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1/*
2 * NetLabel System
3 *
4 * The NetLabel system manages static and dynamic label mappings for network
5 * protocols such as CIPSO and RIPSO.
6 *
7 * Author: Paul Moore <paul@paul-moore.com>
8 *
9 */
10
11/*
12 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
18 *
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
22 * the GNU General Public License for more details.
23 *
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, see <http://www.gnu.org/licenses/>.
26 *
27 */
28
29#ifndef _NETLABEL_H
30#define _NETLABEL_H
31
32#include <linux/types.h>
33#include <linux/slab.h>
34#include <linux/net.h>
35#include <linux/skbuff.h>
36#include <linux/in.h>
37#include <linux/in6.h>
38#include <net/netlink.h>
39#include <net/request_sock.h>
40#include <linux/atomic.h>
41
42struct cipso_v4_doi;
43
44/*
45 * NetLabel - A management interface for maintaining network packet label
46 * mapping tables for explicit packet labling protocols.
47 *
48 * Network protocols such as CIPSO and RIPSO require a label translation layer
49 * to convert the label on the packet into something meaningful on the host
50 * machine. In the current Linux implementation these mapping tables live
51 * inside the kernel; NetLabel provides a mechanism for user space applications
52 * to manage these mapping tables.
53 *
54 * NetLabel makes use of the Generic NETLINK mechanism as a transport layer to
55 * send messages between kernel and user space. The general format of a
56 * NetLabel message is shown below:
57 *
58 * +-----------------+-------------------+--------- --- -- -
59 * | struct nlmsghdr | struct genlmsghdr | payload
60 * +-----------------+-------------------+--------- --- -- -
61 *
62 * The 'nlmsghdr' and 'genlmsghdr' structs should be dealt with like normal.
63 * The payload is dependent on the subsystem specified in the
64 * 'nlmsghdr->nlmsg_type' and should be defined below, supporting functions
65 * should be defined in the corresponding net/netlabel/netlabel_<subsys>.h|c
66 * file. All of the fields in the NetLabel payload are NETLINK attributes, see
67 * the include/net/netlink.h file for more information on NETLINK attributes.
68 *
69 */
70
71/*
72 * NetLabel NETLINK protocol
73 */
74
75/* NetLabel NETLINK protocol version
76 * 1: initial version
77 * 2: added static labels for unlabeled connections
78 * 3: network selectors added to the NetLabel/LSM domain mapping and the
79 * CIPSO_V4_MAP_LOCAL CIPSO mapping was added
80 */
81#define NETLBL_PROTO_VERSION 3
82
83/* NetLabel NETLINK types/families */
84#define NETLBL_NLTYPE_NONE 0
85#define NETLBL_NLTYPE_MGMT 1
86#define NETLBL_NLTYPE_MGMT_NAME "NLBL_MGMT"
87#define NETLBL_NLTYPE_RIPSO 2
88#define NETLBL_NLTYPE_RIPSO_NAME "NLBL_RIPSO"
89#define NETLBL_NLTYPE_CIPSOV4 3
90#define NETLBL_NLTYPE_CIPSOV4_NAME "NLBL_CIPSOv4"
91#define NETLBL_NLTYPE_CIPSOV6 4
92#define NETLBL_NLTYPE_CIPSOV6_NAME "NLBL_CIPSOv6"
93#define NETLBL_NLTYPE_UNLABELED 5
94#define NETLBL_NLTYPE_UNLABELED_NAME "NLBL_UNLBL"
95#define NETLBL_NLTYPE_ADDRSELECT 6
96#define NETLBL_NLTYPE_ADDRSELECT_NAME "NLBL_ADRSEL"
97
98/*
99 * NetLabel - Kernel API for accessing the network packet label mappings.
100 *
101 * The following functions are provided for use by other kernel modules,
102 * specifically kernel LSM modules, to provide a consistent, transparent API
103 * for dealing with explicit packet labeling protocols such as CIPSO and
104 * RIPSO. The functions defined here are implemented in the
105 * net/netlabel/netlabel_kapi.c file.
106 *
107 */
108
109/* NetLabel audit information */
110struct netlbl_audit {
111 u32 secid;
112 kuid_t loginuid;
113 unsigned int sessionid;
114};
115
116/*
117 * LSM security attributes
118 */
119
120/**
121 * struct netlbl_lsm_cache - NetLabel LSM security attribute cache
122 * @refcount: atomic reference counter
123 * @free: LSM supplied function to free the cache data
124 * @data: LSM supplied cache data
125 *
126 * Description:
127 * This structure is provided for LSMs which wish to make use of the NetLabel
128 * caching mechanism to store LSM specific data/attributes in the NetLabel
129 * cache. If the LSM has to perform a lot of translation from the NetLabel
130 * security attributes into it's own internal representation then the cache
131 * mechanism can provide a way to eliminate some or all of that translation
132 * overhead on a cache hit.
133 *
134 */
135struct netlbl_lsm_cache {
136 atomic_t refcount;
137 void (*free) (const void *data);
138 void *data;
139};
140
141/**
142 * struct netlbl_lsm_catmap - NetLabel LSM secattr category bitmap
143 * @startbit: the value of the lowest order bit in the bitmap
144 * @bitmap: the category bitmap
145 * @next: pointer to the next bitmap "node" or NULL
146 *
147 * Description:
148 * This structure is used to represent category bitmaps. Due to the large
149 * number of categories supported by most labeling protocols it is not
150 * practical to transfer a full bitmap internally so NetLabel adopts a sparse
151 * bitmap structure modeled after SELinux's ebitmap structure.
