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
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>
35 #include <linux/in6.h>
38 #include <net/netlabel.h>
39 #include <net/cipso_ipv4.h>
40 #include <net/calipso.h>
42 #include <linux/atomic.h>
44 #include "netlabel_domainhash.h"
45 #include "netlabel_unlabeled.h"
46 #include "netlabel_cipso_v4.h"
47 #include "netlabel_calipso.h"
48 #include "netlabel_user.h"
49 #include "netlabel_mgmt.h"
50 #include "netlabel_addrlist.h"
53 * Configuration Functions
57 * netlbl_cfg_map_del - Remove a NetLabel/LSM domain mapping
58 * @domain: the domain mapping to remove
59 * @family: address family
61 * @mask: IP address mask
62 * @audit_info: NetLabel audit information
65 * Removes a NetLabel/LSM domain mapping. A @domain value of NULL causes the
66 * default domain mapping to be removed. Returns zero on success, negative
70 int netlbl_cfg_map_del(const char *domain,
74 struct netlbl_audit *audit_info)
76 if (addr == NULL && mask == NULL) {
77 return netlbl_domhsh_remove(domain, family, audit_info);
78 } else if (addr != NULL && mask != NULL) {
81 return netlbl_domhsh_remove_af4(domain, addr, mask,
83 #if IS_ENABLED(CONFIG_IPV6)
85 return netlbl_domhsh_remove_af6(domain, addr, mask,
96 * netlbl_cfg_unlbl_map_add - Add a new unlabeled mapping
97 * @domain: the domain mapping to add
98 * @family: address family
100 * @mask: IP address mask
101 * @audit_info: NetLabel audit information
104 * Adds a new unlabeled NetLabel/LSM domain mapping. A @domain value of NULL
105 * causes a new default domain mapping to be added. Returns zero on success,
106 * negative values on failure.
109 int netlbl_cfg_unlbl_map_add(const char *domain,
113 struct netlbl_audit *audit_info)
115 int ret_val = -ENOMEM;
116 struct netlbl_dom_map *entry;
117 struct netlbl_domaddr_map *addrmap = NULL;
118 struct netlbl_domaddr4_map *map4 = NULL;
119 struct netlbl_domaddr6_map *map6 = NULL;
121 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
124 if (domain != NULL) {
125 entry->domain = kstrdup(domain, GFP_ATOMIC);
126 if (entry->domain == NULL)
127 goto cfg_unlbl_map_add_failure;
129 entry->family = family;
131 if (addr == NULL && mask == NULL)
132 entry->def.type = NETLBL_NLTYPE_UNLABELED;
133 else if (addr != NULL && mask != NULL) {
134 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
136 goto cfg_unlbl_map_add_failure;
137 INIT_LIST_HEAD(&addrmap->list4);
138 INIT_LIST_HEAD(&addrmap->list6);
142 const struct in_addr *addr4 = addr;
143 const struct in_addr *mask4 = mask;
144 map4 = kzalloc(sizeof(*map4), GFP_ATOMIC);
146 goto cfg_unlbl_map_add_failure;
147 map4->def.type = NETLBL_NLTYPE_UNLABELED;
148 map4->list.addr = addr4->s_addr & mask4->s_addr;
149 map4->list.mask = mask4->s_addr;
150 map4->list.valid = 1;
151 ret_val = netlbl_af4list_add(&map4->list,
154 goto cfg_unlbl_map_add_failure;
157 #if IS_ENABLED(CONFIG_IPV6)
159 const struct in6_addr *addr6 = addr;
160 const struct in6_addr *mask6 = mask;
161 map6 = kzalloc(sizeof(*map6), GFP_ATOMIC);
163 goto cfg_unlbl_map_add_failure;
164 map6->def.type = NETLBL_NLTYPE_UNLABELED;
165 map6->list.addr = *addr6;
166 map6->list.addr.s6_addr32[0] &= mask6->s6_addr32[0];
167 map6->list.addr.s6_addr32[1] &= mask6->s6_addr32[1];
168 map6->list.addr.s6_addr32[2] &= mask6->s6_addr32[2];
169 map6->list.addr.s6_addr32[3] &= mask6->s6_addr32[3];
170 map6->list.mask = *mask6;
171 map6->list.valid = 1;
172 ret_val = netlbl_af6list_add(&map6->list,
175 goto cfg_unlbl_map_add_failure;
180 goto cfg_unlbl_map_add_failure;
183 entry->def.addrsel = addrmap;
184 entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
187 goto cfg_unlbl_map_add_failure;
190 ret_val = netlbl_domhsh_add(entry, audit_info);
192 goto cfg_unlbl_map_add_failure;
196 cfg_unlbl_map_add_failure:
197 kfree(entry->domain);
207 * netlbl_cfg_unlbl_static_add - Adds a new static label
208 * @net: network namespace
209 * @dev_name: interface name
210 * @addr: IP address in network byte order (struct in[6]_addr)
211 * @mask: address mask in network byte order (struct in[6]_addr)
212 * @family: address family
213 * @secid: LSM secid value for the entry
214 * @audit_info: NetLabel audit information
217 * Adds a new NetLabel static label to be used when protocol provided labels
218 * are not present on incoming traffic. If @dev_name is NULL then the default
219 * interface will be used. Returns zero on success, negative values on failure.
