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
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>
35 #include <linux/in6.h>
38 #include <net/netlabel.h>
39 #include <net/cipso_ipv4.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
55 * netlbl_cfg_map_del - Remove a NetLabel/LSM domain mapping
56 * @domain: the domain mapping to remove
57 * @family: address family
59 * @mask: IP address mask
60 * @audit_info: NetLabel audit information
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
68 int netlbl_cfg_map_del(const char *domain,
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) {
79 return netlbl_domhsh_remove_af4(domain, addr, mask,
89 * netlbl_cfg_unlbl_map_add - Add a new unlabeled mapping
90 * @domain: the domain mapping to add
91 * @family: address family
93 * @mask: IP address mask
94 * @audit_info: NetLabel audit information
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,
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);
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);
128 goto cfg_unlbl_map_add_failure;
129 INIT_LIST_HEAD(&addrmap->list4);
130 INIT_LIST_HEAD(&addrmap->list6);
134 const struct in_addr *addr4 = addr;
135 const struct in_addr *mask4 = mask;
136 map4 = kzalloc(sizeof(*map4), GFP_ATOMIC);
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,
146 goto cfg_unlbl_map_add_failure;
149 #if IS_ENABLED(CONFIG_IPV6)
151 const struct in6_addr *addr6 = addr;
152 const struct in6_addr *mask6 = mask;
153 map6 = kzalloc(sizeof(*map6), GFP_ATOMIC);
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,
167 goto cfg_unlbl_map_add_failure;
172 goto cfg_unlbl_map_add_failure;
175 entry->def.addrsel = addrmap;
176 entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
179 goto cfg_unlbl_map_add_failure;
182 ret_val = netlbl_domhsh_add(entry, audit_info);
184 goto cfg_unlbl_map_add_failure;
188 cfg_unlbl_map_add_failure:
189 kfree(entry->domain);
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
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,
220 struct netlbl_audit *audit_info)
226 addr_len = sizeof(struct in_addr);
228 #if IS_ENABLED(CONFIG_IPV6)
230 addr_len = sizeof(struct in6_addr);
234 return -EPFNOSUPPORT;
237 return netlbl_unlhsh_add(net,
238 dev_name, addr, mask, addr_len,
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 * @secid: LSM secid value for the entry
250 * @audit_info: NetLabel audit information
253 * Removes an existing NetLabel static label used when protocol provided labels
254 * are not present on incoming traffic. If @dev_name is NULL then the default
255 * interface will be used. Returns zero on success, negative values on failure.
258 int netlbl_cfg_unlbl_static_del(struct net *net,
259 const char *dev_name,
263 struct netlbl_audit *audit_info)
269 addr_len = sizeof(struct in_addr);
271 #if IS_ENABLED(CONFIG_IPV6)
273 addr_len = sizeof(struct in6_addr);
277 return -EPFNOSUPPORT;
280 return netlbl_unlhsh_remove(net,
281 dev_name, addr, mask, addr_len,
286 * netlbl_cfg_cipsov4_add - Add a new CIPSOv4 DOI definition
287 * @doi_def: CIPSO DOI definition
288 * @audit_info: NetLabel audit information
291 * Add a new CIPSO DOI definition as defined by @doi_def. Returns zero on
292 * success and negative values on failure.
295 int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def,
296 struct netlbl_audit *audit_info)
298 return cipso_v4_doi_add(doi_def, audit_info);
302 * netlbl_cfg_cipsov4_del - Remove an existing CIPSOv4 DOI definition
304 * @audit_info: NetLabel audit information
307 * Remove an existing CIPSO DOI definition matching @doi. Returns zero on
308 * success and negative values on failure.
311 void netlbl_cfg_cipsov4_del(u32 doi, struct netlbl_audit *audit_info)
313 cipso_v4_doi_remove(doi, audit_info);
317 * netlbl_cfg_cipsov4_map_add - Add a new CIPSOv4 DOI mapping
318 * @doi: the CIPSO DOI
319 * @domain: the domain mapping to add
321 * @mask: IP address mask
322 * @audit_info: NetLabel audit information
325 * Add a new NetLabel/LSM domain mapping for the given CIPSO DOI to the NetLabel
326 * subsystem. A @domain value of NULL adds a new default domain mapping.
327 * Returns zero on success, negative values on failure.
