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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@paul-moore.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, see <http://www.gnu.org/licenses/>. | |
28 | * | |
29 | */ | |
30 | ||
31 | #include <linux/types.h> | |
32 | #include <linux/rculist.h> | |
33 | #include <linux/skbuff.h> | |
34 | #include <linux/spinlock.h> | |
35 | #include <linux/string.h> | |
36 | #include <linux/audit.h> | |
37 | #include <linux/slab.h> | |
38 | #include <net/netlabel.h> | |
39 | #include <net/cipso_ipv4.h> | |
40 | #include <net/calipso.h> | |
41 | #include <asm/bug.h> | |
42 | ||
43 | #include "netlabel_mgmt.h" | |
44 | #include "netlabel_addrlist.h" | |
45 | #include "netlabel_calipso.h" | |
46 | #include "netlabel_domainhash.h" | |
47 | #include "netlabel_user.h" | |
48 | ||
49 | struct netlbl_domhsh_tbl { | |
50 | struct list_head *tbl; | |
51 | u32 size; | |
52 | }; | |
53 | ||
54 | /* Domain hash table */ | |
55 | /* updates should be so rare that having one spinlock for the entire hash table | |
56 | * should be okay */ | |
57 | static DEFINE_SPINLOCK(netlbl_domhsh_lock); | |
58 | #define netlbl_domhsh_rcu_deref(p) \ | |
59 | rcu_dereference_check(p, lockdep_is_held(&netlbl_domhsh_lock)) | |
60 | static struct netlbl_domhsh_tbl __rcu *netlbl_domhsh; | |
61 | static struct netlbl_dom_map __rcu *netlbl_domhsh_def_ipv4; | |
62 | static struct netlbl_dom_map __rcu *netlbl_domhsh_def_ipv6; | |
63 | ||
64 | /* | |
65 | * Domain Hash Table Helper Functions | |
66 | */ | |
67 | ||
68 | /** | |
69 | * netlbl_domhsh_free_entry - Frees a domain hash table entry | |
70 | * @entry: the entry's RCU field | |
71 | * | |
72 | * Description: | |
73 | * This function is designed to be used as a callback to the call_rcu() | |
74 | * function so that the memory allocated to a hash table entry can be released | |
75 | * safely. | |
76 | * | |
77 | */ | |
78 | static void netlbl_domhsh_free_entry(struct rcu_head *entry) | |
79 | { | |
80 | struct netlbl_dom_map *ptr; | |
81 | struct netlbl_af4list *iter4; | |
82 | struct netlbl_af4list *tmp4; | |
83 | #if IS_ENABLED(CONFIG_IPV6) | |
84 | struct netlbl_af6list *iter6; | |
85 | struct netlbl_af6list *tmp6; | |
86 | #endif /* IPv6 */ | |
87 | ||
88 | ptr = container_of(entry, struct netlbl_dom_map, rcu); | |
89 | if (ptr->def.type == NETLBL_NLTYPE_ADDRSELECT) { | |
90 | netlbl_af4list_foreach_safe(iter4, tmp4, | |
91 | &ptr->def.addrsel->list4) { | |
92 | netlbl_af4list_remove_entry(iter4); | |
93 | kfree(netlbl_domhsh_addr4_entry(iter4)); | |
94 | } | |
95 | #if IS_ENABLED(CONFIG_IPV6) | |
96 | netlbl_af6list_foreach_safe(iter6, tmp6, | |
97 | &ptr->def.addrsel->list6) { | |
98 | netlbl_af6list_remove_entry(iter6); | |
99 | kfree(netlbl_domhsh_addr6_entry(iter6)); | |
100 | } | |
101 | #endif /* IPv6 */ | |
102 | } | |
103 | kfree(ptr->domain); | |
104 | kfree(ptr); | |
105 | } | |
106 | ||
107 | /** | |
108 | * netlbl_domhsh_hash - Hashing function for the domain hash table | |
109 | * @domain: the domain name to hash | |
110 | * | |
111 | * Description: | |
112 | * This is the hashing function for the domain hash table, it returns the | |
113 | * correct bucket number for the domain. The caller is responsible for | |
114 | * ensuring that the hash table is protected with either a RCU read lock or the | |
115 | * hash table lock. | |
116 | * | |
117 | */ | |
118 | static u32 netlbl_domhsh_hash(const char *key) | |
119 | { | |
120 | u32 iter; | |
121 | u32 val; | |
122 | u32 len; | |
123 | ||
124 | /* This is taken (with slight modification) from | |
125 | * security/selinux/ss/symtab.c:symhash() */ | |
126 | ||
127 | for (iter = 0, val = 0, len = strlen(key); iter < len; iter++) | |
128 | val = (val << 4 | (val >> (8 * sizeof(u32) - 4))) ^ key[iter]; | |
129 | return val & (netlbl_domhsh_rcu_deref(netlbl_domhsh)->size - 1); | |
130 | } | |
131 | ||
132 | static bool netlbl_family_match(u16 f1, u16 f2) | |
133 | { | |
134 | return (f1 == f2) || (f1 == AF_UNSPEC) || (f2 == AF_UNSPEC); | |
135 | } | |
136 | ||
137 | /** | |
138 | * netlbl_domhsh_search - Search for a domain entry | |
139 | * @domain: the domain | |
140 | * @family: the address family | |
141 | * | |
142 | * Description: | |
143 | * Searches the domain hash table and returns a pointer to the hash table | |
144 | * entry if found, otherwise NULL is returned. @family may be %AF_UNSPEC | |
