blob: 6ce00205f3425cd079b7a64526db259f9ae58d47 [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);
Julia Lawallca7daea2009-07-30 04:38:19 +0000154 if (map6 == NULL)
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500155 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:
Julia Lawall47943232009-07-27 06:15:43 +0000188 kfree(entry->domain);
Paul Mooreeda61d32008-02-04 22:29:47 -0800189 kfree(entry);
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500190 kfree(addrmap);
191 kfree(map4);
192 kfree(map6);
Paul Mooreeda61d32008-02-04 22:29:47 -0800193 return ret_val;
194}
195
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500196
Paul Mooreeda61d32008-02-04 22:29:47 -0800197/**
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500198 * netlbl_cfg_unlbl_static_add - Adds a new static label
199 * @net: network namespace
200 * @dev_name: interface name
201 * @addr: IP address in network byte order (struct in[6]_addr)
202 * @mask: address mask in network byte order (struct in[6]_addr)
203 * @family: address family
204 * @secid: LSM secid value for the entry
Paul Mooreeda61d32008-02-04 22:29:47 -0800205 * @audit_info: NetLabel audit information
206 *
207 * Description:
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500208 * Adds a new NetLabel static label to be used when protocol provided labels
209 * are not present on incoming traffic. If @dev_name is NULL then the default
210 * interface will be used. Returns zero on success, negative values on failure.
Paul Mooreeda61d32008-02-04 22:29:47 -0800211 *
212 */
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500213int netlbl_cfg_unlbl_static_add(struct net *net,
214 const char *dev_name,
215 const void *addr,
216 const void *mask,
217 u16 family,
218 u32 secid,
219 struct netlbl_audit *audit_info)
220{
221 u32 addr_len;
222
223 switch (family) {
224 case AF_INET:
225 addr_len = sizeof(struct in_addr);
226 break;
227 case AF_INET6:
228 addr_len = sizeof(struct in6_addr);
229 break;
230 default:
231 return -EPFNOSUPPORT;
232 }
233
234 return netlbl_unlhsh_add(net,
235 dev_name, addr, mask, addr_len,
236 secid, audit_info);
237}
238
239/**
240 * netlbl_cfg_unlbl_static_del - Removes an existing static label
241 * @net: network namespace
242 * @dev_name: interface name
243 * @addr: IP address in network byte order (struct in[6]_addr)
244 * @mask: address mask in network byte order (struct in[6]_addr)
245 * @family: address family
246 * @secid: LSM secid value for the entry
247 * @audit_info: NetLabel audit information
248 *
249 * Description:
250 * Removes an existing NetLabel static label used when protocol provided labels
251 * are not present on incoming traffic. If @dev_name is NULL then the default
252 * interface will be used. Returns zero on success, negative values on failure.
253 *
254 */
255int netlbl_cfg_unlbl_static_del(struct net *net,
256 const char *dev_name,
257 const void *addr,
258 const void *mask,
259 u16 family,
260 struct netlbl_audit *audit_info)
261{
262 u32 addr_len;
263
264 switch (family) {
265 case AF_INET:
266 addr_len = sizeof(struct in_addr);
267 break;
268 case AF_INET6:
269 addr_len = sizeof(struct in6_addr);
270 break;
271 default:
272 return -EPFNOSUPPORT;
273 }
274
275 return netlbl_unlhsh_remove(net,
276 dev_name, addr, mask, addr_len,
277 audit_info);
278}
279
280/**
281 * netlbl_cfg_cipsov4_add - Add a new CIPSOv4 DOI definition
282 * @doi_def: CIPSO DOI definition
283 * @audit_info: NetLabel audit information
284 *
285 * Description:
286 * Add a new CIPSO DOI definition as defined by @doi_def. Returns zero on
287 * success and negative values on failure.
288 *
289 */
290int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def,
291 struct netlbl_audit *audit_info)
292{
293 return cipso_v4_doi_add(doi_def, audit_info);
294}
295
296/**
297 * netlbl_cfg_cipsov4_del - Remove an existing CIPSOv4 DOI definition
298 * @doi: CIPSO DOI
299 * @audit_info: NetLabel audit information
300 *
301 * Description:
302 * Remove an existing CIPSO DOI definition matching @doi. Returns zero on
303 * success and negative values on failure.
