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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 | /* | |
014ab19a | 13 | * (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008 |
d15c345f PM |
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> |
6c2e8ac0 PM |
34 | #include <linux/in.h> |
35 | #include <linux/in6.h> | |
d15c345f | 36 | #include <net/ip.h> |
6c2e8ac0 | 37 | #include <net/ipv6.h> |
d15c345f PM |
38 | #include <net/netlabel.h> |
39 | #include <net/cipso_ipv4.h> | |
40 | #include <asm/bug.h> | |
c783f1ce | 41 | #include <asm/atomic.h> |
d15c345f PM |
42 | |
43 | #include "netlabel_domainhash.h" | |
44 | #include "netlabel_unlabeled.h" | |
eda61d32 | 45 | #include "netlabel_cipso_v4.h" |
d15c345f | 46 | #include "netlabel_user.h" |
23bcdc1a | 47 | #include "netlabel_mgmt.h" |
6c2e8ac0 | 48 | #include "netlabel_addrlist.h" |
d15c345f | 49 | |
eda61d32 PM |
50 | /* |
51 | * Configuration Functions | |
52 | */ | |
53 | ||
54 | /** | |
55 | * netlbl_cfg_map_del - Remove a NetLabel/LSM domain mapping | |
56 | * @domain: the domain mapping to remove | |
6c2e8ac0 PM |
57 | * @family: address family |
58 | * @addr: IP address | |
59 | * @mask: IP address mask | |
eda61d32 PM |
60 | * @audit_info: NetLabel audit information |
61 | * | |
62 | * Description: | |
63 | * Removes a NetLabel/LSM domain mapping. A @domain value of NULL causes the | |
64 | * default domain mapping to be removed. Returns zero on success, negative | |
65 | * values on failure. | |
66 | * | |
67 | */ | |
6c2e8ac0 PM |
68 | int netlbl_cfg_map_del(const char *domain, |
69 | u16 family, | |
70 | const void *addr, | |
71 | const void *mask, | |
72 | struct netlbl_audit *audit_info) | |
eda61d32 | 73 | { |
6c2e8ac0 PM |
74 | if (addr == NULL && mask == NULL) { |
75 | return netlbl_domhsh_remove(domain, audit_info); | |
76 | } else if (addr != NULL && mask != NULL) { | |
77 | switch (family) { | |
78 | case AF_INET: | |
79 | return netlbl_domhsh_remove_af4(domain, addr, mask, | |
80 | audit_info); | |
81 | default: | |
82 | return -EPFNOSUPPORT; | |
83 | } | |
84 | } else | |
85 | return -EINVAL; | |
eda61d32 PM |
86 | } |
87 | ||
88 | /** | |
6c2e8ac0 | 89 | * netlbl_cfg_unlbl_map_add - Add a new unlabeled mapping |
eda61d32 | 90 | * @domain: the domain mapping to add |
6c2e8ac0 PM |
91 | * @family: address family |
92 | * @addr: IP address | |
93 | * @mask: IP address mask | |
eda61d32 PM |
94 | * @audit_info: NetLabel audit information |
95 | * | |
96 | * Description: | |
97 | * Adds a new unlabeled NetLabel/LSM domain mapping. A @domain value of NULL | |
98 | * causes a new default domain mapping to be added. Returns zero on success, | |
99 | * negative values on failure. | |
100 | * | |
101 | */ | |
6c2e8ac0 PM |
102 | int netlbl_cfg_unlbl_map_add(const char *domain, |
103 | u16 family, | |
104 | const void *addr, | |
105 | const void *mask, | |
eda61d32 PM |
106 | struct netlbl_audit *audit_info) |
107 | { | |
108 | int ret_val = -ENOMEM; | |
109 | struct netlbl_dom_map *entry; | |
6c2e8ac0 PM |
110 | struct netlbl_domaddr_map *addrmap = NULL; |
111 | struct netlbl_domaddr4_map *map4 = NULL; | |
112 | struct netlbl_domaddr6_map *map6 = NULL; | |
113 | const struct in_addr *addr4, *mask4; | |
114 | const struct in6_addr *addr6, *mask6; | |
eda61d32 PM |
115 | |
116 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); | |
117 | if (entry == NULL) | |
948a7243 | 118 | return -ENOMEM; |
eda61d32 PM |
119 | if (domain != NULL) { |
120 | entry->domain = kstrdup(domain, GFP_ATOMIC); | |
121 | if (entry->domain == NULL) | |
6c2e8ac0 PM |
122 | goto cfg_unlbl_map_add_failure; |
123 | } | |
124 | ||
125 | if (addr == NULL && mask == NULL) | |
126 | entry->type = NETLBL_NLTYPE_UNLABELED; | |
127 | else if (addr != NULL && mask != NULL) { | |
128 | addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC); | |
129 | if (addrmap == NULL) | |
130 | goto cfg_unlbl_map_add_failure; | |
131 | INIT_LIST_HEAD(&addrmap->list4); | |
132 | INIT_LIST_HEAD(&addrmap->list6); | |
133 | ||
134 | switch (family) { | |
135 | case AF_INET: | |
136 | addr4 = addr; | |
137 | mask4 = mask; | |
138 | map4 = kzalloc(sizeof(*map4), GFP_ATOMIC); | |
139 | if (map4 == NULL) | |
140 | goto cfg_unlbl_map_add_failure; | |