145 | * which matches any address family entries. The caller is responsible for | |
146 | * ensuring that the hash table is protected with either a RCU read lock or the | |
147 | * hash table lock. | |
148 | * | |
149 | */ | |
150 | static struct netlbl_dom_map *netlbl_domhsh_search(const char *domain, | |
151 | u16 family) | |
152 | { | |
153 | u32 bkt; | |
154 | struct list_head *bkt_list; | |
155 | struct netlbl_dom_map *iter; | |
156 | ||
157 | if (domain != NULL) { | |
158 | bkt = netlbl_domhsh_hash(domain); | |
159 | bkt_list = &netlbl_domhsh_rcu_deref(netlbl_domhsh)->tbl[bkt]; | |
160 | list_for_each_entry_rcu(iter, bkt_list, list) | |
161 | if (iter->valid && | |
162 | netlbl_family_match(iter->family, family) && | |
163 | strcmp(iter->domain, domain) == 0) | |
164 | return iter; | |
165 | } | |
166 | ||
167 | return NULL; | |
168 | } | |
169 | ||
170 | /** | |
171 | * netlbl_domhsh_search_def - Search for a domain entry | |
172 | * @domain: the domain | |
173 | * @family: the address family | |
174 | * | |
175 | * Description: | |
176 | * Searches the domain hash table and returns a pointer to the hash table | |
177 | * entry if an exact match is found, if an exact match is not present in the | |
178 | * hash table then the default entry is returned if valid otherwise NULL is | |
179 | * returned. @family may be %AF_UNSPEC which matches any address family | |
180 | * entries. The caller is responsible ensuring that the hash table is | |
181 | * protected with either a RCU read lock or the hash table lock. | |
182 | * | |
183 | */ | |
184 | static struct netlbl_dom_map *netlbl_domhsh_search_def(const char *domain, | |
185 | u16 family) | |
186 | { | |
187 | struct netlbl_dom_map *entry; | |
188 | ||
189 | entry = netlbl_domhsh_search(domain, family); | |
190 | if (entry != NULL) | |
191 | return entry; | |
192 | if (family == AF_INET || family == AF_UNSPEC) { | |
193 | entry = netlbl_domhsh_rcu_deref(netlbl_domhsh_def_ipv4); | |
194 | if (entry != NULL && entry->valid) | |
195 | return entry; | |
196 | } | |
197 | if (family == AF_INET6 || family == AF_UNSPEC) { | |
198 | entry = netlbl_domhsh_rcu_deref(netlbl_domhsh_def_ipv6); | |
199 | if (entry != NULL && entry->valid) | |
200 | return entry; | |
201 | } | |
202 | ||
203 | return NULL; | |
204 | } | |
205 | ||
206 | /** | |
207 | * netlbl_domhsh_audit_add - Generate an audit entry for an add event | |
208 | * @entry: the entry being added | |
209 | * @addr4: the IPv4 address information | |
210 | * @addr6: the IPv6 address information | |
211 | * @result: the result code | |
212 | * @audit_info: NetLabel audit information | |
213 | * | |
214 | * Description: | |
215 | * Generate an audit record for adding a new NetLabel/LSM mapping entry with | |
216 | * the given information. Caller is responsible for holding the necessary | |
217 | * locks. | |
218 | * | |
219 | */ | |
220 | static void netlbl_domhsh_audit_add(struct netlbl_dom_map *entry, | |
221 | struct netlbl_af4list *addr4, | |
222 | struct netlbl_af6list *addr6, | |
223 | int result, | |
224 | struct netlbl_audit *audit_info) | |
225 | { | |
226 | struct audit_buffer *audit_buf; | |
227 | struct cipso_v4_doi *cipsov4 = NULL; | |
228 | struct calipso_doi *calipso = NULL; | |
229 | u32 type; | |
230 | ||
231 | audit_buf = netlbl_audit_start_common(AUDIT_MAC_MAP_ADD, audit_info); | |
232 | if (audit_buf != NULL) { | |
233 | audit_log_format(audit_buf, " nlbl_domain=%s", | |
234 | entry->domain ? entry->domain : "(default)"); | |
235 | if (addr4 != NULL) { | |
236 | struct netlbl_domaddr4_map *map4; | |
237 | map4 = netlbl_domhsh_addr4_entry(addr4); | |
238 | type = map4->def.type; | |
239 | cipsov4 = map4->def.cipso; | |
240 | netlbl_af4list_audit_addr(audit_buf, 0, NULL, | |
241 | addr4->addr, addr4->mask); | |
242 | #if IS_ENABLED(CONFIG_IPV6) | |
243 | } else if (addr6 != NULL) { | |
244 | struct netlbl_domaddr6_map *map6; | |
245 | map6 = netlbl_domhsh_addr6_entry(addr6); | |
246 | type = map6->def.type; | |
247 | calipso = map6->def.calipso; | |
248 | netlbl_af6list_audit_addr(audit_buf, 0, NULL, | |
249 | &addr6->addr, &addr6->mask); | |
250 | #endif /* IPv6 */ | |
251 | } else { | |
252 | type = entry->def.type; | |
253 | cipsov4 = entry->def.cipso; | |
254 | calipso = entry->def.calipso; | |
255 | } | |
256 | switch (type) { | |
257 | case NETLBL_NLTYPE_UNLABELED: | |
258 | audit_log_format(audit_buf, " nlbl_protocol=unlbl"); | |
