blob: b0e582f2d37aa5a9bf52c8efc86384fe0439472b [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>
Paul Mooreeda61d32008-02-04 22:29:47 -080033#include <linux/audit.h>
Paul Moore6c2e8ac2008-12-31 12:54:11 -050034#include <linux/in.h>
35#include <linux/in6.h>
Paul Moored15c3452006-08-03 16:48:37 -070036#include <net/ip.h>
Paul Moore6c2e8ac2008-12-31 12:54:11 -050037#include <net/ipv6.h>
Paul Moored15c3452006-08-03 16:48:37 -070038#include <net/netlabel.h>
39#include <net/cipso_ipv4.h>
40#include <asm/bug.h>
Paul Moorec783f1c2008-01-29 08:37:52 -050041#include <asm/atomic.h>
Paul Moored15c3452006-08-03 16:48:37 -070042
43#include "netlabel_domainhash.h"
44#include "netlabel_unlabeled.h"
Paul Mooreeda61d32008-02-04 22:29:47 -080045#include "netlabel_cipso_v4.h"
Paul Moored15c3452006-08-03 16:48:37 -070046#include "netlabel_user.h"
Paul Moore23bcdc12007-07-18 12:28:45 -040047#include "netlabel_mgmt.h"
Paul Moore6c2e8ac2008-12-31 12:54:11 -050048#include "netlabel_addrlist.h"
Paul Moored15c3452006-08-03 16:48:37 -070049
50/*
Paul Mooreeda61d32008-02-04 22:29:47 -080051 * Configuration Functions
52 */
53
54/**
55 * netlbl_cfg_map_del - Remove a NetLabel/LSM domain mapping
56 * @domain: the domain mapping to remove
Paul Moore6c2e8ac2008-12-31 12:54:11 -050057 * @family: address family
58 * @addr: IP address
59 * @mask: IP address mask
Paul Mooreeda61d32008-02-04 22:29:47 -080060 * @audit_info: NetLabel audit information
61 *
62 * Description:
63 * Removes a NetLabel/LSM domain mapping. A @domain value of NULL causes the
64 * default domain mapping to be removed. Returns zero on success, negative
65 * values on failure.
66 *
67 */
Paul Moore6c2e8ac2008-12-31 12:54:11 -050068int netlbl_cfg_map_del(const char *domain,
69 u16 family,
70 const void *addr,
71 const void *mask,
72 struct netlbl_audit *audit_info)
Paul Mooreeda61d32008-02-04 22:29:47 -080073{
Paul Moore6c2e8ac2008-12-31 12:54:11 -050074 if (addr == NULL && mask == NULL) {
75 return netlbl_domhsh_remove(domain, audit_info);
76 } else if (addr != NULL && mask != NULL) {
77 switch (family) {
78 case AF_INET:
79 return netlbl_domhsh_remove_af4(domain, addr, mask,
80 audit_info);
81 default:
82 return -EPFNOSUPPORT;
83 }
84 } else
85 return -EINVAL;
Paul Mooreeda61d32008-02-04 22:29:47 -080086}
87
88/**
Paul Moore6c2e8ac2008-12-31 12:54:11 -050089 * netlbl_cfg_unlbl_map_add - Add a new unlabeled mapping
Paul Mooreeda61d32008-02-04 22:29:47 -080090 * @domain: the domain mapping to add
Paul Moore6c2e8ac2008-12-31 12:54:11 -050091 * @family: address family
92 * @addr: IP address
93 * @mask: IP address mask
Paul Mooreeda61d32008-02-04 22:29:47 -080094 * @audit_info: NetLabel audit information
95 *
96 * Description:
97 * Adds a new unlabeled NetLabel/LSM domain mapping. A @domain value of NULL
98 * causes a new default domain mapping to be added. Returns zero on success,
99 * negative values on failure.
