Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gerg/m68knommu
[linux/fpc-iii.git] / net / netlabel / netlabel_kapi.c
blob28cddc85b7005aa6b6afa7b2c22f8f88a5b7fa46
1 /*
2 * NetLabel Kernel API
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.
8 * Author: Paul Moore <paul@paul-moore.com>
13 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008
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.
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.
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, see <http://www.gnu.org/licenses/>.
30 #include <linux/init.h>
31 #include <linux/types.h>
32 #include <linux/slab.h>
33 #include <linux/audit.h>
34 #include <linux/in.h>
35 #include <linux/in6.h>
36 #include <net/ip.h>
37 #include <net/ipv6.h>
38 #include <net/netlabel.h>
39 #include <net/cipso_ipv4.h>
40 #include <asm/bug.h>
41 #include <linux/atomic.h>
43 #include "netlabel_domainhash.h"
44 #include "netlabel_unlabeled.h"
45 #include "netlabel_cipso_v4.h"
46 #include "netlabel_user.h"
47 #include "netlabel_mgmt.h"
48 #include "netlabel_addrlist.h"
51 * Configuration Functions
54 /**
55 * netlbl_cfg_map_del - Remove a NetLabel/LSM domain mapping
56 * @domain: the domain mapping to remove
57 * @family: address family
58 * @addr: IP address
59 * @mask: IP address mask
60 * @audit_info: NetLabel audit information
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.
68 int netlbl_cfg_map_del(const char *domain,
69 u16 family,
70 const void *addr,
71 const void *mask,
72 struct netlbl_audit *audit_info)
74 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;
84 } else
85 return -EINVAL;
88 /**
89 * netlbl_cfg_unlbl_map_add - Add a new unlabeled mapping
90 * @domain: the domain mapping to add
91 * @family: address family
92 * @addr: IP address
93 * @mask: IP address mask
94 * @audit_info: NetLabel audit information
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.
102 int netlbl_cfg_unlbl_map_add(const char *domain,
103 u16 family,
104 const void *addr,
105 const void *mask,
106 struct netlbl_audit *audit_info)
108 int ret_val = -ENOMEM;
109 struct netlbl_dom_map *entry;
110 struct netlbl_domaddr_map *addrmap = NULL;
111 struct netlbl_domaddr4_map *map4 = NULL;
112 struct netlbl_domaddr6_map *map6 = NULL;
114 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
115 if (entry == NULL)
116 return -ENOMEM;
117 if (domain != NULL) {
118 entry->domain = kstrdup(domain, GFP_ATOMIC);
119 if (entry->domain == NULL)
120 goto cfg_unlbl_map_add_failure;
123 if (addr == NULL && mask == NULL)
124 entry->def.type = NETLBL_NLTYPE_UNLABELED;
125 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);
132 switch (family) {
133 case AF_INET: {
134 const struct in_addr *addr4 = addr;
135 const struct in_addr *mask4 = mask;
136 map4 = kzalloc(sizeof(*map4), GFP_ATOMIC);
137 if (map4 == NULL)
138 goto cfg_unlbl_map_add_failure;
139 map4->def.type = NETLBL_NLTYPE_UNLABELED;
140 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;
149 #if IS_ENABLED(CONFIG_IPV6)
150 case AF_INET6: {
151 const struct in6_addr *addr6 = addr;
152 const struct in6_addr *mask6 = mask;
153 map6 = kzalloc(sizeof(*map6), GFP_ATOMIC);
154 if (map6 == NULL)
155 goto cfg_unlbl_map_add_failure;
156 map6->def.type = NETLBL_NLTYPE_UNLABELED;
157 map6->list.addr = *addr6;
158 map6->list.addr.s6_addr32[0] &= mask6->s6_addr32[0];
159 map6->list.addr.s6_addr32[1] &= mask6->s6_addr32[1];
160 map6->list.addr.s6_addr32[2] &= mask6->s6_addr32[2];
161 map6->list.addr.s6_addr32[3] &= mask6->s6_addr32[3];
162 map6->list.mask = *mask6;
163 map6->list.valid = 1;
164 ret_val = netlbl_af6list_add(&map6->list,
165 &addrmap->list6);
166 if (ret_val != 0)
167 goto cfg_unlbl_map_add_failure;
168 break;
170 #endif /* IPv6 */
171 default:
172 goto cfg_unlbl_map_add_failure;
175 entry->def.addrsel = addrmap;
176 entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
177 } else {
178 ret_val = -EINVAL;
179 goto cfg_unlbl_map_add_failure;
182 ret_val = netlbl_domhsh_add(entry, audit_info);
183 if (ret_val != 0)
184 goto cfg_unlbl_map_add_failure;
186 return 0;
188 cfg_unlbl_map_add_failure:
189 kfree(entry->domain);
190 kfree(entry);
191 kfree(addrmap);
192 kfree(map4);
193 kfree(map6);
194 return ret_val;
199 * 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
206 * @audit_info: NetLabel audit information
208 * Description:
209 * 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.