259 | break; | |
260 | case NETLBL_NLTYPE_CIPSOV4: | |
261 | BUG_ON(cipsov4 == NULL); | |
262 | audit_log_format(audit_buf, | |
263 | " nlbl_protocol=cipsov4 cipso_doi=%u", | |
264 | cipsov4->doi); | |
265 | break; | |
266 | case NETLBL_NLTYPE_CALIPSO: | |
267 | BUG_ON(calipso == NULL); | |
268 | audit_log_format(audit_buf, | |
269 | " nlbl_protocol=calipso calipso_doi=%u", | |
270 | calipso->doi); | |
271 | break; | |
272 | } | |
273 | audit_log_format(audit_buf, " res=%u", result == 0 ? 1 : 0); | |
274 | audit_log_end(audit_buf); | |
275 | } | |
276 | } | |
277 | ||
278 | /** | |
279 | * netlbl_domhsh_validate - Validate a new domain mapping entry | |
280 | * @entry: the entry to validate | |
281 | * | |
282 | * This function validates the new domain mapping entry to ensure that it is | |
283 | * a valid entry. Returns zero on success, negative values on failure. | |
284 | * | |
285 | */ | |
286 | static int netlbl_domhsh_validate(const struct netlbl_dom_map *entry) | |
287 | { | |
288 | struct netlbl_af4list *iter4; | |
289 | struct netlbl_domaddr4_map *map4; | |
290 | #if IS_ENABLED(CONFIG_IPV6) | |
291 | struct netlbl_af6list *iter6; | |
292 | struct netlbl_domaddr6_map *map6; | |
293 | #endif /* IPv6 */ | |
294 | ||
295 | if (entry == NULL) | |
296 | return -EINVAL; | |
297 | ||
298 | if (entry->family != AF_INET && entry->family != AF_INET6 && | |
299 | (entry->family != AF_UNSPEC || | |
300 | entry->def.type != NETLBL_NLTYPE_UNLABELED)) | |
301 | return -EINVAL; | |
302 | ||
303 | switch (entry->def.type) { | |
304 | case NETLBL_NLTYPE_UNLABELED: | |
305 | if (entry->def.cipso != NULL || entry->def.calipso != NULL || | |
306 | entry->def.addrsel != NULL) | |
307 | return -EINVAL; | |
308 | break; | |
309 | case NETLBL_NLTYPE_CIPSOV4: | |
310 | if (entry->family != AF_INET || | |
311 | entry->def.cipso == NULL) | |
312 | return -EINVAL; | |
313 | break; | |
314 | case NETLBL_NLTYPE_CALIPSO: | |
315 | if (entry->family != AF_INET6 || | |
316 | entry->def.calipso == NULL) | |
317 | return -EINVAL; | |
318 | break; | |
319 | case NETLBL_NLTYPE_ADDRSELECT: | |
320 | netlbl_af4list_foreach(iter4, &entry->def.addrsel->list4) { | |
321 | map4 = netlbl_domhsh_addr4_entry(iter4); | |
322 | switch (map4->def.type) { | |
323 | case NETLBL_NLTYPE_UNLABELED: | |
324 | if (map4->def.cipso != NULL) | |
325 | return -EINVAL; | |
326 | break; | |
327 | case NETLBL_NLTYPE_CIPSOV4: | |
328 | if (map4->def.cipso == NULL) | |
329 | return -EINVAL; | |
330 | break; | |
331 | default: | |
332 | return -EINVAL; | |
333 | } | |
334 | } | |
335 | #if IS_ENABLED(CONFIG_IPV6) | |
336 | netlbl_af6list_foreach(iter6, &entry->def.addrsel->list6) { | |
337 | map6 = netlbl_domhsh_addr6_entry(iter6); | |
338 | switch (map6->def.type) { | |
339 | case NETLBL_NLTYPE_UNLABELED: | |
340 | if (map6->def.calipso != NULL) | |
341 | return -EINVAL; | |
342 | break; | |
343 | case NETLBL_NLTYPE_CALIPSO: | |
344 | if (map6->def.calipso == NULL) | |
345 | return -EINVAL; | |
346 | break; | |
347 | default: | |
348 | return -EINVAL; | |
349 | } | |
350 | } | |
351 | #endif /* IPv6 */ | |
352 | break; | |
353 | default: | |
354 | return -EINVAL; | |
355 | } | |
356 | ||
357 | return 0; | |
358 | } | |
359 | ||
360 | /* | |
361 | * Domain Hash Table Functions | |
362 | */ | |
363 | ||
364 | /** | |
365 | * netlbl_domhsh_init - Init for the domain hash | |
366 | * @size: the number of bits to use for the hash buckets | |
367 | * | |
368 | * Description: | |
369 | * Initializes the domain hash table, should be called only by | |
370 | * netlbl_user_init() during initialization. Returns zero on success, non-zero | |
371 | * values on error. | |
372 | * | |
373 | */ | |
374 | int __init netlbl_domhsh_init(u32 size) | |
375 | { | |
376 | u32 iter; | |
377 | struct netlbl_domhsh_tbl *hsh_tbl; | |
378 | ||
379 | if (size == 0) | |
380 | return -EINVAL; | |
381 | ||
382 | hsh_tbl = kmalloc(sizeof(*hsh_tbl), GFP_KERNEL); | |
383 | if (hsh_tbl == NULL) | |
384 | return -ENOMEM; | |
385 | hsh_tbl->size = 1 << size; | |
386 | hsh_tbl->tbl = kcalloc(hsh_tbl->size, | |
387 | sizeof(struct list_head), | |
388 | GFP_KERNEL); | |
389 | if (hsh_tbl->tbl == NULL) { | |
390 | kfree(hsh_tbl); | |
391 | return -ENOMEM; | |
392 | } | |
393 | for (iter = 0; iter < hsh_tbl->size; iter++) | |
394 | INIT_LIST_HEAD(&hsh_tbl->tbl[iter]); | |
395 | ||
396 | spin_lock(&netlbl_domhsh_lock); | |