100 *
101 */
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500102int netlbl_cfg_unlbl_map_add(const char *domain,
103 u16 family,
104 const void *addr,
105 const void *mask,
Paul Mooreeda61d32008-02-04 22:29:47 -0800106 struct netlbl_audit *audit_info)
107{
108 int ret_val = -ENOMEM;
109 struct netlbl_dom_map *entry;
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500110 struct netlbl_domaddr_map *addrmap = NULL;
111 struct netlbl_domaddr4_map *map4 = NULL;
112 struct netlbl_domaddr6_map *map6 = NULL;
113 const struct in_addr *addr4, *mask4;
114 const struct in6_addr *addr6, *mask6;
Paul Mooreeda61d32008-02-04 22:29:47 -0800115
116 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
117 if (entry == NULL)
Paul Moore948a7242008-10-10 10:16:30 -0400118 return -ENOMEM;
Paul Mooreeda61d32008-02-04 22:29:47 -0800119 if (domain != NULL) {
120 entry->domain = kstrdup(domain, GFP_ATOMIC);
121 if (entry->domain == NULL)
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500122 goto cfg_unlbl_map_add_failure;
Paul Mooreeda61d32008-02-04 22:29:47 -0800123 }
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500124
125 if (addr == NULL && mask == NULL)
126 entry->type = NETLBL_NLTYPE_UNLABELED;
127 else if (addr != NULL && mask != NULL) {
128 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
129 if (addrmap == NULL)
130 goto cfg_unlbl_map_add_failure;
131 INIT_LIST_HEAD(&addrmap->list4);
132 INIT_LIST_HEAD(&addrmap->list6);
133
134 switch (family) {
135 case AF_INET:
136 addr4 = addr;
137 mask4 = mask;
138 map4 = kzalloc(sizeof(*map4), GFP_ATOMIC);
139 if (map4 == NULL)
140 goto cfg_unlbl_map_add_failure;
141 map4->type = NETLBL_NLTYPE_UNLABELED;
142 map4->list.addr = addr4->s_addr & mask4->s_addr;
143 map4->list.mask = mask4->s_addr;
144 map4->list.valid = 1;
145 ret_val = netlbl_af4list_add(&map4->list,
146 &addrmap->list4);
147 if (ret_val != 0)
148 goto cfg_unlbl_map_add_failure;
149 break;
150 case AF_INET6:
151 addr6 = addr;
152 mask6 = mask;
153 map6 = kzalloc(sizeof(*map6), GFP_ATOMIC);
154 if (map4 == NULL)
155 goto cfg_unlbl_map_add_failure;
156 map6->type = NETLBL_NLTYPE_UNLABELED;
157 ipv6_addr_copy(&map6->list.addr, addr6);
158 map6->list.addr.s6_addr32[0] &= mask6->s6_addr32[0];
159 map6->list.addr.s6_addr32[1] &= mask6->s6_addr32[1];
160 map6->list.addr.s6_addr32[2] &= mask6->s6_addr32[2];
161 map6->list.addr.s6_addr32[3] &= mask6->s6_addr32[3];
162 ipv6_addr_copy(&map6->list.mask, mask6);
163 map6->list.valid = 1;
164 ret_val = netlbl_af4list_add(&map4->list,
165 &addrmap->list4);
166 if (ret_val != 0)
167 goto cfg_unlbl_map_add_failure;
168 break;
169 default:
170 goto cfg_unlbl_map_add_failure;
171 break;
172 }
173
174 entry->type_def.addrsel = addrmap;
175 entry->type = NETLBL_NLTYPE_ADDRSELECT;
176 } else {
177 ret_val = -EINVAL;
178 goto cfg_unlbl_map_add_failure;
179 }
Paul Mooreeda61d32008-02-04 22:29:47 -0800180
181 ret_val = netlbl_domhsh_add(entry, audit_info);
182 if (ret_val != 0)
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500183 goto cfg_unlbl_map_add_failure;
Paul Mooreeda61d32008-02-04 22:29:47 -0800184
185 return 0;
186
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500187cfg_unlbl_map_add_failure:
Paul Mooreeda61d32008-02-04 22:29:47 -0800188 if (entry != NULL)
189 kfree(entry->domain);
190 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);
Paul Mooreeda61d32008-02-04 22:29:47 -0800388 if (entry != NULL)
389 kfree(entry->domain);
390 kfree(entry);
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500391 kfree(addrmap);
392 kfree(addrinfo);
393 return ret_val;
Paul Mooreeda61d32008-02-04 22:29:47 -0800394}
395
Paul Mooreeda61d32008-02-04 22:29:47 -0800396/*
Paul Moore02752762006-11-29 13:18:18 -0500397 * Security Attribute Functions
398 */
399
400/**
401 * netlbl_secattr_catmap_walk - Walk a LSM secattr catmap looking for a bit
402 * @catmap: the category bitmap
403 * @offset: the offset to start searching at, in bits
404 *
405 * Description:
406 * This function walks a LSM secattr category bitmap starting at @offset and
407 * returns the spot of the first set bit or -ENOENT if no bits are set.