141 | map4->type = NETLBL_NLTYPE_UNLABELED; | |
142 | map4->list.addr = addr4->s_addr & mask4->s_addr; | |
143 | map4->list.mask = mask4->s_addr; | |
144 | map4->list.valid = 1; | |
145 | ret_val = netlbl_af4list_add(&map4->list, | |
146 | &addrmap->list4); | |
147 | if (ret_val != 0) | |
148 | goto cfg_unlbl_map_add_failure; | |
149 | break; | |
150 | case AF_INET6: | |
151 | addr6 = addr; | |
152 | mask6 = mask; | |
153 | map6 = kzalloc(sizeof(*map6), GFP_ATOMIC); | |
154 | if (map4 == NULL) | |
155 | goto cfg_unlbl_map_add_failure; | |
156 | map6->type = NETLBL_NLTYPE_UNLABELED; | |
157 | ipv6_addr_copy(&map6->list.addr, addr6); | |
158 | map6->list.addr.s6_addr32[0] &= mask6->s6_addr32[0]; | |
159 | map6->list.addr.s6_addr32[1] &= mask6->s6_addr32[1]; | |
160 | map6->list.addr.s6_addr32[2] &= mask6->s6_addr32[2]; | |
161 | map6->list.addr.s6_addr32[3] &= mask6->s6_addr32[3]; | |
162 | ipv6_addr_copy(&map6->list.mask, mask6); | |
163 | map6->list.valid = 1; | |
164 | ret_val = netlbl_af4list_add(&map4->list, | |
165 | &addrmap->list4); | |
166 | if (ret_val != 0) | |
167 | goto cfg_unlbl_map_add_failure; | |
168 | break; | |
169 | default: | |
170 | goto cfg_unlbl_map_add_failure; | |
171 | break; | |
172 | } | |
173 | ||
174 | entry->type_def.addrsel = addrmap; | |
175 | entry->type = NETLBL_NLTYPE_ADDRSELECT; | |
176 | } else { | |
177 | ret_val = -EINVAL; | |
178 | goto cfg_unlbl_map_add_failure; | |
eda61d32 | 179 | } |
eda61d32 PM |
180 | |
181 | ret_val = netlbl_domhsh_add(entry, audit_info); | |
182 | if (ret_val != 0) | |
6c2e8ac0 | 183 | goto cfg_unlbl_map_add_failure; |
eda61d32 PM |
184 | |
185 | return 0; | |
186 | ||
6c2e8ac0 | 187 | cfg_unlbl_map_add_failure: |
eda61d32 PM |
188 | if (entry != NULL) |
189 | kfree(entry->domain); | |
190 | kfree(entry); | |
6c2e8ac0 PM |
191 | kfree(addrmap); |
192 | kfree(map4); | |
193 | kfree(map6); | |
eda61d32 PM |
194 | return ret_val; |
195 | } | |
196 | ||
6c2e8ac0 PM |
197 | |
198 | /** | |
199 | * netlbl_cfg_unlbl_static_add - Adds a new static label | |
200 | * @net: network namespace | |
201 | * @dev_name: interface name | |
202 | * @addr: IP address in network byte order (struct in[6]_addr) | |
203 | * @mask: address mask in network byte order (struct in[6]_addr) | |
204 | * @family: address family | |
205 | * @secid: LSM secid value for the entry | |
206 | * @audit_info: NetLabel audit information | |
207 | * | |
208 | * Description: | |
209 | * Adds a new NetLabel static label to be used when protocol provided labels | |
210 | * are not present on incoming traffic. If @dev_name is NULL then the default | |
211 | * interface will be used. Returns zero on success, negative values on failure. | |
212 | * | |
213 | */ | |
214 | int netlbl_cfg_unlbl_static_add(struct net *net, | |
215 | const char *dev_name, | |
216 | const void *addr, | |
217 | const void *mask, | |
218 | u16 family, | |
219 | u32 secid, | |
220 | struct netlbl_audit *audit_info) | |
221 | { | |
222 | u32 addr_len; | |
223 | ||
224 | switch (family) { | |
225 | case AF_INET: | |
226 | addr_len = sizeof(struct in_addr); | |
227 | break; | |
228 | case AF_INET6: | |
229 | addr_len = sizeof(struct in6_addr); | |
230 | break; | |
231 | default: | |
232 | return -EPFNOSUPPORT; | |
233 | } | |
234 | ||
235 | return netlbl_unlhsh_add(net, | |
236 | dev_name, addr, mask, addr_len, | |
237 | secid, audit_info); | |
238 | } | |
239 | ||
240 | /** | |
241 | * netlbl_cfg_unlbl_static_del - Removes an existing static label | |
242 | * @net: network namespace | |
243 | * @dev_name: interface name | |
244 | * @addr: IP address in network byte order (struct in[6]_addr) | |
245 | * @mask: address mask in network byte order (struct in[6]_addr) | |
246 | * @family: address family | |
247 | * @secid: LSM secid value for the entry | |
248 | * @audit_info: NetLabel audit information | |
249 | * | |
250 | * Description: | |
251 | * Removes an existing NetLabel static label used when protocol provided labels | |
252 | * are not present on incoming traffic. If @dev_name is NULL then the default | |
253 | * interface will be used. Returns zero on success, negative values on failure. | |
254 | * | |
255 | */ | |
256 | int netlbl_cfg_unlbl_static_del(struct net *net, | |
