blob: 28cddc85b7005aa6b6afa7b2c22f8f88a5b7fa46 [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
Jeff Kirsherd484ff12013-12-06 09:13:41 -080026 * along with this program; if not, see <http://www.gnu.org/licenses/>.
Paul Moored15c3452006-08-03 16:48:37 -070027 *
28 */
29
30#include <linux/init.h>
31#include <linux/types.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090032#include <linux/slab.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>
Arun Sharma600634972011-07-26 16:09:06 -070041#include <linux/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;
Paul Mooreeda61d32008-02-04 22:29:47 -0800113
114 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
115 if (entry == NULL)
Paul Moore948a7242008-10-10 10:16:30 -0400116 return -ENOMEM;
Paul Mooreeda61d32008-02-04 22:29:47 -0800117 if (domain != NULL) {
118 entry->domain = kstrdup(domain, GFP_ATOMIC);
119 if (entry->domain == NULL)
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500120 goto cfg_unlbl_map_add_failure;
Paul Mooreeda61d32008-02-04 22:29:47 -0800121 }
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500122
123 if (addr == NULL && mask == NULL)
Paul Moore6a8b7f02013-08-02 14:45:08 -0400124 entry->def.type = NETLBL_NLTYPE_UNLABELED;
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500125 else if (addr != NULL && mask != NULL) {
126 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
127 if (addrmap == NULL)
128 goto cfg_unlbl_map_add_failure;
129 INIT_LIST_HEAD(&addrmap->list4);
130 INIT_LIST_HEAD(&addrmap->list6);
131
132 switch (family) {
Paul Moore1281bc22011-11-29 10:10:54 +0000133 case AF_INET: {
134 const struct in_addr *addr4 = addr;
135 const struct in_addr *mask4 = mask;
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500136 map4 = kzalloc(sizeof(*map4), GFP_ATOMIC);
137 if (map4 == NULL)
138 goto cfg_unlbl_map_add_failure;
Paul Moore6a8b7f02013-08-02 14:45:08 -0400139 map4->def.type = NETLBL_NLTYPE_UNLABELED;
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500140 map4->list.addr = addr4->s_addr & mask4->s_addr;
141 map4->list.mask = mask4->s_addr;
142 map4->list.valid = 1;
143 ret_val = netlbl_af4list_add(&map4->list,
144 &addrmap->list4);
145 if (ret_val != 0)
146 goto cfg_unlbl_map_add_failure;
147 break;
Paul Moore1281bc22011-11-29 10:10:54 +0000148 }
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000149#if IS_ENABLED(CONFIG_IPV6)
Paul Moore1281bc22011-11-29 10:10:54 +0000150 case AF_INET6: {
151 const struct in6_addr *addr6 = addr;
152 const struct in6_addr *mask6 = mask;
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500153 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;
Paul Moore6a8b7f02013-08-02 14:45:08 -0400156 map6->def.type = NETLBL_NLTYPE_UNLABELED;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000157 map6->list.addr = *addr6;
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500158 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];
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000162 map6->list.mask = *mask6;
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500163 map6->list.valid = 1;
Dan Carpenter42ca0202011-11-23 21:18:20 +0000164 ret_val = netlbl_af6list_add(&map6->list,
165 &addrmap->list6);
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500166 if (ret_val != 0)
167 goto cfg_unlbl_map_add_failure;
168 break;
Paul Moore1281bc22011-11-29 10:10:54 +0000169 }
170#endif /* IPv6 */
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500171 default:
172 goto cfg_unlbl_map_add_failure;
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500173 }
174
Paul Moore6a8b7f02013-08-02 14:45:08 -0400175 entry->def.addrsel = addrmap;
176 entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500177 } else {
178 ret_val = -EINVAL;
179 goto cfg_unlbl_map_add_failure;
180 }
Paul Mooreeda61d32008-02-04 22:29:47 -0800181
182 ret_val = netlbl_domhsh_add(entry, audit_info);
183 if (ret_val != 0)
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500184 goto cfg_unlbl_map_add_failure;
Paul Mooreeda61d32008-02-04 22:29:47 -0800185
186 return 0;
187
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500188cfg_unlbl_map_add_failure:
Julia Lawall47943232009-07-27 06:15:43 +0000189 kfree(entry->domain);
Paul Mooreeda61d32008-02-04 22:29:47 -0800190 kfree(entry);
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500191 kfree(addrmap);
192 kfree(map4);
193 kfree(map6);
Paul Mooreeda61d32008-02-04 22:29:47 -0800194 return ret_val;
195}
196
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500197
Paul Mooreeda61d32008-02-04 22:29:47 -0800198/**
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500199 * netlbl_cfg_unlbl_static_add - Adds a new static label
200 * @net: network namespace
201 * @dev_name: interface name
202 * @addr: IP address in network byte order (struct in[6]_addr)
203 * @mask: address mask in network byte order (struct in[6]_addr)
204 * @family: address family
205 * @secid: LSM secid value for the entry
Paul Mooreeda61d32008-02-04 22:29:47 -0800206 * @audit_info: NetLabel audit information
207 *
208 * Description:
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500209 * Adds a new NetLabel static label to be used when protocol provided labels
210 * are not present on incoming traffic. If @dev_name is NULL then the default
211 * interface will be used. Returns zero on success, negative values on failure.
Paul Mooreeda61d32008-02-04 22:29:47 -0800212 *
213 */
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500214int netlbl_cfg_unlbl_static_add(struct net *net,
215 const char *dev_name,
216 const void *addr,
217 const void *mask,
218 u16 family,
219 u32 secid,
220 struct netlbl_audit *audit_info)
221{
222 u32 addr_len;
223
224 switch (family) {
225 case AF_INET:
226 addr_len = sizeof(struct in_addr);
227 break;
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000228#if IS_ENABLED(CONFIG_IPV6)
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500229 case AF_INET6:
230 addr_len = sizeof(struct in6_addr);
231 break;
Paul Moore1281bc22011-11-29 10:10:54 +0000232#endif /* IPv6 */
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500233 default:
234 return -EPFNOSUPPORT;
235 }
236
237 return netlbl_unlhsh_add(net,
238 dev_name, addr, mask, addr_len,
239 secid, audit_info);
240}
241
242/**
243 * netlbl_cfg_unlbl_static_del - Removes an existing static label
244 * @net: network namespace
245 * @dev_name: interface name
246 * @addr: IP address in network byte order (struct in[6]_addr)
247 * @mask: address mask in network byte order (struct in[6]_addr)
248 * @family: address family
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500249 * @audit_info: NetLabel audit information
250 *
251 * Description:
252 * Removes an existing NetLabel static label used when protocol provided labels
253 * are not present on incoming traffic. If @dev_name is NULL then the default
254 * interface will be used. Returns zero on success, negative values on failure.
