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> | |
ceba1832 | 40 | #include <net/calipso.h> |
d15c345f | 41 | #include <asm/bug.h> |
60063497 | 42 | #include <linux/atomic.h> |
d15c345f PM |
43 | |
44 | #include "netlabel_domainhash.h" | |
45 | #include "netlabel_unlabeled.h" | |
eda61d32 | 46 | #include "netlabel_cipso_v4.h" |
ceba1832 | 47 | #include "netlabel_calipso.h" |
d15c345f | 48 | #include "netlabel_user.h" |
23bcdc1a | 49 | #include "netlabel_mgmt.h" |
6c2e8ac0 | 50 | #include "netlabel_addrlist.h" |
d15c345f | 51 | |
eda61d32 PM |
52 | /* |
53 | * Configuration Functions | |
54 | */ | |
55 | ||
56 | /** | |
57 | * netlbl_cfg_map_del - Remove a NetLabel/LSM domain mapping | |
58 | * @domain: the domain mapping to remove | |
6c2e8ac0 PM |
59 | * @family: address family |
60 | * @addr: IP address | |
61 | * @mask: IP address mask | |
eda61d32 PM |
62 | * @audit_info: NetLabel audit information |
63 | * | |
64 | * Description: | |
65 | * Removes a NetLabel/LSM domain mapping. A @domain value of NULL causes the | |
66 | * default domain mapping to be removed. Returns zero on success, negative | |
67 | * values on failure. | |
68 | * | |
69 | */ | |
6c2e8ac0 PM |
70 | int netlbl_cfg_map_del(const char *domain, |
71 | u16 family, | |
72 | const void *addr, | |
73 | const void *mask, | |
74 | struct netlbl_audit *audit_info) | |
eda61d32 | 75 | { |
6c2e8ac0 | 76 | if (addr == NULL && mask == NULL) { |
8f18e675 | 77 | return netlbl_domhsh_remove(domain, family, audit_info); |
6c2e8ac0 PM |
78 | } else if (addr != NULL && mask != NULL) { |
79 | switch (family) { | |
80 | case AF_INET: | |
81 | return netlbl_domhsh_remove_af4(domain, addr, mask, | |
82 | audit_info); | |
83 | default: | |
84 | return -EPFNOSUPPORT; | |
85 | } | |
86 | } else | |
87 | return -EINVAL; | |
eda61d32 PM |
88 | } |
89 | ||
90 | /** | |
6c2e8ac0 | 91 | * netlbl_cfg_unlbl_map_add - Add a new unlabeled mapping |
eda61d32 | 92 | * @domain: the domain mapping to add |
6c2e8ac0 PM |
93 | * @family: address family |
94 | * @addr: IP address | |
95 | * @mask: IP address mask | |
eda61d32 PM |
96 | * @audit_info: NetLabel audit information |
97 | * | |
98 | * Description: | |
99 | * Adds a new unlabeled NetLabel/LSM domain mapping. A @domain value of NULL | |
100 | * causes a new default domain mapping to be added. Returns zero on success, | |
101 | * negative values on failure. | |
102 | * | |
103 | */ | |
6c2e8ac0 PM |
104 | int netlbl_cfg_unlbl_map_add(const char *domain, |
105 | u16 family, | |
106 | const void *addr, | |
107 | const void *mask, | |
eda61d32 PM |
108 | struct netlbl_audit *audit_info) |
109 | { | |
110 | int ret_val = -ENOMEM; | |
111 | struct netlbl_dom_map *entry; | |
6c2e8ac0 PM |
112 | struct netlbl_domaddr_map *addrmap = NULL; |
113 | struct netlbl_domaddr4_map *map4 = NULL; | |
114 | struct netlbl_domaddr6_map *map6 = NULL; | |
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 | } | |
8f18e675 | 124 | entry->family = family; |
6c2e8ac0 PM |
125 | |
126 | if (addr == NULL && mask == NULL) | |
6a8b7f0c | 127 | entry->def.type = NETLBL_NLTYPE_UNLABELED; |
6c2e8ac0 PM |
128 | else if (addr != NULL && mask != NULL) { |
129 | addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC); | |
130 | if (addrmap == NULL) | |
131 | goto cfg_unlbl_map_add_failure; | |
132 | INIT_LIST_HEAD(&addrmap->list4); | |
133 | INIT_LIST_HEAD(&addrmap->list6); | |
134 | ||
135 | switch (family) { | |
1281bc25 PM |
136 | case AF_INET: { |
137 | const struct in_addr *addr4 = addr; | |
138 | const struct in_addr *mask4 = mask; | |
6c2e8ac0 PM |
139 | map4 = kzalloc(sizeof(*map4), GFP_ATOMIC); |
140 | if (map4 == NULL) | |
141 | goto cfg_unlbl_map_add_failure; | |
6a8b7f0c | 142 | map4->def.type = NETLBL_NLTYPE_UNLABELED; |
6c2e8ac0 PM |
143 | map4->list.addr = addr4->s_addr & mask4->s_addr; |
144 | map4->list.mask = mask4->s_addr; | |
145 | map4->list.valid = 1; | |
146 | ret_val = netlbl_af4list_add(&map4->list, | |
147 | &addrmap->list4); | |
148 | if (ret_val != 0) | |
149 | goto cfg_unlbl_map_add_failure; | |
150 | break; | |
1281bc25 | 151 | } |
dfd56b8b | 152 | #if IS_ENABLED(CONFIG_IPV6) |
1281bc25 PM |
153 | case AF_INET6: { |
154 | const struct in6_addr *addr6 = addr; | |
155 | const struct in6_addr *mask6 = mask; | |
6c2e8ac0 | 156 | map6 = kzalloc(sizeof(*map6), GFP_ATOMIC); |
ca7daea6 | 157 | if (map6 == NULL) |
6c2e8ac0 | 158 | goto cfg_unlbl_map_add_failure; |
6a8b7f0c | 159 | map6->def.type = NETLBL_NLTYPE_UNLABELED; |
4e3fd7a0 | 160 | map6->list.addr = *addr6; |
6c2e8ac0 PM |
161 | map6->list.addr.s6_addr32[0] &= mask6->s6_addr32[0]; |
162 | map6->list.addr.s6_addr32[1] &= mask6->s6_addr32[1]; | |
163 | map6->list.addr.s6_addr32[2] &= mask6->s6_addr32[2]; | |
164 | map6->list.addr.s6_addr32[3] &= mask6->s6_addr32[3]; | |
4e3fd7a0 | 165 | map6->list.mask = *mask6; |
6c2e8ac0 | 166 | map6->list.valid = 1; |
42ca0203 DC |
167 | ret_val = netlbl_af6list_add(&map6->list, |
168 | &addrmap->list6); | |
6c2e8ac0 PM |
169 | if (ret_val != 0) |
170 | goto cfg_unlbl_map_add_failure; | |
171 | break; | |
1281bc25 PM |
172 | } |
173 | #endif /* IPv6 */ | |
6c2e8ac0 PM |
174 | default: |
175 | goto cfg_unlbl_map_add_failure; | |
6c2e8ac0 PM |
176 | } |
177 | ||
6a8b7f0c PM |
178 | entry->def.addrsel = addrmap; |
179 | entry->def.type = NETLBL_NLTYPE_ADDRSELECT; | |
6c2e8ac0 PM |
180 | } else { |
181 | ret_val = -EINVAL; | |
182 | goto cfg_unlbl_map_add_failure; | |
eda61d32 | 183 | } |
eda61d32 PM |
184 | |
185 | ret_val = netlbl_domhsh_add(entry, audit_info); | |
186 | if (ret_val != 0) | |
6c2e8ac0 | 187 | goto cfg_unlbl_map_add_failure; |
eda61d32 PM |
188 | |
189 | return 0; | |
190 | ||
6c2e8ac0 | 191 | cfg_unlbl_map_add_failure: |
47943234 | 192 | kfree(entry->domain); |
eda61d32 | 193 | kfree(entry); |
6c2e8ac0 PM |
194 | kfree(addrmap); |
195 | kfree(map4); | |
196 | kfree(map6); | |
eda61d32 PM |
197 | return ret_val; |
198 | } | |
199 | ||
6c2e8ac0 PM |
200 | |
201 | /** | |
202 | * netlbl_cfg_unlbl_static_add - Adds a new static label | |
203 | * @net: network namespace | |
204 | * @dev_name: interface name | |
205 | * @addr: IP address in network byte order (struct in[6]_addr) | |
