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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); | |
ca7daea6 | 154 | if (map6 == NULL) |
6c2e8ac0 PM |
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: |
47943234 | 188 | kfree(entry->domain); |
eda61d32 | 189 | kfree(entry); |
6c2e8ac0 PM |
190 | kfree(addrmap); |
191 | kfree(map4); | |
192 | kfree(map6); | |
eda61d32 PM |
193 | return ret_val; |
194 | } | |
195 | ||
6c2e8ac0 PM |
196 | |
197 | /** | |
198 | * netlbl_cfg_unlbl_static_add - Adds a new static label | |
199 | * @net: network namespace | |
200 | * @dev_name: interface name | |
201 | * @addr: IP address in network byte order (struct in[6]_addr) | |
202 | * @mask: address mask in network byte order (struct in[6]_addr) | |
203 | * @family: address family | |
204 | * @secid: LSM secid value for the entry | |
205 | * @audit_info: NetLabel audit information | |
206 | * | |
207 | * Description: | |
208 | * Adds a new NetLabel static label to be used when protocol provided labels | |
209 | * are not present on incoming traffic. If @dev_name is NULL then the default | |
210 | * interface will be used. Returns zero on success, negative values on failure. | |
211 | * | |
212 | */ | |
213 | int netlbl_cfg_unlbl_static_add(struct net *net, | |
214 | const char *dev_name, | |
215 | const void *addr, | |
216 | const void *mask, | |
217 | u16 family, | |
218 | u32 secid, | |
219 | struct netlbl_audit *audit_info) | |
220 | { | |
221 | u32 addr_len; | |
222 | ||
223 | switch (family) { | |
224 | case AF_INET: | |
225 | addr_len = sizeof(struct in_addr); | |
226 | break; | |
227 | case AF_INET6: | |
228 | addr_len = sizeof(struct in6_addr); | |
229 | break; | |
230 | default: | |
231 | return -EPFNOSUPPORT; | |
232 | } | |
233 | ||
234 | return netlbl_unlhsh_add(net, | |
235 | dev_name, addr, mask, addr_len, | |
236 | secid, audit_info); | |
237 | } | |
238 | ||
239 | /** | |
240 | * netlbl_cfg_unlbl_static_del - Removes an existing static label | |
241 | * @net: network namespace | |
242 | * @dev_name: interface name | |
243 | * @addr: IP address in network byte order (struct in[6]_addr) | |
244 | * @mask: address mask in network byte order (struct in[6]_addr) | |
245 | * @family: address family | |
246 | * @secid: LSM secid value for the entry | |
247 | * @audit_info: NetLabel audit information | |
248 | * | |
249 | * Description: | |
250 | * Removes an existing NetLabel static label used when protocol provided labels | |
251 | * are not present on incoming traffic. If @dev_name is NULL then the default | |
252 | * interface will be used. Returns zero on success, negative values on failure. | |
253 | * | |
254 | */ | |
255 | int netlbl_cfg_unlbl_static_del(struct net *net, | |
256 | const char *dev_name, | |
257 | const void *addr, | |
258 | const void *mask, | |
259 | u16 family, | |
260 | struct netlbl_audit *audit_info) | |
261 | { | |
262 | u32 addr_len; | |
263 | ||
264 | switch (family) { | |
265 | case AF_INET: | |
266 | addr_len = sizeof(struct in_addr); | |
267 | break; | |
268 | case AF_INET6: | |
269 | addr_len = sizeof(struct in6_addr); | |
270 | break; | |
271 | default: | |
272 | return -EPFNOSUPPORT; | |
273 | } | |
274 | ||
275 | return netlbl_unlhsh_remove(net, | |
276 | dev_name, addr, mask, addr_len, | |
277 | audit_info); | |
278 | } | |
279 | ||
280 | /** | |
281 | * netlbl_cfg_cipsov4_add - Add a new CIPSOv4 DOI definition | |
282 | * @doi_def: CIPSO DOI definition | |
283 | * @audit_info: NetLabel audit information | |
284 | * | |
285 | * Description: | |
286 | * Add a new CIPSO DOI definition as defined by @doi_def. Returns zero on | |
287 | * success and negative values on failure. | |
288 | * | |
289 | */ | |
290 | int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def, | |
291 | struct netlbl_audit *audit_info) | |
292 | { | |
293 | return cipso_v4_doi_add(doi_def, audit_info); | |
294 | } | |
295 | ||
296 | /** | |
297 | * netlbl_cfg_cipsov4_del - Remove an existing CIPSOv4 DOI definition | |
298 | * @doi: CIPSO DOI | |
