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d15c345f PM |
1 | /* |
2 | * NetLabel Kernel API | |
3 | * | |
4 | * This file defines the kernel API for the NetLabel system. The NetLabel | |
5 | * system manages static and dynamic label mappings for network protocols such | |
6 | * as CIPSO and RIPSO. | |
7 | * | |
8 | * Author: Paul Moore <paul.moore@hp.com> | |
9 | * | |
10 | */ | |
11 | ||
12 | /* | |
13 | * (c) Copyright Hewlett-Packard Development Company, L.P., 2006 | |
14 | * | |
15 | * This program is free software; you can redistribute it and/or modify | |
16 | * it under the terms of the GNU General Public License as published by | |
17 | * the Free Software Foundation; either version 2 of the License, or | |
18 | * (at your option) any later version. | |
19 | * | |
20 | * This program is distributed in the hope that it will be useful, | |
21 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
22 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
23 | * the GNU General Public License for more details. | |
24 | * | |
25 | * You should have received a copy of the GNU General Public License | |
26 | * along with this program; if not, write to the Free Software | |
27 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
28 | * | |
29 | */ | |
30 | ||
31 | #include <linux/init.h> | |
32 | #include <linux/types.h> | |
eda61d32 | 33 | #include <linux/audit.h> |
d15c345f PM |
34 | #include <net/ip.h> |
35 | #include <net/netlabel.h> | |
36 | #include <net/cipso_ipv4.h> | |
37 | #include <asm/bug.h> | |
c783f1ce | 38 | #include <asm/atomic.h> |
d15c345f PM |
39 | |
40 | #include "netlabel_domainhash.h" | |
41 | #include "netlabel_unlabeled.h" | |
eda61d32 | 42 | #include "netlabel_cipso_v4.h" |
d15c345f | 43 | #include "netlabel_user.h" |
23bcdc1a | 44 | #include "netlabel_mgmt.h" |
d15c345f | 45 | |
eda61d32 PM |
46 | /* |
47 | * Configuration Functions | |
48 | */ | |
49 | ||
50 | /** | |
51 | * netlbl_cfg_map_del - Remove a NetLabel/LSM domain mapping | |
52 | * @domain: the domain mapping to remove | |
53 | * @audit_info: NetLabel audit information | |
54 | * | |
55 | * Description: | |
56 | * Removes a NetLabel/LSM domain mapping. A @domain value of NULL causes the | |
57 | * default domain mapping to be removed. Returns zero on success, negative | |
58 | * values on failure. | |
59 | * | |
60 | */ | |
61 | int netlbl_cfg_map_del(const char *domain, struct netlbl_audit *audit_info) | |
62 | { | |
63 | return netlbl_domhsh_remove(domain, audit_info); | |
64 | } | |
65 | ||
66 | /** | |
67 | * netlbl_cfg_unlbl_add_map - Add an unlabeled NetLabel/LSM domain mapping | |
68 | * @domain: the domain mapping to add | |
69 | * @audit_info: NetLabel audit information | |
70 | * | |
71 | * Description: | |
72 | * Adds a new unlabeled NetLabel/LSM domain mapping. A @domain value of NULL | |
73 | * causes a new default domain mapping to be added. Returns zero on success, | |
74 | * negative values on failure. | |
75 | * | |
76 | */ | |
77 | int netlbl_cfg_unlbl_add_map(const char *domain, | |
78 | struct netlbl_audit *audit_info) | |
79 | { | |
80 | int ret_val = -ENOMEM; | |
81 | struct netlbl_dom_map *entry; | |
82 | ||