222 int netlbl_cfg_unlbl_static_add(struct net *net,
223 const char *dev_name,
228 struct netlbl_audit *audit_info)
234 addr_len = sizeof(struct in_addr);
236 #if IS_ENABLED(CONFIG_IPV6)
238 addr_len = sizeof(struct in6_addr);
242 return -EPFNOSUPPORT;
245 return netlbl_unlhsh_add(net,
246 dev_name, addr, mask, addr_len,
251 * netlbl_cfg_unlbl_static_del - Removes an existing static label
252 * @net: network namespace
253 * @dev_name: interface name
254 * @addr: IP address in network byte order (struct in[6]_addr)
255 * @mask: address mask in network byte order (struct in[6]_addr)
256 * @family: address family
257 * @audit_info: NetLabel audit information
260 * Removes an existing NetLabel static label used when protocol provided labels
261 * are not present on incoming traffic. If @dev_name is NULL then the default
262 * interface will be used. Returns zero on success, negative values on failure.
265 int netlbl_cfg_unlbl_static_del(struct net *net,
266 const char *dev_name,
270 struct netlbl_audit *audit_info)
276 addr_len = sizeof(struct in_addr);
278 #if IS_ENABLED(CONFIG_IPV6)
280 addr_len = sizeof(struct in6_addr);
284 return -EPFNOSUPPORT;
287 return netlbl_unlhsh_remove(net,
288 dev_name, addr, mask, addr_len,
293 * netlbl_cfg_cipsov4_add - Add a new CIPSOv4 DOI definition
294 * @doi_def: CIPSO DOI definition
295 * @audit_info: NetLabel audit information
298 * Add a new CIPSO DOI definition as defined by @doi_def. Returns zero on
299 * success and negative values on failure.
302 int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def,
303 struct netlbl_audit *audit_info)
305 return cipso_v4_doi_add(doi_def, audit_info);
309 * netlbl_cfg_cipsov4_del - Remove an existing CIPSOv4 DOI definition
311 * @audit_info: NetLabel audit information
314 * Remove an existing CIPSO DOI definition matching @doi. Returns zero on
315 * success and negative values on failure.
318 void netlbl_cfg_cipsov4_del(u32 doi, struct netlbl_audit *audit_info)
320 cipso_v4_doi_remove(doi, audit_info);
324 * netlbl_cfg_cipsov4_map_add - Add a new CIPSOv4 DOI mapping
325 * @doi: the CIPSO DOI
326 * @domain: the domain mapping to add
328 * @mask: IP address mask
329 * @audit_info: NetLabel audit information
332 * Add a new NetLabel/LSM domain mapping for the given CIPSO DOI to the NetLabel
333 * subsystem. A @domain value of NULL adds a new default domain mapping.
334 * Returns zero on success, negative values on failure.
337 int netlbl_cfg_cipsov4_map_add(u32 doi,
339 const struct in_addr *addr,
340 const struct in_addr *mask,
341 struct netlbl_audit *audit_info)
343 int ret_val = -ENOMEM;
344 struct cipso_v4_doi *doi_def;
345 struct netlbl_dom_map *entry;
346 struct netlbl_domaddr_map *addrmap = NULL;
347 struct netlbl_domaddr4_map *addrinfo = NULL;
349 doi_def = cipso_v4_doi_getdef(doi);
353 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
356 entry->family = AF_INET;
357 if (domain != NULL) {
358 entry->domain = kstrdup(domain, GFP_ATOMIC);
359 if (entry->domain == NULL)
363 if (addr == NULL && mask == NULL) {
364 entry->def.cipso = doi_def;
365 entry->def.type = NETLBL_NLTYPE_CIPSOV4;
366 } else if (addr != NULL && mask != NULL) {
367 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
370 INIT_LIST_HEAD(&addrmap->list4);
371 INIT_LIST_HEAD(&addrmap->list6);
373 addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC);
374 if (addrinfo == NULL)
376 addrinfo->def.cipso = doi_def;
377 addrinfo->def.type = NETLBL_NLTYPE_CIPSOV4;
378 addrinfo->list.addr = addr->s_addr & mask->s_addr;
379 addrinfo->list.mask = mask->s_addr;
380 addrinfo->list.valid = 1;
381 ret_val = netlbl_af4list_add(&addrinfo->list, &addrmap->list4);
383 goto cfg_cipsov4_map_add_failure;
385 entry->def.addrsel = addrmap;
386 entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
392 ret_val = netlbl_domhsh_add(entry, audit_info);
394 goto cfg_cipsov4_map_add_failure;
398 cfg_cipsov4_map_add_failure:
403 kfree(entry->domain);
407 cipso_v4_doi_putdef(doi_def);
412 * netlbl_cfg_calipso_add - Add a new CALIPSO DOI definition
413 * @doi_def: CALIPSO DOI definition
414 * @audit_info: NetLabel audit information
417 * Add a new CALIPSO DOI definition as defined by @doi_def. Returns zero on
418 * success and negative values on failure.