299 | * @audit_info: NetLabel audit information | |
300 | * | |
301 | * Description: | |
302 | * Remove an existing CIPSO DOI definition matching @doi. Returns zero on | |
303 | * success and negative values on failure. | |
304 | * | |
305 | */ | |
306 | void netlbl_cfg_cipsov4_del(u32 doi, struct netlbl_audit *audit_info) | |
307 | { | |
308 | cipso_v4_doi_remove(doi, audit_info); | |
309 | } | |
310 | ||
eda61d32 | 311 | /** |
6c2e8ac0 PM |
312 | * netlbl_cfg_cipsov4_map_add - Add a new CIPSOv4 DOI mapping |
313 | * @doi: the CIPSO DOI | |
eda61d32 | 314 | * @domain: the domain mapping to add |
6c2e8ac0 PM |
315 | * @addr: IP address |
316 | * @mask: IP address mask | |
eda61d32 PM |
317 | * @audit_info: NetLabel audit information |
318 | * | |
319 | * Description: | |
6c2e8ac0 PM |
320 | * Add a new NetLabel/LSM domain mapping for the given CIPSO DOI to the NetLabel |
321 | * subsystem. A @domain value of NULL adds a new default domain mapping. | |
322 | * Returns zero on success, negative values on failure. | |
eda61d32 PM |
323 | * |
324 | */ | |
6c2e8ac0 | 325 | int netlbl_cfg_cipsov4_map_add(u32 doi, |
eda61d32 | 326 | const char *domain, |
6c2e8ac0 PM |
327 | const struct in_addr *addr, |
328 | const struct in_addr *mask, | |
eda61d32 PM |
329 | struct netlbl_audit *audit_info) |
330 | { | |
331 | int ret_val = -ENOMEM; | |
6c2e8ac0 | 332 | struct cipso_v4_doi *doi_def; |
eda61d32 | 333 | struct netlbl_dom_map *entry; |
6c2e8ac0 PM |
334 | struct netlbl_domaddr_map *addrmap = NULL; |
335 | struct netlbl_domaddr4_map *addrinfo = NULL; | |
eda61d32 | 336 | |
6c2e8ac0 PM |
337 | doi_def = cipso_v4_doi_getdef(doi); |
338 | if (doi_def == NULL) | |
339 | return -ENOENT; | |
b1edeb10 | 340 | |
eda61d32 PM |
341 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); |
342 | if (entry == NULL) | |
948a7243 | 343 | return -ENOMEM; |
eda61d32 PM |
344 | if (domain != NULL) { |
345 | entry->domain = kstrdup(domain, GFP_ATOMIC); | |
346 | if (entry->domain == NULL) | |
6c2e8ac0 | 347 | goto cfg_cipsov4_map_add_failure; |
eda61d32 | 348 | } |
eda61d32 | 349 | |
6c2e8ac0 PM |
350 | if (addr == NULL && mask == NULL) { |
351 | entry->type_def.cipsov4 = doi_def; | |
352 | entry->type = NETLBL_NLTYPE_CIPSOV4; | |
353 | } else if (addr != NULL && mask != NULL) { | |
354 | addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC); | |
355 | if (addrmap == NULL) | |
356 | goto cfg_cipsov4_map_add_failure; | |
357 | INIT_LIST_HEAD(&addrmap->list4); | |
358 | INIT_LIST_HEAD(&addrmap->list6); | |
359 | ||
360 | addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC); | |
361 | if (addrinfo == NULL) | |
362 | goto cfg_cipsov4_map_add_failure; | |
363 | addrinfo->type_def.cipsov4 = doi_def; | |
364 | addrinfo->type = NETLBL_NLTYPE_CIPSOV4; | |
365 | addrinfo->list.addr = addr->s_addr & mask->s_addr; | |
366 | addrinfo->list.mask = mask->s_addr; | |
367 | addrinfo->list.valid = 1; | |
368 | ret_val = netlbl_af4list_add(&addrinfo->list, &addrmap->list4); | |
369 | if (ret_val != 0) | |
370 | goto cfg_cipsov4_map_add_failure; | |
371 | ||
372 | entry->type_def.addrsel = addrmap; | |
373 | entry->type = NETLBL_NLTYPE_ADDRSELECT; | |
374 | } else { | |
375 | ret_val = -EINVAL; | |
376 | goto cfg_cipsov4_map_add_failure; | |
b1edeb10 | 377 | } |
6c2e8ac0 | 378 | |
eda61d32 PM |
379 | ret_val = netlbl_domhsh_add(entry, audit_info); |
380 | if (ret_val != 0) | |
6c2e8ac0 | 381 | goto cfg_cipsov4_map_add_failure; |
b1edeb10 | 382 | |
6c2e8ac0 | 383 | return 0; |
b1edeb10 | 384 | |
6c2e8ac0 | 385 | cfg_cipsov4_map_add_failure: |
b1edeb10 | 386 | cipso_v4_doi_putdef(doi_def); |
47943234 | 387 | kfree(entry->domain); |
eda61d32 | 388 | kfree(entry); |
6c2e8ac0 PM |
389 | kfree(addrmap); |
390 | kfree(addrinfo); | |
391 | return ret_val; | |
eda61d32 PM |
392 | } |
393 | ||
02752760 PM |
394 | /* |
395 | * Security Attribute Functions | |
396 | */ | |
397 | ||
398 | /** | |
399 | * netlbl_secattr_catmap_walk - Walk a LSM secattr catmap looking for a bit | |
400 | * @catmap: the category bitmap | |
401 | * @offset: the offset to start searching at, in bits | |