304 *
305 */
306void netlbl_cfg_cipsov4_del(u32 doi, struct netlbl_audit *audit_info)
307{
308 cipso_v4_doi_remove(doi, audit_info);
309}
310
311/**
312 * netlbl_cfg_cipsov4_map_add - Add a new CIPSOv4 DOI mapping
313 * @doi: the CIPSO DOI
314 * @domain: the domain mapping to add
315 * @addr: IP address
316 * @mask: IP address mask
317 * @audit_info: NetLabel audit information
318 *
319 * Description:
320 * Add a new NetLabel/LSM domain mapping for the given CIPSO DOI to the NetLabel
321 * subsystem. A @domain value of NULL adds a new default domain mapping.
322 * Returns zero on success, negative values on failure.
323 *
324 */
325int netlbl_cfg_cipsov4_map_add(u32 doi,
Paul Mooreeda61d32008-02-04 22:29:47 -0800326 const char *domain,
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500327 const struct in_addr *addr,
328 const struct in_addr *mask,
Paul Mooreeda61d32008-02-04 22:29:47 -0800329 struct netlbl_audit *audit_info)
330{
331 int ret_val = -ENOMEM;
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500332 struct cipso_v4_doi *doi_def;
Paul Mooreeda61d32008-02-04 22:29:47 -0800333 struct netlbl_dom_map *entry;
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500334 struct netlbl_domaddr_map *addrmap = NULL;
335 struct netlbl_domaddr4_map *addrinfo = NULL;
Paul Mooreeda61d32008-02-04 22:29:47 -0800336
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500337 doi_def = cipso_v4_doi_getdef(doi);
338 if (doi_def == NULL)
339 return -ENOENT;
Paul Mooreb1edeb12008-10-10 10:16:31 -0400340
Paul Mooreeda61d32008-02-04 22:29:47 -0800341 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
342 if (entry == NULL)
Paul Moore948a7242008-10-10 10:16:30 -0400343 return -ENOMEM;
Paul Mooreeda61d32008-02-04 22:29:47 -0800344 if (domain != NULL) {
345 entry->domain = kstrdup(domain, GFP_ATOMIC);
346 if (entry->domain == NULL)
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500347 goto cfg_cipsov4_map_add_failure;
Paul Mooreeda61d32008-02-04 22:29:47 -0800348 }
Paul Mooreeda61d32008-02-04 22:29:47 -0800349
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500350 if (addr == NULL && mask == NULL) {
351 entry->type_def.cipsov4 = doi_def;
352 entry->type = NETLBL_NLTYPE_CIPSOV4;
353 } else if (addr != NULL && mask != NULL) {
354 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
355 if (addrmap == NULL)
356 goto cfg_cipsov4_map_add_failure;
357 INIT_LIST_HEAD(&addrmap->list4);
358 INIT_LIST_HEAD(&addrmap->list6);
359
360 addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC);
361 if (addrinfo == NULL)
362 goto cfg_cipsov4_map_add_failure;
363 addrinfo->type_def.cipsov4 = doi_def;
364 addrinfo->type = NETLBL_NLTYPE_CIPSOV4;
365 addrinfo->list.addr = addr->s_addr & mask->s_addr;
366 addrinfo->list.mask = mask->s_addr;
367 addrinfo->list.valid = 1;
368 ret_val = netlbl_af4list_add(&addrinfo->list, &addrmap->list4);
369 if (ret_val != 0)
370 goto cfg_cipsov4_map_add_failure;
371
372 entry->type_def.addrsel = addrmap;
373 entry->type = NETLBL_NLTYPE_ADDRSELECT;
374 } else {
375 ret_val = -EINVAL;
376 goto cfg_cipsov4_map_add_failure;
Paul Mooreb1edeb12008-10-10 10:16:31 -0400377 }
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500378
Paul Mooreeda61d32008-02-04 22:29:47 -0800379 ret_val = netlbl_domhsh_add(entry, audit_info);
380 if (ret_val != 0)
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500381 goto cfg_cipsov4_map_add_failure;
Paul Mooreeda61d32008-02-04 22:29:47 -0800382
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500383 return 0;
Paul Mooreb1edeb12008-10-10 10:16:31 -0400384
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500385cfg_cipsov4_map_add_failure:
Paul Mooreb1edeb12008-10-10 10:16:31 -0400386 cipso_v4_doi_putdef(doi_def);
Julia Lawall47943232009-07-27 06:15:43 +0000387 kfree(entry->domain);
Paul Mooreeda61d32008-02-04 22:29:47 -0800388 kfree(entry);
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500389 kfree(addrmap);
390 kfree(addrinfo);
391 return ret_val;
Paul Mooreeda61d32008-02-04 22:29:47 -0800392}
393
Paul Mooreeda61d32008-02-04 22:29:47 -0800394/*
Paul Moore02752762006-11-29 13:18:18 -0500395 * Security Attribute Functions
396 */
397
398/**
399 * netlbl_secattr_catmap_walk - Walk a LSM secattr catmap looking for a bit
400 * @catmap: the category bitmap
401 * @offset: the offset to start searching at, in bits
402 *
403 * Description:
404 * This function walks a LSM secattr category bitmap starting at @offset and
405 * returns the spot of the first set bit or -ENOENT if no bits are set.
