1 // SPDX-License-Identifier: GPL-2.0-or-later
5 * This file defines the kernel API for the NetLabel system. The NetLabel
6 * system manages static and dynamic label mappings for network protocols such
9 * Author: Paul Moore <paul@paul-moore.com>
13 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008
16 #include <linux/init.h>
17 #include <linux/types.h>
18 #include <linux/slab.h>
19 #include <linux/audit.h>
21 #include <linux/in6.h>
24 #include <net/netlabel.h>
25 #include <net/cipso_ipv4.h>
26 #include <net/calipso.h>
28 #include <linux/atomic.h>
30 #include "netlabel_domainhash.h"
31 #include "netlabel_unlabeled.h"
32 #include "netlabel_cipso_v4.h"
33 #include "netlabel_calipso.h"
34 #include "netlabel_user.h"
35 #include "netlabel_mgmt.h"
36 #include "netlabel_addrlist.h"
39 * Configuration Functions
43 * netlbl_cfg_map_del - Remove a NetLabel/LSM domain mapping
44 * @domain: the domain mapping to remove
45 * @family: address family
47 * @mask: IP address mask
48 * @audit_info: NetLabel audit information
51 * Removes a NetLabel/LSM domain mapping. A @domain value of NULL causes the
52 * default domain mapping to be removed. Returns zero on success, negative
56 int netlbl_cfg_map_del(const char *domain
,
60 struct netlbl_audit
*audit_info
)
62 if (addr
== NULL
&& mask
== NULL
) {
63 return netlbl_domhsh_remove(domain
, family
, audit_info
);
64 } else if (addr
!= NULL
&& mask
!= NULL
) {
67 return netlbl_domhsh_remove_af4(domain
, addr
, mask
,
69 #if IS_ENABLED(CONFIG_IPV6)
71 return netlbl_domhsh_remove_af6(domain
, addr
, mask
,
82 * netlbl_cfg_unlbl_map_add - Add a new unlabeled mapping
83 * @domain: the domain mapping to add
84 * @family: address family
86 * @mask: IP address mask
87 * @audit_info: NetLabel audit information
90 * Adds a new unlabeled NetLabel/LSM domain mapping. A @domain value of NULL
91 * causes a new default domain mapping to be added. Returns zero on success,
92 * negative values on failure.
95 int netlbl_cfg_unlbl_map_add(const char *domain
,
99 struct netlbl_audit
*audit_info
)
101 int ret_val
= -ENOMEM
;
102 struct netlbl_dom_map
*entry
;
103 struct netlbl_domaddr_map
*addrmap
= NULL
;
104 struct netlbl_domaddr4_map
*map4
= NULL
;
105 struct netlbl_domaddr6_map
*map6
= NULL
;
107 entry
= kzalloc(sizeof(*entry
), GFP_ATOMIC
);
110 if (domain
!= NULL
) {
111 entry
->domain
= kstrdup(domain
, GFP_ATOMIC
);
112 if (entry
->domain
== NULL
)
113 goto cfg_unlbl_map_add_failure
;
115 entry
->family
= family
;
117 if (addr
== NULL
&& mask
== NULL
)
118 entry
->def
.type
= NETLBL_NLTYPE_UNLABELED
;
119 else if (addr
!= NULL
&& mask
!= NULL
) {
120 addrmap
= kzalloc(sizeof(*addrmap
), GFP_ATOMIC
);
122 goto cfg_unlbl_map_add_failure
;
123 INIT_LIST_HEAD(&addrmap
->list4
);
124 INIT_LIST_HEAD(&addrmap
->list6
);
128 const struct in_addr
*addr4
= addr
;
129 const struct in_addr
*mask4
= mask
;
130 map4
= kzalloc(sizeof(*map4
), GFP_ATOMIC
);
132 goto cfg_unlbl_map_add_failure
;
133 map4
->def
.type
= NETLBL_NLTYPE_UNLABELED
;
134 map4
->list
.addr
= addr4
->s_addr
& mask4
->s_addr
;
135 map4
->list
.mask
= mask4
->s_addr
;
136 map4
->list
.valid
= 1;
137 ret_val
= netlbl_af4list_add(&map4
->list
,
140 goto cfg_unlbl_map_add_failure
;
143 #if IS_ENABLED(CONFIG_IPV6)
145 const struct in6_addr
*addr6
= addr
;
146 const struct in6_addr
*mask6
= mask
;
147 map6
= kzalloc(sizeof(*map6
), GFP_ATOMIC
);
149 goto cfg_unlbl_map_add_failure
;
150 map6
->def
.type
= NETLBL_NLTYPE_UNLABELED
;
151 map6
->list
.addr
= *addr6
;
152 map6
->list
.addr
.s6_addr32
[0] &= mask6
->s6_addr32
[0];
153 map6
->list
.addr
.s6_addr32
[1] &= mask6
->s6_addr32
[1];
154 map6
->list
.addr
.s6_addr32
[2] &= mask6
->s6_addr32
[2];
155 map6
->list
.addr
.s6_addr32
[3] &= mask6
->s6_addr32
[3];
156 map6
->list
.mask
= *mask6
;
157 map6
->list
.valid
= 1;
158 ret_val
= netlbl_af6list_add(&map6
->list
,
161 goto cfg_unlbl_map_add_failure
;
166 goto cfg_unlbl_map_add_failure
;
169 entry
->def
.addrsel
= addrmap
;
170 entry
->def
.type
= NETLBL_NLTYPE_ADDRSELECT
;
173 goto cfg_unlbl_map_add_failure
;
176 ret_val
= netlbl_domhsh_add(entry
, audit_info
);
178 goto cfg_unlbl_map_add_failure
;
182 cfg_unlbl_map_add_failure
:
183 kfree(entry
->domain
);
193 * netlbl_cfg_unlbl_static_add - Adds a new static label
194 * @net: network namespace
195 * @dev_name: interface name
196 * @addr: IP address in network byte order (struct in[6]_addr)
197 * @mask: address mask in network byte order (struct in[6]_addr)
198 * @family: address family
199 * @secid: LSM secid value for the entry
200 * @audit_info: NetLabel audit information
203 * Adds a new NetLabel static label to be used when protocol provided labels
204 * are not present on incoming traffic. If @dev_name is NULL then the default
205 * interface will be used. Returns zero on success, negative values on failure.
