Commit | Line | Data |
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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 | * | |
82c21bfa | 8 | * Author: Paul Moore <paul@paul-moore.com> |
d15c345f PM |
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 | |
d484ff15 | 26 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
d15c345f PM |
27 | * |
28 | */ | |
29 | ||
30 | #include <linux/init.h> | |
31 | #include <linux/types.h> | |
5a0e3ad6 | 32 | #include <linux/slab.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> | |
60063497 | 41 | #include <linux/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 | 74 | if (addr == NULL && mask == NULL) { |
8f18e675 | 75 | return netlbl_domhsh_remove(domain, family, audit_info); |
6c2e8ac0 PM |
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; | |
eda61d32 PM |
113 | |
114 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); | |
115 | if (entry == NULL) | |
948a7243 | 116 | return -ENOMEM; |
eda61d32 PM |
117 | if (domain != NULL) { |
118 | entry->domain = kstrdup(domain, GFP_ATOMIC); | |
119 | if (entry->domain == NULL) | |
6c2e8ac0 PM |
120 | goto cfg_unlbl_map_add_failure; |
121 | } | |
8f18e675 | 122 | entry->family = family; |
6c2e8ac0 PM |
123 | |
124 | if (addr == NULL && mask == NULL) | |
6a8b7f0c | 125 | entry->def.type = NETLBL_NLTYPE_UNLABELED; |
6c2e8ac0 PM |
126 | else if (addr != NULL && mask != NULL) { |
127 | addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC); | |
128 | if (addrmap == NULL) | |
129 | goto cfg_unlbl_map_add_failure; | |
130 | INIT_LIST_HEAD(&addrmap->list4); | |
131 | INIT_LIST_HEAD(&addrmap->list6); | |
132 | ||
133 | switch (family) { | |
1281bc25 PM |
134 | case AF_INET: { |
135 | const struct in_addr *addr4 = addr; | |
136 | const struct in_addr *mask4 = mask; | |
6c2e8ac0 PM |
137 | map4 = kzalloc(sizeof(*map4), GFP_ATOMIC); |
138 | if (map4 == NULL) | |
139 | goto cfg_unlbl_map_add_failure; | |
6a8b7f0c | 140 | map4->def.type = NETLBL_NLTYPE_UNLABELED; |
6c2e8ac0 PM |
141 | map4->list.addr = addr4->s_addr & mask4->s_addr; |
142 | map4->list.mask = mask4->s_addr; | |
143 | map4->list.valid = 1; | |
144 | ret_val = netlbl_af4list_add(&map4->list, | |
145 | &addrmap->list4); | |
146 | if (ret_val != 0) | |
147 | goto cfg_unlbl_map_add_failure; | |
148 | break; | |
1281bc25 | 149 | } |
dfd56b8b | 150 | #if IS_ENABLED(CONFIG_IPV6) |
1281bc25 PM |
151 | case AF_INET6: { |
152 | const struct in6_addr *addr6 = addr; | |
153 | const struct in6_addr *mask6 = mask; | |
6c2e8ac0 | 154 | map6 = kzalloc(sizeof(*map6), GFP_ATOMIC); |
ca7daea6 | 155 | if (map6 == NULL) |
6c2e8ac0 | 156 | goto cfg_unlbl_map_add_failure; |
6a8b7f0c | 157 | map6->def.type = NETLBL_NLTYPE_UNLABELED; |
4e3fd7a0 | 158 | map6->list.addr = *addr6; |
6c2e8ac0 PM |
159 | map6->list.addr.s6_addr32[0] &= mask6->s6_addr32[0]; |
160 | map6->list.addr.s6_addr32[1] &= mask6->s6_addr32[1]; | |
161 | map6->list.addr.s6_addr32[2] &= mask6->s6_addr32[2]; | |
162 | map6->list.addr.s6_addr32[3] &= mask6->s6_addr32[3]; | |
4e3fd7a0 | 163 | map6->list.mask = *mask6; |
6c2e8ac0 | 164 | map6->list.valid = 1; |
42ca0203 DC |
165 | ret_val = netlbl_af6list_add(&map6->list, |
166 | &addrmap->list6); | |
6c2e8ac0 PM |
167 | if (ret_val != 0) |
168 | goto cfg_unlbl_map_add_failure; | |
169 | break; | |
1281bc25 PM |
170 | } |
171 | #endif /* IPv6 */ | |
6c2e8ac0 PM |
172 | default: |
173 | goto cfg_unlbl_map_add_failure; | |
6c2e8ac0 PM |
174 | } |
175 | ||
6a8b7f0c PM |
176 | entry->def.addrsel = addrmap; |
177 | entry->def.type = NETLBL_NLTYPE_ADDRSELECT; | |
6c2e8ac0 PM |
178 | } else { |
179 | ret_val = -EINVAL; | |
180 | goto cfg_unlbl_map_add_failure; | |
eda61d32 | 181 | } |
eda61d32 PM |
182 | |
183 | ret_val = netlbl_domhsh_add(entry, audit_info); | |
184 | if (ret_val != 0) | |
6c2e8ac0 | 185 | goto cfg_unlbl_map_add_failure; |
eda61d32 PM |
186 | |
187 | return 0; | |
188 | ||
6c2e8ac0 | 189 | cfg_unlbl_map_add_failure: |
47943234 | 190 | kfree(entry->domain); |
eda61d32 | 191 | kfree(entry); |
6c2e8ac0 PM |
192 | kfree(addrmap); |
193 | kfree(map4); | |
194 | kfree(map6); | |
eda61d32 PM |
195 | return ret_val; |
196 | } | |
197 | ||
6c2e8ac0 PM |
198 | |
199 | /** | |
200 | * netlbl_cfg_unlbl_static_add - Adds a new static label | |
201 | * @net: network namespace | |
202 | * @dev_name: interface name | |
203 | * @addr: IP address in network byte order (struct in[6]_addr) | |
204 | * @mask: address mask in network byte order (struct in[6]_addr) | |
205 | * @family: address family | |
206 | * @secid: LSM secid value for the entry | |
207 | * @audit_info: NetLabel audit information | |
208 | * | |
209 | * Description: | |
210 | * Adds a new NetLabel static label to be used when protocol provided labels | |
211 | * are not present on incoming traffic. If @dev_name is NULL then the default | |
212 | * interface will be used. Returns zero on success, negative values on failure. | |
213 | * | |
214 | */ | |
215 | int netlbl_cfg_unlbl_static_add(struct net *net, | |
216 | const char *dev_name, | |
217 | const void *addr, | |
218 | const void *mask, | |
219 | u16 family, | |
220 | u32 secid, | |
221 | struct netlbl_audit *audit_info) | |
222 | { | |
223 | u32 addr_len; | |
224 | ||
225 | switch (family) { | |