406 *
407 */
408int netlbl_secattr_catmap_walk(struct netlbl_lsm_secattr_catmap *catmap,
409 u32 offset)
410{
411 struct netlbl_lsm_secattr_catmap *iter = catmap;
412 u32 node_idx;
413 u32 node_bit;
414 NETLBL_CATMAP_MAPTYPE bitmap;
415
416 if (offset > iter->startbit) {
417 while (offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
418 iter = iter->next;
419 if (iter == NULL)
420 return -ENOENT;
421 }
422 node_idx = (offset - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
423 node_bit = offset - iter->startbit -
424 (NETLBL_CATMAP_MAPSIZE * node_idx);
425 } else {
426 node_idx = 0;
427 node_bit = 0;
428 }
429 bitmap = iter->bitmap[node_idx] >> node_bit;
430
431 for (;;) {
432 if (bitmap != 0) {
433 while ((bitmap & NETLBL_CATMAP_BIT) == 0) {
434 bitmap >>= 1;
435 node_bit++;
436 }
437 return iter->startbit +
438 (NETLBL_CATMAP_MAPSIZE * node_idx) + node_bit;
439 }
440 if (++node_idx >= NETLBL_CATMAP_MAPCNT) {
441 if (iter->next != NULL) {
442 iter = iter->next;
443 node_idx = 0;
444 } else
445 return -ENOENT;
446 }
447 bitmap = iter->bitmap[node_idx];
448 node_bit = 0;
449 }
450
451 return -ENOENT;
452}
453
454/**
455 * netlbl_secattr_catmap_walk_rng - Find the end of a string of set bits
456 * @catmap: the category bitmap
457 * @offset: the offset to start searching at, in bits
458 *
459 * Description:
460 * This function walks a LSM secattr category bitmap starting at @offset and
461 * returns the spot of the first cleared bit or -ENOENT if the offset is past
462 * the end of the bitmap.
463 *
464 */
465int netlbl_secattr_catmap_walk_rng(struct netlbl_lsm_secattr_catmap *catmap,
466 u32 offset)
467{
468 struct netlbl_lsm_secattr_catmap *iter = catmap;
469 u32 node_idx;
470 u32 node_bit;
471 NETLBL_CATMAP_MAPTYPE bitmask;
472 NETLBL_CATMAP_MAPTYPE bitmap;
473
474 if (offset > iter->startbit) {
475 while (offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
476 iter = iter->next;
477 if (iter == NULL)
478 return -ENOENT;
479 }
480 node_idx = (offset - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
481 node_bit = offset - iter->startbit -
482 (NETLBL_CATMAP_MAPSIZE * node_idx);
483 } else {
484 node_idx = 0;
485 node_bit = 0;
486 }
487 bitmask = NETLBL_CATMAP_BIT << node_bit;
488
489 for (;;) {
490 bitmap = iter->bitmap[node_idx];
491 while (bitmask != 0 && (bitmap & bitmask) != 0) {
492 bitmask <<= 1;
493 node_bit++;
494 }
495
496 if (bitmask != 0)
497 return iter->startbit +
498 (NETLBL_CATMAP_MAPSIZE * node_idx) +
499 node_bit - 1;
500 else if (++node_idx >= NETLBL_CATMAP_MAPCNT) {
501 if (iter->next == NULL)
502 return iter->startbit + NETLBL_CATMAP_SIZE - 1;
503 iter = iter->next;
504 node_idx = 0;
505 }
506 bitmask = NETLBL_CATMAP_BIT;
507 node_bit = 0;
508 }
509
510 return -ENOENT;
511}
512
513/**
514 * netlbl_secattr_catmap_setbit - Set a bit in a LSM secattr catmap
515 * @catmap: the category bitmap
516 * @bit: the bit to set
517 * @flags: memory allocation flags
518 *
519 * Description:
520 * Set the bit specified by @bit in @catmap. Returns zero on success,
521 * negative values on failure.