408 *
409 */
410int netlbl_secattr_catmap_walk(struct netlbl_lsm_secattr_catmap *catmap,
411 u32 offset)
412{
413 struct netlbl_lsm_secattr_catmap *iter = catmap;
414 u32 node_idx;
415 u32 node_bit;
416 NETLBL_CATMAP_MAPTYPE bitmap;
417
418 if (offset > iter->startbit) {
419 while (offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
420 iter = iter->next;
421 if (iter == NULL)
422 return -ENOENT;
423 }
424 node_idx = (offset - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
425 node_bit = offset - iter->startbit -
426 (NETLBL_CATMAP_MAPSIZE * node_idx);
427 } else {
428 node_idx = 0;
429 node_bit = 0;
430 }
431 bitmap = iter->bitmap[node_idx] >> node_bit;
432
433 for (;;) {
434 if (bitmap != 0) {
435 while ((bitmap & NETLBL_CATMAP_BIT) == 0) {
436 bitmap >>= 1;
437 node_bit++;
438 }
439 return iter->startbit +
440 (NETLBL_CATMAP_MAPSIZE * node_idx) + node_bit;
441 }
442 if (++node_idx >= NETLBL_CATMAP_MAPCNT) {
443 if (iter->next != NULL) {
444 iter = iter->next;
445 node_idx = 0;
446 } else
447 return -ENOENT;
448 }
449 bitmap = iter->bitmap[node_idx];
450 node_bit = 0;
451 }
452
453 return -ENOENT;
454}
455
456/**
457 * netlbl_secattr_catmap_walk_rng - Find the end of a string of set bits
458 * @catmap: the category bitmap
459 * @offset: the offset to start searching at, in bits
460 *
461 * Description:
462 * This function walks a LSM secattr category bitmap starting at @offset and
463 * returns the spot of the first cleared bit or -ENOENT if the offset is past
464 * the end of the bitmap.
465 *
466 */
467int netlbl_secattr_catmap_walk_rng(struct netlbl_lsm_secattr_catmap *catmap,
468 u32 offset)
469{
470 struct netlbl_lsm_secattr_catmap *iter = catmap;
471 u32 node_idx;
472 u32 node_bit;
473 NETLBL_CATMAP_MAPTYPE bitmask;
474 NETLBL_CATMAP_MAPTYPE bitmap;
475
476 if (offset > iter->startbit) {
477 while (offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
478 iter = iter->next;
479 if (iter == NULL)
480 return -ENOENT;
481 }
482 node_idx = (offset - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
483 node_bit = offset - iter->startbit -
484 (NETLBL_CATMAP_MAPSIZE * node_idx);
485 } else {
486 node_idx = 0;
487 node_bit = 0;
488 }
489 bitmask = NETLBL_CATMAP_BIT << node_bit;
490
491 for (;;) {
492 bitmap = iter->bitmap[node_idx];
493 while (bitmask != 0 && (bitmap & bitmask) != 0) {
494 bitmask <<= 1;
495 node_bit++;
496 }
497
498 if (bitmask != 0)
499 return iter->startbit +
500 (NETLBL_CATMAP_MAPSIZE * node_idx) +
501 node_bit - 1;
502 else if (++node_idx >= NETLBL_CATMAP_MAPCNT) {
503 if (iter->next == NULL)
504 return iter->startbit + NETLBL_CATMAP_SIZE - 1;
505 iter = iter->next;
506 node_idx = 0;
507 }
508 bitmask = NETLBL_CATMAP_BIT;
509 node_bit = 0;
510 }
511
512 return -ENOENT;
513}
514
515/**
516 * netlbl_secattr_catmap_setbit - Set a bit in a LSM secattr catmap
517 * @catmap: the category bitmap
518 * @bit: the bit to set
519 * @flags: memory allocation flags
520 *
521 * Description:
522 * Set the bit specified by @bit in @catmap. Returns zero on success,
523 * negative values on failure.