152 * The catmap bitmap field MUST be a power of two in length and large
153 * enough to hold at least 240 bits. Special care (i.e. check the code!)
154 * should be used when changing these values as the LSM implementation
155 * probably has functions which rely on the sizes of these types to speed
156 * processing.
157 *
158 */
159#define NETLBL_CATMAP_MAPTYPE u64
160#define NETLBL_CATMAP_MAPCNT 4
161#define NETLBL_CATMAP_MAPSIZE (sizeof(NETLBL_CATMAP_MAPTYPE) * 8)
162#define NETLBL_CATMAP_SIZE (NETLBL_CATMAP_MAPSIZE * \
163 NETLBL_CATMAP_MAPCNT)
164#define NETLBL_CATMAP_BIT (NETLBL_CATMAP_MAPTYPE)0x01
165struct netlbl_lsm_catmap {
166 u32 startbit;
167 NETLBL_CATMAP_MAPTYPE bitmap[NETLBL_CATMAP_MAPCNT];
168 struct netlbl_lsm_catmap *next;
169};
170
171/**
172 * struct netlbl_lsm_secattr - NetLabel LSM security attributes
173 * @flags: indicate structure attributes, see NETLBL_SECATTR_*
174 * @type: indicate the NLTYPE of the attributes
175 * @domain: the NetLabel LSM domain
176 * @cache: NetLabel LSM specific cache
177 * @attr.mls: MLS sensitivity label
178 * @attr.mls.cat: MLS category bitmap
179 * @attr.mls.lvl: MLS sensitivity level
180 * @attr.secid: LSM specific secid token
181 *
182 * Description:
183 * This structure is used to pass security attributes between NetLabel and the
184 * LSM modules. The flags field is used to specify which fields within the
185 * struct are valid and valid values can be created by bitwise OR'ing the
186 * NETLBL_SECATTR_* defines. The domain field is typically set by the LSM to
187 * specify domain specific configuration settings and is not usually used by
188 * NetLabel itself when returning security attributes to the LSM.
189 *
190 */
191struct netlbl_lsm_secattr {
192 u32 flags;
193 /* bitmap values for 'flags' */
194#define NETLBL_SECATTR_NONE 0x00000000
195#define NETLBL_SECATTR_DOMAIN 0x00000001
196#define NETLBL_SECATTR_DOMAIN_CPY (NETLBL_SECATTR_DOMAIN | \
197 NETLBL_SECATTR_FREE_DOMAIN)
198#define NETLBL_SECATTR_CACHE 0x00000002
199#define NETLBL_SECATTR_MLS_LVL 0x00000004
200#define NETLBL_SECATTR_MLS_CAT 0x00000008
201#define NETLBL_SECATTR_SECID 0x00000010
202 /* bitmap meta-values for 'flags' */
203#define NETLBL_SECATTR_FREE_DOMAIN 0x01000000
204#define NETLBL_SECATTR_CACHEABLE (NETLBL_SECATTR_MLS_LVL | \
205 NETLBL_SECATTR_MLS_CAT | \
206 NETLBL_SECATTR_SECID)
207 u32 type;
208 char *domain;
209 struct netlbl_lsm_cache *cache;
210 struct {
211 struct {
212 struct netlbl_lsm_catmap *cat;
213 u32 lvl;
214 } mls;
215 u32 secid;
216 } attr;
217};
218
219/*
220 * LSM security attribute operations (inline)
221 */
222
223/**
224 * netlbl_secattr_cache_alloc - Allocate and initialize a secattr cache
225 * @flags: the memory allocation flags
226 *
227 * Description:
228 * Allocate and initialize a netlbl_lsm_cache structure. Returns a pointer
229 * on success, NULL on failure.
230 *
231 */
232static inline struct netlbl_lsm_cache *netlbl_secattr_cache_alloc(gfp_t flags)
233{
234 struct netlbl_lsm_cache *cache;
235
236 cache = kzalloc(sizeof(*cache), flags);
237 if (cache)
238 atomic_set(&cache->refcount, 1);
239 return cache;
240}
241
242/**
243 * netlbl_secattr_cache_free - Frees a netlbl_lsm_cache struct
244 * @cache: the struct to free
245 *
246 * Description:
247 * Frees @secattr including all of the internal buffers.
248 *
249 */
250static inline void netlbl_secattr_cache_free(struct netlbl_lsm_cache *cache)
251{
252 if (!atomic_dec_and_test(&cache->refcount))
253 return;
254
255 if (cache->free)
256 cache->free(cache->data);
257 kfree(cache);
258}
259
260/**
261 * netlbl_catmap_alloc - Allocate a LSM secattr catmap
262 * @flags: memory allocation flags
263 *
264 * Description:
265 * Allocate memory for a LSM secattr catmap, returns a pointer on success, NULL
266 * on failure.
267 *
268 */
269static inline struct netlbl_lsm_catmap *netlbl_catmap_alloc(gfp_t flags)
270{
271 return kzalloc(sizeof(struct netlbl_lsm_catmap), flags);
272}
273
274/**
275 * netlbl_catmap_free - Free a LSM secattr catmap
276 * @catmap: the category bitmap
277 *
278 * Description:
279 * Free a LSM secattr catmap.
