blob: 9c24de10a6579b78e452e47912c56e5d894e58ea [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 *
Paul Moore82c21bf2011-08-01 11:10:33 +00008 * Author: Paul Moore <paul@paul-moore.com>
Paul Moored15c3452006-08-03 16:48:37 -07009 *
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>
Arun Sharma60063492011-07-26 16:09:06 -070042#include <linux/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)
Julia Lawall94a80d62011-08-11 00:06:04 +0000344 goto out_entry;
Paul Mooreeda61d32008-02-04 22:29:47 -0800345 if (domain != NULL) {
346 entry->domain = kstrdup(domain, GFP_ATOMIC);
347 if (entry->domain == NULL)
Julia Lawall94a80d62011-08-11 00:06:04 +0000348 goto out_domain;
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)
Julia Lawall94a80d62011-08-11 00:06:04 +0000357 goto out_addrmap;
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500358 INIT_LIST_HEAD(&addrmap->list4);
359 INIT_LIST_HEAD(&addrmap->list6);
360
361 addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC);
362 if (addrinfo == NULL)
Julia Lawall94a80d62011-08-11 00:06:04 +0000363 goto out_addrinfo;
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500364 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;
Julia Lawall94a80d62011-08-11 00:06:04 +0000377 goto out_addrmap;
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 Moore6c2e8ac2008-12-31 12:54:11 -0500387 kfree(addrinfo);
Julia Lawall94a80d62011-08-11 00:06:04 +0000388out_addrinfo:
389 kfree(addrmap);
390out_addrmap:
391 kfree(entry->domain);
392out_domain:
393 kfree(entry);
394out_entry:
395 cipso_v4_doi_putdef(doi_def);
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500396 return ret_val;
Paul Mooreeda61d32008-02-04 22:29:47 -0800397}
398
Paul Mooreeda61d32008-02-04 22:29:47 -0800399/*
Paul Moore02752762006-11-29 13:18:18 -0500400 * Security Attribute Functions
401 */
402
403/**
404 * netlbl_secattr_catmap_walk - Walk a LSM secattr catmap looking for a bit
405 * @catmap: the category bitmap
406 * @offset: the offset to start searching at, in bits
407 *
408 * Description:
409 * This function walks a LSM secattr category bitmap starting at @offset and
410 * returns the spot of the first set bit or -ENOENT if no bits are set.
411 *
412 */
413int netlbl_secattr_catmap_walk(struct netlbl_lsm_secattr_catmap *catmap,
414 u32 offset)
415{
416 struct netlbl_lsm_secattr_catmap *iter = catmap;
417 u32 node_idx;
418 u32 node_bit;
419 NETLBL_CATMAP_MAPTYPE bitmap;
420
421 if (offset > iter->startbit) {
422 while (offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
423 iter = iter->next;
424 if (iter == NULL)
425 return -ENOENT;
426 }
427 node_idx = (offset - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
428 node_bit = offset - iter->startbit -
429 (NETLBL_CATMAP_MAPSIZE * node_idx);
430 } else {
431 node_idx = 0;
432 node_bit = 0;
433 }
434 bitmap = iter->bitmap[node_idx] >> node_bit;
435
436 for (;;) {
437 if (bitmap != 0) {
438 while ((bitmap & NETLBL_CATMAP_BIT) == 0) {
439 bitmap >>= 1;
440 node_bit++;
441 }
442 return iter->startbit +
443 (NETLBL_CATMAP_MAPSIZE * node_idx) + node_bit;
444 }
445 if (++node_idx >= NETLBL_CATMAP_MAPCNT) {
446 if (iter->next != NULL) {
447 iter = iter->next;
448 node_idx = 0;
449 } else
450 return -ENOENT;
451 }
452 bitmap = iter->bitmap[node_idx];
453 node_bit = 0;
454 }
455
456 return -ENOENT;
457}
458
459/**
460 * netlbl_secattr_catmap_walk_rng - Find the end of a string of set bits
461 * @catmap: the category bitmap
462 * @offset: the offset to start searching at, in bits
463 *
464 * Description:
465 * This function walks a LSM secattr category bitmap starting at @offset and
466 * returns the spot of the first cleared bit or -ENOENT if the offset is past
467 * the end of the bitmap.