208 int netlbl_cfg_unlbl_static_add(struct net
*net
,
209 const char *dev_name
,
214 struct netlbl_audit
*audit_info
)
220 addr_len
= sizeof(struct in_addr
);
222 #if IS_ENABLED(CONFIG_IPV6)
224 addr_len
= sizeof(struct in6_addr
);
228 return -EPFNOSUPPORT
;
231 return netlbl_unlhsh_add(net
,
232 dev_name
, addr
, mask
, addr_len
,
237 * netlbl_cfg_unlbl_static_del - Removes an existing static label
238 * @net: network namespace
239 * @dev_name: interface name
240 * @addr: IP address in network byte order (struct in[6]_addr)
241 * @mask: address mask in network byte order (struct in[6]_addr)
242 * @family: address family
243 * @audit_info: NetLabel audit information
246 * Removes an existing NetLabel static label used when protocol provided labels
247 * are not present on incoming traffic. If @dev_name is NULL then the default
248 * interface will be used. Returns zero on success, negative values on failure.
251 int netlbl_cfg_unlbl_static_del(struct net
*net
,
252 const char *dev_name
,
256 struct netlbl_audit
*audit_info
)
262 addr_len
= sizeof(struct in_addr
);
264 #if IS_ENABLED(CONFIG_IPV6)
266 addr_len
= sizeof(struct in6_addr
);
270 return -EPFNOSUPPORT
;
273 return netlbl_unlhsh_remove(net
,
274 dev_name
, addr
, mask
, addr_len
,
279 * netlbl_cfg_cipsov4_add - Add a new CIPSOv4 DOI definition
280 * @doi_def: CIPSO DOI definition
281 * @audit_info: NetLabel audit information
284 * Add a new CIPSO DOI definition as defined by @doi_def. Returns zero on
285 * success and negative values on failure.
288 int netlbl_cfg_cipsov4_add(struct cipso_v4_doi
*doi_def
,
289 struct netlbl_audit
*audit_info
)
291 return cipso_v4_doi_add(doi_def
, audit_info
);
295 * netlbl_cfg_cipsov4_del - Remove an existing CIPSOv4 DOI definition
297 * @audit_info: NetLabel audit information
300 * Remove an existing CIPSO DOI definition matching @doi. Returns zero on
301 * success and negative values on failure.
304 void netlbl_cfg_cipsov4_del(u32 doi
, struct netlbl_audit
*audit_info
)
306 cipso_v4_doi_remove(doi
, audit_info
);
310 * netlbl_cfg_cipsov4_map_add - Add a new CIPSOv4 DOI mapping
311 * @doi: the CIPSO DOI
312 * @domain: the domain mapping to add
314 * @mask: IP address mask
315 * @audit_info: NetLabel audit information
318 * Add a new NetLabel/LSM domain mapping for the given CIPSO DOI to the NetLabel
319 * subsystem. A @domain value of NULL adds a new default domain mapping.
320 * Returns zero on success, negative values on failure.