280 *
281 */
282static inline void netlbl_catmap_free(struct netlbl_lsm_catmap *catmap)
283{
284 struct netlbl_lsm_catmap *iter;
285
286 while (catmap) {
287 iter = catmap;
288 catmap = catmap->next;
289 kfree(iter);
290 }
291}
292
293/**
294 * netlbl_secattr_init - Initialize a netlbl_lsm_secattr struct
295 * @secattr: the struct to initialize
296 *
297 * Description:
298 * Initialize an already allocated netlbl_lsm_secattr struct.
299 *
300 */
301static inline void netlbl_secattr_init(struct netlbl_lsm_secattr *secattr)
302{
303 memset(secattr, 0, sizeof(*secattr));
304}
305
306/**
307 * netlbl_secattr_destroy - Clears a netlbl_lsm_secattr struct
308 * @secattr: the struct to clear
309 *
310 * Description:
311 * Destroys the @secattr struct, including freeing all of the internal buffers.
312 * The struct must be reset with a call to netlbl_secattr_init() before reuse.
313 *
314 */
315static inline void netlbl_secattr_destroy(struct netlbl_lsm_secattr *secattr)
316{
317 if (secattr->flags & NETLBL_SECATTR_FREE_DOMAIN)
318 kfree(secattr->domain);
319 if (secattr->flags & NETLBL_SECATTR_CACHE)
320 netlbl_secattr_cache_free(secattr->cache);
321 if (secattr->flags & NETLBL_SECATTR_MLS_CAT)
322 netlbl_catmap_free(secattr->attr.mls.cat);
323}
324
325/**
326 * netlbl_secattr_alloc - Allocate and initialize a netlbl_lsm_secattr struct
327 * @flags: the memory allocation flags
328 *
329 * Description:
330 * Allocate and initialize a netlbl_lsm_secattr struct. Returns a valid
331 * pointer on success, or NULL on failure.
332 *
333 */
334static inline struct netlbl_lsm_secattr *netlbl_secattr_alloc(gfp_t flags)
335{
336 return kzalloc(sizeof(struct netlbl_lsm_secattr), flags);
337}
338
339/**
340 * netlbl_secattr_free - Frees a netlbl_lsm_secattr struct
341 * @secattr: the struct to free
342 *
343 * Description:
344 * Frees @secattr including all of the internal buffers.
345 *
346 */
347static inline void netlbl_secattr_free(struct netlbl_lsm_secattr *secattr)
348{
349 netlbl_secattr_destroy(secattr);
350 kfree(secattr);
351}
352
353#ifdef CONFIG_NETLABEL
354/*
355 * LSM configuration operations
356 */
357int netlbl_cfg_map_del(const char *domain,
358 u16 family,
359 const void *addr,
360 const void *mask,
361 struct netlbl_audit *audit_info);
362int netlbl_cfg_unlbl_map_add(const char *domain,
363 u16 family,
364 const void *addr,
365 const void *mask,
366 struct netlbl_audit *audit_info);
367int netlbl_cfg_unlbl_static_add(struct net *net,
368 const char *dev_name,
369 const void *addr,
370 const void *mask,
371 u16 family,
372 u32 secid,
373 struct netlbl_audit *audit_info);
374int netlbl_cfg_unlbl_static_del(struct net *net,
375 const char *dev_name,
376 const void *addr,
377 const void *mask,
378 u16 family,
379 struct netlbl_audit *audit_info);
380int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def,
381 struct netlbl_audit *audit_info);
382void netlbl_cfg_cipsov4_del(u32 doi, struct netlbl_audit *audit_info);
383int netlbl_cfg_cipsov4_map_add(u32 doi,
384 const char *domain,
385 const struct in_addr *addr,
386 const struct in_addr *mask,
387 struct netlbl_audit *audit_info);
388/*
389 * LSM security attribute operations
390 */
391int netlbl_catmap_walk(struct netlbl_lsm_catmap *catmap, u32 offset);
392int netlbl_catmap_walkrng(struct netlbl_lsm_catmap *catmap, u32 offset);
393int netlbl_catmap_getlong(struct netlbl_lsm_catmap *catmap,
394 u32 *offset,
395 unsigned long *bitmap);
396int netlbl_catmap_setbit(struct netlbl_lsm_catmap **catmap,
397 u32 bit,
398 gfp_t flags);
399int netlbl_catmap_setrng(struct netlbl_lsm_catmap **catmap,
400 u32 start,
401 u32 end,
402 gfp_t flags);
403int netlbl_catmap_setlong(struct netlbl_lsm_catmap **catmap,
404 u32 offset,
405 unsigned long bitmap,
406 gfp_t flags);
407
408/*
409 * LSM protocol operations (NetLabel LSM/kernel API)
410 */
411int netlbl_enabled(void);
412int netlbl_sock_setattr(struct sock *sk,
413 u16 family,
414 const struct netlbl_lsm_secattr *secattr);
415void netlbl_sock_delattr(struct sock *sk);
416int netlbl_sock_getattr(struct sock *sk,
417 struct netlbl_lsm_secattr *secattr);
418int netlbl_conn_setattr(struct sock *sk,
419 struct sockaddr *addr,
420 const struct netlbl_lsm_secattr *secattr);
421int netlbl_req_setattr(struct request_sock *req,
422 const struct netlbl_lsm_secattr *secattr);
423void netlbl_req_delattr(struct request_sock *req);
424int netlbl_skbuff_setattr(struct sk_buff *skb,
425 u16 family,
