blob: 1b83e0009d8d4b7fa965dc21552699b905a2ca04 [file] [log] [blame]
Paul Moored15c3452006-08-03 16:48:37 -07001/*
2 * NetLabel Kernel API
3 *
4 * This file defines the kernel API for the NetLabel system. The NetLabel
5 * system manages static and dynamic label mappings for network protocols such
6 * as CIPSO and RIPSO.
7 *
8 * Author: Paul Moore <paul.moore@hp.com>
9 *
10 */
11
12/*
Paul Moore014ab192008-10-10 10:16:33 -040013 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008
Paul Moored15c3452006-08-03 16:48:37 -070014 *
15 * This program is free software; you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License as published by
17 * the Free Software Foundation; either version 2 of the License, or
18 * (at your option) any later version.
19 *
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
23 * the GNU General Public License for more details.
24 *
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
28 *
29 */
30
31#include <linux/init.h>
32#include <linux/types.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090033#include <linux/slab.h>
Paul Mooreeda61d32008-02-04 22:29:47 -080034#include <linux/audit.h>
Paul Moore6c2e8ac2008-12-31 12:54:11 -050035#include <linux/in.h>
36#include <linux/in6.h>
Paul Moored15c3452006-08-03 16:48:37 -070037#include <net/ip.h>
Paul Moore6c2e8ac2008-12-31 12:54:11 -050038#include <net/ipv6.h>
Paul Moored15c3452006-08-03 16:48:37 -070039#include <net/netlabel.h>
40#include <net/cipso_ipv4.h>
41#include <asm/bug.h>
Paul Moorec783f1c2008-01-29 08:37:52 -050042#include <asm/atomic.h>
Paul Moored15c3452006-08-03 16:48:37 -070043
44#include "netlabel_domainhash.h"
45#include "netlabel_unlabeled.h"
Paul Mooreeda61d32008-02-04 22:29:47 -080046#include "netlabel_cipso_v4.h"
Paul Moored15c3452006-08-03 16:48:37 -070047#include "netlabel_user.h"
Paul Moore23bcdc12007-07-18 12:28:45 -040048#include "netlabel_mgmt.h"
Paul Moore6c2e8ac2008-12-31 12:54:11 -050049#include "netlabel_addrlist.h"
Paul Moored15c3452006-08-03 16:48:37 -070050
51/*
Paul Mooreeda61d32008-02-04 22:29:47 -080052 * Configuration Functions
53 */
54
55/**
56 * netlbl_cfg_map_del - Remove a NetLabel/LSM domain mapping
57 * @domain: the domain mapping to remove
Paul Moore6c2e8ac2008-12-31 12:54:11 -050058 * @family: address family
59 * @addr: IP address
60 * @mask: IP address mask
Paul Mooreeda61d32008-02-04 22:29:47 -080061 * @audit_info: NetLabel audit information
62 *
63 * Description:
64 * Removes a NetLabel/LSM domain mapping. A @domain value of NULL causes the
65 * default domain mapping to be removed. Returns zero on success, negative
66 * values on failure.
67 *
68 */
Paul Moore6c2e8ac2008-12-31 12:54:11 -050069int netlbl_cfg_map_del(const char *domain,
70 u16 family,
71 const void *addr,
72 const void *mask,
73 struct netlbl_audit *audit_info)
Paul Mooreeda61d32008-02-04 22:29:47 -080074{
Paul Moore6c2e8ac2008-12-31 12:54:11 -050075 if (addr == NULL && mask == NULL) {
76 return netlbl_domhsh_remove(domain, audit_info);
77 } else if (addr != NULL && mask != NULL) {
78 switch (family) {
79 case AF_INET:
80 return netlbl_domhsh_remove_af4(domain, addr, mask,
81 audit_info);
82 default:
83 return -EPFNOSUPPORT;
84 }
85 } else
86 return -EINVAL;
Paul Mooreeda61d32008-02-04 22:29:47 -080087}
88
89/**
Paul Moore6c2e8ac2008-12-31 12:54:11 -050090 * netlbl_cfg_unlbl_map_add - Add a new unlabeled mapping
Paul Mooreeda61d32008-02-04 22:29:47 -080091 * @domain: the domain mapping to add
Paul Moore6c2e8ac2008-12-31 12:54:11 -050092 * @family: address family
93 * @addr: IP address
94 * @mask: IP address mask
Paul Mooreeda61d32008-02-04 22:29:47 -080095 * @audit_info: NetLabel audit information
96 *
97 * Description:
98 * Adds a new unlabeled NetLabel/LSM domain mapping. A @domain value of NULL
99 * causes a new default domain mapping to be added. Returns zero on success,
100 * negative values on failure.