257 | const char *dev_name, | |
258 | const void *addr, | |
259 | const void *mask, | |
260 | u16 family, | |
261 | struct netlbl_audit *audit_info) | |
262 | { | |
263 | u32 addr_len; | |
264 | ||
265 | switch (family) { | |
266 | case AF_INET: | |
267 | addr_len = sizeof(struct in_addr); | |
268 | break; | |
269 | case AF_INET6: | |
270 | addr_len = sizeof(struct in6_addr); | |
271 | break; | |
272 | default: | |
273 | return -EPFNOSUPPORT; | |
274 | } | |
275 | ||
276 | return netlbl_unlhsh_remove(net, | |
277 | dev_name, addr, mask, addr_len, | |
278 | audit_info); | |
279 | } | |
280 | ||
281 | /** | |
282 | * netlbl_cfg_cipsov4_add - Add a new CIPSOv4 DOI definition | |
283 | * @doi_def: CIPSO DOI definition | |
284 | * @audit_info: NetLabel audit information | |
285 | * | |
286 | * Description: | |
287 | * Add a new CIPSO DOI definition as defined by @doi_def. Returns zero on | |
288 | * success and negative values on failure. | |
289 | * | |
290 | */ | |
291 | int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def, | |
292 | struct netlbl_audit *audit_info) | |
293 | { | |
294 | return cipso_v4_doi_add(doi_def, audit_info); | |
295 | } | |
296 | ||
297 | /** | |
298 | * netlbl_cfg_cipsov4_del - Remove an existing CIPSOv4 DOI definition | |
299 | * @doi: CIPSO DOI | |
300 | * @audit_info: NetLabel audit information | |
301 | * | |
302 | * Description: | |
303 | * Remove an existing CIPSO DOI definition matching @doi. Returns zero on | |
304 | * success and negative values on failure. | |
305 | * | |
306 | */ | |
307 | void netlbl_cfg_cipsov4_del(u32 doi, struct netlbl_audit *audit_info) | |
308 | { | |
309 | cipso_v4_doi_remove(doi, audit_info); | |
310 | } | |
311 | ||
eda61d32 | 312 | /** |
6c2e8ac0 PM |
313 | * netlbl_cfg_cipsov4_map_add - Add a new CIPSOv4 DOI mapping |
314 | * @doi: the CIPSO DOI | |
eda61d32 | 315 | * @domain: the domain mapping to add |
6c2e8ac0 PM |
316 | * @addr: IP address |
317 | * @mask: IP address mask | |
eda61d32 PM |
318 | * @audit_info: NetLabel audit information |
319 | * | |
320 | * Description: | |
6c2e8ac0 PM |
321 | * Add a new NetLabel/LSM domain mapping for the given CIPSO DOI to the NetLabel |
322 | * subsystem. A @domain value of NULL adds a new default domain mapping. | |
323 | * Returns zero on success, negative values on failure. | |
eda61d32 PM |
324 | * |
325 | */ | |
6c2e8ac0 | 326 | int netlbl_cfg_cipsov4_map_add(u32 doi, |
eda61d32 | 327 | const char *domain, |
6c2e8ac0 PM |
328 | const struct in_addr *addr, |
329 | const struct in_addr *mask, | |
eda61d32 PM |
330 | struct netlbl_audit *audit_info) |
331 | { | |
332 | int ret_val = -ENOMEM; | |
6c2e8ac0 | 333 | struct cipso_v4_doi *doi_def; |
eda61d32 | 334 | struct netlbl_dom_map *entry; |
6c2e8ac0 PM |
335 | struct netlbl_domaddr_map *addrmap = NULL; |
336 | struct netlbl_domaddr4_map *addrinfo = NULL; | |
eda61d32 | 337 | |
6c2e8ac0 PM |
338 | doi_def = cipso_v4_doi_getdef(doi); |
339 | if (doi_def == NULL) | |
340 | return -ENOENT; | |
b1edeb10 | 341 | |
eda61d32 PM |
342 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); |
343 | if (entry == NULL) | |
948a7243 | 344 | return -ENOMEM; |
eda61d32 PM |
345 | if (domain != NULL) { |
346 | entry->domain = kstrdup(domain, GFP_ATOMIC); | |
347 | if (entry->domain == NULL) | |
6c2e8ac0 | 348 | goto cfg_cipsov4_map_add_failure; |
eda61d32 | 349 | } |
eda61d32 | 350 | |
6c2e8ac0 PM |
351 | if (addr == NULL && mask == NULL) { |
352 | entry->type_def.cipsov4 = doi_def; | |
353 | entry->type = NETLBL_NLTYPE_CIPSOV4; | |
354 | } else if (addr != NULL && mask != NULL) { | |
355 | addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC); | |
356 | if (addrmap == NULL) | |
357 | goto cfg_cipsov4_map_add_failure; | |
358 | INIT_LIST_HEAD(&addrmap->list4); | |
359 | INIT_LIST_HEAD(&addrmap->list6); | |
360 | ||
361 | addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC); | |
362 | if (addrinfo == NULL) | |
363 | goto cfg_cipsov4_map_add_failure; | |
364 | addrinfo->type_def.cipsov4 = doi_def; | |
365 | addrinfo->type = NETLBL_NLTYPE_CIPSOV4; | |
366 | addrinfo->list.addr = addr->s_addr & mask->s_addr; | |
367 | addrinfo->list.mask = mask->s_addr; | |
368 | addrinfo->list.valid = 1; | |