206 | * @mask: address mask in network byte order (struct in[6]_addr) | |
207 | * @family: address family | |
208 | * @secid: LSM secid value for the entry | |
209 | * @audit_info: NetLabel audit information | |
210 | * | |
211 | * Description: | |
212 | * Adds a new NetLabel static label to be used when protocol provided labels | |
213 | * are not present on incoming traffic. If @dev_name is NULL then the default | |
214 | * interface will be used. Returns zero on success, negative values on failure. | |
215 | * | |
216 | */ | |
217 | int netlbl_cfg_unlbl_static_add(struct net *net, | |
218 | const char *dev_name, | |
219 | const void *addr, | |
220 | const void *mask, | |
221 | u16 family, | |
222 | u32 secid, | |
223 | struct netlbl_audit *audit_info) | |
224 | { | |
225 | u32 addr_len; | |
226 | ||
227 | switch (family) { | |
228 | case AF_INET: | |
229 | addr_len = sizeof(struct in_addr); | |
230 | break; | |
dfd56b8b | 231 | #if IS_ENABLED(CONFIG_IPV6) |
6c2e8ac0 PM |
232 | case AF_INET6: |
233 | addr_len = sizeof(struct in6_addr); | |
234 | break; | |
1281bc25 | 235 | #endif /* IPv6 */ |
6c2e8ac0 PM |
236 | default: |
237 | return -EPFNOSUPPORT; | |
238 | } | |
239 | ||
240 | return netlbl_unlhsh_add(net, | |
241 | dev_name, addr, mask, addr_len, | |
242 | secid, audit_info); | |
243 | } | |
244 | ||
245 | /** | |
246 | * netlbl_cfg_unlbl_static_del - Removes an existing static label | |
247 | * @net: network namespace | |
248 | * @dev_name: interface name | |
249 | * @addr: IP address in network byte order (struct in[6]_addr) | |
250 | * @mask: address mask in network byte order (struct in[6]_addr) | |
251 | * @family: address family | |
6c2e8ac0 PM |
252 | * @audit_info: NetLabel audit information |
253 | * | |
254 | * Description: | |
255 | * Removes an existing NetLabel static label used when protocol provided labels | |
256 | * are not present on incoming traffic. If @dev_name is NULL then the default | |
257 | * interface will be used. Returns zero on success, negative values on failure. | |
258 | * | |
259 | */ | |
260 | int netlbl_cfg_unlbl_static_del(struct net *net, | |
261 | const char *dev_name, | |
262 | const void *addr, | |
263 | const void *mask, | |
264 | u16 family, | |
265 | struct netlbl_audit *audit_info) | |
266 | { | |
267 | u32 addr_len; | |
268 | ||
269 | switch (family) { | |
270 | case AF_INET: | |
271 | addr_len = sizeof(struct in_addr); | |
272 | break; | |
dfd56b8b | 273 | #if IS_ENABLED(CONFIG_IPV6) |
6c2e8ac0 PM |
274 | case AF_INET6: |
275 | addr_len = sizeof(struct in6_addr); | |
276 | break; | |
1281bc25 | 277 | #endif /* IPv6 */ |
6c2e8ac0 PM |
278 | default: |
279 | return -EPFNOSUPPORT; | |
280 | } | |
281 | ||
282 | return netlbl_unlhsh_remove(net, | |
283 | dev_name, addr, mask, addr_len, | |
284 | audit_info); | |
285 | } | |
286 | ||
287 | /** | |
288 | * netlbl_cfg_cipsov4_add - Add a new CIPSOv4 DOI definition | |
289 | * @doi_def: CIPSO DOI definition | |
290 | * @audit_info: NetLabel audit information | |
291 | * | |
292 | * Description: | |
293 | * Add a new CIPSO DOI definition as defined by @doi_def. Returns zero on | |
294 | * success and negative values on failure. | |
295 | * | |
296 | */ | |
297 | int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def, | |
298 | struct netlbl_audit *audit_info) | |
299 | { | |
300 | return cipso_v4_doi_add(doi_def, audit_info); | |
301 | } | |
302 | ||
303 | /** | |
304 | * netlbl_cfg_cipsov4_del - Remove an existing CIPSOv4 DOI definition | |
305 | * @doi: CIPSO DOI | |
306 | * @audit_info: NetLabel audit information | |
307 | * | |
308 | * Description: | |
309 | * Remove an existing CIPSO DOI definition matching @doi. Returns zero on | |
310 | * success and negative values on failure. | |
311 | * | |
312 | */ | |
313 | void netlbl_cfg_cipsov4_del(u32 doi, struct netlbl_audit *audit_info) | |
314 | { | |
315 | cipso_v4_doi_remove(doi, audit_info); | |
316 | } | |
317 | ||
eda61d32 | 318 | /** |
6c2e8ac0 PM |
319 | * netlbl_cfg_cipsov4_map_add - Add a new CIPSOv4 DOI mapping |
320 | * @doi: the CIPSO DOI | |
eda61d32 | 321 | * @domain: the domain mapping to add |
6c2e8ac0 PM |
322 | * @addr: IP address |
323 | * @mask: IP address mask | |
eda61d32 PM |
324 | * @audit_info: NetLabel audit information |
325 | * | |
326 | * Description: | |
6c2e8ac0 PM |
327 | * Add a new NetLabel/LSM domain mapping for the given CIPSO DOI to the NetLabel |
328 | * subsystem. A @domain value of NULL adds a new default domain mapping. | |
329 | * Returns zero on success, negative values on failure. | |
eda61d32 PM |
330 | * |
331 | */ | |
6c2e8ac0 | 332 | int netlbl_cfg_cipsov4_map_add(u32 doi, |
eda61d32 | 333 | const char *domain, |
6c2e8ac0 PM |
334 | const struct in_addr *addr, |
335 | const struct in_addr *mask, | |
eda61d32 PM |
336 | struct netlbl_audit *audit_info) |
337 | { | |
338 | int ret_val = -ENOMEM; | |
6c2e8ac0 | 339 | struct cipso_v4_doi *doi_def; |
eda61d32 | 340 | struct netlbl_dom_map *entry; |
6c2e8ac0 PM |
341 | struct netlbl_domaddr_map *addrmap = NULL; |
342 | struct netlbl_domaddr4_map *addrinfo = NULL; | |
eda61d32 | 343 | |
6c2e8ac0 PM |
344 | doi_def = cipso_v4_doi_getdef(doi); |
345 | if (doi_def == NULL) | |
346 | return -ENOENT; | |
b1edeb10 | 347 | |
eda61d32 PM |
348 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); |
349 | if (entry == NULL) | |
94a80d63 | 350 | goto out_entry; |
8f18e675 | 351 | entry->family = AF_INET; |
eda61d32 PM |
352 | if (domain != NULL) { |
353 | entry->domain = kstrdup(domain, GFP_ATOMIC); | |
354 | if (entry->domain == NULL) | |
94a80d63 | 355 | goto out_domain; |
eda61d32 | 356 | } |
eda61d32 | 357 | |
6c2e8ac0 | 358 | if (addr == NULL && mask == NULL) { |
6a8b7f0c PM |
359 | entry->def.cipso = doi_def; |
360 | entry->def.type = NETLBL_NLTYPE_CIPSOV4; | |
6c2e8ac0 PM |
361 | } else if (addr != NULL && mask != NULL) { |
362 | addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC); | |
363 | if (addrmap == NULL) | |
94a80d63 | 364 | goto out_addrmap; |
6c2e8ac0 PM |
365 | INIT_LIST_HEAD(&addrmap->list4); |
366 | INIT_LIST_HEAD(&addrmap->list6); | |
367 | ||
368 | addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC); | |
369 | if (addrinfo == NULL) | |