330 int netlbl_cfg_cipsov4_map_add(u32 doi,
332 const struct in_addr *addr,
333 const struct in_addr *mask,
334 struct netlbl_audit *audit_info)
336 int ret_val = -ENOMEM;
337 struct cipso_v4_doi *doi_def;
338 struct netlbl_dom_map *entry;
339 struct netlbl_domaddr_map *addrmap = NULL;
340 struct netlbl_domaddr4_map *addrinfo = NULL;
342 doi_def = cipso_v4_doi_getdef(doi);
346 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
349 if (domain != NULL) {
350 entry->domain = kstrdup(domain, GFP_ATOMIC);
351 if (entry->domain == NULL)
355 if (addr == NULL && mask == NULL) {
356 entry->def.cipso = doi_def;
357 entry->def.type = NETLBL_NLTYPE_CIPSOV4;
358 } else if (addr != NULL && mask != NULL) {
359 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
362 INIT_LIST_HEAD(&addrmap->list4);
363 INIT_LIST_HEAD(&addrmap->list6);
365 addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC);
366 if (addrinfo == NULL)
368 addrinfo->def.cipso = doi_def;
369 addrinfo->def.type = NETLBL_NLTYPE_CIPSOV4;
370 addrinfo->list.addr = addr->s_addr & mask->s_addr;
371 addrinfo->list.mask = mask->s_addr;
372 addrinfo->list.valid = 1;
373 ret_val = netlbl_af4list_add(&addrinfo->list, &addrmap->list4);
375 goto cfg_cipsov4_map_add_failure;
377 entry->def.addrsel = addrmap;
378 entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
384 ret_val = netlbl_domhsh_add(entry, audit_info);
386 goto cfg_cipsov4_map_add_failure;
390 cfg_cipsov4_map_add_failure:
395 kfree(entry->domain);
399 cipso_v4_doi_putdef(doi_def);
404 * Security Attribute Functions
407 #define _CM_F_NONE 0x00000000
408 #define _CM_F_ALLOC 0x00000001
409 #define _CM_F_WALK 0x00000002
412 * _netlbl_catmap_getnode - Get a individual node from a catmap
413 * @catmap: pointer to the category bitmap
414 * @offset: the requested offset
415 * @cm_flags: catmap flags, see _CM_F_*
416 * @gfp_flags: memory allocation flags
419 * Iterate through the catmap looking for the node associated with @offset.
420 * If the _CM_F_ALLOC flag is set in @cm_flags and there is no associated node,
421 * one will be created and inserted into the catmap. If the _CM_F_WALK flag is
422 * set in @cm_flags and there is no associated node, the next highest node will
423 * be returned. Returns a pointer to the node on success, NULL on failure.
426 static struct netlbl_lsm_catmap *_netlbl_catmap_getnode(
427 struct netlbl_lsm_catmap **catmap,
429 unsigned int cm_flags,
432 struct netlbl_lsm_catmap *iter = *catmap;
433 struct netlbl_lsm_catmap *prev = NULL;
436 goto catmap_getnode_alloc;
437 if (offset < iter->startbit)
438 goto catmap_getnode_walk;
439 while (iter && offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
443 if (iter == NULL || offset < iter->startbit)
444 goto catmap_getnode_walk;
449 if (cm_flags & _CM_F_WALK)
451 catmap_getnode_alloc:
452 if (!(cm_flags & _CM_F_ALLOC))
455 iter = netlbl_catmap_alloc(gfp_flags);
458 iter->startbit = offset & ~(NETLBL_CATMAP_SIZE - 1);
461 iter->next = *catmap;
464 iter->next = prev->next;
472 * netlbl_catmap_walk - Walk a LSM secattr catmap looking for a bit
473 * @catmap: the category bitmap
474 * @offset: the offset to start searching at, in bits
477 * This function walks a LSM secattr category bitmap starting at @offset and
478 * returns the spot of the first set bit or -ENOENT if no bits are set.