397 | rcu_assign_pointer(netlbl_domhsh, hsh_tbl); | |
398 | spin_unlock(&netlbl_domhsh_lock); | |
399 | ||
400 | return 0; | |
401 | } | |
402 | ||
403 | /** | |
404 | * netlbl_domhsh_add - Adds a entry to the domain hash table | |
405 | * @entry: the entry to add | |
406 | * @audit_info: NetLabel audit information | |
407 | * | |
408 | * Description: | |
409 | * Adds a new entry to the domain hash table and handles any updates to the | |
410 | * lower level protocol handler (i.e. CIPSO). @entry->family may be set to | |
411 | * %AF_UNSPEC which will add an entry that matches all address families. This | |
412 | * is only useful for the unlabelled type and will only succeed if there is no | |
413 | * existing entry for any address family with the same domain. Returns zero | |
414 | * on success, negative on failure. | |
415 | * | |
416 | */ | |
417 | int netlbl_domhsh_add(struct netlbl_dom_map *entry, | |
418 | struct netlbl_audit *audit_info) | |
419 | { | |
420 | int ret_val = 0; | |
421 | struct netlbl_dom_map *entry_old, *entry_b; | |
422 | struct netlbl_af4list *iter4; | |
423 | struct netlbl_af4list *tmp4; | |
424 | #if IS_ENABLED(CONFIG_IPV6) | |
425 | struct netlbl_af6list *iter6; | |
426 | struct netlbl_af6list *tmp6; | |
427 | #endif /* IPv6 */ | |
428 | ||
429 | ret_val = netlbl_domhsh_validate(entry); | |
430 | if (ret_val != 0) | |
431 | return ret_val; | |
432 | ||
433 | /* XXX - we can remove this RCU read lock as the spinlock protects the | |
434 | * entire function, but before we do we need to fixup the | |
435 | * netlbl_af[4,6]list RCU functions to do "the right thing" with | |
436 | * respect to rcu_dereference() when only a spinlock is held. */ | |
437 | rcu_read_lock(); | |
438 | spin_lock(&netlbl_domhsh_lock); | |
439 | if (entry->domain != NULL) | |
440 | entry_old = netlbl_domhsh_search(entry->domain, entry->family); | |
441 | else | |
442 | entry_old = netlbl_domhsh_search_def(entry->domain, | |
443 | entry->family); | |
444 | if (entry_old == NULL) { | |
445 | entry->valid = 1; | |
446 | ||
447 | if (entry->domain != NULL) { | |
448 | u32 bkt = netlbl_domhsh_hash(entry->domain); | |
449 | list_add_tail_rcu(&entry->list, | |
450 | &rcu_dereference(netlbl_domhsh)->tbl[bkt]); | |
451 | } else { | |
452 | INIT_LIST_HEAD(&entry->list); | |
453 | switch (entry->family) { | |
454 | case AF_INET: | |
455 | rcu_assign_pointer(netlbl_domhsh_def_ipv4, | |
456 | entry); | |
457 | break; | |
458 | case AF_INET6: | |
459 | rcu_assign_pointer(netlbl_domhsh_def_ipv6, | |
460 | entry); | |
461 | break; | |
462 | case AF_UNSPEC: | |
463 | if (entry->def.type != | |
464 | NETLBL_NLTYPE_UNLABELED) { | |
465 | ret_val = -EINVAL; | |
466 | goto add_return; | |
467 | } | |
468 | entry_b = kzalloc(sizeof(*entry_b), GFP_ATOMIC); | |
469 | if (entry_b == NULL) { | |
470 | ret_val = -ENOMEM; | |
471 | goto add_return; | |
472 | } | |
473 | entry_b->family = AF_INET6; | |
474 | entry_b->def.type = NETLBL_NLTYPE_UNLABELED; | |
475 | entry_b->valid = 1; | |
476 | entry->family = AF_INET; | |
477 | rcu_assign_pointer(netlbl_domhsh_def_ipv4, | |
478 | entry); | |
479 | rcu_assign_pointer(netlbl_domhsh_def_ipv6, | |
480 | entry_b); | |
481 | break; | |
482 | default: | |
483 | /* Already checked in | |
484 | * netlbl_domhsh_validate(). */ | |
485 | ret_val = -EINVAL; | |
486 | goto add_return; | |
487 | } | |
488 | } | |
489 | ||
490 | if (entry->def.type == NETLBL_NLTYPE_ADDRSELECT) { | |
491 | netlbl_af4list_foreach_rcu(iter4, | |
492 | &entry->def.addrsel->list4) | |
493 | netlbl_domhsh_audit_add(entry, iter4, NULL, | |
494 | ret_val, audit_info); | |
495 | #if IS_ENABLED(CONFIG_IPV6) | |
496 | netlbl_af6list_foreach_rcu(iter6, | |
497 | &entry->def.addrsel->list6) | |
498 | netlbl_domhsh_audit_add(entry, NULL, iter6, | |
499 | ret_val, audit_info); | |
500 | #endif /* IPv6 */ | |
501 | } else | |
502 | netlbl_domhsh_audit_add(entry, NULL, NULL, | |
503 | ret_val, audit_info); | |
504 | } else if (entry_old->def.type == NETLBL_NLTYPE_ADDRSELECT && | |
505 | entry->def.type == NETLBL_NLTYPE_ADDRSELECT) { | |
506 | struct list_head *old_list4; | |
507 | struct list_head *old_list6; | |
508 | ||
509 | old_list4 = &entry_old->def.addrsel->list4; | |
510 | old_list6 = &entry_old->def.addrsel->list6; | |
511 | ||
512 | /* we only allow the addition of address selectors if all of | |
513 | * the selectors do not exist in the existing domain map */ | |