524 *
525 */
526int netlbl_secattr_catmap_setbit(struct netlbl_lsm_secattr_catmap *catmap,
527 u32 bit,
528 gfp_t flags)
529{
530 struct netlbl_lsm_secattr_catmap *iter = catmap;
531 u32 node_bit;
532 u32 node_idx;
533
534 while (iter->next != NULL &&
535 bit >= (iter->startbit + NETLBL_CATMAP_SIZE))
536 iter = iter->next;
537 if (bit >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
538 iter->next = netlbl_secattr_catmap_alloc(flags);
539 if (iter->next == NULL)
540 return -ENOMEM;
541 iter = iter->next;
542 iter->startbit = bit & ~(NETLBL_CATMAP_SIZE - 1);
543 }
544
545 /* gcc always rounds to zero when doing integer division */
546 node_idx = (bit - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
547 node_bit = bit - iter->startbit - (NETLBL_CATMAP_MAPSIZE * node_idx);
548 iter->bitmap[node_idx] |= NETLBL_CATMAP_BIT << node_bit;
549
550 return 0;
551}
552
553/**
554 * netlbl_secattr_catmap_setrng - Set a range of bits in a LSM secattr catmap
555 * @catmap: the category bitmap
556 * @start: the starting bit
557 * @end: the last bit in the string
558 * @flags: memory allocation flags
559 *
560 * Description:
561 * Set a range of bits, starting at @start and ending with @end. Returns zero
562 * on success, negative values on failure.
563 *
564 */
565int netlbl_secattr_catmap_setrng(struct netlbl_lsm_secattr_catmap *catmap,
566 u32 start,
567 u32 end,
568 gfp_t flags)
569{
570 int ret_val = 0;
571 struct netlbl_lsm_secattr_catmap *iter = catmap;
572 u32 iter_max_spot;
573 u32 spot;
574
575 /* XXX - This could probably be made a bit faster by combining writes
576 * to the catmap instead of setting a single bit each time, but for
577 * right now skipping to the start of the range in the catmap should
578 * be a nice improvement over calling the individual setbit function
579 * repeatedly from a loop. */
580
581 while (iter->next != NULL &&
582 start >= (iter->startbit + NETLBL_CATMAP_SIZE))
583 iter = iter->next;
584 iter_max_spot = iter->startbit + NETLBL_CATMAP_SIZE;
585
586 for (spot = start; spot <= end && ret_val == 0; spot++) {
587 if (spot >= iter_max_spot && iter->next != NULL) {
588 iter = iter->next;
589 iter_max_spot = iter->startbit + NETLBL_CATMAP_SIZE;
590 }
591 ret_val = netlbl_secattr_catmap_setbit(iter, spot, GFP_ATOMIC);
592 }
593
594 return ret_val;
595}
596
597/*
Paul Moored15c3452006-08-03 16:48:37 -0700598 * LSM Functions
599 */
600
601/**
Paul Moore23bcdc12007-07-18 12:28:45 -0400602 * netlbl_enabled - Determine if the NetLabel subsystem is enabled
603 *
604 * Description:
605 * The LSM can use this function to determine if it should use NetLabel
606 * security attributes in it's enforcement mechanism. Currently, NetLabel is
607 * considered to be enabled when it's configuration contains a valid setup for
608 * at least one labeled protocol (i.e. NetLabel can understand incoming
609 * labeled packets of at least one type); otherwise NetLabel is considered to
610 * be disabled.
611 *
612 */
613int netlbl_enabled(void)
614{
615 /* At some point we probably want to expose this mechanism to the user
616 * as well so that admins can toggle NetLabel regardless of the
617 * configuration */
Paul Moorec783f1c2008-01-29 08:37:52 -0500618 return (atomic_read(&netlabel_mgmt_protocount) > 0);
Paul Moore23bcdc12007-07-18 12:28:45 -0400619}
620
621/**
Paul Moore389fb802009-03-27 17:10:34 -0400622 * netlbl_sock_setattr - Label a socket using the correct protocol
Paul Mooreba6ff9f2007-06-07 18:37:15 -0700623 * @sk: the socket to label
Paul Moore389fb802009-03-27 17:10:34 -0400624 * @family: protocol family
Paul Moored15c3452006-08-03 16:48:37 -0700625 * @secattr: the security attributes
626 *
627 * Description:
628 * Attach the correct label to the given socket using the security attributes
Paul Mooreba6ff9f2007-06-07 18:37:15 -0700629 * specified in @secattr. This function requires exclusive access to @sk,
630 * which means it either needs to be in the process of being created or locked.
Paul Moore63c41682008-10-10 10:16:32 -0400631 * Returns zero on success, -EDESTADDRREQ if the domain is configured to use
632 * network address selectors (can't blindly label the socket), and negative
633 * values on all other failures.