101 *
102 */
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500103int netlbl_cfg_unlbl_map_add(const char *domain,
104 u16 family,
105 const void *addr,
106 const void *mask,
Paul Mooreeda61d32008-02-04 22:29:47 -0800107 struct netlbl_audit *audit_info)
108{
109 int ret_val = -ENOMEM;
110 struct netlbl_dom_map *entry;
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500111 struct netlbl_domaddr_map *addrmap = NULL;
112 struct netlbl_domaddr4_map *map4 = NULL;
113 struct netlbl_domaddr6_map *map6 = NULL;
114 const struct in_addr *addr4, *mask4;
115 const struct in6_addr *addr6, *mask6;
Paul Mooreeda61d32008-02-04 22:29:47 -0800116
117 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
118 if (entry == NULL)
Paul Moore948a7242008-10-10 10:16:30 -0400119 return -ENOMEM;
Paul Mooreeda61d32008-02-04 22:29:47 -0800120 if (domain != NULL) {
121 entry->domain = kstrdup(domain, GFP_ATOMIC);
122 if (entry->domain == NULL)
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500123 goto cfg_unlbl_map_add_failure;
Paul Mooreeda61d32008-02-04 22:29:47 -0800124 }
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500125
126 if (addr == NULL && mask == NULL)
127 entry->type = NETLBL_NLTYPE_UNLABELED;
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) {
136 case AF_INET:
137 addr4 = addr;
138 mask4 = mask;
139 map4 = kzalloc(sizeof(*map4), GFP_ATOMIC);
140 if (map4 == NULL)
141 goto cfg_unlbl_map_add_failure;
142 map4->type = NETLBL_NLTYPE_UNLABELED;
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;
151 case AF_INET6:
152 addr6 = addr;
153 mask6 = mask;
154 map6 = kzalloc(sizeof(*map6), GFP_ATOMIC);
Julia Lawallca7daea2009-07-30 04:38:19 +0000155 if (map6 == NULL)
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500156 goto cfg_unlbl_map_add_failure;
157 map6->type = NETLBL_NLTYPE_UNLABELED;
158 ipv6_addr_copy(&map6->list.addr, addr6);
159 map6->list.addr.s6_addr32[0] &= mask6->s6_addr32[0];
160 map6->list.addr.s6_addr32[1] &= mask6->s6_addr32[1];
161 map6->list.addr.s6_addr32[2] &= mask6->s6_addr32[2];
162 map6->list.addr.s6_addr32[3] &= mask6->s6_addr32[3];
163 ipv6_addr_copy(&map6->list.mask, mask6);
164 map6->list.valid = 1;
165 ret_val = netlbl_af4list_add(&map4->list,
166 &addrmap->list4);
167 if (ret_val != 0)
168 goto cfg_unlbl_map_add_failure;
169 break;
170 default:
171 goto cfg_unlbl_map_add_failure;
172 break;
173 }
174
175 entry->type_def.addrsel = addrmap;
176 entry->type = NETLBL_NLTYPE_ADDRSELECT;
177 } else {
178 ret_val = -EINVAL;
179 goto cfg_unlbl_map_add_failure;
180 }
Paul Mooreeda61d32008-02-04 22:29:47 -0800181
182 ret_val = netlbl_domhsh_add(entry, audit_info);
183 if (ret_val != 0)
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500184 goto cfg_unlbl_map_add_failure;
Paul Mooreeda61d32008-02-04 22:29:47 -0800185
186 return 0;
187
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500188cfg_unlbl_map_add_failure:
Julia Lawall47943232009-07-27 06:15:43 +0000189 kfree(entry->domain);
Paul Mooreeda61d32008-02-04 22:29:47 -0800190 kfree(entry);
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500191 kfree(addrmap);
192 kfree(map4);
193 kfree(map6);
Paul Mooreeda61d32008-02-04 22:29:47 -0800194 return ret_val;
195}
196
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500197
Paul Mooreeda61d32008-02-04 22:29:47 -0800198/**
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500199 * 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
Paul Mooreeda61d32008-02-04 22:29:47 -0800206 * @audit_info: NetLabel audit information
207 *
208 * Description:
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500209 * 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.
Paul Mooreeda61d32008-02-04 22:29:47 -0800212 *
213 */
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500214int netlbl_cfg_unlbl_static_add(struct net *net,
215 const char *dev_name,
216 const void *addr,
217 const void *mask,
218 u16 family,
219 u32 secid,
220 struct netlbl_audit *audit_info)
221{
222 u32 addr_len;
223
224 switch (family) {
225 case AF_INET:
226 addr_len = sizeof(struct in_addr);
227 break;
228 case AF_INET6:
229 addr_len = sizeof(struct in6_addr);
230 break;
231 default:
232 return -EPFNOSUPPORT;
233 }
234
235 return netlbl_unlhsh_add(net,
236 dev_name, addr, mask, addr_len,
237 secid, audit_info);
238}
239
240/**
241 * netlbl_cfg_unlbl_static_del - Removes an existing static label
242 * @net: network namespace
243 * @dev_name: interface name
244 * @addr: IP address in network byte order (struct in[6]_addr)
245 * @mask: address mask in network byte order (struct in[6]_addr)
246 * @family: address family
247 * @secid: LSM secid value for the entry
248 * @audit_info: NetLabel audit information
249 *
250 * Description:
251 * Removes an existing NetLabel static label used when protocol provided labels
252 * are not present on incoming traffic. If @dev_name is NULL then the default
253 * interface will be used. Returns zero on success, negative values on failure.
254 *
255 */
256int netlbl_cfg_unlbl_static_del(struct net *net,
257 const char *dev_name,
258 const void *addr,
259 const void *mask,
260 u16 family,
261 struct netlbl_audit *audit_info)
262{
263 u32 addr_len;
264
265 switch (family) {
266 case AF_INET:
267 addr_len = sizeof(struct in_addr);
268 break;
269 case AF_INET6:
270 addr_len = sizeof(struct in6_addr);
271 break;
272 default:
273 return -EPFNOSUPPORT;
274 }
275
276 return netlbl_unlhsh_remove(net,
277 dev_name, addr, mask, addr_len,
278 audit_info);
279}
280
281/**
282 * netlbl_cfg_cipsov4_add - Add a new CIPSOv4 DOI definition
283 * @doi_def: CIPSO DOI definition
284 * @audit_info: NetLabel audit information
285 *
286 * Description:
287 * Add a new CIPSO DOI definition as defined by @doi_def. Returns zero on
288 * success and negative values on failure.