226 | case AF_INET: | |
227 | addr_len = sizeof(struct in_addr); | |
228 | break; | |
dfd56b8b | 229 | #if IS_ENABLED(CONFIG_IPV6) |
6c2e8ac0 PM |
230 | case AF_INET6: |
231 | addr_len = sizeof(struct in6_addr); | |
232 | break; | |
1281bc25 | 233 | #endif /* IPv6 */ |
6c2e8ac0 PM |
234 | default: |
235 | return -EPFNOSUPPORT; | |
236 | } | |
237 | ||
238 | return netlbl_unlhsh_add(net, | |
239 | dev_name, addr, mask, addr_len, | |
240 | secid, audit_info); | |
241 | } | |
242 | ||
243 | /** | |
244 | * netlbl_cfg_unlbl_static_del - Removes an existing static label | |
245 | * @net: network namespace | |
246 | * @dev_name: interface name | |
247 | * @addr: IP address in network byte order (struct in[6]_addr) | |
248 | * @mask: address mask in network byte order (struct in[6]_addr) | |
249 | * @family: address family | |
6c2e8ac0 PM |
250 | * @audit_info: NetLabel audit information |
251 | * | |
252 | * Description: | |
253 | * Removes an existing NetLabel static label used when protocol provided labels | |
254 | * are not present on incoming traffic. If @dev_name is NULL then the default | |
255 | * interface will be used. Returns zero on success, negative values on failure. | |
256 | * | |
257 | */ | |
258 | int netlbl_cfg_unlbl_static_del(struct net *net, | |
259 | const char *dev_name, | |
260 | const void *addr, | |
261 | const void *mask, | |
262 | u16 family, | |
263 | struct netlbl_audit *audit_info) | |
264 | { | |
265 | u32 addr_len; | |
266 | ||
267 | switch (family) { | |
268 | case AF_INET: | |
269 | addr_len = sizeof(struct in_addr); | |
270 | break; | |
dfd56b8b | 271 | #if IS_ENABLED(CONFIG_IPV6) |
6c2e8ac0 PM |
272 | case AF_INET6: |
273 | addr_len = sizeof(struct in6_addr); | |
274 | break; | |
1281bc25 | 275 | #endif /* IPv6 */ |
6c2e8ac0 PM |
276 | default: |
277 | return -EPFNOSUPPORT; | |
278 | } | |
279 | ||
280 | return netlbl_unlhsh_remove(net, | |
281 | dev_name, addr, mask, addr_len, | |
282 | audit_info); | |
283 | } | |
284 | ||
285 | /** | |
286 | * netlbl_cfg_cipsov4_add - Add a new CIPSOv4 DOI definition | |
287 | * @doi_def: CIPSO DOI definition | |
288 | * @audit_info: NetLabel audit information | |
289 | * | |
290 | * Description: | |
291 | * Add a new CIPSO DOI definition as defined by @doi_def. Returns zero on | |
292 | * success and negative values on failure. | |
293 | * | |
294 | */ | |
295 | int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def, | |
296 | struct netlbl_audit *audit_info) | |
297 | { | |
298 | return cipso_v4_doi_add(doi_def, audit_info); | |
299 | } | |
300 | ||
301 | /** | |
302 | * netlbl_cfg_cipsov4_del - Remove an existing CIPSOv4 DOI definition | |
303 | * @doi: CIPSO DOI | |
304 | * @audit_info: NetLabel audit information | |
305 | * | |
306 | * Description: | |
307 | * Remove an existing CIPSO DOI definition matching @doi. Returns zero on | |
308 | * success and negative values on failure. | |
309 | * | |
310 | */ | |
311 | void netlbl_cfg_cipsov4_del(u32 doi, struct netlbl_audit *audit_info) | |
312 | { | |
313 | cipso_v4_doi_remove(doi, audit_info); | |
314 | } | |
315 | ||
eda61d32 | 316 | /** |
6c2e8ac0 PM |
317 | * netlbl_cfg_cipsov4_map_add - Add a new CIPSOv4 DOI mapping |
318 | * @doi: the CIPSO DOI | |
eda61d32 | 319 | * @domain: the domain mapping to add |
6c2e8ac0 PM |
320 | * @addr: IP address |
321 | * @mask: IP address mask | |
eda61d32 PM |
322 | * @audit_info: NetLabel audit information |
323 | * | |
324 | * Description: | |
6c2e8ac0 PM |
325 | * Add a new NetLabel/LSM domain mapping for the given CIPSO DOI to the NetLabel |
326 | * subsystem. A @domain value of NULL adds a new default domain mapping. | |
327 | * Returns zero on success, negative values on failure. | |
eda61d32 PM |
328 | * |
329 | */ | |
6c2e8ac0 | 330 | int netlbl_cfg_cipsov4_map_add(u32 doi, |
eda61d32 | 331 | const char *domain, |
6c2e8ac0 PM |
332 | const struct in_addr *addr, |
333 | const struct in_addr *mask, | |
eda61d32 PM |
334 | struct netlbl_audit *audit_info) |
335 | { | |
336 | int ret_val = -ENOMEM; | |
6c2e8ac0 | 337 | struct cipso_v4_doi *doi_def; |
eda61d32 | 338 | struct netlbl_dom_map *entry; |
6c2e8ac0 PM |
339 | struct netlbl_domaddr_map *addrmap = NULL; |
340 | struct netlbl_domaddr4_map *addrinfo = NULL; | |
eda61d32 | 341 | |
6c2e8ac0 PM |
342 | doi_def = cipso_v4_doi_getdef(doi); |
343 | if (doi_def == NULL) | |
344 | return -ENOENT; | |
b1edeb10 | 345 | |
eda61d32 PM |
346 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); |
347 | if (entry == NULL) | |
94a80d63 | 348 | goto out_entry; |
8f18e675 | 349 | entry->family = AF_INET; |
eda61d32 PM |
350 | if (domain != NULL) { |
351 | entry->domain = kstrdup(domain, GFP_ATOMIC); | |
352 | if (entry->domain == NULL) | |
94a80d63 | 353 | goto out_domain; |
eda61d32 | 354 | } |
eda61d32 | 355 | |
6c2e8ac0 | 356 | if (addr == NULL && mask == NULL) { |
6a8b7f0c PM |
357 | entry->def.cipso = doi_def; |
358 | entry->def.type = NETLBL_NLTYPE_CIPSOV4; | |
6c2e8ac0 PM |
359 | } else if (addr != NULL && mask != NULL) { |
360 | addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC); | |
361 | if (addrmap == NULL) | |
94a80d63 | 362 | goto out_addrmap; |
6c2e8ac0 PM |
363 | INIT_LIST_HEAD(&addrmap->list4); |
364 | INIT_LIST_HEAD(&addrmap->list6); | |