514 | netlbl_af4list_foreach_rcu(iter4, &entry->def.addrsel->list4) | |
515 | if (netlbl_af4list_search_exact(iter4->addr, | |
516 | iter4->mask, | |
517 | old_list4)) { | |
518 | ret_val = -EEXIST; | |
519 | goto add_return; | |
520 | } | |
521 | #if IS_ENABLED(CONFIG_IPV6) | |
522 | netlbl_af6list_foreach_rcu(iter6, &entry->def.addrsel->list6) | |
523 | if (netlbl_af6list_search_exact(&iter6->addr, | |
524 | &iter6->mask, | |
525 | old_list6)) { | |
526 | ret_val = -EEXIST; | |
527 | goto add_return; | |
528 | } | |
529 | #endif /* IPv6 */ | |
530 | ||
531 | netlbl_af4list_foreach_safe(iter4, tmp4, | |
532 | &entry->def.addrsel->list4) { | |
533 | netlbl_af4list_remove_entry(iter4); | |
534 | iter4->valid = 1; | |
535 | ret_val = netlbl_af4list_add(iter4, old_list4); | |
536 | netlbl_domhsh_audit_add(entry_old, iter4, NULL, | |
537 | ret_val, audit_info); | |
538 | if (ret_val != 0) | |
539 | goto add_return; | |
540 | } | |
541 | #if IS_ENABLED(CONFIG_IPV6) | |
542 | netlbl_af6list_foreach_safe(iter6, tmp6, | |
543 | &entry->def.addrsel->list6) { | |
544 | netlbl_af6list_remove_entry(iter6); | |
545 | iter6->valid = 1; | |
546 | ret_val = netlbl_af6list_add(iter6, old_list6); | |
547 | netlbl_domhsh_audit_add(entry_old, NULL, iter6, | |
548 | ret_val, audit_info); | |
549 | if (ret_val != 0) | |
550 | goto add_return; | |
551 | } | |
552 | #endif /* IPv6 */ | |
553 | } else | |
554 | ret_val = -EINVAL; | |
555 | ||
556 | add_return: | |
557 | spin_unlock(&netlbl_domhsh_lock); | |
558 | rcu_read_unlock(); | |
559 | return ret_val; | |
560 | } | |
561 | ||
562 | /** | |
563 | * netlbl_domhsh_add_default - Adds the default entry to the domain hash table | |
564 | * @entry: the entry to add | |
565 | * @audit_info: NetLabel audit information | |
566 | * | |
567 | * Description: | |
568 | * Adds a new default entry to the domain hash table and handles any updates | |
569 | * to the lower level protocol handler (i.e. CIPSO). Returns zero on success, | |
570 | * negative on failure. | |
571 | * | |
572 | */ | |
573 | int netlbl_domhsh_add_default(struct netlbl_dom_map *entry, | |
574 | struct netlbl_audit *audit_info) | |
575 | { | |
576 | return netlbl_domhsh_add(entry, audit_info); | |
577 | } | |
578 | ||
579 | /** | |
580 | * netlbl_domhsh_remove_entry - Removes a given entry from the domain table | |
581 | * @entry: the entry to remove | |
582 | * @audit_info: NetLabel audit information | |
583 | * | |
584 | * Description: | |
585 | * Removes an entry from the domain hash table and handles any updates to the | |
586 | * lower level protocol handler (i.e. CIPSO). Caller is responsible for | |
587 | * ensuring that the RCU read lock is held. Returns zero on success, negative | |
588 | * on failure. | |
589 | * | |
590 | */ | |
591 | int netlbl_domhsh_remove_entry(struct netlbl_dom_map *entry, | |
592 | struct netlbl_audit *audit_info) | |
593 | { | |
594 | int ret_val = 0; | |
595 | struct audit_buffer *audit_buf; | |
596 | ||
597 | if (entry == NULL) | |
598 | return -ENOENT; | |
599 | ||
600 | spin_lock(&netlbl_domhsh_lock); | |
601 | if (entry->valid) { | |
602 | entry->valid = 0; | |
603 | if (entry == rcu_dereference(netlbl_domhsh_def_ipv4)) | |
604 | RCU_INIT_POINTER(netlbl_domhsh_def_ipv4, NULL); | |
605 | else if (entry == rcu_dereference(netlbl_domhsh_def_ipv6)) | |
606 | RCU_INIT_POINTER(netlbl_domhsh_def_ipv6, NULL); | |
607 | else | |
608 | list_del_rcu(&entry->list); | |
609 | } else | |
610 | ret_val = -ENOENT; | |
611 | spin_unlock(&netlbl_domhsh_lock); | |
612 | ||
613 | audit_buf = netlbl_audit_start_common(AUDIT_MAC_MAP_DEL, audit_info); | |
614 | if (audit_buf != NULL) { | |
615 | audit_log_format(audit_buf, | |
616 | " nlbl_domain=%s res=%u", | |
617 | entry->domain ? entry->domain : "(default)", | |
618 | ret_val == 0 ? 1 : 0); | |
619 | audit_log_end(audit_buf); | |
620 | } | |
621 | ||
622 | if (ret_val == 0) { | |
623 | struct netlbl_af4list *iter4; | |
624 | struct netlbl_domaddr4_map *map4; | |
625 | #if IS_ENABLED(CONFIG_IPV6) | |
626 | struct netlbl_af6list *iter6; | |
627 | struct netlbl_domaddr6_map *map6; | |
628 | #endif /* IPv6 */ | |
629 | ||
630 | switch (entry->def.type) { | |
631 | case NETLBL_NLTYPE_ADDRSELECT: | |
632 | netlbl_af4list_foreach_rcu(iter4, | |
633 | &entry->def.addrsel->list4) { | |
634 | map4 = netlbl_domhsh_addr4_entry(iter4); | |
635 | cipso_v4_doi_putdef(map4->def.cipso); | |
636 | } | |