421 int netlbl_cfg_calipso_add(struct calipso_doi *doi_def,
422 struct netlbl_audit *audit_info)
424 #if IS_ENABLED(CONFIG_IPV6)
425 return calipso_doi_add(doi_def, audit_info);
432 * netlbl_cfg_calipso_del - Remove an existing CALIPSO DOI definition
434 * @audit_info: NetLabel audit information
437 * Remove an existing CALIPSO DOI definition matching @doi. Returns zero on
438 * success and negative values on failure.
441 void netlbl_cfg_calipso_del(u32 doi, struct netlbl_audit *audit_info)
443 #if IS_ENABLED(CONFIG_IPV6)
444 calipso_doi_remove(doi, audit_info);
449 * netlbl_cfg_calipso_map_add - Add a new CALIPSO DOI mapping
450 * @doi: the CALIPSO DOI
451 * @domain: the domain mapping to add
453 * @mask: IP address mask
454 * @audit_info: NetLabel audit information
457 * Add a new NetLabel/LSM domain mapping for the given CALIPSO DOI to the
458 * NetLabel subsystem. A @domain value of NULL adds a new default domain
459 * mapping. Returns zero on success, negative values on failure.
462 int netlbl_cfg_calipso_map_add(u32 doi,
464 const struct in6_addr *addr,
465 const struct in6_addr *mask,
466 struct netlbl_audit *audit_info)
468 #if IS_ENABLED(CONFIG_IPV6)
469 int ret_val = -ENOMEM;
470 struct calipso_doi *doi_def;
471 struct netlbl_dom_map *entry;
472 struct netlbl_domaddr_map *addrmap = NULL;
473 struct netlbl_domaddr6_map *addrinfo = NULL;
475 doi_def = calipso_doi_getdef(doi);
479 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
482 entry->family = AF_INET6;
483 if (domain != NULL) {
484 entry->domain = kstrdup(domain, GFP_ATOMIC);
485 if (entry->domain == NULL)
489 if (addr == NULL && mask == NULL) {
490 entry->def.calipso = doi_def;
491 entry->def.type = NETLBL_NLTYPE_CALIPSO;
492 } else if (addr != NULL && mask != NULL) {
493 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
496 INIT_LIST_HEAD(&addrmap->list4);
497 INIT_LIST_HEAD(&addrmap->list6);
499 addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC);
500 if (addrinfo == NULL)
502 addrinfo->def.calipso = doi_def;
503 addrinfo->def.type = NETLBL_NLTYPE_CALIPSO;
504 addrinfo->list.addr = *addr;
505 addrinfo->list.addr.s6_addr32[0] &= mask->s6_addr32[0];
506 addrinfo->list.addr.s6_addr32[1] &= mask->s6_addr32[1];
507 addrinfo->list.addr.s6_addr32[2] &= mask->s6_addr32[2];
508 addrinfo->list.addr.s6_addr32[3] &= mask->s6_addr32[3];
509 addrinfo->list.mask = *mask;
510 addrinfo->list.valid = 1;
511 ret_val = netlbl_af6list_add(&addrinfo->list, &addrmap->list6);
513 goto cfg_calipso_map_add_failure;
515 entry->def.addrsel = addrmap;
516 entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
522 ret_val = netlbl_domhsh_add(entry, audit_info);
524 goto cfg_calipso_map_add_failure;
528 cfg_calipso_map_add_failure:
533 kfree(entry->domain);
537 calipso_doi_putdef(doi_def);
545 * Security Attribute Functions
548 #define _CM_F_NONE 0x00000000
549 #define _CM_F_ALLOC 0x00000001
550 #define _CM_F_WALK 0x00000002
553 * _netlbl_catmap_getnode - Get a individual node from a catmap
554 * @catmap: pointer to the category bitmap
555 * @offset: the requested offset
556 * @cm_flags: catmap flags, see _CM_F_*
557 * @gfp_flags: memory allocation flags
560 * Iterate through the catmap looking for the node associated with @offset.