481 int netlbl_catmap_walk(struct netlbl_lsm_catmap *catmap, u32 offset)
483 struct netlbl_lsm_catmap *iter = catmap;
486 NETLBL_CATMAP_MAPTYPE bitmap;
488 iter = _netlbl_catmap_getnode(&catmap, offset, _CM_F_WALK, 0);
491 if (offset > iter->startbit) {
492 offset -= iter->startbit;
493 idx = offset / NETLBL_CATMAP_MAPSIZE;
494 bit = offset % NETLBL_CATMAP_MAPSIZE;
499 bitmap = iter->bitmap[idx] >> bit;
503 while ((bitmap & NETLBL_CATMAP_BIT) == 0) {
507 return iter->startbit +
508 (NETLBL_CATMAP_MAPSIZE * idx) + bit;
510 if (++idx >= NETLBL_CATMAP_MAPCNT) {
511 if (iter->next != NULL) {
517 bitmap = iter->bitmap[idx];
525 * netlbl_catmap_walkrng - Find the end of a string of set bits
526 * @catmap: the category bitmap
527 * @offset: the offset to start searching at, in bits
530 * This function walks a LSM secattr category bitmap starting at @offset and
531 * returns the spot of the first cleared bit or -ENOENT if the offset is past
532 * the end of the bitmap.
535 int netlbl_catmap_walkrng(struct netlbl_lsm_catmap *catmap, u32 offset)
537 struct netlbl_lsm_catmap *iter;
538 struct netlbl_lsm_catmap *prev = NULL;
541 NETLBL_CATMAP_MAPTYPE bitmask;
542 NETLBL_CATMAP_MAPTYPE bitmap;
544 iter = _netlbl_catmap_getnode(&catmap, offset, _CM_F_WALK, 0);
547 if (offset > iter->startbit) {
548 offset -= iter->startbit;
549 idx = offset / NETLBL_CATMAP_MAPSIZE;
550 bit = offset % NETLBL_CATMAP_MAPSIZE;
555 bitmask = NETLBL_CATMAP_BIT << bit;
558 bitmap = iter->bitmap[idx];
559 while (bitmask != 0 && (bitmap & bitmask) != 0) {
564 if (prev && idx == 0 && bit == 0)
565 return prev->startbit + NETLBL_CATMAP_SIZE - 1;
566 else if (bitmask != 0)
567 return iter->startbit +
568 (NETLBL_CATMAP_MAPSIZE * idx) + bit - 1;
569 else if (++idx >= NETLBL_CATMAP_MAPCNT) {
570 if (iter->next == NULL)
571 return iter->startbit + NETLBL_CATMAP_SIZE - 1;
576 bitmask = NETLBL_CATMAP_BIT;
584 * netlbl_catmap_getlong - Export an unsigned long bitmap
585 * @catmap: pointer to the category bitmap
586 * @offset: pointer to the requested offset
587 * @bitmap: the exported bitmap
590 * Export a bitmap with an offset greater than or equal to @offset and return
591 * it in @bitmap. The @offset must be aligned to an unsigned long and will be
592 * updated on return if different from what was requested; if the catmap is
593 * empty at the requested offset and beyond, the @offset is set to (u32)-1.
594 * Returns zero on sucess, negative values on failure.
597 int netlbl_catmap_getlong(struct netlbl_lsm_catmap *catmap,
599 unsigned long *bitmap)
601 struct netlbl_lsm_catmap *iter;
605 /* only allow aligned offsets */
606 if ((off & (BITS_PER_LONG - 1)) != 0)
609 if (off < catmap->startbit) {
610 off = catmap->startbit;
613 iter = _netlbl_catmap_getnode(&catmap, off, _CM_F_NONE, 0);
619 if (off < iter->startbit) {
620 off = iter->startbit;
623 off -= iter->startbit;
625 idx = off / NETLBL_CATMAP_MAPSIZE;
626 *bitmap = iter->bitmap[idx] >> (off % NETLBL_CATMAP_SIZE);
632 * netlbl_catmap_setbit - Set a bit in a LSM secattr catmap
633 * @catmap: pointer to the category bitmap
634 * @bit: the bit to set
635 * @flags: memory allocation flags
638 * Set the bit specified by @bit in @catmap. Returns zero on success,
639 * negative values on failure.