323 int netlbl_cfg_cipsov4_map_add(u32 doi
,
325 const struct in_addr
*addr
,
326 const struct in_addr
*mask
,
327 struct netlbl_audit
*audit_info
)
329 int ret_val
= -ENOMEM
;
330 struct cipso_v4_doi
*doi_def
;
331 struct netlbl_dom_map
*entry
;
332 struct netlbl_domaddr_map
*addrmap
= NULL
;
333 struct netlbl_domaddr4_map
*addrinfo
= NULL
;
335 doi_def
= cipso_v4_doi_getdef(doi
);
339 entry
= kzalloc(sizeof(*entry
), GFP_ATOMIC
);
342 entry
->family
= AF_INET
;
343 if (domain
!= NULL
) {
344 entry
->domain
= kstrdup(domain
, GFP_ATOMIC
);
345 if (entry
->domain
== NULL
)
349 if (addr
== NULL
&& mask
== NULL
) {
350 entry
->def
.cipso
= doi_def
;
351 entry
->def
.type
= NETLBL_NLTYPE_CIPSOV4
;
352 } else if (addr
!= NULL
&& mask
!= NULL
) {
353 addrmap
= kzalloc(sizeof(*addrmap
), GFP_ATOMIC
);
356 INIT_LIST_HEAD(&addrmap
->list4
);
357 INIT_LIST_HEAD(&addrmap
->list6
);
359 addrinfo
= kzalloc(sizeof(*addrinfo
), GFP_ATOMIC
);
360 if (addrinfo
== NULL
)
362 addrinfo
->def
.cipso
= doi_def
;
363 addrinfo
->def
.type
= NETLBL_NLTYPE_CIPSOV4
;
364 addrinfo
->list
.addr
= addr
->s_addr
& mask
->s_addr
;
365 addrinfo
->list
.mask
= mask
->s_addr
;
366 addrinfo
->list
.valid
= 1;
367 ret_val
= netlbl_af4list_add(&addrinfo
->list
, &addrmap
->list4
);
369 goto cfg_cipsov4_map_add_failure
;
371 entry
->def
.addrsel
= addrmap
;
372 entry
->def
.type
= NETLBL_NLTYPE_ADDRSELECT
;
378 ret_val
= netlbl_domhsh_add(entry
, audit_info
);
380 goto cfg_cipsov4_map_add_failure
;
384 cfg_cipsov4_map_add_failure
:
389 kfree(entry
->domain
);
393 cipso_v4_doi_putdef(doi_def
);
398 * netlbl_cfg_calipso_add - Add a new CALIPSO DOI definition
399 * @doi_def: CALIPSO DOI definition
400 * @audit_info: NetLabel audit information
403 * Add a new CALIPSO DOI definition as defined by @doi_def. Returns zero on
404 * success and negative values on failure.
407 int netlbl_cfg_calipso_add(struct calipso_doi
*doi_def
,
408 struct netlbl_audit
*audit_info
)
410 #if IS_ENABLED(CONFIG_IPV6)
411 return calipso_doi_add(doi_def
, audit_info
);
418 * netlbl_cfg_calipso_del - Remove an existing CALIPSO DOI definition
420 * @audit_info: NetLabel audit information
423 * Remove an existing CALIPSO DOI definition matching @doi. Returns zero on
424 * success and negative values on failure.
427 void netlbl_cfg_calipso_del(u32 doi
, struct netlbl_audit
*audit_info
)
429 #if IS_ENABLED(CONFIG_IPV6)
430 calipso_doi_remove(doi
, audit_info
);
435 * netlbl_cfg_calipso_map_add - Add a new CALIPSO DOI mapping
436 * @doi: the CALIPSO DOI
437 * @domain: the domain mapping to add
439 * @mask: IP address mask
440 * @audit_info: NetLabel audit information
443 * Add a new NetLabel/LSM domain mapping for the given CALIPSO DOI to the
444 * NetLabel subsystem. A @domain value of NULL adds a new default domain
445 * mapping. Returns zero on success, negative values on failure.
448 int netlbl_cfg_calipso_map_add(u32 doi
,
450 const struct in6_addr
*addr
,
451 const struct in6_addr
*mask
,
452 struct netlbl_audit
*audit_info
)
454 #if IS_ENABLED(CONFIG_IPV6)
455 int ret_val
= -ENOMEM
;
456 struct calipso_doi
*doi_def
;
457 struct netlbl_dom_map
*entry
;
458 struct netlbl_domaddr_map
*addrmap
= NULL
;
459 struct netlbl_domaddr6_map
*addrinfo
= NULL
;
461 doi_def
= calipso_doi_getdef(doi
);
465 entry
= kzalloc(sizeof(*entry
), GFP_ATOMIC
);
468 entry
->family
= AF_INET6
;
469 if (domain
!= NULL
) {
470 entry
->domain
= kstrdup(domain
, GFP_ATOMIC
);
471 if (entry
->domain
== NULL
)
475 if (addr
== NULL
&& mask
== NULL
) {
476 entry
->def
.calipso
= doi_def
;
477 entry
->def
.type
= NETLBL_NLTYPE_CALIPSO
;
478 } else if (addr
!= NULL
&& mask
!= NULL
) {
479 addrmap
= kzalloc(sizeof(*addrmap
), GFP_ATOMIC
);
482 INIT_LIST_HEAD(&addrmap
->list4
);
483 INIT_LIST_HEAD(&addrmap
->list6
);
485 addrinfo
= kzalloc(sizeof(*addrinfo
), GFP_ATOMIC
);
486 if (addrinfo
== NULL
)
488 addrinfo
->def
.calipso
= doi_def
;
489 addrinfo
->def
.type
= NETLBL_NLTYPE_CALIPSO
;
490 addrinfo
->list
.addr
= *addr
;
491 addrinfo
->list
.addr
.s6_addr32
[0] &= mask
->s6_addr32
[0];
492 addrinfo
->list
.addr
.s6_addr32
[1] &= mask
->s6_addr32
[1];
493 addrinfo
->list
.addr
.s6_addr32
[2] &= mask
->s6_addr32
[2];
494 addrinfo
->list
.addr
.s6_addr32
[3] &= mask
->s6_addr32
[3];
495 addrinfo
->list
.mask
= *mask
;
496 addrinfo
->list
.valid
= 1;
497 ret_val
= netlbl_af6list_add(&addrinfo
->list
, &addrmap
->list6
);
499 goto cfg_calipso_map_add_failure
;
501 entry
->def
.addrsel
= addrmap
;
502 entry
->def
.type
= NETLBL_NLTYPE_ADDRSELECT
;
508 ret_val
= netlbl_domhsh_add(entry
, audit_info
);
510 goto cfg_calipso_map_add_failure
;
514 cfg_calipso_map_add_failure
:
519 kfree(entry
->domain
);
523 calipso_doi_putdef(doi_def
);
531 * Security Attribute Functions
534 #define _CM_F_NONE 0x00000000
535 #define _CM_F_ALLOC 0x00000001
536 #define _CM_F_WALK 0x00000002
539 * _netlbl_catmap_getnode - Get a individual node from a catmap
540 * @catmap: pointer to the category bitmap
541 * @offset: the requested offset
542 * @cm_flags: catmap flags, see _CM_F_*
543 * @gfp_flags: memory allocation flags
546 * Iterate through the catmap looking for the node associated with @offset.