255 *
256 */
257int netlbl_cfg_unlbl_static_del(struct net *net,
258 const char *dev_name,
259 const void *addr,
260 const void *mask,
261 u16 family,
262 struct netlbl_audit *audit_info)
263{
264 u32 addr_len;
265
266 switch (family) {
267 case AF_INET:
268 addr_len = sizeof(struct in_addr);
269 break;
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000270#if IS_ENABLED(CONFIG_IPV6)
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500271 case AF_INET6:
272 addr_len = sizeof(struct in6_addr);
273 break;
Paul Moore1281bc22011-11-29 10:10:54 +0000274#endif /* IPv6 */
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500275 default:
276 return -EPFNOSUPPORT;
277 }
278
279 return netlbl_unlhsh_remove(net,
280 dev_name, addr, mask, addr_len,
281 audit_info);
282}
283
284/**
285 * netlbl_cfg_cipsov4_add - Add a new CIPSOv4 DOI definition
286 * @doi_def: CIPSO DOI definition
287 * @audit_info: NetLabel audit information
288 *
289 * Description:
290 * Add a new CIPSO DOI definition as defined by @doi_def. Returns zero on
291 * success and negative values on failure.
292 *
293 */
294int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def,
295 struct netlbl_audit *audit_info)
296{
297 return cipso_v4_doi_add(doi_def, audit_info);
298}
299
300/**
301 * netlbl_cfg_cipsov4_del - Remove an existing CIPSOv4 DOI definition
302 * @doi: CIPSO DOI
303 * @audit_info: NetLabel audit information
304 *
305 * Description:
306 * Remove an existing CIPSO DOI definition matching @doi. Returns zero on
307 * success and negative values on failure.
308 *
309 */
310void netlbl_cfg_cipsov4_del(u32 doi, struct netlbl_audit *audit_info)
311{
312 cipso_v4_doi_remove(doi, audit_info);
313}
314
315/**
316 * netlbl_cfg_cipsov4_map_add - Add a new CIPSOv4 DOI mapping
317 * @doi: the CIPSO DOI
318 * @domain: the domain mapping to add
319 * @addr: IP address
320 * @mask: IP address mask
321 * @audit_info: NetLabel audit information
322 *
323 * Description:
324 * Add a new NetLabel/LSM domain mapping for the given CIPSO DOI to the NetLabel
325 * subsystem. A @domain value of NULL adds a new default domain mapping.
326 * Returns zero on success, negative values on failure.
327 *
328 */
329int netlbl_cfg_cipsov4_map_add(u32 doi,
Paul Mooreeda61d32008-02-04 22:29:47 -0800330 const char *domain,
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500331 const struct in_addr *addr,
332 const struct in_addr *mask,
Paul Mooreeda61d32008-02-04 22:29:47 -0800333 struct netlbl_audit *audit_info)
334{
335 int ret_val = -ENOMEM;
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500336 struct cipso_v4_doi *doi_def;
Paul Mooreeda61d32008-02-04 22:29:47 -0800337 struct netlbl_dom_map *entry;
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500338 struct netlbl_domaddr_map *addrmap = NULL;
339 struct netlbl_domaddr4_map *addrinfo = NULL;
Paul Mooreeda61d32008-02-04 22:29:47 -0800340
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500341 doi_def = cipso_v4_doi_getdef(doi);
342 if (doi_def == NULL)
343 return -ENOENT;
Paul Mooreb1edeb12008-10-10 10:16:31 -0400344
Paul Mooreeda61d32008-02-04 22:29:47 -0800345 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
346 if (entry == NULL)
Julia Lawall94a80d62011-08-11 00:06:04 +0000347 goto out_entry;
Paul Mooreeda61d32008-02-04 22:29:47 -0800348 if (domain != NULL) {
349 entry->domain = kstrdup(domain, GFP_ATOMIC);
350 if (entry->domain == NULL)
Julia Lawall94a80d62011-08-11 00:06:04 +0000351 goto out_domain;
Paul Mooreeda61d32008-02-04 22:29:47 -0800352 }
Paul Mooreeda61d32008-02-04 22:29:47 -0800353
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500354 if (addr == NULL && mask == NULL) {
Paul Moore6a8b7f02013-08-02 14:45:08 -0400355 entry->def.cipso = doi_def;
356 entry->def.type = NETLBL_NLTYPE_CIPSOV4;
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500357 } else if (addr != NULL && mask != NULL) {
358 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
359 if (addrmap == NULL)
Julia Lawall94a80d62011-08-11 00:06:04 +0000360 goto out_addrmap;
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500361 INIT_LIST_HEAD(&addrmap->list4);
362 INIT_LIST_HEAD(&addrmap->list6);
363
364 addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC);
365 if (addrinfo == NULL)
Julia Lawall94a80d62011-08-11 00:06:04 +0000366 goto out_addrinfo;
Paul Moore6a8b7f02013-08-02 14:45:08 -0400367 addrinfo->def.cipso = doi_def;
368 addrinfo->def.type = NETLBL_NLTYPE_CIPSOV4;
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500369 addrinfo->list.addr = addr->s_addr & mask->s_addr;
370 addrinfo->list.mask = mask->s_addr;
371 addrinfo->list.valid = 1;
372 ret_val = netlbl_af4list_add(&addrinfo->list, &addrmap->list4);
373 if (ret_val != 0)
374 goto cfg_cipsov4_map_add_failure;
375
Paul Moore6a8b7f02013-08-02 14:45:08 -0400376 entry->def.addrsel = addrmap;
377 entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500378 } else {
379 ret_val = -EINVAL;
Julia Lawall94a80d62011-08-11 00:06:04 +0000380 goto out_addrmap;
Paul Mooreb1edeb12008-10-10 10:16:31 -0400381 }
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500382
Paul Mooreeda61d32008-02-04 22:29:47 -0800383 ret_val = netlbl_domhsh_add(entry, audit_info);
384 if (ret_val != 0)
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500385 goto cfg_cipsov4_map_add_failure;
Paul Mooreeda61d32008-02-04 22:29:47 -0800386
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500387 return 0;
Paul Mooreb1edeb12008-10-10 10:16:31 -0400388
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500389cfg_cipsov4_map_add_failure:
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500390 kfree(addrinfo);
Julia Lawall94a80d62011-08-11 00:06:04 +0000391out_addrinfo:
392 kfree(addrmap);
393out_addrmap:
394 kfree(entry->domain);
395out_domain:
396 kfree(entry);
397out_entry:
398 cipso_v4_doi_putdef(doi_def);
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500399 return ret_val;
Paul Mooreeda61d32008-02-04 22:29:47 -0800400}
401
Paul Mooreeda61d32008-02-04 22:29:47 -0800402/*
Paul Moore02752762006-11-29 13:18:18 -0500403 * Security Attribute Functions
404 */
405
Paul Moore4b8feff2014-08-01 11:17:17 -0400406#define _CM_F_NONE 0x00000000
407#define _CM_F_ALLOC 0x00000001
Paul Moored960a612014-08-01 11:17:29 -0400408#define _CM_F_WALK 0x00000002
Paul Moore4b8feff2014-08-01 11:17:17 -0400409
410/**
Paul Moore4fbe63d2014-08-01 11:17:37 -0400411 * _netlbl_catmap_getnode - Get a individual node from a catmap
Paul Moore4b8feff2014-08-01 11:17:17 -0400412 * @catmap: pointer to the category bitmap
413 * @offset: the requested offset
414 * @cm_flags: catmap flags, see _CM_F_*
415 * @gfp_flags: memory allocation flags
416 *
417 * Description:
Paul Moored960a612014-08-01 11:17:29 -0400418 * Iterate through the catmap looking for the node associated with @offset.