561 * If the _CM_F_ALLOC flag is set in @cm_flags and there is no associated node,
562 * one will be created and inserted into the catmap. If the _CM_F_WALK flag is
563 * set in @cm_flags and there is no associated node, the next highest node will
564 * be returned. Returns a pointer to the node on success, NULL on failure.
567 static struct netlbl_lsm_catmap *_netlbl_catmap_getnode(
568 struct netlbl_lsm_catmap **catmap,
570 unsigned int cm_flags,
573 struct netlbl_lsm_catmap *iter = *catmap;
574 struct netlbl_lsm_catmap *prev = NULL;
577 goto catmap_getnode_alloc;
578 if (offset < iter->startbit)
579 goto catmap_getnode_walk;
580 while (iter && offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
584 if (iter == NULL || offset < iter->startbit)
585 goto catmap_getnode_walk;
590 if (cm_flags & _CM_F_WALK)
592 catmap_getnode_alloc:
593 if (!(cm_flags & _CM_F_ALLOC))
596 iter = netlbl_catmap_alloc(gfp_flags);
599 iter->startbit = offset & ~(NETLBL_CATMAP_SIZE - 1);
602 iter->next = *catmap;
605 iter->next = prev->next;
613 * netlbl_catmap_walk - Walk a LSM secattr catmap looking for a bit
614 * @catmap: the category bitmap
615 * @offset: the offset to start searching at, in bits
618 * This function walks a LSM secattr category bitmap starting at @offset and
619 * returns the spot of the first set bit or -ENOENT if no bits are set.
622 int netlbl_catmap_walk(struct netlbl_lsm_catmap *catmap, u32 offset)
624 struct netlbl_lsm_catmap *iter = catmap;
627 NETLBL_CATMAP_MAPTYPE bitmap;
629 iter = _netlbl_catmap_getnode(&catmap, offset, _CM_F_WALK, 0);
632 if (offset > iter->startbit) {
633 offset -= iter->startbit;
634 idx = offset / NETLBL_CATMAP_MAPSIZE;
635 bit = offset % NETLBL_CATMAP_MAPSIZE;
640 bitmap = iter->bitmap[idx] >> bit;
644 while ((bitmap & NETLBL_CATMAP_BIT) == 0) {
648 return iter->startbit +
649 (NETLBL_CATMAP_MAPSIZE * idx) + bit;
651 if (++idx >= NETLBL_CATMAP_MAPCNT) {
652 if (iter->next != NULL) {
658 bitmap = iter->bitmap[idx];
664 EXPORT_SYMBOL(netlbl_catmap_walk);
667 * netlbl_catmap_walkrng - Find the end of a string of set bits
668 * @catmap: the category bitmap
669 * @offset: the offset to start searching at, in bits
672 * This function walks a LSM secattr category bitmap starting at @offset and
673 * returns the spot of the first cleared bit or -ENOENT if the offset is past
674 * the end of the bitmap.
677 int netlbl_catmap_walkrng(struct netlbl_lsm_catmap *catmap, u32 offset)
679 struct netlbl_lsm_catmap *iter;
680 struct netlbl_lsm_catmap *prev = NULL;
683 NETLBL_CATMAP_MAPTYPE bitmask;
684 NETLBL_CATMAP_MAPTYPE bitmap;
686 iter = _netlbl_catmap_getnode(&catmap, offset, _CM_F_WALK, 0);
689 if (offset > iter->startbit) {
690 offset -= iter->startbit;
691 idx = offset / NETLBL_CATMAP_MAPSIZE;
692 bit = offset % NETLBL_CATMAP_MAPSIZE;
697 bitmask = NETLBL_CATMAP_BIT << bit;
700 bitmap = iter->bitmap[idx];
701 while (bitmask != 0 && (bitmap & bitmask) != 0) {
706 if (prev && idx == 0 && bit == 0)
707 return prev->startbit + NETLBL_CATMAP_SIZE - 1;
708 else if (bitmask != 0)
709 return iter->startbit +
710 (NETLBL_CATMAP_MAPSIZE * idx) + bit - 1;
711 else if (++idx >= NETLBL_CATMAP_MAPCNT) {
712 if (iter->next == NULL)
713 return iter->startbit + NETLBL_CATMAP_SIZE - 1;
718 bitmask = NETLBL_CATMAP_BIT;
726 * netlbl_catmap_getlong - Export an unsigned long bitmap
727 * @catmap: pointer to the category bitmap
728 * @offset: pointer to the requested offset
729 * @bitmap: the exported bitmap
732 * Export a bitmap with an offset greater than or equal to @offset and return
733 * it in @bitmap. The @offset must be aligned to an unsigned long and will be
734 * updated on return if different from what was requested; if the catmap is
735 * empty at the requested offset and beyond, the @offset is set to (u32)-1.
736 * Returns zero on sucess, negative values on failure.