214 int 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)
222 u32 addr_len;
224 switch (family) {
225 case AF_INET:
226 addr_len = sizeof(struct in_addr);
227 break;
228 #if IS_ENABLED(CONFIG_IPV6)
229 case AF_INET6:
230 addr_len = sizeof(struct in6_addr);
231 break;
232 #endif /* IPv6 */
233 default:
234 return -EPFNOSUPPORT;
237 return netlbl_unlhsh_add(net,
238 dev_name, addr, mask, addr_len,
239 secid, audit_info);
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
249 * @audit_info: NetLabel audit information
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.
257 int 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)
264 u32 addr_len;
266 switch (family) {
267 case AF_INET:
268 addr_len = sizeof(struct in_addr);
269 break;
270 #if IS_ENABLED(CONFIG_IPV6)
271 case AF_INET6:
272 addr_len = sizeof(struct in6_addr);
273 break;
274 #endif /* IPv6 */
275 default:
276 return -EPFNOSUPPORT;
279 return netlbl_unlhsh_remove(net,
280 dev_name, addr, mask, addr_len,
281 audit_info);
285 * netlbl_cfg_cipsov4_add - Add a new CIPSOv4 DOI definition
286 * @doi_def: CIPSO DOI definition
287 * @audit_info: NetLabel audit information
289 * Description:
290 * Add a new CIPSO DOI definition as defined by @doi_def. Returns zero on
291 * success and negative values on failure.
294 int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def,
295 struct netlbl_audit *audit_info)
297 return cipso_v4_doi_add(doi_def, audit_info);
301 * netlbl_cfg_cipsov4_del - Remove an existing CIPSOv4 DOI definition
302 * @doi: CIPSO DOI
303 * @audit_info: NetLabel audit information
305 * Description:
306 * Remove an existing CIPSO DOI definition matching @doi. Returns zero on
307 * success and negative values on failure.
310 void netlbl_cfg_cipsov4_del(u32 doi, struct netlbl_audit *audit_info)
312 cipso_v4_doi_remove(doi, audit_info);
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
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.