419 * If the _CM_F_ALLOC flag is set in @cm_flags and there is no associated node,
420 * one will be created and inserted into the catmap. If the _CM_F_WALK flag is
421 * set in @cm_flags and there is no associated node, the next highest node will
422 * be returned. Returns a pointer to the node on success, NULL on failure.
Paul Moore4b8feff2014-08-01 11:17:17 -0400423 *
424 */
Paul Moore4fbe63d2014-08-01 11:17:37 -0400425static struct netlbl_lsm_catmap *_netlbl_catmap_getnode(
426 struct netlbl_lsm_catmap **catmap,
427 u32 offset,
428 unsigned int cm_flags,
429 gfp_t gfp_flags)
Paul Moore4b8feff2014-08-01 11:17:17 -0400430{
Paul Moore4fbe63d2014-08-01 11:17:37 -0400431 struct netlbl_lsm_catmap *iter = *catmap;
432 struct netlbl_lsm_catmap *prev = NULL;
Paul Moore4b8feff2014-08-01 11:17:17 -0400433
Paul Moored960a612014-08-01 11:17:29 -0400434 if (iter == NULL)
Paul Moore4fbe63d2014-08-01 11:17:37 -0400435 goto catmap_getnode_alloc;
Paul Moored960a612014-08-01 11:17:29 -0400436 if (offset < iter->startbit)
Paul Moore4fbe63d2014-08-01 11:17:37 -0400437 goto catmap_getnode_walk;
Paul Moore4b8feff2014-08-01 11:17:17 -0400438 while (iter && offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
439 prev = iter;
440 iter = iter->next;
441 }
442 if (iter == NULL || offset < iter->startbit)
Paul Moore4fbe63d2014-08-01 11:17:37 -0400443 goto catmap_getnode_walk;
Paul Moore4b8feff2014-08-01 11:17:17 -0400444
445 return iter;
446
Paul Moore4fbe63d2014-08-01 11:17:37 -0400447catmap_getnode_walk:
Paul Moored960a612014-08-01 11:17:29 -0400448 if (cm_flags & _CM_F_WALK)
449 return iter;
Paul Moore4fbe63d2014-08-01 11:17:37 -0400450catmap_getnode_alloc:
Paul Moore4b8feff2014-08-01 11:17:17 -0400451 if (!(cm_flags & _CM_F_ALLOC))
452 return NULL;
453
Paul Moore4fbe63d2014-08-01 11:17:37 -0400454 iter = netlbl_catmap_alloc(gfp_flags);
Paul Moore4b8feff2014-08-01 11:17:17 -0400455 if (iter == NULL)
456 return NULL;
457 iter->startbit = offset & ~(NETLBL_CATMAP_SIZE - 1);
458
459 if (prev == NULL) {
460 iter->next = *catmap;
461 *catmap = iter;
462 } else {
463 iter->next = prev->next;
464 prev->next = iter;
465 }
466
467 return iter;
468}
469
Paul Moore02752762006-11-29 13:18:18 -0500470/**
Paul Moore4fbe63d2014-08-01 11:17:37 -0400471 * netlbl_catmap_walk - Walk a LSM secattr catmap looking for a bit
Paul Moore02752762006-11-29 13:18:18 -0500472 * @catmap: the category bitmap
473 * @offset: the offset to start searching at, in bits
474 *
475 * Description:
476 * This function walks a LSM secattr category bitmap starting at @offset and
477 * returns the spot of the first set bit or -ENOENT if no bits are set.
478 *
479 */
Paul Moore4fbe63d2014-08-01 11:17:37 -0400480int netlbl_catmap_walk(struct netlbl_lsm_catmap *catmap, u32 offset)
Paul Moore02752762006-11-29 13:18:18 -0500481{
Paul Moore4fbe63d2014-08-01 11:17:37 -0400482 struct netlbl_lsm_catmap *iter = catmap;
Paul Moored960a612014-08-01 11:17:29 -0400483 u32 idx;
484 u32 bit;
Paul Moore02752762006-11-29 13:18:18 -0500485 NETLBL_CATMAP_MAPTYPE bitmap;
486
Paul Moore4fbe63d2014-08-01 11:17:37 -0400487 iter = _netlbl_catmap_getnode(&catmap, offset, _CM_F_WALK, 0);
Paul Moored960a612014-08-01 11:17:29 -0400488 if (iter == NULL)
489 return -ENOENT;
Paul Moore02752762006-11-29 13:18:18 -0500490 if (offset > iter->startbit) {
Paul Moored960a612014-08-01 11:17:29 -0400491 offset -= iter->startbit;
492 idx = offset / NETLBL_CATMAP_MAPSIZE;
493 bit = offset % NETLBL_CATMAP_MAPSIZE;
Paul Moore02752762006-11-29 13:18:18 -0500494 } else {
Paul Moored960a612014-08-01 11:17:29 -0400495 idx = 0;
496 bit = 0;
Paul Moore02752762006-11-29 13:18:18 -0500497 }
Paul Moored960a612014-08-01 11:17:29 -0400498 bitmap = iter->bitmap[idx] >> bit;
Paul Moore02752762006-11-29 13:18:18 -0500499
500 for (;;) {
501 if (bitmap != 0) {
502 while ((bitmap & NETLBL_CATMAP_BIT) == 0) {
503 bitmap >>= 1;
Paul Moored960a612014-08-01 11:17:29 -0400504 bit++;
Paul Moore02752762006-11-29 13:18:18 -0500505 }
506 return iter->startbit +
Paul Moored960a612014-08-01 11:17:29 -0400507 (NETLBL_CATMAP_MAPSIZE * idx) + bit;
Paul Moore02752762006-11-29 13:18:18 -0500508 }
Paul Moored960a612014-08-01 11:17:29 -0400509 if (++idx >= NETLBL_CATMAP_MAPCNT) {
Paul Moore02752762006-11-29 13:18:18 -0500510 if (iter->next != NULL) {
511 iter = iter->next;
Paul Moored960a612014-08-01 11:17:29 -0400512 idx = 0;
Paul Moore02752762006-11-29 13:18:18 -0500513 } else
514 return -ENOENT;
515 }
Paul Moored960a612014-08-01 11:17:29 -0400516 bitmap = iter->bitmap[idx];
517 bit = 0;
Paul Moore02752762006-11-29 13:18:18 -0500518 }
519
520 return -ENOENT;
521}
522
523/**
Paul Moore4fbe63d2014-08-01 11:17:37 -0400524 * netlbl_catmap_walkrng - Find the end of a string of set bits
Paul Moore02752762006-11-29 13:18:18 -0500525 * @catmap: the category bitmap
526 * @offset: the offset to start searching at, in bits
527 *
528 * Description:
529 * This function walks a LSM secattr category bitmap starting at @offset and
530 * returns the spot of the first cleared bit or -ENOENT if the offset is past
531 * the end of the bitmap.