83 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); | |
84 | if (entry == NULL) | |
85 | goto cfg_unlbl_add_map_failure; | |
86 | if (domain != NULL) { | |
87 | entry->domain = kstrdup(domain, GFP_ATOMIC); | |
88 | if (entry->domain == NULL) | |
89 | goto cfg_unlbl_add_map_failure; | |
90 | } | |
91 | entry->type = NETLBL_NLTYPE_UNLABELED; | |
92 | ||
93 | ret_val = netlbl_domhsh_add(entry, audit_info); | |
94 | if (ret_val != 0) | |
95 | goto cfg_unlbl_add_map_failure; | |
96 | ||
97 | return 0; | |
98 | ||
99 | cfg_unlbl_add_map_failure: | |
100 | if (entry != NULL) | |
101 | kfree(entry->domain); | |
102 | kfree(entry); | |
103 | return ret_val; | |
104 | } | |
105 | ||
106 | /** | |
107 | * netlbl_cfg_cipsov4_add - Add a new CIPSOv4 DOI definition | |
108 | * @doi_def: the DOI definition | |
109 | * @audit_info: NetLabel audit information | |
110 | * | |
111 | * Description: | |
112 | * Add a new CIPSOv4 DOI definition to the NetLabel subsystem. Returns zero on | |
113 | * success, negative values on failure. | |
114 | * | |
115 | */ | |
116 | int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def, | |
117 | struct netlbl_audit *audit_info) | |
118 | { | |
119 | int ret_val; | |
120 | const char *type_str; | |
121 | struct audit_buffer *audit_buf; | |
122 | ||
123 | ret_val = cipso_v4_doi_add(doi_def); | |
124 | ||
125 | audit_buf = netlbl_audit_start_common(AUDIT_MAC_CIPSOV4_ADD, | |
126 | audit_info); | |
127 | if (audit_buf != NULL) { | |
128 | switch (doi_def->type) { | |
129 | case CIPSO_V4_MAP_STD: | |
130 | type_str = "std"; | |
131 | break; | |
132 | case CIPSO_V4_MAP_PASS: | |
133 | type_str = "pass"; | |
134 | break; | |
135 | default: | |
136 | type_str = "(unknown)"; | |
137 | } | |
138 | audit_log_format(audit_buf, | |
139 | " cipso_doi=%u cipso_type=%s res=%u", | |
140 | doi_def->doi, | |
141 | type_str, | |
142 | ret_val == 0 ? 1 : 0); | |
143 | audit_log_end(audit_buf); | |
144 | } | |
145 | ||
146 | return ret_val; | |
147 | } | |
148 | ||
149 | /** | |
150 | * netlbl_cfg_cipsov4_add_map - Add a new CIPSOv4 DOI definition and mapping | |
151 | * @doi_def: the DOI definition | |
152 | * @domain: the domain mapping to add | |
153 | * @audit_info: NetLabel audit information | |
154 | * | |
155 | * Description: | |
156 | * Add a new CIPSOv4 DOI definition and NetLabel/LSM domain mapping for this | |
157 | * new DOI definition to the NetLabel subsystem. A @domain value of NULL adds | |
158 | * a new default domain mapping. Returns zero on success, negative values on | |
159 | * failure. | |
160 | * | |
161 | */ | |
162 | int netlbl_cfg_cipsov4_add_map(struct cipso_v4_doi *doi_def, | |
163 | const char *domain, | |
164 | struct netlbl_audit *audit_info) | |
165 | { | |
166 | int ret_val = -ENOMEM; | |
167 | struct netlbl_dom_map *entry; | |
168 | ||
169 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); | |
170 | if (entry == NULL) | |
171 | goto cfg_cipsov4_add_map_failure; | |
172 | if (domain != NULL) { | |
173 | entry->domain = kstrdup(domain, GFP_ATOMIC); | |
174 | if (entry->domain == NULL) | |
175 | goto cfg_cipsov4_add_map_failure; | |
176 | } | |
177 | entry->type = NETLBL_NLTYPE_CIPSOV4; | |
178 | entry->type_def.cipsov4 = doi_def; | |