329 int netlbl_cfg_cipsov4_map_add(u32 doi,
330 const char *domain,
331 const struct in_addr *addr,
332 const struct in_addr *mask,
333 struct netlbl_audit *audit_info)
335 int ret_val = -ENOMEM;
336 struct cipso_v4_doi *doi_def;
337 struct netlbl_dom_map *entry;
338 struct netlbl_domaddr_map *addrmap = NULL;
339 struct netlbl_domaddr4_map *addrinfo = NULL;
341 doi_def = cipso_v4_doi_getdef(doi);
342 if (doi_def == NULL)
343 return -ENOENT;
345 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
346 if (entry == NULL)
347 goto out_entry;
348 if (domain != NULL) {
349 entry->domain = kstrdup(domain, GFP_ATOMIC);
350 if (entry->domain == NULL)
351 goto out_domain;
354 if (addr == NULL && mask == NULL) {
355 entry->def.cipso = doi_def;
356 entry->def.type = NETLBL_NLTYPE_CIPSOV4;
357 } else if (addr != NULL && mask != NULL) {
358 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
359 if (addrmap == NULL)
360 goto out_addrmap;
361 INIT_LIST_HEAD(&addrmap->list4);
362 INIT_LIST_HEAD(&addrmap->list6);
364 addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC);
365 if (addrinfo == NULL)
366 goto out_addrinfo;
367 addrinfo->def.cipso = doi_def;
368 addrinfo->def.type = NETLBL_NLTYPE_CIPSOV4;
369 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;
376 entry->def.addrsel = addrmap;
377 entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
378 } else {
379 ret_val = -EINVAL;
380 goto out_addrmap;
383 ret_val = netlbl_domhsh_add(entry, audit_info);
384 if (ret_val != 0)
385 goto cfg_cipsov4_map_add_failure;
387 return 0;
389 cfg_cipsov4_map_add_failure:
390 kfree(addrinfo);
391 out_addrinfo:
392 kfree(addrmap);
393 out_addrmap:
394 kfree(entry->domain);
395 out_domain:
396 kfree(entry);
397 out_entry:
398 cipso_v4_doi_putdef(doi_def);
399 return ret_val;
403 * Security Attribute Functions
406 #define _CM_F_NONE 0x00000000
407 #define _CM_F_ALLOC 0x00000001
408 #define _CM_F_WALK 0x00000002
411 * _netlbl_catmap_getnode - Get a individual node from a catmap
412 * @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
417 * Description:
418 * 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.
425 static 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)
431 struct netlbl_lsm_catmap *iter = *catmap;
432 struct netlbl_lsm_catmap *prev = NULL;
434 if (iter == NULL)
435 goto catmap_getnode_alloc;
436 if (offset < iter->startbit)
437 goto catmap_getnode_walk;
438 while (iter && offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
439 prev = iter;
440 iter = iter->next;
442 if (iter == NULL || offset < iter->startbit)
443 goto catmap_getnode_walk;
445 return iter;
447 catmap_getnode_walk:
448 if (cm_flags & _CM_F_WALK)
449 return iter;
450 catmap_getnode_alloc:
451 if (!(cm_flags & _CM_F_ALLOC))
452 return NULL;
454 iter = netlbl_catmap_alloc(gfp_flags);
455 if (iter == NULL)
456 return NULL;
457 iter->startbit = offset & ~(NETLBL_CATMAP_SIZE - 1);
459 if (prev == NULL) {
460 iter->next = *catmap;
461 *catmap = iter;
462 } else {
463 iter->next = prev->next;
464 prev->next = iter;
467 return iter;
471 * netlbl_catmap_walk - Walk a LSM secattr catmap looking for a bit
472 * @catmap: the category bitmap
473 * @offset: the offset to start searching at, in bits
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.
480 int netlbl_catmap_walk(struct netlbl_lsm_catmap *catmap, u32 offset)
482 struct netlbl_lsm_catmap *iter = catmap;
483 u32 idx;
484 u32 bit;
485 NETLBL_CATMAP_MAPTYPE bitmap;
487 iter = _netlbl_catmap_getnode(&catmap, offset, _CM_F_WALK, 0);
488 if (iter == NULL)
489 return -ENOENT;
490 if (offset > iter->startbit) {
491 offset -= iter->startbit;
492 idx = offset / NETLBL_CATMAP_MAPSIZE;
493 bit = offset % NETLBL_CATMAP_MAPSIZE;
494 } else {
495 idx = 0;
496 bit = 0;
498 bitmap = iter->bitmap[idx] >> bit;
500 for (;;) {
501 if (bitmap != 0) {
502 while ((bitmap & NETLBL_CATMAP_BIT) == 0) {
503 bitmap >>= 1;
504 bit++;
506 return iter->startbit +
507 (NETLBL_CATMAP_MAPSIZE * idx) + bit;
509 if (++idx >= NETLBL_CATMAP_MAPCNT) {
510 if (iter->next != NULL) {
511 iter = iter->next;
512 idx = 0;
513 } else
514 return -ENOENT;
516 bitmap = iter->bitmap[idx];
517 bit = 0;
520 return -ENOENT;
524 * netlbl_catmap_walkrng - Find the end of a string of set bits
525 * @catmap: the category bitmap
526 * @offset: the offset to start searching at, in bits
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.