532 *
533 */
Paul Moore4fbe63d2014-08-01 11:17:37 -0400534int netlbl_catmap_walkrng(struct netlbl_lsm_catmap *catmap, u32 offset)
Paul Moore02752762006-11-29 13:18:18 -0500535{
Paul Moore4fbe63d2014-08-01 11:17:37 -0400536 struct netlbl_lsm_catmap *iter;
537 struct netlbl_lsm_catmap *prev = NULL;
Paul Moored960a612014-08-01 11:17:29 -0400538 u32 idx;
539 u32 bit;
Paul Moore02752762006-11-29 13:18:18 -0500540 NETLBL_CATMAP_MAPTYPE bitmask;
541 NETLBL_CATMAP_MAPTYPE bitmap;
542
Paul Moore4fbe63d2014-08-01 11:17:37 -0400543 iter = _netlbl_catmap_getnode(&catmap, offset, _CM_F_WALK, 0);
Paul Moored960a612014-08-01 11:17:29 -0400544 if (iter == NULL)
545 return -ENOENT;
Paul Moore02752762006-11-29 13:18:18 -0500546 if (offset > iter->startbit) {
Paul Moored960a612014-08-01 11:17:29 -0400547 offset -= iter->startbit;
548 idx = offset / NETLBL_CATMAP_MAPSIZE;
549 bit = offset % NETLBL_CATMAP_MAPSIZE;
Paul Moore02752762006-11-29 13:18:18 -0500550 } else {
Paul Moored960a612014-08-01 11:17:29 -0400551 idx = 0;
552 bit = 0;
Paul Moore02752762006-11-29 13:18:18 -0500553 }
Paul Moored960a612014-08-01 11:17:29 -0400554 bitmask = NETLBL_CATMAP_BIT << bit;
Paul Moore02752762006-11-29 13:18:18 -0500555
556 for (;;) {
Paul Moored960a612014-08-01 11:17:29 -0400557 bitmap = iter->bitmap[idx];
Paul Moore02752762006-11-29 13:18:18 -0500558 while (bitmask != 0 && (bitmap & bitmask) != 0) {
559 bitmask <<= 1;
Paul Moored960a612014-08-01 11:17:29 -0400560 bit++;
Paul Moore02752762006-11-29 13:18:18 -0500561 }
562
Paul Moored960a612014-08-01 11:17:29 -0400563 if (prev && idx == 0 && bit == 0)
564 return prev->startbit + NETLBL_CATMAP_SIZE - 1;
565 else if (bitmask != 0)
Paul Moore02752762006-11-29 13:18:18 -0500566 return iter->startbit +
Paul Moored960a612014-08-01 11:17:29 -0400567 (NETLBL_CATMAP_MAPSIZE * idx) + bit - 1;
568 else if (++idx >= NETLBL_CATMAP_MAPCNT) {
Paul Moore02752762006-11-29 13:18:18 -0500569 if (iter->next == NULL)
Paul Moored960a612014-08-01 11:17:29 -0400570 return iter->startbit + NETLBL_CATMAP_SIZE - 1;
571 prev = iter;
Paul Moore02752762006-11-29 13:18:18 -0500572 iter = iter->next;
Paul Moored960a612014-08-01 11:17:29 -0400573 idx = 0;
Paul Moore02752762006-11-29 13:18:18 -0500574 }
575 bitmask = NETLBL_CATMAP_BIT;
Paul Moored960a612014-08-01 11:17:29 -0400576 bit = 0;
Paul Moore02752762006-11-29 13:18:18 -0500577 }
578
579 return -ENOENT;
580}
581
582/**
Paul Moore4fbe63d2014-08-01 11:17:37 -0400583 * netlbl_catmap_getlong - Export an unsigned long bitmap
Paul Moore4b8feff2014-08-01 11:17:17 -0400584 * @catmap: pointer to the category bitmap
585 * @offset: pointer to the requested offset
586 * @bitmap: the exported bitmap
587 *
588 * Description:
589 * Export a bitmap with an offset greater than or equal to @offset and return
590 * it in @bitmap. The @offset must be aligned to an unsigned long and will be
591 * updated on return if different from what was requested; if the catmap is
592 * empty at the requested offset and beyond, the @offset is set to (u32)-1.
593 * Returns zero on sucess, negative values on failure.
594 *
595 */
Paul Moore4fbe63d2014-08-01 11:17:37 -0400596int netlbl_catmap_getlong(struct netlbl_lsm_catmap *catmap,
597 u32 *offset,
598 unsigned long *bitmap)
Paul Moore4b8feff2014-08-01 11:17:17 -0400599{
Paul Moore4fbe63d2014-08-01 11:17:37 -0400600 struct netlbl_lsm_catmap *iter;
Paul Moore4b8feff2014-08-01 11:17:17 -0400601 u32 off = *offset;
602 u32 idx;
603
604 /* only allow aligned offsets */
605 if ((off & (BITS_PER_LONG - 1)) != 0)
606 return -EINVAL;
607
608 if (off < catmap->startbit) {
609 off = catmap->startbit;
610 *offset = off;
611 }
Paul Moore4fbe63d2014-08-01 11:17:37 -0400612 iter = _netlbl_catmap_getnode(&catmap, off, _CM_F_NONE, 0);
Paul Moore4b8feff2014-08-01 11:17:17 -0400613 if (iter == NULL) {
614 *offset = (u32)-1;
615 return 0;
616 }
617
618 if (off < iter->startbit) {
619 off = iter->startbit;
620 *offset = off;
621 } else
622 off -= iter->startbit;
623
624 idx = off / NETLBL_CATMAP_MAPSIZE;
625 *bitmap = iter->bitmap[idx] >> (off % NETLBL_CATMAP_SIZE);
626
627 return 0;
628}
629
630/**
Paul Moore4fbe63d2014-08-01 11:17:37 -0400631 * netlbl_catmap_setbit - Set a bit in a LSM secattr catmap
Paul Moore41c3bd22014-08-01 11:17:03 -0400632 * @catmap: pointer to the category bitmap
Paul Moore02752762006-11-29 13:18:18 -0500633 * @bit: the bit to set
634 * @flags: memory allocation flags
635 *
636 * Description:
637 * Set the bit specified by @bit in @catmap. Returns zero on success,
638 * negative values on failure.