637 | #if IS_ENABLED(CONFIG_IPV6) | |
638 | netlbl_af6list_foreach_rcu(iter6, | |
639 | &entry->def.addrsel->list6) { | |
640 | map6 = netlbl_domhsh_addr6_entry(iter6); | |
641 | calipso_doi_putdef(map6->def.calipso); | |
642 | } | |
643 | #endif /* IPv6 */ | |
644 | break; | |
645 | case NETLBL_NLTYPE_CIPSOV4: | |
646 | cipso_v4_doi_putdef(entry->def.cipso); | |
647 | break; | |
648 | #if IS_ENABLED(CONFIG_IPV6) | |
649 | case NETLBL_NLTYPE_CALIPSO: | |
650 | calipso_doi_putdef(entry->def.calipso); | |
651 | break; | |
652 | #endif /* IPv6 */ | |
653 | } | |
654 | call_rcu(&entry->rcu, netlbl_domhsh_free_entry); | |
655 | } | |
656 | ||
657 | return ret_val; | |
658 | } | |
659 | ||
660 | /** | |
661 | * netlbl_domhsh_remove_af4 - Removes an address selector entry | |
662 | * @domain: the domain | |
663 | * @addr: IPv4 address | |
664 | * @mask: IPv4 address mask | |
665 | * @audit_info: NetLabel audit information | |
666 | * | |
667 | * Description: | |
668 | * Removes an individual address selector from a domain mapping and potentially | |
669 | * the entire mapping if it is empty. Returns zero on success, negative values | |
670 | * on failure. | |
671 | * | |
672 | */ | |
673 | int netlbl_domhsh_remove_af4(const char *domain, | |
674 | const struct in_addr *addr, | |
675 | const struct in_addr *mask, | |
676 | struct netlbl_audit *audit_info) | |
677 | { | |
678 | struct netlbl_dom_map *entry_map; | |
679 | struct netlbl_af4list *entry_addr; | |
680 | struct netlbl_af4list *iter4; | |
681 | #if IS_ENABLED(CONFIG_IPV6) | |
682 | struct netlbl_af6list *iter6; | |
683 | #endif /* IPv6 */ | |
684 | struct netlbl_domaddr4_map *entry; | |
685 | ||
686 | rcu_read_lock(); | |
687 | ||
688 | if (domain) | |
689 | entry_map = netlbl_domhsh_search(domain, AF_INET); | |
690 | else | |
691 | entry_map = netlbl_domhsh_search_def(domain, AF_INET); | |
692 | if (entry_map == NULL || | |
693 | entry_map->def.type != NETLBL_NLTYPE_ADDRSELECT) | |
694 | goto remove_af4_failure; | |
695 | ||
696 | spin_lock(&netlbl_domhsh_lock); | |
697 | entry_addr = netlbl_af4list_remove(addr->s_addr, mask->s_addr, | |
698 | &entry_map->def.addrsel->list4); | |
699 | spin_unlock(&netlbl_domhsh_lock); | |
700 | ||
701 | if (entry_addr == NULL) | |
702 | goto remove_af4_failure; | |
703 | netlbl_af4list_foreach_rcu(iter4, &entry_map->def.addrsel->list4) | |
704 | goto remove_af4_single_addr; | |
705 | #if IS_ENABLED(CONFIG_IPV6) | |
706 | netlbl_af6list_foreach_rcu(iter6, &entry_map->def.addrsel->list6) | |
707 | goto remove_af4_single_addr; | |
708 | #endif /* IPv6 */ | |
709 | /* the domain mapping is empty so remove it from the mapping table */ | |
710 | netlbl_domhsh_remove_entry(entry_map, audit_info); | |
711 | ||
712 | remove_af4_single_addr: | |
713 | rcu_read_unlock(); | |
714 | /* yick, we can't use call_rcu here because we don't have a rcu head | |
715 | * pointer but hopefully this should be a rare case so the pause | |
716 | * shouldn't be a problem */ | |
717 | synchronize_rcu(); | |
718 | entry = netlbl_domhsh_addr4_entry(entry_addr); | |
719 | cipso_v4_doi_putdef(entry->def.cipso); | |
720 | kfree(entry); | |
721 | return 0; | |
722 | ||
723 | remove_af4_failure: | |
724 | rcu_read_unlock(); | |
725 | return -ENOENT; | |
726 | } | |
727 | ||
728 | #if IS_ENABLED(CONFIG_IPV6) | |
729 | /** | |
730 | * netlbl_domhsh_remove_af6 - Removes an address selector entry | |
731 | * @domain: the domain | |
732 | * @addr: IPv6 address | |
733 | * @mask: IPv6 address mask | |
734 | * @audit_info: NetLabel audit information | |
735 | * | |
736 | * Description: | |
737 | * Removes an individual address selector from a domain mapping and potentially | |
738 | * the entire mapping if it is empty. Returns zero on success, negative values | |
739 | * on failure. | |
740 | * | |
741 | */ | |
742 | int netlbl_domhsh_remove_af6(const char *domain, | |
743 | const struct in6_addr *addr, | |
744 | const struct in6_addr *mask, | |
745 | struct netlbl_audit *audit_info) | |
746 | { | |
747 | struct netlbl_dom_map *entry_map; | |
748 | struct netlbl_af6list *entry_addr; | |
749 | struct netlbl_af4list *iter4; | |
750 | struct netlbl_af6list *iter6; | |
751 | struct netlbl_domaddr6_map *entry; | |
752 | ||
753 | rcu_read_lock(); | |
754 | ||
755 | if (domain) | |
756 | entry_map = netlbl_domhsh_search(domain, AF_INET6); | |
757 | else | |
758 | entry_map = netlbl_domhsh_search_def(domain, AF_INET6); | |