739 int netlbl_catmap_getlong(struct netlbl_lsm_catmap *catmap,
741 unsigned long *bitmap)
743 struct netlbl_lsm_catmap *iter;
747 /* only allow aligned offsets */
748 if ((off & (BITS_PER_LONG - 1)) != 0)
751 if (off < catmap->startbit) {
752 off = catmap->startbit;
755 iter = _netlbl_catmap_getnode(&catmap, off, _CM_F_WALK, 0);
761 if (off < iter->startbit) {
762 *offset = iter->startbit;
765 off -= iter->startbit;
766 idx = off / NETLBL_CATMAP_MAPSIZE;
767 *bitmap = iter->bitmap[idx] >> (off % NETLBL_CATMAP_MAPSIZE);
773 * netlbl_catmap_setbit - Set a bit in a LSM secattr catmap
774 * @catmap: pointer to the category bitmap
775 * @bit: the bit to set
776 * @flags: memory allocation flags
779 * Set the bit specified by @bit in @catmap. Returns zero on success,
780 * negative values on failure.
783 int netlbl_catmap_setbit(struct netlbl_lsm_catmap **catmap,
787 struct netlbl_lsm_catmap *iter;
790 iter = _netlbl_catmap_getnode(catmap, bit, _CM_F_ALLOC, flags);
794 bit -= iter->startbit;
795 idx = bit / NETLBL_CATMAP_MAPSIZE;
796 iter->bitmap[idx] |= NETLBL_CATMAP_BIT << (bit % NETLBL_CATMAP_MAPSIZE);
800 EXPORT_SYMBOL(netlbl_catmap_setbit);
803 * netlbl_catmap_setrng - Set a range of bits in a LSM secattr catmap
804 * @catmap: pointer to the category bitmap
805 * @start: the starting bit
806 * @end: the last bit in the string
807 * @flags: memory allocation flags
810 * Set a range of bits, starting at @start and ending with @end. Returns zero
811 * on success, negative values on failure.
814 int netlbl_catmap_setrng(struct netlbl_lsm_catmap **catmap,
822 while (rc == 0 && spot <= end) {
823 if (((spot & (BITS_PER_LONG - 1)) == 0) &&
824 ((end - spot) > BITS_PER_LONG)) {
825 rc = netlbl_catmap_setlong(catmap,
829 spot += BITS_PER_LONG;
831 rc = netlbl_catmap_setbit(catmap, spot++, flags);
838 * netlbl_catmap_setlong - Import an unsigned long bitmap
839 * @catmap: pointer to the category bitmap
840 * @offset: offset to the start of the imported bitmap
841 * @bitmap: the bitmap to import
842 * @flags: memory allocation flags
845 * Import the bitmap specified in @bitmap into @catmap, using the offset
846 * in @offset. The offset must be aligned to an unsigned long. Returns zero
847 * on success, negative values on failure.
850 int netlbl_catmap_setlong(struct netlbl_lsm_catmap **catmap,
852 unsigned long bitmap,
855 struct netlbl_lsm_catmap *iter;
858 /* only allow aligned offsets */
859 if ((offset & (BITS_PER_LONG - 1)) != 0)
862 iter = _netlbl_catmap_getnode(catmap, offset, _CM_F_ALLOC, flags);
866 offset -= iter->startbit;
867 idx = offset / NETLBL_CATMAP_MAPSIZE;
868 iter->bitmap[idx] |= bitmap << (offset % NETLBL_CATMAP_MAPSIZE);
877 * netlbl_bitmap_walk - Walk a bitmap looking for a bit
878 * @bitmap: the bitmap
879 * @bitmap_len: length in bits
880 * @offset: starting offset
881 * @state: if non-zero, look for a set (1) bit else look for a cleared (0) bit
884 * Starting at @offset, walk the bitmap from left to right until either the
885 * desired bit is found or we reach the end. Return the bit offset, -1 if
886 * not found, or -2 if error.