468 *
469 */
470int netlbl_secattr_catmap_walk_rng(struct netlbl_lsm_secattr_catmap *catmap,
471 u32 offset)
472{
473 struct netlbl_lsm_secattr_catmap *iter = catmap;
474 u32 node_idx;
475 u32 node_bit;
476 NETLBL_CATMAP_MAPTYPE bitmask;
477 NETLBL_CATMAP_MAPTYPE bitmap;
478
479 if (offset > iter->startbit) {
480 while (offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
481 iter = iter->next;
482 if (iter == NULL)
483 return -ENOENT;
484 }
485 node_idx = (offset - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
486 node_bit = offset - iter->startbit -
487 (NETLBL_CATMAP_MAPSIZE * node_idx);
488 } else {
489 node_idx = 0;
490 node_bit = 0;
491 }
492 bitmask = NETLBL_CATMAP_BIT << node_bit;
493
494 for (;;) {
495 bitmap = iter->bitmap[node_idx];
496 while (bitmask != 0 && (bitmap & bitmask) != 0) {
497 bitmask <<= 1;
498 node_bit++;
499 }
500
501 if (bitmask != 0)
502 return iter->startbit +
503 (NETLBL_CATMAP_MAPSIZE * node_idx) +
504 node_bit - 1;
505 else if (++node_idx >= NETLBL_CATMAP_MAPCNT) {
506 if (iter->next == NULL)
507 return iter->startbit + NETLBL_CATMAP_SIZE - 1;
508 iter = iter->next;
509 node_idx = 0;
510 }
511 bitmask = NETLBL_CATMAP_BIT;
512 node_bit = 0;
513 }
514
515 return -ENOENT;
516}
517
518/**
519 * netlbl_secattr_catmap_setbit - Set a bit in a LSM secattr catmap
520 * @catmap: the category bitmap
521 * @bit: the bit to set
522 * @flags: memory allocation flags
523 *
524 * Description:
525 * Set the bit specified by @bit in @catmap. Returns zero on success,
526 * negative values on failure.
527 *
528 */
529int netlbl_secattr_catmap_setbit(struct netlbl_lsm_secattr_catmap *catmap,
530 u32 bit,
531 gfp_t flags)
532{
533 struct netlbl_lsm_secattr_catmap *iter = catmap;
534 u32 node_bit;
535 u32 node_idx;
536
537 while (iter->next != NULL &&
538 bit >= (iter->startbit + NETLBL_CATMAP_SIZE))
539 iter = iter->next;
540 if (bit >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
541 iter->next = netlbl_secattr_catmap_alloc(flags);
542 if (iter->next == NULL)
543 return -ENOMEM;
544 iter = iter->next;
545 iter->startbit = bit & ~(NETLBL_CATMAP_SIZE - 1);
546 }
547
548 /* gcc always rounds to zero when doing integer division */
549 node_idx = (bit - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
550 node_bit = bit - iter->startbit - (NETLBL_CATMAP_MAPSIZE * node_idx);
551 iter->bitmap[node_idx] |= NETLBL_CATMAP_BIT << node_bit;
552
553 return 0;
554}
555
556/**
557 * netlbl_secattr_catmap_setrng - Set a range of bits in a LSM secattr catmap
558 * @catmap: the category bitmap
559 * @start: the starting bit
560 * @end: the last bit in the string
561 * @flags: memory allocation flags
562 *
563 * Description:
564 * Set a range of bits, starting at @start and ending with @end. Returns zero
565 * on success, negative values on failure.