639 *
640 */
Paul Moore4fbe63d2014-08-01 11:17:37 -0400641int netlbl_catmap_setbit(struct netlbl_lsm_catmap **catmap,
642 u32 bit,
643 gfp_t flags)
Paul Moore02752762006-11-29 13:18:18 -0500644{
Paul Moore4fbe63d2014-08-01 11:17:37 -0400645 struct netlbl_lsm_catmap *iter;
Paul Moore4b8feff2014-08-01 11:17:17 -0400646 u32 idx;
Paul Moore02752762006-11-29 13:18:18 -0500647
Paul Moore4fbe63d2014-08-01 11:17:37 -0400648 iter = _netlbl_catmap_getnode(catmap, bit, _CM_F_ALLOC, flags);
Paul Moore4b8feff2014-08-01 11:17:17 -0400649 if (iter == NULL)
650 return -ENOMEM;
Paul Moore02752762006-11-29 13:18:18 -0500651
Paul Moore4b8feff2014-08-01 11:17:17 -0400652 bit -= iter->startbit;
653 idx = bit / NETLBL_CATMAP_MAPSIZE;
654 iter->bitmap[idx] |= NETLBL_CATMAP_BIT << (bit % NETLBL_CATMAP_MAPSIZE);
Paul Moore02752762006-11-29 13:18:18 -0500655
656 return 0;
657}
658
659/**
Paul Moore4fbe63d2014-08-01 11:17:37 -0400660 * netlbl_catmap_setrng - Set a range of bits in a LSM secattr catmap
Paul Moore41c3bd22014-08-01 11:17:03 -0400661 * @catmap: pointer to the category bitmap
Paul Moore02752762006-11-29 13:18:18 -0500662 * @start: the starting bit
663 * @end: the last bit in the string
664 * @flags: memory allocation flags
665 *
666 * Description:
667 * Set a range of bits, starting at @start and ending with @end. Returns zero
668 * on success, negative values on failure.
669 *
670 */
Paul Moore4fbe63d2014-08-01 11:17:37 -0400671int netlbl_catmap_setrng(struct netlbl_lsm_catmap **catmap,
672 u32 start,
673 u32 end,
674 gfp_t flags)
Paul Moore02752762006-11-29 13:18:18 -0500675{
Paul Moore4b8feff2014-08-01 11:17:17 -0400676 int rc = 0;
677 u32 spot = start;
Paul Moore02752762006-11-29 13:18:18 -0500678
Paul Moore4b8feff2014-08-01 11:17:17 -0400679 while (rc == 0 && spot <= end) {
680 if (((spot & (BITS_PER_LONG - 1)) != 0) &&
681 ((end - spot) > BITS_PER_LONG)) {
Paul Moore4fbe63d2014-08-01 11:17:37 -0400682 rc = netlbl_catmap_setlong(catmap,
683 spot,
684 (unsigned long)-1,
685 flags);
Paul Moore4b8feff2014-08-01 11:17:17 -0400686 spot += BITS_PER_LONG;
687 } else
Paul Moore4fbe63d2014-08-01 11:17:37 -0400688 rc = netlbl_catmap_setbit(catmap, spot++, flags);
Paul Moore02752762006-11-29 13:18:18 -0500689 }
690
Paul Moore4b8feff2014-08-01 11:17:17 -0400691 return rc;
692}
693
694/**
Paul Moore4fbe63d2014-08-01 11:17:37 -0400695 * netlbl_catmap_setlong - Import an unsigned long bitmap
Paul Moore4b8feff2014-08-01 11:17:17 -0400696 * @catmap: pointer to the category bitmap
697 * @offset: offset to the start of the imported bitmap
698 * @bitmap: the bitmap to import
699 * @flags: memory allocation flags
700 *
701 * Description:
702 * Import the bitmap specified in @bitmap into @catmap, using the offset
703 * in @offset. The offset must be aligned to an unsigned long. Returns zero
704 * on success, negative values on failure.
705 *
706 */
Paul Moore4fbe63d2014-08-01 11:17:37 -0400707int netlbl_catmap_setlong(struct netlbl_lsm_catmap **catmap,
708 u32 offset,
709 unsigned long bitmap,
710 gfp_t flags)
Paul Moore4b8feff2014-08-01 11:17:17 -0400711{
Paul Moore4fbe63d2014-08-01 11:17:37 -0400712 struct netlbl_lsm_catmap *iter;
Paul Moore4b8feff2014-08-01 11:17:17 -0400713 u32 idx;
714
715 /* only allow aligned offsets */
716 if ((offset & (BITS_PER_LONG - 1)) != 0)
717 return -EINVAL;
718
Paul Moore4fbe63d2014-08-01 11:17:37 -0400719 iter = _netlbl_catmap_getnode(catmap, offset, _CM_F_ALLOC, flags);
Paul Moore4b8feff2014-08-01 11:17:17 -0400720 if (iter == NULL)
721 return -ENOMEM;
722
723 offset -= iter->startbit;
724 idx = offset / NETLBL_CATMAP_MAPSIZE;
725 iter->bitmap[idx] |= bitmap << (offset % NETLBL_CATMAP_MAPSIZE);
726
727 return 0;
Paul Moore02752762006-11-29 13:18:18 -0500728}
729
730/*
Paul Moored15c3452006-08-03 16:48:37 -0700731 * LSM Functions
732 */
733
734/**
Paul Moore23bcdc12007-07-18 12:28:45 -0400735 * netlbl_enabled - Determine if the NetLabel subsystem is enabled
736 *
737 * Description:
738 * The LSM can use this function to determine if it should use NetLabel
739 * security attributes in it's enforcement mechanism. Currently, NetLabel is
740 * considered to be enabled when it's configuration contains a valid setup for
741 * at least one labeled protocol (i.e. NetLabel can understand incoming
742 * labeled packets of at least one type); otherwise NetLabel is considered to
743 * be disabled.
744 *
745 */
746int netlbl_enabled(void)
747{
748 /* At some point we probably want to expose this mechanism to the user
749 * as well so that admins can toggle NetLabel regardless of the
750 * configuration */
Paul Moorec783f1c2008-01-29 08:37:52 -0500751 return (atomic_read(&netlabel_mgmt_protocount) > 0);
Paul Moore23bcdc12007-07-18 12:28:45 -0400752}
753
754/**
Paul Moore389fb8002009-03-27 17:10:34 -0400755 * netlbl_sock_setattr - Label a socket using the correct protocol
Paul Mooreba6ff9f2007-06-07 18:37:15 -0700756 * @sk: the socket to label
Paul Moore389fb8002009-03-27 17:10:34 -0400757 * @family: protocol family
Paul Moored15c3452006-08-03 16:48:37 -0700758 * @secattr: the security attributes
759 *
760 * Description:
761 * Attach the correct label to the given socket using the security attributes
Paul Mooreba6ff9f2007-06-07 18:37:15 -0700762 * specified in @secattr. This function requires exclusive access to @sk,
763 * which means it either needs to be in the process of being created or locked.
