blob: 5952237c0c867d14943688e9e592943adc1e8321 [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 Sharma600634972011-07-26 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;
Paul Mooreeda61d32008-02-04 22:29:47 -0800114
115 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
116 if (entry == NULL)
Paul Moore948a7242008-10-10 10:16:30 -0400117 return -ENOMEM;
Paul Mooreeda61d32008-02-04 22:29:47 -0800118 if (domain != NULL) {
119 entry->domain = kstrdup(domain, GFP_ATOMIC);
120 if (entry->domain == NULL)
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500121 goto cfg_unlbl_map_add_failure;
Paul Mooreeda61d32008-02-04 22:29:47 -0800122 }
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500123
124 if (addr == NULL && mask == NULL)
125 entry->type = NETLBL_NLTYPE_UNLABELED;
126 else if (addr != NULL && mask != NULL) {
127 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
128 if (addrmap == NULL)
129 goto cfg_unlbl_map_add_failure;
130 INIT_LIST_HEAD(&addrmap->list4);
131 INIT_LIST_HEAD(&addrmap->list6);
132
133 switch (family) {
Paul Moore1281bc22011-11-29 10:10:54 +0000134 case AF_INET: {
135 const struct in_addr *addr4 = addr;
136 const struct in_addr *mask4 = mask;
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500137 map4 = kzalloc(sizeof(*map4), GFP_ATOMIC);
138 if (map4 == NULL)
139 goto cfg_unlbl_map_add_failure;
140 map4->type = NETLBL_NLTYPE_UNLABELED;
141 map4->list.addr = addr4->s_addr & mask4->s_addr;
142 map4->list.mask = mask4->s_addr;
143 map4->list.valid = 1;
144 ret_val = netlbl_af4list_add(&map4->list,
145 &addrmap->list4);
146 if (ret_val != 0)
147 goto cfg_unlbl_map_add_failure;
148 break;
Paul Moore1281bc22011-11-29 10:10:54 +0000149 }
150#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
151 case AF_INET6: {
152 const struct in6_addr *addr6 = addr;
153 const struct in6_addr *mask6 = mask;
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500154 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;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000158 map6->list.addr = *addr6;
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500159 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];
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000163 map6->list.mask = *mask6;
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500164 map6->list.valid = 1;
Dan Carpenter42ca0202011-11-23 21:18:20 +0000165 ret_val = netlbl_af6list_add(&map6->list,
166 &addrmap->list6);
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500167 if (ret_val != 0)
168 goto cfg_unlbl_map_add_failure;
169 break;
Paul Moore1281bc22011-11-29 10:10:54 +0000170 }
171#endif /* IPv6 */
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500172 default:
173 goto cfg_unlbl_map_add_failure;
174 break;
175 }
176
177 entry->type_def.addrsel = addrmap;
178 entry->type = NETLBL_NLTYPE_ADDRSELECT;
179 } else {
180 ret_val = -EINVAL;
181 goto cfg_unlbl_map_add_failure;
182 }
Paul Mooreeda61d32008-02-04 22:29:47 -0800183
184 ret_val = netlbl_domhsh_add(entry, audit_info);
185 if (ret_val != 0)
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500186 goto cfg_unlbl_map_add_failure;
Paul Mooreeda61d32008-02-04 22:29:47 -0800187
188 return 0;
189
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500190cfg_unlbl_map_add_failure:
Julia Lawall47943232009-07-27 06:15:43 +0000191 kfree(entry->domain);
Paul Mooreeda61d32008-02-04 22:29:47 -0800192 kfree(entry);
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500193 kfree(addrmap);
194 kfree(map4);
195 kfree(map6);
Paul Mooreeda61d32008-02-04 22:29:47 -0800196 return ret_val;
197}
198
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500199
Paul Mooreeda61d32008-02-04 22:29:47 -0800200/**
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500201 * netlbl_cfg_unlbl_static_add - Adds a new static label
202 * @net: network namespace
203 * @dev_name: interface name
204 * @addr: IP address in network byte order (struct in[6]_addr)
205 * @mask: address mask in network byte order (struct in[6]_addr)
206 * @family: address family
207 * @secid: LSM secid value for the entry
Paul Mooreeda61d32008-02-04 22:29:47 -0800208 * @audit_info: NetLabel audit information
209 *
210 * Description:
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500211 * Adds a new NetLabel static label to be used when protocol provided labels
212 * are not present on incoming traffic. If @dev_name is NULL then the default
213 * interface will be used. Returns zero on success, negative values on failure.
