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;
176 entry->def.addrsel = addrmap;
177 entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
180 goto cfg_unlbl_map_add_failure;
183 ret_val = netlbl_domhsh_add(entry, audit_info);
185 goto cfg_unlbl_map_add_failure;
189 cfg_unlbl_map_add_failure:
190 kfree(entry->domain);
200 * netlbl_cfg_unlbl_static_add - Adds a new static label
201 * @net: network namespace
202 * @dev_name: interface name
203 * @addr: IP address in network byte order (struct in[6]_addr)
204 * @mask: address mask in network byte order (struct in[6]_addr)
205 * @family: address family
206 * @secid: LSM secid value for the entry
207 * @audit_info: NetLabel audit information
210 * Adds a new NetLabel static label to be used when protocol provided labels
211 * are not present on incoming traffic. If @dev_name is NULL then the default
212 * interface will be used. Returns zero on success, negative values on failure.
215 int netlbl_cfg_unlbl_static_add(struct net *net,
216 const char *dev_name,
221 struct netlbl_audit *audit_info)
227 addr_len = sizeof(struct in_addr);
229 #if IS_ENABLED(CONFIG_IPV6)
231 addr_len = sizeof(struct in6_addr);
235 return -EPFNOSUPPORT;
238 return netlbl_unlhsh_add(net,
239 dev_name, addr, mask, addr_len,
244 * netlbl_cfg_unlbl_static_del - Removes an existing static label
245 * @net: network namespace
246 * @dev_name: interface name
247 * @addr: IP address in network byte order (struct in[6]_addr)
248 * @mask: address mask in network byte order (struct in[6]_addr)
249 * @family: address family
250 * @secid: LSM secid value for the entry
251 * @audit_info: NetLabel audit information
254 * Removes an existing NetLabel static label used when protocol provided labels
255 * are not present on incoming traffic. If @dev_name is NULL then the default
256 * interface will be used. Returns zero on success, negative values on failure.
259 int netlbl_cfg_unlbl_static_del(struct net *net,
260 const char *dev_name,
264 struct netlbl_audit *audit_info)
270 addr_len = sizeof(struct in_addr);
272 #if IS_ENABLED(CONFIG_IPV6)
274 addr_len = sizeof(struct in6_addr);
278 return -EPFNOSUPPORT;
281 return netlbl_unlhsh_remove(net,
282 dev_name, addr, mask, addr_len,
287 * netlbl_cfg_cipsov4_add - Add a new CIPSOv4 DOI definition
288 * @doi_def: CIPSO DOI definition
289 * @audit_info: NetLabel audit information
292 * Add a new CIPSO DOI definition as defined by @doi_def. Returns zero on
293 * success and negative values on failure.
296 int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def,
297 struct netlbl_audit *audit_info)
299 return cipso_v4_doi_add(doi_def, audit_info);
303 * netlbl_cfg_cipsov4_del - Remove an existing CIPSOv4 DOI definition
305 * @audit_info: NetLabel audit information
308 * Remove an existing CIPSO DOI definition matching @doi. Returns zero on
309 * success and negative values on failure.
312 void netlbl_cfg_cipsov4_del(u32 doi, struct netlbl_audit *audit_info)
314 cipso_v4_doi_remove(doi, audit_info);
318 * netlbl_cfg_cipsov4_map_add - Add a new CIPSOv4 DOI mapping
319 * @doi: the CIPSO DOI
320 * @domain: the domain mapping to add
322 * @mask: IP address mask
323 * @audit_info: NetLabel audit information
326 * Add a new NetLabel/LSM domain mapping for the given CIPSO DOI to the NetLabel
327 * subsystem. A @domain value of NULL adds a new default domain mapping.
328 * Returns zero on success, negative values on failure.
