently | |
546 | * support only unlabeled protocols for IPv6 */ | |
547 | break; | |
b1edeb10 | 548 | case NETLBL_NLTYPE_CIPSOV4: |
6a8b7f0c | 549 | cipso_v4_doi_putdef(entry->def.cipso); |
b1edeb10 PM |
550 | break; |
551 | } | |
4be2700f | 552 | call_rcu(&entry->rcu, netlbl_domhsh_free_entry); |
b1edeb10 PM |
553 | } |
554 | ||
555 | return ret_val; | |
556 | } | |
557 | ||
6c2e8ac0 PM |
558 | /** |
559 | * netlbl_domhsh_remove_af4 - Removes an address selector entry | |
560 | * @domain: the domain | |
561 | * @addr: IPv4 address | |
562 | * @mask: IPv4 address mask | |
563 | * @audit_info: NetLabel audit information | |
564 | * | |
565 | * Description: | |
566 | * Removes an individual address selector from a domain mapping and potentially | |
567 | * the entire mapping if it is empty. Returns zero on success, negative values | |
568 | * on failure. | |
569 | * | |
570 | */ | |
571 | int netlbl_domhsh_remove_af4(const char *domain, | |
572 | const struct in_addr *addr, | |
573 | const struct in_addr *mask, | |
574 | struct netlbl_audit *audit_info) | |
575 | { | |
576 | struct netlbl_dom_map *entry_map; | |
577 | struct netlbl_af4list *entry_addr; | |
578 | struct netlbl_af4list *iter4; | |
dfd56b8b | 579 | #if IS_ENABLED(CONFIG_IPV6) |
6c2e8ac0 PM |
580 | struct netlbl_af6list *iter6; |
581 | #endif /* IPv6 */ | |
582 | struct netlbl_domaddr4_map *entry; | |
583 | ||
584 | rcu_read_lock(); | |
585 | ||
586 | if (domain) | |
587 | entry_map = netlbl_domhsh_search(domain); | |
588 | else | |
589 | entry_map = netlbl_domhsh_search_def(domain); | |
6a8b7f0c PM |
590 | if (entry_map == NULL || |
591 | entry_map->def.type != NETLBL_NLTYPE_ADDRSELECT) | |
6c2e8ac0 PM |
592 | goto remove_af4_failure; |
593 | ||
594 | spin_lock(&netlbl_domhsh_lock); | |
595 | entry_addr = netlbl_af4list_remove(addr->s_addr, mask->s_addr, | |
6a8b7f0c | 596 | &entry_map->def.addrsel->list4); |
6c2e8ac0 PM |
597 | spin_unlock(&netlbl_domhsh_lock); |
598 | ||
599 | if (entry_addr == NULL) | |
600 | goto remove_af4_failure; | |
6a8b7f0c | 601 | netlbl_af4list_foreach_rcu(iter4, &entry_map->def.addrsel->list4) |
6c2e8ac0 | 602 | goto remove_af4_single_addr; |
dfd56b8b | 603 | #if IS_ENABLED(CONFIG_IPV6) |
6a8b7f0c | 604 | netlbl_af6list_foreach_rcu(iter6, &entry_map->def.addrsel->list6) |
6c2e8ac0 PM |
605 | goto remove_af4_single_addr; |
606 | #endif /* IPv6 */ | |
607 | /* the domain mapping is empty so remove it from the mapping table */ | |
608 | netlbl_domhsh_remove_entry(entry_map, audit_info); | |
609 | ||
610 | remove_af4_single_addr: | |
611 | rcu_read_unlock(); | |
612 | /* yick, we can't use call_rcu here because we don't have a rcu head | |
613 | * pointer but hopefully this should be a rare case so the pause | |
614 | * shouldn't be a problem */ | |
615 | synchronize_rcu(); | |
616 | entry = netlbl_domhsh_addr4_entry(entry_addr); | |
6a8b7f0c | 617 | cipso_v4_doi_putdef(entry->def.cipso); |
6c2e8ac0 PM |
618 | kfree(entry); |
619 | return 0; | |
620 | ||
621 | remove_af4_failure: | |
622 | rcu_read_unlock(); | |
623 | return -ENOENT; | |
624 | } | |
625 | ||
b1edeb10 PM |
626 | /** |
627 | * netlbl_domhsh_remove - Removes an entry from the domain hash table | |
628 | * @domain: the domain to remove | |
629 | * @audit_info: NetLabel audit information | |
630 | * | |
631 | * Description: | |