94a80d63 | 370 | goto out_addrinfo; |
6a8b7f0c PM |
371 | addrinfo->def.cipso = doi_def; |
372 | addrinfo->def.type = NETLBL_NLTYPE_CIPSOV4; | |
6c2e8ac0 PM |
373 | addrinfo->list.addr = addr->s_addr & mask->s_addr; |
374 | addrinfo->list.mask = mask->s_addr; | |
375 | addrinfo->list.valid = 1; | |
376 | ret_val = netlbl_af4list_add(&addrinfo->list, &addrmap->list4); | |
377 | if (ret_val != 0) | |
378 | goto cfg_cipsov4_map_add_failure; | |
379 | ||
6a8b7f0c PM |
380 | entry->def.addrsel = addrmap; |
381 | entry->def.type = NETLBL_NLTYPE_ADDRSELECT; | |
6c2e8ac0 PM |
382 | } else { |
383 | ret_val = -EINVAL; | |
94a80d63 | 384 | goto out_addrmap; |
b1edeb10 | 385 | } |
6c2e8ac0 | 386 | |
eda61d32 PM |
387 | ret_val = netlbl_domhsh_add(entry, audit_info); |
388 | if (ret_val != 0) | |
6c2e8ac0 | 389 | goto cfg_cipsov4_map_add_failure; |
b1edeb10 | 390 | |
6c2e8ac0 | 391 | return 0; |
b1edeb10 | 392 | |
6c2e8ac0 | 393 | cfg_cipsov4_map_add_failure: |
94a80d63 JL |
394 | kfree(addrinfo); |
395 | out_addrinfo: | |
396 | kfree(addrmap); | |
397 | out_addrmap: | |
47943234 | 398 | kfree(entry->domain); |
94a80d63 | 399 | out_domain: |
eda61d32 | 400 | kfree(entry); |
94a80d63 JL |
401 | out_entry: |
402 | cipso_v4_doi_putdef(doi_def); | |
6c2e8ac0 | 403 | return ret_val; |
eda61d32 PM |
404 | } |
405 | ||
02752760 PM |
406 | /* |
407 | * Security Attribute Functions | |
408 | */ | |
409 | ||
4b8feff2 PM |
410 | #define _CM_F_NONE 0x00000000 |
411 | #define _CM_F_ALLOC 0x00000001 | |
d960a618 | 412 | #define _CM_F_WALK 0x00000002 |
4b8feff2 PM |
413 | |
414 | /** | |
4fbe63d1 | 415 | * _netlbl_catmap_getnode - Get a individual node from a catmap |
4b8feff2 PM |
416 | * @catmap: pointer to the category bitmap |
417 | * @offset: the requested offset | |
418 | * @cm_flags: catmap flags, see _CM_F_* | |
419 | * @gfp_flags: memory allocation flags | |
420 | * | |
421 | * Description: | |
d960a618 PM |
422 | * Iterate through the catmap looking for the node associated with @offset. |
423 | * If the _CM_F_ALLOC flag is set in @cm_flags and there is no associated node, | |
424 | * one will be created and inserted into the catmap. If the _CM_F_WALK flag is | |
425 | * set in @cm_flags and there is no associated node, the next highest node will | |
426 | * be returned. Returns a pointer to the node on success, NULL on failure. | |
4b8feff2 PM |
427 | * |
428 | */ | |
4fbe63d1 PM |
429 | static struct netlbl_lsm_catmap *_netlbl_catmap_getnode( |
430 | struct netlbl_lsm_catmap **catmap, | |
431 | u32 offset, | |
432 | unsigned int cm_flags, | |
433 | gfp_t gfp_flags) | |
4b8feff2 | 434 | { |
4fbe63d1 PM |
435 | struct netlbl_lsm_catmap *iter = *catmap; |
436 | struct netlbl_lsm_catmap *prev = NULL; | |
4b8feff2 | 437 | |
d960a618 | 438 | if (iter == NULL) |
4fbe63d1 | 439 | goto catmap_getnode_alloc; |
d960a618 | 440 | if (offset < iter->startbit) |
4fbe63d1 | 441 | goto catmap_getnode_walk; |
4b8feff2 PM |
442 | while (iter && offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) { |
443 | prev = iter; | |
444 | iter = iter->next; | |
445 | } | |
446 | if (iter == NULL || offset < iter->startbit) | |
4fbe63d1 | 447 | goto catmap_getnode_walk; |
4b8feff2 PM |
448 | |
449 | return iter; | |
450 | ||
4fbe63d1 | 451 | catmap_getnode_walk: |
d960a618 PM |
452 | if (cm_flags & _CM_F_WALK) |
453 | return iter; | |
4fbe63d1 | 454 | catmap_getnode_alloc: |
4b8feff2 PM |
455 | if (!(cm_flags & _CM_F_ALLOC)) |
456 | return NULL; | |
457 | ||
4fbe63d1 | 458 | iter = netlbl_catmap_alloc(gfp_flags); |
4b8feff2 PM |
459 | if (iter == NULL) |
460 | return NULL; | |
461 | iter->startbit = offset & ~(NETLBL_CATMAP_SIZE - 1); | |
462 | ||
463 | if (prev == NULL) { | |
464 | iter->next = *catmap; | |
465 | *catmap = iter; | |
466 | } else { | |
467 | iter->next = prev->next; | |
468 | prev->next = iter; | |
469 | } | |
470 | ||
471 | return iter; | |
472 | } | |
473 | ||
02752760 | 474 | /** |
4fbe63d1 | 475 | * netlbl_catmap_walk - Walk a LSM secattr catmap looking for a bit |
02752760 PM |
476 | * @catmap: the category bitmap |
477 | * @offset: the offset to start searching at, in bits | |
478 | * | |
479 | * Description: | |
480 | * This function walks a LSM secattr category bitmap starting at @offset and | |
481 | * returns the spot of the first set bit or -ENOENT if no bits are set. | |
482 | * | |
483 | */ | |
4fbe63d1 | 484 | int netlbl_catmap_walk(struct netlbl_lsm_catmap *catmap, u32 offset) |
02752760 | 485 | { |
4fbe63d1 | 486 | struct netlbl_lsm_catmap *iter = catmap; |
d960a618 PM |
487 | u32 idx; |
488 | u32 bit; | |
02752760 PM |
489 | NETLBL_CATMAP_MAPTYPE bitmap; |
490 | ||
4fbe63d1 | 491 | iter = _netlbl_catmap_getnode(&catmap, offset, _CM_F_WALK, 0); |
d960a618 PM |
492 | if (iter == NULL) |
493 | return -ENOENT; | |
02752760 | 494 | if (offset > iter->startbit) { |
d960a618 PM |
495 | offset -= iter->startbit; |
496 | idx = offset / NETLBL_CATMAP_MAPSIZE; | |
497 | bit = offset % NETLBL_CATMAP_MAPSIZE; | |
02752760 | 498 | } else { |
d960a618 PM |
499 | idx = 0; |
500 | bit = 0; | |
02752760 | 501 | } |
d960a618 | 502 | bitmap = iter->bitmap[idx] >> bit; |
02752760 PM |
503 | |
504 | for (;;) { | |
505 | if (bitmap != 0) { | |
506 | while ((bitmap & NETLBL_CATMAP_BIT) == 0) { | |
507 | bitmap >>= 1; | |
d960a618 | 508 | bit++; |
02752760 PM |
509 | } |
510 | return iter->startbit + | |
d960a618 | 511 | (NETLBL_CATMAP_MAPSIZE * idx) + bit; |
02752760 | 512 | } |
d960a618 | 513 | if (++idx >= NETLBL_CATMAP_MAPCNT) { |
02752760 PM |
514 | if (iter->next != NULL) { |
515 | iter = iter->next; | |
d960a618 | 516 | idx = 0; |
02752760 PM |
517 | } else |
518 | return -ENOENT; | |
519 | } | |
d960a618 PM |
520 | bitmap = iter->bitmap[idx]; |
521 | bit = 0; | |
02752760 PM |
522 | } |
523 | ||
524 | return -ENOENT; | |
525 | } | |
ceba1832 | 526 | EXPORT_SYMBOL(netlbl_catmap_walk); |
02752760 PM |
527 | |
528 | /** | |
4fbe63d1 | 529 | * netlbl_catmap_walkrng - Find the end of a string of set bits |
02752760 PM |
530 | * @catmap: the category bitmap |
531 | * @offset: the offset to start searching at, in bits | |
532 | * | |
533 | * Description: | |
534 | * This function walks a LSM secattr category bitmap starting at @offset and | |