331 int netlbl_cfg_cipsov4_map_add(u32 doi,
333 const struct in_addr *addr,
334 const struct in_addr *mask,
335 struct netlbl_audit *audit_info)
337 int ret_val = -ENOMEM;
338 struct cipso_v4_doi *doi_def;
339 struct netlbl_dom_map *entry;
340 struct netlbl_domaddr_map *addrmap = NULL;
341 struct netlbl_domaddr4_map *addrinfo = NULL;
343 doi_def = cipso_v4_doi_getdef(doi);
347 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
350 if (domain != NULL) {
351 entry->domain = kstrdup(domain, GFP_ATOMIC);
352 if (entry->domain == NULL)
356 if (addr == NULL && mask == NULL) {
357 entry->def.cipso = doi_def;
358 entry->def.type = NETLBL_NLTYPE_CIPSOV4;
359 } else if (addr != NULL && mask != NULL) {
360 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
363 INIT_LIST_HEAD(&addrmap->list4);
364 INIT_LIST_HEAD(&addrmap->list6);
366 addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC);
367 if (addrinfo == NULL)
369 addrinfo->def.cipso = doi_def;
370 addrinfo->def.type = NETLBL_NLTYPE_CIPSOV4;
371 addrinfo->list.addr = addr->s_addr & mask->s_addr;
372 addrinfo->list.mask = mask->s_addr;
373 addrinfo->list.valid = 1;
374 ret_val = netlbl_af4list_add(&addrinfo->list, &addrmap->list4);
376 goto cfg_cipsov4_map_add_failure;
378 entry->def.addrsel = addrmap;
379 entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
385 ret_val = netlbl_domhsh_add(entry, audit_info);
387 goto cfg_cipsov4_map_add_failure;
391 cfg_cipsov4_map_add_failure:
396 kfree(entry->domain);
400 cipso_v4_doi_putdef(doi_def);
405 * Security Attribute Functions
408 #define _CM_F_NONE 0x00000000
409 #define _CM_F_ALLOC 0x00000001
410 #define _CM_F_WALK 0x00000002
413 * _netlbl_secattr_catmap_getnode - Get a individual node from a catmap
414 * @catmap: pointer to the category bitmap
415 * @offset: the requested offset
416 * @cm_flags: catmap flags, see _CM_F_*
417 * @gfp_flags: memory allocation flags
420 * Iterate through the catmap looking for the node associated with @offset.
421 * If the _CM_F_ALLOC flag is set in @cm_flags and there is no associated node,
422 * one will be created and inserted into the catmap. If the _CM_F_WALK flag is
423 * set in @cm_flags and there is no associated node, the next highest node will
424 * be returned. Returns a pointer to the node on success, NULL on failure.
427 static struct netlbl_lsm_secattr_catmap *_netlbl_secattr_catmap_getnode(
428 struct netlbl_lsm_secattr_catmap **catmap,
430 unsigned int cm_flags,
433 struct netlbl_lsm_secattr_catmap *iter = *catmap;
434 struct netlbl_lsm_secattr_catmap *prev = NULL;
437 goto secattr_catmap_getnode_alloc;
438 if (offset < iter->startbit)
439 goto secattr_catmap_getnode_walk;
440 while (iter && offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
444 if (iter == NULL || offset < iter->startbit)
445 goto secattr_catmap_getnode_walk;
449 secattr_catmap_getnode_walk:
450 if (cm_flags & _CM_F_WALK)
452 secattr_catmap_getnode_alloc:
453 if (!(cm_flags & _CM_F_ALLOC))
456 iter = netlbl_secattr_catmap_alloc(gfp_flags);
459 iter->startbit = offset & ~(NETLBL_CATMAP_SIZE - 1);
462 iter->next = *catmap;
465 iter->next = prev->next;
473 * netlbl_secattr_catmap_walk - Walk a LSM secattr catmap looking for a bit
474 * @catmap: the category bitmap
475 * @offset: the offset to start searching at, in bits
478 * This function walks a LSM secattr category bitmap starting at @offset and
479 * returns the spot of the first set bit or -ENOENT if no bits are set.