365 | ||
366 | addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC); | |
367 | if (addrinfo == NULL) | |
94a80d63 | 368 | goto out_addrinfo; |
6a8b7f0c PM |
369 | addrinfo->def.cipso = doi_def; |
370 | addrinfo->def.type = NETLBL_NLTYPE_CIPSOV4; | |
6c2e8ac0 PM |
371 | addrinfo->list.addr = addr->s_addr & mask->s_addr; |
372 | addrinfo->list.mask = mask->s_addr; | |
373 | addrinfo->list.valid = 1; | |
374 | ret_val = netlbl_af4list_add(&addrinfo->list, &addrmap->list4); | |
375 | if (ret_val != 0) | |
376 | goto cfg_cipsov4_map_add_failure; | |
377 | ||
6a8b7f0c PM |
378 | entry->def.addrsel = addrmap; |
379 | entry->def.type = NETLBL_NLTYPE_ADDRSELECT; | |
6c2e8ac0 PM |
380 | } else { |
381 | ret_val = -EINVAL; | |
94a80d63 | 382 | goto out_addrmap; |
b1edeb10 | 383 | } |
6c2e8ac0 | 384 | |
eda61d32 PM |
385 | ret_val = netlbl_domhsh_add(entry, audit_info); |
386 | if (ret_val != 0) | |
6c2e8ac0 | 387 | goto cfg_cipsov4_map_add_failure; |
b1edeb10 | 388 | |
6c2e8ac0 | 389 | return 0; |
b1edeb10 | 390 | |
6c2e8ac0 | 391 | cfg_cipsov4_map_add_failure: |
94a80d63 JL |
392 | kfree(addrinfo); |
393 | out_addrinfo: | |
394 | kfree(addrmap); | |
395 | out_addrmap: | |
47943234 | 396 | kfree(entry->domain); |
94a80d63 | 397 | out_domain: |
eda61d32 | 398 | kfree(entry); |
94a80d63 JL |
399 | out_entry: |
400 | cipso_v4_doi_putdef(doi_def); | |
6c2e8ac0 | 401 | return ret_val; |
eda61d32 PM |
402 | } |
403 | ||
02752760 PM |
404 | /* |
405 | * Security Attribute Functions | |
406 | */ | |
407 | ||
4b8feff2 PM |
408 | #define _CM_F_NONE 0x00000000 |
409 | #define _CM_F_ALLOC 0x00000001 | |
d960a618 | 410 | #define _CM_F_WALK 0x00000002 |
4b8feff2 PM |
411 | |
412 | /** | |
4fbe63d1 | 413 | * _netlbl_catmap_getnode - Get a individual node from a catmap |
4b8feff2 PM |
414 | * @catmap: pointer to the category bitmap |
415 | * @offset: the requested offset | |
416 | * @cm_flags: catmap flags, see _CM_F_* | |
417 | * @gfp_flags: memory allocation flags | |
418 | * | |
419 | * Description: | |
d960a618 PM |
420 | * Iterate through the catmap looking for the node associated with @offset. |
421 | * If the _CM_F_ALLOC flag is set in @cm_flags and there is no associated node, | |
422 | * one will be created and inserted into the catmap. If the _CM_F_WALK flag is | |
423 | * set in @cm_flags and there is no associated node, the next highest node will | |
424 | * be returned. Returns a pointer to the node on success, NULL on failure. | |
4b8feff2 PM |
425 | * |
426 | */ | |
4fbe63d1 PM |
427 | static struct netlbl_lsm_catmap *_netlbl_catmap_getnode( |
428 | struct netlbl_lsm_catmap **catmap, | |
429 | u32 offset, | |
430 | unsigned int cm_flags, | |
431 | gfp_t gfp_flags) | |
4b8feff2 | 432 | { |
4fbe63d1 PM |
433 | struct netlbl_lsm_catmap *iter = *catmap; |
434 | struct netlbl_lsm_catmap *prev = NULL; | |
4b8feff2 | 435 | |
d960a618 | 436 | if (iter == NULL) |
4fbe63d1 | 437 | goto catmap_getnode_alloc; |
d960a618 | 438 | if (offset < iter->startbit) |
4fbe63d1 | 439 | goto catmap_getnode_walk; |
4b8feff2 PM |
440 | while (iter && offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) { |
441 | prev = iter; | |
442 | iter = iter->next; | |
443 | } | |
444 | if (iter == NULL || offset < iter->startbit) | |
4fbe63d1 | 445 | goto catmap_getnode_walk; |
4b8feff2 PM |
446 | |
447 | return iter; | |
448 | ||
4fbe63d1 | 449 | catmap_getnode_walk: |
d960a618 PM |
450 | if (cm_flags & _CM_F_WALK) |
451 | return iter; | |
4fbe63d1 | 452 | catmap_getnode_alloc: |
4b8feff2 PM |
453 | if (!(cm_flags & _CM_F_ALLOC)) |
454 | return NULL; | |
455 | ||
4fbe63d1 | 456 | iter = netlbl_catmap_alloc(gfp_flags); |
4b8feff2 PM |
457 | if (iter == NULL) |
458 | return NULL; | |
459 | iter->startbit = offset & ~(NETLBL_CATMAP_SIZE - 1); | |
460 | ||
461 | if (prev == NULL) { | |
462 | iter->next = *catmap; | |
463 | *catmap = iter; | |
464 | } else { | |
465 | iter->next = prev->next; | |
466 | prev->next = iter; | |
467 | } | |
468 | ||
469 | return iter; | |
470 | } | |
471 | ||
02752760 | 472 | /** |
4fbe63d1 | 473 | * netlbl_catmap_walk - Walk a LSM secattr catmap looking for a bit |
02752760 PM |
474 | * @catmap: the category bitmap |
475 | * @offset: the offset to start searching at, in bits | |
476 | * | |
477 | * Description: | |
478 | * This function walks a LSM secattr category bitmap starting at @offset and | |
479 | * returns the spot of the first set bit or -ENOENT if no bits are set. | |
480 | * | |
481 | */ | |
4fbe63d1 | 482 | int netlbl_catmap_walk(struct netlbl_lsm_catmap *catmap, u32 offset) |
02752760 | 483 | { |
4fbe63d1 | 484 | struct netlbl_lsm_catmap *iter = catmap; |
d960a618 PM |
485 | u32 idx; |
486 | u32 bit; | |
02752760 PM |
487 | NETLBL_CATMAP_MAPTYPE bitmap; |
488 | ||
4fbe63d1 | 489 | iter = _netlbl_catmap_getnode(&catmap, offset, _CM_F_WALK, 0); |
d960a618 PM |
490 | if (iter == NULL) |
491 | return -ENOENT; | |
02752760 | 492 | if (offset > iter->startbit) { |
d960a618 PM |
493 | offset -= iter->startbit; |
494 | idx = offset / NETLBL_CATMAP_MAPSIZE; | |
495 | bit = offset % NETLBL_CATMAP_MAPSIZE; | |
02752760 | 496 | } else { |
d960a618 PM |
497 | idx = 0; |
498 | bit = 0; | |
02752760 | 499 | } |
d960a618 | 500 | bitmap = iter->bitmap[idx] >> bit; |