535 | * returns the spot of the first cleared bit or -ENOENT if the offset is past | |
536 | * the end of the bitmap. | |
537 | * | |
538 | */ | |
4fbe63d1 | 539 | int netlbl_catmap_walkrng(struct netlbl_lsm_catmap *catmap, u32 offset) |
02752760 | 540 | { |
4fbe63d1 PM |
541 | struct netlbl_lsm_catmap *iter; |
542 | struct netlbl_lsm_catmap *prev = NULL; | |
d960a618 PM |
543 | u32 idx; |
544 | u32 bit; | |
02752760 PM |
545 | NETLBL_CATMAP_MAPTYPE bitmask; |
546 | NETLBL_CATMAP_MAPTYPE bitmap; | |
547 | ||
4fbe63d1 | 548 | iter = _netlbl_catmap_getnode(&catmap, offset, _CM_F_WALK, 0); |
d960a618 PM |
549 | if (iter == NULL) |
550 | return -ENOENT; | |
02752760 | 551 | if (offset > iter->startbit) { |
d960a618 PM |
552 | offset -= iter->startbit; |
553 | idx = offset / NETLBL_CATMAP_MAPSIZE; | |
554 | bit = offset % NETLBL_CATMAP_MAPSIZE; | |
02752760 | 555 | } else { |
d960a618 PM |
556 | idx = 0; |
557 | bit = 0; | |
02752760 | 558 | } |
d960a618 | 559 | bitmask = NETLBL_CATMAP_BIT << bit; |
02752760 PM |
560 | |
561 | for (;;) { | |
d960a618 | 562 | bitmap = iter->bitmap[idx]; |
02752760 PM |
563 | while (bitmask != 0 && (bitmap & bitmask) != 0) { |
564 | bitmask <<= 1; | |
d960a618 | 565 | bit++; |
02752760 PM |
566 | } |
567 | ||
d960a618 PM |
568 | if (prev && idx == 0 && bit == 0) |
569 | return prev->startbit + NETLBL_CATMAP_SIZE - 1; | |
570 | else if (bitmask != 0) | |
02752760 | 571 | return iter->startbit + |
d960a618 PM |
572 | (NETLBL_CATMAP_MAPSIZE * idx) + bit - 1; |
573 | else if (++idx >= NETLBL_CATMAP_MAPCNT) { | |
02752760 | 574 | if (iter->next == NULL) |
d960a618 PM |
575 | return iter->startbit + NETLBL_CATMAP_SIZE - 1; |
576 | prev = iter; | |
02752760 | 577 | iter = iter->next; |
d960a618 | 578 | idx = 0; |
02752760 PM |
579 | } |
580 | bitmask = NETLBL_CATMAP_BIT; | |
d960a618 | 581 | bit = 0; |
02752760 PM |
582 | } |
583 | ||
584 | return -ENOENT; | |
585 | } | |
586 | ||
4b8feff2 | 587 | /** |
4fbe63d1 | 588 | * netlbl_catmap_getlong - Export an unsigned long bitmap |
4b8feff2 PM |
589 | * @catmap: pointer to the category bitmap |
590 | * @offset: pointer to the requested offset | |
591 | * @bitmap: the exported bitmap | |
592 | * | |
593 | * Description: | |
594 | * Export a bitmap with an offset greater than or equal to @offset and return | |
595 | * it in @bitmap. The @offset must be aligned to an unsigned long and will be | |
596 | * updated on return if different from what was requested; if the catmap is | |
597 | * empty at the requested offset and beyond, the @offset is set to (u32)-1. | |
598 | * Returns zero on sucess, negative values on failure. | |
599 | * | |
600 | */ | |
4fbe63d1 PM |
601 | int netlbl_catmap_getlong(struct netlbl_lsm_catmap *catmap, |
602 | u32 *offset, | |
603 | unsigned long *bitmap) | |
4b8feff2 | 604 | { |
4fbe63d1 | 605 | struct netlbl_lsm_catmap *iter; |
4b8feff2 PM |
606 | u32 off = *offset; |
607 | u32 idx; | |
608 | ||
609 | /* only allow aligned offsets */ | |
610 | if ((off & (BITS_PER_LONG - 1)) != 0) | |
611 | return -EINVAL; | |
612 | ||
613 | if (off < catmap->startbit) { | |
614 | off = catmap->startbit; | |
615 | *offset = off; | |
616 | } | |
50b8629a | 617 | iter = _netlbl_catmap_getnode(&catmap, off, _CM_F_WALK, 0); |
4b8feff2 PM |
618 | if (iter == NULL) { |
619 | *offset = (u32)-1; | |
620 | return 0; | |
621 | } | |
622 | ||
623 | if (off < iter->startbit) { | |
50b8629a PM |
624 | *offset = iter->startbit; |
625 | off = 0; | |
4b8feff2 PM |
626 | } else |
627 | off -= iter->startbit; | |
4b8feff2 | 628 | idx = off / NETLBL_CATMAP_MAPSIZE; |
50b8629a | 629 | *bitmap = iter->bitmap[idx] >> (off % NETLBL_CATMAP_MAPSIZE); |
4b8feff2 PM |
630 | |
631 | return 0; | |
632 | } | |
633 | ||
02752760 | 634 | /** |
4fbe63d1 | 635 | * netlbl_catmap_setbit - Set a bit in a LSM secattr catmap |
41c3bd20 | 636 | * @catmap: pointer to the category bitmap |
02752760 PM |
637 | * @bit: the bit to set |
638 | * @flags: memory allocation flags | |
639 | * | |
640 | * Description: | |
641 | * Set the bit specified by @bit in @catmap. Returns zero on success, | |
642 | * negative values on failure. | |
643 | * | |
644 | */ | |
4fbe63d1 PM |
645 | int netlbl_catmap_setbit(struct netlbl_lsm_catmap **catmap, |
646 | u32 bit, | |
647 | gfp_t flags) | |
02752760 | 648 | { |
4fbe63d1 | 649 | struct netlbl_lsm_catmap *iter; |
4b8feff2 | 650 | u32 idx; |
02752760 | 651 | |
4fbe63d1 | 652 | iter = _netlbl_catmap_getnode(catmap, bit, _CM_F_ALLOC, flags); |
4b8feff2 PM |
653 | if (iter == NULL) |
654 | return -ENOMEM; | |
02752760 | 655 | |
4b8feff2 PM |
656 | bit -= iter->startbit; |
657 | idx = bit / NETLBL_CATMAP_MAPSIZE; | |
658 | iter->bitmap[idx] |= NETLBL_CATMAP_BIT << (bit % NETLBL_CATMAP_MAPSIZE); | |
02752760 PM |
659 | |
660 | return 0; | |
661 | } | |
ceba1832 | 662 | EXPORT_SYMBOL(netlbl_catmap_setbit); |
02752760 PM |
663 | |
664 | /** | |
4fbe63d1 | 665 | * netlbl_catmap_setrng - Set a range of bits in a LSM secattr catmap |
41c3bd20 | 666 | * @catmap: pointer to the category bitmap |
02752760 PM |
667 | * @start: the starting bit |
668 | * @end: the last bit in the string | |
669 | * @flags: memory allocation flags | |
670 | * | |
671 | * Description: | |
672 | * Set a range of bits, starting at @start and ending with @end. Returns zero | |
673 | * on success, negative values on failure. | |
674 | * | |
675 | */ | |
4fbe63d1 PM |
676 | int netlbl_catmap_setrng(struct netlbl_lsm_catmap **catmap, |
677 | u32 start, | |
678 | u32 end, | |
679 | gfp_t flags) | |
02752760 | 680 | { |
4b8feff2 PM |
681 | int rc = 0; |
682 | u32 spot = start; | |
683 | ||
684 | while (rc == 0 && spot <= end) { | |
341e0cb5 | 685 | if (((spot & (BITS_PER_LONG - 1)) == 0) && |
4b8feff2 | 686 | ((end - spot) > BITS_PER_LONG)) { |
4fbe63d1 PM |
687 | rc = netlbl_catmap_setlong(catmap, |
688 | spot, | |
689 | (unsigned long)-1, | |
690 | flags); | |
4b8feff2 PM |
691 | spot += BITS_PER_LONG; |
692 | } else | |
4fbe63d1 | 693 | rc = netlbl_catmap_setbit(catmap, spot++, flags); |
02752760 PM |
694 | } |
695 | ||
4b8feff2 PM |
696 | return rc; |
697 | } | |
698 | ||
699 | /** | |
4fbe63d1 | 700 | * netlbl_catmap_setlong - Import an unsigned long bitmap |