547 * If the _CM_F_ALLOC flag is set in @cm_flags and there is no associated node,
548 * one will be created and inserted into the catmap. If the _CM_F_WALK flag is
549 * set in @cm_flags and there is no associated node, the next highest node will
550 * be returned. Returns a pointer to the node on success, NULL on failure.
553 static struct netlbl_lsm_catmap
*_netlbl_catmap_getnode(
554 struct netlbl_lsm_catmap
**catmap
,
556 unsigned int cm_flags
,
559 struct netlbl_lsm_catmap
*iter
= *catmap
;
560 struct netlbl_lsm_catmap
*prev
= NULL
;
563 goto catmap_getnode_alloc
;
564 if (offset
< iter
->startbit
)
565 goto catmap_getnode_walk
;
566 while (iter
&& offset
>= (iter
->startbit
+ NETLBL_CATMAP_SIZE
)) {
570 if (iter
== NULL
|| offset
< iter
->startbit
)
571 goto catmap_getnode_walk
;
576 if (cm_flags
& _CM_F_WALK
)
578 catmap_getnode_alloc
:
579 if (!(cm_flags
& _CM_F_ALLOC
))
582 iter
= netlbl_catmap_alloc(gfp_flags
);
585 iter
->startbit
= offset
& ~(NETLBL_CATMAP_SIZE
- 1);
588 iter
->next
= *catmap
;
591 iter
->next
= prev
->next
;
599 * netlbl_catmap_walk - Walk a LSM secattr catmap looking for a bit
600 * @catmap: the category bitmap
601 * @offset: the offset to start searching at, in bits
604 * This function walks a LSM secattr category bitmap starting at @offset and
605 * returns the spot of the first set bit or -ENOENT if no bits are set.
608 int netlbl_catmap_walk(struct netlbl_lsm_catmap
*catmap
, u32 offset
)
610 struct netlbl_lsm_catmap
*iter
;
613 NETLBL_CATMAP_MAPTYPE bitmap
;
615 iter
= _netlbl_catmap_getnode(&catmap
, offset
, _CM_F_WALK
, 0);
618 if (offset
> iter
->startbit
) {
619 offset
-= iter
->startbit
;
620 idx
= offset
/ NETLBL_CATMAP_MAPSIZE
;
621 bit
= offset
% NETLBL_CATMAP_MAPSIZE
;
626 bitmap
= iter
->bitmap
[idx
] >> bit
;
630 while ((bitmap
& NETLBL_CATMAP_BIT
) == 0) {
634 return iter
->startbit
+
635 (NETLBL_CATMAP_MAPSIZE
* idx
) + bit
;
637 if (++idx
>= NETLBL_CATMAP_MAPCNT
) {
638 if (iter
->next
!= NULL
) {
644 bitmap
= iter
->bitmap
[idx
];
650 EXPORT_SYMBOL(netlbl_catmap_walk
);
653 * netlbl_catmap_walkrng - Find the end of a string of set bits
654 * @catmap: the category bitmap
655 * @offset: the offset to start searching at, in bits
658 * This function walks a LSM secattr category bitmap starting at @offset and
659 * returns the spot of the first cleared bit or -ENOENT if the offset is past
660 * the end of the bitmap.
663 int netlbl_catmap_walkrng(struct netlbl_lsm_catmap
*catmap
, u32 offset
)
665 struct netlbl_lsm_catmap
*iter
;
666 struct netlbl_lsm_catmap
*prev
= NULL
;
669 NETLBL_CATMAP_MAPTYPE bitmask
;
670 NETLBL_CATMAP_MAPTYPE bitmap
;
672 iter
= _netlbl_catmap_getnode(&catmap
, offset
, _CM_F_WALK
, 0);
675 if (offset
> iter
->startbit
) {
676 offset
-= iter
->startbit
;
677 idx
= offset
/ NETLBL_CATMAP_MAPSIZE
;
678 bit
= offset
% NETLBL_CATMAP_MAPSIZE
;
683 bitmask
= NETLBL_CATMAP_BIT
<< bit
;
686 bitmap
= iter
->bitmap
[idx
];
687 while (bitmask
!= 0 && (bitmap
& bitmask
) != 0) {
692 if (prev
&& idx
== 0 && bit
== 0)
693 return prev
->startbit
+ NETLBL_CATMAP_SIZE
- 1;
694 else if (bitmask
!= 0)
695 return iter
->startbit
+
696 (NETLBL_CATMAP_MAPSIZE
* idx
) + bit
- 1;
697 else if (++idx
>= NETLBL_CATMAP_MAPCNT
) {
698 if (iter
->next
== NULL
)
699 return iter
->startbit
+ NETLBL_CATMAP_SIZE
- 1;
704 bitmask
= NETLBL_CATMAP_BIT
;
712 * netlbl_catmap_getlong - Export an unsigned long bitmap
713 * @catmap: pointer to the category bitmap
714 * @offset: pointer to the requested offset
715 * @bitmap: the exported bitmap
718 * Export a bitmap with an offset greater than or equal to @offset and return
719 * it in @bitmap. The @offset must be aligned to an unsigned long and will be
720 * updated on return if different from what was requested; if the catmap is
721 * empty at the requested offset and beyond, the @offset is set to (u32)-1.
