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
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 success, 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] |= (NETLBL_CATMAP_MAPTYPE)bitmap
861 << (offset % NETLBL_CATMAP_MAPSIZE);
870 * netlbl_bitmap_walk - Walk a bitmap looking for a bit
871 * @bitmap: the bitmap
872 * @bitmap_len: length in bits
873 * @offset: starting offset
874 * @state: if non-zero, look for a set (1) bit else look for a cleared (0) bit
877 * Starting at @offset, walk the bitmap from left to right until either the
878 * desired bit is found or we reach the end. Return the bit offset, -1 if
879 * not found, or -2 if error.
881 int netlbl_bitmap_walk(const unsigned char *bitmap, u32 bitmap_len,
882 u32 offset, u8 state)
886 unsigned char bitmask;
889 if (offset >= bitmap_len)
891 byte_offset = offset / 8;
892 byte = bitmap[byte_offset];
894 bitmask = 0x80 >> (offset % 8);
896 while (bit_spot < bitmap_len) {
897 if ((state && (byte & bitmask) == bitmask) ||
898 (state == 0 && (byte & bitmask) == 0))
901 if (++bit_spot >= bitmap_len)
905 byte = bitmap[++byte_offset];
912 EXPORT_SYMBOL(netlbl_bitmap_walk);
915 * netlbl_bitmap_setbit - Sets a single bit in a bitmap
916 * @bitmap: the bitmap
918 * @state: if non-zero, set the bit (1) else clear the bit (0)
921 * Set a single bit in the bitmask. Returns zero on success, negative values
924 void netlbl_bitmap_setbit(unsigned char *bitmap, u32 bit, u8 state)
929 /* gcc always rounds to zero when doing integer division */
931 bitmask = 0x80 >> (bit % 8);
933 bitmap[byte_spot] |= bitmask;
935 bitmap[byte_spot] &= ~bitmask;
937 EXPORT_SYMBOL(netlbl_bitmap_setbit);
944 * netlbl_enabled - Determine if the NetLabel subsystem is enabled
947 * The LSM can use this function to determine if it should use NetLabel
948 * security attributes in it's enforcement mechanism. Currently, NetLabel is
949 * considered to be enabled when it's configuration contains a valid setup for
950 * at least one labeled protocol (i.e. NetLabel can understand incoming
951 * labeled packets of at least one type); otherwise NetLabel is considered to
955 int netlbl_enabled(void)
957 /* At some point we probably want to expose this mechanism to the user
958 * as well so that admins can toggle NetLabel regardless of the
960 return (atomic_read(&netlabel_mgmt_protocount) > 0);
964 * netlbl_sock_setattr - Label a socket using the correct protocol
965 * @sk: the socket to label
966 * @family: protocol family
967 * @secattr: the security attributes
970 * Attach the correct label to the given socket using the security attributes
971 * specified in @secattr. This function requires exclusive access to @sk,
972 * which means it either needs to be in the process of being created or locked.
973 * Returns zero on success, -EDESTADDRREQ if the domain is configured to use
974 * network address selectors (can't blindly label the socket), and negative
975 * values on all other failures.
978 int netlbl_sock_setattr(struct sock *sk,
980 const struct netlbl_lsm_secattr *secattr)
983 struct netlbl_dom_map *dom_entry;
986 dom_entry = netlbl_domhsh_getentry(secattr->domain, family);
987 if (dom_entry == NULL) {
989 goto socket_setattr_return;
993 switch (dom_entry->def.type) {
994 case NETLBL_NLTYPE_ADDRSELECT:
995 ret_val = -EDESTADDRREQ;
997 case NETLBL_NLTYPE_CIPSOV4:
998 ret_val = cipso_v4_sock_setattr(sk,
999 dom_entry->def.cipso,
1002 case NETLBL_NLTYPE_UNLABELED:
1009 #if IS_ENABLED(CONFIG_IPV6)
1011 switch (dom_entry->def.type) {
1012 case NETLBL_NLTYPE_ADDRSELECT:
1013 ret_val = -EDESTADDRREQ;
1015 case NETLBL_NLTYPE_CALIPSO:
1016 ret_val = calipso_sock_setattr(sk,
1017 dom_entry->def.calipso,
1020 case NETLBL_NLTYPE_UNLABELED:
1029 ret_val = -EPROTONOSUPPORT;
1032 socket_setattr_return:
1038 * netlbl_sock_delattr - Delete all the NetLabel labels on a socket
1042 * Remove all the NetLabel labeling from @sk. The caller is responsible for
1043 * ensuring that @sk is locked.