4b8feff2 PM |
701 | * @catmap: pointer to the category bitmap |
702 | * @offset: offset to the start of the imported bitmap | |
703 | * @bitmap: the bitmap to import | |
704 | * @flags: memory allocation flags | |
705 | * | |
706 | * Description: | |
707 | * Import the bitmap specified in @bitmap into @catmap, using the offset | |
708 | * in @offset. The offset must be aligned to an unsigned long. Returns zero | |
709 | * on success, negative values on failure. | |
710 | * | |
711 | */ | |
4fbe63d1 PM |
712 | int netlbl_catmap_setlong(struct netlbl_lsm_catmap **catmap, |
713 | u32 offset, | |
714 | unsigned long bitmap, | |
715 | gfp_t flags) | |
4b8feff2 | 716 | { |
4fbe63d1 | 717 | struct netlbl_lsm_catmap *iter; |
4b8feff2 PM |
718 | u32 idx; |
719 | ||
720 | /* only allow aligned offsets */ | |
721 | if ((offset & (BITS_PER_LONG - 1)) != 0) | |
722 | return -EINVAL; | |
723 | ||
4fbe63d1 | 724 | iter = _netlbl_catmap_getnode(catmap, offset, _CM_F_ALLOC, flags); |
4b8feff2 PM |
725 | if (iter == NULL) |
726 | return -ENOMEM; | |
727 | ||
728 | offset -= iter->startbit; | |
729 | idx = offset / NETLBL_CATMAP_MAPSIZE; | |
730 | iter->bitmap[idx] |= bitmap << (offset % NETLBL_CATMAP_MAPSIZE); | |
731 | ||
732 | return 0; | |
02752760 PM |
733 | } |
734 | ||
3faa8f98 HD |
735 | /* Bitmap functions |
736 | */ | |
737 | ||
738 | /** | |
739 | * netlbl_bitmap_walk - Walk a bitmap looking for a bit | |
740 | * @bitmap: the bitmap | |
741 | * @bitmap_len: length in bits | |
742 | * @offset: starting offset | |
743 | * @state: if non-zero, look for a set (1) bit else look for a cleared (0) bit | |
744 | * | |
745 | * Description: | |
746 | * Starting at @offset, walk the bitmap from left to right until either the | |
747 | * desired bit is found or we reach the end. Return the bit offset, -1 if | |
748 | * not found, or -2 if error. | |
749 | */ | |
750 | int netlbl_bitmap_walk(const unsigned char *bitmap, u32 bitmap_len, | |
751 | u32 offset, u8 state) | |
752 | { | |
753 | u32 bit_spot; | |
754 | u32 byte_offset; | |
755 | unsigned char bitmask; | |
756 | unsigned char byte; | |
757 | ||
758 | byte_offset = offset / 8; | |
759 | byte = bitmap[byte_offset]; | |
760 | bit_spot = offset; | |
761 | bitmask = 0x80 >> (offset % 8); | |
762 | ||
763 | while (bit_spot < bitmap_len) { | |
764 | if ((state && (byte & bitmask) == bitmask) || | |
765 | (state == 0 && (byte & bitmask) == 0)) | |
766 | return bit_spot; | |
767 | ||
768 | bit_spot++; | |
769 | bitmask >>= 1; | |
770 | if (bitmask == 0) { | |
771 | byte = bitmap[++byte_offset]; | |
772 | bitmask = 0x80; | |
773 | } | |
774 | } | |
775 | ||
776 | return -1; | |
777 | } | |
778 | EXPORT_SYMBOL(netlbl_bitmap_walk); | |
779 | ||
780 | /** | |
781 | * netlbl_bitmap_setbit - Sets a single bit in a bitmap | |
782 | * @bitmap: the bitmap | |
783 | * @bit: the bit | |
784 | * @state: if non-zero, set the bit (1) else clear the bit (0) | |
785 | * | |
786 | * Description: | |
787 | * Set a single bit in the bitmask. Returns zero on success, negative values | |
788 | * on error. | |
789 | */ | |
790 | void netlbl_bitmap_setbit(unsigned char *bitmap, u32 bit, u8 state) | |
791 | { | |
792 | u32 byte_spot; | |
793 | u8 bitmask; | |
794 | ||
795 | /* gcc always rounds to zero when doing integer division */ | |
796 | byte_spot = bit / 8; | |
797 | bitmask = 0x80 >> (bit % 8); | |
798 | if (state) | |
799 | bitmap[byte_spot] |= bitmask; | |
800 | else | |
801 | bitmap[byte_spot] &= ~bitmask; | |
802 | } | |
803 | EXPORT_SYMBOL(netlbl_bitmap_setbit); | |
804 | ||
d15c345f PM |
805 | /* |
806 | * LSM Functions | |
807 | */ | |
808 | ||
23bcdc1a PM |
809 | /** |
810 | * netlbl_enabled - Determine if the NetLabel subsystem is enabled | |
811 | * | |
812 | * Description: | |
813 | * The LSM can use this function to determine if it should use NetLabel | |
814 | * security attributes in it's enforcement mechanism. Currently, NetLabel is | |
815 | * considered to be enabled when it's configuration contains a valid setup for | |
816 | * at least one labeled protocol (i.e. NetLabel can understand incoming | |
817 | * labeled packets of at least one type); otherwise NetLabel is considered to | |
818 | * be disabled. | |
819 | * | |
820 | */ | |
821 | int netlbl_enabled(void) | |
822 | { | |
823 | /* At some point we probably want to expose this mechanism to the user | |
824 | * as well so that admins can toggle NetLabel regardless of the | |
825 | * configuration */ | |
c783f1ce | 826 | return (atomic_read(&netlabel_mgmt_protocount) > 0); |
23bcdc1a PM |
827 | } |
828 | ||
d15c345f | 829 | /** |
389fb800 | 830 | * netlbl_sock_setattr - Label a socket using the correct protocol |
ba6ff9f2 | 831 | * @sk: the socket to label |
389fb800 | 832 | * @family: protocol family |
d15c345f PM |
833 | * @secattr: the security attributes |
834 | * | |
835 | * Description: | |
836 | * Attach the correct label to the given socket using the security attributes | |
ba6ff9f2 PM |
837 | * specified in @secattr. This function requires exclusive access to @sk, |
838 | * which means it either needs to be in the process of being created or locked. | |
63c41688 PM |
839 | * Returns zero on success, -EDESTADDRREQ if the domain is configured to use |
840 | * network address selectors (can't blindly label the socket), and negative | |
841 | * values on all other failures. | |
d15c345f PM |
842 | * |
843 | */ | |
ba6ff9f2 | 844 | int netlbl_sock_setattr(struct sock *sk, |
389fb800 | 845 | u16 family, |
ba6ff9f2 | 846 | const struct netlbl_lsm_secattr *secattr) |
d15c345f | 847 | { |
389fb800 | 848 | int ret_val; |
d15c345f PM |
849 | struct netlbl_dom_map *dom_entry; |
850 | ||
851 | rcu_read_lock(); | |
8f18e675 | 852 | dom_entry = netlbl_domhsh_getentry(secattr->domain, family); |
389fb800 PM |
853 | if (dom_entry == NULL) { |
854 | ret_val = -ENOENT; | |
d15c345f | 855 | goto socket_setattr_return; |
389fb800 PM |
856 | } |
857 | switch (family) { | |
858 | case AF_INET: | |
6a8b7f0c | 859 | switch (dom_entry->def.type) { |
389fb800 PM |
860 | case NETLBL_NLTYPE_ADDRSELECT: |
861 | ret_val = -EDESTADDRREQ; | |
862 | break; | |
863 | case NETLBL_NLTYPE_CIPSOV4: | |