02752760 PM |
501 | |
502 | for (;;) { | |
503 | if (bitmap != 0) { | |
504 | while ((bitmap & NETLBL_CATMAP_BIT) == 0) { | |
505 | bitmap >>= 1; | |
d960a618 | 506 | bit++; |
02752760 PM |
507 | } |
508 | return iter->startbit + | |
d960a618 | 509 | (NETLBL_CATMAP_MAPSIZE * idx) + bit; |
02752760 | 510 | } |
d960a618 | 511 | if (++idx >= NETLBL_CATMAP_MAPCNT) { |
02752760 PM |
512 | if (iter->next != NULL) { |
513 | iter = iter->next; | |
d960a618 | 514 | idx = 0; |
02752760 PM |
515 | } else |
516 | return -ENOENT; | |
517 | } | |
d960a618 PM |
518 | bitmap = iter->bitmap[idx]; |
519 | bit = 0; | |
02752760 PM |
520 | } |
521 | ||
522 | return -ENOENT; | |
523 | } | |
524 | ||
525 | /** | |
4fbe63d1 | 526 | * netlbl_catmap_walkrng - Find the end of a string of set bits |
02752760 PM |
527 | * @catmap: the category bitmap |
528 | * @offset: the offset to start searching at, in bits | |
529 | * | |
530 | * Description: | |
531 | * This function walks a LSM secattr category bitmap starting at @offset and | |
532 | * returns the spot of the first cleared bit or -ENOENT if the offset is past | |
533 | * the end of the bitmap. | |
534 | * | |
535 | */ | |
4fbe63d1 | 536 | int netlbl_catmap_walkrng(struct netlbl_lsm_catmap *catmap, u32 offset) |
02752760 | 537 | { |
4fbe63d1 PM |
538 | struct netlbl_lsm_catmap *iter; |
539 | struct netlbl_lsm_catmap *prev = NULL; | |
d960a618 PM |
540 | u32 idx; |
541 | u32 bit; | |
02752760 PM |
542 | NETLBL_CATMAP_MAPTYPE bitmask; |
543 | NETLBL_CATMAP_MAPTYPE bitmap; | |
544 | ||
4fbe63d1 | 545 | iter = _netlbl_catmap_getnode(&catmap, offset, _CM_F_WALK, 0); |
d960a618 PM |
546 | if (iter == NULL) |
547 | return -ENOENT; | |
02752760 | 548 | if (offset > iter->startbit) { |
d960a618 PM |
549 | offset -= iter->startbit; |
550 | idx = offset / NETLBL_CATMAP_MAPSIZE; | |
551 | bit = offset % NETLBL_CATMAP_MAPSIZE; | |
02752760 | 552 | } else { |
d960a618 PM |
553 | idx = 0; |
554 | bit = 0; | |
02752760 | 555 | } |
d960a618 | 556 | bitmask = NETLBL_CATMAP_BIT << bit; |
02752760 PM |
557 | |
558 | for (;;) { | |
d960a618 | 559 | bitmap = iter->bitmap[idx]; |
02752760 PM |
560 | while (bitmask != 0 && (bitmap & bitmask) != 0) { |
561 | bitmask <<= 1; | |
d960a618 | 562 | bit++; |
02752760 PM |
563 | } |
564 | ||
d960a618 PM |
565 | if (prev && idx == 0 && bit == 0) |
566 | return prev->startbit + NETLBL_CATMAP_SIZE - 1; | |
567 | else if (bitmask != 0) | |
02752760 | 568 | return iter->startbit + |
d960a618 PM |
569 | (NETLBL_CATMAP_MAPSIZE * idx) + bit - 1; |
570 | else if (++idx >= NETLBL_CATMAP_MAPCNT) { | |
02752760 | 571 | if (iter->next == NULL) |
d960a618 PM |
572 | return iter->startbit + NETLBL_CATMAP_SIZE - 1; |
573 | prev = iter; | |
02752760 | 574 | iter = iter->next; |
d960a618 | 575 | idx = 0; |
02752760 PM |
576 | } |
577 | bitmask = NETLBL_CATMAP_BIT; | |
d960a618 | 578 | bit = 0; |
02752760 PM |
579 | } |
580 | ||
581 | return -ENOENT; | |
582 | } | |
583 | ||
4b8feff2 | 584 | /** |
4fbe63d1 | 585 | * netlbl_catmap_getlong - Export an unsigned long bitmap |
4b8feff2 PM |
586 | * @catmap: pointer to the category bitmap |
587 | * @offset: pointer to the requested offset | |
588 | * @bitmap: the exported bitmap | |
589 | * | |
590 | * Description: | |
591 | * Export a bitmap with an offset greater than or equal to @offset and return | |
592 | * it in @bitmap. The @offset must be aligned to an unsigned long and will be | |
593 | * updated on return if different from what was requested; if the catmap is | |
594 | * empty at the requested offset and beyond, the @offset is set to (u32)-1. | |
595 | * Returns zero on sucess, negative values on failure. | |
596 | * | |
597 | */ | |
4fbe63d1 PM |
598 | int netlbl_catmap_getlong(struct netlbl_lsm_catmap *catmap, |
599 | u32 *offset, | |
600 | unsigned long *bitmap) | |
4b8feff2 | 601 | { |
4fbe63d1 | 602 | struct netlbl_lsm_catmap *iter; |
4b8feff2 PM |
603 | u32 off = *offset; |
604 | u32 idx; | |
605 | ||
606 | /* only allow aligned offsets */ | |
607 | if ((off & (BITS_PER_LONG - 1)) != 0) | |
608 | return -EINVAL; | |
609 | ||
610 | if (off < catmap->startbit) { | |
611 | off = catmap->startbit; | |
612 | *offset = off; | |
613 | } | |
50b8629a | 614 | iter = _netlbl_catmap_getnode(&catmap, off, _CM_F_WALK, 0); |
4b8feff2 PM |
615 | if (iter == NULL) { |
616 | *offset = (u32)-1; | |
617 | return 0; | |
618 | } | |
619 | ||
620 | if (off < iter->startbit) { | |
50b8629a PM |
621 | *offset = iter->startbit; |
622 | off = 0; | |
4b8feff2 PM |
623 | } else |
624 | off -= iter->startbit; | |
4b8feff2 | 625 | idx = off / NETLBL_CATMAP_MAPSIZE; |
50b8629a | 626 | *bitmap = iter->bitmap[idx] >> (off % NETLBL_CATMAP_MAPSIZE); |
4b8feff2 PM |
627 | |
628 | return 0; | |
629 | } | |
630 | ||
02752760 | 631 | /** |
4fbe63d1 | 632 | * netlbl_catmap_setbit - Set a bit in a LSM secattr catmap |
41c3bd20 | 633 | * @catmap: pointer to the category bitmap |
02752760 PM |
634 | * @bit: the bit to set |
635 | * @flags: memory allocation flags | |
636 | * | |
637 | * Description: | |
638 | * Set the bit specified by @bit in @catmap. Returns zero on success, | |
639 | * negative values on failure. | |
640 | * | |
641 | */ | |
4fbe63d1 PM |
642 | int netlbl_catmap_setbit(struct netlbl_lsm_catmap **catmap, |