369 | ret_val = netlbl_af4list_add(&addrinfo->list, &addrmap->list4); | |
370 | if (ret_val != 0) | |
371 | goto cfg_cipsov4_map_add_failure; | |
372 | ||
373 | entry->type_def.addrsel = addrmap; | |
374 | entry->type = NETLBL_NLTYPE_ADDRSELECT; | |
375 | } else { | |
376 | ret_val = -EINVAL; | |
377 | goto cfg_cipsov4_map_add_failure; | |
b1edeb10 | 378 | } |
6c2e8ac0 | 379 | |
eda61d32 PM |
380 | ret_val = netlbl_domhsh_add(entry, audit_info); |
381 | if (ret_val != 0) | |
6c2e8ac0 | 382 | goto cfg_cipsov4_map_add_failure; |
b1edeb10 | 383 | |
6c2e8ac0 | 384 | return 0; |
b1edeb10 | 385 | |
6c2e8ac0 | 386 | cfg_cipsov4_map_add_failure: |
b1edeb10 | 387 | cipso_v4_doi_putdef(doi_def); |
eda61d32 PM |
388 | if (entry != NULL) |
389 | kfree(entry->domain); | |
390 | kfree(entry); | |
6c2e8ac0 PM |
391 | kfree(addrmap); |
392 | kfree(addrinfo); | |
393 | return ret_val; | |
eda61d32 PM |
394 | } |
395 | ||
02752760 PM |
396 | /* |
397 | * Security Attribute Functions | |
398 | */ | |
399 | ||
400 | /** | |
401 | * netlbl_secattr_catmap_walk - Walk a LSM secattr catmap looking for a bit | |
402 | * @catmap: the category bitmap | |
403 | * @offset: the offset to start searching at, in bits | |
404 | * | |
405 | * Description: | |
406 | * This function walks a LSM secattr category bitmap starting at @offset and | |
407 | * returns the spot of the first set bit or -ENOENT if no bits are set. | |
408 | * | |
409 | */ | |
410 | int netlbl_secattr_catmap_walk(struct netlbl_lsm_secattr_catmap *catmap, | |
411 | u32 offset) | |
412 | { | |
413 | struct netlbl_lsm_secattr_catmap *iter = catmap; | |
414 | u32 node_idx; | |
415 | u32 node_bit; | |
416 | NETLBL_CATMAP_MAPTYPE bitmap; | |
417 | ||
418 | if (offset > iter->startbit) { | |
419 | while (offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) { | |
420 | iter = iter->next; | |
421 | if (iter == NULL) | |
422 | return -ENOENT; | |
423 | } | |
424 | node_idx = (offset - iter->startbit) / NETLBL_CATMAP_MAPSIZE; | |
425 | node_bit = offset - iter->startbit - | |
426 | (NETLBL_CATMAP_MAPSIZE * node_idx); | |
427 | } else { | |
428 | node_idx = 0; | |
429 | node_bit = 0; | |
430 | } | |
431 | bitmap = iter->bitmap[node_idx] >> node_bit; | |
432 | ||
433 | for (;;) { | |
434 | if (bitmap != 0) { | |
435 | while ((bitmap & NETLBL_CATMAP_BIT) == 0) { | |
436 | bitmap >>= 1; | |
437 | node_bit++; | |
438 | } | |
439 | return iter->startbit + | |
440 | (NETLBL_CATMAP_MAPSIZE * node_idx) + node_bit; | |
441 | } | |
442 | if (++node_idx >= NETLBL_CATMAP_MAPCNT) { | |
443 | if (iter->next != NULL) { | |
444 | iter = iter->next; | |
445 | node_idx = 0; | |
446 | } else | |
447 | return -ENOENT; | |
448 | } | |
449 | bitmap = iter->bitmap[node_idx]; | |
450 | node_bit = 0; | |
451 | } | |
452 | ||
453 | return -ENOENT; | |
454 | } | |
455 | ||
456 | /** | |
457 | * netlbl_secattr_catmap_walk_rng - Find the end of a string of set bits | |
458 | * @catmap: the category bitmap | |
459 | * @offset: the offset to start searching at, in bits | |
460 | * | |
461 | * Description: | |
462 | * This function walks a LSM secattr category bitmap starting at @offset and | |
463 | * returns the spot of the first cleared bit or -ENOENT if the offset is past | |
464 | * the end of the bitmap. | |
465 | * | |
466 | */ | |
467 | int netlbl_secattr_catmap_walk_rng(struct netlbl_lsm_secattr_catmap *catmap, | |
468 | u32 offset) | |
469 | { | |
470 | struct netlbl_lsm_secattr_catmap *iter = catmap; | |
471 | u32 node_idx; | |
472 | u32 node_bit; | |
473 | NETLBL_CATMAP_MAPTYPE bitmask; | |
474 | NETLBL_CATMAP_MAPTYPE bitmap; | |
475 | ||
476 | if (offset > iter->startbit) { | |
477 | while (offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) { | |
478 | iter = iter->next; | |
479 | if (iter == NULL) | |
480 | return -ENOENT; | |
481 | } | |
482 | node_idx = (offset - iter->startbit) / NETLBL_CATMAP_MAPSIZE; | |
483 | node_bit = offset - iter->startbit - | |
484 | (NETLBL_CATMAP_MAPSIZE * node_idx); | |
485 | } else { | |
486 | node_idx = 0; | |
487 | node_bit = 0; | |
488 | } | |
489 | bitmask = NETLBL_CATMAP_BIT << node_bit; | |
490 | ||
491 | for (;;) { | |
492 | bitmap = iter->bitmap[node_idx]; | |
493 | while (bitmask != 0 && (bitmap & bitmask) != 0) { | |