864 | ret_val = cipso_v4_sock_setattr(sk, | |
6a8b7f0c PM |
865 | dom_entry->def.cipso, |
866 | secattr); | |
389fb800 PM |
867 | break; |
868 | case NETLBL_NLTYPE_UNLABELED: | |
869 | ret_val = 0; | |
870 | break; | |
871 | default: | |
872 | ret_val = -ENOENT; | |
873 | } | |
d15c345f | 874 | break; |
dfd56b8b | 875 | #if IS_ENABLED(CONFIG_IPV6) |
389fb800 | 876 | case AF_INET6: |
ceba1832 HD |
877 | switch (dom_entry->def.type) { |
878 | case NETLBL_NLTYPE_ADDRSELECT: | |
879 | ret_val = -EDESTADDRREQ; | |
880 | break; | |
881 | case NETLBL_NLTYPE_CALIPSO: | |
882 | ret_val = calipso_sock_setattr(sk, | |
883 | dom_entry->def.calipso, | |
884 | secattr); | |
885 | break; | |
886 | case NETLBL_NLTYPE_UNLABELED: | |
887 | ret_val = 0; | |
888 | break; | |
889 | default: | |
890 | ret_val = -ENOENT; | |
891 | } | |
d15c345f | 892 | break; |
389fb800 | 893 | #endif /* IPv6 */ |
d15c345f | 894 | default: |
389fb800 | 895 | ret_val = -EPROTONOSUPPORT; |
d15c345f PM |
896 | } |
897 | ||
898 | socket_setattr_return: | |
899 | rcu_read_unlock(); | |
900 | return ret_val; | |
901 | } | |
902 | ||
014ab19a PM |
903 | /** |
904 | * netlbl_sock_delattr - Delete all the NetLabel labels on a socket | |
905 | * @sk: the socket | |
906 | * | |
907 | * Description: | |
908 | * Remove all the NetLabel labeling from @sk. The caller is responsible for | |
909 | * ensuring that @sk is locked. | |
910 | * | |
911 | */ | |
912 | void netlbl_sock_delattr(struct sock *sk) | |
913 | { | |
0e0e3677 PM |
914 | switch (sk->sk_family) { |
915 | case AF_INET: | |
916 | cipso_v4_sock_delattr(sk); | |
917 | break; | |
ceba1832 HD |
918 | #if IS_ENABLED(CONFIG_IPV6) |
919 | case AF_INET6: | |
920 | calipso_sock_delattr(sk); | |
921 | break; | |
922 | #endif /* IPv6 */ | |
0e0e3677 | 923 | } |
014ab19a PM |
924 | } |
925 | ||
14a72f53 PM |
926 | /** |
927 | * netlbl_sock_getattr - Determine the security attributes of a sock | |
928 | * @sk: the sock | |
929 | * @secattr: the security attributes | |
930 | * | |
931 | * Description: | |
8cc44579 | 932 | * Examines the given sock to see if any NetLabel style labeling has been |
14a72f53 PM |
933 | * applied to the sock, if so it parses the socket label and returns the |
934 | * security attributes in @secattr. Returns zero on success, negative values | |
935 | * on failure. | |
936 | * | |
937 | */ | |
389fb800 PM |
938 | int netlbl_sock_getattr(struct sock *sk, |
939 | struct netlbl_lsm_secattr *secattr) | |
14a72f53 | 940 | { |
389fb800 PM |
941 | int ret_val; |
942 | ||
943 | switch (sk->sk_family) { | |
944 | case AF_INET: | |
945 | ret_val = cipso_v4_sock_getattr(sk, secattr); | |
946 | break; | |
dfd56b8b | 947 | #if IS_ENABLED(CONFIG_IPV6) |
389fb800 | 948 | case AF_INET6: |
ceba1832 | 949 | ret_val = calipso_sock_getattr(sk, secattr); |
389fb800 PM |
950 | break; |
951 | #endif /* IPv6 */ | |
952 | default: | |
953 | ret_val = -EPROTONOSUPPORT; | |
954 | } | |
955 | ||
956 | return ret_val; | |
14a72f53 PM |
957 | } |
958 | ||
014ab19a PM |
959 | /** |
960 | * netlbl_conn_setattr - Label a connected socket using the correct protocol | |
961 | * @sk: the socket to label | |
962 | * @addr: the destination address | |
963 | * @secattr: the security attributes | |
964 | * | |
965 | * Description: | |
966 | * Attach the correct label to the given connected socket using the security | |
967 | * attributes specified in @secattr. The caller is responsible for ensuring | |
968 | * that @sk is locked. Returns zero on success, negative values on failure. | |
969 | * | |
970 | */ | |
971 | int netlbl_conn_setattr(struct sock *sk, | |
972 | struct sockaddr *addr, | |
973 | const struct netlbl_lsm_secattr *secattr) | |
974 | { | |
975 | int ret_val; | |
976 | struct sockaddr_in *addr4; | |
ceba1832 HD |
977 | #if IS_ENABLED(CONFIG_IPV6) |
978 | struct sockaddr_in6 *addr6; | |
979 | #endif | |
6a8b7f0c | 980 | struct netlbl_dommap_def *entry; |
014ab19a PM |
981 | |
982 | rcu_read_lock(); | |
983 | switch (addr->sa_family) { | |
984 | case AF_INET: | |
985 | addr4 = (struct sockaddr_in *)addr; | |
6a8b7f0c PM |
986 | entry = netlbl_domhsh_getentry_af4(secattr->domain, |
987 | addr4->sin_addr.s_addr); | |
988 | if (entry == NULL) { | |
014ab19a PM |
989 | ret_val = -ENOENT; |
990 | goto conn_setattr_return; | |
991 | } | |
6a8b7f0c | 992 | switch (entry->type) { |
014ab19a PM |
993 | case NETLBL_NLTYPE_CIPSOV4: |
994 | ret_val = cipso_v4_sock_setattr(sk, | |
6a8b7f0c | 995 | entry->cipso, secattr); |
014ab19a PM |
996 | break; |
997 | case NETLBL_NLTYPE_UNLABELED: | |
998 | /* just delete the protocols we support for right now | |
999 | * but we could remove other protocols if needed */ | |
ceba1832 | 1000 | netlbl_sock_delattr(sk); |
014ab19a PM |
1001 | ret_val = 0; |
1002 | break; | |
1003 | default: | |
1004 | ret_val = -ENOENT; | |
1005 | } | |
1006 | break; | |
dfd56b8b | 1007 | #if IS_ENABLED(CONFIG_IPV6) |
014ab19a | 1008 | case AF_INET6: |
ceba1832 HD |
1009 | addr6 = (struct sockaddr_in6 *)addr; |
1010 | entry = netlbl_domhsh_getentry_af6(secattr->domain, | |
1011 | &addr6->sin6_addr); | |
1012 | if (entry == NULL) { | |
1013 | ret_val = -ENOENT; | |
1014 | goto conn_setattr_return; | |
1015 | } | |
1016 | switch (entry->type) { | |
1017 | case NETLBL_NLTYPE_CALIPSO: | |
1018 | ret_val = calipso_sock_setattr(sk, | |
1019 | entry->calipso, secattr); | |
1020 | break; | |
1021 | case NETLBL_NLTYPE_UNLABELED: | |
1022 | /* just delete the protocols we support for right now | |
1023 | * but we could remove other protocols if needed */ | |
1024 | netlbl_sock_delattr(sk); | |
1025 | ret_val = 0; | |
1026 | break; | |
1027 | default: | |
1028 | ret_val = -ENOENT; | |
1029 | } | |
014ab19a PM |
1030 | break; |
1031 | #endif /* IPv6 */ | |
1032 | default: | |
389fb800 | 1033 | ret_val = -EPROTONOSUPPORT; |
014ab19a PM |
1034 | } |
1035 | ||
1036 | conn_setattr_return: | |
1037 | rcu_read_unlock(); | |
1038 | return ret_val; | |
1039 | } | |
1040 | ||
389fb800 PM |
1041 | /** |
1042 | * netlbl_req_setattr - Label a request socket using the correct protocol | |
1043 | * @req: the request socket to label | |
1044 | * @secattr: the security attributes | |
1045 | * | |