426 const struct netlbl_lsm_secattr *secattr);
427int netlbl_skbuff_getattr(const struct sk_buff *skb,
428 u16 family,
429 struct netlbl_lsm_secattr *secattr);
430void netlbl_skbuff_err(struct sk_buff *skb, int error, int gateway);
431
432/*
433 * LSM label mapping cache operations
434 */
435void netlbl_cache_invalidate(void);
436int netlbl_cache_add(const struct sk_buff *skb,
437 const struct netlbl_lsm_secattr *secattr);
438
439/*
440 * Protocol engine operations
441 */
442struct audit_buffer *netlbl_audit_start(int type,
443 struct netlbl_audit *audit_info);
444#else
445static inline int netlbl_cfg_map_del(const char *domain,
446 u16 family,
447 const void *addr,
448 const void *mask,
449 struct netlbl_audit *audit_info)
450{
451 return -ENOSYS;
452}
453static inline int netlbl_cfg_unlbl_map_add(const char *domain,
454 u16 family,
455 void *addr,
456 void *mask,
457 struct netlbl_audit *audit_info)
458{
459 return -ENOSYS;
460}
461static inline int netlbl_cfg_unlbl_static_add(struct net *net,
462 const char *dev_name,
463 const void *addr,
464 const void *mask,
465 u16 family,
466 u32 secid,
467 struct netlbl_audit *audit_info)
468{
469 return -ENOSYS;
470}
471static inline int netlbl_cfg_unlbl_static_del(struct net *net,
472 const char *dev_name,
473 const void *addr,
474 const void *mask,
475 u16 family,
476 struct netlbl_audit *audit_info)
477{
478 return -ENOSYS;
479}
480static inline int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def,
481 struct netlbl_audit *audit_info)
482{
483 return -ENOSYS;
484}
485static inline void netlbl_cfg_cipsov4_del(u32 doi,
486 struct netlbl_audit *audit_info)
487{
488 return;
489}
490static inline int netlbl_cfg_cipsov4_map_add(u32 doi,
491 const char *domain,
492 const struct in_addr *addr,
493 const struct in_addr *mask,
494 struct netlbl_audit *audit_info)
495{
496 return -ENOSYS;
497}
498static inline int netlbl_catmap_walk(struct netlbl_lsm_catmap *catmap,
499 u32 offset)
500{
501 return -ENOENT;
502}
503static inline int netlbl_catmap_walkrng(struct netlbl_lsm_catmap *catmap,
504 u32 offset)
505{
506 return -ENOENT;
507}
508static inline int netlbl_catmap_getlong(struct netlbl_lsm_catmap *catmap,
509 u32 *offset,
510 unsigned long *bitmap)
511{
512 return 0;
513}
514static inline int netlbl_catmap_setbit(struct netlbl_lsm_catmap **catmap,
515 u32 bit,
516 gfp_t flags)
517{
518 return 0;
519}
520static inline int netlbl_catmap_setrng(struct netlbl_lsm_catmap **catmap,
521 u32 start,
522 u32 end,
523 gfp_t flags)
524{
525 return 0;
526}
527static inline int netlbl_catmap_setlong(struct netlbl_lsm_catmap **catmap,
528 u32 offset,
529 unsigned long bitmap,
530 gfp_t flags)
531{
532 return 0;
533}
534static inline int netlbl_enabled(void)
535{
536 return 0;
537}
538static inline int netlbl_sock_setattr(struct sock *sk,
539 u16 family,
540 const struct netlbl_lsm_secattr *secattr)
541{
542 return -ENOSYS;
543}
544static inline void netlbl_sock_delattr(struct sock *sk)
545{
546}
547static inline int netlbl_sock_getattr(struct sock *sk,
548 struct netlbl_lsm_secattr *secattr)
549{
550 return -ENOSYS;
551}
552static inline int netlbl_conn_setattr(struct sock *sk,
553 struct sockaddr *addr,
554 const struct netlbl_lsm_secattr *secattr)
555{
556 return -ENOSYS;
557}
558static inline int netlbl_req_setattr(struct request_sock *req,
559 const struct netlbl_lsm_secattr *secattr)
560{
561 return -ENOSYS;
562}
563static inline void netlbl_req_delattr(struct request_sock *req)
564{
565 return;
566}
567static inline int netlbl_skbuff_setattr(struct sk_buff *skb,
568 u16 family,
569 const struct netlbl_lsm_secattr *secattr)
570{
571 return -ENOSYS;
572}
573static inline int netlbl_skbuff_getattr(const struct sk_buff *skb,
574 u16 family,
575 struct netlbl_lsm_secattr *secattr)
576{
577 return -ENOSYS;
578}
579static inline void netlbl_skbuff_err(struct sk_buff *skb,
580 int error,
581 int gateway)
582{
583 return;
584}
585static inline void netlbl_cache_invalidate(void)
586{
587 return;
588}
589static inline int netlbl_cache_add(const struct sk_buff *skb,
590 const struct netlbl_lsm_secattr *secattr)
591{
592 return 0;
593}
594static inline struct audit_buffer *netlbl_audit_start(int type,
595 struct netlbl_audit *audit_info)
596{
597 return NULL;
598}
599#endif /* CONFIG_NETLABEL */
600
601#endif /* _NETLABEL_H */
1/*
2 * NetLabel System
3 *
4 * The NetLabel system manages static and dynamic label mappings for network
5 * protocols such as CIPSO and RIPSO.