566 *
567 */
568int netlbl_secattr_catmap_setrng(struct netlbl_lsm_secattr_catmap *catmap,
569 u32 start,
570 u32 end,
571 gfp_t flags)
572{
573 int ret_val = 0;
574 struct netlbl_lsm_secattr_catmap *iter = catmap;
575 u32 iter_max_spot;
576 u32 spot;
577
578 /* XXX - This could probably be made a bit faster by combining writes
579 * to the catmap instead of setting a single bit each time, but for
580 * right now skipping to the start of the range in the catmap should
581 * be a nice improvement over calling the individual setbit function
582 * repeatedly from a loop. */
583
584 while (iter->next != NULL &&
585 start >= (iter->startbit + NETLBL_CATMAP_SIZE))
586 iter = iter->next;
587 iter_max_spot = iter->startbit + NETLBL_CATMAP_SIZE;
588
589 for (spot = start; spot <= end && ret_val == 0; spot++) {
590 if (spot >= iter_max_spot && iter->next != NULL) {
591 iter = iter->next;
592 iter_max_spot = iter->startbit + NETLBL_CATMAP_SIZE;
593 }
594 ret_val = netlbl_secattr_catmap_setbit(iter, spot, GFP_ATOMIC);
595 }
596
597 return ret_val;
598}
599
600/*
Paul Moored15c3452006-08-03 16:48:37 -0700601 * LSM Functions
602 */
603
604/**
Paul Moore23bcdc12007-07-18 12:28:45 -0400605 * netlbl_enabled - Determine if the NetLabel subsystem is enabled
606 *
607 * Description:
608 * The LSM can use this function to determine if it should use NetLabel
609 * security attributes in it's enforcement mechanism. Currently, NetLabel is
610 * considered to be enabled when it's configuration contains a valid setup for
611 * at least one labeled protocol (i.e. NetLabel can understand incoming
612 * labeled packets of at least one type); otherwise NetLabel is considered to
613 * be disabled.
614 *
615 */
616int netlbl_enabled(void)
617{
618 /* At some point we probably want to expose this mechanism to the user
619 * as well so that admins can toggle NetLabel regardless of the
620 * configuration */
Paul Moorec783f1c2008-01-29 08:37:52 -0500621 return (atomic_read(&netlabel_mgmt_protocount) > 0);
Paul Moore23bcdc12007-07-18 12:28:45 -0400622}
623
624/**
Paul Moore389fb802009-03-27 17:10:34 -0400625 * netlbl_sock_setattr - Label a socket using the correct protocol
Paul Mooreba6ff9f2007-06-07 18:37:15 -0700626 * @sk: the socket to label
Paul Moore389fb802009-03-27 17:10:34 -0400627 * @family: protocol family
Paul Moored15c3452006-08-03 16:48:37 -0700628 * @secattr: the security attributes
629 *
630 * Description:
631 * Attach the correct label to the given socket using the security attributes
Paul Mooreba6ff9f2007-06-07 18:37:15 -0700632 * specified in @secattr. This function requires exclusive access to @sk,
633 * which means it either needs to be in the process of being created or locked.
Paul Moore63c41682008-10-10 10:16:32 -0400634 * Returns zero on success, -EDESTADDRREQ if the domain is configured to use
635 * network address selectors (can't blindly label the socket), and negative
636 * values on all other failures.
Paul Moored15c3452006-08-03 16:48:37 -0700637 *
638 */
Paul Mooreba6ff9f2007-06-07 18:37:15 -0700639int netlbl_sock_setattr(struct sock *sk,
Paul Moore389fb802009-03-27 17:10:34 -0400640 u16 family,
Paul Mooreba6ff9f2007-06-07 18:37:15 -0700641 const struct netlbl_lsm_secattr *secattr)
Paul Moored15c3452006-08-03 16:48:37 -0700642{
Paul Moore389fb802009-03-27 17:10:34 -0400643 int ret_val;
Paul Moored15c3452006-08-03 16:48:37 -0700644 struct netlbl_dom_map *dom_entry;