Paul Moore63c41682008-10-10 10:16:32 -0400764 * Returns zero on success, -EDESTADDRREQ if the domain is configured to use
765 * network address selectors (can't blindly label the socket), and negative
766 * values on all other failures.
Paul Moored15c3452006-08-03 16:48:37 -0700767 *
768 */
Paul Mooreba6ff9f2007-06-07 18:37:15 -0700769int netlbl_sock_setattr(struct sock *sk,
Paul Moore389fb8002009-03-27 17:10:34 -0400770 u16 family,
Paul Mooreba6ff9f2007-06-07 18:37:15 -0700771 const struct netlbl_lsm_secattr *secattr)
Paul Moored15c3452006-08-03 16:48:37 -0700772{
Paul Moore389fb8002009-03-27 17:10:34 -0400773 int ret_val;
Paul Moored15c3452006-08-03 16:48:37 -0700774 struct netlbl_dom_map *dom_entry;
775
776 rcu_read_lock();
777 dom_entry = netlbl_domhsh_getentry(secattr->domain);
Paul Moore389fb8002009-03-27 17:10:34 -0400778 if (dom_entry == NULL) {
779 ret_val = -ENOENT;
Paul Moored15c3452006-08-03 16:48:37 -0700780 goto socket_setattr_return;
Paul Moore389fb8002009-03-27 17:10:34 -0400781 }
782 switch (family) {
783 case AF_INET:
Paul Moore6a8b7f02013-08-02 14:45:08 -0400784 switch (dom_entry->def.type) {
Paul Moore389fb8002009-03-27 17:10:34 -0400785 case NETLBL_NLTYPE_ADDRSELECT:
786 ret_val = -EDESTADDRREQ;
787 break;
788 case NETLBL_NLTYPE_CIPSOV4:
789 ret_val = cipso_v4_sock_setattr(sk,
Paul Moore6a8b7f02013-08-02 14:45:08 -0400790 dom_entry->def.cipso,
791 secattr);
Paul Moore389fb8002009-03-27 17:10:34 -0400792 break;
793 case NETLBL_NLTYPE_UNLABELED:
794 ret_val = 0;
795 break;
796 default:
797 ret_val = -ENOENT;
798 }
Paul Moore63c41682008-10-10 10:16:32 -0400799 break;
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000800#if IS_ENABLED(CONFIG_IPV6)
Paul Moore389fb8002009-03-27 17:10:34 -0400801 case AF_INET6:
802 /* since we don't support any IPv6 labeling protocols right
803 * now we can optimize everything away until we do */
Paul Moored15c3452006-08-03 16:48:37 -0700804 ret_val = 0;
805 break;
Paul Moore389fb8002009-03-27 17:10:34 -0400806#endif /* IPv6 */
Paul Moored15c3452006-08-03 16:48:37 -0700807 default:
Paul Moore389fb8002009-03-27 17:10:34 -0400808 ret_val = -EPROTONOSUPPORT;
Paul Moored15c3452006-08-03 16:48:37 -0700809 }
810
811socket_setattr_return:
812 rcu_read_unlock();
813 return ret_val;
814}
815
816/**
Paul Moore014ab192008-10-10 10:16:33 -0400817 * netlbl_sock_delattr - Delete all the NetLabel labels on a socket
818 * @sk: the socket
819 *
820 * Description:
821 * Remove all the NetLabel labeling from @sk. The caller is responsible for
822 * ensuring that @sk is locked.
823 *
824 */
825void netlbl_sock_delattr(struct sock *sk)
826{
827 cipso_v4_sock_delattr(sk);
828}
829
830/**
Paul Moore14a72f52006-09-25 15:52:01 -0700831 * netlbl_sock_getattr - Determine the security attributes of a sock
832 * @sk: the sock
833 * @secattr: the security attributes
834 *
835 * Description:
Paul Moore8cc44572008-01-29 08:44:21 -0500836 * Examines the given sock to see if any NetLabel style labeling has been
Paul Moore14a72f52006-09-25 15:52:01 -0700837 * applied to the sock, if so it parses the socket label and returns the
838 * security attributes in @secattr. Returns zero on success, negative values
839 * on failure.
840 *
841 */
Paul Moore389fb8002009-03-27 17:10:34 -0400842int netlbl_sock_getattr(struct sock *sk,
843 struct netlbl_lsm_secattr *secattr)
Paul Moore14a72f52006-09-25 15:52:01 -0700844{
Paul Moore389fb8002009-03-27 17:10:34 -0400845 int ret_val;
846
847 switch (sk->sk_family) {
848 case AF_INET:
849 ret_val = cipso_v4_sock_getattr(sk, secattr);
850 break;
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000851#if IS_ENABLED(CONFIG_IPV6)
Paul Moore389fb8002009-03-27 17:10:34 -0400852 case AF_INET6:
853 ret_val = -ENOMSG;
854 break;
855#endif /* IPv6 */
856 default:
857 ret_val = -EPROTONOSUPPORT;
858 }
859
860 return ret_val;
Paul Moore14a72f52006-09-25 15:52:01 -0700861}
862
863/**
Paul Moore014ab192008-10-10 10:16:33 -0400864 * netlbl_conn_setattr - Label a connected socket using the correct protocol
865 * @sk: the socket to label
866 * @addr: the destination address
867 * @secattr: the security attributes
868 *
869 * Description:
870 * Attach the correct label to the given connected socket using the security
871 * attributes specified in @secattr. The caller is responsible for ensuring
872 * that @sk is locked. Returns zero on success, negative values on failure.
873 *
874 */
875int netlbl_conn_setattr(struct sock *sk,
876 struct sockaddr *addr,
877 const struct netlbl_lsm_secattr *secattr)
878{
879 int ret_val;
880 struct sockaddr_in *addr4;
Paul Moore6a8b7f02013-08-02 14:45:08 -0400881 struct netlbl_dommap_def *entry;
Paul Moore014ab192008-10-10 10:16:33 -0400882
883 rcu_read_lock();
884 switch (addr->sa_family) {
885 case AF_INET:
886 addr4 = (struct sockaddr_in *)addr;
Paul Moore6a8b7f02013-08-02 14:45:08 -0400887 entry = netlbl_domhsh_getentry_af4(secattr->domain,
888 addr4->sin_addr.s_addr);
889 if (entry == NULL) {
Paul Moore014ab192008-10-10 10:16:33 -0400890 ret_val = -ENOENT;
891 goto conn_setattr_return;
892 }
Paul Moore6a8b7f02013-08-02 14:45:08 -0400893 switch (entry->type) {
Paul Moore014ab192008-10-10 10:16:33 -0400894 case NETLBL_NLTYPE_CIPSOV4:
895 ret_val = cipso_v4_sock_setattr(sk,
Paul Moore6a8b7f02013-08-02 14:45:08 -0400896 entry->cipso, secattr);
Paul Moore014ab192008-10-10 10:16:33 -0400897 break;
898 case NETLBL_NLTYPE_UNLABELED:
899 /* just delete the protocols we support for right now
900 * but we could remove other protocols if needed */
901 cipso_v4_sock_delattr(sk);
902 ret_val = 0;
903 break;
904 default:
905 ret_val = -ENOENT;
906 }
907 break;
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000908#if IS_ENABLED(CONFIG_IPV6)
Paul Moore014ab192008-10-10 10:16:33 -0400909 case AF_INET6:
910 /* since we don't support any IPv6 labeling protocols right
911 * now we can optimize everything away until we do */
912 ret_val = 0;
913 break;
914#endif /* IPv6 */
915 default:
Paul Moore389fb8002009-03-27 17:10:34 -0400916 ret_val = -EPROTONOSUPPORT;
Paul Moore014ab192008-10-10 10:16:33 -0400917 }
918
919conn_setattr_return:
920 rcu_read_unlock();
921 return ret_val;
922}
923
924/**
Paul Moore389fb8002009-03-27 17:10:34 -0400925 * netlbl_req_setattr - Label a request socket using the correct protocol
926 * @req: the request socket to label
927 * @secattr: the security attributes
928 *
929 * Description:
930 * Attach the correct label to the given socket using the security attributes
931 * specified in @secattr. Returns zero on success, negative values on failure.