289 *
290 */
291int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def,
292 struct netlbl_audit *audit_info)
293{
294 return cipso_v4_doi_add(doi_def, audit_info);
295}
296
297/**
298 * netlbl_cfg_cipsov4_del - Remove an existing CIPSOv4 DOI definition
299 * @doi: CIPSO DOI
300 * @audit_info: NetLabel audit information
301 *
302 * Description:
303 * Remove an existing CIPSO DOI definition matching @doi. Returns zero on
304 * success and negative values on failure.
305 *
306 */
307void netlbl_cfg_cipsov4_del(u32 doi, struct netlbl_audit *audit_info)
308{
309 cipso_v4_doi_remove(doi, audit_info);
310}
311
312/**
313 * netlbl_cfg_cipsov4_map_add - Add a new CIPSOv4 DOI mapping
314 * @doi: the CIPSO DOI
315 * @domain: the domain mapping to add
316 * @addr: IP address
317 * @mask: IP address mask
318 * @audit_info: NetLabel audit information
319 *
320 * Description:
321 * Add a new NetLabel/LSM domain mapping for the given CIPSO DOI to the NetLabel
322 * subsystem. A @domain value of NULL adds a new default domain mapping.
323 * Returns zero on success, negative values on failure.
324 *
325 */
326int netlbl_cfg_cipsov4_map_add(u32 doi,
Paul Mooreeda61d32008-02-04 22:29:47 -0800327 const char *domain,
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500328 const struct in_addr *addr,
329 const struct in_addr *mask,
Paul Mooreeda61d32008-02-04 22:29:47 -0800330 struct netlbl_audit *audit_info)
331{
332 int ret_val = -ENOMEM;
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500333 struct cipso_v4_doi *doi_def;
Paul Mooreeda61d32008-02-04 22:29:47 -0800334 struct netlbl_dom_map *entry;
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500335 struct netlbl_domaddr_map *addrmap = NULL;
336 struct netlbl_domaddr4_map *addrinfo = NULL;
Paul Mooreeda61d32008-02-04 22:29:47 -0800337
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500338 doi_def = cipso_v4_doi_getdef(doi);
339 if (doi_def == NULL)
340 return -ENOENT;
Paul Mooreb1edeb12008-10-10 10:16:31 -0400341
Paul Mooreeda61d32008-02-04 22:29:47 -0800342 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
343 if (entry == NULL)
Paul Moore948a7242008-10-10 10:16:30 -0400344 return -ENOMEM;
Paul Mooreeda61d32008-02-04 22:29:47 -0800345 if (domain != NULL) {
346 entry->domain = kstrdup(domain, GFP_ATOMIC);
347 if (entry->domain == NULL)
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500348 goto cfg_cipsov4_map_add_failure;
Paul Mooreeda61d32008-02-04 22:29:47 -0800349 }
Paul Mooreeda61d32008-02-04 22:29:47 -0800350
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500351 if (addr == NULL && mask == NULL) {
352 entry->type_def.cipsov4 = doi_def;
353 entry->type = NETLBL_NLTYPE_CIPSOV4;
354 } else if (addr != NULL && mask != NULL) {
355 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
356 if (addrmap == NULL)
357 goto cfg_cipsov4_map_add_failure;
358 INIT_LIST_HEAD(&addrmap->list4);
359 INIT_LIST_HEAD(&addrmap->list6);
360
361 addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC);
362 if (addrinfo == NULL)
363 goto cfg_cipsov4_map_add_failure;
364 addrinfo->type_def.cipsov4 = doi_def;
365 addrinfo->type = NETLBL_NLTYPE_CIPSOV4;
366 addrinfo->list.addr = addr->s_addr & mask->s_addr;
367 addrinfo->list.mask = mask->s_addr;
368 addrinfo->list.valid = 1;
369 ret_val = netlbl_af4list_add(&addrinfo->list, &addrmap->list4);
370 if (ret_val != 0)
371 goto cfg_cipsov4_map_add_failure;
372
373 entry->type_def.addrsel = addrmap;
374 entry->type = NETLBL_NLTYPE_ADDRSELECT;
375 } else {
376 ret_val = -EINVAL;
377 goto cfg_cipsov4_map_add_failure;
Paul Mooreb1edeb12008-10-10 10:16:31 -0400378 }
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500379
Paul Mooreeda61d32008-02-04 22:29:47 -0800380 ret_val = netlbl_domhsh_add(entry, audit_info);
381 if (ret_val != 0)
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500382 goto cfg_cipsov4_map_add_failure;
Paul Mooreeda61d32008-02-04 22:29:47 -0800383
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500384 return 0;
Paul Mooreb1edeb12008-10-10 10:16:31 -0400385
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500386cfg_cipsov4_map_add_failure:
Paul Mooreb1edeb12008-10-10 10:16:31 -0400387 cipso_v4_doi_putdef(doi_def);
Julia Lawall47943232009-07-27 06:15:43 +0000388 kfree(entry->domain);
Paul Mooreeda61d32008-02-04 22:29:47 -0800389 kfree(entry);
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500390 kfree(addrmap);
391 kfree(addrinfo);
392 return ret_val;
Paul Mooreeda61d32008-02-04 22:29:47 -0800393}
394
Paul Mooreeda61d32008-02-04 22:29:47 -0800395/*
Paul Moore02752762006-11-29 13:18:18 -0500396 * Security Attribute Functions
397 */
398
399/**
400 * netlbl_secattr_catmap_walk - Walk a LSM secattr catmap looking for a bit
401 * @catmap: the category bitmap
402 * @offset: the offset to start searching at, in bits
403 *
404 * Description:
405 * This function walks a LSM secattr category bitmap starting at @offset and
406 * returns the spot of the first set bit or -ENOENT if no bits are set.