402 | * | |
403 | * Description: | |
404 | * This function walks a LSM secattr category bitmap starting at @offset and | |
405 | * returns the spot of the first set bit or -ENOENT if no bits are set. | |
406 | * | |
407 | */ | |
408 | int netlbl_secattr_catmap_walk(struct netlbl_lsm_secattr_catmap *catmap, | |
409 | u32 offset) | |
410 | { | |
411 | struct netlbl_lsm_secattr_catmap *iter = catmap; | |
412 | u32 node_idx; | |
413 | u32 node_bit; | |
414 | NETLBL_CATMAP_MAPTYPE bitmap; | |
415 | ||
416 | if (offset > iter->startbit) { | |
417 | while (offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) { | |
418 | iter = iter->next; | |
419 | if (iter == NULL) | |
420 | return -ENOENT; | |
421 | } | |
422 | node_idx = (offset - iter->startbit) / NETLBL_CATMAP_MAPSIZE; | |
423 | node_bit = offset - iter->startbit - | |
424 | (NETLBL_CATMAP_MAPSIZE * node_idx); | |
425 | } else { | |
426 | node_idx = 0; | |
427 | node_bit = 0; | |
428 | } | |
429 | bitmap = iter->bitmap[node_idx] >> node_bit; | |
430 | ||
431 | for (;;) { | |
432 | if (bitmap != 0) { | |
433 | while ((bitmap & NETLBL_CATMAP_BIT) == 0) { | |
434 | bitmap >>= 1; | |
435 | node_bit++; | |
436 | } | |
437 | return iter->startbit + | |
438 | (NETLBL_CATMAP_MAPSIZE * node_idx) + node_bit; | |
439 | } | |
440 | if (++node_idx >= NETLBL_CATMAP_MAPCNT) { | |
441 | if (iter->next != NULL) { | |
442 | iter = iter->next; | |
443 | node_idx = 0; | |
444 | } else | |
445 | return -ENOENT; | |
446 | } | |
447 | bitmap = iter->bitmap[node_idx]; | |
448 | node_bit = 0; | |
449 | } | |
450 | ||
451 | return -ENOENT; | |
452 | } | |
453 | ||
454 | /** | |
455 | * netlbl_secattr_catmap_walk_rng - Find the end of a string of set bits | |
456 | * @catmap: the category bitmap | |
457 | * @offset: the offset to start searching at, in bits | |
458 | * | |
459 | * Description: | |
460 | * This function walks a LSM secattr category bitmap starting at @offset and | |
461 | * returns the spot of the first cleared bit or -ENOENT if the offset is past | |
462 | * the end of the bitmap. | |
463 | * | |
464 | */ | |
465 | int netlbl_secattr_catmap_walk_rng(struct netlbl_lsm_secattr_catmap *catmap, | |
466 | u32 offset) | |
467 | { | |
468 | struct netlbl_lsm_secattr_catmap *iter = catmap; | |
469 | u32 node_idx; | |
470 | u32 node_bit; | |
471 | NETLBL_CATMAP_MAPTYPE bitmask; | |
472 | NETLBL_CATMAP_MAPTYPE bitmap; | |
473 | ||
474 | if (offset > iter->startbit) { | |
475 | while (offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) { | |
476 | iter = iter->next; | |
477 | if (iter == NULL) | |
478 | return -ENOENT; | |
479 | } | |
480 | node_idx = (offset - iter->startbit) / NETLBL_CATMAP_MAPSIZE; | |
481 | node_bit = offset - iter->startbit - | |
482 | (NETLBL_CATMAP_MAPSIZE * node_idx); | |
483 | } else { | |
484 | node_idx = 0; | |
485 | node_bit = 0; | |
486 | } | |
487 | bitmask = NETLBL_CATMAP_BIT << node_bit; | |
488 | ||
489 | for (;;) { | |
490 | bitmap = iter->bitmap[node_idx]; | |
491 | while (bitmask != 0 && (bitmap & bitmask) != 0) { | |
492 | bitmask <<= 1; | |
493 | node_bit++; | |
494 | } | |
495 | ||
496 | if (bitmask != 0) | |
497 | return iter->startbit + | |
498 | (NETLBL_CATMAP_MAPSIZE * node_idx) + | |
499 | node_bit - 1; | |
500 | else if (++node_idx >= NETLBL_CATMAP_MAPCNT) { | |
501 | if (iter->next == NULL) | |
502 | return iter->startbit + NETLBL_CATMAP_SIZE - 1; | |
503 | iter = iter->next; | |
504 | node_idx = 0; | |
505 | } | |
506 | bitmask = NETLBL_CATMAP_BIT; | |
507 | node_bit = 0; | |
508 | } | |
509 | ||
510 | return -ENOENT; | |
511 | } | |
512 | ||
513 | /** | |
514 | * netlbl_secattr_catmap_setbit - Set a bit in a LSM secattr catmap | |
515 | * @catmap: the category bitmap | |
516 | * @bit: the bit to set | |
517 | * @flags: memory allocation flags | |
518 | * | |
519 | * Description: | |
520 | * Set the bit specified by @bit in @catmap. Returns zero on success, | |
521 | * negative values on failure. | |
522 | * | |
523 | */ | |
524 | int netlbl_secattr_catmap_setbit(struct netlbl_lsm_secattr_catmap *catmap, | |