179 | ||
180 | /* Grab a RCU read lock here so nothing happens to the doi_def variable | |
181 | * between adding it to the CIPSOv4 protocol engine and adding a | |
182 | * domain mapping for it. */ | |
183 | ||
184 | rcu_read_lock(); | |
185 | ret_val = netlbl_cfg_cipsov4_add(doi_def, audit_info); | |
186 | if (ret_val != 0) | |
187 | goto cfg_cipsov4_add_map_failure_unlock; | |
188 | ret_val = netlbl_domhsh_add(entry, audit_info); | |
189 | if (ret_val != 0) | |
190 | goto cfg_cipsov4_add_map_failure_remove_doi; | |
191 | rcu_read_unlock(); | |
192 | ||
193 | return 0; | |
194 | ||
195 | cfg_cipsov4_add_map_failure_remove_doi: | |
196 | cipso_v4_doi_remove(doi_def->doi, audit_info, netlbl_cipsov4_doi_free); | |
197 | cfg_cipsov4_add_map_failure_unlock: | |
198 | rcu_read_unlock(); | |
199 | cfg_cipsov4_add_map_failure: | |
200 | if (entry != NULL) | |
201 | kfree(entry->domain); | |
202 | kfree(entry); | |
203 | return ret_val; | |
204 | } | |
205 | ||
206 | /** | |
207 | * netlbl_cfg_cipsov4_del - Removean existing CIPSOv4 DOI definition | |
208 | * @doi: the CIPSO DOI value | |
209 | * @audit_info: NetLabel audit information | |
210 | * | |
211 | * Description: | |
212 | * Removes an existing CIPSOv4 DOI definition from the NetLabel subsystem. | |
213 | * Returns zero on success, negative values on failure. | |
214 | * | |
215 | */ | |
216 | int netlbl_cfg_cipsov4_del(u32 doi, struct netlbl_audit *audit_info) | |
217 | { | |
218 | return cipso_v4_doi_remove(doi, audit_info, netlbl_cipsov4_doi_free); | |
219 | } | |
220 | ||
02752760 PM |
221 | /* |
222 | * Security Attribute Functions | |
223 | */ | |
224 | ||
225 | /** | |
226 | * netlbl_secattr_catmap_walk - Walk a LSM secattr catmap looking for a bit | |
227 | * @catmap: the category bitmap | |
228 | * @offset: the offset to start searching at, in bits | |
229 | * | |
230 | * Description: | |
231 | * This function walks a LSM secattr category bitmap starting at @offset and | |
232 | * returns the spot of the first set bit or -ENOENT if no bits are set. | |
233 | * | |
234 | */ | |
235 | int netlbl_secattr_catmap_walk(struct netlbl_lsm_secattr_catmap *catmap, | |
236 | u32 offset) | |
237 | { | |
238 | struct netlbl_lsm_secattr_catmap *iter = catmap; | |
239 | u32 node_idx; | |
240 | u32 node_bit; | |
241 | NETLBL_CATMAP_MAPTYPE bitmap; | |
242 | ||
243 | if (offset > iter->startbit) { | |
244 | while (offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) { | |
245 | iter = iter->next; | |
246 | if (iter == NULL) | |
247 | return -ENOENT; | |
248 | } | |
249 | node_idx = (offset - iter->startbit) / NETLBL_CATMAP_MAPSIZE; | |
250 | node_bit = offset - iter->startbit - | |
251 | (NETLBL_CATMAP_MAPSIZE * node_idx); | |
252 | } else { | |
253 | node_idx = 0; | |
254 | node_bit = 0; | |
255 | } | |
256 | bitmap = iter->bitmap[node_idx] >> node_bit; | |
257 | ||
258 | for (;;) { | |
259 | if (bitmap != 0) { | |
260 | while ((bitmap & NETLBL_CATMAP_BIT) == 0) { | |
261 | bitmap >>= 1; | |
262 | node_bit++; | |
263 | } | |
264 | return iter->startbit + | |
265 | (NETLBL_CATMAP_MAPSIZE * node_idx) + node_bit; | |
266 | } | |
267 | if (++node_idx >= NETLBL_CATMAP_MAPCNT) { | |
268 | if (iter->next != NULL) { | |