Paul Mooreeda61d32008-02-04 22:29:47 -0800214 *
215 */
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500216int netlbl_cfg_unlbl_static_add(struct net *net,
217 const char *dev_name,
218 const void *addr,
219 const void *mask,
220 u16 family,
221 u32 secid,
222 struct netlbl_audit *audit_info)
223{
224 u32 addr_len;
225
226 switch (family) {
227 case AF_INET:
228 addr_len = sizeof(struct in_addr);
229 break;
Paul Moore1281bc22011-11-29 10:10:54 +0000230#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500231 case AF_INET6:
232 addr_len = sizeof(struct in6_addr);
233 break;
Paul Moore1281bc22011-11-29 10:10:54 +0000234#endif /* IPv6 */
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500235 default:
236 return -EPFNOSUPPORT;
237 }
238
239 return netlbl_unlhsh_add(net,
240 dev_name, addr, mask, addr_len,
241 secid, audit_info);
242}
243
244/**
245 * netlbl_cfg_unlbl_static_del - Removes an existing static label
246 * @net: network namespace
247 * @dev_name: interface name
248 * @addr: IP address in network byte order (struct in[6]_addr)
249 * @mask: address mask in network byte order (struct in[6]_addr)
250 * @family: address family
251 * @secid: LSM secid value for the entry
252 * @audit_info: NetLabel audit information
253 *
254 * Description:
255 * Removes an existing NetLabel static label used when protocol provided labels
256 * are not present on incoming traffic. If @dev_name is NULL then the default
257 * interface will be used. Returns zero on success, negative values on failure.
258 *
259 */
260int netlbl_cfg_unlbl_static_del(struct net *net,
261 const char *dev_name,
262 const void *addr,
263 const void *mask,
264 u16 family,
265 struct netlbl_audit *audit_info)
266{
267 u32 addr_len;
268
269 switch (family) {
270 case AF_INET:
271 addr_len = sizeof(struct in_addr);
272 break;
Paul Moore1281bc22011-11-29 10:10:54 +0000273#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500274 case AF_INET6:
275 addr_len = sizeof(struct in6_addr);
276 break;
Paul Moore1281bc22011-11-29 10:10:54 +0000277#endif /* IPv6 */
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500278 default:
279 return -EPFNOSUPPORT;
280 }
281
282 return netlbl_unlhsh_remove(net,
283 dev_name, addr, mask, addr_len,
284 audit_info);
285}
286
287/**
288 * netlbl_cfg_cipsov4_add - Add a new CIPSOv4 DOI definition
289 * @doi_def: CIPSO DOI definition
290 * @audit_info: NetLabel audit information
291 *
292 * Description:
293 * Add a new CIPSO DOI definition as defined by @doi_def. Returns zero on
294 * success and negative values on failure.
295 *
296 */
297int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def,
298 struct netlbl_audit *audit_info)
299{
300 return cipso_v4_doi_add(doi_def, audit_info);
301}
302
303/**
304 * netlbl_cfg_cipsov4_del - Remove an existing CIPSOv4 DOI definition
305 * @doi: CIPSO DOI
306 * @audit_info: NetLabel audit information
307 *
308 * Description:
309 * Remove an existing CIPSO DOI definition matching @doi. Returns zero on
310 * success and negative values on failure.
311 *
312 */
313void netlbl_cfg_cipsov4_del(u32 doi, struct netlbl_audit *audit_info)
314{
315 cipso_v4_doi_remove(doi, audit_info);
316}
317
318/**
319 * netlbl_cfg_cipsov4_map_add - Add a new CIPSOv4 DOI mapping
320 * @doi: the CIPSO DOI
321 * @domain: the domain mapping to add
322 * @addr: IP address
323 * @mask: IP address mask
324 * @audit_info: NetLabel audit information
325 *
326 * Description:
327 * Add a new NetLabel/LSM domain mapping for the given CIPSO DOI to the NetLabel
328 * subsystem. A @domain value of NULL adds a new default domain mapping.
329 * Returns zero on success, negative values on failure.