525 | u32 bit, | |
526 | gfp_t flags) | |
527 | { | |
528 | struct netlbl_lsm_secattr_catmap *iter = catmap; | |
529 | u32 node_bit; | |
530 | u32 node_idx; | |
531 | ||
532 | while (iter->next != NULL && | |
533 | bit >= (iter->startbit + NETLBL_CATMAP_SIZE)) | |
534 | iter = iter->next; | |
535 | if (bit >= (iter->startbit + NETLBL_CATMAP_SIZE)) { | |
536 | iter->next = netlbl_secattr_catmap_alloc(flags); | |
537 | if (iter->next == NULL) | |
538 | return -ENOMEM; | |
539 | iter = iter->next; | |
540 | iter->startbit = bit & ~(NETLBL_CATMAP_SIZE - 1); | |
541 | } | |
542 | ||
543 | /* gcc always rounds to zero when doing integer division */ | |
544 | node_idx = (bit - iter->startbit) / NETLBL_CATMAP_MAPSIZE; | |
545 | node_bit = bit - iter->startbit - (NETLBL_CATMAP_MAPSIZE * node_idx); | |
546 | iter->bitmap[node_idx] |= NETLBL_CATMAP_BIT << node_bit; | |
547 | ||
548 | return 0; | |
549 | } | |
550 | ||
551 | /** | |
552 | * netlbl_secattr_catmap_setrng - Set a range of bits in a LSM secattr catmap | |
553 | * @catmap: the category bitmap | |
554 | * @start: the starting bit | |
555 | * @end: the last bit in the string | |
556 | * @flags: memory allocation flags | |
557 | * | |
558 | * Description: | |
559 | * Set a range of bits, starting at @start and ending with @end. Returns zero | |
560 | * on success, negative values on failure. | |
561 | * | |
562 | */ | |
563 | int netlbl_secattr_catmap_setrng(struct netlbl_lsm_secattr_catmap *catmap, | |
564 | u32 start, | |
565 | u32 end, | |
566 | gfp_t flags) | |
567 | { | |
568 | int ret_val = 0; | |
569 | struct netlbl_lsm_secattr_catmap *iter = catmap; | |
570 | u32 iter_max_spot; | |
571 | u32 spot; | |
572 | ||
573 | /* XXX - This could probably be made a bit faster by combining writes | |
574 | * to the catmap instead of setting a single bit each time, but for | |
575 | * right now skipping to the start of the range in the catmap should | |
576 | * be a nice improvement over calling the individual setbit function | |
577 | * repeatedly from a loop. */ | |
578 | ||
579 | while (iter->next != NULL && | |
580 | start >= (iter->startbit + NETLBL_CATMAP_SIZE)) | |
581 | iter = iter->next; | |
582 | iter_max_spot = iter->startbit + NETLBL_CATMAP_SIZE; | |
583 | ||
584 | for (spot = start; spot <= end && ret_val == 0; spot++) { | |
585 | if (spot >= iter_max_spot && iter->next != NULL) { | |
586 | iter = iter->next; | |
587 | iter_max_spot = iter->startbit + NETLBL_CATMAP_SIZE; | |
588 | } | |
589 | ret_val = netlbl_secattr_catmap_setbit(iter, spot, GFP_ATOMIC); | |
590 | } | |
591 | ||
592 | return ret_val; | |
593 | } | |
594 | ||
d15c345f PM |
595 | /* |
596 | * LSM Functions | |
597 | */ | |
598 | ||
23bcdc1a PM |
599 | /** |
600 | * netlbl_enabled - Determine if the NetLabel subsystem is enabled | |
601 | * | |
602 | * Description: | |
603 | * The LSM can use this function to determine if it should use NetLabel | |
604 | * security attributes in it's enforcement mechanism. Currently, NetLabel is | |
605 | * considered to be enabled when it's configuration contains a valid setup for | |
606 | * at least one labeled protocol (i.e. NetLabel can understand incoming | |
607 | * labeled packets of at least one type); otherwise NetLabel is considered to | |
608 | * be disabled. | |
609 | * | |
610 | */ | |
611 | int netlbl_enabled(void) | |
612 | { | |
613 | /* At some point we probably want to expose this mechanism to the user | |
614 | * as well so that admins can toggle NetLabel regardless of the | |
615 | * configuration */ | |
c783f1ce | 616 | return (atomic_read(&netlabel_mgmt_protocount) > 0); |
23bcdc1a PM |
617 | } |
618 | ||
d15c345f | 619 | /** |
389fb800 | 620 | * netlbl_sock_setattr - Label a socket using the correct protocol |
ba6ff9f2 | 621 | * @sk: the socket to label |
389fb800 | 622 | * @family: protocol family |
d15c345f PM |
623 | * @secattr: the security attributes |
624 | * | |
625 | * Description: | |
626 | * Attach the correct label to the given socket using the security attributes | |