1046 void netlbl_sock_delattr(struct sock *sk)
1048 switch (sk->sk_family) {
1050 cipso_v4_sock_delattr(sk);
1052 #if IS_ENABLED(CONFIG_IPV6)
1054 calipso_sock_delattr(sk);
1061 * netlbl_sock_getattr - Determine the security attributes of a sock
1063 * @secattr: the security attributes
1066 * Examines the given sock to see if any NetLabel style labeling has been
1067 * applied to the sock, if so it parses the socket label and returns the
1068 * security attributes in @secattr. Returns zero on success, negative values
1072 int netlbl_sock_getattr(struct sock *sk,
1073 struct netlbl_lsm_secattr *secattr)
1077 switch (sk->sk_family) {
1079 ret_val = cipso_v4_sock_getattr(sk, secattr);
1081 #if IS_ENABLED(CONFIG_IPV6)
1083 ret_val = calipso_sock_getattr(sk, secattr);
1087 ret_val = -EPROTONOSUPPORT;
1094 * netlbl_conn_setattr - Label a connected socket using the correct protocol
1095 * @sk: the socket to label
1096 * @addr: the destination address
1097 * @secattr: the security attributes
1100 * Attach the correct label to the given connected socket using the security
1101 * attributes specified in @secattr. The caller is responsible for ensuring
1102 * that @sk is locked. Returns zero on success, negative values on failure.
1105 int netlbl_conn_setattr(struct sock *sk,
1106 struct sockaddr *addr,
1107 const struct netlbl_lsm_secattr *secattr)
1110 struct sockaddr_in *addr4;
1111 #if IS_ENABLED(CONFIG_IPV6)
1112 struct sockaddr_in6 *addr6;
1114 struct netlbl_dommap_def *entry;
1117 switch (addr->sa_family) {
1119 addr4 = (struct sockaddr_in *)addr;
1120 entry = netlbl_domhsh_getentry_af4(secattr->domain,
1121 addr4->sin_addr.s_addr);
1122 if (entry == NULL) {
1124 goto conn_setattr_return;
1126 switch (entry->type) {
1127 case NETLBL_NLTYPE_CIPSOV4:
1128 ret_val = cipso_v4_sock_setattr(sk,
1129 entry->cipso, secattr);
1131 case NETLBL_NLTYPE_UNLABELED:
1132 /* just delete the protocols we support for right now
1133 * but we could remove other protocols if needed */
1134 netlbl_sock_delattr(sk);
1141 #if IS_ENABLED(CONFIG_IPV6)
1143 addr6 = (struct sockaddr_in6 *)addr;
1144 entry = netlbl_domhsh_getentry_af6(secattr->domain,
1146 if (entry == NULL) {
1148 goto conn_setattr_return;
1150 switch (entry->type) {
1151 case NETLBL_NLTYPE_CALIPSO:
1152 ret_val = calipso_sock_setattr(sk,
1153 entry->calipso, secattr);
1155 case NETLBL_NLTYPE_UNLABELED:
1156 /* just delete the protocols we support for right now
1157 * but we could remove other protocols if needed */
1158 netlbl_sock_delattr(sk);
1167 ret_val = -EPROTONOSUPPORT;
1170 conn_setattr_return:
1176 * netlbl_req_setattr - Label a request socket using the correct protocol
1177 * @req: the request socket to label
1178 * @secattr: the security attributes
1181 * Attach the correct label to the given socket using the security attributes
1182 * specified in @secattr. Returns zero on success, negative values on failure.