330 *
331 */
332int netlbl_cfg_cipsov4_map_add(u32 doi,
Paul Mooreeda61d32008-02-04 22:29:47 -0800333 const char *domain,
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500334 const struct in_addr *addr,
335 const struct in_addr *mask,
Paul Mooreeda61d32008-02-04 22:29:47 -0800336 struct netlbl_audit *audit_info)
337{
338 int ret_val = -ENOMEM;
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500339 struct cipso_v4_doi *doi_def;
Paul Mooreeda61d32008-02-04 22:29:47 -0800340 struct netlbl_dom_map *entry;
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500341 struct netlbl_domaddr_map *addrmap = NULL;
342 struct netlbl_domaddr4_map *addrinfo = NULL;
Paul Mooreeda61d32008-02-04 22:29:47 -0800343
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500344 doi_def = cipso_v4_doi_getdef(doi);
345 if (doi_def == NULL)
346 return -ENOENT;
Paul Mooreb1edeb12008-10-10 10:16:31 -0400347
Paul Mooreeda61d32008-02-04 22:29:47 -0800348 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
349 if (entry == NULL)
Julia Lawall94a80d62011-08-11 00:06:04 +0000350 goto out_entry;
Paul Mooreeda61d32008-02-04 22:29:47 -0800351 if (domain != NULL) {
352 entry->domain = kstrdup(domain, GFP_ATOMIC);
353 if (entry->domain == NULL)
Julia Lawall94a80d62011-08-11 00:06:04 +0000354 goto out_domain;
Paul Mooreeda61d32008-02-04 22:29:47 -0800355 }
Paul Mooreeda61d32008-02-04 22:29:47 -0800356
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500357 if (addr == NULL && mask == NULL) {
358 entry->type_def.cipsov4 = doi_def;
359 entry->type = NETLBL_NLTYPE_CIPSOV4;
360 } else if (addr != NULL && mask != NULL) {
361 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
362 if (addrmap == NULL)
Julia Lawall94a80d62011-08-11 00:06:04 +0000363 goto out_addrmap;
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500364 INIT_LIST_HEAD(&addrmap->list4);
365 INIT_LIST_HEAD(&addrmap->list6);
366
367 addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC);
368 if (addrinfo == NULL)
Julia Lawall94a80d62011-08-11 00:06:04 +0000369 goto out_addrinfo;
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500370 addrinfo->type_def.cipsov4 = doi_def;
371 addrinfo->type = NETLBL_NLTYPE_CIPSOV4;
372 addrinfo->list.addr = addr->s_addr & mask->s_addr;
373 addrinfo->list.mask = mask->s_addr;
374 addrinfo->list.valid = 1;
375 ret_val = netlbl_af4list_add(&addrinfo->list, &addrmap->list4);
376 if (ret_val != 0)
377 goto cfg_cipsov4_map_add_failure;
378
379 entry->type_def.addrsel = addrmap;
380 entry->type = NETLBL_NLTYPE_ADDRSELECT;
381 } else {
382 ret_val = -EINVAL;
Julia Lawall94a80d62011-08-11 00:06:04 +0000383 goto out_addrmap;
Paul Mooreb1edeb12008-10-10 10:16:31 -0400384 }
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500385
Paul Mooreeda61d32008-02-04 22:29:47 -0800386 ret_val = netlbl_domhsh_add(entry, audit_info);
387 if (ret_val != 0)
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500388 goto cfg_cipsov4_map_add_failure;
Paul Mooreeda61d32008-02-04 22:29:47 -0800389
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500390 return 0;
Paul Mooreb1edeb12008-10-10 10:16:31 -0400391
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500392cfg_cipsov4_map_add_failure:
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500393 kfree(addrinfo);
Julia Lawall94a80d62011-08-11 00:06:04 +0000394out_addrinfo:
395 kfree(addrmap);
396out_addrmap:
397 kfree(entry->domain);
398out_domain:
399 kfree(entry);
400out_entry:
401 cipso_v4_doi_putdef(doi_def);
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500402 return ret_val;
Paul Mooreeda61d32008-02-04 22:29:47 -0800403}
404
Paul Mooreeda61d32008-02-04 22:29:47 -0800405/*
Paul Moore02752762006-11-29 13:18:18 -0500406 * Security Attribute Functions
407 */
408
409/**
410 * netlbl_secattr_catmap_walk - Walk a LSM secattr catmap looking for a bit
411 * @catmap: the category bitmap
412 * @offset: the offset to start searching at, in bits
413 *
414 * Description:
415 * This function walks a LSM secattr category bitmap starting at @offset and
416 * returns the spot of the first set bit or -ENOENT if no bits are set.
417 *
418 */
419int netlbl_secattr_catmap_walk(struct netlbl_lsm_secattr_catmap *catmap,
420 u32 offset)
421{
422 struct netlbl_lsm_secattr_catmap *iter = catmap;
423 u32 node_idx;
424 u32 node_bit;
425 NETLBL_CATMAP_MAPTYPE bitmap;
426
427 if (offset > iter->startbit) {
428 while (offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
429 iter = iter->next;
430 if (iter == NULL)
431 return -ENOENT;
432 }
433 node_idx = (offset - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
434 node_bit = offset - iter->startbit -
435 (NETLBL_CATMAP_MAPSIZE * node_idx);
436 } else {
437 node_idx = 0;
438 node_bit = 0;
439 }
440 bitmap = iter->bitmap[node_idx] >> node_bit;
441
442 for (;;) {
443 if (bitmap != 0) {
444 while ((bitmap & NETLBL_CATMAP_BIT) == 0) {
445 bitmap >>= 1;
446 node_bit++;
447 }
448 return iter->startbit +
449 (NETLBL_CATMAP_MAPSIZE * node_idx) + node_bit;
450 }
451 if (++node_idx >= NETLBL_CATMAP_MAPCNT) {
452 if (iter->next != NULL) {
453 iter = iter->next;
454 node_idx = 0;
455 } else
456 return -ENOENT;
457 }
458 bitmap = iter->bitmap[node_idx];
459 node_bit = 0;
460 }
461
462 return -ENOENT;
463}
464
465/**
466 * netlbl_secattr_catmap_walk_rng - Find the end of a string of set bits
467 * @catmap: the category bitmap
468 * @offset: the offset to start searching at, in bits
469 *
470 * Description:
471 * This function walks a LSM secattr category bitmap starting at @offset and
472 * returns the spot of the first cleared bit or -ENOENT if the offset is past
473 * the end of the bitmap.