Paul Moored15c3452006-08-03 16:48:37 -0700634 *
635 */
Paul Mooreba6ff9f2007-06-07 18:37:15 -0700636int netlbl_sock_setattr(struct sock *sk,
Paul Moore389fb802009-03-27 17:10:34 -0400637 u16 family,
Paul Mooreba6ff9f2007-06-07 18:37:15 -0700638 const struct netlbl_lsm_secattr *secattr)
Paul Moored15c3452006-08-03 16:48:37 -0700639{
Paul Moore389fb802009-03-27 17:10:34 -0400640 int ret_val;
Paul Moored15c3452006-08-03 16:48:37 -0700641 struct netlbl_dom_map *dom_entry;
642
643 rcu_read_lock();
644 dom_entry = netlbl_domhsh_getentry(secattr->domain);
Paul Moore389fb802009-03-27 17:10:34 -0400645 if (dom_entry == NULL) {
646 ret_val = -ENOENT;
Paul Moored15c3452006-08-03 16:48:37 -0700647 goto socket_setattr_return;
Paul Moore389fb802009-03-27 17:10:34 -0400648 }
649 switch (family) {
650 case AF_INET:
651 switch (dom_entry->type) {
652 case NETLBL_NLTYPE_ADDRSELECT:
653 ret_val = -EDESTADDRREQ;
654 break;
655 case NETLBL_NLTYPE_CIPSOV4:
656 ret_val = cipso_v4_sock_setattr(sk,
657 dom_entry->type_def.cipsov4,
658 secattr);
659 break;
660 case NETLBL_NLTYPE_UNLABELED:
661 ret_val = 0;
662 break;
663 default:
664 ret_val = -ENOENT;
665 }
Paul Moore63c41682008-10-10 10:16:32 -0400666 break;
Paul Moore389fb802009-03-27 17:10:34 -0400667#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
668 case AF_INET6:
669 /* since we don't support any IPv6 labeling protocols right
670 * now we can optimize everything away until we do */
Paul Moored15c3452006-08-03 16:48:37 -0700671 ret_val = 0;
672 break;
Paul Moore389fb802009-03-27 17:10:34 -0400673#endif /* IPv6 */
Paul Moored15c3452006-08-03 16:48:37 -0700674 default:
Paul Moore389fb802009-03-27 17:10:34 -0400675 ret_val = -EPROTONOSUPPORT;
Paul Moored15c3452006-08-03 16:48:37 -0700676 }
677
678socket_setattr_return:
679 rcu_read_unlock();
680 return ret_val;
681}
682
683/**
Paul Moore014ab192008-10-10 10:16:33 -0400684 * netlbl_sock_delattr - Delete all the NetLabel labels on a socket
685 * @sk: the socket
686 *
687 * Description:
688 * Remove all the NetLabel labeling from @sk. The caller is responsible for
689 * ensuring that @sk is locked.
690 *
691 */
692void netlbl_sock_delattr(struct sock *sk)
693{
694 cipso_v4_sock_delattr(sk);
695}
696
697/**
Paul Moore14a72f52006-09-25 15:52:01 -0700698 * netlbl_sock_getattr - Determine the security attributes of a sock
699 * @sk: the sock
700 * @secattr: the security attributes
701 *
702 * Description:
Paul Moore8cc44572008-01-29 08:44:21 -0500703 * Examines the given sock to see if any NetLabel style labeling has been
Paul Moore14a72f52006-09-25 15:52:01 -0700704 * applied to the sock, if so it parses the socket label and returns the
705 * security attributes in @secattr. Returns zero on success, negative values
706 * on failure.
707 *
708 */
Paul Moore389fb802009-03-27 17:10:34 -0400709int netlbl_sock_getattr(struct sock *sk,
710 struct netlbl_lsm_secattr *secattr)
Paul Moore14a72f52006-09-25 15:52:01 -0700711{
Paul Moore389fb802009-03-27 17:10:34 -0400712 int ret_val;
713
714 switch (sk->sk_family) {
715 case AF_INET:
716 ret_val = cipso_v4_sock_getattr(sk, secattr);
717 break;
718#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
719 case AF_INET6:
720 ret_val = -ENOMSG;
721 break;
722#endif /* IPv6 */
723 default:
724 ret_val = -EPROTONOSUPPORT;
725 }
726
727 return ret_val;
Paul Moore14a72f52006-09-25 15:52:01 -0700728}
729
730/**
Paul Moore014ab192008-10-10 10:16:33 -0400731 * netlbl_conn_setattr - Label a connected socket using the correct protocol
732 * @sk: the socket to label
733 * @addr: the destination address
734 * @secattr: the security attributes
735 *
736 * Description:
737 * Attach the correct label to the given connected socket using the security
738 * attributes specified in @secattr. The caller is responsible for ensuring
739 * that @sk is locked. Returns zero on success, negative values on failure.