1185 int netlbl_req_setattr(struct request_sock *req,
1186 const struct netlbl_lsm_secattr *secattr)
1189 struct netlbl_dommap_def *entry;
1190 struct inet_request_sock *ireq = inet_rsk(req);
1193 switch (req->rsk_ops->family) {
1195 entry = netlbl_domhsh_getentry_af4(secattr->domain,
1197 if (entry == NULL) {
1199 goto req_setattr_return;
1201 switch (entry->type) {
1202 case NETLBL_NLTYPE_CIPSOV4:
1203 ret_val = cipso_v4_req_setattr(req,
1204 entry->cipso, secattr);
1206 case NETLBL_NLTYPE_UNLABELED:
1207 netlbl_req_delattr(req);
1214 #if IS_ENABLED(CONFIG_IPV6)
1216 entry = netlbl_domhsh_getentry_af6(secattr->domain,
1217 &ireq->ir_v6_rmt_addr);
1218 if (entry == NULL) {
1220 goto req_setattr_return;
1222 switch (entry->type) {
1223 case NETLBL_NLTYPE_CALIPSO:
1224 ret_val = calipso_req_setattr(req,
1225 entry->calipso, secattr);
1227 case NETLBL_NLTYPE_UNLABELED:
1228 netlbl_req_delattr(req);
1237 ret_val = -EPROTONOSUPPORT;
1246 * netlbl_req_delattr - Delete all the NetLabel labels on a socket
1250 * Remove all the NetLabel labeling from @req.
1253 void netlbl_req_delattr(struct request_sock *req)
1255 switch (req->rsk_ops->family) {
1257 cipso_v4_req_delattr(req);
1259 #if IS_ENABLED(CONFIG_IPV6)
1261 calipso_req_delattr(req);
1268 * netlbl_skbuff_setattr - Label a packet using the correct protocol
1270 * @family: protocol family
1271 * @secattr: the security attributes
1274 * Attach the correct label to the given packet using the security attributes
1275 * specified in @secattr. Returns zero on success, negative values on failure.
1278 int netlbl_skbuff_setattr(struct sk_buff *skb,
1280 const struct netlbl_lsm_secattr *secattr)
1284 #if IS_ENABLED(CONFIG_IPV6)
1285 struct ipv6hdr *hdr6;
1287 struct netlbl_dommap_def *entry;
1293 entry = netlbl_domhsh_getentry_af4(secattr->domain,
1295 if (entry == NULL) {
1297 goto skbuff_setattr_return;
1299 switch (entry->type) {
1300 case NETLBL_NLTYPE_CIPSOV4:
1301 ret_val = cipso_v4_skbuff_setattr(skb, entry->cipso,
1304 case NETLBL_NLTYPE_UNLABELED:
1305 /* just delete the protocols we support for right now
1306 * but we could remove other protocols if needed */
1307 ret_val = cipso_v4_skbuff_delattr(skb);
1313 #if IS_ENABLED(CONFIG_IPV6)
1315 hdr6 = ipv6_hdr(skb);
1316 entry = netlbl_domhsh_getentry_af6(secattr->domain,
1318 if (entry == NULL) {
1320 goto skbuff_setattr_return;
1322 switch (entry->type) {
1323 case NETLBL_NLTYPE_CALIPSO:
1324 ret_val = calipso_skbuff_setattr(skb, entry->calipso,
1327 case NETLBL_NLTYPE_UNLABELED:
1328 /* just delete the protocols we support for right now
1329 * but we could remove other protocols if needed */
1330 ret_val = calipso_skbuff_delattr(skb);
1338 ret_val = -EPROTONOSUPPORT;
1341 skbuff_setattr_return:
1347 * netlbl_skbuff_getattr - Determine the security attributes of a packet
1349 * @family: protocol family
1350 * @secattr: the security attributes
1353 * Examines the given packet to see if a recognized form of packet labeling
1354 * is present, if so it parses the packet label and returns the security
1355 * attributes in @secattr. Returns zero on success, negative values on
1359 int netlbl_skbuff_getattr(const struct sk_buff *skb,
1361 struct netlbl_lsm_secattr *secattr)
1367 ptr = cipso_v4_optptr(skb);
1368 if (ptr && cipso_v4_getattr(ptr, secattr) == 0)
1371 #if IS_ENABLED(CONFIG_IPV6)
1373 ptr = calipso_optptr(skb);
1374 if (ptr && calipso_getattr(ptr, secattr) == 0)
1380 return netlbl_unlabel_getattr(skb, family, secattr);
1384 * netlbl_skbuff_err - Handle a LSM error on a sk_buff
1386 * @family: the family
1387 * @error: the error code
1388 * @gateway: true if host is acting as a gateway, false otherwise
1391 * Deal with a LSM problem when handling the packet in @skb, typically this is
1392 * a permission denied problem (-EACCES). The correct action is determined
1393 * according to the packet's labeling protocol.