407 *
408 */
409int netlbl_secattr_catmap_walk(struct netlbl_lsm_secattr_catmap *catmap,
410 u32 offset)
411{
412 struct netlbl_lsm_secattr_catmap *iter = catmap;
413 u32 node_idx;
414 u32 node_bit;
415 NETLBL_CATMAP_MAPTYPE bitmap;
416
417 if (offset > iter->startbit) {
418 while (offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
419 iter = iter->next;
420 if (iter == NULL)
421 return -ENOENT;
422 }
423 node_idx = (offset - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
424 node_bit = offset - iter->startbit -
425 (NETLBL_CATMAP_MAPSIZE * node_idx);
426 } else {
427 node_idx = 0;
428 node_bit = 0;
429 }
430 bitmap = iter->bitmap[node_idx] >> node_bit;
431
432 for (;;) {
433 if (bitmap != 0) {
434 while ((bitmap & NETLBL_CATMAP_BIT) == 0) {
435 bitmap >>= 1;
436 node_bit++;
437 }
438 return iter->startbit +
439 (NETLBL_CATMAP_MAPSIZE * node_idx) + node_bit;
440 }
441 if (++node_idx >= NETLBL_CATMAP_MAPCNT) {
442 if (iter->next != NULL) {
443 iter = iter->next;
444 node_idx = 0;
445 } else
446 return -ENOENT;
447 }
448 bitmap = iter->bitmap[node_idx];
449 node_bit = 0;
450 }
451
452 return -ENOENT;
453}
454
455/**
456 * netlbl_secattr_catmap_walk_rng - Find the end of a string of set bits
457 * @catmap: the category bitmap
458 * @offset: the offset to start searching at, in bits
459 *
460 * Description:
461 * This function walks a LSM secattr category bitmap starting at @offset and
462 * returns the spot of the first cleared bit or -ENOENT if the offset is past
463 * the end of the bitmap.
464 *
465 */
466int netlbl_secattr_catmap_walk_rng(struct netlbl_lsm_secattr_catmap *catmap,
467 u32 offset)
468{
469 struct netlbl_lsm_secattr_catmap *iter = catmap;
470 u32 node_idx;
471 u32 node_bit;
472 NETLBL_CATMAP_MAPTYPE bitmask;
473 NETLBL_CATMAP_MAPTYPE bitmap;
474
475 if (offset > iter->startbit) {
476 while (offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
477 iter = iter->next;
478 if (iter == NULL)
479 return -ENOENT;
480 }
481 node_idx = (offset - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
482 node_bit = offset - iter->startbit -
483 (NETLBL_CATMAP_MAPSIZE * node_idx);
484 } else {
485 node_idx = 0;
486 node_bit = 0;
487 }
488 bitmask = NETLBL_CATMAP_BIT << node_bit;
489
490 for (;;) {
491 bitmap = iter->bitmap[node_idx];
492 while (bitmask != 0 && (bitmap & bitmask) != 0) {
493 bitmask <<= 1;
494 node_bit++;
495 }
496
497 if (bitmask != 0)
498 return iter->startbit +
499 (NETLBL_CATMAP_MAPSIZE * node_idx) +
500 node_bit - 1;
501 else if (++node_idx >= NETLBL_CATMAP_MAPCNT) {
502 if (iter->next == NULL)
503 return iter->startbit + NETLBL_CATMAP_SIZE - 1;
504 iter = iter->next;
505 node_idx = 0;
506 }
507 bitmask = NETLBL_CATMAP_BIT;
508 node_bit = 0;
509 }
510
511 return -ENOENT;
512}
513
514/**
515 * netlbl_secattr_catmap_setbit - Set a bit in a LSM secattr catmap
516 * @catmap: the category bitmap
517 * @bit: the bit to set
518 * @flags: memory allocation flags
519 *
520 * Description:
521 * Set the bit specified by @bit in @catmap. Returns zero on success,
522 * negative values on failure.
523 *
524 */
525int netlbl_secattr_catmap_setbit(struct netlbl_lsm_secattr_catmap *catmap,
526 u32 bit,
527 gfp_t flags)
528{
529 struct netlbl_lsm_secattr_catmap *iter = catmap;
530 u32 node_bit;
531 u32 node_idx;
532
533 while (iter->next != NULL &&
534 bit >= (iter->startbit + NETLBL_CATMAP_SIZE))
535 iter = iter->next;
536 if (bit >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
537 iter->next = netlbl_secattr_catmap_alloc(flags);
538 if (iter->next == NULL)
539 return -ENOMEM;
540 iter = iter->next;
541 iter->startbit = bit & ~(NETLBL_CATMAP_SIZE - 1);
542 }
543
544 /* gcc always rounds to zero when doing integer division */
545 node_idx = (bit - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
546 node_bit = bit - iter->startbit - (NETLBL_CATMAP_MAPSIZE * node_idx);
547 iter->bitmap[node_idx] |= NETLBL_CATMAP_BIT << node_bit;
548
549 return 0;
550}
551
552/**
553 * netlbl_secattr_catmap_setrng - Set a range of bits in a LSM secattr catmap
554 * @catmap: the category bitmap
555 * @start: the starting bit
556 * @end: the last bit in the string
557 * @flags: memory allocation flags
558 *
559 * Description:
560 * Set a range of bits, starting at @start and ending with @end. Returns zero
561 * on success, negative values on failure.