740 *
741 */
742int netlbl_conn_setattr(struct sock *sk,
743 struct sockaddr *addr,
744 const struct netlbl_lsm_secattr *secattr)
745{
746 int ret_val;
747 struct sockaddr_in *addr4;
748 struct netlbl_domaddr4_map *af4_entry;
749
750 rcu_read_lock();
751 switch (addr->sa_family) {
752 case AF_INET:
753 addr4 = (struct sockaddr_in *)addr;
754 af4_entry = netlbl_domhsh_getentry_af4(secattr->domain,
755 addr4->sin_addr.s_addr);
756 if (af4_entry == NULL) {
757 ret_val = -ENOENT;
758 goto conn_setattr_return;
759 }
760 switch (af4_entry->type) {
761 case NETLBL_NLTYPE_CIPSOV4:
762 ret_val = cipso_v4_sock_setattr(sk,
763 af4_entry->type_def.cipsov4,
764 secattr);
765 break;
766 case NETLBL_NLTYPE_UNLABELED:
767 /* just delete the protocols we support for right now
768 * but we could remove other protocols if needed */
769 cipso_v4_sock_delattr(sk);
770 ret_val = 0;
771 break;
772 default:
773 ret_val = -ENOENT;
774 }
775 break;
776#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
777 case AF_INET6:
778 /* since we don't support any IPv6 labeling protocols right
779 * now we can optimize everything away until we do */
780 ret_val = 0;
781 break;
782#endif /* IPv6 */
783 default:
Paul Moore389fb802009-03-27 17:10:34 -0400784 ret_val = -EPROTONOSUPPORT;
Paul Moore014ab192008-10-10 10:16:33 -0400785 }
786
787conn_setattr_return:
788 rcu_read_unlock();
789 return ret_val;
790}
791
792/**
Paul Moore389fb802009-03-27 17:10:34 -0400793 * netlbl_req_setattr - Label a request socket using the correct protocol
794 * @req: the request socket to label
795 * @secattr: the security attributes
796 *
797 * Description:
798 * Attach the correct label to the given socket using the security attributes
799 * specified in @secattr. Returns zero on success, negative values on failure.
800 *
801 */
802int netlbl_req_setattr(struct request_sock *req,
803 const struct netlbl_lsm_secattr *secattr)
804{
805 int ret_val;
806 struct netlbl_dom_map *dom_entry;
807 struct netlbl_domaddr4_map *af4_entry;
808 u32 proto_type;
809 struct cipso_v4_doi *proto_cv4;
810
811 rcu_read_lock();
812 dom_entry = netlbl_domhsh_getentry(secattr->domain);
813 if (dom_entry == NULL) {
814 ret_val = -ENOENT;
815 goto req_setattr_return;
816 }
817 switch (req->rsk_ops->family) {
818 case AF_INET:
819 if (dom_entry->type == NETLBL_NLTYPE_ADDRSELECT) {
820 struct inet_request_sock *req_inet = inet_rsk(req);
821 af4_entry = netlbl_domhsh_getentry_af4(secattr->domain,
822 req_inet->rmt_addr);
823 if (af4_entry == NULL) {
824 ret_val = -ENOENT;
825 goto req_setattr_return;
826 }
827 proto_type = af4_entry->type;
828 proto_cv4 = af4_entry->type_def.cipsov4;
829 } else {
830 proto_type = dom_entry->type;
831 proto_cv4 = dom_entry->type_def.cipsov4;
832 }
833 switch (proto_type) {
834 case NETLBL_NLTYPE_CIPSOV4:
835 ret_val = cipso_v4_req_setattr(req, proto_cv4, secattr);
836 break;
837 case NETLBL_NLTYPE_UNLABELED:
838 /* just delete the protocols we support for right now
839 * but we could remove other protocols if needed */
840 cipso_v4_req_delattr(req);
841 ret_val = 0;
842 break;
843 default:
844 ret_val = -ENOENT;
845 }
846 break;
847#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
848 case AF_INET6:
849 /* since we don't support any IPv6 labeling protocols right
850 * now we can optimize everything away until we do */
851 ret_val = 0;
852 break;
853#endif /* IPv6 */
854 default:
855 ret_val = -EPROTONOSUPPORT;
856 }
857
858req_setattr_return:
859 rcu_read_unlock();
860 return ret_val;
861}
862
863/**
Paul Moore07feee82009-03-27 17:10:54 -0400864* netlbl_req_delattr - Delete all the NetLabel labels on a socket
865* @req: the socket
866*
867* Description:
868* Remove all the NetLabel labeling from @req.