522 *
523 */
524int netlbl_secattr_catmap_setbit(struct netlbl_lsm_secattr_catmap *catmap,
525 u32 bit,
526 gfp_t flags)
527{
528 struct netlbl_lsm_secattr_catmap *iter = catmap;
529 u32 node_bit;
530 u32 node_idx;
531
532 while (iter->next != NULL &&
533 bit >= (iter->startbit + NETLBL_CATMAP_SIZE))
534 iter = iter->next;
535 if (bit >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
536 iter->next = netlbl_secattr_catmap_alloc(flags);
537 if (iter->next == NULL)
538 return -ENOMEM;
539 iter = iter->next;
540 iter->startbit = bit & ~(NETLBL_CATMAP_SIZE - 1);
541 }
542
543 /* gcc always rounds to zero when doing integer division */
544 node_idx = (bit - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
545 node_bit = bit - iter->startbit - (NETLBL_CATMAP_MAPSIZE * node_idx);
546 iter->bitmap[node_idx] |= NETLBL_CATMAP_BIT << node_bit;
547
548 return 0;
549}
550
551/**
552 * netlbl_secattr_catmap_setrng - Set a range of bits in a LSM secattr catmap
553 * @catmap: the category bitmap
554 * @start: the starting bit
555 * @end: the last bit in the string
556 * @flags: memory allocation flags
557 *
558 * Description:
559 * Set a range of bits, starting at @start and ending with @end. Returns zero
560 * on success, negative values on failure.
561 *
562 */
563int netlbl_secattr_catmap_setrng(struct netlbl_lsm_secattr_catmap *catmap,
564 u32 start,
565 u32 end,
566 gfp_t flags)
567{
568 int ret_val = 0;
569 struct netlbl_lsm_secattr_catmap *iter = catmap;
570 u32 iter_max_spot;
571 u32 spot;
572
573 /* XXX - This could probably be made a bit faster by combining writes
574 * to the catmap instead of setting a single bit each time, but for
575 * right now skipping to the start of the range in the catmap should
576 * be a nice improvement over calling the individual setbit function
577 * repeatedly from a loop. */
578
579 while (iter->next != NULL &&
580 start >= (iter->startbit + NETLBL_CATMAP_SIZE))
581 iter = iter->next;
582 iter_max_spot = iter->startbit + NETLBL_CATMAP_SIZE;
583
584 for (spot = start; spot <= end && ret_val == 0; spot++) {
585 if (spot >= iter_max_spot && iter->next != NULL) {
586 iter = iter->next;
587 iter_max_spot = iter->startbit + NETLBL_CATMAP_SIZE;
588 }
589 ret_val = netlbl_secattr_catmap_setbit(iter, spot, GFP_ATOMIC);
590 }
591
592 return ret_val;
593}
594
595/*
Paul Moored15c3452006-08-03 16:48:37 -0700596 * LSM Functions
597 */
598
599/**
Paul Moore23bcdc12007-07-18 12:28:45 -0400600 * netlbl_enabled - Determine if the NetLabel subsystem is enabled
601 *
602 * Description:
603 * The LSM can use this function to determine if it should use NetLabel
604 * security attributes in it's enforcement mechanism. Currently, NetLabel is
605 * considered to be enabled when it's configuration contains a valid setup for
606 * at least one labeled protocol (i.e. NetLabel can understand incoming
607 * labeled packets of at least one type); otherwise NetLabel is considered to
608 * be disabled.
609 *
610 */
611int netlbl_enabled(void)
612{
613 /* At some point we probably want to expose this mechanism to the user
614 * as well so that admins can toggle NetLabel regardless of the
615 * configuration */
Paul Moorec783f1c2008-01-29 08:37:52 -0500616 return (atomic_read(&netlabel_mgmt_protocount) > 0);
Paul Moore23bcdc12007-07-18 12:28:45 -0400617}
618
619/**
Paul Moore389fb802009-03-27 17:10:34 -0400620 * netlbl_sock_setattr - Label a socket using the correct protocol
Paul Mooreba6ff9f2007-06-07 18:37:15 -0700621 * @sk: the socket to label
Paul Moore389fb802009-03-27 17:10:34 -0400622 * @family: protocol family
Paul Moored15c3452006-08-03 16:48:37 -0700623 * @secattr: the security attributes
624 *
625 * Description:
626 * Attach the correct label to the given socket using the security attributes
Paul Mooreba6ff9f2007-06-07 18:37:15 -0700627 * specified in @secattr. This function requires exclusive access to @sk,
628 * which means it either needs to be in the process of being created or locked.