562 *
563 */
564int netlbl_secattr_catmap_setrng(struct netlbl_lsm_secattr_catmap *catmap,
565 u32 start,
566 u32 end,
567 gfp_t flags)
568{
569 int ret_val = 0;
570 struct netlbl_lsm_secattr_catmap *iter = catmap;
571 u32 iter_max_spot;
572 u32 spot;
573
574 /* XXX - This could probably be made a bit faster by combining writes
575 * to the catmap instead of setting a single bit each time, but for
576 * right now skipping to the start of the range in the catmap should
577 * be a nice improvement over calling the individual setbit function
578 * repeatedly from a loop. */
579
580 while (iter->next != NULL &&
581 start >= (iter->startbit + NETLBL_CATMAP_SIZE))
582 iter = iter->next;
583 iter_max_spot = iter->startbit + NETLBL_CATMAP_SIZE;
584
585 for (spot = start; spot <= end && ret_val == 0; spot++) {
586 if (spot >= iter_max_spot && iter->next != NULL) {
587 iter = iter->next;
588 iter_max_spot = iter->startbit + NETLBL_CATMAP_SIZE;
589 }
590 ret_val = netlbl_secattr_catmap_setbit(iter, spot, GFP_ATOMIC);
591 }
592
593 return ret_val;
594}
595
596/*
Paul Moored15c3452006-08-03 16:48:37 -0700597 * LSM Functions
598 */
599
600/**
Paul Moore23bcdc12007-07-18 12:28:45 -0400601 * netlbl_enabled - Determine if the NetLabel subsystem is enabled
602 *
603 * Description:
604 * The LSM can use this function to determine if it should use NetLabel
605 * security attributes in it's enforcement mechanism. Currently, NetLabel is
606 * considered to be enabled when it's configuration contains a valid setup for
607 * at least one labeled protocol (i.e. NetLabel can understand incoming
608 * labeled packets of at least one type); otherwise NetLabel is considered to
609 * be disabled.
610 *
611 */
612int netlbl_enabled(void)
613{
614 /* At some point we probably want to expose this mechanism to the user
615 * as well so that admins can toggle NetLabel regardless of the
616 * configuration */
Paul Moorec783f1c2008-01-29 08:37:52 -0500617 return (atomic_read(&netlabel_mgmt_protocount) > 0);
Paul Moore23bcdc12007-07-18 12:28:45 -0400618}
619
620/**
Paul Moore389fb8002009-03-27 17:10:34 -0400621 * netlbl_sock_setattr - Label a socket using the correct protocol
Paul Mooreba6ff9f2007-06-07 18:37:15 -0700622 * @sk: the socket to label
Paul Moore389fb8002009-03-27 17:10:34 -0400623 * @family: protocol family
Paul Moored15c3452006-08-03 16:48:37 -0700624 * @secattr: the security attributes
625 *
626 * Description:
627 * Attach the correct label to the given socket using the security attributes
Paul Mooreba6ff9f2007-06-07 18:37:15 -0700628 * specified in @secattr. This function requires exclusive access to @sk,
629 * which means it either needs to be in the process of being created or locked.
Paul Moore63c41682008-10-10 10:16:32 -0400630 * Returns zero on success, -EDESTADDRREQ if the domain is configured to use
631 * network address selectors (can't blindly label the socket), and negative
632 * values on all other failures.
Paul Moored15c3452006-08-03 16:48:37 -0700633 *
634 */
Paul Mooreba6ff9f2007-06-07 18:37:15 -0700635int netlbl_sock_setattr(struct sock *sk,
Paul Moore389fb8002009-03-27 17:10:34 -0400636 u16 family,
Paul Mooreba6ff9f2007-06-07 18:37:15 -0700637 const struct netlbl_lsm_secattr *secattr)
Paul Moored15c3452006-08-03 16:48:37 -0700638{
Paul Moore389fb8002009-03-27 17:10:34 -0400639 int ret_val;
Paul Moored15c3452006-08-03 16:48:37 -0700640 struct netlbl_dom_map *dom_entry;
641
642 rcu_read_lock();
643 dom_entry = netlbl_domhsh_getentry(secattr->domain);
Paul Moore389fb8002009-03-27 17:10:34 -0400644 if (dom_entry == NULL) {
645 ret_val = -ENOENT;
Paul Moored15c3452006-08-03 16:48:37 -0700646 goto socket_setattr_return;
Paul Moore389fb8002009-03-27 17:10:34 -0400647 }
648 switch (family) {
649 case AF_INET:
650 switch (dom_entry->type) {
651 case NETLBL_NLTYPE_ADDRSELECT:
652 ret_val = -EDESTADDRREQ;
653 break;
654 case NETLBL_NLTYPE_CIPSOV4:
655 ret_val = cipso_v4_sock_setattr(sk,
656 dom_entry->type_def.cipsov4,
657 secattr);
658 break;
659 case NETLBL_NLTYPE_UNLABELED:
660 ret_val = 0;
661 break;
662 default:
663 ret_val = -ENOENT;
664 }
Paul Moore63c41682008-10-10 10:16:32 -0400665 break;
Paul Moore389fb8002009-03-27 17:10:34 -0400666#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
667 case AF_INET6:
668 /* since we don't support any IPv6 labeling protocols right
669 * now we can optimize everything away until we do */
Paul Moored15c3452006-08-03 16:48:37 -0700670 ret_val = 0;
671 break;
Paul Moore389fb8002009-03-27 17:10:34 -0400672#endif /* IPv6 */
Paul Moored15c3452006-08-03 16:48:37 -0700673 default:
Paul Moore389fb8002009-03-27 17:10:34 -0400674 ret_val = -EPROTONOSUPPORT;
Paul Moored15c3452006-08-03 16:48:37 -0700675 }
676
677socket_setattr_return:
678 rcu_read_unlock();
679 return ret_val;
680}
681
682/**
Paul Moore014ab192008-10-10 10:16:33 -0400683 * netlbl_sock_delattr - Delete all the NetLabel labels on a socket
684 * @sk: the socket
685 *
686 * Description:
687 * Remove all the NetLabel labeling from @sk. The caller is responsible for
688 * ensuring that @sk is locked.