474 *
475 */
476int netlbl_secattr_catmap_walk_rng(struct netlbl_lsm_secattr_catmap *catmap,
477 u32 offset)
478{
479 struct netlbl_lsm_secattr_catmap *iter = catmap;
480 u32 node_idx;
481 u32 node_bit;
482 NETLBL_CATMAP_MAPTYPE bitmask;
483 NETLBL_CATMAP_MAPTYPE bitmap;
484
485 if (offset > iter->startbit) {
486 while (offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
487 iter = iter->next;
488 if (iter == NULL)
489 return -ENOENT;
490 }
491 node_idx = (offset - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
492 node_bit = offset - iter->startbit -
493 (NETLBL_CATMAP_MAPSIZE * node_idx);
494 } else {
495 node_idx = 0;
496 node_bit = 0;
497 }
498 bitmask = NETLBL_CATMAP_BIT << node_bit;
499
500 for (;;) {
501 bitmap = iter->bitmap[node_idx];
502 while (bitmask != 0 && (bitmap & bitmask) != 0) {
503 bitmask <<= 1;
504 node_bit++;
505 }
506
507 if (bitmask != 0)
508 return iter->startbit +
509 (NETLBL_CATMAP_MAPSIZE * node_idx) +
510 node_bit - 1;
511 else if (++node_idx >= NETLBL_CATMAP_MAPCNT) {
512 if (iter->next == NULL)
513 return iter->startbit + NETLBL_CATMAP_SIZE - 1;
514 iter = iter->next;
515 node_idx = 0;
516 }
517 bitmask = NETLBL_CATMAP_BIT;
518 node_bit = 0;
519 }
520
521 return -ENOENT;
522}
523
524/**
525 * netlbl_secattr_catmap_setbit - Set a bit in a LSM secattr catmap
526 * @catmap: the category bitmap
527 * @bit: the bit to set
528 * @flags: memory allocation flags
529 *
530 * Description:
531 * Set the bit specified by @bit in @catmap. Returns zero on success,
532 * negative values on failure.
533 *
534 */
535int netlbl_secattr_catmap_setbit(struct netlbl_lsm_secattr_catmap *catmap,
536 u32 bit,
537 gfp_t flags)
538{
539 struct netlbl_lsm_secattr_catmap *iter = catmap;
540 u32 node_bit;
541 u32 node_idx;
542
543 while (iter->next != NULL &&
544 bit >= (iter->startbit + NETLBL_CATMAP_SIZE))
545 iter = iter->next;
546 if (bit >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
547 iter->next = netlbl_secattr_catmap_alloc(flags);
548 if (iter->next == NULL)
549 return -ENOMEM;
550 iter = iter->next;
551 iter->startbit = bit & ~(NETLBL_CATMAP_SIZE - 1);
552 }
553
554 /* gcc always rounds to zero when doing integer division */
555 node_idx = (bit - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
556 node_bit = bit - iter->startbit - (NETLBL_CATMAP_MAPSIZE * node_idx);
557 iter->bitmap[node_idx] |= NETLBL_CATMAP_BIT << node_bit;
558
559 return 0;
560}
561
562/**
563 * netlbl_secattr_catmap_setrng - Set a range of bits in a LSM secattr catmap
564 * @catmap: the category bitmap
565 * @start: the starting bit
566 * @end: the last bit in the string
567 * @flags: memory allocation flags
568 *
569 * Description:
570 * Set a range of bits, starting at @start and ending with @end. Returns zero
571 * on success, negative values on failure.
572 *
573 */
574int netlbl_secattr_catmap_setrng(struct netlbl_lsm_secattr_catmap *catmap,
575 u32 start,
576 u32 end,
577 gfp_t flags)
578{
579 int ret_val = 0;
580 struct netlbl_lsm_secattr_catmap *iter = catmap;
581 u32 iter_max_spot;
582 u32 spot;
583
584 /* XXX - This could probably be made a bit faster by combining writes
585 * to the catmap instead of setting a single bit each time, but for
586 * right now skipping to the start of the range in the catmap should
587 * be a nice improvement over calling the individual setbit function
588 * repeatedly from a loop. */
589
590 while (iter->next != NULL &&
591 start >= (iter->startbit + NETLBL_CATMAP_SIZE))
592 iter = iter->next;
593 iter_max_spot = iter->startbit + NETLBL_CATMAP_SIZE;
594
595 for (spot = start; spot <= end && ret_val == 0; spot++) {
596 if (spot >= iter_max_spot && iter->next != NULL) {
597 iter = iter->next;
598 iter_max_spot = iter->startbit + NETLBL_CATMAP_SIZE;
599 }
600 ret_val = netlbl_secattr_catmap_setbit(iter, spot, GFP_ATOMIC);
601 }
602
603 return ret_val;
604}
605
606/*
Paul Moored15c3452006-08-03 16:48:37 -0700607 * LSM Functions
608 */
609
610/**
Paul Moore23bcdc12007-07-18 12:28:45 -0400611 * netlbl_enabled - Determine if the NetLabel subsystem is enabled
612 *
613 * Description:
614 * The LSM can use this function to determine if it should use NetLabel
615 * security attributes in it's enforcement mechanism. Currently, NetLabel is
616 * considered to be enabled when it's configuration contains a valid setup for
617 * at least one labeled protocol (i.e. NetLabel can understand incoming
618 * labeled packets of at least one type); otherwise NetLabel is considered to
619 * be disabled.