482 int netlbl_secattr_catmap_walk(struct netlbl_lsm_secattr_catmap *catmap,
485 struct netlbl_lsm_secattr_catmap *iter = catmap;
488 NETLBL_CATMAP_MAPTYPE bitmap;
490 iter = _netlbl_secattr_catmap_getnode(&catmap, offset, _CM_F_WALK, 0);
493 if (offset > iter->startbit) {
494 offset -= iter->startbit;
495 idx = offset / NETLBL_CATMAP_MAPSIZE;
496 bit = offset % NETLBL_CATMAP_MAPSIZE;
501 bitmap = iter->bitmap[idx] >> bit;
505 while ((bitmap & NETLBL_CATMAP_BIT) == 0) {
509 return iter->startbit +
510 (NETLBL_CATMAP_MAPSIZE * idx) + bit;
512 if (++idx >= NETLBL_CATMAP_MAPCNT) {
513 if (iter->next != NULL) {
519 bitmap = iter->bitmap[idx];
527 * netlbl_secattr_catmap_walk_rng - Find the end of a string of set bits
528 * @catmap: the category bitmap
529 * @offset: the offset to start searching at, in bits
532 * This function walks a LSM secattr category bitmap starting at @offset and
533 * returns the spot of the first cleared bit or -ENOENT if the offset is past
534 * the end of the bitmap.
537 int netlbl_secattr_catmap_walk_rng(struct netlbl_lsm_secattr_catmap *catmap,
540 struct netlbl_lsm_secattr_catmap *iter;
541 struct netlbl_lsm_secattr_catmap *prev = NULL;
544 NETLBL_CATMAP_MAPTYPE bitmask;
545 NETLBL_CATMAP_MAPTYPE bitmap;
547 iter = _netlbl_secattr_catmap_getnode(&catmap, offset, _CM_F_WALK, 0);
550 if (offset > iter->startbit) {
551 offset -= iter->startbit;
552 idx = offset / NETLBL_CATMAP_MAPSIZE;
553 bit = offset % NETLBL_CATMAP_MAPSIZE;
558 bitmask = NETLBL_CATMAP_BIT << bit;
561 bitmap = iter->bitmap[idx];
562 while (bitmask != 0 && (bitmap & bitmask) != 0) {
567 if (prev && idx == 0 && bit == 0)
568 return prev->startbit + NETLBL_CATMAP_SIZE - 1;
569 else if (bitmask != 0)
570 return iter->startbit +
571 (NETLBL_CATMAP_MAPSIZE * idx) + bit - 1;
572 else if (++idx >= NETLBL_CATMAP_MAPCNT) {
573 if (iter->next == NULL)
574 return iter->startbit + NETLBL_CATMAP_SIZE - 1;
579 bitmask = NETLBL_CATMAP_BIT;
587 * netlbl_secattr_catmap_getlong - Export an unsigned long bitmap
588 * @catmap: pointer to the category bitmap
589 * @offset: pointer to the requested offset
590 * @bitmap: the exported bitmap
593 * Export a bitmap with an offset greater than or equal to @offset and return
594 * it in @bitmap. The @offset must be aligned to an unsigned long and will be
595 * updated on return if different from what was requested; if the catmap is
596 * empty at the requested offset and beyond, the @offset is set to (u32)-1.
597 * Returns zero on sucess, negative values on failure.
600 int netlbl_secattr_catmap_getlong(struct netlbl_lsm_secattr_catmap *catmap,
602 unsigned long *bitmap)
604 struct netlbl_lsm_secattr_catmap *iter;
608 /* only allow aligned offsets */
609 if ((off & (BITS_PER_LONG - 1)) != 0)
612 if (off < catmap->startbit) {
613 off = catmap->startbit;
616 iter = _netlbl_secattr_catmap_getnode(&catmap, off, _CM_F_NONE, 0);
622 if (off < iter->startbit) {
623 off = iter->startbit;
626 off -= iter->startbit;
628 idx = off / NETLBL_CATMAP_MAPSIZE;
629 *bitmap = iter->bitmap[idx] >> (off % NETLBL_CATMAP_SIZE);
635 * netlbl_secattr_catmap_setbit - Set a bit in a LSM secattr catmap
636 * @catmap: pointer to the category bitmap
637 * @bit: the bit to set
638 * @flags: memory allocation flags
641 * Set the bit specified by @bit in @catmap. Returns zero on success,
642 * negative values on failure.