722 * Returns zero on sucess, negative values on failure.
725 int netlbl_catmap_getlong(struct netlbl_lsm_catmap
*catmap
,
727 unsigned long *bitmap
)
729 struct netlbl_lsm_catmap
*iter
;
733 /* only allow aligned offsets */
734 if ((off
& (BITS_PER_LONG
- 1)) != 0)
737 /* a null catmap is equivalent to an empty one */
743 if (off
< catmap
->startbit
) {
744 off
= catmap
->startbit
;
747 iter
= _netlbl_catmap_getnode(&catmap
, off
, _CM_F_WALK
, 0);
753 if (off
< iter
->startbit
) {
754 *offset
= iter
->startbit
;
757 off
-= iter
->startbit
;
758 idx
= off
/ NETLBL_CATMAP_MAPSIZE
;
759 *bitmap
= iter
->bitmap
[idx
] >> (off
% NETLBL_CATMAP_MAPSIZE
);
765 * netlbl_catmap_setbit - Set a bit in a LSM secattr catmap
766 * @catmap: pointer to the category bitmap
767 * @bit: the bit to set
768 * @flags: memory allocation flags
771 * Set the bit specified by @bit in @catmap. Returns zero on success,
772 * negative values on failure.
775 int netlbl_catmap_setbit(struct netlbl_lsm_catmap
**catmap
,
779 struct netlbl_lsm_catmap
*iter
;
782 iter
= _netlbl_catmap_getnode(catmap
, bit
, _CM_F_ALLOC
, flags
);
786 bit
-= iter
->startbit
;
787 idx
= bit
/ NETLBL_CATMAP_MAPSIZE
;
788 iter
->bitmap
[idx
] |= NETLBL_CATMAP_BIT
<< (bit
% NETLBL_CATMAP_MAPSIZE
);
792 EXPORT_SYMBOL(netlbl_catmap_setbit
);
795 * netlbl_catmap_setrng - Set a range of bits in a LSM secattr catmap
796 * @catmap: pointer to the category bitmap
797 * @start: the starting bit
798 * @end: the last bit in the string
799 * @flags: memory allocation flags
802 * Set a range of bits, starting at @start and ending with @end. Returns zero
803 * on success, negative values on failure.
806 int netlbl_catmap_setrng(struct netlbl_lsm_catmap
**catmap
,
814 while (rc
== 0 && spot
<= end
) {
815 if (((spot
& (BITS_PER_LONG
- 1)) == 0) &&
816 ((end
- spot
) > BITS_PER_LONG
)) {
817 rc
= netlbl_catmap_setlong(catmap
,
821 spot
+= BITS_PER_LONG
;
823 rc
= netlbl_catmap_setbit(catmap
, spot
++, flags
);
830 * netlbl_catmap_setlong - Import an unsigned long bitmap
831 * @catmap: pointer to the category bitmap
832 * @offset: offset to the start of the imported bitmap
833 * @bitmap: the bitmap to import
834 * @flags: memory allocation flags
837 * Import the bitmap specified in @bitmap into @catmap, using the offset
838 * in @offset. The offset must be aligned to an unsigned long. Returns zero
839 * on success, negative values on failure.
842 int netlbl_catmap_setlong(struct netlbl_lsm_catmap
**catmap
,
844 unsigned long bitmap
,
847 struct netlbl_lsm_catmap
*iter
;
850 /* only allow aligned offsets */
851 if ((offset
& (BITS_PER_LONG
- 1)) != 0)
854 iter
= _netlbl_catmap_getnode(catmap
, offset
, _CM_F_ALLOC
, flags
);
858 offset
-= iter
->startbit
;
859 idx
= offset
/ NETLBL_CATMAP_MAPSIZE
;
860 iter
->bitmap
[idx
] |= bitmap
<< (offset
% NETLBL_CATMAP_MAPSIZE
);
869 * netlbl_bitmap_walk - Walk a bitmap looking for a bit
870 * @bitmap: the bitmap
871 * @bitmap_len: length in bits
872 * @offset: starting offset
873 * @state: if non-zero, look for a set (1) bit else look for a cleared (0) bit
876 * Starting at @offset, walk the bitmap from left to right until either the
877 * desired bit is found or we reach the end. Return the bit offset, -1 if
878 * not found, or -2 if error.