620 *
621 */
622int netlbl_enabled(void)
623{
624 /* At some point we probably want to expose this mechanism to the user
625 * as well so that admins can toggle NetLabel regardless of the
626 * configuration */
Paul Moorec783f1c2008-01-29 08:37:52 -0500627 return (atomic_read(&netlabel_mgmt_protocount) > 0);
Paul Moore23bcdc12007-07-18 12:28:45 -0400628}
629
630/**
Paul Moore389fb8002009-03-27 17:10:34 -0400631 * netlbl_sock_setattr - Label a socket using the correct protocol
Paul Mooreba6ff9f2007-06-07 18:37:15 -0700632 * @sk: the socket to label
Paul Moore389fb8002009-03-27 17:10:34 -0400633 * @family: protocol family
Paul Moored15c3452006-08-03 16:48:37 -0700634 * @secattr: the security attributes
635 *
636 * Description:
637 * Attach the correct label to the given socket using the security attributes
Paul Mooreba6ff9f2007-06-07 18:37:15 -0700638 * specified in @secattr. This function requires exclusive access to @sk,
639 * which means it either needs to be in the process of being created or locked.
Paul Moore63c41682008-10-10 10:16:32 -0400640 * Returns zero on success, -EDESTADDRREQ if the domain is configured to use
641 * network address selectors (can't blindly label the socket), and negative
642 * values on all other failures.
Paul Moored15c3452006-08-03 16:48:37 -0700643 *
644 */
Paul Mooreba6ff9f2007-06-07 18:37:15 -0700645int netlbl_sock_setattr(struct sock *sk,
Paul Moore389fb8002009-03-27 17:10:34 -0400646 u16 family,
Paul Mooreba6ff9f2007-06-07 18:37:15 -0700647 const struct netlbl_lsm_secattr *secattr)
Paul Moored15c3452006-08-03 16:48:37 -0700648{
Paul Moore389fb8002009-03-27 17:10:34 -0400649 int ret_val;
Paul Moored15c3452006-08-03 16:48:37 -0700650 struct netlbl_dom_map *dom_entry;
651
652 rcu_read_lock();
653 dom_entry = netlbl_domhsh_getentry(secattr->domain);
Paul Moore389fb8002009-03-27 17:10:34 -0400654 if (dom_entry == NULL) {
655 ret_val = -ENOENT;
Paul Moored15c3452006-08-03 16:48:37 -0700656 goto socket_setattr_return;
Paul Moore389fb8002009-03-27 17:10:34 -0400657 }
658 switch (family) {
659 case AF_INET:
660 switch (dom_entry->type) {
661 case NETLBL_NLTYPE_ADDRSELECT:
662 ret_val = -EDESTADDRREQ;
663 break;
664 case NETLBL_NLTYPE_CIPSOV4:
665 ret_val = cipso_v4_sock_setattr(sk,
666 dom_entry->type_def.cipsov4,
667 secattr);
668 break;
669 case NETLBL_NLTYPE_UNLABELED:
670 ret_val = 0;
671 break;
672 default:
673 ret_val = -ENOENT;
674 }
Paul Moore63c41682008-10-10 10:16:32 -0400675 break;
Paul Moore389fb8002009-03-27 17:10:34 -0400676#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
677 case AF_INET6:
678 /* since we don't support any IPv6 labeling protocols right
679 * now we can optimize everything away until we do */
Paul Moored15c3452006-08-03 16:48:37 -0700680 ret_val = 0;
681 break;
Paul Moore389fb8002009-03-27 17:10:34 -0400682#endif /* IPv6 */
Paul Moored15c3452006-08-03 16:48:37 -0700683 default:
Paul Moore389fb8002009-03-27 17:10:34 -0400684 ret_val = -EPROTONOSUPPORT;
Paul Moored15c3452006-08-03 16:48:37 -0700685 }
686
687socket_setattr_return:
688 rcu_read_unlock();
689 return ret_val;
690}
691
692/**
Paul Moore014ab192008-10-10 10:16:33 -0400693 * netlbl_sock_delattr - Delete all the NetLabel labels on a socket
694 * @sk: the socket
695 *
696 * Description:
697 * Remove all the NetLabel labeling from @sk. The caller is responsible for
698 * ensuring that @sk is locked.