6 *
7 * Author: Paul Moore <paul@paul-moore.com>
8 *
9 */
10
11/*
12 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
18 *
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
22 * the GNU General Public License for more details.
23 *
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, write to the Free Software
26 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
27 *
28 */
29
30#ifndef _NETLABEL_H
31#define _NETLABEL_H
32
33#include <linux/types.h>
34#include <linux/slab.h>
35#include <linux/net.h>
36#include <linux/skbuff.h>
37#include <linux/in.h>
38#include <linux/in6.h>
39#include <net/netlink.h>
40#include <net/request_sock.h>
41#include <linux/atomic.h>
42
43struct cipso_v4_doi;
44
45/*
46 * NetLabel - A management interface for maintaining network packet label
47 * mapping tables for explicit packet labling protocols.
48 *
49 * Network protocols such as CIPSO and RIPSO require a label translation layer
50 * to convert the label on the packet into something meaningful on the host
51 * machine. In the current Linux implementation these mapping tables live
52 * inside the kernel; NetLabel provides a mechanism for user space applications
53 * to manage these mapping tables.
54 *
55 * NetLabel makes use of the Generic NETLINK mechanism as a transport layer to
56 * send messages between kernel and user space. The general format of a
57 * NetLabel message is shown below:
58 *
59 * +-----------------+-------------------+--------- --- -- -
60 * | struct nlmsghdr | struct genlmsghdr | payload
61 * +-----------------+-------------------+--------- --- -- -
62 *
63 * The 'nlmsghdr' and 'genlmsghdr' structs should be dealt with like normal.
64 * The payload is dependent on the subsystem specified in the
65 * 'nlmsghdr->nlmsg_type' and should be defined below, supporting functions
66 * should be defined in the corresponding net/netlabel/netlabel_<subsys>.h|c
67 * file. All of the fields in the NetLabel payload are NETLINK attributes, see
68 * the include/net/netlink.h file for more information on NETLINK attributes.
69 *
70 */
71
72/*
73 * NetLabel NETLINK protocol
74 */
75
76/* NetLabel NETLINK protocol version
77 * 1: initial version
78 * 2: added static labels for unlabeled connections
79 * 3: network selectors added to the NetLabel/LSM domain mapping and the
80 * CIPSO_V4_MAP_LOCAL CIPSO mapping was added
81 */
82#define NETLBL_PROTO_VERSION 3
83
84/* NetLabel NETLINK types/families */
85#define NETLBL_NLTYPE_NONE 0
86#define NETLBL_NLTYPE_MGMT 1
87#define NETLBL_NLTYPE_MGMT_NAME "NLBL_MGMT"
88#define NETLBL_NLTYPE_RIPSO 2
89#define NETLBL_NLTYPE_RIPSO_NAME "NLBL_RIPSO"
90#define NETLBL_NLTYPE_CIPSOV4 3
91#define NETLBL_NLTYPE_CIPSOV4_NAME "NLBL_CIPSOv4"
92#define NETLBL_NLTYPE_CIPSOV6 4
93#define NETLBL_NLTYPE_CIPSOV6_NAME "NLBL_CIPSOv6"
94#define NETLBL_NLTYPE_UNLABELED 5
95#define NETLBL_NLTYPE_UNLABELED_NAME "NLBL_UNLBL"
96#define NETLBL_NLTYPE_ADDRSELECT 6
97#define NETLBL_NLTYPE_ADDRSELECT_NAME "NLBL_ADRSEL"
98
99/*
100 * NetLabel - Kernel API for accessing the network packet label mappings.
101 *
102 * The following functions are provided for use by other kernel modules,
103 * specifically kernel LSM modules, to provide a consistent, transparent API
104 * for dealing with explicit packet labeling protocols such as CIPSO and
105 * RIPSO. The functions defined here are implemented in the
106 * net/netlabel/netlabel_kapi.c file.
107 *
108 */
109
110/* NetLabel audit information */
111struct netlbl_audit {
112 u32 secid;
113 uid_t loginuid;
114 u32 sessionid;
115};
116
117/*
118 * LSM security attributes
119 */
120
121/**
122 * struct netlbl_lsm_cache - NetLabel LSM security attribute cache
123 * @refcount: atomic reference counter
124 * @free: LSM supplied function to free the cache data
125 * @data: LSM supplied cache data
126 *
127 * Description:
128 * This structure is provided for LSMs which wish to make use of the NetLabel
129 * caching mechanism to store LSM specific data/attributes in the NetLabel
130 * cache. If the LSM has to perform a lot of translation from the NetLabel
131 * security attributes into it's own internal representation then the cache
132 * mechanism can provide a way to eliminate some or all of that translation
133 * overhead on a cache hit.