880 int netlbl_bitmap_walk(const unsigned char *bitmap
, u32 bitmap_len
,
881 u32 offset
, u8 state
)
885 unsigned char bitmask
;
888 byte_offset
= offset
/ 8;
889 byte
= bitmap
[byte_offset
];
891 bitmask
= 0x80 >> (offset
% 8);
893 while (bit_spot
< bitmap_len
) {
894 if ((state
&& (byte
& bitmask
) == bitmask
) ||
895 (state
== 0 && (byte
& bitmask
) == 0))
898 if (++bit_spot
>= bitmap_len
)
902 byte
= bitmap
[++byte_offset
];
909 EXPORT_SYMBOL(netlbl_bitmap_walk
);
912 * netlbl_bitmap_setbit - Sets a single bit in a bitmap
913 * @bitmap: the bitmap
915 * @state: if non-zero, set the bit (1) else clear the bit (0)
918 * Set a single bit in the bitmask. Returns zero on success, negative values
921 void netlbl_bitmap_setbit(unsigned char *bitmap
, u32 bit
, u8 state
)
926 /* gcc always rounds to zero when doing integer division */
928 bitmask
= 0x80 >> (bit
% 8);
930 bitmap
[byte_spot
] |= bitmask
;
932 bitmap
[byte_spot
] &= ~bitmask
;
934 EXPORT_SYMBOL(netlbl_bitmap_setbit
);
941 * netlbl_enabled - Determine if the NetLabel subsystem is enabled
944 * The LSM can use this function to determine if it should use NetLabel
945 * security attributes in it's enforcement mechanism. Currently, NetLabel is
946 * considered to be enabled when it's configuration contains a valid setup for
947 * at least one labeled protocol (i.e. NetLabel can understand incoming
948 * labeled packets of at least one type); otherwise NetLabel is considered to
952 int netlbl_enabled(void)
954 /* At some point we probably want to expose this mechanism to the user
955 * as well so that admins can toggle NetLabel regardless of the
957 return (atomic_read(&netlabel_mgmt_protocount
) > 0);
961 * netlbl_sock_setattr - Label a socket using the correct protocol
962 * @sk: the socket to label
963 * @family: protocol family
964 * @secattr: the security attributes
967 * Attach the correct label to the given socket using the security attributes
968 * specified in @secattr. This function requires exclusive access to @sk,
969 * which means it either needs to be in the process of being created or locked.
970 * Returns zero on success, -EDESTADDRREQ if the domain is configured to use
971 * network address selectors (can't blindly label the socket), and negative
972 * values on all other failures.
975 int netlbl_sock_setattr(struct sock
*sk
,
977 const struct netlbl_lsm_secattr
*secattr
)
980 struct netlbl_dom_map
*dom_entry
;
983 dom_entry
= netlbl_domhsh_getentry(secattr
->domain
, family
);
984 if (dom_entry
== NULL
) {
986 goto socket_setattr_return
;
990 switch (dom_entry
->def
.type
) {
991 case NETLBL_NLTYPE_ADDRSELECT
:
992 ret_val
= -EDESTADDRREQ
;
994 case NETLBL_NLTYPE_CIPSOV4
:
995 ret_val
= cipso_v4_sock_setattr(sk
,
996 dom_entry
->def
.cipso
,
999 case NETLBL_NLTYPE_UNLABELED
:
1006 #if IS_ENABLED(CONFIG_IPV6)
1008 switch (dom_entry
->def
.type
) {
1009 case NETLBL_NLTYPE_ADDRSELECT
:
1010 ret_val
= -EDESTADDRREQ
;
1012 case NETLBL_NLTYPE_CALIPSO
:
1013 ret_val
= calipso_sock_setattr(sk
,
1014 dom_entry
->def
.calipso
,
1017 case NETLBL_NLTYPE_UNLABELED
:
1026 ret_val
= -EPROTONOSUPPORT
;
1029 socket_setattr_return
:
1035 * netlbl_sock_delattr - Delete all the NetLabel labels on a socket
1039 * Remove all the NetLabel labeling from @sk. The caller is responsible for
1040 * ensuring that @sk is locked.
1043 void netlbl_sock_delattr(struct sock
*sk
)
1045 switch (sk
->sk_family
) {
1047 cipso_v4_sock_delattr(sk
);
1049 #if IS_ENABLED(CONFIG_IPV6)
1051 calipso_sock_delattr(sk
);
1058 * netlbl_sock_getattr - Determine the security attributes of a sock
1060 * @secattr: the security attributes
1063 * Examines the given sock to see if any NetLabel style labeling has been
1064 * applied to the sock, if so it parses the socket label and returns the
1065 * security attributes in @secattr. Returns zero on success, negative values
1069 int netlbl_sock_getattr(struct sock
*sk
,
1070 struct netlbl_lsm_secattr
*secattr
)
1074 switch (sk
->sk_family
) {
1076 ret_val
= cipso_v4_sock_getattr(sk
, secattr
);
1078 #if IS_ENABLED(CONFIG_IPV6)
1080 ret_val
= calipso_sock_getattr(sk
, secattr
);
1084 ret_val
= -EPROTONOSUPPORT
;
1091 * netlbl_conn_setattr - Label a connected socket using the correct protocol
1092 * @sk: the socket to label
1093 * @addr: the destination address
1094 * @secattr: the security attributes
1097 * Attach the correct label to the given connected socket using the security
1098 * attributes specified in @secattr. The caller is responsible for ensuring
1099 * that @sk is locked. Returns zero on success, negative values on failure.