643 | u32 bit, | |
644 | gfp_t flags) | |
02752760 | 645 | { |
4fbe63d1 | 646 | struct netlbl_lsm_catmap *iter; |
4b8feff2 | 647 | u32 idx; |
02752760 | 648 | |
4fbe63d1 | 649 | iter = _netlbl_catmap_getnode(catmap, bit, _CM_F_ALLOC, flags); |
4b8feff2 PM |
650 | if (iter == NULL) |
651 | return -ENOMEM; | |
02752760 | 652 | |
4b8feff2 PM |
653 | bit -= iter->startbit; |
654 | idx = bit / NETLBL_CATMAP_MAPSIZE; | |
655 | iter->bitmap[idx] |= NETLBL_CATMAP_BIT << (bit % NETLBL_CATMAP_MAPSIZE); | |
02752760 PM |
656 | |
657 | return 0; | |
658 | } | |
659 | ||
660 | /** | |
4fbe63d1 | 661 | * netlbl_catmap_setrng - Set a range of bits in a LSM secattr catmap |
41c3bd20 | 662 | * @catmap: pointer to the category bitmap |
02752760 PM |
663 | * @start: the starting bit |
664 | * @end: the last bit in the string | |
665 | * @flags: memory allocation flags | |
666 | * | |
667 | * Description: | |
668 | * Set a range of bits, starting at @start and ending with @end. Returns zero | |
669 | * on success, negative values on failure. | |
670 | * | |
671 | */ | |
4fbe63d1 PM |
672 | int netlbl_catmap_setrng(struct netlbl_lsm_catmap **catmap, |
673 | u32 start, | |
674 | u32 end, | |
675 | gfp_t flags) | |
02752760 | 676 | { |
4b8feff2 PM |
677 | int rc = 0; |
678 | u32 spot = start; | |
679 | ||
680 | while (rc == 0 && spot <= end) { | |
341e0cb5 | 681 | if (((spot & (BITS_PER_LONG - 1)) == 0) && |
4b8feff2 | 682 | ((end - spot) > BITS_PER_LONG)) { |
4fbe63d1 PM |
683 | rc = netlbl_catmap_setlong(catmap, |
684 | spot, | |
685 | (unsigned long)-1, | |
686 | flags); | |
4b8feff2 PM |
687 | spot += BITS_PER_LONG; |
688 | } else | |
4fbe63d1 | 689 | rc = netlbl_catmap_setbit(catmap, spot++, flags); |
02752760 PM |
690 | } |
691 | ||
4b8feff2 PM |
692 | return rc; |
693 | } | |
694 | ||
695 | /** | |
4fbe63d1 | 696 | * netlbl_catmap_setlong - Import an unsigned long bitmap |
4b8feff2 PM |
697 | * @catmap: pointer to the category bitmap |
698 | * @offset: offset to the start of the imported bitmap | |
699 | * @bitmap: the bitmap to import | |
700 | * @flags: memory allocation flags | |
701 | * | |
702 | * Description: | |
703 | * Import the bitmap specified in @bitmap into @catmap, using the offset | |
704 | * in @offset. The offset must be aligned to an unsigned long. Returns zero | |
705 | * on success, negative values on failure. | |
706 | * | |
707 | */ | |
4fbe63d1 PM |
708 | int netlbl_catmap_setlong(struct netlbl_lsm_catmap **catmap, |
709 | u32 offset, | |
710 | unsigned long bitmap, | |
711 | gfp_t flags) | |
4b8feff2 | 712 | { |
4fbe63d1 | 713 | struct netlbl_lsm_catmap *iter; |
4b8feff2 PM |
714 | u32 idx; |
715 | ||
716 | /* only allow aligned offsets */ | |
717 | if ((offset & (BITS_PER_LONG - 1)) != 0) | |
718 | return -EINVAL; | |
719 | ||
4fbe63d1 | 720 | iter = _netlbl_catmap_getnode(catmap, offset, _CM_F_ALLOC, flags); |
4b8feff2 PM |
721 | if (iter == NULL) |
722 | return -ENOMEM; | |
723 | ||
724 | offset -= iter->startbit; | |
725 | idx = offset / NETLBL_CATMAP_MAPSIZE; | |
726 | iter->bitmap[idx] |= bitmap << (offset % NETLBL_CATMAP_MAPSIZE); | |
727 | ||
728 | return 0; | |
02752760 PM |
729 | } |
730 | ||
d15c345f PM |
731 | /* |
732 | * LSM Functions | |
733 | */ | |
734 | ||
23bcdc1a PM |
735 | /** |
736 | * netlbl_enabled - Determine if the NetLabel subsystem is enabled | |
737 | * | |
738 | * Description: | |
739 | * The LSM can use this function to determine if it should use NetLabel | |
740 | * security attributes in it's enforcement mechanism. Currently, NetLabel is | |
741 | * considered to be enabled when it's configuration contains a valid setup for | |
742 | * at least one labeled protocol (i.e. NetLabel can understand incoming | |
743 | * labeled packets of at least one type); otherwise NetLabel is considered to | |
744 | * be disabled. | |
745 | * | |
746 | */ | |
747 | int netlbl_enabled(void) | |
748 | { | |
749 | /* At some point we probably want to expose this mechanism to the user | |
750 | * as well so that admins can toggle NetLabel regardless of the | |
751 | * configuration */ | |
c783f1ce | 752 | return (atomic_read(&netlabel_mgmt_protocount) > 0); |
23bcdc1a PM |
753 | } |
754 | ||
d15c345f | 755 | /** |
389fb800 | 756 | * netlbl_sock_setattr - Label a socket using the correct protocol |
ba6ff9f2 | 757 | * @sk: the socket to label |
389fb800 | 758 | * @family: protocol family |
d15c345f PM |
759 | * @secattr: the security attributes |
760 | * | |
761 | * Description: | |
762 | * Attach the correct label to the given socket using the security attributes | |
ba6ff9f2 PM |
763 | * specified in @secattr. This function requires exclusive access to @sk, |
764 | * which means it either needs to be in the process of being created or locked. | |
63c41688 PM |
765 | * Returns zero on success, -EDESTADDRREQ if the domain is configured to use |
766 | * network address selectors (can't blindly label the socket), and negative | |
767 | * values on all other failures. | |
d15c345f PM |
768 | * |
769 | */ | |
ba6ff9f2 | 770 | int netlbl_sock_setattr(struct sock *sk, |
389fb800 | 771 | u16 family, |
ba6ff9f2 | 772 | const struct netlbl_lsm_secattr *secattr) |
d15c345f | 773 | { |
389fb800 | 774 | int ret_val; |
d15c345f PM |
775 | struct netlbl_dom_map *dom_entry; |