ba6ff9f2 PM |
627 | * specified in @secattr. This function requires exclusive access to @sk, |
628 | * which means it either needs to be in the process of being created or locked. | |
63c41688 PM |
629 | * Returns zero on success, -EDESTADDRREQ if the domain is configured to use |
630 | * network address selectors (can't blindly label the socket), and negative | |
631 | * values on all other failures. | |
d15c345f PM |
632 | * |
633 | */ | |
ba6ff9f2 | 634 | int netlbl_sock_setattr(struct sock *sk, |
389fb800 | 635 | u16 family, |
ba6ff9f2 | 636 | const struct netlbl_lsm_secattr *secattr) |
d15c345f | 637 | { |
389fb800 | 638 | int ret_val; |
d15c345f PM |
639 | struct netlbl_dom_map *dom_entry; |
640 | ||
641 | rcu_read_lock(); | |
642 | dom_entry = netlbl_domhsh_getentry(secattr->domain); | |
389fb800 PM |
643 | if (dom_entry == NULL) { |
644 | ret_val = -ENOENT; | |
d15c345f | 645 | goto socket_setattr_return; |
389fb800 PM |
646 | } |
647 | switch (family) { | |
648 | case AF_INET: | |
649 | switch (dom_entry->type) { | |
650 | case NETLBL_NLTYPE_ADDRSELECT: | |
651 | ret_val = -EDESTADDRREQ; | |
652 | break; | |
653 | case NETLBL_NLTYPE_CIPSOV4: | |
654 | ret_val = cipso_v4_sock_setattr(sk, | |
655 | dom_entry->type_def.cipsov4, | |
656 | secattr); | |
657 | break; | |
658 | case NETLBL_NLTYPE_UNLABELED: | |
659 | ret_val = 0; | |
660 | break; | |
661 | default: | |
662 | ret_val = -ENOENT; | |
663 | } | |
d15c345f | 664 | break; |
389fb800 PM |
665 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
666 | case AF_INET6: | |
667 | /* since we don't support any IPv6 labeling protocols right | |
668 | * now we can optimize everything away until we do */ | |
d15c345f PM |
669 | ret_val = 0; |
670 | break; | |
389fb800 | 671 | #endif /* IPv6 */ |
d15c345f | 672 | default: |
389fb800 | 673 | ret_val = -EPROTONOSUPPORT; |
d15c345f PM |
674 | } |
675 | ||
676 | socket_setattr_return: | |
677 | rcu_read_unlock(); | |
678 | return ret_val; | |
679 | } | |
680 | ||
014ab19a PM |
681 | /** |
682 | * netlbl_sock_delattr - Delete all the NetLabel labels on a socket | |
683 | * @sk: the socket | |
684 | * | |
685 | * Description: | |
686 | * Remove all the NetLabel labeling from @sk. The caller is responsible for | |
687 | * ensuring that @sk is locked. | |
688 | * | |
689 | */ | |
690 | void netlbl_sock_delattr(struct sock *sk) | |
691 | { | |
692 | cipso_v4_sock_delattr(sk); | |
693 | } | |
694 | ||
14a72f53 PM |
695 | /** |
696 | * netlbl_sock_getattr - Determine the security attributes of a sock | |
697 | * @sk: the sock | |
698 | * @secattr: the security attributes | |
699 | * | |
700 | * Description: | |
8cc44579 | 701 | * Examines the given sock to see if any NetLabel style labeling has been |
14a72f53 PM |
702 | * applied to the sock, if so it parses the socket label and returns the |
703 | * security attributes in @secattr. Returns zero on success, negative values | |
704 | * on failure. | |
705 | * | |
706 | */ | |
389fb800 PM |
707 | int netlbl_sock_getattr(struct sock *sk, |
708 | struct netlbl_lsm_secattr *secattr) | |
14a72f53 | 709 | { |
389fb800 PM |
710 | int ret_val; |
711 | ||
712 | switch (sk->sk_family) { | |
713 | case AF_INET: | |
714 | ret_val = cipso_v4_sock_getattr(sk, secattr); | |
715 | break; | |
716 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
717 | case AF_INET6: | |
718 | ret_val = -ENOMSG; | |
719 | break; | |
720 | #endif /* IPv6 */ | |
721 | default: | |
722 | ret_val = -EPROTONOSUPPORT; | |
723 | } | |
724 | ||
725 | return ret_val; | |
14a72f53 PM |
726 | } |
727 | ||
014ab19a PM |
728 | /** |
729 | * netlbl_conn_setattr - Label a connected socket using the correct protocol | |
730 | * @sk: the socket to label | |
731 | * @addr: the destination address | |
732 | * @secattr: the security attributes | |
733 | * | |
734 | * Description: | |
735 | * Attach the correct label to the given connected socket using the security | |
736 | * attributes specified in @secattr. The caller is responsible for ensuring | |