134 *
135 */
136struct netlbl_lsm_cache {
137 atomic_t refcount;
138 void (*free) (const void *data);
139 void *data;
140};
141
142/**
143 * struct netlbl_lsm_secattr_catmap - NetLabel LSM secattr category bitmap
144 * @startbit: the value of the lowest order bit in the bitmap
145 * @bitmap: the category bitmap
146 * @next: pointer to the next bitmap "node" or NULL
147 *
148 * Description:
149 * This structure is used to represent category bitmaps. Due to the large
150 * number of categories supported by most labeling protocols it is not
151 * practical to transfer a full bitmap internally so NetLabel adopts a sparse
152 * bitmap structure modeled after SELinux's ebitmap structure.
153 * The catmap bitmap field MUST be a power of two in length and large
154 * enough to hold at least 240 bits. Special care (i.e. check the code!)
155 * should be used when changing these values as the LSM implementation
156 * probably has functions which rely on the sizes of these types to speed
157 * processing.
158 *
159 */
160#define NETLBL_CATMAP_MAPTYPE u64
161#define NETLBL_CATMAP_MAPCNT 4
162#define NETLBL_CATMAP_MAPSIZE (sizeof(NETLBL_CATMAP_MAPTYPE) * 8)
163#define NETLBL_CATMAP_SIZE (NETLBL_CATMAP_MAPSIZE * \
164 NETLBL_CATMAP_MAPCNT)
165#define NETLBL_CATMAP_BIT (NETLBL_CATMAP_MAPTYPE)0x01
166struct netlbl_lsm_secattr_catmap {
167 u32 startbit;
168 NETLBL_CATMAP_MAPTYPE bitmap[NETLBL_CATMAP_MAPCNT];
169 struct netlbl_lsm_secattr_catmap *next;
170};
171
172/**
173 * struct netlbl_lsm_secattr - NetLabel LSM security attributes
174 * @flags: indicate structure attributes, see NETLBL_SECATTR_*
175 * @type: indicate the NLTYPE of the attributes
176 * @domain: the NetLabel LSM domain
177 * @cache: NetLabel LSM specific cache
178 * @attr.mls: MLS sensitivity label
179 * @attr.mls.cat: MLS category bitmap
180 * @attr.mls.lvl: MLS sensitivity level
181 * @attr.secid: LSM specific secid token
182 *
183 * Description:
184 * This structure is used to pass security attributes between NetLabel and the
185 * LSM modules. The flags field is used to specify which fields within the
186 * struct are valid and valid values can be created by bitwise OR'ing the
187 * NETLBL_SECATTR_* defines. The domain field is typically set by the LSM to
188 * specify domain specific configuration settings and is not usually used by
189 * NetLabel itself when returning security attributes to the LSM.
190 *
191 */
192struct netlbl_lsm_secattr {
193 u32 flags;
194 /* bitmap values for 'flags' */
195#define NETLBL_SECATTR_NONE 0x00000000
196#define NETLBL_SECATTR_DOMAIN 0x00000001
197#define NETLBL_SECATTR_DOMAIN_CPY (NETLBL_SECATTR_DOMAIN | \
198 NETLBL_SECATTR_FREE_DOMAIN)
199#define NETLBL_SECATTR_CACHE 0x00000002
200#define NETLBL_SECATTR_MLS_LVL 0x00000004
201#define NETLBL_SECATTR_MLS_CAT 0x00000008
202#define NETLBL_SECATTR_SECID 0x00000010
203 /* bitmap meta-values for 'flags' */
204#define NETLBL_SECATTR_FREE_DOMAIN 0x01000000
205#define NETLBL_SECATTR_CACHEABLE (NETLBL_SECATTR_MLS_LVL | \
206 NETLBL_SECATTR_MLS_CAT | \
207 NETLBL_SECATTR_SECID)
208 u32 type;
209 char *domain;
210 struct netlbl_lsm_cache *cache;
211 struct {
212 struct {
213 struct netlbl_lsm_secattr_catmap *cat;
214 u32 lvl;
215 } mls;
216 u32 secid;
217 } attr;
218};
219
220/*
221 * LSM security attribute operations (inline)
222 */
223
224/**
225 * netlbl_secattr_cache_alloc - Allocate and initialize a secattr cache
226 * @flags: the memory allocation flags
227 *
228 * Description:
229 * Allocate and initialize a netlbl_lsm_cache structure. Returns a pointer
230 * on success, NULL on failure.
231 *
232 */
233static inline struct netlbl_lsm_cache *netlbl_secattr_cache_alloc(gfp_t flags)
234{
235 struct netlbl_lsm_cache *cache;
236
237 cache = kzalloc(sizeof(*cache), flags);
238 if (cache)
239 atomic_set(&cache->refcount, 1);
240 return cache;
241}
242
243/**
244 * netlbl_secattr_cache_free - Frees a netlbl_lsm_cache struct
245 * @cache: the struct to free
246 *
247 * Description:
248 * Frees @secattr including all of the internal buffers.
249 *
250 */
251static inline void netlbl_secattr_cache_free(struct netlbl_lsm_cache *cache)
252{
253 if (!atomic_dec_and_test(&cache->refcount))
254 return;
255
256 if (cache->free)
257 cache->free(cache->data);
258 kfree(cache);
259}
260
261/**
262 * netlbl_secattr_catmap_alloc - Allocate a LSM secattr catmap
263 * @flags: memory allocation flags
264 *
265 * Description:
266 * Allocate memory for a LSM secattr catmap, returns a pointer on success, NULL
267 * on failure.