645 int netlbl_secattr_catmap_setbit(struct netlbl_lsm_secattr_catmap **catmap,
649 struct netlbl_lsm_secattr_catmap *iter;
652 iter = _netlbl_secattr_catmap_getnode(catmap, bit, _CM_F_ALLOC, flags);
656 bit -= iter->startbit;
657 idx = bit / NETLBL_CATMAP_MAPSIZE;
658 iter->bitmap[idx] |= NETLBL_CATMAP_BIT << (bit % NETLBL_CATMAP_MAPSIZE);
664 * netlbl_secattr_catmap_setrng - Set a range of bits in a LSM secattr catmap
665 * @catmap: pointer to the category bitmap
666 * @start: the starting bit
667 * @end: the last bit in the string
668 * @flags: memory allocation flags
671 * Set a range of bits, starting at @start and ending with @end. Returns zero
672 * on success, negative values on failure.
675 int netlbl_secattr_catmap_setrng(struct netlbl_lsm_secattr_catmap **catmap,
683 while (rc == 0 && spot <= end) {
684 if (((spot & (BITS_PER_LONG - 1)) != 0) &&
685 ((end - spot) > BITS_PER_LONG)) {
686 rc = netlbl_secattr_catmap_setlong(catmap,
690 spot += BITS_PER_LONG;
692 rc = netlbl_secattr_catmap_setbit(catmap,
701 * netlbl_secattr_catmap_setlong - Import an unsigned long bitmap
702 * @catmap: pointer to the category bitmap
703 * @offset: offset to the start of the imported bitmap
704 * @bitmap: the bitmap to import
705 * @flags: memory allocation flags
708 * Import the bitmap specified in @bitmap into @catmap, using the offset
709 * in @offset. The offset must be aligned to an unsigned long. Returns zero
710 * on success, negative values on failure.
713 int netlbl_secattr_catmap_setlong(struct netlbl_lsm_secattr_catmap **catmap,
715 unsigned long bitmap,
718 struct netlbl_lsm_secattr_catmap *iter;
721 /* only allow aligned offsets */
722 if ((offset & (BITS_PER_LONG - 1)) != 0)
725 iter = _netlbl_secattr_catmap_getnode(catmap,
726 offset, _CM_F_ALLOC, flags);
730 offset -= iter->startbit;
731 idx = offset / NETLBL_CATMAP_MAPSIZE;
732 iter->bitmap[idx] |= bitmap << (offset % NETLBL_CATMAP_MAPSIZE);
742 * netlbl_enabled - Determine if the NetLabel subsystem is enabled
745 * The LSM can use this function to determine if it should use NetLabel
746 * security attributes in it's enforcement mechanism. Currently, NetLabel is
747 * considered to be enabled when it's configuration contains a valid setup for
748 * at least one labeled protocol (i.e. NetLabel can understand incoming
749 * labeled packets of at least one type); otherwise NetLabel is considered to
753 int netlbl_enabled(void)
755 /* At some point we probably want to expose this mechanism to the user
756 * as well so that admins can toggle NetLabel regardless of the
758 return (atomic_read(&netlabel_mgmt_protocount) > 0);
762 * netlbl_sock_setattr - Label a socket using the correct protocol
763 * @sk: the socket to label
764 * @family: protocol family
765 * @secattr: the security attributes
768 * Attach the correct label to the given socket using the security attributes
769 * specified in @secattr. This function requires exclusive access to @sk,
770 * which means it either needs to be in the process of being created or locked.