776 | ||
777 | rcu_read_lock(); | |
8f18e675 | 778 | dom_entry = netlbl_domhsh_getentry(secattr->domain, family); |
389fb800 PM |
779 | if (dom_entry == NULL) { |
780 | ret_val = -ENOENT; | |
d15c345f | 781 | goto socket_setattr_return; |
389fb800 PM |
782 | } |
783 | switch (family) { | |
784 | case AF_INET: | |
6a8b7f0c | 785 | switch (dom_entry->def.type) { |
389fb800 PM |
786 | case NETLBL_NLTYPE_ADDRSELECT: |
787 | ret_val = -EDESTADDRREQ; | |
788 | break; | |
789 | case NETLBL_NLTYPE_CIPSOV4: | |
790 | ret_val = cipso_v4_sock_setattr(sk, | |
6a8b7f0c PM |
791 | dom_entry->def.cipso, |
792 | secattr); | |
389fb800 PM |
793 | break; |
794 | case NETLBL_NLTYPE_UNLABELED: | |
795 | ret_val = 0; | |
796 | break; | |
797 | default: | |
798 | ret_val = -ENOENT; | |
799 | } | |
d15c345f | 800 | break; |
dfd56b8b | 801 | #if IS_ENABLED(CONFIG_IPV6) |
389fb800 PM |
802 | case AF_INET6: |
803 | /* since we don't support any IPv6 labeling protocols right | |
804 | * now we can optimize everything away until we do */ | |
d15c345f PM |
805 | ret_val = 0; |
806 | break; | |
389fb800 | 807 | #endif /* IPv6 */ |
d15c345f | 808 | default: |
389fb800 | 809 | ret_val = -EPROTONOSUPPORT; |
d15c345f PM |
810 | } |
811 | ||
812 | socket_setattr_return: | |
813 | rcu_read_unlock(); | |
814 | return ret_val; | |
815 | } | |
816 | ||
014ab19a PM |
817 | /** |
818 | * netlbl_sock_delattr - Delete all the NetLabel labels on a socket | |
819 | * @sk: the socket | |
820 | * | |
821 | * Description: | |
822 | * Remove all the NetLabel labeling from @sk. The caller is responsible for | |
823 | * ensuring that @sk is locked. | |
824 | * | |
825 | */ | |
826 | void netlbl_sock_delattr(struct sock *sk) | |
827 | { | |
0e0e3677 PM |
828 | switch (sk->sk_family) { |
829 | case AF_INET: | |
830 | cipso_v4_sock_delattr(sk); | |
831 | break; | |
832 | } | |
014ab19a PM |
833 | } |
834 | ||
14a72f53 PM |
835 | /** |
836 | * netlbl_sock_getattr - Determine the security attributes of a sock | |
837 | * @sk: the sock | |
838 | * @secattr: the security attributes | |
839 | * | |
840 | * Description: | |
8cc44579 | 841 | * Examines the given sock to see if any NetLabel style labeling has been |
14a72f53 PM |
842 | * applied to the sock, if so it parses the socket label and returns the |
843 | * security attributes in @secattr. Returns zero on success, negative values | |
844 | * on failure. | |
845 | * | |
846 | */ | |
389fb800 PM |
847 | int netlbl_sock_getattr(struct sock *sk, |
848 | struct netlbl_lsm_secattr *secattr) | |
14a72f53 | 849 | { |
389fb800 PM |
850 | int ret_val; |
851 | ||
852 | switch (sk->sk_family) { | |
853 | case AF_INET: | |
854 | ret_val = cipso_v4_sock_getattr(sk, secattr); | |
855 | break; | |
dfd56b8b | 856 | #if IS_ENABLED(CONFIG_IPV6) |
389fb800 PM |
857 | case AF_INET6: |
858 | ret_val = -ENOMSG; | |
859 | break; | |
860 | #endif /* IPv6 */ | |
861 | default: | |
862 | ret_val = -EPROTONOSUPPORT; | |
863 | } | |
864 | ||
865 | return ret_val; | |
14a72f53 PM |
866 | } |
867 | ||
014ab19a PM |
868 | /** |
869 | * netlbl_conn_setattr - Label a connected socket using the correct protocol | |
870 | * @sk: the socket to label | |
871 | * @addr: the destination address | |
872 | * @secattr: the security attributes | |
873 | * | |
874 | * Description: | |
875 | * Attach the correct label to the given connected socket using the security | |
876 | * attributes specified in @secattr. The caller is responsible for ensuring | |
877 | * that @sk is locked. Returns zero on success, negative values on failure. | |
878 | * | |
879 | */ | |
880 | int netlbl_conn_setattr(struct sock *sk, | |
881 | struct sockaddr *addr, | |
882 | const struct netlbl_lsm_secattr *secattr) | |
883 | { | |
884 | int ret_val; | |
885 | struct sockaddr_in *addr4; | |
6a8b7f0c | 886 | struct netlbl_dommap_def *entry; |
014ab19a PM |
887 | |
888 | rcu_read_lock(); | |
889 | switch (addr->sa_family) { | |
890 | case AF_INET: | |
891 | addr4 = (struct sockaddr_in *)addr; | |
6a8b7f0c PM |
892 | entry = netlbl_domhsh_getentry_af4(secattr->domain, |
893 | addr4->sin_addr.s_addr); | |
894 | if (entry == NULL) { | |
014ab19a PM |
895 | ret_val = -ENOENT; |
896 | goto conn_setattr_return; | |
897 | } | |
6a8b7f0c | 898 | switch (entry->type) { |
014ab19a PM |
899 | case NETLBL_NLTYPE_CIPSOV4: |
900 | ret_val = cipso_v4_sock_setattr(sk, | |
6a8b7f0c | 901 | entry->cipso, secattr); |
014ab19a PM |
902 | break; |
903 | case NETLBL_NLTYPE_UNLABELED: | |
904 | /* just delete the protocols we support for right now | |
905 | * but we could remove other protocols if needed */ | |
906 | cipso_v4_sock_delattr(sk); | |
907 | ret_val = 0; | |
908 | break; | |
909 | default: | |
910 | ret_val = -ENOENT; | |
911 | } | |
912 | break; | |
dfd56b8b | 913 | #if IS_ENABLED(CONFIG_IPV6) |
014ab19a PM |
914 | case AF_INET6: |
915 | /* since we don't support any IPv6 labeling protocols right | |
916 | * now we can optimize everything away until we do */ | |
917 | ret_val = 0; | |
918 | break; | |
919 | #endif /* IPv6 */ | |
920 | default: | |
389fb800 | 921 | ret_val = -EPROTONOSUPPORT; |
014ab19a PM |
922 | } |
923 | ||
924 | conn_setattr_return: | |
925 | rcu_read_unlock(); | |
926 | return ret_val; | |
927 | } | |
928 | ||