1102 int netlbl_conn_setattr(struct sock
*sk
,
1103 struct sockaddr
*addr
,
1104 const struct netlbl_lsm_secattr
*secattr
)
1107 struct sockaddr_in
*addr4
;
1108 #if IS_ENABLED(CONFIG_IPV6)
1109 struct sockaddr_in6
*addr6
;
1111 struct netlbl_dommap_def
*entry
;
1114 switch (addr
->sa_family
) {
1116 addr4
= (struct sockaddr_in
*)addr
;
1117 entry
= netlbl_domhsh_getentry_af4(secattr
->domain
,
1118 addr4
->sin_addr
.s_addr
);
1119 if (entry
== NULL
) {
1121 goto conn_setattr_return
;
1123 switch (entry
->type
) {
1124 case NETLBL_NLTYPE_CIPSOV4
:
1125 ret_val
= cipso_v4_sock_setattr(sk
,
1126 entry
->cipso
, secattr
);
1128 case NETLBL_NLTYPE_UNLABELED
:
1129 /* just delete the protocols we support for right now
1130 * but we could remove other protocols if needed */
1131 netlbl_sock_delattr(sk
);
1138 #if IS_ENABLED(CONFIG_IPV6)
1140 addr6
= (struct sockaddr_in6
*)addr
;
1141 entry
= netlbl_domhsh_getentry_af6(secattr
->domain
,
1143 if (entry
== NULL
) {
1145 goto conn_setattr_return
;
1147 switch (entry
->type
) {
1148 case NETLBL_NLTYPE_CALIPSO
:
1149 ret_val
= calipso_sock_setattr(sk
,
1150 entry
->calipso
, secattr
);
1152 case NETLBL_NLTYPE_UNLABELED
:
1153 /* just delete the protocols we support for right now
1154 * but we could remove other protocols if needed */
1155 netlbl_sock_delattr(sk
);
1164 ret_val
= -EPROTONOSUPPORT
;
1167 conn_setattr_return
:
1173 * netlbl_req_setattr - Label a request socket using the correct protocol
1174 * @req: the request socket to label
1175 * @secattr: the security attributes
1178 * Attach the correct label to the given socket using the security attributes
1179 * specified in @secattr. Returns zero on success, negative values on failure.
1182 int netlbl_req_setattr(struct request_sock
*req
,
1183 const struct netlbl_lsm_secattr
*secattr
)
1186 struct netlbl_dommap_def
*entry
;
1187 struct inet_request_sock
*ireq
= inet_rsk(req
);
1190 switch (req
->rsk_ops
->family
) {
1192 entry
= netlbl_domhsh_getentry_af4(secattr
->domain
,
1194 if (entry
== NULL
) {
1196 goto req_setattr_return
;
1198 switch (entry
->type
) {
1199 case NETLBL_NLTYPE_CIPSOV4
:
1200 ret_val
= cipso_v4_req_setattr(req
,
1201 entry
->cipso
, secattr
);
1203 case NETLBL_NLTYPE_UNLABELED
:
1204 netlbl_req_delattr(req
);
1211 #if IS_ENABLED(CONFIG_IPV6)
1213 entry
= netlbl_domhsh_getentry_af6(secattr
->domain
,
1214 &ireq
->ir_v6_rmt_addr
);
1215 if (entry
== NULL
) {
1217 goto req_setattr_return
;
1219 switch (entry
->type
) {
1220 case NETLBL_NLTYPE_CALIPSO
:
1221 ret_val
= calipso_req_setattr(req
,
1222 entry
->calipso
, secattr
);
1224 case NETLBL_NLTYPE_UNLABELED
:
1225 netlbl_req_delattr(req
);
1234 ret_val
= -EPROTONOSUPPORT
;
1243 * netlbl_req_delattr - Delete all the NetLabel labels on a socket
1247 * Remove all the NetLabel labeling from @req.
1250 void netlbl_req_delattr(struct request_sock
*req
)
1252 switch (req
->rsk_ops
->family
) {
1254 cipso_v4_req_delattr(req
);
1256 #if IS_ENABLED(CONFIG_IPV6)
1258 calipso_req_delattr(req
);
1265 * netlbl_skbuff_setattr - Label a packet using the correct protocol
1267 * @family: protocol family
1268 * @secattr: the security attributes
1271 * Attach the correct label to the given packet using the security attributes
1272 * specified in @secattr. Returns zero on success, negative values on failure.