632 | * Removes an entry from the domain hash table and handles any updates to the | |
633 | * lower level protocol handler (i.e. CIPSO). Returns zero on success, | |
634 | * negative on failure. | |
635 | * | |
636 | */ | |
637 | int netlbl_domhsh_remove(const char *domain, struct netlbl_audit *audit_info) | |
638 | { | |
639 | int ret_val; | |
640 | struct netlbl_dom_map *entry; | |
641 | ||
642 | rcu_read_lock(); | |
643 | if (domain) | |
644 | entry = netlbl_domhsh_search(domain); | |
645 | else | |
646 | entry = netlbl_domhsh_search_def(domain); | |
647 | ret_val = netlbl_domhsh_remove_entry(entry, audit_info); | |
648 | rcu_read_unlock(); | |
649 | ||
d15c345f PM |
650 | return ret_val; |
651 | } | |
652 | ||
653 | /** | |
654 | * netlbl_domhsh_remove_default - Removes the default entry from the table | |
95d4e6be | 655 | * @audit_info: NetLabel audit information |
d15c345f PM |
656 | * |
657 | * Description: | |
658 | * Removes/resets the default entry for the domain hash table and handles any | |
659 | * updates to the lower level protocol handler (i.e. CIPSO). Returns zero on | |
660 | * success, non-zero on failure. | |
661 | * | |
662 | */ | |
95d4e6be | 663 | int netlbl_domhsh_remove_default(struct netlbl_audit *audit_info) |
d15c345f | 664 | { |
95d4e6be | 665 | return netlbl_domhsh_remove(NULL, audit_info); |
d15c345f PM |
666 | } |
667 | ||
668 | /** | |
669 | * netlbl_domhsh_getentry - Get an entry from the domain hash table | |
670 | * @domain: the domain name to search for | |
671 | * | |
672 | * Description: | |
673 | * Look through the domain hash table searching for an entry to match @domain, | |
25985edc | 674 | * return a pointer to a copy of the entry or NULL. The caller is responsible |
d15c345f PM |
675 | * for ensuring that rcu_read_[un]lock() is called. |
676 | * | |
677 | */ | |
678 | struct netlbl_dom_map *netlbl_domhsh_getentry(const char *domain) | |
679 | { | |
b64397e0 | 680 | return netlbl_domhsh_search_def(domain); |
d15c345f PM |
681 | } |
682 | ||
63c41688 PM |
683 | /** |
684 | * netlbl_domhsh_getentry_af4 - Get an entry from the domain hash table | |
685 | * @domain: the domain name to search for | |
686 | * @addr: the IP address to search for | |
687 | * | |
688 | * Description: | |
689 | * Look through the domain hash table searching for an entry to match @domain | |
690 | * and @addr, return a pointer to a copy of the entry or NULL. The caller is | |
691 | * responsible for ensuring that rcu_read_[un]lock() is called. | |
692 | * | |
693 | */ | |
6a8b7f0c PM |
694 | struct netlbl_dommap_def *netlbl_domhsh_getentry_af4(const char *domain, |
695 | __be32 addr) | |
63c41688 PM |
696 | { |
697 | struct netlbl_dom_map *dom_iter; | |
698 | struct netlbl_af4list *addr_iter; | |
699 | ||
700 | dom_iter = netlbl_domhsh_search_def(domain); | |
701 | if (dom_iter == NULL) | |
702 | return NULL; | |
63c41688 | 703 | |
6a8b7f0c PM |
704 | if (dom_iter->def.type != NETLBL_NLTYPE_ADDRSELECT) |
705 | return &dom_iter->def; | |
706 | addr_iter = netlbl_af4list_search(addr, &dom_iter->def.addrsel->list4); | |
63c41688 PM |
707 | if (addr_iter == NULL) |
708 | return NULL; | |
6a8b7f0c | 709 | return &(netlbl_domhsh_addr4_entry(addr_iter)->def); |
63c41688 PM |
710 | } |
711 | ||
dfd56b8b | 712 | #if IS_ENABLED(CONFIG_IPV6) |
63c41688 PM |
713 | /** |