269 | iter = iter->next; | |
270 | node_idx = 0; | |
271 | } else | |
272 | return -ENOENT; | |
273 | } | |
274 | bitmap = iter->bitmap[node_idx]; | |
275 | node_bit = 0; | |
276 | } | |
277 | ||
278 | return -ENOENT; | |
279 | } | |
280 | ||
281 | /** | |
282 | * netlbl_secattr_catmap_walk_rng - Find the end of a string of set bits | |
283 | * @catmap: the category bitmap | |
284 | * @offset: the offset to start searching at, in bits | |
285 | * | |
286 | * Description: | |
287 | * This function walks a LSM secattr category bitmap starting at @offset and | |
288 | * returns the spot of the first cleared bit or -ENOENT if the offset is past | |
289 | * the end of the bitmap. | |
290 | * | |
291 | */ | |
292 | int netlbl_secattr_catmap_walk_rng(struct netlbl_lsm_secattr_catmap *catmap, | |
293 | u32 offset) | |
294 | { | |
295 | struct netlbl_lsm_secattr_catmap *iter = catmap; | |
296 | u32 node_idx; | |
297 | u32 node_bit; | |
298 | NETLBL_CATMAP_MAPTYPE bitmask; | |
299 | NETLBL_CATMAP_MAPTYPE bitmap; | |
300 | ||
301 | if (offset > iter->startbit) { | |
302 | while (offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) { | |
303 | iter = iter->next; | |
304 | if (iter == NULL) | |
305 | return -ENOENT; | |
306 | } | |
307 | node_idx = (offset - iter->startbit) / NETLBL_CATMAP_MAPSIZE; | |
308 | node_bit = offset - iter->startbit - | |
309 | (NETLBL_CATMAP_MAPSIZE * node_idx); | |
310 | } else { | |
311 | node_idx = 0; | |
312 | node_bit = 0; | |
313 | } | |
314 | bitmask = NETLBL_CATMAP_BIT << node_bit; | |
315 | ||
316 | for (;;) { | |
317 | bitmap = iter->bitmap[node_idx]; | |
318 | while (bitmask != 0 && (bitmap & bitmask) != 0) { | |
319 | bitmask <<= 1; | |
320 | node_bit++; | |
321 | } | |
322 | ||
323 | if (bitmask != 0) | |
324 | return iter->startbit + | |
325 | (NETLBL_CATMAP_MAPSIZE * node_idx) + | |
326 | node_bit - 1; | |
327 | else if (++node_idx >= NETLBL_CATMAP_MAPCNT) { | |
328 | if (iter->next == NULL) | |
329 | return iter->startbit + NETLBL_CATMAP_SIZE - 1; | |
330 | iter = iter->next; | |
331 | node_idx = 0; | |
332 | } | |
333 | bitmask = NETLBL_CATMAP_BIT; | |
334 | node_bit = 0; | |
335 | } | |
336 | ||
337 | return -ENOENT; | |
338 | } | |
339 | ||
340 | /** | |
341 | * netlbl_secattr_catmap_setbit - Set a bit in a LSM secattr catmap | |
342 | * @catmap: the category bitmap | |
343 | * @bit: the bit to set | |
344 | * @flags: memory allocation flags | |
345 | * | |
346 | * Description: | |
347 | * Set the bit specified by @bit in @catmap. Returns zero on success, | |
348 | * negative values on failure. | |
349 | * | |
350 | */ | |
351 | int netlbl_secattr_catmap_setbit(struct netlbl_lsm_secattr_catmap *catmap, | |
352 | u32 bit, | |
353 | gfp_t flags) | |
354 | { | |
355 | struct netlbl_lsm_secattr_catmap *iter = catmap; | |
356 | u32 node_bit; | |
357 | u32 node_idx; | |
358 | ||
359 | while (iter->next != NULL && | |
360 | bit >= (iter->startbit + NETLBL_CATMAP_SIZE)) | |
361 | iter = iter->next; | |
362 | if (bit >= (iter->startbit + NETLBL_CATMAP_SIZE)) { | |
363 | iter->next = netlbl_secattr_catmap_alloc(flags); | |
364 | if (iter->next == NULL) | |
365 | return -ENOMEM; | |
366 | iter = iter->next; | |