737 | * that @sk is locked. Returns zero on success, negative values on failure. | |
738 | * | |
739 | */ | |
740 | int netlbl_conn_setattr(struct sock *sk, | |
741 | struct sockaddr *addr, | |
742 | const struct netlbl_lsm_secattr *secattr) | |
743 | { | |
744 | int ret_val; | |
745 | struct sockaddr_in *addr4; | |
746 | struct netlbl_domaddr4_map *af4_entry; | |
747 | ||
748 | rcu_read_lock(); | |
749 | switch (addr->sa_family) { | |
750 | case AF_INET: | |
751 | addr4 = (struct sockaddr_in *)addr; | |
752 | af4_entry = netlbl_domhsh_getentry_af4(secattr->domain, | |
753 | addr4->sin_addr.s_addr); | |
754 | if (af4_entry == NULL) { | |
755 | ret_val = -ENOENT; | |
756 | goto conn_setattr_return; | |
757 | } | |
758 | switch (af4_entry->type) { | |
759 | case NETLBL_NLTYPE_CIPSOV4: | |
760 | ret_val = cipso_v4_sock_setattr(sk, | |
761 | af4_entry->type_def.cipsov4, | |
762 | secattr); | |
763 | break; | |
764 | case NETLBL_NLTYPE_UNLABELED: | |
765 | /* just delete the protocols we support for right now | |
766 | * but we could remove other protocols if needed */ | |
767 | cipso_v4_sock_delattr(sk); | |
768 | ret_val = 0; | |
769 | break; | |
770 | default: | |
771 | ret_val = -ENOENT; | |
772 | } | |
773 | break; | |
774 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
775 | case AF_INET6: | |
776 | /* since we don't support any IPv6 labeling protocols right | |
777 | * now we can optimize everything away until we do */ | |
778 | ret_val = 0; | |
779 | break; | |
780 | #endif /* IPv6 */ | |
781 | default: | |
389fb800 | 782 | ret_val = -EPROTONOSUPPORT; |
014ab19a PM |
783 | } |
784 | ||
785 | conn_setattr_return: | |
786 | rcu_read_unlock(); | |
787 | return ret_val; | |
788 | } | |
789 | ||
389fb800 PM |
790 | /** |
791 | * netlbl_req_setattr - Label a request socket using the correct protocol | |
792 | * @req: the request socket to label | |
793 | * @secattr: the security attributes | |
794 | * | |
795 | * Description: | |
796 | * Attach the correct label to the given socket using the security attributes | |
797 | * specified in @secattr. Returns zero on success, negative values on failure. | |
798 | * | |
799 | */ | |
800 | int netlbl_req_setattr(struct request_sock *req, | |
801 | const struct netlbl_lsm_secattr *secattr) | |
802 | { | |
803 | int ret_val; | |
804 | struct netlbl_dom_map *dom_entry; | |
805 | struct netlbl_domaddr4_map *af4_entry; | |
806 | u32 proto_type; | |
807 | struct cipso_v4_doi *proto_cv4; | |
808 | ||
809 | rcu_read_lock(); | |
810 | dom_entry = netlbl_domhsh_getentry(secattr->domain); | |
811 | if (dom_entry == NULL) { | |
812 | ret_val = -ENOENT; | |
813 | goto req_setattr_return; | |
814 | } | |
815 | switch (req->rsk_ops->family) { | |
816 | case AF_INET: | |
817 | if (dom_entry->type == NETLBL_NLTYPE_ADDRSELECT) { | |
818 | struct inet_request_sock *req_inet = inet_rsk(req); | |
819 | af4_entry = netlbl_domhsh_getentry_af4(secattr->domain, | |
820 | req_inet->rmt_addr); | |
821 | if (af4_entry == NULL) { | |
822 | ret_val = -ENOENT; | |
823 | goto req_setattr_return; | |
824 | } | |
825 | proto_type = af4_entry->type; | |
826 | proto_cv4 = af4_entry->type_def.cipsov4; | |
827 | } else { | |
828 | proto_type = dom_entry->type; | |
829 | proto_cv4 = dom_entry->type_def.cipsov4; | |
830 | } | |
831 | switch (proto_type) { | |
832 | case NETLBL_NLTYPE_CIPSOV4: | |
833 | ret_val = cipso_v4_req_setattr(req, proto_cv4, secattr); | |
834 | break; | |
835 | case NETLBL_NLTYPE_UNLABELED: | |
836 | /* just delete the protocols we support for right now | |
837 | * but we could remove other protocols if needed */ | |
838 | cipso_v4_req_delattr(req); | |
839 | ret_val = 0; | |
840 | break; | |
841 | default: | |
842 | ret_val = -ENOENT; | |
843 | } | |
844 | break; | |
845 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
846 | case AF_INET6: | |
847 | /* since we don't support any IPv6 labeling protocols right | |
848 | * now we can optimize everything away until we do */ | |
849 | ret_val = 0; | |
850 | break; | |
851 | #endif /* IPv6 */ | |
852 | default: | |
853 | ret_val = -EPROTONOSUPPORT; | |