494 | bitmask <<= 1; | |
495 | node_bit++; | |
496 | } | |
497 | ||
498 | if (bitmask != 0) | |
499 | return iter->startbit + | |
500 | (NETLBL_CATMAP_MAPSIZE * node_idx) + | |
501 | node_bit - 1; | |
502 | else if (++node_idx >= NETLBL_CATMAP_MAPCNT) { | |
503 | if (iter->next == NULL) | |
504 | return iter->startbit + NETLBL_CATMAP_SIZE - 1; | |
505 | iter = iter->next; | |
506 | node_idx = 0; | |
507 | } | |
508 | bitmask = NETLBL_CATMAP_BIT; | |
509 | node_bit = 0; | |
510 | } | |
511 | ||
512 | return -ENOENT; | |
513 | } | |
514 | ||
515 | /** | |
516 | * netlbl_secattr_catmap_setbit - Set a bit in a LSM secattr catmap | |
517 | * @catmap: the category bitmap | |
518 | * @bit: the bit to set | |
519 | * @flags: memory allocation flags | |
520 | * | |
521 | * Description: | |
522 | * Set the bit specified by @bit in @catmap. Returns zero on success, | |
523 | * negative values on failure. | |
524 | * | |
525 | */ | |
526 | int netlbl_secattr_catmap_setbit(struct netlbl_lsm_secattr_catmap *catmap, | |
527 | u32 bit, | |
528 | gfp_t flags) | |
529 | { | |
530 | struct netlbl_lsm_secattr_catmap *iter = catmap; | |
531 | u32 node_bit; | |
532 | u32 node_idx; | |
533 | ||
534 | while (iter->next != NULL && | |
535 | bit >= (iter->startbit + NETLBL_CATMAP_SIZE)) | |
536 | iter = iter->next; | |
537 | if (bit >= (iter->startbit + NETLBL_CATMAP_SIZE)) { | |
538 | iter->next = netlbl_secattr_catmap_alloc(flags); | |
539 | if (iter->next == NULL) | |
540 | return -ENOMEM; | |
541 | iter = iter->next; | |
542 | iter->startbit = bit & ~(NETLBL_CATMAP_SIZE - 1); | |
543 | } | |
544 | ||
545 | /* gcc always rounds to zero when doing integer division */ | |
546 | node_idx = (bit - iter->startbit) / NETLBL_CATMAP_MAPSIZE; | |
547 | node_bit = bit - iter->startbit - (NETLBL_CATMAP_MAPSIZE * node_idx); | |
548 | iter->bitmap[node_idx] |= NETLBL_CATMAP_BIT << node_bit; | |
549 | ||
550 | return 0; | |
551 | } | |
552 | ||
553 | /** | |
554 | * netlbl_secattr_catmap_setrng - Set a range of bits in a LSM secattr catmap | |
555 | * @catmap: the category bitmap | |
556 | * @start: the starting bit | |
557 | * @end: the last bit in the string | |
558 | * @flags: memory allocation flags | |
559 | * | |
560 | * Description: | |
561 | * Set a range of bits, starting at @start and ending with @end. Returns zero | |
562 | * on success, negative values on failure. | |
563 | * | |
564 | */ | |
565 | int netlbl_secattr_catmap_setrng(struct netlbl_lsm_secattr_catmap *catmap, | |
566 | u32 start, | |
567 | u32 end, | |
568 | gfp_t flags) | |
569 | { | |
570 | int ret_val = 0; | |
571 | struct netlbl_lsm_secattr_catmap *iter = catmap; | |
572 | u32 iter_max_spot; | |
573 | u32 spot; | |
574 | ||
575 | /* XXX - This could probably be made a bit faster by combining writes | |
576 | * to the catmap instead of setting a single bit each time, but for | |
577 | * right now skipping to the start of the range in the catmap should | |
578 | * be a nice improvement over calling the individual setbit function | |
579 | * repeatedly from a loop. */ | |
580 | ||
581 | while (iter->next != NULL && | |
582 | start >= (iter->startbit + NETLBL_CATMAP_SIZE)) | |
583 | iter = iter->next; | |
584 | iter_max_spot = iter->startbit + NETLBL_CATMAP_SIZE; | |
585 | ||
586 | for (spot = start; spot <= end && ret_val == 0; spot++) { | |
587 | if (spot >= iter_max_spot && iter->next != NULL) { | |
588 | iter = iter->next; | |
589 | iter_max_spot = iter->startbit + NETLBL_CATMAP_SIZE; | |
590 | } | |
591 | ret_val = netlbl_secattr_catmap_setbit(iter, spot, GFP_ATOMIC); | |
592 | } | |
593 | ||
594 | return ret_val; | |
595 | } | |
596 | ||
d15c345f PM |
597 | /* |
598 | * LSM Functions | |
599 | */ | |
600 | ||
23bcdc1a PM |
601 | /** |
602 | * netlbl_enabled - Determine if the NetLabel subsystem is enabled | |
603 | * | |
604 | * Description: | |
605 | * The LSM can use this function to determine if it should use NetLabel | |
606 | * security attributes in it's enforcement mechanism. Currently, NetLabel is | |
607 | * considered to be enabled when it's configuration contains a valid setup for | |
608 | * at least one labeled protocol (i.e. NetLabel can understand incoming | |
609 | * labeled packets of at least one type); otherwise NetLabel is considered to | |