268 *
269 */
270static inline struct netlbl_lsm_secattr_catmap *netlbl_secattr_catmap_alloc(
271 gfp_t flags)
272{
273 return kzalloc(sizeof(struct netlbl_lsm_secattr_catmap), flags);
274}
275
276/**
277 * netlbl_secattr_catmap_free - Free a LSM secattr catmap
278 * @catmap: the category bitmap
279 *
280 * Description:
281 * Free a LSM secattr catmap.
282 *
283 */
284static inline void netlbl_secattr_catmap_free(
285 struct netlbl_lsm_secattr_catmap *catmap)
286{
287 struct netlbl_lsm_secattr_catmap *iter;
288
289 do {
290 iter = catmap;
291 catmap = catmap->next;
292 kfree(iter);
293 } while (catmap);
294}
295
296/**
297 * netlbl_secattr_init - Initialize a netlbl_lsm_secattr struct
298 * @secattr: the struct to initialize
299 *
300 * Description:
301 * Initialize an already allocated netlbl_lsm_secattr struct.
302 *
303 */
304static inline void netlbl_secattr_init(struct netlbl_lsm_secattr *secattr)
305{
306 memset(secattr, 0, sizeof(*secattr));
307}
308
309/**
310 * netlbl_secattr_destroy - Clears a netlbl_lsm_secattr struct
311 * @secattr: the struct to clear
312 *
313 * Description:
314 * Destroys the @secattr struct, including freeing all of the internal buffers.
315 * The struct must be reset with a call to netlbl_secattr_init() before reuse.
316 *
317 */
318static inline void netlbl_secattr_destroy(struct netlbl_lsm_secattr *secattr)
319{
320 if (secattr->flags & NETLBL_SECATTR_FREE_DOMAIN)
321 kfree(secattr->domain);
322 if (secattr->flags & NETLBL_SECATTR_CACHE)
323 netlbl_secattr_cache_free(secattr->cache);
324 if (secattr->flags & NETLBL_SECATTR_MLS_CAT)
325 netlbl_secattr_catmap_free(secattr->attr.mls.cat);
326}
327
328/**
329 * netlbl_secattr_alloc - Allocate and initialize a netlbl_lsm_secattr struct
330 * @flags: the memory allocation flags
331 *
332 * Description:
333 * Allocate and initialize a netlbl_lsm_secattr struct. Returns a valid
334 * pointer on success, or NULL on failure.
335 *
336 */
337static inline struct netlbl_lsm_secattr *netlbl_secattr_alloc(gfp_t flags)
338{
339 return kzalloc(sizeof(struct netlbl_lsm_secattr), flags);
340}
341
342/**
343 * netlbl_secattr_free - Frees a netlbl_lsm_secattr struct
344 * @secattr: the struct to free
345 *
346 * Description:
347 * Frees @secattr including all of the internal buffers.
348 *
349 */
350static inline void netlbl_secattr_free(struct netlbl_lsm_secattr *secattr)
351{
352 netlbl_secattr_destroy(secattr);
353 kfree(secattr);
354}
355
356#ifdef CONFIG_NETLABEL
357/*
358 * LSM configuration operations
359 */
360int netlbl_cfg_map_del(const char *domain,
361 u16 family,
362 const void *addr,
363 const void *mask,
364 struct netlbl_audit *audit_info);
365int netlbl_cfg_unlbl_map_add(const char *domain,
366 u16 family,
367 const void *addr,
368 const void *mask,
369 struct netlbl_audit *audit_info);
370int netlbl_cfg_unlbl_static_add(struct net *net,
371 const char *dev_name,
372 const void *addr,
373 const void *mask,
374 u16 family,
375 u32 secid,
376 struct netlbl_audit *audit_info);
377int netlbl_cfg_unlbl_static_del(struct net *net,
378 const char *dev_name,
379 const void *addr,
380 const void *mask,
381 u16 family,
382 struct netlbl_audit *audit_info);
383int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def,
384 struct netlbl_audit *audit_info);
385void netlbl_cfg_cipsov4_del(u32 doi, struct netlbl_audit *audit_info);
386int netlbl_cfg_cipsov4_map_add(u32 doi,
387 const char *domain,
388 const struct in_addr *addr,
389 const struct in_addr *mask,
390 struct netlbl_audit *audit_info);
391/*
392 * LSM security attribute operations
393 */
394int netlbl_secattr_catmap_walk(struct netlbl_lsm_secattr_catmap *catmap,
395 u32 offset);
396int netlbl_secattr_catmap_walk_rng(struct netlbl_lsm_secattr_catmap *catmap,
397 u32 offset);
398int netlbl_secattr_catmap_setbit(struct netlbl_lsm_secattr_catmap *catmap,
399 u32 bit,
400 gfp_t flags);
401int netlbl_secattr_catmap_setrng(struct netlbl_lsm_secattr_catmap *catmap,
402 u32 start,
403 u32 end,
404 gfp_t flags);
405
406/*
407 * LSM protocol operations (NetLabel LSM/kernel API)
408 */
409int netlbl_enabled(void);
410int netlbl_sock_setattr(struct sock *sk,
411 u16 family,
412 const struct netlbl_lsm_secattr *secattr);
413void netlbl_sock_delattr(struct sock *sk);
414int netlbl_sock_getattr(struct sock *sk,
415 struct netlbl_lsm_secattr *secattr);
416int netlbl_conn_setattr(struct sock *sk,