642 int netlbl_catmap_setbit(struct netlbl_lsm_catmap **catmap,
646 struct netlbl_lsm_catmap *iter;
649 iter = _netlbl_catmap_getnode(catmap, bit, _CM_F_ALLOC, flags);
653 bit -= iter->startbit;
654 idx = bit / NETLBL_CATMAP_MAPSIZE;
655 iter->bitmap[idx] |= NETLBL_CATMAP_BIT << (bit % NETLBL_CATMAP_MAPSIZE);
661 * netlbl_catmap_setrng - Set a range of bits in a LSM secattr catmap
662 * @catmap: pointer to the category bitmap
663 * @start: the starting bit
664 * @end: the last bit in the string
665 * @flags: memory allocation flags
668 * Set a range of bits, starting at @start and ending with @end. Returns zero
669 * on success, negative values on failure.
672 int netlbl_catmap_setrng(struct netlbl_lsm_catmap **catmap,
680 while (rc == 0 && spot <= end) {
681 if (((spot & (BITS_PER_LONG - 1)) != 0) &&
682 ((end - spot) > BITS_PER_LONG)) {
683 rc = netlbl_catmap_setlong(catmap,
687 spot += BITS_PER_LONG;
689 rc = netlbl_catmap_setbit(catmap, spot++, flags);
696 * netlbl_catmap_setlong - Import an unsigned long bitmap
697 * @catmap: pointer to the category bitmap
698 * @offset: offset to the start of the imported bitmap
699 * @bitmap: the bitmap to import
700 * @flags: memory allocation flags
703 * Import the bitmap specified in @bitmap into @catmap, using the offset
704 * in @offset. The offset must be aligned to an unsigned long. Returns zero
705 * on success, negative values on failure.
708 int netlbl_catmap_setlong(struct netlbl_lsm_catmap **catmap,
710 unsigned long bitmap,
713 struct netlbl_lsm_catmap *iter;
716 /* only allow aligned offsets */
717 if ((offset & (BITS_PER_LONG - 1)) != 0)
720 iter = _netlbl_catmap_getnode(catmap, offset, _CM_F_ALLOC, flags);
724 offset -= iter->startbit;
725 idx = offset / NETLBL_CATMAP_MAPSIZE;
726 iter->bitmap[idx] |= bitmap << (offset % NETLBL_CATMAP_MAPSIZE);
736 * netlbl_enabled - Determine if the NetLabel subsystem is enabled
739 * The LSM can use this function to determine if it should use NetLabel
740 * security attributes in it's enforcement mechanism. Currently, NetLabel is
741 * considered to be enabled when it's configuration contains a valid setup for
742 * at least one labeled protocol (i.e. NetLabel can understand incoming
743 * labeled packets of at least one type); otherwise NetLabel is considered to
747 int netlbl_enabled(void)
749 /* At some point we probably want to expose this mechanism to the user
750 * as well so that admins can toggle NetLabel regardless of the
752 return (atomic_read(&netlabel_mgmt_protocount) > 0);
756 * netlbl_sock_setattr - Label a socket using the correct protocol
757 * @sk: the socket to label
758 * @family: protocol family
759 * @secattr: the security attributes
762 * Attach the correct label to the given socket using the security attributes
763 * specified in @secattr. This function requires exclusive access to @sk,
764 * which means it either needs to be in the process of being created or locked.
765 * Returns zero on success, -EDESTADDRREQ if the domain is configured to use
766 * network address selectors (can't blindly label the socket), and negative
767 * values on all other failures.
770 int netlbl_sock_setattr(struct sock *sk,
772 const struct netlbl_lsm_secattr *secattr)
775 struct netlbl_dom_map *dom_entry;
778 dom_entry = netlbl_domhsh_getentry(secattr->domain);
779 if (dom_entry == NULL) {
781 goto socket_setattr_return;
785 switch (dom_entry->def.type) {
786 case NETLBL_NLTYPE_ADDRSELECT:
787 ret_val = -EDESTADDRREQ;
789 case NETLBL_NLTYPE_CIPSOV4:
790 ret_val = cipso_v4_sock_setattr(sk,
791 dom_entry->def.cipso,
794 case NETLBL_NLTYPE_UNLABELED:
801 #if IS_ENABLED(CONFIG_IPV6)
803 /* since we don't support any IPv6 labeling protocols right
804 * now we can optimize everything away until we do */
809 ret_val = -EPROTONOSUPPORT;
812 socket_setattr_return:
818 * netlbl_sock_delattr - Delete all the NetLabel labels on a socket
822 * Remove all the NetLabel labeling from @sk. The caller is responsible for
823 * ensuring that @sk is locked.