888 int netlbl_bitmap_walk(const unsigned char *bitmap, u32 bitmap_len,
889 u32 offset, u8 state)
893 unsigned char bitmask;
896 byte_offset = offset / 8;
897 byte = bitmap[byte_offset];
899 bitmask = 0x80 >> (offset % 8);
901 while (bit_spot < bitmap_len) {
902 if ((state && (byte & bitmask) == bitmask) ||
903 (state == 0 && (byte & bitmask) == 0))
909 byte = bitmap[++byte_offset];
916 EXPORT_SYMBOL(netlbl_bitmap_walk);
919 * netlbl_bitmap_setbit - Sets a single bit in a bitmap
920 * @bitmap: the bitmap
922 * @state: if non-zero, set the bit (1) else clear the bit (0)
925 * Set a single bit in the bitmask. Returns zero on success, negative values
928 void netlbl_bitmap_setbit(unsigned char *bitmap, u32 bit, u8 state)
933 /* gcc always rounds to zero when doing integer division */
935 bitmask = 0x80 >> (bit % 8);
937 bitmap[byte_spot] |= bitmask;
939 bitmap[byte_spot] &= ~bitmask;
941 EXPORT_SYMBOL(netlbl_bitmap_setbit);
948 * netlbl_enabled - Determine if the NetLabel subsystem is enabled
951 * The LSM can use this function to determine if it should use NetLabel
952 * security attributes in it's enforcement mechanism. Currently, NetLabel is
953 * considered to be enabled when it's configuration contains a valid setup for
954 * at least one labeled protocol (i.e. NetLabel can understand incoming
955 * labeled packets of at least one type); otherwise NetLabel is considered to
959 int netlbl_enabled(void)
961 /* At some point we probably want to expose this mechanism to the user
962 * as well so that admins can toggle NetLabel regardless of the
964 return (atomic_read(&netlabel_mgmt_protocount) > 0);
968 * netlbl_sock_setattr - Label a socket using the correct protocol
969 * @sk: the socket to label
970 * @family: protocol family
971 * @secattr: the security attributes
974 * Attach the correct label to the given socket using the security attributes
975 * specified in @secattr. This function requires exclusive access to @sk,
976 * which means it either needs to be in the process of being created or locked.
977 * Returns zero on success, -EDESTADDRREQ if the domain is configured to use
978 * network address selectors (can't blindly label the socket), and negative
979 * values on all other failures.
982 int netlbl_sock_setattr(struct sock *sk,
984 const struct netlbl_lsm_secattr *secattr)
987 struct netlbl_dom_map *dom_entry;
990 dom_entry = netlbl_domhsh_getentry(secattr->domain, family);
991 if (dom_entry == NULL) {
993 goto socket_setattr_return;
997 switch (dom_entry->def.type) {
998 case NETLBL_NLTYPE_ADDRSELECT:
999 ret_val = -EDESTADDRREQ;
1001 case NETLBL_NLTYPE_CIPSOV4:
1002 ret_val = cipso_v4_sock_setattr(sk,
1003 dom_entry->def.cipso,
1006 case NETLBL_NLTYPE_UNLABELED:
1013 #if IS_ENABLED(CONFIG_IPV6)
1015 switch (dom_entry->def.type) {
1016 case NETLBL_NLTYPE_ADDRSELECT:
1017 ret_val = -EDESTADDRREQ;
1019 case NETLBL_NLTYPE_CALIPSO:
1020 ret_val = calipso_sock_setattr(sk,
1021 dom_entry->def.calipso,
1024 case NETLBL_NLTYPE_UNLABELED:
1033 ret_val = -EPROTONOSUPPORT;
1036 socket_setattr_return:
1042 * netlbl_sock_delattr - Delete all the NetLabel labels on a socket
1046 * Remove all the NetLabel labeling from @sk. The caller is responsible for
1047 * ensuring that @sk is locked.
1050 void netlbl_sock_delattr(struct sock *sk)
1052 switch (sk->sk_family) {
1054 cipso_v4_sock_delattr(sk);
1056 #if IS_ENABLED(CONFIG_IPV6)
1058 calipso_sock_delattr(sk);
1065 * netlbl_sock_getattr - Determine the security attributes of a sock
1067 * @secattr: the security attributes
1070 * Examines the given sock to see if any NetLabel style labeling has been
1071 * applied to the sock, if so it parses the socket label and returns the
1072 * security attributes in @secattr. Returns zero on success, negative values
1076 int netlbl_sock_getattr(struct sock *sk,
1077 struct netlbl_lsm_secattr *secattr)
1081 switch (sk->sk_family) {
1083 ret_val = cipso_v4_sock_getattr(sk, secattr);
1085 #if IS_ENABLED(CONFIG_IPV6)
1087 ret_val = calipso_sock_getattr(sk, secattr);
1091 ret_val = -EPROTONOSUPPORT;
1098 * netlbl_conn_setattr - Label a connected socket using the correct protocol
1099 * @sk: the socket to label
1100 * @addr: the destination address
1101 * @secattr: the security attributes
1104 * Attach the correct label to the given connected socket using the security
1105 * attributes specified in @secattr. The caller is responsible for ensuring
1106 * that @sk is locked. Returns zero on success, negative values on failure.