Paul Moore63c41682008-10-10 10:16:32 -0400629 * Returns zero on success, -EDESTADDRREQ if the domain is configured to use
630 * network address selectors (can't blindly label the socket), and negative
631 * values on all other failures.
Paul Moored15c3452006-08-03 16:48:37 -0700632 *
633 */
Paul Mooreba6ff9f2007-06-07 18:37:15 -0700634int netlbl_sock_setattr(struct sock *sk,
Paul Moore389fb802009-03-27 17:10:34 -0400635 u16 family,
Paul Mooreba6ff9f2007-06-07 18:37:15 -0700636 const struct netlbl_lsm_secattr *secattr)
Paul Moored15c3452006-08-03 16:48:37 -0700637{
Paul Moore389fb802009-03-27 17:10:34 -0400638 int ret_val;
Paul Moored15c3452006-08-03 16:48:37 -0700639 struct netlbl_dom_map *dom_entry;
640
641 rcu_read_lock();
642 dom_entry = netlbl_domhsh_getentry(secattr->domain);
Paul Moore389fb802009-03-27 17:10:34 -0400643 if (dom_entry == NULL) {
644 ret_val = -ENOENT;
Paul Moored15c3452006-08-03 16:48:37 -0700645 goto socket_setattr_return;
Paul Moore389fb802009-03-27 17:10:34 -0400646 }
647 switch (family) {
648 case AF_INET:
649 switch (dom_entry->type) {
650 case NETLBL_NLTYPE_ADDRSELECT:
651 ret_val = -EDESTADDRREQ;
652 break;
653 case NETLBL_NLTYPE_CIPSOV4:
654 ret_val = cipso_v4_sock_setattr(sk,
655 dom_entry->type_def.cipsov4,
656 secattr);
657 break;
658 case NETLBL_NLTYPE_UNLABELED:
659 ret_val = 0;
660 break;
661 default:
662 ret_val = -ENOENT;
663 }
Paul Moore63c41682008-10-10 10:16:32 -0400664 break;
Paul Moore389fb802009-03-27 17:10:34 -0400665#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
666 case AF_INET6:
667 /* since we don't support any IPv6 labeling protocols right
668 * now we can optimize everything away until we do */
Paul Moored15c3452006-08-03 16:48:37 -0700669 ret_val = 0;
670 break;
Paul Moore389fb802009-03-27 17:10:34 -0400671#endif /* IPv6 */
Paul Moored15c3452006-08-03 16:48:37 -0700672 default:
Paul Moore389fb802009-03-27 17:10:34 -0400673 ret_val = -EPROTONOSUPPORT;
Paul Moored15c3452006-08-03 16:48:37 -0700674 }
675
676socket_setattr_return:
677 rcu_read_unlock();
678 return ret_val;
679}
680
681/**
Paul Moore014ab192008-10-10 10:16:33 -0400682 * netlbl_sock_delattr - Delete all the NetLabel labels on a socket
683 * @sk: the socket
684 *
685 * Description:
686 * Remove all the NetLabel labeling from @sk. The caller is responsible for
687 * ensuring that @sk is locked.
688 *
689 */
690void netlbl_sock_delattr(struct sock *sk)
691{
692 cipso_v4_sock_delattr(sk);
693}
694
695/**
Paul Moore14a72f52006-09-25 15:52:01 -0700696 * netlbl_sock_getattr - Determine the security attributes of a sock
697 * @sk: the sock
698 * @secattr: the security attributes
699 *
700 * Description:
Paul Moore8cc44572008-01-29 08:44:21 -0500701 * Examines the given sock to see if any NetLabel style labeling has been
Paul Moore14a72f52006-09-25 15:52:01 -0700702 * applied to the sock, if so it parses the socket label and returns the
703 * security attributes in @secattr. Returns zero on success, negative values
704 * on failure.
705 *
706 */
Paul Moore389fb802009-03-27 17:10:34 -0400707int netlbl_sock_getattr(struct sock *sk,
708 struct netlbl_lsm_secattr *secattr)
Paul Moore14a72f52006-09-25 15:52:01 -0700709{
Paul Moore389fb802009-03-27 17:10:34 -0400710 int ret_val;
711
712 switch (sk->sk_family) {
713 case AF_INET:
714 ret_val = cipso_v4_sock_getattr(sk, secattr);
715 break;
716#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
717 case AF_INET6:
718 ret_val = -ENOMSG;
719 break;
720#endif /* IPv6 */
721 default:
722 ret_val = -EPROTONOSUPPORT;
723 }
724
725 return ret_val;
Paul Moore14a72f52006-09-25 15:52:01 -0700726}
727
728/**
Paul Moore014ab192008-10-10 10:16:33 -0400729 * netlbl_conn_setattr - Label a connected socket using the correct protocol
730 * @sk: the socket to label
731 * @addr: the destination address
732 * @secattr: the security attributes
733 *
734 * Description:
735 * Attach the correct label to the given connected socket using the security
736 * attributes specified in @secattr. The caller is responsible for ensuring
737 * that @sk is locked. Returns zero on success, negative values on failure.