389fb800 PM |
929 | /** |
930 | * netlbl_req_setattr - Label a request socket using the correct protocol | |
931 | * @req: the request socket to label | |
932 | * @secattr: the security attributes | |
933 | * | |
934 | * Description: | |
935 | * Attach the correct label to the given socket using the security attributes | |
936 | * specified in @secattr. Returns zero on success, negative values on failure. | |
937 | * | |
938 | */ | |
939 | int netlbl_req_setattr(struct request_sock *req, | |
940 | const struct netlbl_lsm_secattr *secattr) | |
941 | { | |
942 | int ret_val; | |
6a8b7f0c | 943 | struct netlbl_dommap_def *entry; |
389fb800 PM |
944 | |
945 | rcu_read_lock(); | |
389fb800 PM |
946 | switch (req->rsk_ops->family) { |
947 | case AF_INET: | |
6a8b7f0c | 948 | entry = netlbl_domhsh_getentry_af4(secattr->domain, |
634fb979 | 949 | inet_rsk(req)->ir_rmt_addr); |
6a8b7f0c PM |
950 | if (entry == NULL) { |
951 | ret_val = -ENOENT; | |
952 | goto req_setattr_return; | |
389fb800 | 953 | } |
6a8b7f0c | 954 | switch (entry->type) { |
389fb800 | 955 | case NETLBL_NLTYPE_CIPSOV4: |
6a8b7f0c PM |
956 | ret_val = cipso_v4_req_setattr(req, |
957 | entry->cipso, secattr); | |
389fb800 PM |
958 | break; |
959 | case NETLBL_NLTYPE_UNLABELED: | |
960 | /* just delete the protocols we support for right now | |
961 | * but we could remove other protocols if needed */ | |
962 | cipso_v4_req_delattr(req); | |
963 | ret_val = 0; | |
964 | break; | |
965 | default: | |
966 | ret_val = -ENOENT; | |
967 | } | |
968 | break; | |
dfd56b8b | 969 | #if IS_ENABLED(CONFIG_IPV6) |
389fb800 PM |
970 | case AF_INET6: |
971 | /* since we don't support any IPv6 labeling protocols right | |
972 | * now we can optimize everything away until we do */ | |
973 | ret_val = 0; | |
974 | break; | |
975 | #endif /* IPv6 */ | |
976 | default: | |
977 | ret_val = -EPROTONOSUPPORT; | |
978 | } | |
979 | ||
980 | req_setattr_return: | |
981 | rcu_read_unlock(); | |
982 | return ret_val; | |
983 | } | |
984 | ||
07feee8f PM |
985 | /** |
986 | * netlbl_req_delattr - Delete all the NetLabel labels on a socket | |
987 | * @req: the socket | |
988 | * | |
989 | * Description: | |
990 | * Remove all the NetLabel labeling from @req. | |
991 | * | |
992 | */ | |
993 | void netlbl_req_delattr(struct request_sock *req) | |
994 | { | |
0e0e3677 PM |
995 | switch (req->rsk_ops->family) { |
996 | case AF_INET: | |
997 | cipso_v4_req_delattr(req); | |
998 | break; | |
999 | } | |
07feee8f PM |
1000 | } |
1001 | ||
948bf85c PM |
1002 | /** |
1003 | * netlbl_skbuff_setattr - Label a packet using the correct protocol | |
1004 | * @skb: the packet | |
1005 | * @family: protocol family | |
1006 | * @secattr: the security attributes | |
1007 | * | |
1008 | * Description: | |
1009 | * Attach the correct label to the given packet using the security attributes | |
1010 | * specified in @secattr. Returns zero on success, negative values on failure. | |
1011 | * | |
1012 | */ | |
1013 | int netlbl_skbuff_setattr(struct sk_buff *skb, | |
1014 | u16 family, | |
1015 | const struct netlbl_lsm_secattr *secattr) | |
1016 | { | |
1017 | int ret_val; | |
1018 | struct iphdr *hdr4; | |
6a8b7f0c | 1019 | struct netlbl_dommap_def *entry; |
948bf85c PM |
1020 | |
1021 | rcu_read_lock(); | |
1022 | switch (family) { | |
1023 | case AF_INET: | |
1024 | hdr4 = ip_hdr(skb); | |
6a8b7f0c PM |
1025 | entry = netlbl_domhsh_getentry_af4(secattr->domain,hdr4->daddr); |
1026 | if (entry == NULL) { | |
948bf85c PM |
1027 | ret_val = -ENOENT; |
1028 | goto skbuff_setattr_return; | |
1029 | } | |
6a8b7f0c | 1030 | switch (entry->type) { |
948bf85c | 1031 | case NETLBL_NLTYPE_CIPSOV4: |
6a8b7f0c PM |
1032 | ret_val = cipso_v4_skbuff_setattr(skb, entry->cipso, |
1033 | secattr); | |
948bf85c PM |
1034 | break; |
1035 | case NETLBL_NLTYPE_UNLABELED: | |
1036 | /* just delete the protocols we support for right now | |
1037 | * but we could remove other protocols if needed */ | |
1038 | ret_val = cipso_v4_skbuff_delattr(skb); | |
1039 | break; | |
1040 | default: | |
1041 | ret_val = -ENOENT; | |
1042 | } | |
1043 | break; | |
dfd56b8b | 1044 | #if IS_ENABLED(CONFIG_IPV6) |
948bf85c PM |
1045 | case AF_INET6: |
1046 | /* since we don't support any IPv6 labeling protocols right | |
1047 | * now we can optimize everything away until we do */ | |
1048 | ret_val = 0; | |
1049 | break; | |
1050 | #endif /* IPv6 */ | |
1051 | default: | |
389fb800 | 1052 | ret_val = -EPROTONOSUPPORT; |
948bf85c PM |
1053 | } |
1054 | ||
1055 | skbuff_setattr_return: | |
1056 | rcu_read_unlock(); | |
1057 | return ret_val; | |
1058 | } | |
1059 | ||
d15c345f PM |
1060 | /** |
1061 | * netlbl_skbuff_getattr - Determine the security attributes of a packet | |
1062 | * @skb: the packet | |
75e22910 | 1063 | * @family: protocol family |
d15c345f PM |
1064 | * @secattr: the security attributes |
1065 | * | |
1066 | * Description: | |
1067 | * Examines the given packet to see if a recognized form of packet labeling | |
1068 | * is present, if so it parses the packet label and returns the security | |
1069 | * attributes in @secattr. Returns zero on success, negative values on | |
1070 | * failure. | |
1071 | * | |
1072 | */ | |
1073 | int netlbl_skbuff_getattr(const struct sk_buff *skb, | |