645
646 rcu_read_lock();
647 dom_entry = netlbl_domhsh_getentry(secattr->domain);
Paul Moore389fb802009-03-27 17:10:34 -0400648 if (dom_entry == NULL) {
649 ret_val = -ENOENT;
Paul Moored15c3452006-08-03 16:48:37 -0700650 goto socket_setattr_return;
Paul Moore389fb802009-03-27 17:10:34 -0400651 }
652 switch (family) {
653 case AF_INET:
654 switch (dom_entry->type) {
655 case NETLBL_NLTYPE_ADDRSELECT:
656 ret_val = -EDESTADDRREQ;
657 break;
658 case NETLBL_NLTYPE_CIPSOV4:
659 ret_val = cipso_v4_sock_setattr(sk,
660 dom_entry->type_def.cipsov4,
661 secattr);
662 break;
663 case NETLBL_NLTYPE_UNLABELED:
664 ret_val = 0;
665 break;
666 default:
667 ret_val = -ENOENT;
668 }
Paul Moore63c41682008-10-10 10:16:32 -0400669 break;
Paul Moore389fb802009-03-27 17:10:34 -0400670#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
671 case AF_INET6:
672 /* since we don't support any IPv6 labeling protocols right
673 * now we can optimize everything away until we do */
Paul Moored15c3452006-08-03 16:48:37 -0700674 ret_val = 0;
675 break;
Paul Moore389fb802009-03-27 17:10:34 -0400676#endif /* IPv6 */
Paul Moored15c3452006-08-03 16:48:37 -0700677 default:
Paul Moore389fb802009-03-27 17:10:34 -0400678 ret_val = -EPROTONOSUPPORT;
Paul Moored15c3452006-08-03 16:48:37 -0700679 }
680
681socket_setattr_return:
682 rcu_read_unlock();
683 return ret_val;
684}
685
686/**
Paul Moore014ab192008-10-10 10:16:33 -0400687 * netlbl_sock_delattr - Delete all the NetLabel labels on a socket
688 * @sk: the socket
689 *
690 * Description:
691 * Remove all the NetLabel labeling from @sk. The caller is responsible for
692 * ensuring that @sk is locked.
693 *
694 */
695void netlbl_sock_delattr(struct sock *sk)
696{
697 cipso_v4_sock_delattr(sk);
698}
699
700/**
Paul Moore14a72f52006-09-25 15:52:01 -0700701 * netlbl_sock_getattr - Determine the security attributes of a sock
702 * @sk: the sock
703 * @secattr: the security attributes
704 *
705 * Description:
Paul Moore8cc44572008-01-29 08:44:21 -0500706 * Examines the given sock to see if any NetLabel style labeling has been
Paul Moore14a72f52006-09-25 15:52:01 -0700707 * applied to the sock, if so it parses the socket label and returns the
708 * security attributes in @secattr. Returns zero on success, negative values
709 * on failure.
710 *
711 */
Paul Moore389fb802009-03-27 17:10:34 -0400712int netlbl_sock_getattr(struct sock *sk,
713 struct netlbl_lsm_secattr *secattr)
Paul Moore14a72f52006-09-25 15:52:01 -0700714{
Paul Moore389fb802009-03-27 17:10:34 -0400715 int ret_val;
716
717 switch (sk->sk_family) {
718 case AF_INET:
719 ret_val = cipso_v4_sock_getattr(sk, secattr);
720 break;
721#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
722 case AF_INET6:
723 ret_val = -ENOMSG;
724 break;
725#endif /* IPv6 */
726 default:
727 ret_val = -EPROTONOSUPPORT;
728 }
729
730 return ret_val;
Paul Moore14a72f52006-09-25 15:52:01 -0700731}
732
733/**
Paul Moore014ab192008-10-10 10:16:33 -0400734 * netlbl_conn_setattr - Label a connected socket using the correct protocol
735 * @sk: the socket to label
736 * @addr: the destination address
737 * @secattr: the security attributes
738 *
739 * Description:
740 * Attach the correct label to the given connected socket using the security
741 * attributes specified in @secattr. The caller is responsible for ensuring
742 * that @sk is locked. Returns zero on success, negative values on failure.