1046 | * Description: | |
1047 | * Attach the correct label to the given socket using the security attributes | |
1048 | * specified in @secattr. Returns zero on success, negative values on failure. | |
1049 | * | |
1050 | */ | |
1051 | int netlbl_req_setattr(struct request_sock *req, | |
1052 | const struct netlbl_lsm_secattr *secattr) | |
1053 | { | |
1054 | int ret_val; | |
6a8b7f0c | 1055 | struct netlbl_dommap_def *entry; |
e1adea92 | 1056 | struct inet_request_sock *ireq = inet_rsk(req); |
389fb800 PM |
1057 | |
1058 | rcu_read_lock(); | |
389fb800 PM |
1059 | switch (req->rsk_ops->family) { |
1060 | case AF_INET: | |
6a8b7f0c | 1061 | entry = netlbl_domhsh_getentry_af4(secattr->domain, |
e1adea92 | 1062 | ireq->ir_rmt_addr); |
6a8b7f0c PM |
1063 | if (entry == NULL) { |
1064 | ret_val = -ENOENT; | |
1065 | goto req_setattr_return; | |
389fb800 | 1066 | } |
6a8b7f0c | 1067 | switch (entry->type) { |
389fb800 | 1068 | case NETLBL_NLTYPE_CIPSOV4: |
6a8b7f0c PM |
1069 | ret_val = cipso_v4_req_setattr(req, |
1070 | entry->cipso, secattr); | |
389fb800 PM |
1071 | break; |
1072 | case NETLBL_NLTYPE_UNLABELED: | |
e1adea92 | 1073 | netlbl_req_delattr(req); |
389fb800 PM |
1074 | ret_val = 0; |
1075 | break; | |
1076 | default: | |
1077 | ret_val = -ENOENT; | |
1078 | } | |
1079 | break; | |
dfd56b8b | 1080 | #if IS_ENABLED(CONFIG_IPV6) |
389fb800 | 1081 | case AF_INET6: |
e1adea92 HD |
1082 | entry = netlbl_domhsh_getentry_af6(secattr->domain, |
1083 | &ireq->ir_v6_rmt_addr); | |
1084 | if (entry == NULL) { | |
1085 | ret_val = -ENOENT; | |
1086 | goto req_setattr_return; | |
1087 | } | |
1088 | switch (entry->type) { | |
1089 | case NETLBL_NLTYPE_CALIPSO: | |
1090 | ret_val = calipso_req_setattr(req, | |
1091 | entry->calipso, secattr); | |
1092 | break; | |
1093 | case NETLBL_NLTYPE_UNLABELED: | |
1094 | netlbl_req_delattr(req); | |
1095 | ret_val = 0; | |
1096 | break; | |
1097 | default: | |
1098 | ret_val = -ENOENT; | |
1099 | } | |
389fb800 PM |
1100 | break; |
1101 | #endif /* IPv6 */ | |
1102 | default: | |
1103 | ret_val = -EPROTONOSUPPORT; | |
1104 | } | |
1105 | ||
1106 | req_setattr_return: | |
1107 | rcu_read_unlock(); | |
1108 | return ret_val; | |
1109 | } | |
1110 | ||
07feee8f PM |
1111 | /** |
1112 | * netlbl_req_delattr - Delete all the NetLabel labels on a socket | |
1113 | * @req: the socket | |
1114 | * | |
1115 | * Description: | |
1116 | * Remove all the NetLabel labeling from @req. | |
1117 | * | |
1118 | */ | |
1119 | void netlbl_req_delattr(struct request_sock *req) | |
1120 | { | |
0e0e3677 PM |
1121 | switch (req->rsk_ops->family) { |
1122 | case AF_INET: | |
1123 | cipso_v4_req_delattr(req); | |
1124 | break; | |
e1adea92 HD |
1125 | #if IS_ENABLED(CONFIG_IPV6) |
1126 | case AF_INET6: | |
1127 | calipso_req_delattr(req); | |
1128 | break; | |
1129 | #endif /* IPv6 */ | |
0e0e3677 | 1130 | } |
07feee8f PM |
1131 | } |
1132 | ||
948bf85c PM |
1133 | /** |
1134 | * netlbl_skbuff_setattr - Label a packet using the correct protocol | |
1135 | * @skb: the packet | |
1136 | * @family: protocol family | |
1137 | * @secattr: the security attributes | |
1138 | * | |
1139 | * Description: | |
1140 | * Attach the correct label to the given packet using the security attributes | |
1141 | * specified in @secattr. Returns zero on success, negative values on failure. | |
1142 | * | |
1143 | */ | |
1144 | int netlbl_skbuff_setattr(struct sk_buff *skb, | |
1145 | u16 family, | |
1146 | const struct netlbl_lsm_secattr *secattr) | |
1147 | { | |
1148 | int ret_val; | |
1149 | struct iphdr *hdr4; | |
2917f57b HD |
1150 | #if IS_ENABLED(CONFIG_IPV6) |
1151 | struct ipv6hdr *hdr6; | |
1152 | #endif | |
6a8b7f0c | 1153 | struct netlbl_dommap_def *entry; |
948bf85c PM |
1154 | |
1155 | rcu_read_lock(); | |
1156 | switch (family) { | |
1157 | case AF_INET: | |
1158 | hdr4 = ip_hdr(skb); | |
2917f57b HD |
1159 | entry = netlbl_domhsh_getentry_af4(secattr->domain, |
1160 | hdr4->daddr); | |
6a8b7f0c | 1161 | if (entry == NULL) { |
948bf85c PM |
1162 | ret_val = -ENOENT; |
1163 | goto skbuff_setattr_return; | |
1164 | } | |
6a8b7f0c | 1165 | switch (entry->type) { |
948bf85c | 1166 | case NETLBL_NLTYPE_CIPSOV4: |
6a8b7f0c PM |
1167 | ret_val = cipso_v4_skbuff_setattr(skb, entry->cipso, |
1168 | secattr); | |
948bf85c PM |
1169 | break; |
1170 | case NETLBL_NLTYPE_UNLABELED: | |
1171 | /* just delete the protocols we support for right now | |
1172 | * but we could remove other protocols if needed */ | |
1173 | ret_val = cipso_v4_skbuff_delattr(skb); | |
1174 | break; | |
1175 | default: | |
1176 | ret_val = -ENOENT; | |
1177 | } | |
1178 | break; | |
dfd56b8b | 1179 | #if IS_ENABLED(CONFIG_IPV6) |
948bf85c | 1180 | case AF_INET6: |
2917f57b HD |
1181 | hdr6 = ipv6_hdr(skb); |
1182 | entry = netlbl_domhsh_getentry_af6(secattr->domain, | |
1183 | &hdr6->daddr); | |
1184 | if (entry == NULL) { | |
1185 | ret_val = -ENOENT; | |
1186 | goto skbuff_setattr_return; | |
1187 | } | |
1188 | switch (entry->type) { | |
1189 | case NETLBL_NLTYPE_CALIPSO: | |
1190 | ret_val = calipso_skbuff_setattr(skb, entry->calipso, | |
1191 | secattr); | |
1192 | break; | |
1193 | case NETLBL_NLTYPE_UNLABELED: | |
1194 | /* just delete the protocols we support for right now | |
1195 | * but we could remove other protocols if needed */ | |
1196 | ret_val = calipso_skbuff_delattr(skb); | |
1197 | break; | |
1198 | default: | |
1199 | ret_val = -ENOENT; | |
1200 | } | |
948bf85c PM |
1201 | break; |
1202 | #endif /* IPv6 */ | |
1203 | default: | |
389fb800 | 1204 | ret_val = -EPROTONOSUPPORT; |
948bf85c PM |
1205 | } |
1206 | ||
1207 | skbuff_setattr_return: | |
1208 | rcu_read_unlock(); | |
1209 | return ret_val; | |
1210 | } | |
1211 | ||
d15c345f PM |
1212 | /** |
1213 | * netlbl_skbuff_getattr - Determine the security attributes of a packet | |
1214 | * @skb: the packet | |
75e22910 | 1215 | * @family: protocol family |
d15c345f PM |
1216 | * @secattr: the security attributes |
1217 | * | |
1218 | * Description: | |
1219 | * Examines the given packet to see if a recognized form of packet labeling | |
1220 | * is present, if so it parses the packet label and returns the security | |