771 * Returns zero on success, -EDESTADDRREQ if the domain is configured to use
772 * network address selectors (can't blindly label the socket), and negative
773 * values on all other failures.
776 int netlbl_sock_setattr(struct sock *sk,
778 const struct netlbl_lsm_secattr *secattr)
781 struct netlbl_dom_map *dom_entry;
784 dom_entry = netlbl_domhsh_getentry(secattr->domain);
785 if (dom_entry == NULL) {
787 goto socket_setattr_return;
791 switch (dom_entry->def.type) {
792 case NETLBL_NLTYPE_ADDRSELECT:
793 ret_val = -EDESTADDRREQ;
795 case NETLBL_NLTYPE_CIPSOV4:
796 ret_val = cipso_v4_sock_setattr(sk,
797 dom_entry->def.cipso,
800 case NETLBL_NLTYPE_UNLABELED:
807 #if IS_ENABLED(CONFIG_IPV6)
809 /* since we don't support any IPv6 labeling protocols right
810 * now we can optimize everything away until we do */
815 ret_val = -EPROTONOSUPPORT;
818 socket_setattr_return:
824 * netlbl_sock_delattr - Delete all the NetLabel labels on a socket
828 * Remove all the NetLabel labeling from @sk. The caller is responsible for
829 * ensuring that @sk is locked.
832 void netlbl_sock_delattr(struct sock *sk)
834 cipso_v4_sock_delattr(sk);
838 * netlbl_sock_getattr - Determine the security attributes of a sock
840 * @secattr: the security attributes
843 * Examines the given sock to see if any NetLabel style labeling has been
844 * applied to the sock, if so it parses the socket label and returns the
845 * security attributes in @secattr. Returns zero on success, negative values
849 int netlbl_sock_getattr(struct sock *sk,
850 struct netlbl_lsm_secattr *secattr)
854 switch (sk->sk_family) {
856 ret_val = cipso_v4_sock_getattr(sk, secattr);
858 #if IS_ENABLED(CONFIG_IPV6)
864 ret_val = -EPROTONOSUPPORT;
871 * netlbl_conn_setattr - Label a connected socket using the correct protocol
872 * @sk: the socket to label
873 * @addr: the destination address
874 * @secattr: the security attributes
877 * Attach the correct label to the given connected socket using the security
878 * attributes specified in @secattr. The caller is responsible for ensuring
879 * that @sk is locked. Returns zero on success, negative values on failure.
882 int netlbl_conn_setattr(struct sock *sk,
883 struct sockaddr *addr,
884 const struct netlbl_lsm_secattr *secattr)
887 struct sockaddr_in *addr4;
888 struct netlbl_dommap_def *entry;
891 switch (addr->sa_family) {
893 addr4 = (struct sockaddr_in *)addr;
894 entry = netlbl_domhsh_getentry_af4(secattr->domain,
895 addr4->sin_addr.s_addr);
898 goto conn_setattr_return;
900 switch (entry->type) {
901 case NETLBL_NLTYPE_CIPSOV4:
902 ret_val = cipso_v4_sock_setattr(sk,
903 entry->cipso, secattr);
905 case NETLBL_NLTYPE_UNLABELED:
906 /* just delete the protocols we support for right now
907 * but we could remove other protocols if needed */
908 cipso_v4_sock_delattr(sk);
915 #if IS_ENABLED(CONFIG_IPV6)
917 /* since we don't support any IPv6 labeling protocols right
918 * now we can optimize everything away until we do */
923 ret_val = -EPROTONOSUPPORT;
932 * netlbl_req_setattr - Label a request socket using the correct protocol
933 * @req: the request socket to label
934 * @secattr: the security attributes
937 * Attach the correct label to the given socket using the security attributes
938 * specified in @secattr. Returns zero on success, negative values on failure.