932 *
933 */
934int netlbl_req_setattr(struct request_sock *req,
935 const struct netlbl_lsm_secattr *secattr)
936{
937 int ret_val;
Paul Moore6a8b7f02013-08-02 14:45:08 -0400938 struct netlbl_dommap_def *entry;
Paul Moore389fb8002009-03-27 17:10:34 -0400939
940 rcu_read_lock();
Paul Moore389fb8002009-03-27 17:10:34 -0400941 switch (req->rsk_ops->family) {
942 case AF_INET:
Paul Moore6a8b7f02013-08-02 14:45:08 -0400943 entry = netlbl_domhsh_getentry_af4(secattr->domain,
Eric Dumazet634fb9792013-10-09 15:21:29 -0700944 inet_rsk(req)->ir_rmt_addr);
Paul Moore6a8b7f02013-08-02 14:45:08 -0400945 if (entry == NULL) {
946 ret_val = -ENOENT;
947 goto req_setattr_return;
Paul Moore389fb8002009-03-27 17:10:34 -0400948 }
Paul Moore6a8b7f02013-08-02 14:45:08 -0400949 switch (entry->type) {
Paul Moore389fb8002009-03-27 17:10:34 -0400950 case NETLBL_NLTYPE_CIPSOV4:
Paul Moore6a8b7f02013-08-02 14:45:08 -0400951 ret_val = cipso_v4_req_setattr(req,
952 entry->cipso, secattr);
Paul Moore389fb8002009-03-27 17:10:34 -0400953 break;
954 case NETLBL_NLTYPE_UNLABELED:
955 /* just delete the protocols we support for right now
956 * but we could remove other protocols if needed */
957 cipso_v4_req_delattr(req);
958 ret_val = 0;
959 break;
960 default:
961 ret_val = -ENOENT;
962 }
963 break;
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000964#if IS_ENABLED(CONFIG_IPV6)
Paul Moore389fb8002009-03-27 17:10:34 -0400965 case AF_INET6:
966 /* since we don't support any IPv6 labeling protocols right
967 * now we can optimize everything away until we do */
968 ret_val = 0;
969 break;
970#endif /* IPv6 */
971 default:
972 ret_val = -EPROTONOSUPPORT;
973 }
974
975req_setattr_return:
976 rcu_read_unlock();
977 return ret_val;
978}
979
980/**
Paul Moore07feee82009-03-27 17:10:54 -0400981* netlbl_req_delattr - Delete all the NetLabel labels on a socket
982* @req: the socket
983*
984* Description:
985* Remove all the NetLabel labeling from @req.
986*
987*/
988void netlbl_req_delattr(struct request_sock *req)
989{
990 cipso_v4_req_delattr(req);
991}
992
993/**
Paul Moore948bf852008-10-10 10:16:32 -0400994 * netlbl_skbuff_setattr - Label a packet using the correct protocol
995 * @skb: the packet
996 * @family: protocol family
997 * @secattr: the security attributes
998 *
999 * Description:
1000 * Attach the correct label to the given packet using the security attributes
1001 * specified in @secattr. Returns zero on success, negative values on failure.
1002 *
1003 */
1004int netlbl_skbuff_setattr(struct sk_buff *skb,
1005 u16 family,
1006 const struct netlbl_lsm_secattr *secattr)
1007{
1008 int ret_val;
1009 struct iphdr *hdr4;
Paul Moore6a8b7f02013-08-02 14:45:08 -04001010 struct netlbl_dommap_def *entry;
Paul Moore948bf852008-10-10 10:16:32 -04001011
1012 rcu_read_lock();
1013 switch (family) {
1014 case AF_INET:
1015 hdr4 = ip_hdr(skb);
Paul Moore6a8b7f02013-08-02 14:45:08 -04001016 entry = netlbl_domhsh_getentry_af4(secattr->domain,hdr4->daddr);
1017 if (entry == NULL) {
Paul Moore948bf852008-10-10 10:16:32 -04001018 ret_val = -ENOENT;
1019 goto skbuff_setattr_return;
1020 }
Paul Moore6a8b7f02013-08-02 14:45:08 -04001021 switch (entry->type) {
Paul Moore948bf852008-10-10 10:16:32 -04001022 case NETLBL_NLTYPE_CIPSOV4:
Paul Moore6a8b7f02013-08-02 14:45:08 -04001023 ret_val = cipso_v4_skbuff_setattr(skb, entry->cipso,
1024 secattr);
Paul Moore948bf852008-10-10 10:16:32 -04001025 break;
1026 case NETLBL_NLTYPE_UNLABELED:
1027 /* just delete the protocols we support for right now
1028 * but we could remove other protocols if needed */
1029 ret_val = cipso_v4_skbuff_delattr(skb);
1030 break;
1031 default:
1032 ret_val = -ENOENT;
1033 }
1034 break;
Eric Dumazetdfd56b82011-12-10 09:48:31 +00001035#if IS_ENABLED(CONFIG_IPV6)
Paul Moore948bf852008-10-10 10:16:32 -04001036 case AF_INET6:
1037 /* since we don't support any IPv6 labeling protocols right
1038 * now we can optimize everything away until we do */
1039 ret_val = 0;
1040 break;
1041#endif /* IPv6 */
1042 default:
Paul Moore389fb8002009-03-27 17:10:34 -04001043 ret_val = -EPROTONOSUPPORT;
Paul Moore948bf852008-10-10 10:16:32 -04001044 }
1045
1046skbuff_setattr_return:
1047 rcu_read_unlock();
1048 return ret_val;
1049}
1050
1051/**
Paul Moored15c3452006-08-03 16:48:37 -07001052 * netlbl_skbuff_getattr - Determine the security attributes of a packet
1053 * @skb: the packet
Paul Moore75e22912008-01-29 08:38:04 -05001054 * @family: protocol family
Paul Moored15c3452006-08-03 16:48:37 -07001055 * @secattr: the security attributes
1056 *
1057 * Description:
1058 * Examines the given packet to see if a recognized form of packet labeling
1059 * is present, if so it parses the packet label and returns the security
1060 * attributes in @secattr. Returns zero on success, negative values on
1061 * failure.