75e22910 | 1074 | u16 family, |
d15c345f PM |
1075 | struct netlbl_lsm_secattr *secattr) |
1076 | { | |
04f81f01 PM |
1077 | unsigned char *ptr; |
1078 | ||
389fb800 PM |
1079 | switch (family) { |
1080 | case AF_INET: | |
04f81f01 PM |
1081 | ptr = cipso_v4_optptr(skb); |
1082 | if (ptr && cipso_v4_getattr(ptr, secattr) == 0) | |
389fb800 PM |
1083 | return 0; |
1084 | break; | |
dfd56b8b | 1085 | #if IS_ENABLED(CONFIG_IPV6) |
389fb800 PM |
1086 | case AF_INET6: |
1087 | break; | |
1088 | #endif /* IPv6 */ | |
1089 | } | |
d15c345f | 1090 | |
8cc44579 | 1091 | return netlbl_unlabel_getattr(skb, family, secattr); |
d15c345f PM |
1092 | } |
1093 | ||
1094 | /** | |
1095 | * netlbl_skbuff_err - Handle a LSM error on a sk_buff | |
1096 | * @skb: the packet | |
1097 | * @error: the error code | |
dfaebe98 | 1098 | * @gateway: true if host is acting as a gateway, false otherwise |
d15c345f PM |
1099 | * |
1100 | * Description: | |
1101 | * Deal with a LSM problem when handling the packet in @skb, typically this is | |
1102 | * a permission denied problem (-EACCES). The correct action is determined | |
1103 | * according to the packet's labeling protocol. | |
1104 | * | |
1105 | */ | |
dfaebe98 | 1106 | void netlbl_skbuff_err(struct sk_buff *skb, int error, int gateway) |
d15c345f | 1107 | { |
04f81f01 | 1108 | if (cipso_v4_optptr(skb)) |
dfaebe98 | 1109 | cipso_v4_error(skb, error, gateway); |
d15c345f PM |
1110 | } |
1111 | ||
1112 | /** | |
1113 | * netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches | |
1114 | * | |
1115 | * Description: | |
1116 | * For all of the NetLabel protocols that support some form of label mapping | |
1117 | * cache, invalidate the cache. Returns zero on success, negative values on | |
1118 | * error. | |
1119 | * | |
1120 | */ | |
1121 | void netlbl_cache_invalidate(void) | |
1122 | { | |
1123 | cipso_v4_cache_invalidate(); | |
1124 | } | |
1125 | ||
1126 | /** | |
1127 | * netlbl_cache_add - Add an entry to a NetLabel protocol cache | |
1128 | * @skb: the packet | |
1129 | * @secattr: the packet's security attributes | |
1130 | * | |
1131 | * Description: | |
1132 | * Add the LSM security attributes for the given packet to the underlying | |
1133 | * NetLabel protocol's label mapping cache. Returns zero on success, negative | |
1134 | * values on error. | |
1135 | * | |
1136 | */ | |
1137 | int netlbl_cache_add(const struct sk_buff *skb, | |
1138 | const struct netlbl_lsm_secattr *secattr) | |
1139 | { | |
04f81f01 PM |
1140 | unsigned char *ptr; |
1141 | ||
701a90ba | 1142 | if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0) |
d15c345f PM |
1143 | return -ENOMSG; |
1144 | ||
04f81f01 PM |
1145 | ptr = cipso_v4_optptr(skb); |
1146 | if (ptr) | |
1147 | return cipso_v4_cache_add(ptr, secattr); | |
d15c345f PM |
1148 | |
1149 | return -ENOMSG; | |
1150 | } | |
1151 | ||
6c2e8ac0 PM |
1152 | /* |
1153 | * Protocol Engine Functions | |
1154 | */ | |
1155 | ||
1156 | /** | |
1157 | * netlbl_audit_start - Start an audit message | |
1158 | * @type: audit message type | |
1159 | * @audit_info: NetLabel audit information | |
1160 | * | |
1161 | * Description: | |
1162 | * Start an audit message using the type specified in @type and fill the audit | |
1163 | * message with some fields common to all NetLabel audit messages. This | |
1164 | * function should only be used by protocol engines, not LSMs. Returns a | |
1165 | * pointer to the audit buffer on success, NULL on failure. | |
1166 | * | |
1167 | */ | |
1168 | struct audit_buffer *netlbl_audit_start(int type, | |
1169 | struct netlbl_audit *audit_info) | |
1170 | { | |
1171 | return netlbl_audit_start_common(type, audit_info); | |
1172 | } | |
cb72d382 | 1173 | EXPORT_SYMBOL(netlbl_audit_start); |
6c2e8ac0 | 1174 | |
d15c345f PM |
1175 | /* |
1176 | * Setup Functions | |
1177 | */ | |
1178 | ||
1179 | /** | |
1180 | * netlbl_init - Initialize NetLabel | |
1181 | * | |
1182 | * Description: | |
1183 | * Perform the required NetLabel initialization before first use. | |
1184 | * | |
1185 | */ | |
1186 | static int __init netlbl_init(void) | |
1187 | { | |
1188 | int ret_val; | |
1189 | ||
1190 | printk(KERN_INFO "NetLabel: Initializing\n"); | |
1191 | printk(KERN_INFO "NetLabel: domain hash size = %u\n", | |
1192 | (1 << NETLBL_DOMHSH_BITSIZE)); | |
1193 | printk(KERN_INFO "NetLabel: protocols =" | |
1194 | " UNLABELED" | |
1195 | " CIPSOv4" | |
1196 | "\n"); | |
1197 | ||
1198 | ret_val = netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE); | |
1199 | if (ret_val != 0) | |
1200 | goto init_failure; | |
1201 | ||
8cc44579 PM |
1202 | ret_val = netlbl_unlabel_init(NETLBL_UNLHSH_BITSIZE); |
1203 | if (ret_val != 0) | |
1204 | goto init_failure; | |
1205 | ||
d15c345f PM |
1206 | ret_val = netlbl_netlink_init(); |
1207 | if (ret_val != 0) | |
1208 | goto init_failure; | |
1209 | ||
1210 | ret_val = netlbl_unlabel_defconf(); | |
1211 | if (ret_val != 0) | |
1212 | goto init_failure; | |
1213 | printk(KERN_INFO "NetLabel: unlabeled traffic allowed by default\n"); | |
1214 | ||
1215 | return 0; | |
1216 | ||
1217 | init_failure: | |
1218 | panic("NetLabel: failed to initialize properly (%d)\n", ret_val); | |
1219 | } | |
1220 | ||
1221 | subsys_initcall(netlbl_init); |