367 | iter->startbit = bit & ~(NETLBL_CATMAP_SIZE - 1); | |
368 | } | |
369 | ||
370 | /* gcc always rounds to zero when doing integer division */ | |
371 | node_idx = (bit - iter->startbit) / NETLBL_CATMAP_MAPSIZE; | |
372 | node_bit = bit - iter->startbit - (NETLBL_CATMAP_MAPSIZE * node_idx); | |
373 | iter->bitmap[node_idx] |= NETLBL_CATMAP_BIT << node_bit; | |
374 | ||
375 | return 0; | |
376 | } | |
377 | ||
378 | /** | |
379 | * netlbl_secattr_catmap_setrng - Set a range of bits in a LSM secattr catmap | |
380 | * @catmap: the category bitmap | |
381 | * @start: the starting bit | |
382 | * @end: the last bit in the string | |
383 | * @flags: memory allocation flags | |
384 | * | |
385 | * Description: | |
386 | * Set a range of bits, starting at @start and ending with @end. Returns zero | |
387 | * on success, negative values on failure. | |
388 | * | |
389 | */ | |
390 | int netlbl_secattr_catmap_setrng(struct netlbl_lsm_secattr_catmap *catmap, | |
391 | u32 start, | |
392 | u32 end, | |
393 | gfp_t flags) | |
394 | { | |
395 | int ret_val = 0; | |
396 | struct netlbl_lsm_secattr_catmap *iter = catmap; | |
397 | u32 iter_max_spot; | |
398 | u32 spot; | |
399 | ||
400 | /* XXX - This could probably be made a bit faster by combining writes | |
401 | * to the catmap instead of setting a single bit each time, but for | |
402 | * right now skipping to the start of the range in the catmap should | |
403 | * be a nice improvement over calling the individual setbit function | |
404 | * repeatedly from a loop. */ | |
405 | ||
406 | while (iter->next != NULL && | |
407 | start >= (iter->startbit + NETLBL_CATMAP_SIZE)) | |
408 | iter = iter->next; | |
409 | iter_max_spot = iter->startbit + NETLBL_CATMAP_SIZE; | |
410 | ||
411 | for (spot = start; spot <= end && ret_val == 0; spot++) { | |
412 | if (spot >= iter_max_spot && iter->next != NULL) { | |
413 | iter = iter->next; | |
414 | iter_max_spot = iter->startbit + NETLBL_CATMAP_SIZE; | |
415 | } | |
416 | ret_val = netlbl_secattr_catmap_setbit(iter, spot, GFP_ATOMIC); | |
417 | } | |
418 | ||
419 | return ret_val; | |
420 | } | |
421 | ||
d15c345f PM |
422 | /* |
423 | * LSM Functions | |
424 | */ | |
425 | ||
23bcdc1a PM |
426 | /** |
427 | * netlbl_enabled - Determine if the NetLabel subsystem is enabled | |
428 | * | |
429 | * Description: | |
430 | * The LSM can use this function to determine if it should use NetLabel | |
431 | * security attributes in it's enforcement mechanism. Currently, NetLabel is | |
432 | * considered to be enabled when it's configuration contains a valid setup for | |
433 | * at least one labeled protocol (i.e. NetLabel can understand incoming | |
434 | * labeled packets of at least one type); otherwise NetLabel is considered to | |
435 | * be disabled. | |
436 | * | |
437 | */ | |
438 | int netlbl_enabled(void) | |
439 | { | |
440 | /* At some point we probably want to expose this mechanism to the user | |
441 | * as well so that admins can toggle NetLabel regardless of the | |
442 | * configuration */ | |
c783f1ce | 443 | return (atomic_read(&netlabel_mgmt_protocount) > 0); |
23bcdc1a PM |
444 | } |
445 | ||
d15c345f PM |
446 | /** |
447 | * netlbl_socket_setattr - Label a socket using the correct protocol | |