743 *
744 */
745int netlbl_conn_setattr(struct sock *sk,
746 struct sockaddr *addr,
747 const struct netlbl_lsm_secattr *secattr)
748{
749 int ret_val;
750 struct sockaddr_in *addr4;
751 struct netlbl_domaddr4_map *af4_entry;
752
753 rcu_read_lock();
754 switch (addr->sa_family) {
755 case AF_INET:
756 addr4 = (struct sockaddr_in *)addr;
757 af4_entry = netlbl_domhsh_getentry_af4(secattr->domain,
758 addr4->sin_addr.s_addr);
759 if (af4_entry == NULL) {
760 ret_val = -ENOENT;
761 goto conn_setattr_return;
762 }
763 switch (af4_entry->type) {
764 case NETLBL_NLTYPE_CIPSOV4:
765 ret_val = cipso_v4_sock_setattr(sk,
766 af4_entry->type_def.cipsov4,
767 secattr);
768 break;
769 case NETLBL_NLTYPE_UNLABELED:
770 /* just delete the protocols we support for right now
771 * but we could remove other protocols if needed */
772 cipso_v4_sock_delattr(sk);
773 ret_val = 0;
774 break;
775 default:
776 ret_val = -ENOENT;
777 }
778 break;
779#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
780 case AF_INET6:
781 /* since we don't support any IPv6 labeling protocols right
782 * now we can optimize everything away until we do */
783 ret_val = 0;
784 break;
785#endif /* IPv6 */
786 default:
Paul Moore389fb802009-03-27 17:10:34 -0400787 ret_val = -EPROTONOSUPPORT;
Paul Moore014ab192008-10-10 10:16:33 -0400788 }
789
790conn_setattr_return:
791 rcu_read_unlock();
792 return ret_val;
793}
794
795/**
Paul Moore389fb802009-03-27 17:10:34 -0400796 * netlbl_req_setattr - Label a request socket using the correct protocol
797 * @req: the request socket to label
798 * @secattr: the security attributes
799 *
800 * Description:
801 * Attach the correct label to the given socket using the security attributes
802 * specified in @secattr. Returns zero on success, negative values on failure.
803 *
804 */
805int netlbl_req_setattr(struct request_sock *req,
806 const struct netlbl_lsm_secattr *secattr)
807{
808 int ret_val;
809 struct netlbl_dom_map *dom_entry;
810 struct netlbl_domaddr4_map *af4_entry;
811 u32 proto_type;
812 struct cipso_v4_doi *proto_cv4;
813
814 rcu_read_lock();
815 dom_entry = netlbl_domhsh_getentry(secattr->domain);
816 if (dom_entry == NULL) {
817 ret_val = -ENOENT;
818 goto req_setattr_return;
819 }
820 switch (req->rsk_ops->family) {
821 case AF_INET:
822 if (dom_entry->type == NETLBL_NLTYPE_ADDRSELECT) {
823 struct inet_request_sock *req_inet = inet_rsk(req);
824 af4_entry = netlbl_domhsh_getentry_af4(secattr->domain,
825 req_inet->rmt_addr);
826 if (af4_entry == NULL) {
827 ret_val = -ENOENT;
828 goto req_setattr_return;
829 }
830 proto_type = af4_entry->type;
831 proto_cv4 = af4_entry->type_def.cipsov4;
832 } else {
833 proto_type = dom_entry->type;
834 proto_cv4 = dom_entry->type_def.cipsov4;
835 }
836 switch (proto_type) {
837 case NETLBL_NLTYPE_CIPSOV4:
838 ret_val = cipso_v4_req_setattr(req, proto_cv4, secattr);
839 break;
840 case NETLBL_NLTYPE_UNLABELED:
841 /* just delete the protocols we support for right now
842 * but we could remove other protocols if needed */
843 cipso_v4_req_delattr(req);
844 ret_val = 0;
845 break;
846 default:
847 ret_val = -ENOENT;
848 }
849 break;
850#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
851 case AF_INET6:
852 /* since we don't support any IPv6 labeling protocols right
853 * now we can optimize everything away until we do */
854 ret_val = 0;
855 break;
856#endif /* IPv6 */
857 default:
858 ret_val = -EPROTONOSUPPORT;
859 }
860
861req_setattr_return:
862 rcu_read_unlock();
863 return ret_val;
864}
865
866/**
Paul Moore07feee82009-03-27 17:10:54 -0400867* netlbl_req_delattr - Delete all the NetLabel labels on a socket
868* @req: the socket
869*
870* Description:
871* Remove all the NetLabel labeling from @req.
872*
873*/
874void netlbl_req_delattr(struct request_sock *req)
875{
876 cipso_v4_req_delattr(req);
877}
878
879/**
Paul Moore948bf852008-10-10 10:16:32 -0400880 * netlbl_skbuff_setattr - Label a packet using the correct protocol
881 * @skb: the packet
882 * @family: protocol family
883 * @secattr: the security attributes
884 *
885 * Description:
886 * Attach the correct label to the given packet using the security attributes
887 * specified in @secattr. Returns zero on success, negative values on failure.