417 struct sockaddr *addr,
418 const struct netlbl_lsm_secattr *secattr);
419int netlbl_req_setattr(struct request_sock *req,
420 const struct netlbl_lsm_secattr *secattr);
421void netlbl_req_delattr(struct request_sock *req);
422int netlbl_skbuff_setattr(struct sk_buff *skb,
423 u16 family,
424 const struct netlbl_lsm_secattr *secattr);
425int netlbl_skbuff_getattr(const struct sk_buff *skb,
426 u16 family,
427 struct netlbl_lsm_secattr *secattr);
428void netlbl_skbuff_err(struct sk_buff *skb, int error, int gateway);
429
430/*
431 * LSM label mapping cache operations
432 */
433void netlbl_cache_invalidate(void);
434int netlbl_cache_add(const struct sk_buff *skb,
435 const struct netlbl_lsm_secattr *secattr);
436
437/*
438 * Protocol engine operations
439 */
440struct audit_buffer *netlbl_audit_start(int type,
441 struct netlbl_audit *audit_info);
442#else
443static inline int netlbl_cfg_map_del(const char *domain,
444 u16 family,
445 const void *addr,
446 const void *mask,
447 struct netlbl_audit *audit_info)
448{
449 return -ENOSYS;
450}
451static inline int netlbl_cfg_unlbl_map_add(const char *domain,
452 u16 family,
453 void *addr,
454 void *mask,
455 struct netlbl_audit *audit_info)
456{
457 return -ENOSYS;
458}
459static inline int netlbl_cfg_unlbl_static_add(struct net *net,
460 const char *dev_name,
461 const void *addr,
462 const void *mask,
463 u16 family,
464 u32 secid,
465 struct netlbl_audit *audit_info)
466{
467 return -ENOSYS;
468}
469static inline int netlbl_cfg_unlbl_static_del(struct net *net,
470 const char *dev_name,
471 const void *addr,
472 const void *mask,
473 u16 family,
474 struct netlbl_audit *audit_info)
475{
476 return -ENOSYS;
477}
478static inline int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def,
479 struct netlbl_audit *audit_info)
480{
481 return -ENOSYS;
482}
483static inline void netlbl_cfg_cipsov4_del(u32 doi,
484 struct netlbl_audit *audit_info)
485{
486 return;
487}
488static inline int netlbl_cfg_cipsov4_map_add(u32 doi,
489 const char *domain,
490 const struct in_addr *addr,
491 const struct in_addr *mask,
492 struct netlbl_audit *audit_info)
493{
494 return -ENOSYS;
495}
496static inline int netlbl_secattr_catmap_walk(
497 struct netlbl_lsm_secattr_catmap *catmap,
498 u32 offset)
499{
500 return -ENOENT;
501}
502static inline int netlbl_secattr_catmap_walk_rng(
503 struct netlbl_lsm_secattr_catmap *catmap,
504 u32 offset)
505{
506 return -ENOENT;
507}
508static inline int netlbl_secattr_catmap_setbit(
509 struct netlbl_lsm_secattr_catmap *catmap,
510 u32 bit,
511 gfp_t flags)
512{
513 return 0;
514}
515static inline int netlbl_secattr_catmap_setrng(
516 struct netlbl_lsm_secattr_catmap *catmap,
517 u32 start,
518 u32 end,
519 gfp_t flags)
520{
521 return 0;
522}
523static inline int netlbl_enabled(void)
524{
525 return 0;
526}
527static inline int netlbl_sock_setattr(struct sock *sk,
528 u16 family,
529 const struct netlbl_lsm_secattr *secattr)
530{
531 return -ENOSYS;
532}
533static inline void netlbl_sock_delattr(struct sock *sk)
534{
535}
536static inline int netlbl_sock_getattr(struct sock *sk,
537 struct netlbl_lsm_secattr *secattr)
538{
539 return -ENOSYS;
540}
541static inline int netlbl_conn_setattr(struct sock *sk,
542 struct sockaddr *addr,
543 const struct netlbl_lsm_secattr *secattr)
544{
545 return -ENOSYS;
546}
547static inline int netlbl_req_setattr(struct request_sock *req,
548 const struct netlbl_lsm_secattr *secattr)
549{
550 return -ENOSYS;
551}
552static inline void netlbl_req_delattr(struct request_sock *req)
553{
554 return;
555}
556static inline int netlbl_skbuff_setattr(struct sk_buff *skb,
557 u16 family,
558 const struct netlbl_lsm_secattr *secattr)
559{
560 return -ENOSYS;
561}
562static inline int netlbl_skbuff_getattr(const struct sk_buff *skb,
563 u16 family,
564 struct netlbl_lsm_secattr *secattr)
565{
566 return -ENOSYS;
567}
568static inline void netlbl_skbuff_err(struct sk_buff *skb,
569 int error,
570 int gateway)
571{
572 return;
573}
574static inline void netlbl_cache_invalidate(void)
575{
576 return;
577}
578static inline int netlbl_cache_add(const struct sk_buff *skb,
579 const struct netlbl_lsm_secattr *secattr)
580{
581 return 0;
582}
583static inline struct audit_buffer *netlbl_audit_start(int type,
584 struct netlbl_audit *audit_info)
585{
586 return NULL;
587}
588#endif /* CONFIG_NETLABEL */
589
590#endif /* _NETLABEL_H */