ba6ff9f2 | 448 | * @sk: the socket to label |
d15c345f PM |
449 | * @secattr: the security attributes |
450 | * | |
451 | * Description: | |
452 | * Attach the correct label to the given socket using the security attributes | |
ba6ff9f2 PM |
453 | * specified in @secattr. This function requires exclusive access to @sk, |
454 | * which means it either needs to be in the process of being created or locked. | |
455 | * Returns zero on success, negative values on failure. | |
d15c345f PM |
456 | * |
457 | */ | |
ba6ff9f2 PM |
458 | int netlbl_sock_setattr(struct sock *sk, |
459 | const struct netlbl_lsm_secattr *secattr) | |
d15c345f PM |
460 | { |
461 | int ret_val = -ENOENT; | |
462 | struct netlbl_dom_map *dom_entry; | |
463 | ||
464 | rcu_read_lock(); | |
465 | dom_entry = netlbl_domhsh_getentry(secattr->domain); | |
466 | if (dom_entry == NULL) | |
467 | goto socket_setattr_return; | |
468 | switch (dom_entry->type) { | |
469 | case NETLBL_NLTYPE_CIPSOV4: | |
ba6ff9f2 PM |
470 | ret_val = cipso_v4_sock_setattr(sk, |
471 | dom_entry->type_def.cipsov4, | |
472 | secattr); | |
d15c345f PM |
473 | break; |
474 | case NETLBL_NLTYPE_UNLABELED: | |
475 | ret_val = 0; | |
476 | break; | |
477 | default: | |
478 | ret_val = -ENOENT; | |
479 | } | |
480 | ||
481 | socket_setattr_return: | |
482 | rcu_read_unlock(); | |
483 | return ret_val; | |
484 | } | |
485 | ||
14a72f53 PM |
486 | /** |
487 | * netlbl_sock_getattr - Determine the security attributes of a sock | |
488 | * @sk: the sock | |
489 | * @secattr: the security attributes | |
490 | * | |
491 | * Description: | |
8cc44579 | 492 | * Examines the given sock to see if any NetLabel style labeling has been |
14a72f53 PM |
493 | * applied to the sock, if so it parses the socket label and returns the |
494 | * security attributes in @secattr. Returns zero on success, negative values | |
495 | * on failure. | |
496 | * | |
497 | */ | |
498 | int netlbl_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr) | |
499 | { | |
8cc44579 | 500 | return cipso_v4_sock_getattr(sk, secattr); |
14a72f53 PM |
501 | } |
502 | ||
d15c345f PM |
503 | /** |
504 | * netlbl_skbuff_getattr - Determine the security attributes of a packet | |
505 | * @skb: the packet | |
75e22910 | 506 | * @family: protocol family |
d15c345f PM |
507 | * @secattr: the security attributes |
508 | * | |
509 | * Description: | |
510 | * Examines the given packet to see if a recognized form of packet labeling | |
511 | * is present, if so it parses the packet label and returns the security | |
512 | * attributes in @secattr. Returns zero on success, negative values on | |
513 | * failure. | |
514 | * | |
515 | */ | |
516 | int netlbl_skbuff_getattr(const struct sk_buff *skb, | |
75e22910 | 517 | u16 family, |
d15c345f PM |
518 | struct netlbl_lsm_secattr *secattr) |
519 | { | |
05e00cbf PM |
520 | if (CIPSO_V4_OPTEXIST(skb) && |
521 | cipso_v4_skbuff_getattr(skb, secattr) == 0) | |
d15c345f PM |
522 | return 0; |
523 | ||
8cc44579 | 524 | return netlbl_unlabel_getattr(skb, family, secattr); |
d15c345f PM |
525 | } |
526 | ||
527 | /** | |
528 | * netlbl_skbuff_err - Handle a LSM error on a sk_buff | |
529 | * @skb: the packet | |