854 | } | |
855 | ||
856 | req_setattr_return: | |
857 | rcu_read_unlock(); | |
858 | return ret_val; | |
859 | } | |
860 | ||
07feee8f PM |
861 | /** |
862 | * netlbl_req_delattr - Delete all the NetLabel labels on a socket | |
863 | * @req: the socket | |
864 | * | |
865 | * Description: | |
866 | * Remove all the NetLabel labeling from @req. | |
867 | * | |
868 | */ | |
869 | void netlbl_req_delattr(struct request_sock *req) | |
870 | { | |
871 | cipso_v4_req_delattr(req); | |
872 | } | |
873 | ||
948bf85c PM |
874 | /** |
875 | * netlbl_skbuff_setattr - Label a packet using the correct protocol | |
876 | * @skb: the packet | |
877 | * @family: protocol family | |
878 | * @secattr: the security attributes | |
879 | * | |
880 | * Description: | |
881 | * Attach the correct label to the given packet using the security attributes | |
882 | * specified in @secattr. Returns zero on success, negative values on failure. | |
883 | * | |
884 | */ | |
885 | int netlbl_skbuff_setattr(struct sk_buff *skb, | |
886 | u16 family, | |
887 | const struct netlbl_lsm_secattr *secattr) | |
888 | { | |
889 | int ret_val; | |
890 | struct iphdr *hdr4; | |
891 | struct netlbl_domaddr4_map *af4_entry; | |
892 | ||
893 | rcu_read_lock(); | |
894 | switch (family) { | |
895 | case AF_INET: | |
896 | hdr4 = ip_hdr(skb); | |
897 | af4_entry = netlbl_domhsh_getentry_af4(secattr->domain, | |
898 | hdr4->daddr); | |
899 | if (af4_entry == NULL) { | |
900 | ret_val = -ENOENT; | |
901 | goto skbuff_setattr_return; | |
902 | } | |
903 | switch (af4_entry->type) { | |
904 | case NETLBL_NLTYPE_CIPSOV4: | |
905 | ret_val = cipso_v4_skbuff_setattr(skb, | |
906 | af4_entry->type_def.cipsov4, | |
907 | secattr); | |
908 | break; | |
909 | case NETLBL_NLTYPE_UNLABELED: | |
910 | /* just delete the protocols we support for right now | |
911 | * but we could remove other protocols if needed */ | |
912 | ret_val = cipso_v4_skbuff_delattr(skb); | |
913 | break; | |
914 | default: | |
915 | ret_val = -ENOENT; | |
916 | } | |
917 | break; | |
918 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
919 | case AF_INET6: | |
920 | /* since we don't support any IPv6 labeling protocols right | |
921 | * now we can optimize everything away until we do */ | |
922 | ret_val = 0; | |
923 | break; | |
924 | #endif /* IPv6 */ | |
925 | default: | |
389fb800 | 926 | ret_val = -EPROTONOSUPPORT; |
948bf85c PM |
927 | } |
928 | ||
929 | skbuff_setattr_return: | |
930 | rcu_read_unlock(); | |
931 | return ret_val; | |
932 | } | |
933 | ||
d15c345f PM |
934 | /** |
935 | * netlbl_skbuff_getattr - Determine the security attributes of a packet | |
936 | * @skb: the packet | |
75e22910 | 937 | * @family: protocol family |
d15c345f PM |
938 | * @secattr: the security attributes |
939 | * | |
940 | * Description: | |
941 | * Examines the given packet to see if a recognized form of packet labeling | |
942 | * is present, if so it parses the packet label and returns the security | |
943 | * attributes in @secattr. Returns zero on success, negative values on | |
944 | * failure. | |
945 | * | |
946 | */ | |
947 | int netlbl_skbuff_getattr(const struct sk_buff *skb, | |
75e22910 | 948 | u16 family, |
d15c345f PM |
949 | struct netlbl_lsm_secattr *secattr) |
950 | { | |
389fb800 PM |
951 | switch (family) { |
952 | case AF_INET: | |
953 | if (CIPSO_V4_OPTEXIST(skb) && | |
954 | cipso_v4_skbuff_getattr(skb, secattr) == 0) | |
955 | return 0; | |
956 | break; | |
957 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
958 | case AF_INET6: | |
959 | break; | |
960 | #endif /* IPv6 */ | |
961 | } | |
d15c345f | 962 | |
8cc44579 | 963 | return netlbl_unlabel_getattr(skb, family, secattr); |
d15c345f PM |
964 | } |
965 | ||
966 | /** | |
967 | * netlbl_skbuff_err - Handle a LSM error on a sk_buff | |
968 | * @skb: the packet | |
969 | * @error: the error code | |
dfaebe98 | 970 | * @gateway: true if host is acting as a gateway, false otherwise |
d15c345f PM |
971 | * |
972 | * Description: | |
973 | * Deal with a LSM problem when handling the packet in @skb, typically this is | |