826 void netlbl_sock_delattr(struct sock *sk)
828 cipso_v4_sock_delattr(sk);
832 * netlbl_sock_getattr - Determine the security attributes of a sock
834 * @secattr: the security attributes
837 * Examines the given sock to see if any NetLabel style labeling has been
838 * applied to the sock, if so it parses the socket label and returns the
839 * security attributes in @secattr. Returns zero on success, negative values
843 int netlbl_sock_getattr(struct sock *sk,
844 struct netlbl_lsm_secattr *secattr)
848 switch (sk->sk_family) {
850 ret_val = cipso_v4_sock_getattr(sk, secattr);
852 #if IS_ENABLED(CONFIG_IPV6)
858 ret_val = -EPROTONOSUPPORT;
865 * netlbl_conn_setattr - Label a connected socket using the correct protocol
866 * @sk: the socket to label
867 * @addr: the destination address
868 * @secattr: the security attributes
871 * Attach the correct label to the given connected socket using the security
872 * attributes specified in @secattr. The caller is responsible for ensuring
873 * that @sk is locked. Returns zero on success, negative values on failure.
876 int netlbl_conn_setattr(struct sock *sk,
877 struct sockaddr *addr,
878 const struct netlbl_lsm_secattr *secattr)
881 struct sockaddr_in *addr4;
882 struct netlbl_dommap_def *entry;
885 switch (addr->sa_family) {
887 addr4 = (struct sockaddr_in *)addr;
888 entry = netlbl_domhsh_getentry_af4(secattr->domain,
889 addr4->sin_addr.s_addr);
892 goto conn_setattr_return;
894 switch (entry->type) {
895 case NETLBL_NLTYPE_CIPSOV4:
896 ret_val = cipso_v4_sock_setattr(sk,
897 entry->cipso, secattr);
899 case NETLBL_NLTYPE_UNLABELED:
900 /* just delete the protocols we support for right now
901 * but we could remove other protocols if needed */
902 cipso_v4_sock_delattr(sk);
909 #if IS_ENABLED(CONFIG_IPV6)
911 /* since we don't support any IPv6 labeling protocols right
912 * now we can optimize everything away until we do */
917 ret_val = -EPROTONOSUPPORT;
926 * netlbl_req_setattr - Label a request socket using the correct protocol
927 * @req: the request socket to label
928 * @secattr: the security attributes
931 * Attach the correct label to the given socket using the security attributes
932 * specified in @secattr. Returns zero on success, negative values on failure.
935 int netlbl_req_setattr(struct request_sock *req,
936 const struct netlbl_lsm_secattr *secattr)
939 struct netlbl_dommap_def *entry;
942 switch (req->rsk_ops->family) {
944 entry = netlbl_domhsh_getentry_af4(secattr->domain,
945 inet_rsk(req)->ir_rmt_addr);
948 goto req_setattr_return;
950 switch (entry->type) {
951 case NETLBL_NLTYPE_CIPSOV4:
952 ret_val = cipso_v4_req_setattr(req,
953 entry->cipso, secattr);
955 case NETLBL_NLTYPE_UNLABELED:
956 /* just delete the protocols we support for right now
957 * but we could remove other protocols if needed */
958 cipso_v4_req_delattr(req);
965 #if IS_ENABLED(CONFIG_IPV6)
967 /* since we don't support any IPv6 labeling protocols right
968 * now we can optimize everything away until we do */
973 ret_val = -EPROTONOSUPPORT;
982 * netlbl_req_delattr - Delete all the NetLabel labels on a socket
986 * Remove all the NetLabel labeling from @req.
989 void netlbl_req_delattr(struct request_sock *req)
991 cipso_v4_req_delattr(req);
995 * netlbl_skbuff_setattr - Label a packet using the correct protocol
997 * @family: protocol family
998 * @secattr: the security attributes
1001 * Attach the correct label to the given packet using the security attributes
1002 * specified in @secattr. Returns zero on success, negative values on failure.
