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