610 | * be disabled. | |
611 | * | |
612 | */ | |
613 | int netlbl_enabled(void) | |
614 | { | |
615 | /* At some point we probably want to expose this mechanism to the user | |
616 | * as well so that admins can toggle NetLabel regardless of the | |
617 | * configuration */ | |
c783f1ce | 618 | return (atomic_read(&netlabel_mgmt_protocount) > 0); |
23bcdc1a PM |
619 | } |
620 | ||
d15c345f PM |
621 | /** |
622 | * netlbl_socket_setattr - Label a socket using the correct protocol | |
ba6ff9f2 | 623 | * @sk: the socket to label |
d15c345f PM |
624 | * @secattr: the security attributes |
625 | * | |
626 | * Description: | |
627 | * Attach the correct label to the given socket using the security attributes | |
ba6ff9f2 PM |
628 | * specified in @secattr. This function requires exclusive access to @sk, |
629 | * which means it either needs to be in the process of being created or locked. | |
63c41688 PM |
630 | * Returns zero on success, -EDESTADDRREQ if the domain is configured to use |
631 | * network address selectors (can't blindly label the socket), and negative | |
632 | * values on all other failures. | |
d15c345f PM |
633 | * |
634 | */ | |
ba6ff9f2 PM |
635 | int netlbl_sock_setattr(struct sock *sk, |
636 | const struct netlbl_lsm_secattr *secattr) | |
d15c345f PM |
637 | { |
638 | int ret_val = -ENOENT; | |
639 | struct netlbl_dom_map *dom_entry; | |
640 | ||
641 | rcu_read_lock(); | |
642 | dom_entry = netlbl_domhsh_getentry(secattr->domain); | |
643 | if (dom_entry == NULL) | |
644 | goto socket_setattr_return; | |
645 | switch (dom_entry->type) { | |
63c41688 PM |
646 | case NETLBL_NLTYPE_ADDRSELECT: |
647 | ret_val = -EDESTADDRREQ; | |
648 | break; | |
d15c345f | 649 | case NETLBL_NLTYPE_CIPSOV4: |
ba6ff9f2 PM |
650 | ret_val = cipso_v4_sock_setattr(sk, |
651 | dom_entry->type_def.cipsov4, | |
652 | secattr); | |
d15c345f PM |
653 | break; |
654 | case NETLBL_NLTYPE_UNLABELED: | |
655 | ret_val = 0; | |
656 | break; | |
657 | default: | |
658 | ret_val = -ENOENT; | |
659 | } | |
660 | ||
661 | socket_setattr_return: | |
662 | rcu_read_unlock(); | |
663 | return ret_val; | |
664 | } | |
665 | ||
014ab19a PM |
666 | /** |
667 | * netlbl_sock_delattr - Delete all the NetLabel labels on a socket | |
668 | * @sk: the socket | |
669 | * | |
670 | * Description: | |
671 | * Remove all the NetLabel labeling from @sk. The caller is responsible for | |
672 | * ensuring that @sk is locked. | |
673 | * | |
674 | */ | |
675 | void netlbl_sock_delattr(struct sock *sk) | |
676 | { | |
677 | cipso_v4_sock_delattr(sk); | |
678 | } | |
679 | ||
14a72f53 PM |
680 | /** |
681 | * netlbl_sock_getattr - Determine the security attributes of a sock | |
682 | * @sk: the sock | |
683 | * @secattr: the security attributes | |
684 | * | |
685 | * Description: | |
8cc44579 | 686 | * Examines the given sock to see if any NetLabel style labeling has been |
14a72f53 PM |
687 | * applied to the sock, if so it parses the socket label and returns the |
688 | * security attributes in @secattr. Returns zero on success, negative values | |
689 | * on failure. | |
690 | * | |
691 | */ | |
692 | int netlbl_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr) | |
693 | { | |
8cc44579 | 694 | return cipso_v4_sock_getattr(sk, secattr); |
14a72f53 PM |
695 | } |
696 | ||
014ab19a PM |
697 | /** |
698 | * netlbl_conn_setattr - Label a connected socket using the correct protocol | |
699 | * @sk: the socket to label | |
700 | * @addr: the destination address | |
701 | * @secattr: the security attributes | |
702 | * | |
703 | * Description: | |
704 | * Attach the correct label to the given connected socket using the security | |
705 | * attributes specified in @secattr. The caller is responsible for ensuring | |
706 | * that @sk is locked. Returns zero on success, negative values on failure. | |
707 | * | |
708 | */ | |
709 | int netlbl_conn_setattr(struct sock *sk, | |
710 | struct sockaddr *addr, | |
711 | const struct netlbl_lsm_secattr *secattr) | |
712 | { | |
713 | int ret_val; | |
714 | struct sockaddr_in *addr4; | |
715 | struct netlbl_domaddr4_map *af4_entry; | |
716 | ||
717 | rcu_read_lock(); | |
718 | switch (addr->sa_family) { | |
719 | case AF_INET: | |