738 *
739 */
740int netlbl_conn_setattr(struct sock *sk,
741 struct sockaddr *addr,
742 const struct netlbl_lsm_secattr *secattr)
743{
744 int ret_val;
745 struct sockaddr_in *addr4;
746 struct netlbl_domaddr4_map *af4_entry;
747
748 rcu_read_lock();
749 switch (addr->sa_family) {
750 case AF_INET:
751 addr4 = (struct sockaddr_in *)addr;
752 af4_entry = netlbl_domhsh_getentry_af4(secattr->domain,
753 addr4->sin_addr.s_addr);
754 if (af4_entry == NULL) {
755 ret_val = -ENOENT;
756 goto conn_setattr_return;
757 }
758 switch (af4_entry->type) {
759 case NETLBL_NLTYPE_CIPSOV4:
760 ret_val = cipso_v4_sock_setattr(sk,
761 af4_entry->type_def.cipsov4,
762 secattr);
763 break;
764 case NETLBL_NLTYPE_UNLABELED:
765 /* just delete the protocols we support for right now
766 * but we could remove other protocols if needed */
767 cipso_v4_sock_delattr(sk);
768 ret_val = 0;
769 break;
770 default:
771 ret_val = -ENOENT;
772 }
773 break;
774#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
775 case AF_INET6:
776 /* since we don't support any IPv6 labeling protocols right
777 * now we can optimize everything away until we do */
778 ret_val = 0;
779 break;
780#endif /* IPv6 */
781 default:
Paul Moore389fb802009-03-27 17:10:34 -0400782 ret_val = -EPROTONOSUPPORT;
Paul Moore014ab192008-10-10 10:16:33 -0400783 }
784
785conn_setattr_return:
786 rcu_read_unlock();
787 return ret_val;
788}
789
790/**
Paul Moore389fb802009-03-27 17:10:34 -0400791 * netlbl_req_setattr - Label a request socket using the correct protocol
792 * @req: the request socket to label
793 * @secattr: the security attributes
794 *
795 * Description:
796 * Attach the correct label to the given socket using the security attributes
797 * specified in @secattr. Returns zero on success, negative values on failure.
798 *
799 */
800int netlbl_req_setattr(struct request_sock *req,
801 const struct netlbl_lsm_secattr *secattr)
802{
803 int ret_val;
804 struct netlbl_dom_map *dom_entry;
805 struct netlbl_domaddr4_map *af4_entry;
806 u32 proto_type;
807 struct cipso_v4_doi *proto_cv4;
808
809 rcu_read_lock();
810 dom_entry = netlbl_domhsh_getentry(secattr->domain);
811 if (dom_entry == NULL) {
812 ret_val = -ENOENT;
813 goto req_setattr_return;
814 }
815 switch (req->rsk_ops->family) {
816 case AF_INET:
817 if (dom_entry->type == NETLBL_NLTYPE_ADDRSELECT) {
818 struct inet_request_sock *req_inet = inet_rsk(req);
819 af4_entry = netlbl_domhsh_getentry_af4(secattr->domain,
820 req_inet->rmt_addr);
821 if (af4_entry == NULL) {
822 ret_val = -ENOENT;
823 goto req_setattr_return;
824 }
825 proto_type = af4_entry->type;
826 proto_cv4 = af4_entry->type_def.cipsov4;
827 } else {
828 proto_type = dom_entry->type;
829 proto_cv4 = dom_entry->type_def.cipsov4;
830 }
831 switch (proto_type) {
832 case NETLBL_NLTYPE_CIPSOV4:
833 ret_val = cipso_v4_req_setattr(req, proto_cv4, secattr);
834 break;
835 case NETLBL_NLTYPE_UNLABELED:
836 /* just delete the protocols we support for right now
837 * but we could remove other protocols if needed */
838 cipso_v4_req_delattr(req);
839 ret_val = 0;
840 break;
841 default:
842 ret_val = -ENOENT;
843 }
844 break;
845#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
846 case AF_INET6:
847 /* since we don't support any IPv6 labeling protocols right
848 * now we can optimize everything away until we do */
849 ret_val = 0;
850 break;
851#endif /* IPv6 */
852 default:
853 ret_val = -EPROTONOSUPPORT;
854 }
855
856req_setattr_return:
857 rcu_read_unlock();
858 return ret_val;
859}
860
861/**
Paul Moore07feee82009-03-27 17:10:54 -0400862* netlbl_req_delattr - Delete all the NetLabel labels on a socket
863* @req: the socket
864*
865* Description:
866* Remove all the NetLabel labeling from @req.