759 | if (entry_map == NULL || | |
760 | entry_map->def.type != NETLBL_NLTYPE_ADDRSELECT) | |
761 | goto remove_af6_failure; | |
762 | ||
763 | spin_lock(&netlbl_domhsh_lock); | |
764 | entry_addr = netlbl_af6list_remove(addr, mask, | |
765 | &entry_map->def.addrsel->list6); | |
766 | spin_unlock(&netlbl_domhsh_lock); | |
767 | ||
768 | if (entry_addr == NULL) | |
769 | goto remove_af6_failure; | |
770 | netlbl_af4list_foreach_rcu(iter4, &entry_map->def.addrsel->list4) | |
771 | goto remove_af6_single_addr; | |
772 | netlbl_af6list_foreach_rcu(iter6, &entry_map->def.addrsel->list6) | |
773 | goto remove_af6_single_addr; | |
774 | /* the domain mapping is empty so remove it from the mapping table */ | |
775 | netlbl_domhsh_remove_entry(entry_map, audit_info); | |
776 | ||
777 | remove_af6_single_addr: | |
778 | rcu_read_unlock(); | |
779 | /* yick, we can't use call_rcu here because we don't have a rcu head | |
780 | * pointer but hopefully this should be a rare case so the pause | |
781 | * shouldn't be a problem */ | |
782 | synchronize_rcu(); | |
783 | entry = netlbl_domhsh_addr6_entry(entry_addr); | |
784 | calipso_doi_putdef(entry->def.calipso); | |
785 | kfree(entry); | |
786 | return 0; | |
787 | ||
788 | remove_af6_failure: | |
789 | rcu_read_unlock(); | |
790 | return -ENOENT; | |
791 | } | |
792 | #endif /* IPv6 */ | |
793 | ||
794 | /** | |
795 | * netlbl_domhsh_remove - Removes an entry from the domain hash table | |
796 | * @domain: the domain to remove | |
797 | * @family: address family | |
798 | * @audit_info: NetLabel audit information | |
799 | * | |
800 | * Description: | |
801 | * Removes an entry from the domain hash table and handles any updates to the | |
802 | * lower level protocol handler (i.e. CIPSO). @family may be %AF_UNSPEC which | |
803 | * removes all address family entries. Returns zero on success, negative on | |
804 | * failure. | |
805 | * | |
806 | */ | |
807 | int netlbl_domhsh_remove(const char *domain, u16 family, | |
808 | struct netlbl_audit *audit_info) | |
809 | { | |
810 | int ret_val = -EINVAL; | |
811 | struct netlbl_dom_map *entry; | |
812 | ||
813 | rcu_read_lock(); | |
814 | ||
815 | if (family == AF_INET || family == AF_UNSPEC) { | |
816 | if (domain) | |
817 | entry = netlbl_domhsh_search(domain, AF_INET); | |
818 | else | |
819 | entry = netlbl_domhsh_search_def(domain, AF_INET); | |
820 | ret_val = netlbl_domhsh_remove_entry(entry, audit_info); | |
821 | if (ret_val && ret_val != -ENOENT) | |
822 | goto done; | |
823 | } | |
824 | if (family == AF_INET6 || family == AF_UNSPEC) { | |
825 | int ret_val2; | |
826 | ||
827 | if (domain) | |
828 | entry = netlbl_domhsh_search(domain, AF_INET6); | |
829 | else | |
830 | entry = netlbl_domhsh_search_def(domain, AF_INET6); | |
831 | ret_val2 = netlbl_domhsh_remove_entry(entry, audit_info); | |
832 | if (ret_val2 != -ENOENT) | |
833 | ret_val = ret_val2; | |
834 | } | |
835 | done: | |
836 | rcu_read_unlock(); | |
837 | ||
838 | return ret_val; | |
839 | } | |
840 | ||
841 | /** | |
842 | * netlbl_domhsh_remove_default - Removes the default entry from the table | |
843 | * @family: address family | |
844 | * @audit_info: NetLabel audit information | |
845 | * | |
846 | * Description: | |
847 | * Removes/resets the default entry corresponding to @family from the domain | |
848 | * hash table and handles any updates to the lower level protocol handler | |
849 | * (i.e. CIPSO). @family may be %AF_UNSPEC which removes all address family | |
850 | * entries. Returns zero on success, negative on failure. | |
851 | * | |
852 | */ | |
853 | int netlbl_domhsh_remove_default(u16 family, struct netlbl_audit *audit_info) | |
854 | { | |
855 | return netlbl_domhsh_remove(NULL, family, audit_info); | |
856 | } | |
857 | ||
858 | /** | |
859 | * netlbl_domhsh_getentry - Get an entry from the domain hash table | |
860 | * @domain: the domain name to search for | |
861 | * @family: address family | |
862 | * | |
863 | * Description: | |
864 | * Look through the domain hash table searching for an entry to match @domain, | |
865 | * with address family @family, return a pointer to a copy of the entry or | |
866 | * NULL. The caller is responsible for ensuring that rcu_read_[un]lock() is | |
867 | * called. | |
868 | * | |
869 | */ | |
870 | struct netlbl_dom_map *netlbl_domhsh_getentry(const char *domain, u16 family) | |
871 | { | |