720 | addr4 = (struct sockaddr_in *)addr; | |
721 | af4_entry = netlbl_domhsh_getentry_af4(secattr->domain, | |
722 | addr4->sin_addr.s_addr); | |
723 | if (af4_entry == NULL) { | |
724 | ret_val = -ENOENT; | |
725 | goto conn_setattr_return; | |
726 | } | |
727 | switch (af4_entry->type) { | |
728 | case NETLBL_NLTYPE_CIPSOV4: | |
729 | ret_val = cipso_v4_sock_setattr(sk, | |
730 | af4_entry->type_def.cipsov4, | |
731 | secattr); | |
732 | break; | |
733 | case NETLBL_NLTYPE_UNLABELED: | |
734 | /* just delete the protocols we support for right now | |
735 | * but we could remove other protocols if needed */ | |
736 | cipso_v4_sock_delattr(sk); | |
737 | ret_val = 0; | |
738 | break; | |
739 | default: | |
740 | ret_val = -ENOENT; | |
741 | } | |
742 | break; | |
743 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
744 | case AF_INET6: | |
745 | /* since we don't support any IPv6 labeling protocols right | |
746 | * now we can optimize everything away until we do */ | |
747 | ret_val = 0; | |
748 | break; | |
749 | #endif /* IPv6 */ | |
750 | default: | |
751 | ret_val = 0; | |
752 | } | |
753 | ||
754 | conn_setattr_return: | |
755 | rcu_read_unlock(); | |
756 | return ret_val; | |
757 | } | |
758 | ||
948bf85c PM |
759 | /** |
760 | * netlbl_skbuff_setattr - Label a packet using the correct protocol | |
761 | * @skb: the packet | |
762 | * @family: protocol family | |
763 | * @secattr: the security attributes | |
764 | * | |
765 | * Description: | |
766 | * Attach the correct label to the given packet using the security attributes | |
767 | * specified in @secattr. Returns zero on success, negative values on failure. | |
768 | * | |
769 | */ | |
770 | int netlbl_skbuff_setattr(struct sk_buff *skb, | |
771 | u16 family, | |
772 | const struct netlbl_lsm_secattr *secattr) | |
773 | { | |
774 | int ret_val; | |
775 | struct iphdr *hdr4; | |
776 | struct netlbl_domaddr4_map *af4_entry; | |
777 | ||
778 | rcu_read_lock(); | |
779 | switch (family) { | |
780 | case AF_INET: | |
781 | hdr4 = ip_hdr(skb); | |
782 | af4_entry = netlbl_domhsh_getentry_af4(secattr->domain, | |
783 | hdr4->daddr); | |
784 | if (af4_entry == NULL) { | |
785 | ret_val = -ENOENT; | |
786 | goto skbuff_setattr_return; | |
787 | } | |
788 | switch (af4_entry->type) { | |
789 | case NETLBL_NLTYPE_CIPSOV4: | |
790 | ret_val = cipso_v4_skbuff_setattr(skb, | |
791 | af4_entry->type_def.cipsov4, | |
792 | secattr); | |
793 | break; | |
794 | case NETLBL_NLTYPE_UNLABELED: | |
795 | /* just delete the protocols we support for right now | |
796 | * but we could remove other protocols if needed */ | |
797 | ret_val = cipso_v4_skbuff_delattr(skb); | |
798 | break; | |
799 | default: | |
800 | ret_val = -ENOENT; | |
801 | } | |
802 | break; | |
803 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
804 | case AF_INET6: | |
805 | /* since we don't support any IPv6 labeling protocols right | |
806 | * now we can optimize everything away until we do */ | |
807 | ret_val = 0; | |
808 | break; | |
809 | #endif /* IPv6 */ | |
810 | default: | |
811 | ret_val = 0; | |
812 | } | |
813 | ||
814 | skbuff_setattr_return: | |
815 | rcu_read_unlock(); | |
816 | return ret_val; | |
817 | } | |
818 | ||
d15c345f PM |
819 | /** |
820 | * netlbl_skbuff_getattr - Determine the security attributes of a packet | |
821 | * @skb: the packet | |
75e22910 | 822 | * @family: protocol family |
d15c345f PM |
823 | * @secattr: the security attributes |
824 | * | |
825 | * Description: | |
826 | * Examines the given packet to see if a recognized form of packet labeling | |
827 | * is present, if so it parses the packet label and returns the security | |
828 | * attributes in @secattr. Returns zero on success, negative values on | |
829 | * failure. | |
830 | * | |
831 | */ | |
832 | int netlbl_skbuff_getattr(const struct sk_buff *skb, | |
75e22910 | 833 | u16 family, |
d15c345f PM |
834 | struct netlbl_lsm_secattr *secattr) |
835 | { | |
05e00cbf PM |
836 | if (CIPSO_V4_OPTEXIST(skb) && |
837 | cipso_v4_skbuff_getattr(skb, secattr) == 0) | |
d15c345f PM |
838 | return 0; |
839 | ||
8cc44579 | 840 | return netlbl_unlabel_getattr(skb, family, secattr); |
d15c345f PM |
841 | } |
842 | ||
843 | /** | |
844 | * netlbl_skbuff_err - Handle a LSM error on a sk_buff | |