534 int netlbl_catmap_walkrng(struct netlbl_lsm_catmap *catmap, u32 offset)
536 struct netlbl_lsm_catmap *iter;
537 struct netlbl_lsm_catmap *prev = NULL;
538 u32 idx;
539 u32 bit;
540 NETLBL_CATMAP_MAPTYPE bitmask;
541 NETLBL_CATMAP_MAPTYPE bitmap;
543 iter = _netlbl_catmap_getnode(&catmap, offset, _CM_F_WALK, 0);
544 if (iter == NULL)
545 return -ENOENT;
546 if (offset > iter->startbit) {
547 offset -= iter->startbit;
548 idx = offset / NETLBL_CATMAP_MAPSIZE;
549 bit = offset % NETLBL_CATMAP_MAPSIZE;
550 } else {
551 idx = 0;
552 bit = 0;
554 bitmask = NETLBL_CATMAP_BIT << bit;
556 for (;;) {
557 bitmap = iter->bitmap[idx];
558 while (bitmask != 0 && (bitmap & bitmask) != 0) {
559 bitmask <<= 1;
560 bit++;
563 if (prev && idx == 0 && bit == 0)
564 return prev->startbit + NETLBL_CATMAP_SIZE - 1;
565 else if (bitmask != 0)
566 return iter->startbit +
567 (NETLBL_CATMAP_MAPSIZE * idx) + bit - 1;
568 else if (++idx >= NETLBL_CATMAP_MAPCNT) {
569 if (iter->next == NULL)
570 return iter->startbit + NETLBL_CATMAP_SIZE - 1;
571 prev = iter;
572 iter = iter->next;
573 idx = 0;
575 bitmask = NETLBL_CATMAP_BIT;
576 bit = 0;
579 return -ENOENT;
583 * netlbl_catmap_getlong - Export an unsigned long bitmap
584 * @catmap: pointer to the category bitmap
585 * @offset: pointer to the requested offset
586 * @bitmap: the exported bitmap
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.
596 int netlbl_catmap_getlong(struct netlbl_lsm_catmap *catmap,
597 u32 *offset,
598 unsigned long *bitmap)
600 struct netlbl_lsm_catmap *iter;
601 u32 off = *offset;
602 u32 idx;
604 /* only allow aligned offsets */
605 if ((off & (BITS_PER_LONG - 1)) != 0)
606 return -EINVAL;
608 if (off < catmap->startbit) {
609 off = catmap->startbit;
610 *offset = off;
612 iter = _netlbl_catmap_getnode(&catmap, off, _CM_F_NONE, 0);
613 if (iter == NULL) {
614 *offset = (u32)-1;
615 return 0;
618 if (off < iter->startbit) {
619 off = iter->startbit;
620 *offset = off;
621 } else
622 off -= iter->startbit;
624 idx = off / NETLBL_CATMAP_MAPSIZE;
625 *bitmap = iter->bitmap[idx] >> (off % NETLBL_CATMAP_SIZE);
627 return 0;
631 * netlbl_catmap_setbit - Set a bit in a LSM secattr catmap
632 * @catmap: pointer to the category bitmap
633 * @bit: the bit to set
634 * @flags: memory allocation flags
636 * Description:
637 * Set the bit specified by @bit in @catmap. Returns zero on success,
638 * negative values on failure.