699 *
700 */
701void netlbl_sock_delattr(struct sock *sk)
702{
703 cipso_v4_sock_delattr(sk);
704}
705
706/**
Paul Moore14a72f52006-09-25 15:52:01 -0700707 * netlbl_sock_getattr - Determine the security attributes of a sock
708 * @sk: the sock
709 * @secattr: the security attributes
710 *
711 * Description:
Paul Moore8cc44572008-01-29 08:44:21 -0500712 * Examines the given sock to see if any NetLabel style labeling has been
Paul Moore14a72f52006-09-25 15:52:01 -0700713 * applied to the sock, if so it parses the socket label and returns the
714 * security attributes in @secattr. Returns zero on success, negative values
715 * on failure.
716 *
717 */
Paul Moore389fb8002009-03-27 17:10:34 -0400718int netlbl_sock_getattr(struct sock *sk,
719 struct netlbl_lsm_secattr *secattr)
Paul Moore14a72f52006-09-25 15:52:01 -0700720{
Paul Moore389fb8002009-03-27 17:10:34 -0400721 int ret_val;
722
723 switch (sk->sk_family) {
724 case AF_INET:
725 ret_val = cipso_v4_sock_getattr(sk, secattr);
726 break;
727#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
728 case AF_INET6:
729 ret_val = -ENOMSG;
730 break;
731#endif /* IPv6 */
732 default:
733 ret_val = -EPROTONOSUPPORT;
734 }
735
736 return ret_val;
Paul Moore14a72f52006-09-25 15:52:01 -0700737}
738
739/**
Paul Moore014ab192008-10-10 10:16:33 -0400740 * netlbl_conn_setattr - Label a connected socket using the correct protocol
741 * @sk: the socket to label
742 * @addr: the destination address
743 * @secattr: the security attributes
744 *
745 * Description:
746 * Attach the correct label to the given connected socket using the security
747 * attributes specified in @secattr. The caller is responsible for ensuring
748 * that @sk is locked. Returns zero on success, negative values on failure.
749 *
750 */
751int netlbl_conn_setattr(struct sock *sk,
752 struct sockaddr *addr,
753 const struct netlbl_lsm_secattr *secattr)
754{
755 int ret_val;
756 struct sockaddr_in *addr4;
757 struct netlbl_domaddr4_map *af4_entry;
758
759 rcu_read_lock();
760 switch (addr->sa_family) {
761 case AF_INET:
762 addr4 = (struct sockaddr_in *)addr;
763 af4_entry = netlbl_domhsh_getentry_af4(secattr->domain,
764 addr4->sin_addr.s_addr);
765 if (af4_entry == NULL) {
766 ret_val = -ENOENT;
767 goto conn_setattr_return;
768 }
769 switch (af4_entry->type) {
770 case NETLBL_NLTYPE_CIPSOV4:
771 ret_val = cipso_v4_sock_setattr(sk,
772 af4_entry->type_def.cipsov4,
773 secattr);
774 break;
775 case NETLBL_NLTYPE_UNLABELED:
776 /* just delete the protocols we support for right now
777 * but we could remove other protocols if needed */
778 cipso_v4_sock_delattr(sk);
779 ret_val = 0;
780 break;
781 default:
782 ret_val = -ENOENT;
783 }
784 break;
785#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
786 case AF_INET6:
787 /* since we don't support any IPv6 labeling protocols right
788 * now we can optimize everything away until we do */
789 ret_val = 0;
790 break;
791#endif /* IPv6 */
792 default:
Paul Moore389fb8002009-03-27 17:10:34 -0400793 ret_val = -EPROTONOSUPPORT;
Paul Moore014ab192008-10-10 10:16:33 -0400794 }
795
796conn_setattr_return:
797 rcu_read_unlock();
798 return ret_val;
799}
800
801/**
Paul Moore389fb8002009-03-27 17:10:34 -0400802 * netlbl_req_setattr - Label a request socket using the correct protocol
803 * @req: the request socket to label
804 * @secattr: the security attributes
805 *
806 * Description:
807 * Attach the correct label to the given socket using the security attributes
808 * specified in @secattr. Returns zero on success, negative values on failure.