845 | * @skb: the packet | |
846 | * @error: the error code | |
dfaebe98 | 847 | * @gateway: true if host is acting as a gateway, false otherwise |
d15c345f PM |
848 | * |
849 | * Description: | |
850 | * Deal with a LSM problem when handling the packet in @skb, typically this is | |
851 | * a permission denied problem (-EACCES). The correct action is determined | |
852 | * according to the packet's labeling protocol. | |
853 | * | |
854 | */ | |
dfaebe98 | 855 | void netlbl_skbuff_err(struct sk_buff *skb, int error, int gateway) |
d15c345f PM |
856 | { |
857 | if (CIPSO_V4_OPTEXIST(skb)) | |
dfaebe98 | 858 | cipso_v4_error(skb, error, gateway); |
d15c345f PM |
859 | } |
860 | ||
861 | /** | |
862 | * netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches | |
863 | * | |
864 | * Description: | |
865 | * For all of the NetLabel protocols that support some form of label mapping | |
866 | * cache, invalidate the cache. Returns zero on success, negative values on | |
867 | * error. | |
868 | * | |
869 | */ | |
870 | void netlbl_cache_invalidate(void) | |
871 | { | |
872 | cipso_v4_cache_invalidate(); | |
873 | } | |
874 | ||
875 | /** | |
876 | * netlbl_cache_add - Add an entry to a NetLabel protocol cache | |
877 | * @skb: the packet | |
878 | * @secattr: the packet's security attributes | |
879 | * | |
880 | * Description: | |
881 | * Add the LSM security attributes for the given packet to the underlying | |
882 | * NetLabel protocol's label mapping cache. Returns zero on success, negative | |
883 | * values on error. | |
884 | * | |
885 | */ | |
886 | int netlbl_cache_add(const struct sk_buff *skb, | |
887 | const struct netlbl_lsm_secattr *secattr) | |
888 | { | |
701a90ba | 889 | if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0) |
d15c345f PM |
890 | return -ENOMSG; |
891 | ||
892 | if (CIPSO_V4_OPTEXIST(skb)) | |
893 | return cipso_v4_cache_add(skb, secattr); | |
894 | ||
895 | return -ENOMSG; | |
896 | } | |
897 | ||
6c2e8ac0 PM |
898 | /* |
899 | * Protocol Engine Functions | |
900 | */ | |
901 | ||
902 | /** | |
903 | * netlbl_audit_start - Start an audit message | |
904 | * @type: audit message type | |
905 | * @audit_info: NetLabel audit information | |
906 | * | |
907 | * Description: | |
908 | * Start an audit message using the type specified in @type and fill the audit | |
909 | * message with some fields common to all NetLabel audit messages. This | |
910 | * function should only be used by protocol engines, not LSMs. Returns a | |
911 | * pointer to the audit buffer on success, NULL on failure. | |
912 | * | |
913 | */ | |
914 | struct audit_buffer *netlbl_audit_start(int type, | |
915 | struct netlbl_audit *audit_info) | |
916 | { | |
917 | return netlbl_audit_start_common(type, audit_info); | |
918 | } | |
919 | ||
d15c345f PM |
920 | /* |
921 | * Setup Functions | |
922 | */ | |
923 | ||
924 | /** | |
925 | * netlbl_init - Initialize NetLabel | |
926 | * | |
927 | * Description: | |
928 | * Perform the required NetLabel initialization before first use. | |
929 | * | |
930 | */ | |
931 | static int __init netlbl_init(void) | |
932 | { | |
933 | int ret_val; | |
934 | ||
935 | printk(KERN_INFO "NetLabel: Initializing\n"); | |
936 | printk(KERN_INFO "NetLabel: domain hash size = %u\n", | |
937 | (1 << NETLBL_DOMHSH_BITSIZE)); | |
938 | printk(KERN_INFO "NetLabel: protocols =" | |
939 | " UNLABELED" | |
940 | " CIPSOv4" | |
941 | "\n"); | |
942 | ||
943 | ret_val = netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE); | |
944 | if (ret_val != 0) | |
945 | goto init_failure; | |
946 | ||
8cc44579 PM |
947 | ret_val = netlbl_unlabel_init(NETLBL_UNLHSH_BITSIZE); |
948 | if (ret_val != 0) | |
949 | goto init_failure; | |
950 | ||
d15c345f PM |
951 | ret_val = netlbl_netlink_init(); |
952 | if (ret_val != 0) | |
953 | goto init_failure; | |
954 | ||
955 | ret_val = netlbl_unlabel_defconf(); | |
956 | if (ret_val != 0) | |
957 | goto init_failure; | |
958 | printk(KERN_INFO "NetLabel: unlabeled traffic allowed by default\n"); | |
959 | ||
960 | return 0; | |
961 | ||
962 | init_failure: | |
963 | panic("NetLabel: failed to initialize properly (%d)\n", ret_val); | |
964 | } | |
965 | ||
966 | subsys_initcall(netlbl_init); |