641 int netlbl_catmap_setbit(struct netlbl_lsm_catmap **catmap,
642 u32 bit,
643 gfp_t flags)
645 struct netlbl_lsm_catmap *iter;
646 u32 idx;
648 iter = _netlbl_catmap_getnode(catmap, bit, _CM_F_ALLOC, flags);
649 if (iter == NULL)
650 return -ENOMEM;
652 bit -= iter->startbit;
653 idx = bit / NETLBL_CATMAP_MAPSIZE;
654 iter->bitmap[idx] |= NETLBL_CATMAP_BIT << (bit % NETLBL_CATMAP_MAPSIZE);
656 return 0;
660 * netlbl_catmap_setrng - Set a range of bits in a LSM secattr catmap
661 * @catmap: pointer to the category bitmap
662 * @start: the starting bit
663 * @end: the last bit in the string
664 * @flags: memory allocation flags
666 * Description:
667 * Set a range of bits, starting at @start and ending with @end. Returns zero
668 * on success, negative values on failure.
671 int netlbl_catmap_setrng(struct netlbl_lsm_catmap **catmap,
672 u32 start,
673 u32 end,
674 gfp_t flags)
676 int rc = 0;
677 u32 spot = start;
679 while (rc == 0 && spot <= end) {
680 if (((spot & (BITS_PER_LONG - 1)) != 0) &&
681 ((end - spot) > BITS_PER_LONG)) {
682 rc = netlbl_catmap_setlong(catmap,
683 spot,
684 (unsigned long)-1,
685 flags);
686 spot += BITS_PER_LONG;
687 } else
688 rc = netlbl_catmap_setbit(catmap, spot++, flags);
691 return rc;
695 * netlbl_catmap_setlong - Import an unsigned long bitmap
696 * @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
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.
707 int netlbl_catmap_setlong(struct netlbl_lsm_catmap **catmap,
708 u32 offset,
709 unsigned long bitmap,
710 gfp_t flags)
712 struct netlbl_lsm_catmap *iter;
713 u32 idx;
715 /* only allow aligned offsets */
716 if ((offset & (BITS_PER_LONG - 1)) != 0)
717 return -EINVAL;
719 iter = _netlbl_catmap_getnode(catmap, offset, _CM_F_ALLOC, flags);
720 if (iter == NULL)
721 return -ENOMEM;
723 offset -= iter->startbit;
724 idx = offset / NETLBL_CATMAP_MAPSIZE;
725 iter->bitmap[idx] |= bitmap << (offset % NETLBL_CATMAP_MAPSIZE);
727 return 0;
731 * LSM Functions
735 * netlbl_enabled - Determine if the NetLabel subsystem is enabled
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.
746 int netlbl_enabled(void)
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 */
751 return (atomic_read(&netlabel_mgmt_protocount) > 0);
755 * netlbl_sock_setattr - Label a socket using the correct protocol
756 * @sk: the socket to label
757 * @family: protocol family
758 * @secattr: the security attributes
760 * Description:
761 * Attach the correct label to the given socket using the security attributes
762 * 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.
764 * 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.
769 int netlbl_sock_setattr(struct sock *sk,
770 u16 family,
771 const struct netlbl_lsm_secattr *secattr)
773 int ret_val;
774 struct netlbl_dom_map *dom_entry;
776 rcu_read_lock();
777 dom_entry = netlbl_domhsh_getentry(secattr->domain);
778 if (dom_entry == NULL) {
779 ret_val = -ENOENT;
780 goto socket_setattr_return;
782 switch (family) {
783 case AF_INET:
784 switch (dom_entry->def.type) {
785 case NETLBL_NLTYPE_ADDRSELECT:
786 ret_val = -EDESTADDRREQ;
787 break;
788 case NETLBL_NLTYPE_CIPSOV4:
789 ret_val = cipso_v4_sock_setattr(sk,
790 dom_entry->def.cipso,
791 secattr);
792 break;
793 case NETLBL_NLTYPE_UNLABELED:
794 ret_val = 0;
795 break;
796 default:
797 ret_val = -ENOENT;
799 break;
800 #if IS_ENABLED(CONFIG_IPV6)
801 case AF_INET6:
802 /* since we don't support any IPv6 labeling protocols right
803 * now we can optimize everything away until we do */
804 ret_val = 0;
805 break;
806 #endif /* IPv6 */
807 default:
808 ret_val = -EPROTONOSUPPORT;
811 socket_setattr_return:
812 rcu_read_unlock();
813 return ret_val;
817 * netlbl_sock_delattr - Delete all the NetLabel labels on a socket
818 * @sk: the socket
820 * Description:
821 * Remove all the NetLabel labeling from @sk. The caller is responsible for
822 * ensuring that @sk is locked.