809 *
810 */
811int netlbl_req_setattr(struct request_sock *req,
812 const struct netlbl_lsm_secattr *secattr)
813{
814 int ret_val;
815 struct netlbl_dom_map *dom_entry;
816 struct netlbl_domaddr4_map *af4_entry;
817 u32 proto_type;
818 struct cipso_v4_doi *proto_cv4;
819
820 rcu_read_lock();
821 dom_entry = netlbl_domhsh_getentry(secattr->domain);
822 if (dom_entry == NULL) {
823 ret_val = -ENOENT;
824 goto req_setattr_return;
825 }
826 switch (req->rsk_ops->family) {
827 case AF_INET:
828 if (dom_entry->type == NETLBL_NLTYPE_ADDRSELECT) {
829 struct inet_request_sock *req_inet = inet_rsk(req);
830 af4_entry = netlbl_domhsh_getentry_af4(secattr->domain,
831 req_inet->rmt_addr);
832 if (af4_entry == NULL) {
833 ret_val = -ENOENT;
834 goto req_setattr_return;
835 }
836 proto_type = af4_entry->type;
837 proto_cv4 = af4_entry->type_def.cipsov4;
838 } else {
839 proto_type = dom_entry->type;
840 proto_cv4 = dom_entry->type_def.cipsov4;
841 }
842 switch (proto_type) {
843 case NETLBL_NLTYPE_CIPSOV4:
844 ret_val = cipso_v4_req_setattr(req, proto_cv4, secattr);
845 break;
846 case NETLBL_NLTYPE_UNLABELED:
847 /* just delete the protocols we support for right now
848 * but we could remove other protocols if needed */
849 cipso_v4_req_delattr(req);
850 ret_val = 0;
851 break;
852 default:
853 ret_val = -ENOENT;
854 }
855 break;
856#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
857 case AF_INET6:
858 /* since we don't support any IPv6 labeling protocols right
859 * now we can optimize everything away until we do */
860 ret_val = 0;
861 break;
862#endif /* IPv6 */
863 default:
864 ret_val = -EPROTONOSUPPORT;
865 }
866
867req_setattr_return:
868 rcu_read_unlock();
869 return ret_val;
870}
871
872/**
Paul Moore07feee82009-03-27 17:10:54 -0400873* netlbl_req_delattr - Delete all the NetLabel labels on a socket
874* @req: the socket
875*
876* Description:
877* Remove all the NetLabel labeling from @req.
878*
879*/
880void netlbl_req_delattr(struct request_sock *req)
881{
882 cipso_v4_req_delattr(req);
883}
884
885/**
Paul Moore948bf852008-10-10 10:16:32 -0400886 * netlbl_skbuff_setattr - Label a packet using the correct protocol
887 * @skb: the packet
888 * @family: protocol family
889 * @secattr: the security attributes
890 *
891 * Description:
892 * Attach the correct label to the given packet using the security attributes
893 * specified in @secattr. Returns zero on success, negative values on failure.
894 *
895 */
896int netlbl_skbuff_setattr(struct sk_buff *skb,
897 u16 family,
898 const struct netlbl_lsm_secattr *secattr)
899{
900 int ret_val;
901 struct iphdr *hdr4;
902 struct netlbl_domaddr4_map *af4_entry;
903
904 rcu_read_lock();
905 switch (family) {
906 case AF_INET:
907 hdr4 = ip_hdr(skb);
908 af4_entry = netlbl_domhsh_getentry_af4(secattr->domain,
909 hdr4->daddr);
910 if (af4_entry == NULL) {
911 ret_val = -ENOENT;
912 goto skbuff_setattr_return;
913 }
914 switch (af4_entry->type) {
915 case NETLBL_NLTYPE_CIPSOV4:
916 ret_val = cipso_v4_skbuff_setattr(skb,
917 af4_entry->type_def.cipsov4,
918 secattr);
919 break;
920 case NETLBL_NLTYPE_UNLABELED:
921 /* just delete the protocols we support for right now
922 * but we could remove other protocols if needed */
923 ret_val = cipso_v4_skbuff_delattr(skb);
924 break;
925 default:
926 ret_val = -ENOENT;
927 }
928 break;
929#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
930 case AF_INET6:
931 /* since we don't support any IPv6 labeling protocols right
932 * now we can optimize everything away until we do */
933 ret_val = 0;
934 break;
935#endif /* IPv6 */
936 default:
Paul Moore389fb8002009-03-27 17:10:34 -0400937 ret_val = -EPROTONOSUPPORT;
Paul Moore948bf852008-10-10 10:16:32 -0400938 }
939
940skbuff_setattr_return:
941 rcu_read_unlock();
942 return ret_val;
943}
944
945/**
Paul Moored15c3452006-08-03 16:48:37 -0700946 * netlbl_skbuff_getattr - Determine the security attributes of a packet
947 * @skb: the packet
Paul Moore75e22912008-01-29 08:38:04 -0500948 * @family: protocol family
Paul Moored15c3452006-08-03 16:48:37 -0700949 * @secattr: the security attributes
950 *
951 * Description:
952 * Examines the given packet to see if a recognized form of packet labeling
953 * is present, if so it parses the packet label and returns the security
954 * attributes in @secattr. Returns zero on success, negative values on
955 * failure.