530 | * @error: the error code | |
531 | * | |
532 | * Description: | |
533 | * Deal with a LSM problem when handling the packet in @skb, typically this is | |
534 | * a permission denied problem (-EACCES). The correct action is determined | |
535 | * according to the packet's labeling protocol. | |
536 | * | |
537 | */ | |
538 | void netlbl_skbuff_err(struct sk_buff *skb, int error) | |
539 | { | |
540 | if (CIPSO_V4_OPTEXIST(skb)) | |
541 | cipso_v4_error(skb, error, 0); | |
542 | } | |
543 | ||
544 | /** | |
545 | * netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches | |
546 | * | |
547 | * Description: | |
548 | * For all of the NetLabel protocols that support some form of label mapping | |
549 | * cache, invalidate the cache. Returns zero on success, negative values on | |
550 | * error. | |
551 | * | |
552 | */ | |
553 | void netlbl_cache_invalidate(void) | |
554 | { | |
555 | cipso_v4_cache_invalidate(); | |
556 | } | |
557 | ||
558 | /** | |
559 | * netlbl_cache_add - Add an entry to a NetLabel protocol cache | |
560 | * @skb: the packet | |
561 | * @secattr: the packet's security attributes | |
562 | * | |
563 | * Description: | |
564 | * Add the LSM security attributes for the given packet to the underlying | |
565 | * NetLabel protocol's label mapping cache. Returns zero on success, negative | |
566 | * values on error. | |
567 | * | |
568 | */ | |
569 | int netlbl_cache_add(const struct sk_buff *skb, | |
570 | const struct netlbl_lsm_secattr *secattr) | |
571 | { | |
701a90ba | 572 | if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0) |
d15c345f PM |
573 | return -ENOMSG; |
574 | ||
575 | if (CIPSO_V4_OPTEXIST(skb)) | |
576 | return cipso_v4_cache_add(skb, secattr); | |
577 | ||
578 | return -ENOMSG; | |
579 | } | |
580 | ||
581 | /* | |
582 | * Setup Functions | |
583 | */ | |
584 | ||
585 | /** | |
586 | * netlbl_init - Initialize NetLabel | |
587 | * | |
588 | * Description: | |
589 | * Perform the required NetLabel initialization before first use. | |
590 | * | |
591 | */ | |
592 | static int __init netlbl_init(void) | |
593 | { | |
594 | int ret_val; | |
595 | ||
596 | printk(KERN_INFO "NetLabel: Initializing\n"); | |
597 | printk(KERN_INFO "NetLabel: domain hash size = %u\n", | |
598 | (1 << NETLBL_DOMHSH_BITSIZE)); | |
599 | printk(KERN_INFO "NetLabel: protocols =" | |
600 | " UNLABELED" | |
601 | " CIPSOv4" | |
602 | "\n"); | |
603 | ||
604 | ret_val = netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE); | |
605 | if (ret_val != 0) | |
606 | goto init_failure; | |
607 | ||
8cc44579 PM |
608 | ret_val = netlbl_unlabel_init(NETLBL_UNLHSH_BITSIZE); |
609 | if (ret_val != 0) | |
610 | goto init_failure; | |
611 | ||
d15c345f PM |
612 | ret_val = netlbl_netlink_init(); |
613 | if (ret_val != 0) | |
614 | goto init_failure; | |
615 | ||
616 | ret_val = netlbl_unlabel_defconf(); | |
617 | if (ret_val != 0) | |
618 | goto init_failure; | |
619 | printk(KERN_INFO "NetLabel: unlabeled traffic allowed by default\n"); | |
620 | ||
621 | return 0; | |
622 | ||
623 | init_failure: | |
624 | panic("NetLabel: failed to initialize properly (%d)\n", ret_val); | |
625 | } | |
626 | ||
627 | subsys_initcall(netlbl_init); |