825 void netlbl_sock_delattr(struct sock *sk)
827 cipso_v4_sock_delattr(sk);
831 * netlbl_sock_getattr - Determine the security attributes of a sock
832 * @sk: the sock
833 * @secattr: the security attributes
835 * Description:
836 * Examines the given sock to see if any NetLabel style labeling has been
837 * 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.
842 int netlbl_sock_getattr(struct sock *sk,
843 struct netlbl_lsm_secattr *secattr)
845 int ret_val;
847 switch (sk->sk_family) {
848 case AF_INET:
849 ret_val = cipso_v4_sock_getattr(sk, secattr);
850 break;
851 #if IS_ENABLED(CONFIG_IPV6)
852 case AF_INET6:
853 ret_val = -ENOMSG;
854 break;
855 #endif /* IPv6 */
856 default:
857 ret_val = -EPROTONOSUPPORT;
860 return ret_val;
864 * 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
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.
875 int netlbl_conn_setattr(struct sock *sk,
876 struct sockaddr *addr,
877 const struct netlbl_lsm_secattr *secattr)
879 int ret_val;
880 struct sockaddr_in *addr4;
881 struct netlbl_dommap_def *entry;
883 rcu_read_lock();
884 switch (addr->sa_family) {
885 case AF_INET:
886 addr4 = (struct sockaddr_in *)addr;
887 entry = netlbl_domhsh_getentry_af4(secattr->domain,
888 addr4->sin_addr.s_addr);
889 if (entry == NULL) {
890 ret_val = -ENOENT;
891 goto conn_setattr_return;
893 switch (entry->type) {
894 case NETLBL_NLTYPE_CIPSOV4:
895 ret_val = cipso_v4_sock_setattr(sk,
896 entry->cipso, secattr);
897 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;
907 break;
908 #if IS_ENABLED(CONFIG_IPV6)
909 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:
916 ret_val = -EPROTONOSUPPORT;
919 conn_setattr_return:
920 rcu_read_unlock();
921 return ret_val;
925 * netlbl_req_setattr - Label a request socket using the correct protocol
926 * @req: the request socket to label
927 * @secattr: the security attributes
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.
934 int netlbl_req_setattr(struct request_sock *req,
935 const struct netlbl_lsm_secattr *secattr)
937 int ret_val;
938 struct netlbl_dommap_def *entry;
940 rcu_read_lock();
941 switch (req->rsk_ops->family) {
942 case AF_INET:
943 entry = netlbl_domhsh_getentry_af4(secattr->domain,
944 inet_rsk(req)->ir_rmt_addr);
945 if (entry == NULL) {
946 ret_val = -ENOENT;
947 goto req_setattr_return;
949 switch (entry->type) {
950 case NETLBL_NLTYPE_CIPSOV4:
951 ret_val = cipso_v4_req_setattr(req,
952 entry->cipso, secattr);
953 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;
963 break;
964 #if IS_ENABLED(CONFIG_IPV6)
965 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;
975 req_setattr_return:
976 rcu_read_unlock();
977 return ret_val;
981 * netlbl_req_delattr - Delete all the NetLabel labels on a socket
982 * @req: the socket
984 * Description:
985 * Remove all the NetLabel labeling from @req.
988 void netlbl_req_delattr(struct request_sock *req)
990 cipso_v4_req_delattr(req);
994 * netlbl_skbuff_setattr - Label a packet using the correct protocol
995 * @skb: the packet
996 * @family: protocol family
997 * @secattr: the security attributes
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.