1396 void netlbl_skbuff_err(struct sk_buff *skb, u16 family, int error, int gateway)
1400 if (cipso_v4_optptr(skb))
1401 cipso_v4_error(skb, error, gateway);
1407 * netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches
1410 * For all of the NetLabel protocols that support some form of label mapping
1411 * cache, invalidate the cache. Returns zero on success, negative values on
1415 void netlbl_cache_invalidate(void)
1417 cipso_v4_cache_invalidate();
1418 #if IS_ENABLED(CONFIG_IPV6)
1419 calipso_cache_invalidate();
1424 * netlbl_cache_add - Add an entry to a NetLabel protocol cache
1426 * @family: the family
1427 * @secattr: the packet's security attributes
1430 * Add the LSM security attributes for the given packet to the underlying
1431 * NetLabel protocol's label mapping cache. Returns zero on success, negative
1435 int netlbl_cache_add(const struct sk_buff *skb, u16 family,
1436 const struct netlbl_lsm_secattr *secattr)
1440 if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0)
1445 ptr = cipso_v4_optptr(skb);
1447 return cipso_v4_cache_add(ptr, secattr);
1449 #if IS_ENABLED(CONFIG_IPV6)
1451 ptr = calipso_optptr(skb);
1453 return calipso_cache_add(ptr, secattr);
1461 * Protocol Engine Functions
1465 * netlbl_audit_start - Start an audit message
1466 * @type: audit message type
1467 * @audit_info: NetLabel audit information
1470 * Start an audit message using the type specified in @type and fill the audit
1471 * message with some fields common to all NetLabel audit messages. This
1472 * function should only be used by protocol engines, not LSMs. Returns a
1473 * pointer to the audit buffer on success, NULL on failure.
1476 struct audit_buffer *netlbl_audit_start(int type,
1477 struct netlbl_audit *audit_info)
1479 return netlbl_audit_start_common(type, audit_info);
1481 EXPORT_SYMBOL(netlbl_audit_start);
1488 * netlbl_init - Initialize NetLabel
1491 * Perform the required NetLabel initialization before first use.
1494 static int __init netlbl_init(void)
1498 printk(KERN_INFO "NetLabel: Initializing\n");
1499 printk(KERN_INFO "NetLabel: domain hash size = %u\n",
1500 (1 << NETLBL_DOMHSH_BITSIZE));
1501 printk(KERN_INFO "NetLabel: protocols = UNLABELED CIPSOv4 CALIPSO\n");
1503 ret_val = netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE);
1507 ret_val = netlbl_unlabel_init(NETLBL_UNLHSH_BITSIZE);
1511 ret_val = netlbl_netlink_init();
1515 ret_val = netlbl_unlabel_defconf();
1518 printk(KERN_INFO "NetLabel: unlabeled traffic allowed by default\n");
1523 panic("NetLabel: failed to initialize properly (%d)\n", ret_val);
1526 subsys_initcall(netlbl_init);