1005 int netlbl_skbuff_setattr(struct sk_buff *skb,
1007 const struct netlbl_lsm_secattr *secattr)
1011 struct netlbl_dommap_def *entry;
1017 entry = netlbl_domhsh_getentry_af4(secattr->domain,hdr4->daddr);
1018 if (entry == NULL) {
1020 goto skbuff_setattr_return;
1022 switch (entry->type) {
1023 case NETLBL_NLTYPE_CIPSOV4:
1024 ret_val = cipso_v4_skbuff_setattr(skb, entry->cipso,
1027 case NETLBL_NLTYPE_UNLABELED:
1028 /* just delete the protocols we support for right now
1029 * but we could remove other protocols if needed */
1030 ret_val = cipso_v4_skbuff_delattr(skb);
1036 #if IS_ENABLED(CONFIG_IPV6)
1038 /* since we don't support any IPv6 labeling protocols right
1039 * now we can optimize everything away until we do */
1044 ret_val = -EPROTONOSUPPORT;
1047 skbuff_setattr_return:
1053 * netlbl_skbuff_getattr - Determine the security attributes of a packet
1055 * @family: protocol family
1056 * @secattr: the security attributes
1059 * Examines the given packet to see if a recognized form of packet labeling
1060 * is present, if so it parses the packet label and returns the security
1061 * attributes in @secattr. Returns zero on success, negative values on
1065 int netlbl_skbuff_getattr(const struct sk_buff *skb,
1067 struct netlbl_lsm_secattr *secattr)
1071 if (CIPSO_V4_OPTEXIST(skb) &&
1072 cipso_v4_skbuff_getattr(skb, secattr) == 0)
1075 #if IS_ENABLED(CONFIG_IPV6)
1081 return netlbl_unlabel_getattr(skb, family, secattr);
1085 * netlbl_skbuff_err - Handle a LSM error on a sk_buff
1087 * @error: the error code
1088 * @gateway: true if host is acting as a gateway, false otherwise
1091 * Deal with a LSM problem when handling the packet in @skb, typically this is
1092 * a permission denied problem (-EACCES). The correct action is determined
1093 * according to the packet's labeling protocol.
1096 void netlbl_skbuff_err(struct sk_buff *skb, int error, int gateway)
1098 if (CIPSO_V4_OPTEXIST(skb))
1099 cipso_v4_error(skb, error, gateway);
1103 * netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches
1106 * For all of the NetLabel protocols that support some form of label mapping
1107 * cache, invalidate the cache. Returns zero on success, negative values on
1111 void netlbl_cache_invalidate(void)
1113 cipso_v4_cache_invalidate();
1117 * netlbl_cache_add - Add an entry to a NetLabel protocol cache
1119 * @secattr: the packet's security attributes
1122 * Add the LSM security attributes for the given packet to the underlying
1123 * NetLabel protocol's label mapping cache. Returns zero on success, negative
1127 int netlbl_cache_add(const struct sk_buff *skb,
1128 const struct netlbl_lsm_secattr *secattr)
1130 if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0)
1133 if (CIPSO_V4_OPTEXIST(skb))
1134 return cipso_v4_cache_add(skb, secattr);
1140 * Protocol Engine Functions
1144 * netlbl_audit_start - Start an audit message
1145 * @type: audit message type
1146 * @audit_info: NetLabel audit information
1149 * Start an audit message using the type specified in @type and fill the audit
1150 * message with some fields common to all NetLabel audit messages. This
1151 * function should only be used by protocol engines, not LSMs. Returns a
1152 * pointer to the audit buffer on success, NULL on failure.
1155 struct audit_buffer *netlbl_audit_start(int type,
1156 struct netlbl_audit *audit_info)
1158 return netlbl_audit_start_common(type, audit_info);
1166 * netlbl_init - Initialize NetLabel
1169 * Perform the required NetLabel initialization before first use.
1172 static int __init netlbl_init(void)
1176 printk(KERN_INFO "NetLabel: Initializing\n");
1177 printk(KERN_INFO "NetLabel: domain hash size = %u\n",
1178 (1 << NETLBL_DOMHSH_BITSIZE));
1179 printk(KERN_INFO "NetLabel: protocols ="
1184 ret_val = netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE);
1188 ret_val = netlbl_unlabel_init(NETLBL_UNLHSH_BITSIZE);
1192 ret_val = netlbl_netlink_init();
1196 ret_val = netlbl_unlabel_defconf();
1199 printk(KERN_INFO "NetLabel: unlabeled traffic allowed by default\n");
1204 panic("NetLabel: failed to initialize properly (%d)\n", ret_val);
1207 subsys_initcall(netlbl_init);