1275 int netlbl_skbuff_setattr(struct sk_buff
*skb
,
1277 const struct netlbl_lsm_secattr
*secattr
)
1281 #if IS_ENABLED(CONFIG_IPV6)
1282 struct ipv6hdr
*hdr6
;
1284 struct netlbl_dommap_def
*entry
;
1290 entry
= netlbl_domhsh_getentry_af4(secattr
->domain
,
1292 if (entry
== NULL
) {
1294 goto skbuff_setattr_return
;
1296 switch (entry
->type
) {
1297 case NETLBL_NLTYPE_CIPSOV4
:
1298 ret_val
= cipso_v4_skbuff_setattr(skb
, entry
->cipso
,
1301 case NETLBL_NLTYPE_UNLABELED
:
1302 /* just delete the protocols we support for right now
1303 * but we could remove other protocols if needed */
1304 ret_val
= cipso_v4_skbuff_delattr(skb
);
1310 #if IS_ENABLED(CONFIG_IPV6)
1312 hdr6
= ipv6_hdr(skb
);
1313 entry
= netlbl_domhsh_getentry_af6(secattr
->domain
,
1315 if (entry
== NULL
) {
1317 goto skbuff_setattr_return
;
1319 switch (entry
->type
) {
1320 case NETLBL_NLTYPE_CALIPSO
:
1321 ret_val
= calipso_skbuff_setattr(skb
, entry
->calipso
,
1324 case NETLBL_NLTYPE_UNLABELED
:
1325 /* just delete the protocols we support for right now
1326 * but we could remove other protocols if needed */
1327 ret_val
= calipso_skbuff_delattr(skb
);
1335 ret_val
= -EPROTONOSUPPORT
;
1338 skbuff_setattr_return
:
1344 * netlbl_skbuff_getattr - Determine the security attributes of a packet
1346 * @family: protocol family
1347 * @secattr: the security attributes
1350 * Examines the given packet to see if a recognized form of packet labeling
1351 * is present, if so it parses the packet label and returns the security
1352 * attributes in @secattr. Returns zero on success, negative values on
1356 int netlbl_skbuff_getattr(const struct sk_buff
*skb
,
1358 struct netlbl_lsm_secattr
*secattr
)
1364 ptr
= cipso_v4_optptr(skb
);
1365 if (ptr
&& cipso_v4_getattr(ptr
, secattr
) == 0)
1368 #if IS_ENABLED(CONFIG_IPV6)
1370 ptr
= calipso_optptr(skb
);
1371 if (ptr
&& calipso_getattr(ptr
, secattr
) == 0)
1377 return netlbl_unlabel_getattr(skb
, family
, secattr
);
1381 * netlbl_skbuff_err - Handle a LSM error on a sk_buff
1383 * @family: the family
1384 * @error: the error code
1385 * @gateway: true if host is acting as a gateway, false otherwise
1388 * Deal with a LSM problem when handling the packet in @skb, typically this is
1389 * a permission denied problem (-EACCES). The correct action is determined
1390 * according to the packet's labeling protocol.
1393 void netlbl_skbuff_err(struct sk_buff
*skb
, u16 family
, int error
, int gateway
)
1397 if (cipso_v4_optptr(skb
))
1398 cipso_v4_error(skb
, error
, gateway
);
1404 * netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches
1407 * For all of the NetLabel protocols that support some form of label mapping
1408 * cache, invalidate the cache. Returns zero on success, negative values on
1412 void netlbl_cache_invalidate(void)
1414 cipso_v4_cache_invalidate();
1415 #if IS_ENABLED(CONFIG_IPV6)
1416 calipso_cache_invalidate();
1421 * netlbl_cache_add - Add an entry to a NetLabel protocol cache
1423 * @family: the family
1424 * @secattr: the packet's security attributes
1427 * Add the LSM security attributes for the given packet to the underlying
1428 * NetLabel protocol's label mapping cache. Returns zero on success, negative
1432 int netlbl_cache_add(const struct sk_buff
*skb
, u16 family
,
1433 const struct netlbl_lsm_secattr
*secattr
)
1437 if ((secattr
->flags
& NETLBL_SECATTR_CACHE
) == 0)
1442 ptr
= cipso_v4_optptr(skb
);
1444 return cipso_v4_cache_add(ptr
, secattr
);
1446 #if IS_ENABLED(CONFIG_IPV6)
1448 ptr
= calipso_optptr(skb
);
1450 return calipso_cache_add(ptr
, secattr
);
1458 * Protocol Engine Functions
1462 * netlbl_audit_start - Start an audit message
1463 * @type: audit message type
1464 * @audit_info: NetLabel audit information
1467 * Start an audit message using the type specified in @type and fill the audit
1468 * message with some fields common to all NetLabel audit messages. This
1469 * function should only be used by protocol engines, not LSMs. Returns a
1470 * pointer to the audit buffer on success, NULL on failure.
1473 struct audit_buffer
*netlbl_audit_start(int type
,
1474 struct netlbl_audit
*audit_info
)
1476 return netlbl_audit_start_common(type
, audit_info
);
1478 EXPORT_SYMBOL(netlbl_audit_start
);
1485 * netlbl_init - Initialize NetLabel
1488 * Perform the required NetLabel initialization before first use.
1491 static int __init
netlbl_init(void)
1495 printk(KERN_INFO
"NetLabel: Initializing\n");
1496 printk(KERN_INFO
"NetLabel: domain hash size = %u\n",
1497 (1 << NETLBL_DOMHSH_BITSIZE
));
1498 printk(KERN_INFO
"NetLabel: protocols = UNLABELED CIPSOv4 CALIPSO\n");
1500 ret_val
= netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE
);
1504 ret_val
= netlbl_unlabel_init(NETLBL_UNLHSH_BITSIZE
);
1508 ret_val
= netlbl_netlink_init();
1512 ret_val
= netlbl_unlabel_defconf();
1515 printk(KERN_INFO
"NetLabel: unlabeled traffic allowed by default\n");
1520 panic("NetLabel: failed to initialize properly (%d)\n", ret_val
);
1523 subsys_initcall(netlbl_init
);