689 *
690 */
691void netlbl_sock_delattr(struct sock *sk)
692{
693 cipso_v4_sock_delattr(sk);
694}
695
696/**
Paul Moore14a72f52006-09-25 15:52:01 -0700697 * netlbl_sock_getattr - Determine the security attributes of a sock
698 * @sk: the sock
699 * @secattr: the security attributes
700 *
701 * Description:
Paul Moore8cc44572008-01-29 08:44:21 -0500702 * Examines the given sock to see if any NetLabel style labeling has been
Paul Moore14a72f52006-09-25 15:52:01 -0700703 * applied to the sock, if so it parses the socket label and returns the
704 * security attributes in @secattr. Returns zero on success, negative values
705 * on failure.
706 *
707 */
Paul Moore389fb8002009-03-27 17:10:34 -0400708int netlbl_sock_getattr(struct sock *sk,
709 struct netlbl_lsm_secattr *secattr)
Paul Moore14a72f52006-09-25 15:52:01 -0700710{
Paul Moore389fb8002009-03-27 17:10:34 -0400711 int ret_val;
712
713 switch (sk->sk_family) {
714 case AF_INET:
715 ret_val = cipso_v4_sock_getattr(sk, secattr);
716 break;
717#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
718 case AF_INET6:
719 ret_val = -ENOMSG;
720 break;
721#endif /* IPv6 */
722 default:
723 ret_val = -EPROTONOSUPPORT;
724 }
725
726 return ret_val;
Paul Moore14a72f52006-09-25 15:52:01 -0700727}
728
729/**
Paul Moore014ab192008-10-10 10:16:33 -0400730 * netlbl_conn_setattr - Label a connected socket using the correct protocol
731 * @sk: the socket to label
732 * @addr: the destination address
733 * @secattr: the security attributes
734 *
735 * Description:
736 * Attach the correct label to the given connected socket using the security
737 * attributes specified in @secattr. The caller is responsible for ensuring
738 * that @sk is locked. Returns zero on success, negative values on failure.
739 *
740 */
741int netlbl_conn_setattr(struct sock *sk,
742 struct sockaddr *addr,
743 const struct netlbl_lsm_secattr *secattr)
744{
745 int ret_val;
746 struct sockaddr_in *addr4;
747 struct netlbl_domaddr4_map *af4_entry;
748
749 rcu_read_lock();
750 switch (addr->sa_family) {
751 case AF_INET:
752 addr4 = (struct sockaddr_in *)addr;
753 af4_entry = netlbl_domhsh_getentry_af4(secattr->domain,
754 addr4->sin_addr.s_addr);
755 if (af4_entry == NULL) {
756 ret_val = -ENOENT;
757 goto conn_setattr_return;
758 }
759 switch (af4_entry->type) {
760 case NETLBL_NLTYPE_CIPSOV4:
761 ret_val = cipso_v4_sock_setattr(sk,
762 af4_entry->type_def.cipsov4,
763 secattr);
764 break;
765 case NETLBL_NLTYPE_UNLABELED:
766 /* just delete the protocols we support for right now
767 * but we could remove other protocols if needed */
768 cipso_v4_sock_delattr(sk);
769 ret_val = 0;
770 break;
771 default:
772 ret_val = -ENOENT;
773 }
774 break;
775#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
776 case AF_INET6:
777 /* since we don't support any IPv6 labeling protocols right
778 * now we can optimize everything away until we do */
779 ret_val = 0;
780 break;
781#endif /* IPv6 */
782 default:
Paul Moore389fb8002009-03-27 17:10:34 -0400783 ret_val = -EPROTONOSUPPORT;
Paul Moore014ab192008-10-10 10:16:33 -0400784 }
785
786conn_setattr_return:
787 rcu_read_unlock();
788 return ret_val;
789}
790
791/**
Paul Moore389fb8002009-03-27 17:10:34 -0400792 * netlbl_req_setattr - Label a request socket using the correct protocol
793 * @req: the request socket to label
794 * @secattr: the security attributes
795 *
796 * Description:
797 * Attach the correct label to the given socket using the security attributes
798 * specified in @secattr. Returns zero on success, negative values on failure.