867*
868*/
869void netlbl_req_delattr(struct request_sock *req)
870{
871 cipso_v4_req_delattr(req);
872}
873
874/**
Paul Moore948bf852008-10-10 10:16:32 -0400875 * netlbl_skbuff_setattr - Label a packet using the correct protocol
876 * @skb: the packet
877 * @family: protocol family
878 * @secattr: the security attributes
879 *
880 * Description:
881 * Attach the correct label to the given packet using the security attributes
882 * specified in @secattr. Returns zero on success, negative values on failure.
883 *
884 */
885int netlbl_skbuff_setattr(struct sk_buff *skb,
886 u16 family,
887 const struct netlbl_lsm_secattr *secattr)
888{
889 int ret_val;
890 struct iphdr *hdr4;
891 struct netlbl_domaddr4_map *af4_entry;
892
893 rcu_read_lock();
894 switch (family) {
895 case AF_INET:
896 hdr4 = ip_hdr(skb);
897 af4_entry = netlbl_domhsh_getentry_af4(secattr->domain,
898 hdr4->daddr);
899 if (af4_entry == NULL) {
900 ret_val = -ENOENT;
901 goto skbuff_setattr_return;
902 }
903 switch (af4_entry->type) {
904 case NETLBL_NLTYPE_CIPSOV4:
905 ret_val = cipso_v4_skbuff_setattr(skb,
906 af4_entry->type_def.cipsov4,
907 secattr);
908 break;
909 case NETLBL_NLTYPE_UNLABELED:
910 /* just delete the protocols we support for right now
911 * but we could remove other protocols if needed */
912 ret_val = cipso_v4_skbuff_delattr(skb);
913 break;
914 default:
915 ret_val = -ENOENT;
916 }
917 break;
918#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
919 case AF_INET6:
920 /* since we don't support any IPv6 labeling protocols right
921 * now we can optimize everything away until we do */
922 ret_val = 0;
923 break;
924#endif /* IPv6 */
925 default:
Paul Moore389fb802009-03-27 17:10:34 -0400926 ret_val = -EPROTONOSUPPORT;
Paul Moore948bf852008-10-10 10:16:32 -0400927 }
928
929skbuff_setattr_return:
930 rcu_read_unlock();
931 return ret_val;
932}
933
934/**
Paul Moored15c3452006-08-03 16:48:37 -0700935 * netlbl_skbuff_getattr - Determine the security attributes of a packet
936 * @skb: the packet
Paul Moore75e22912008-01-29 08:38:04 -0500937 * @family: protocol family
Paul Moored15c3452006-08-03 16:48:37 -0700938 * @secattr: the security attributes
939 *
940 * Description:
941 * Examines the given packet to see if a recognized form of packet labeling
942 * is present, if so it parses the packet label and returns the security
943 * attributes in @secattr. Returns zero on success, negative values on
944 * failure.
945 *
946 */
947int netlbl_skbuff_getattr(const struct sk_buff *skb,
Paul Moore75e22912008-01-29 08:38:04 -0500948 u16 family,
Paul Moored15c3452006-08-03 16:48:37 -0700949 struct netlbl_lsm_secattr *secattr)
950{
Paul Moore389fb802009-03-27 17:10:34 -0400951 switch (family) {
952 case AF_INET:
953 if (CIPSO_V4_OPTEXIST(skb) &&
954 cipso_v4_skbuff_getattr(skb, secattr) == 0)
955 return 0;
956 break;
957#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
958 case AF_INET6:
959 break;
960#endif /* IPv6 */
961 }
Paul Moored15c3452006-08-03 16:48:37 -0700962
Paul Moore8cc44572008-01-29 08:44:21 -0500963 return netlbl_unlabel_getattr(skb, family, secattr);
Paul Moored15c3452006-08-03 16:48:37 -0700964}
965
966/**
967 * netlbl_skbuff_err - Handle a LSM error on a sk_buff
968 * @skb: the packet
969 * @error: the error code
Paul Mooredfaebe92008-10-10 10:16:31 -0400970 * @gateway: true if host is acting as a gateway, false otherwise
Paul Moored15c3452006-08-03 16:48:37 -0700971 *
972 * Description:
973 * Deal with a LSM problem when handling the packet in @skb, typically this is
974 * a permission denied problem (-EACCES). The correct action is determined
975 * according to the packet's labeling protocol.