888 *
889 */
890int netlbl_skbuff_setattr(struct sk_buff *skb,
891 u16 family,
892 const struct netlbl_lsm_secattr *secattr)
893{
894 int ret_val;
895 struct iphdr *hdr4;
896 struct netlbl_domaddr4_map *af4_entry;
897
898 rcu_read_lock();
899 switch (family) {
900 case AF_INET:
901 hdr4 = ip_hdr(skb);
902 af4_entry = netlbl_domhsh_getentry_af4(secattr->domain,
903 hdr4->daddr);
904 if (af4_entry == NULL) {
905 ret_val = -ENOENT;
906 goto skbuff_setattr_return;
907 }
908 switch (af4_entry->type) {
909 case NETLBL_NLTYPE_CIPSOV4:
910 ret_val = cipso_v4_skbuff_setattr(skb,
911 af4_entry->type_def.cipsov4,
912 secattr);
913 break;
914 case NETLBL_NLTYPE_UNLABELED:
915 /* just delete the protocols we support for right now
916 * but we could remove other protocols if needed */
917 ret_val = cipso_v4_skbuff_delattr(skb);
918 break;
919 default:
920 ret_val = -ENOENT;
921 }
922 break;
923#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
924 case AF_INET6:
925 /* since we don't support any IPv6 labeling protocols right
926 * now we can optimize everything away until we do */
927 ret_val = 0;
928 break;
929#endif /* IPv6 */
930 default:
Paul Moore389fb802009-03-27 17:10:34 -0400931 ret_val = -EPROTONOSUPPORT;
Paul Moore948bf852008-10-10 10:16:32 -0400932 }
933
934skbuff_setattr_return:
935 rcu_read_unlock();
936 return ret_val;
937}
938
939/**
Paul Moored15c3452006-08-03 16:48:37 -0700940 * netlbl_skbuff_getattr - Determine the security attributes of a packet
941 * @skb: the packet
Paul Moore75e22912008-01-29 08:38:04 -0500942 * @family: protocol family
Paul Moored15c3452006-08-03 16:48:37 -0700943 * @secattr: the security attributes
944 *
945 * Description:
946 * Examines the given packet to see if a recognized form of packet labeling
947 * is present, if so it parses the packet label and returns the security
948 * attributes in @secattr. Returns zero on success, negative values on
949 * failure.
950 *
951 */
952int netlbl_skbuff_getattr(const struct sk_buff *skb,
Paul Moore75e22912008-01-29 08:38:04 -0500953 u16 family,
Paul Moored15c3452006-08-03 16:48:37 -0700954 struct netlbl_lsm_secattr *secattr)
955{
Paul Moore389fb802009-03-27 17:10:34 -0400956 switch (family) {
957 case AF_INET:
958 if (CIPSO_V4_OPTEXIST(skb) &&
959 cipso_v4_skbuff_getattr(skb, secattr) == 0)
960 return 0;
961 break;
962#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
963 case AF_INET6:
964 break;
965#endif /* IPv6 */
966 }
Paul Moored15c3452006-08-03 16:48:37 -0700967
Paul Moore8cc44572008-01-29 08:44:21 -0500968 return netlbl_unlabel_getattr(skb, family, secattr);
Paul Moored15c3452006-08-03 16:48:37 -0700969}
970
971/**
972 * netlbl_skbuff_err - Handle a LSM error on a sk_buff
973 * @skb: the packet
974 * @error: the error code
Paul Mooredfaebe92008-10-10 10:16:31 -0400975 * @gateway: true if host is acting as a gateway, false otherwise
Paul Moored15c3452006-08-03 16:48:37 -0700976 *
977 * Description:
978 * Deal with a LSM problem when handling the packet in @skb, typically this is
979 * a permission denied problem (-EACCES). The correct action is determined
980 * according to the packet's labeling protocol.