1004 int netlbl_skbuff_setattr(struct sk_buff *skb,
1005 u16 family,
1006 const struct netlbl_lsm_secattr *secattr)
1008 int ret_val;
1009 struct iphdr *hdr4;
1010 struct netlbl_dommap_def *entry;
1012 rcu_read_lock();
1013 switch (family) {
1014 case AF_INET:
1015 hdr4 = ip_hdr(skb);
1016 entry = netlbl_domhsh_getentry_af4(secattr->domain,hdr4->daddr);
1017 if (entry == NULL) {
1018 ret_val = -ENOENT;
1019 goto skbuff_setattr_return;
1021 switch (entry->type) {
1022 case NETLBL_NLTYPE_CIPSOV4:
1023 ret_val = cipso_v4_skbuff_setattr(skb, entry->cipso,
1024 secattr);
1025 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;
1034 break;
1035 #if IS_ENABLED(CONFIG_IPV6)
1036 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:
1043 ret_val = -EPROTONOSUPPORT;
1046 skbuff_setattr_return:
1047 rcu_read_unlock();
1048 return ret_val;
1052 * netlbl_skbuff_getattr - Determine the security attributes of a packet
1053 * @skb: the packet
1054 * @family: protocol family
1055 * @secattr: the security attributes
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.
1064 int netlbl_skbuff_getattr(const struct sk_buff *skb,
1065 u16 family,
1066 struct netlbl_lsm_secattr *secattr)
1068 unsigned char *ptr;
1070 switch (family) {
1071 case AF_INET:
1072 ptr = cipso_v4_optptr(skb);
1073 if (ptr && cipso_v4_getattr(ptr, secattr) == 0)
1074 return 0;
1075 break;
1076 #if IS_ENABLED(CONFIG_IPV6)
1077 case AF_INET6:
1078 break;
1079 #endif /* IPv6 */
1082 return netlbl_unlabel_getattr(skb, family, secattr);
1086 * netlbl_skbuff_err - Handle a LSM error on a sk_buff
1087 * @skb: the packet
1088 * @error: the error code
1089 * @gateway: true if host is acting as a gateway, false otherwise
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.
1097 void netlbl_skbuff_err(struct sk_buff *skb, int error, int gateway)
1099 if (cipso_v4_optptr(skb))
1100 cipso_v4_error(skb, error, gateway);
1104 * netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches
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.
1112 void netlbl_cache_invalidate(void)
1114 cipso_v4_cache_invalidate();
1118 * netlbl_cache_add - Add an entry to a NetLabel protocol cache
1119 * @skb: the packet
1120 * @secattr: the packet's security attributes
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.
1128 int netlbl_cache_add(const struct sk_buff *skb,
1129 const struct netlbl_lsm_secattr *secattr)
1131 unsigned char *ptr;
1133 if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0)
1134 return -ENOMSG;
1136 ptr = cipso_v4_optptr(skb);
1137 if (ptr)
1138 return cipso_v4_cache_add(ptr, secattr);
1140 return -ENOMSG;
1144 * Protocol Engine Functions
1148 * netlbl_audit_start - Start an audit message
1149 * @type: audit message type
1150 * @audit_info: NetLabel audit information
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.
1159 struct audit_buffer *netlbl_audit_start(int type,
1160 struct netlbl_audit *audit_info)
1162 return netlbl_audit_start_common(type, audit_info);
1166 * Setup Functions
1170 * netlbl_init - Initialize NetLabel
1172 * Description:
1173 * Perform the required NetLabel initialization before first use.
1176 static int __init netlbl_init(void)
1178 int ret_val;
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");
1188 ret_val = netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE);
1189 if (ret_val != 0)
1190 goto init_failure;
1192 ret_val = netlbl_unlabel_init(NETLBL_UNLHSH_BITSIZE);
1193 if (ret_val != 0)
1194 goto init_failure;
1196 ret_val = netlbl_netlink_init();
1197 if (ret_val != 0)
1198 goto init_failure;
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");
1205 return 0;
1207 init_failure:
1208 panic("NetLabel: failed to initialize properly (%d)\n", ret_val);
1211 subsys_initcall(netlbl_init);