1221 | * attributes in @secattr. Returns zero on success, negative values on | |
1222 | * failure. | |
1223 | * | |
1224 | */ | |
1225 | int netlbl_skbuff_getattr(const struct sk_buff *skb, | |
75e22910 | 1226 | u16 family, |
d15c345f PM |
1227 | struct netlbl_lsm_secattr *secattr) |
1228 | { | |
04f81f01 PM |
1229 | unsigned char *ptr; |
1230 | ||
389fb800 PM |
1231 | switch (family) { |
1232 | case AF_INET: | |
04f81f01 PM |
1233 | ptr = cipso_v4_optptr(skb); |
1234 | if (ptr && cipso_v4_getattr(ptr, secattr) == 0) | |
389fb800 PM |
1235 | return 0; |
1236 | break; | |
dfd56b8b | 1237 | #if IS_ENABLED(CONFIG_IPV6) |
389fb800 | 1238 | case AF_INET6: |
2917f57b HD |
1239 | ptr = calipso_optptr(skb); |
1240 | if (ptr && calipso_getattr(ptr, secattr) == 0) | |
1241 | return 0; | |
389fb800 PM |
1242 | break; |
1243 | #endif /* IPv6 */ | |
1244 | } | |
d15c345f | 1245 | |
8cc44579 | 1246 | return netlbl_unlabel_getattr(skb, family, secattr); |
d15c345f PM |
1247 | } |
1248 | ||
1249 | /** | |
1250 | * netlbl_skbuff_err - Handle a LSM error on a sk_buff | |
1251 | * @skb: the packet | |
a04e71f6 | 1252 | * @family: the family |
d15c345f | 1253 | * @error: the error code |
dfaebe98 | 1254 | * @gateway: true if host is acting as a gateway, false otherwise |
d15c345f PM |
1255 | * |
1256 | * Description: | |
1257 | * Deal with a LSM problem when handling the packet in @skb, typically this is | |
1258 | * a permission denied problem (-EACCES). The correct action is determined | |
1259 | * according to the packet's labeling protocol. | |
1260 | * | |
1261 | */ | |
a04e71f6 | 1262 | void netlbl_skbuff_err(struct sk_buff *skb, u16 family, int error, int gateway) |
d15c345f | 1263 | { |
a04e71f6 HD |
1264 | switch (family) { |
1265 | case AF_INET: | |
1266 | if (cipso_v4_optptr(skb)) | |
1267 | cipso_v4_error(skb, error, gateway); | |
1268 | break; | |
1269 | } | |
d15c345f PM |
1270 | } |
1271 | ||
1272 | /** | |
1273 | * netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches | |
1274 | * | |
1275 | * Description: | |
1276 | * For all of the NetLabel protocols that support some form of label mapping | |
1277 | * cache, invalidate the cache. Returns zero on success, negative values on | |
1278 | * error. | |
1279 | * | |
1280 | */ | |
1281 | void netlbl_cache_invalidate(void) | |
1282 | { | |
1283 | cipso_v4_cache_invalidate(); | |
4fee5242 HD |
1284 | #if IS_ENABLED(CONFIG_IPV6) |
1285 | calipso_cache_invalidate(); | |
1286 | #endif /* IPv6 */ | |
d15c345f PM |
1287 | } |
1288 | ||
1289 | /** | |
1290 | * netlbl_cache_add - Add an entry to a NetLabel protocol cache | |
1291 | * @skb: the packet | |
4fee5242 | 1292 | * @family: the family |
d15c345f PM |
1293 | * @secattr: the packet's security attributes |
1294 | * | |
1295 | * Description: | |
1296 | * Add the LSM security attributes for the given packet to the underlying | |
1297 | * NetLabel protocol's label mapping cache. Returns zero on success, negative | |
1298 | * values on error. | |
1299 | * | |
1300 | */ | |
4fee5242 | 1301 | int netlbl_cache_add(const struct sk_buff *skb, u16 family, |
d15c345f PM |
1302 | const struct netlbl_lsm_secattr *secattr) |
1303 | { | |
04f81f01 PM |
1304 | unsigned char *ptr; |
1305 | ||
701a90ba | 1306 | if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0) |
d15c345f PM |
1307 | return -ENOMSG; |
1308 | ||
4fee5242 HD |
1309 | switch (family) { |
1310 | case AF_INET: | |
1311 | ptr = cipso_v4_optptr(skb); | |
1312 | if (ptr) | |
1313 | return cipso_v4_cache_add(ptr, secattr); | |
1314 | break; | |
1315 | #if IS_ENABLED(CONFIG_IPV6) | |
1316 | case AF_INET6: | |
1317 | ptr = calipso_optptr(skb); | |
1318 | if (ptr) | |
1319 | return calipso_cache_add(ptr, secattr); | |
1320 | break; | |
1321 | #endif /* IPv6 */ | |
1322 | } | |
d15c345f PM |
1323 | return -ENOMSG; |
1324 | } | |
1325 | ||
6c2e8ac0 PM |
1326 | /* |
1327 | * Protocol Engine Functions | |
1328 | */ | |
1329 | ||
1330 | /** | |
1331 | * netlbl_audit_start - Start an audit message | |
1332 | * @type: audit message type | |
1333 | * @audit_info: NetLabel audit information | |
1334 | * | |
1335 | * Description: | |
1336 | * Start an audit message using the type specified in @type and fill the audit | |
1337 | * message with some fields common to all NetLabel audit messages. This | |
1338 | * function should only be used by protocol engines, not LSMs. Returns a | |
1339 | * pointer to the audit buffer on success, NULL on failure. | |
1340 | * | |
1341 | */ | |
1342 | struct audit_buffer *netlbl_audit_start(int type, | |
1343 | struct netlbl_audit *audit_info) | |
1344 | { | |
1345 | return netlbl_audit_start_common(type, audit_info); | |
1346 | } | |
cb72d382 | 1347 | EXPORT_SYMBOL(netlbl_audit_start); |
6c2e8ac0 | 1348 | |
d15c345f PM |
1349 | /* |
1350 | * Setup Functions | |
1351 | */ | |
1352 | ||
1353 | /** | |
1354 | * netlbl_init - Initialize NetLabel | |
1355 | * | |
1356 | * Description: | |
1357 | * Perform the required NetLabel initialization before first use. | |
1358 | * | |
1359 | */ | |
1360 | static int __init netlbl_init(void) | |
1361 | { | |
1362 | int ret_val; | |
1363 | ||
1364 | printk(KERN_INFO "NetLabel: Initializing\n"); | |
1365 | printk(KERN_INFO "NetLabel: domain hash size = %u\n", | |
1366 | (1 << NETLBL_DOMHSH_BITSIZE)); | |
1367 | printk(KERN_INFO "NetLabel: protocols =" | |
1368 | " UNLABELED" | |
1369 | " CIPSOv4" | |
1370 | "\n"); | |
1371 | ||
1372 | ret_val = netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE); | |
1373 | if (ret_val != 0) | |
1374 | goto init_failure; | |
1375 | ||
8cc44579 PM |
1376 | ret_val = netlbl_unlabel_init(NETLBL_UNLHSH_BITSIZE); |
1377 | if (ret_val != 0) | |
1378 | goto init_failure; | |
1379 | ||
d15c345f PM |
1380 | ret_val = netlbl_netlink_init(); |
1381 | if (ret_val != 0) | |
1382 | goto init_failure; | |
1383 | ||
1384 | ret_val = netlbl_unlabel_defconf(); | |
1385 | if (ret_val != 0) | |
1386 | goto init_failure; | |
1387 | printk(KERN_INFO "NetLabel: unlabeled traffic allowed by default\n"); | |
1388 | ||
1389 | return 0; | |
1390 | ||
1391 | init_failure: | |
1392 | panic("NetLabel: failed to initialize properly (%d)\n", ret_val); | |
1393 | } | |
1394 | ||
1395 | subsys_initcall(netlbl_init); |