799 *
800 */
801int netlbl_req_setattr(struct request_sock *req,
802 const struct netlbl_lsm_secattr *secattr)
803{
804 int ret_val;
805 struct netlbl_dom_map *dom_entry;
806 struct netlbl_domaddr4_map *af4_entry;
807 u32 proto_type;
808 struct cipso_v4_doi *proto_cv4;
809
810 rcu_read_lock();
811 dom_entry = netlbl_domhsh_getentry(secattr->domain);
812 if (dom_entry == NULL) {
813 ret_val = -ENOENT;
814 goto req_setattr_return;
815 }
816 switch (req->rsk_ops->family) {
817 case AF_INET:
818 if (dom_entry->type == NETLBL_NLTYPE_ADDRSELECT) {
819 struct inet_request_sock *req_inet = inet_rsk(req);
820 af4_entry = netlbl_domhsh_getentry_af4(secattr->domain,
821 req_inet->rmt_addr);
822 if (af4_entry == NULL) {
823 ret_val = -ENOENT;
824 goto req_setattr_return;
825 }
826 proto_type = af4_entry->type;
827 proto_cv4 = af4_entry->type_def.cipsov4;
828 } else {
829 proto_type = dom_entry->type;
830 proto_cv4 = dom_entry->type_def.cipsov4;
831 }
832 switch (proto_type) {
833 case NETLBL_NLTYPE_CIPSOV4:
834 ret_val = cipso_v4_req_setattr(req, proto_cv4, secattr);
835 break;
836 case NETLBL_NLTYPE_UNLABELED:
837 /* just delete the protocols we support for right now
838 * but we could remove other protocols if needed */
839 cipso_v4_req_delattr(req);
840 ret_val = 0;
841 break;
842 default:
843 ret_val = -ENOENT;
844 }
845 break;
846#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
847 case AF_INET6:
848 /* since we don't support any IPv6 labeling protocols right
849 * now we can optimize everything away until we do */
850 ret_val = 0;
851 break;
852#endif /* IPv6 */
853 default:
854 ret_val = -EPROTONOSUPPORT;
855 }
856
857req_setattr_return:
858 rcu_read_unlock();
859 return ret_val;
860}
861
862/**
Paul Moore07feee82009-03-27 17:10:54 -0400863* netlbl_req_delattr - Delete all the NetLabel labels on a socket
864* @req: the socket
865*
866* Description:
867* Remove all the NetLabel labeling from @req.
868*
869*/
870void netlbl_req_delattr(struct request_sock *req)
871{
872 cipso_v4_req_delattr(req);
873}
874
875/**
Paul Moore948bf852008-10-10 10:16:32 -0400876 * netlbl_skbuff_setattr - Label a packet using the correct protocol
877 * @skb: the packet
878 * @family: protocol family
879 * @secattr: the security attributes
880 *
881 * Description:
882 * Attach the correct label to the given packet using the security attributes
883 * specified in @secattr. Returns zero on success, negative values on failure.
884 *
885 */
886int netlbl_skbuff_setattr(struct sk_buff *skb,
887 u16 family,
888 const struct netlbl_lsm_secattr *secattr)
889{
890 int ret_val;
891 struct iphdr *hdr4;
892 struct netlbl_domaddr4_map *af4_entry;
893
894 rcu_read_lock();
895 switch (family) {
896 case AF_INET:
897 hdr4 = ip_hdr(skb);
898 af4_entry = netlbl_domhsh_getentry_af4(secattr->domain,
899 hdr4->daddr);
900 if (af4_entry == NULL) {
901 ret_val = -ENOENT;
902 goto skbuff_setattr_return;
903 }
904 switch (af4_entry->type) {
905 case NETLBL_NLTYPE_CIPSOV4:
906 ret_val = cipso_v4_skbuff_setattr(skb,
907 af4_entry->type_def.cipsov4,
908 secattr);
909 break;
910 case NETLBL_NLTYPE_UNLABELED:
911 /* just delete the protocols we support for right now
912 * but we could remove other protocols if needed */
913 ret_val = cipso_v4_skbuff_delattr(skb);
914 break;
915 default:
916 ret_val = -ENOENT;
917 }
918 break;
919#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
920 case AF_INET6:
921 /* since we don't support any IPv6 labeling protocols right
922 * now we can optimize everything away until we do */
923 ret_val = 0;
924 break;
925#endif /* IPv6 */
926 default:
Paul Moore389fb8002009-03-27 17:10:34 -0400927 ret_val = -EPROTONOSUPPORT;
Paul Moore948bf852008-10-10 10:16:32 -0400928 }
929
930skbuff_setattr_return:
931 rcu_read_unlock();
932 return ret_val;
933}
934
935/**
Paul Moored15c3452006-08-03 16:48:37 -0700936 * netlbl_skbuff_getattr - Determine the security attributes of a packet
937 * @skb: the packet
Paul Moore75e22912008-01-29 08:38:04 -0500938 * @family: protocol family
Paul Moored15c3452006-08-03 16:48:37 -0700939 * @secattr: the security attributes
940 *
941 * Description:
942 * Examines the given packet to see if a recognized form of packet labeling
943 * is present, if so it parses the packet label and returns the security
944 * attributes in @secattr. Returns zero on success, negative values on
945 * failure.