981 *
982 */
Paul Mooredfaebe92008-10-10 10:16:31 -0400983void netlbl_skbuff_err(struct sk_buff *skb, int error, int gateway)
Paul Moored15c3452006-08-03 16:48:37 -0700984{
985 if (CIPSO_V4_OPTEXIST(skb))
Paul Mooredfaebe92008-10-10 10:16:31 -0400986 cipso_v4_error(skb, error, gateway);
Paul Moored15c3452006-08-03 16:48:37 -0700987}
988
989/**
990 * netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches
991 *
992 * Description:
993 * For all of the NetLabel protocols that support some form of label mapping
994 * cache, invalidate the cache. Returns zero on success, negative values on
995 * error.
996 *
997 */
998void netlbl_cache_invalidate(void)
999{
1000 cipso_v4_cache_invalidate();
1001}
1002
1003/**
1004 * netlbl_cache_add - Add an entry to a NetLabel protocol cache
1005 * @skb: the packet
1006 * @secattr: the packet's security attributes
1007 *
1008 * Description:
1009 * Add the LSM security attributes for the given packet to the underlying
1010 * NetLabel protocol's label mapping cache. Returns zero on success, negative
1011 * values on error.
1012 *
1013 */
1014int netlbl_cache_add(const struct sk_buff *skb,
1015 const struct netlbl_lsm_secattr *secattr)
1016{
Paul Moore701a90b2006-11-17 17:38:46 -05001017 if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0)
Paul Moored15c3452006-08-03 16:48:37 -07001018 return -ENOMSG;
1019
1020 if (CIPSO_V4_OPTEXIST(skb))
1021 return cipso_v4_cache_add(skb, secattr);
1022
1023 return -ENOMSG;
1024}
1025
1026/*
Paul Moore6c2e8ac2008-12-31 12:54:11 -05001027 * Protocol Engine Functions
1028 */
1029
1030/**
1031 * netlbl_audit_start - Start an audit message
1032 * @type: audit message type
1033 * @audit_info: NetLabel audit information
1034 *
1035 * Description:
1036 * Start an audit message using the type specified in @type and fill the audit
1037 * message with some fields common to all NetLabel audit messages. This
1038 * function should only be used by protocol engines, not LSMs. Returns a
1039 * pointer to the audit buffer on success, NULL on failure.
1040 *
1041 */
1042struct audit_buffer *netlbl_audit_start(int type,
1043 struct netlbl_audit *audit_info)
1044{
1045 return netlbl_audit_start_common(type, audit_info);
1046}
1047
1048/*
Paul Moored15c3452006-08-03 16:48:37 -07001049 * Setup Functions
1050 */
1051
1052/**
1053 * netlbl_init - Initialize NetLabel
1054 *
1055 * Description:
1056 * Perform the required NetLabel initialization before first use.
1057 *
1058 */
1059static int __init netlbl_init(void)
1060{
1061 int ret_val;
1062
1063 printk(KERN_INFO "NetLabel: Initializing\n");
1064 printk(KERN_INFO "NetLabel: domain hash size = %u\n",
1065 (1 << NETLBL_DOMHSH_BITSIZE));
1066 printk(KERN_INFO "NetLabel: protocols ="
1067 " UNLABELED"
1068 " CIPSOv4"
1069 "\n");
1070
1071 ret_val = netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE);
1072 if (ret_val != 0)
1073 goto init_failure;
1074
Paul Moore8cc44572008-01-29 08:44:21 -05001075 ret_val = netlbl_unlabel_init(NETLBL_UNLHSH_BITSIZE);
1076 if (ret_val != 0)
1077 goto init_failure;
1078
Paul Moored15c3452006-08-03 16:48:37 -07001079 ret_val = netlbl_netlink_init();
1080 if (ret_val != 0)
1081 goto init_failure;
1082
1083 ret_val = netlbl_unlabel_defconf();
1084 if (ret_val != 0)
1085 goto init_failure;
1086 printk(KERN_INFO "NetLabel: unlabeled traffic allowed by default\n");
1087
1088 return 0;
1089
1090init_failure:
1091 panic("NetLabel: failed to initialize properly (%d)\n", ret_val);
1092}
1093
1094subsys_initcall(netlbl_init);