1109 int netlbl_conn_setattr(struct sock *sk,
1110 struct sockaddr *addr,
1111 const struct netlbl_lsm_secattr *secattr)
1114 struct sockaddr_in *addr4;
1115 #if IS_ENABLED(CONFIG_IPV6)
1116 struct sockaddr_in6 *addr6;
1118 struct netlbl_dommap_def *entry;
1121 switch (addr->sa_family) {
1123 addr4 = (struct sockaddr_in *)addr;
1124 entry = netlbl_domhsh_getentry_af4(secattr->domain,
1125 addr4->sin_addr.s_addr);
1126 if (entry == NULL) {
1128 goto conn_setattr_return;
1130 switch (entry->type) {
1131 case NETLBL_NLTYPE_CIPSOV4:
1132 ret_val = cipso_v4_sock_setattr(sk,
1133 entry->cipso, secattr);
1135 case NETLBL_NLTYPE_UNLABELED:
1136 /* just delete the protocols we support for right now
1137 * but we could remove other protocols if needed */
1138 netlbl_sock_delattr(sk);
1145 #if IS_ENABLED(CONFIG_IPV6)
1147 addr6 = (struct sockaddr_in6 *)addr;
1148 entry = netlbl_domhsh_getentry_af6(secattr->domain,
1150 if (entry == NULL) {
1152 goto conn_setattr_return;
1154 switch (entry->type) {
1155 case NETLBL_NLTYPE_CALIPSO:
1156 ret_val = calipso_sock_setattr(sk,
1157 entry->calipso, secattr);
1159 case NETLBL_NLTYPE_UNLABELED:
1160 /* just delete the protocols we support for right now
1161 * but we could remove other protocols if needed */
1162 netlbl_sock_delattr(sk);
1171 ret_val = -EPROTONOSUPPORT;
1174 conn_setattr_return:
1180 * netlbl_req_setattr - Label a request socket using the correct protocol
1181 * @req: the request socket to label
1182 * @secattr: the security attributes
1185 * Attach the correct label to the given socket using the security attributes
1186 * specified in @secattr. Returns zero on success, negative values on failure.
1189 int netlbl_req_setattr(struct request_sock *req,
1190 const struct netlbl_lsm_secattr *secattr)
1193 struct netlbl_dommap_def *entry;
1194 struct inet_request_sock *ireq = inet_rsk(req);
1197 switch (req->rsk_ops->family) {
1199 entry = netlbl_domhsh_getentry_af4(secattr->domain,
1201 if (entry == NULL) {
1203 goto req_setattr_return;
1205 switch (entry->type) {
1206 case NETLBL_NLTYPE_CIPSOV4:
1207 ret_val = cipso_v4_req_setattr(req,
1208 entry->cipso, secattr);
1210 case NETLBL_NLTYPE_UNLABELED:
1211 netlbl_req_delattr(req);
1218 #if IS_ENABLED(CONFIG_IPV6)
1220 entry = netlbl_domhsh_getentry_af6(secattr->domain,
1221 &ireq->ir_v6_rmt_addr);
1222 if (entry == NULL) {
1224 goto req_setattr_return;
1226 switch (entry->type) {
1227 case NETLBL_NLTYPE_CALIPSO:
1228 ret_val = calipso_req_setattr(req,
1229 entry->calipso, secattr);
1231 case NETLBL_NLTYPE_UNLABELED:
1232 netlbl_req_delattr(req);
1241 ret_val = -EPROTONOSUPPORT;
1250 * netlbl_req_delattr - Delete all the NetLabel labels on a socket
1254 * Remove all the NetLabel labeling from @req.
1257 void netlbl_req_delattr(struct request_sock *req)
1259 switch (req->rsk_ops->family) {
1261 cipso_v4_req_delattr(req);
1263 #if IS_ENABLED(CONFIG_IPV6)
1265 calipso_req_delattr(req);
1272 * netlbl_skbuff_setattr - Label a packet using the correct protocol
1274 * @family: protocol family
1275 * @secattr: the security attributes
1278 * Attach the correct label to the given packet using the security attributes
1279 * specified in @secattr. Returns zero on success, negative values on failure.