872 | if (family == AF_UNSPEC) | |
873 | return NULL; | |
874 | return netlbl_domhsh_search_def(domain, family); | |
875 | } | |
876 | ||
877 | /** | |
878 | * netlbl_domhsh_getentry_af4 - Get an entry from the domain hash table | |
879 | * @domain: the domain name to search for | |
880 | * @addr: the IP address to search for | |
881 | * | |
882 | * Description: | |
883 | * Look through the domain hash table searching for an entry to match @domain | |
884 | * and @addr, return a pointer to a copy of the entry or NULL. The caller is | |
885 | * responsible for ensuring that rcu_read_[un]lock() is called. | |
886 | * | |
887 | */ | |
888 | struct netlbl_dommap_def *netlbl_domhsh_getentry_af4(const char *domain, | |
889 | __be32 addr) | |
890 | { | |
891 | struct netlbl_dom_map *dom_iter; | |
892 | struct netlbl_af4list *addr_iter; | |
893 | ||
894 | dom_iter = netlbl_domhsh_search_def(domain, AF_INET); | |
895 | if (dom_iter == NULL) | |
896 | return NULL; | |
897 | ||
898 | if (dom_iter->def.type != NETLBL_NLTYPE_ADDRSELECT) | |
899 | return &dom_iter->def; | |
900 | addr_iter = netlbl_af4list_search(addr, &dom_iter->def.addrsel->list4); | |
901 | if (addr_iter == NULL) | |
902 | return NULL; | |
903 | return &(netlbl_domhsh_addr4_entry(addr_iter)->def); | |
904 | } | |
905 | ||
906 | #if IS_ENABLED(CONFIG_IPV6) | |
907 | /** | |
908 | * netlbl_domhsh_getentry_af6 - Get an entry from the domain hash table | |
909 | * @domain: the domain name to search for | |
910 | * @addr: the IP address to search for | |
911 | * | |
912 | * Description: | |
913 | * Look through the domain hash table searching for an entry to match @domain | |
914 | * and @addr, return a pointer to a copy of the entry or NULL. The caller is | |
915 | * responsible for ensuring that rcu_read_[un]lock() is called. | |
916 | * | |
917 | */ | |
918 | struct netlbl_dommap_def *netlbl_domhsh_getentry_af6(const char *domain, | |
919 | const struct in6_addr *addr) | |
920 | { | |
921 | struct netlbl_dom_map *dom_iter; | |
922 | struct netlbl_af6list *addr_iter; | |
923 | ||
924 | dom_iter = netlbl_domhsh_search_def(domain, AF_INET6); | |
925 | if (dom_iter == NULL) | |
926 | return NULL; | |
927 | ||
928 | if (dom_iter->def.type != NETLBL_NLTYPE_ADDRSELECT) | |
929 | return &dom_iter->def; | |
930 | addr_iter = netlbl_af6list_search(addr, &dom_iter->def.addrsel->list6); | |
931 | if (addr_iter == NULL) | |
932 | return NULL; | |
933 | return &(netlbl_domhsh_addr6_entry(addr_iter)->def); | |
934 | } | |
935 | #endif /* IPv6 */ | |
936 | ||
937 | /** | |
938 | * netlbl_domhsh_walk - Iterate through the domain mapping hash table | |
939 | * @skip_bkt: the number of buckets to skip at the start | |
940 | * @skip_chain: the number of entries to skip in the first iterated bucket | |
941 | * @callback: callback for each entry | |
942 | * @cb_arg: argument for the callback function | |
943 | * | |
944 | * Description: | |
945 | * Interate over the domain mapping hash table, skipping the first @skip_bkt | |
946 | * buckets and @skip_chain entries. For each entry in the table call | |
947 | * @callback, if @callback returns a negative value stop 'walking' through the | |
948 | * table and return. Updates the values in @skip_bkt and @skip_chain on | |
949 | * return. Returns zero on success, negative values on failure. | |
950 | * | |
951 | */ | |
952 | int netlbl_domhsh_walk(u32 *skip_bkt, | |
953 | u32 *skip_chain, | |
954 | int (*callback) (struct netlbl_dom_map *entry, void *arg), | |
955 | void *cb_arg) | |
956 | { | |
957 | int ret_val = -ENOENT; | |
958 | u32 iter_bkt; | |
959 | struct list_head *iter_list; | |
960 | struct netlbl_dom_map *iter_entry; | |
961 | u32 chain_cnt = 0; | |
962 | ||
963 | rcu_read_lock(); | |
964 | for (iter_bkt = *skip_bkt; | |
965 | iter_bkt < rcu_dereference(netlbl_domhsh)->size; | |
966 | iter_bkt++, chain_cnt = 0) { | |
967 | iter_list = &rcu_dereference(netlbl_domhsh)->tbl[iter_bkt]; | |
968 | list_for_each_entry_rcu(iter_entry, iter_list, list) | |
969 | if (iter_entry->valid) { | |
970 | if (chain_cnt++ < *skip_chain) | |
971 | continue; | |
972 | ret_val = callback(iter_entry, cb_arg); | |
973 | if (ret_val < 0) { | |
974 | chain_cnt--; | |
975 | goto walk_return; | |
976 | } | |
977 | } | |
978 | } | |
979 | ||
980 | walk_return: | |
981 | rcu_read_unlock(); | |
982 | *skip_bkt = iter_bkt; | |
983 | *skip_chain = chain_cnt; | |
984 | return ret_val; | |
985 | } |