956 *
957 */
958int netlbl_skbuff_getattr(const struct sk_buff *skb,
Paul Moore75e22912008-01-29 08:38:04 -0500959 u16 family,
Paul Moored15c3452006-08-03 16:48:37 -0700960 struct netlbl_lsm_secattr *secattr)
961{
Paul Moore389fb8002009-03-27 17:10:34 -0400962 switch (family) {
963 case AF_INET:
964 if (CIPSO_V4_OPTEXIST(skb) &&
965 cipso_v4_skbuff_getattr(skb, secattr) == 0)
966 return 0;
967 break;
968#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
969 case AF_INET6:
970 break;
971#endif /* IPv6 */
972 }
Paul Moored15c3452006-08-03 16:48:37 -0700973
Paul Moore8cc44572008-01-29 08:44:21 -0500974 return netlbl_unlabel_getattr(skb, family, secattr);
Paul Moored15c3452006-08-03 16:48:37 -0700975}
976
977/**
978 * netlbl_skbuff_err - Handle a LSM error on a sk_buff
979 * @skb: the packet
980 * @error: the error code
Paul Mooredfaebe92008-10-10 10:16:31 -0400981 * @gateway: true if host is acting as a gateway, false otherwise
Paul Moored15c3452006-08-03 16:48:37 -0700982 *
983 * Description:
984 * Deal with a LSM problem when handling the packet in @skb, typically this is
985 * a permission denied problem (-EACCES). The correct action is determined
986 * according to the packet's labeling protocol.
987 *
988 */
Paul Mooredfaebe92008-10-10 10:16:31 -0400989void netlbl_skbuff_err(struct sk_buff *skb, int error, int gateway)
Paul Moored15c3452006-08-03 16:48:37 -0700990{
991 if (CIPSO_V4_OPTEXIST(skb))
Paul Mooredfaebe92008-10-10 10:16:31 -0400992 cipso_v4_error(skb, error, gateway);
Paul Moored15c3452006-08-03 16:48:37 -0700993}
994
995/**
996 * netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches
997 *
998 * Description:
999 * For all of the NetLabel protocols that support some form of label mapping
1000 * cache, invalidate the cache. Returns zero on success, negative values on
1001 * error.
1002 *
1003 */
1004void netlbl_cache_invalidate(void)
1005{
1006 cipso_v4_cache_invalidate();
1007}
1008
1009/**
1010 * netlbl_cache_add - Add an entry to a NetLabel protocol cache
1011 * @skb: the packet
1012 * @secattr: the packet's security attributes
1013 *
1014 * Description:
1015 * Add the LSM security attributes for the given packet to the underlying
1016 * NetLabel protocol's label mapping cache. Returns zero on success, negative
1017 * values on error.
1018 *
1019 */
1020int netlbl_cache_add(const struct sk_buff *skb,
1021 const struct netlbl_lsm_secattr *secattr)
1022{
Paul Moore701a90b2006-11-17 17:38:46 -05001023 if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0)
Paul Moored15c3452006-08-03 16:48:37 -07001024 return -ENOMSG;
1025
1026 if (CIPSO_V4_OPTEXIST(skb))
1027 return cipso_v4_cache_add(skb, secattr);
1028
1029 return -ENOMSG;
1030}
1031
1032/*
Paul Moore6c2e8ac2008-12-31 12:54:11 -05001033 * Protocol Engine Functions
1034 */
1035
1036/**
1037 * netlbl_audit_start - Start an audit message
1038 * @type: audit message type
1039 * @audit_info: NetLabel audit information
1040 *
1041 * Description:
1042 * Start an audit message using the type specified in @type and fill the audit
1043 * message with some fields common to all NetLabel audit messages. This
1044 * function should only be used by protocol engines, not LSMs. Returns a
1045 * pointer to the audit buffer on success, NULL on failure.
1046 *
1047 */
1048struct audit_buffer *netlbl_audit_start(int type,
1049 struct netlbl_audit *audit_info)
1050{
1051 return netlbl_audit_start_common(type, audit_info);
1052}
1053
1054/*
Paul Moored15c3452006-08-03 16:48:37 -07001055 * Setup Functions
1056 */
1057
1058/**
1059 * netlbl_init - Initialize NetLabel
1060 *
1061 * Description:
1062 * Perform the required NetLabel initialization before first use.
1063 *
1064 */
1065static int __init netlbl_init(void)
1066{
1067 int ret_val;
1068
1069 printk(KERN_INFO "NetLabel: Initializing\n");
1070 printk(KERN_INFO "NetLabel: domain hash size = %u\n",
1071 (1 << NETLBL_DOMHSH_BITSIZE));
1072 printk(KERN_INFO "NetLabel: protocols ="
1073 " UNLABELED"
1074 " CIPSOv4"
1075 "\n");
1076
1077 ret_val = netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE);
1078 if (ret_val != 0)
1079 goto init_failure;
1080
Paul Moore8cc44572008-01-29 08:44:21 -05001081 ret_val = netlbl_unlabel_init(NETLBL_UNLHSH_BITSIZE);
1082 if (ret_val != 0)
1083 goto init_failure;
1084
Paul Moored15c3452006-08-03 16:48:37 -07001085 ret_val = netlbl_netlink_init();
1086 if (ret_val != 0)
1087 goto init_failure;
1088
1089 ret_val = netlbl_unlabel_defconf();
1090 if (ret_val != 0)
1091 goto init_failure;
1092 printk(KERN_INFO "NetLabel: unlabeled traffic allowed by default\n");
1093
1094 return 0;
1095
1096init_failure:
1097 panic("NetLabel: failed to initialize properly (%d)\n", ret_val);
1098}
1099
1100subsys_initcall(netlbl_init);