974 | * a permission denied problem (-EACCES). The correct action is determined | |
975 | * according to the packet's labeling protocol. | |
976 | * | |
977 | */ | |
dfaebe98 | 978 | void netlbl_skbuff_err(struct sk_buff *skb, int error, int gateway) |
d15c345f PM |
979 | { |
980 | if (CIPSO_V4_OPTEXIST(skb)) | |
dfaebe98 | 981 | cipso_v4_error(skb, error, gateway); |
d15c345f PM |
982 | } |
983 | ||
984 | /** | |
985 | * netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches | |
986 | * | |
987 | * Description: | |
988 | * For all of the NetLabel protocols that support some form of label mapping | |
989 | * cache, invalidate the cache. Returns zero on success, negative values on | |
990 | * error. | |
991 | * | |
992 | */ | |
993 | void netlbl_cache_invalidate(void) | |
994 | { | |
995 | cipso_v4_cache_invalidate(); | |
996 | } | |
997 | ||
998 | /** | |
999 | * netlbl_cache_add - Add an entry to a NetLabel protocol cache | |
1000 | * @skb: the packet | |
1001 | * @secattr: the packet's security attributes | |
1002 | * | |
1003 | * Description: | |
1004 | * Add the LSM security attributes for the given packet to the underlying | |
1005 | * NetLabel protocol's label mapping cache. Returns zero on success, negative | |
1006 | * values on error. | |
1007 | * | |
1008 | */ | |
1009 | int netlbl_cache_add(const struct sk_buff *skb, | |
1010 | const struct netlbl_lsm_secattr *secattr) | |
1011 | { | |
701a90ba | 1012 | if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0) |
d15c345f PM |
1013 | return -ENOMSG; |
1014 | ||
1015 | if (CIPSO_V4_OPTEXIST(skb)) | |
1016 | return cipso_v4_cache_add(skb, secattr); | |
1017 | ||
1018 | return -ENOMSG; | |
1019 | } | |
1020 | ||
6c2e8ac0 PM |
1021 | /* |
1022 | * Protocol Engine Functions | |
1023 | */ | |
1024 | ||
1025 | /** | |
1026 | * netlbl_audit_start - Start an audit message | |
1027 | * @type: audit message type | |
1028 | * @audit_info: NetLabel audit information | |
1029 | * | |
1030 | * Description: | |
1031 | * Start an audit message using the type specified in @type and fill the audit | |
1032 | * message with some fields common to all NetLabel audit messages. This | |
1033 | * function should only be used by protocol engines, not LSMs. Returns a | |
1034 | * pointer to the audit buffer on success, NULL on failure. | |
1035 | * | |
1036 | */ | |
1037 | struct audit_buffer *netlbl_audit_start(int type, | |
1038 | struct netlbl_audit *audit_info) | |
1039 | { | |
1040 | return netlbl_audit_start_common(type, audit_info); | |
1041 | } | |
1042 | ||
d15c345f PM |
1043 | /* |
1044 | * Setup Functions | |
1045 | */ | |
1046 | ||
1047 | /** | |
1048 | * netlbl_init - Initialize NetLabel | |
1049 | * | |
1050 | * Description: | |
1051 | * Perform the required NetLabel initialization before first use. | |
1052 | * | |
1053 | */ | |
1054 | static int __init netlbl_init(void) | |
1055 | { | |
1056 | int ret_val; | |
1057 | ||
1058 | printk(KERN_INFO "NetLabel: Initializing\n"); | |
1059 | printk(KERN_INFO "NetLabel: domain hash size = %u\n", | |
1060 | (1 << NETLBL_DOMHSH_BITSIZE)); | |
1061 | printk(KERN_INFO "NetLabel: protocols =" | |
1062 | " UNLABELED" | |
1063 | " CIPSOv4" | |
1064 | "\n"); | |
1065 | ||
1066 | ret_val = netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE); | |
1067 | if (ret_val != 0) | |
1068 | goto init_failure; | |
1069 | ||
8cc44579 PM |
1070 | ret_val = netlbl_unlabel_init(NETLBL_UNLHSH_BITSIZE); |
1071 | if (ret_val != 0) | |
1072 | goto init_failure; | |
1073 | ||
d15c345f PM |
1074 | ret_val = netlbl_netlink_init(); |
1075 | if (ret_val != 0) | |
1076 | goto init_failure; | |
1077 | ||
1078 | ret_val = netlbl_unlabel_defconf(); | |
1079 | if (ret_val != 0) | |
1080 | goto init_failure; | |
1081 | printk(KERN_INFO "NetLabel: unlabeled traffic allowed by default\n"); | |
1082 | ||
1083 | return 0; | |
1084 | ||
1085 | init_failure: | |
1086 | panic("NetLabel: failed to initialize properly (%d)\n", ret_val); | |
1087 | } | |
1088 | ||
1089 | subsys_initcall(netlbl_init); |