976 *
977 */
Paul Mooredfaebe92008-10-10 10:16:31 -0400978void netlbl_skbuff_err(struct sk_buff *skb, int error, int gateway)
Paul Moored15c3452006-08-03 16:48:37 -0700979{
980 if (CIPSO_V4_OPTEXIST(skb))
Paul Mooredfaebe92008-10-10 10:16:31 -0400981 cipso_v4_error(skb, error, gateway);
Paul Moored15c3452006-08-03 16:48:37 -0700982}
983
984/**
985 * netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches
986 *
987 * Description:
988 * For all of the NetLabel protocols that support some form of label mapping
989 * cache, invalidate the cache. Returns zero on success, negative values on
990 * error.
991 *
992 */
993void netlbl_cache_invalidate(void)
994{
995 cipso_v4_cache_invalidate();
996}
997
998/**
999 * netlbl_cache_add - Add an entry to a NetLabel protocol cache
1000 * @skb: the packet
1001 * @secattr: the packet's security attributes
1002 *
1003 * Description:
1004 * Add the LSM security attributes for the given packet to the underlying
1005 * NetLabel protocol's label mapping cache. Returns zero on success, negative
1006 * values on error.
1007 *
1008 */
1009int netlbl_cache_add(const struct sk_buff *skb,
1010 const struct netlbl_lsm_secattr *secattr)
1011{
Paul Moore701a90b2006-11-17 17:38:46 -05001012 if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0)
Paul Moored15c3452006-08-03 16:48:37 -07001013 return -ENOMSG;
1014
1015 if (CIPSO_V4_OPTEXIST(skb))
1016 return cipso_v4_cache_add(skb, secattr);
1017
1018 return -ENOMSG;
1019}
1020
1021/*
Paul Moore6c2e8ac2008-12-31 12:54:11 -05001022 * Protocol Engine Functions
1023 */
1024
1025/**
1026 * netlbl_audit_start - Start an audit message
1027 * @type: audit message type
1028 * @audit_info: NetLabel audit information
1029 *
1030 * Description:
1031 * Start an audit message using the type specified in @type and fill the audit
1032 * message with some fields common to all NetLabel audit messages. This
1033 * function should only be used by protocol engines, not LSMs. Returns a
1034 * pointer to the audit buffer on success, NULL on failure.
1035 *
1036 */
1037struct audit_buffer *netlbl_audit_start(int type,
1038 struct netlbl_audit *audit_info)
1039{
1040 return netlbl_audit_start_common(type, audit_info);
1041}
1042
1043/*
Paul Moored15c3452006-08-03 16:48:37 -07001044 * Setup Functions
1045 */
1046
1047/**
1048 * netlbl_init - Initialize NetLabel
1049 *
1050 * Description:
1051 * Perform the required NetLabel initialization before first use.
1052 *
1053 */
1054static int __init netlbl_init(void)
1055{
1056 int ret_val;
1057
1058 printk(KERN_INFO "NetLabel: Initializing\n");
1059 printk(KERN_INFO "NetLabel: domain hash size = %u\n",
1060 (1 << NETLBL_DOMHSH_BITSIZE));
1061 printk(KERN_INFO "NetLabel: protocols ="
1062 " UNLABELED"
1063 " CIPSOv4"
1064 "\n");
1065
1066 ret_val = netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE);
1067 if (ret_val != 0)
1068 goto init_failure;
1069
Paul Moore8cc44572008-01-29 08:44:21 -05001070 ret_val = netlbl_unlabel_init(NETLBL_UNLHSH_BITSIZE);
1071 if (ret_val != 0)
1072 goto init_failure;
1073
Paul Moored15c3452006-08-03 16:48:37 -07001074 ret_val = netlbl_netlink_init();
1075 if (ret_val != 0)
1076 goto init_failure;
1077
1078 ret_val = netlbl_unlabel_defconf();
1079 if (ret_val != 0)
1080 goto init_failure;
1081 printk(KERN_INFO "NetLabel: unlabeled traffic allowed by default\n");
1082
1083 return 0;
1084
1085init_failure:
1086 panic("NetLabel: failed to initialize properly (%d)\n", ret_val);
1087}
1088
1089subsys_initcall(netlbl_init);