1062 *
1063 */
1064int netlbl_skbuff_getattr(const struct sk_buff *skb,
Paul Moore75e22912008-01-29 08:38:04 -05001065 u16 family,
Paul Moored15c3452006-08-03 16:48:37 -07001066 struct netlbl_lsm_secattr *secattr)
1067{
Paul Moore04f81f02015-02-11 14:46:37 -05001068 unsigned char *ptr;
1069
Paul Moore389fb8002009-03-27 17:10:34 -04001070 switch (family) {
1071 case AF_INET:
Paul Moore04f81f02015-02-11 14:46:37 -05001072 ptr = cipso_v4_optptr(skb);
1073 if (ptr && cipso_v4_getattr(ptr, secattr) == 0)
Paul Moore389fb8002009-03-27 17:10:34 -04001074 return 0;
1075 break;
Eric Dumazetdfd56b82011-12-10 09:48:31 +00001076#if IS_ENABLED(CONFIG_IPV6)
Paul Moore389fb8002009-03-27 17:10:34 -04001077 case AF_INET6:
1078 break;
1079#endif /* IPv6 */
1080 }
Paul Moored15c3452006-08-03 16:48:37 -07001081
Paul Moore8cc44572008-01-29 08:44:21 -05001082 return netlbl_unlabel_getattr(skb, family, secattr);
Paul Moored15c3452006-08-03 16:48:37 -07001083}
1084
1085/**
1086 * netlbl_skbuff_err - Handle a LSM error on a sk_buff
1087 * @skb: the packet
1088 * @error: the error code
Paul Mooredfaebe92008-10-10 10:16:31 -04001089 * @gateway: true if host is acting as a gateway, false otherwise
Paul Moored15c3452006-08-03 16:48:37 -07001090 *
1091 * Description:
1092 * Deal with a LSM problem when handling the packet in @skb, typically this is
1093 * a permission denied problem (-EACCES). The correct action is determined
1094 * according to the packet's labeling protocol.
1095 *
1096 */
Paul Mooredfaebe92008-10-10 10:16:31 -04001097void netlbl_skbuff_err(struct sk_buff *skb, int error, int gateway)
Paul Moored15c3452006-08-03 16:48:37 -07001098{
Paul Moore04f81f02015-02-11 14:46:37 -05001099 if (cipso_v4_optptr(skb))
Paul Mooredfaebe92008-10-10 10:16:31 -04001100 cipso_v4_error(skb, error, gateway);
Paul Moored15c3452006-08-03 16:48:37 -07001101}
1102
1103/**
1104 * netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches
1105 *
1106 * Description:
1107 * For all of the NetLabel protocols that support some form of label mapping
1108 * cache, invalidate the cache. Returns zero on success, negative values on
1109 * error.
1110 *
1111 */
1112void netlbl_cache_invalidate(void)
1113{
1114 cipso_v4_cache_invalidate();
1115}
1116
1117/**
1118 * netlbl_cache_add - Add an entry to a NetLabel protocol cache
1119 * @skb: the packet
1120 * @secattr: the packet's security attributes
1121 *
1122 * Description:
1123 * Add the LSM security attributes for the given packet to the underlying
1124 * NetLabel protocol's label mapping cache. Returns zero on success, negative
1125 * values on error.
1126 *
1127 */
1128int netlbl_cache_add(const struct sk_buff *skb,
1129 const struct netlbl_lsm_secattr *secattr)
1130{
Paul Moore04f81f02015-02-11 14:46:37 -05001131 unsigned char *ptr;
1132
Paul Moore701a90b2006-11-17 17:38:46 -05001133 if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0)
Paul Moored15c3452006-08-03 16:48:37 -07001134 return -ENOMSG;
1135
Paul Moore04f81f02015-02-11 14:46:37 -05001136 ptr = cipso_v4_optptr(skb);
1137 if (ptr)
1138 return cipso_v4_cache_add(ptr, secattr);
Paul Moored15c3452006-08-03 16:48:37 -07001139
1140 return -ENOMSG;
1141}
1142
1143/*
Paul Moore6c2e8ac2008-12-31 12:54:11 -05001144 * Protocol Engine Functions
1145 */
1146
1147/**
1148 * netlbl_audit_start - Start an audit message
1149 * @type: audit message type
1150 * @audit_info: NetLabel audit information
1151 *
1152 * Description:
1153 * Start an audit message using the type specified in @type and fill the audit
1154 * message with some fields common to all NetLabel audit messages. This
1155 * function should only be used by protocol engines, not LSMs. Returns a
1156 * pointer to the audit buffer on success, NULL on failure.
1157 *
1158 */
1159struct audit_buffer *netlbl_audit_start(int type,
1160 struct netlbl_audit *audit_info)
1161{
1162 return netlbl_audit_start_common(type, audit_info);
1163}
1164
1165/*
Paul Moored15c3452006-08-03 16:48:37 -07001166 * Setup Functions
1167 */
1168
1169/**
1170 * netlbl_init - Initialize NetLabel
1171 *
1172 * Description:
1173 * Perform the required NetLabel initialization before first use.
1174 *
1175 */
1176static int __init netlbl_init(void)
1177{
1178 int ret_val;
1179
1180 printk(KERN_INFO "NetLabel: Initializing\n");
1181 printk(KERN_INFO "NetLabel: domain hash size = %u\n",
1182 (1 << NETLBL_DOMHSH_BITSIZE));
1183 printk(KERN_INFO "NetLabel: protocols ="
1184 " UNLABELED"
1185 " CIPSOv4"
1186 "\n");
1187
1188 ret_val = netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE);
1189 if (ret_val != 0)
1190 goto init_failure;
1191
Paul Moore8cc44572008-01-29 08:44:21 -05001192 ret_val = netlbl_unlabel_init(NETLBL_UNLHSH_BITSIZE);
1193 if (ret_val != 0)
1194 goto init_failure;
1195
Paul Moored15c3452006-08-03 16:48:37 -07001196 ret_val = netlbl_netlink_init();
1197 if (ret_val != 0)
1198 goto init_failure;
1199
1200 ret_val = netlbl_unlabel_defconf();
1201 if (ret_val != 0)
1202 goto init_failure;
1203 printk(KERN_INFO "NetLabel: unlabeled traffic allowed by default\n");
1204
1205 return 0;
1206
1207init_failure:
1208 panic("NetLabel: failed to initialize properly (%d)\n", ret_val);
1209}
1210
1211subsys_initcall(netlbl_init);