946 *
947 */
948int netlbl_skbuff_getattr(const struct sk_buff *skb,
Paul Moore75e22912008-01-29 08:38:04 -0500949 u16 family,
Paul Moored15c3452006-08-03 16:48:37 -0700950 struct netlbl_lsm_secattr *secattr)
951{
Paul Moore389fb8002009-03-27 17:10:34 -0400952 switch (family) {
953 case AF_INET:
954 if (CIPSO_V4_OPTEXIST(skb) &&
955 cipso_v4_skbuff_getattr(skb, secattr) == 0)
956 return 0;
957 break;
958#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
959 case AF_INET6:
960 break;
961#endif /* IPv6 */
962 }
Paul Moored15c3452006-08-03 16:48:37 -0700963
Paul Moore8cc44572008-01-29 08:44:21 -0500964 return netlbl_unlabel_getattr(skb, family, secattr);
Paul Moored15c3452006-08-03 16:48:37 -0700965}
966
967/**
968 * netlbl_skbuff_err - Handle a LSM error on a sk_buff
969 * @skb: the packet
970 * @error: the error code
Paul Mooredfaebe92008-10-10 10:16:31 -0400971 * @gateway: true if host is acting as a gateway, false otherwise
Paul Moored15c3452006-08-03 16:48:37 -0700972 *
973 * Description:
974 * Deal with a LSM problem when handling the packet in @skb, typically this is
975 * a permission denied problem (-EACCES). The correct action is determined
976 * according to the packet's labeling protocol.
977 *
978 */
Paul Mooredfaebe92008-10-10 10:16:31 -0400979void netlbl_skbuff_err(struct sk_buff *skb, int error, int gateway)
Paul Moored15c3452006-08-03 16:48:37 -0700980{
981 if (CIPSO_V4_OPTEXIST(skb))
Paul Mooredfaebe92008-10-10 10:16:31 -0400982 cipso_v4_error(skb, error, gateway);
Paul Moored15c3452006-08-03 16:48:37 -0700983}
984
985/**
986 * netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches
987 *
988 * Description:
989 * For all of the NetLabel protocols that support some form of label mapping
990 * cache, invalidate the cache. Returns zero on success, negative values on
991 * error.
992 *
993 */
994void netlbl_cache_invalidate(void)
995{
996 cipso_v4_cache_invalidate();
997}
998
999/**
1000 * netlbl_cache_add - Add an entry to a NetLabel protocol cache
1001 * @skb: the packet
1002 * @secattr: the packet's security attributes
1003 *
1004 * Description:
1005 * Add the LSM security attributes for the given packet to the underlying
1006 * NetLabel protocol's label mapping cache. Returns zero on success, negative
1007 * values on error.
1008 *
1009 */
1010int netlbl_cache_add(const struct sk_buff *skb,
1011 const struct netlbl_lsm_secattr *secattr)
1012{
Paul Moore701a90b2006-11-17 17:38:46 -05001013 if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0)
Paul Moored15c3452006-08-03 16:48:37 -07001014 return -ENOMSG;
1015
1016 if (CIPSO_V4_OPTEXIST(skb))
1017 return cipso_v4_cache_add(skb, secattr);
1018
1019 return -ENOMSG;
1020}
1021
1022/*
Paul Moore6c2e8ac2008-12-31 12:54:11 -05001023 * Protocol Engine Functions
1024 */
1025
1026/**
1027 * netlbl_audit_start - Start an audit message
1028 * @type: audit message type
1029 * @audit_info: NetLabel audit information
1030 *
1031 * Description:
1032 * Start an audit message using the type specified in @type and fill the audit
1033 * message with some fields common to all NetLabel audit messages. This
1034 * function should only be used by protocol engines, not LSMs. Returns a
1035 * pointer to the audit buffer on success, NULL on failure.
1036 *
1037 */
1038struct audit_buffer *netlbl_audit_start(int type,
1039 struct netlbl_audit *audit_info)
1040{
1041 return netlbl_audit_start_common(type, audit_info);
1042}
1043
1044/*
Paul Moored15c3452006-08-03 16:48:37 -07001045 * Setup Functions
1046 */
1047
1048/**
1049 * netlbl_init - Initialize NetLabel
1050 *
1051 * Description:
1052 * Perform the required NetLabel initialization before first use.
1053 *
1054 */
1055static int __init netlbl_init(void)
1056{
1057 int ret_val;
1058
1059 printk(KERN_INFO "NetLabel: Initializing\n");
1060 printk(KERN_INFO "NetLabel: domain hash size = %u\n",
1061 (1 << NETLBL_DOMHSH_BITSIZE));
1062 printk(KERN_INFO "NetLabel: protocols ="
1063 " UNLABELED"
1064 " CIPSOv4"
1065 "\n");
1066
1067 ret_val = netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE);
1068 if (ret_val != 0)
1069 goto init_failure;
1070
Paul Moore8cc44572008-01-29 08:44:21 -05001071 ret_val = netlbl_unlabel_init(NETLBL_UNLHSH_BITSIZE);
1072 if (ret_val != 0)
1073 goto init_failure;
1074
Paul Moored15c3452006-08-03 16:48:37 -07001075 ret_val = netlbl_netlink_init();
1076 if (ret_val != 0)
1077 goto init_failure;
1078
1079 ret_val = netlbl_unlabel_defconf();
1080 if (ret_val != 0)
1081 goto init_failure;
1082 printk(KERN_INFO "NetLabel: unlabeled traffic allowed by default\n");
1083
1084 return 0;
1085
1086init_failure:
1087 panic("NetLabel: failed to initialize properly (%d)\n", ret_val);
1088}
1089
1090subsys_initcall(netlbl_init);