714 | * netlbl_domhsh_getentry_af6 - Get an entry from the domain hash table | |
715 | * @domain: the domain name to search for | |
716 | * @addr: the IP address to search for | |
717 | * | |
718 | * Description: | |
719 | * Look through the domain hash table searching for an entry to match @domain | |
720 | * and @addr, return a pointer to a copy of the entry or NULL. The caller is | |
721 | * responsible for ensuring that rcu_read_[un]lock() is called. | |
722 | * | |
723 | */ | |
6a8b7f0c | 724 | struct netlbl_dommap_def *netlbl_domhsh_getentry_af6(const char *domain, |
63c41688 PM |
725 | const struct in6_addr *addr) |
726 | { | |
727 | struct netlbl_dom_map *dom_iter; | |
728 | struct netlbl_af6list *addr_iter; | |
729 | ||
730 | dom_iter = netlbl_domhsh_search_def(domain); | |
731 | if (dom_iter == NULL) | |
732 | return NULL; | |
63c41688 | 733 | |
6a8b7f0c PM |
734 | if (dom_iter->def.type != NETLBL_NLTYPE_ADDRSELECT) |
735 | return &dom_iter->def; | |
736 | addr_iter = netlbl_af6list_search(addr, &dom_iter->def.addrsel->list6); | |
63c41688 PM |
737 | if (addr_iter == NULL) |
738 | return NULL; | |
6a8b7f0c | 739 | return &(netlbl_domhsh_addr6_entry(addr_iter)->def); |
63c41688 PM |
740 | } |
741 | #endif /* IPv6 */ | |
742 | ||
d15c345f | 743 | /** |
fcd48280 PM |
744 | * netlbl_domhsh_walk - Iterate through the domain mapping hash table |
745 | * @skip_bkt: the number of buckets to skip at the start | |
746 | * @skip_chain: the number of entries to skip in the first iterated bucket | |
747 | * @callback: callback for each entry | |
748 | * @cb_arg: argument for the callback function | |
d15c345f PM |
749 | * |
750 | * Description: | |
fcd48280 PM |
751 | * Interate over the domain mapping hash table, skipping the first @skip_bkt |
752 | * buckets and @skip_chain entries. For each entry in the table call | |
753 | * @callback, if @callback returns a negative value stop 'walking' through the | |
754 | * table and return. Updates the values in @skip_bkt and @skip_chain on | |
af901ca1 | 755 | * return. Returns zero on success, negative values on failure. |
d15c345f PM |
756 | * |
757 | */ | |
fcd48280 PM |
758 | int netlbl_domhsh_walk(u32 *skip_bkt, |
759 | u32 *skip_chain, | |
760 | int (*callback) (struct netlbl_dom_map *entry, void *arg), | |
761 | void *cb_arg) | |
d15c345f | 762 | { |
fcd48280 PM |
763 | int ret_val = -ENOENT; |
764 | u32 iter_bkt; | |
56196701 | 765 | struct list_head *iter_list; |
fcd48280 PM |
766 | struct netlbl_dom_map *iter_entry; |
767 | u32 chain_cnt = 0; | |
d15c345f | 768 | |
d15c345f | 769 | rcu_read_lock(); |
fcd48280 PM |
770 | for (iter_bkt = *skip_bkt; |
771 | iter_bkt < rcu_dereference(netlbl_domhsh)->size; | |
772 | iter_bkt++, chain_cnt = 0) { | |
56196701 PM |
773 | iter_list = &rcu_dereference(netlbl_domhsh)->tbl[iter_bkt]; |
774 | list_for_each_entry_rcu(iter_entry, iter_list, list) | |
fcd48280 PM |
775 | if (iter_entry->valid) { |
776 | if (chain_cnt++ < *skip_chain) | |
777 | continue; | |
778 | ret_val = callback(iter_entry, cb_arg); | |
779 | if (ret_val < 0) { | |
780 | chain_cnt--; | |
781 | goto walk_return; | |
782 | } | |
d15c345f | 783 | } |
fcd48280 | 784 | } |
d15c345f | 785 | |
fcd48280 | 786 | walk_return: |
d15c345f | 787 | rcu_read_unlock(); |
fcd48280 PM |
788 | *skip_bkt = iter_bkt; |
789 | *skip_chain = chain_cnt; | |
790 | return ret_val; | |
d15c345f | 791 | } |