1282 int netlbl_skbuff_setattr(struct sk_buff *skb,
1284 const struct netlbl_lsm_secattr *secattr)
1288 #if IS_ENABLED(CONFIG_IPV6)
1289 struct ipv6hdr *hdr6;
1291 struct netlbl_dommap_def *entry;
1297 entry = netlbl_domhsh_getentry_af4(secattr->domain,
1299 if (entry == NULL) {
1301 goto skbuff_setattr_return;
1303 switch (entry->type) {
1304 case NETLBL_NLTYPE_CIPSOV4:
1305 ret_val = cipso_v4_skbuff_setattr(skb, entry->cipso,
1308 case NETLBL_NLTYPE_UNLABELED:
1309 /* just delete the protocols we support for right now
1310 * but we could remove other protocols if needed */
1311 ret_val = cipso_v4_skbuff_delattr(skb);
1317 #if IS_ENABLED(CONFIG_IPV6)
1319 hdr6 = ipv6_hdr(skb);
1320 entry = netlbl_domhsh_getentry_af6(secattr->domain,
1322 if (entry == NULL) {
1324 goto skbuff_setattr_return;
1326 switch (entry->type) {
1327 case NETLBL_NLTYPE_CALIPSO:
1328 ret_val = calipso_skbuff_setattr(skb, entry->calipso,
1331 case NETLBL_NLTYPE_UNLABELED:
1332 /* just delete the protocols we support for right now
1333 * but we could remove other protocols if needed */
1334 ret_val = calipso_skbuff_delattr(skb);
1342 ret_val = -EPROTONOSUPPORT;
1345 skbuff_setattr_return:
1351 * netlbl_skbuff_getattr - Determine the security attributes of a packet
1353 * @family: protocol family
1354 * @secattr: the security attributes
1357 * Examines the given packet to see if a recognized form of packet labeling
1358 * is present, if so it parses the packet label and returns the security
1359 * attributes in @secattr. Returns zero on success, negative values on
1363 int netlbl_skbuff_getattr(const struct sk_buff *skb,
1365 struct netlbl_lsm_secattr *secattr)
1371 ptr = cipso_v4_optptr(skb);
1372 if (ptr && cipso_v4_getattr(ptr, secattr) == 0)
1375 #if IS_ENABLED(CONFIG_IPV6)
1377 ptr = calipso_optptr(skb);
1378 if (ptr && calipso_getattr(ptr, secattr) == 0)
1384 return netlbl_unlabel_getattr(skb, family, secattr);
1388 * netlbl_skbuff_err - Handle a LSM error on a sk_buff
1390 * @family: the family
1391 * @error: the error code
1392 * @gateway: true if host is acting as a gateway, false otherwise
1395 * Deal with a LSM problem when handling the packet in @skb, typically this is
1396 * a permission denied problem (-EACCES). The correct action is determined
1397 * according to the packet's labeling protocol.
1400 void netlbl_skbuff_err(struct sk_buff *skb, u16 family, int error, int gateway)
1404 if (cipso_v4_optptr(skb))
1405 cipso_v4_error(skb, error, gateway);
1411 * netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches
1414 * For all of the NetLabel protocols that support some form of label mapping
1415 * cache, invalidate the cache. Returns zero on success, negative values on
1419 void netlbl_cache_invalidate(void)
1421 cipso_v4_cache_invalidate();
1422 #if IS_ENABLED(CONFIG_IPV6)
1423 calipso_cache_invalidate();
1428 * netlbl_cache_add - Add an entry to a NetLabel protocol cache
1430 * @family: the family
1431 * @secattr: the packet's security attributes
1434 * Add the LSM security attributes for the given packet to the underlying
1435 * NetLabel protocol's label mapping cache. Returns zero on success, negative
1439 int netlbl_cache_add(const struct sk_buff *skb, u16 family,
1440 const struct netlbl_lsm_secattr *secattr)
1444 if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0)
1449 ptr = cipso_v4_optptr(skb);
1451 return cipso_v4_cache_add(ptr, secattr);
1453 #if IS_ENABLED(CONFIG_IPV6)
1455 ptr = calipso_optptr(skb);
1457 return calipso_cache_add(ptr, secattr);
1465 * Protocol Engine Functions
1469 * netlbl_audit_start - Start an audit message
1470 * @type: audit message type
1471 * @audit_info: NetLabel audit information
1474 * Start an audit message using the type specified in @type and fill the audit
1475 * message with some fields common to all NetLabel audit messages. This
1476 * function should only be used by protocol engines, not LSMs. Returns a
1477 * pointer to the audit buffer on success, NULL on failure.
1480 struct audit_buffer *netlbl_audit_start(int type,
1481 struct netlbl_audit *audit_info)
1483 return netlbl_audit_start_common(type, audit_info);
1485 EXPORT_SYMBOL(netlbl_audit_start);
1492 * netlbl_init - Initialize NetLabel
1495 * Perform the required NetLabel initialization before first use.
1498 static int __init netlbl_init(void)
1502 printk(KERN_INFO "NetLabel: Initializing\n");
1503 printk(KERN_INFO "NetLabel: domain hash size = %u\n",
1504 (1 << NETLBL_DOMHSH_BITSIZE));
1505 printk(KERN_INFO "NetLabel: protocols = UNLABELED CIPSOv4 CALIPSO\n");
1507 ret_val = netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE);
1511 ret_val = netlbl_unlabel_init(NETLBL_UNLHSH_BITSIZE);
1515 ret_val = netlbl_netlink_init();
1519 ret_val = netlbl_unlabel_defconf();
1522 printk(KERN_INFO "NetLabel: unlabeled traffic allowed by default\n");
1527 panic("NetLabel: failed to initialize properly (%d)\n", ret_val);
1530 subsys_initcall(netlbl_init);