869*
870*/
871void netlbl_req_delattr(struct request_sock *req)
872{
873 cipso_v4_req_delattr(req);
874}
875
876/**
Paul Moore948bf852008-10-10 10:16:32 -0400877 * netlbl_skbuff_setattr - Label a packet using the correct protocol
878 * @skb: the packet
879 * @family: protocol family
880 * @secattr: the security attributes
881 *
882 * Description:
883 * Attach the correct label to the given packet using the security attributes
884 * specified in @secattr. Returns zero on success, negative values on failure.
885 *
886 */
887int netlbl_skbuff_setattr(struct sk_buff *skb,
888 u16 family,
889 const struct netlbl_lsm_secattr *secattr)
890{
891 int ret_val;
892 struct iphdr *hdr4;
893 struct netlbl_domaddr4_map *af4_entry;
894
895 rcu_read_lock();
896 switch (family) {
897 case AF_INET:
898 hdr4 = ip_hdr(skb);
899 af4_entry = netlbl_domhsh_getentry_af4(secattr->domain,
900 hdr4->daddr);
901 if (af4_entry == NULL) {
902 ret_val = -ENOENT;
903 goto skbuff_setattr_return;
904 }
905 switch (af4_entry->type) {
906 case NETLBL_NLTYPE_CIPSOV4:
907 ret_val = cipso_v4_skbuff_setattr(skb,
908 af4_entry->type_def.cipsov4,
909 secattr);
910 break;
911 case NETLBL_NLTYPE_UNLABELED:
912 /* just delete the protocols we support for right now
913 * but we could remove other protocols if needed */
914 ret_val = cipso_v4_skbuff_delattr(skb);
915 break;
916 default:
917 ret_val = -ENOENT;
918 }
919 break;
920#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
921 case AF_INET6:
922 /* since we don't support any IPv6 labeling protocols right
923 * now we can optimize everything away until we do */
924 ret_val = 0;
925 break;
926#endif /* IPv6 */
927 default:
Paul Moore389fb802009-03-27 17:10:34 -0400928 ret_val = -EPROTONOSUPPORT;
Paul Moore948bf852008-10-10 10:16:32 -0400929 }
930
931skbuff_setattr_return:
932 rcu_read_unlock();
933 return ret_val;
934}
935
936/**
Paul Moored15c3452006-08-03 16:48:37 -0700937 * netlbl_skbuff_getattr - Determine the security attributes of a packet
938 * @skb: the packet
Paul Moore75e22912008-01-29 08:38:04 -0500939 * @family: protocol family
Paul Moored15c3452006-08-03 16:48:37 -0700940 * @secattr: the security attributes
941 *
942 * Description:
943 * Examines the given packet to see if a recognized form of packet labeling
944 * is present, if so it parses the packet label and returns the security
945 * attributes in @secattr. Returns zero on success, negative values on
946 * failure.
947 *
948 */
949int netlbl_skbuff_getattr(const struct sk_buff *skb,
Paul Moore75e22912008-01-29 08:38:04 -0500950 u16 family,
Paul Moored15c3452006-08-03 16:48:37 -0700951 struct netlbl_lsm_secattr *secattr)
952{
Paul Moore389fb802009-03-27 17:10:34 -0400953 switch (family) {
954 case AF_INET:
955 if (CIPSO_V4_OPTEXIST(skb) &&
956 cipso_v4_skbuff_getattr(skb, secattr) == 0)
957 return 0;
958 break;
959#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
960 case AF_INET6:
961 break;
962#endif /* IPv6 */
963 }
Paul Moored15c3452006-08-03 16:48:37 -0700964
Paul Moore8cc44572008-01-29 08:44:21 -0500965 return netlbl_unlabel_getattr(skb, family, secattr);
Paul Moored15c3452006-08-03 16:48:37 -0700966}
967
968/**
969 * netlbl_skbuff_err - Handle a LSM error on a sk_buff
970 * @skb: the packet
971 * @error: the error code
Paul Mooredfaebe92008-10-10 10:16:31 -0400972 * @gateway: true if host is acting as a gateway, false otherwise
Paul Moored15c3452006-08-03 16:48:37 -0700973 *
974 * Description:
975 * Deal with a LSM problem when handling the packet in @skb, typically this is
976 * a permission denied problem (-EACCES). The correct action is determined
977 * according to the packet's labeling protocol.
978 *
979 */
Paul Mooredfaebe92008-10-10 10:16:31 -0400980void netlbl_skbuff_err(struct sk_buff *skb, int error, int gateway)
Paul Moored15c3452006-08-03 16:48:37 -0700981{
982 if (CIPSO_V4_OPTEXIST(skb))
Paul Mooredfaebe92008-10-10 10:16:31 -0400983 cipso_v4_error(skb, error, gateway);
Paul Moored15c3452006-08-03 16:48:37 -0700984}
985
986/**
987 * netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches
988 *
989 * Description:
990 * For all of the NetLabel protocols that support some form of label mapping
991 * cache, invalidate the cache. Returns zero on success, negative values on
992 * error.
993 *
994 */
995void netlbl_cache_invalidate(void)
996{
997 cipso_v4_cache_invalidate();
998}
999
1000/**
1001 * netlbl_cache_add - Add an entry to a NetLabel protocol cache
1002 * @skb: the packet
1003 * @secattr: the packet's security attributes
1004 *
1005 * Description:
1006 * Add the LSM security attributes for the given packet to the underlying
1007 * NetLabel protocol's label mapping cache. Returns zero on success, negative
1008 * values on error.
1009 *
1010 */
1011int netlbl_cache_add(const struct sk_buff *skb,
1012 const struct netlbl_lsm_secattr *secattr)
1013{
Paul Moore701a90b2006-11-17 17:38:46 -05001014 if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0)
Paul Moored15c3452006-08-03 16:48:37 -07001015 return -ENOMSG;
1016
1017 if (CIPSO_V4_OPTEXIST(skb))
1018 return cipso_v4_cache_add(skb, secattr);
1019
1020 return -ENOMSG;
1021}
1022
1023/*
Paul Moore6c2e8ac2008-12-31 12:54:11 -05001024 * Protocol Engine Functions
1025 */
1026
1027/**
1028 * netlbl_audit_start - Start an audit message
1029 * @type: audit message type
1030 * @audit_info: NetLabel audit information
1031 *
1032 * Description:
1033 * Start an audit message using the type specified in @type and fill the audit
1034 * message with some fields common to all NetLabel audit messages. This
1035 * function should only be used by protocol engines, not LSMs. Returns a
1036 * pointer to the audit buffer on success, NULL on failure.
1037 *
1038 */
1039struct audit_buffer *netlbl_audit_start(int type,
1040 struct netlbl_audit *audit_info)
1041{
1042 return netlbl_audit_start_common(type, audit_info);
1043}
1044
1045/*
Paul Moored15c3452006-08-03 16:48:37 -07001046 * Setup Functions
1047 */
1048
1049/**
1050 * netlbl_init - Initialize NetLabel
1051 *
1052 * Description:
1053 * Perform the required NetLabel initialization before first use.
1054 *
1055 */
1056static int __init netlbl_init(void)
1057{
1058 int ret_val;
1059
1060 printk(KERN_INFO "NetLabel: Initializing\n");
1061 printk(KERN_INFO "NetLabel: domain hash size = %u\n",
1062 (1 << NETLBL_DOMHSH_BITSIZE));
1063 printk(KERN_INFO "NetLabel: protocols ="
1064 " UNLABELED"
1065 " CIPSOv4"
1066 "\n");
1067
1068 ret_val = netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE);
1069 if (ret_val != 0)
1070 goto init_failure;
1071
Paul Moore8cc44572008-01-29 08:44:21 -05001072 ret_val = netlbl_unlabel_init(NETLBL_UNLHSH_BITSIZE);
1073 if (ret_val != 0)
1074 goto init_failure;
1075
Paul Moored15c3452006-08-03 16:48:37 -07001076 ret_val = netlbl_netlink_init();
1077 if (ret_val != 0)
1078 goto init_failure;
1079
1080 ret_val = netlbl_unlabel_defconf();
1081 if (ret_val != 0)
1082 goto init_failure;
1083 printk(KERN_INFO "NetLabel: unlabeled traffic allowed by default\n");
1084
1085 return 0;
1086
1087init_failure:
1088 panic("NetLabel: failed to initialize properly (%d)\n", ret_val);
1089}
1090
1091subsys_initcall(netlbl_init);