941 int netlbl_req_setattr(struct request_sock *req,
942 const struct netlbl_lsm_secattr *secattr)
945 struct netlbl_dommap_def *entry;
948 switch (req->rsk_ops->family) {
950 entry = netlbl_domhsh_getentry_af4(secattr->domain,
951 inet_rsk(req)->ir_rmt_addr);
954 goto req_setattr_return;
956 switch (entry->type) {
957 case NETLBL_NLTYPE_CIPSOV4:
958 ret_val = cipso_v4_req_setattr(req,
959 entry->cipso, secattr);
961 case NETLBL_NLTYPE_UNLABELED:
962 /* just delete the protocols we support for right now
963 * but we could remove other protocols if needed */
964 cipso_v4_req_delattr(req);
971 #if IS_ENABLED(CONFIG_IPV6)
973 /* since we don't support any IPv6 labeling protocols right
974 * now we can optimize everything away until we do */
979 ret_val = -EPROTONOSUPPORT;
988 * netlbl_req_delattr - Delete all the NetLabel labels on a socket
992 * Remove all the NetLabel labeling from @req.
995 void netlbl_req_delattr(struct request_sock *req)
997 cipso_v4_req_delattr(req);
1001 * netlbl_skbuff_setattr - Label a packet using the correct protocol
1003 * @family: protocol family
1004 * @secattr: the security attributes
1007 * Attach the correct label to the given packet using the security attributes
1008 * specified in @secattr. Returns zero on success, negative values on failure.
1011 int netlbl_skbuff_setattr(struct sk_buff *skb,
1013 const struct netlbl_lsm_secattr *secattr)
1017 struct netlbl_dommap_def *entry;
1023 entry = netlbl_domhsh_getentry_af4(secattr->domain,hdr4->daddr);
1024 if (entry == NULL) {
1026 goto skbuff_setattr_return;
1028 switch (entry->type) {
1029 case NETLBL_NLTYPE_CIPSOV4:
1030 ret_val = cipso_v4_skbuff_setattr(skb, entry->cipso,
1033 case NETLBL_NLTYPE_UNLABELED:
1034 /* just delete the protocols we support for right now
1035 * but we could remove other protocols if needed */
1036 ret_val = cipso_v4_skbuff_delattr(skb);
1042 #if IS_ENABLED(CONFIG_IPV6)
1044 /* since we don't support any IPv6 labeling protocols right
1045 * now we can optimize everything away until we do */
1050 ret_val = -EPROTONOSUPPORT;
1053 skbuff_setattr_return:
1059 * netlbl_skbuff_getattr - Determine the security attributes of a packet
1061 * @family: protocol family
1062 * @secattr: the security attributes
1065 * Examines the given packet to see if a recognized form of packet labeling
1066 * is present, if so it parses the packet label and returns the security
1067 * attributes in @secattr. Returns zero on success, negative values on
1071 int netlbl_skbuff_getattr(const struct sk_buff *skb,
1073 struct netlbl_lsm_secattr *secattr)
1077 if (CIPSO_V4_OPTEXIST(skb) &&
1078 cipso_v4_skbuff_getattr(skb, secattr) == 0)
1081 #if IS_ENABLED(CONFIG_IPV6)
1087 return netlbl_unlabel_getattr(skb, family, secattr);
1091 * netlbl_skbuff_err - Handle a LSM error on a sk_buff
1093 * @error: the error code
1094 * @gateway: true if host is acting as a gateway, false otherwise
1097 * Deal with a LSM problem when handling the packet in @skb, typically this is
1098 * a permission denied problem (-EACCES). The correct action is determined
1099 * according to the packet's labeling protocol.
1102 void netlbl_skbuff_err(struct sk_buff *skb, int error, int gateway)
1104 if (CIPSO_V4_OPTEXIST(skb))
1105 cipso_v4_error(skb, error, gateway);
1109 * netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches
1112 * For all of the NetLabel protocols that support some form of label mapping
1113 * cache, invalidate the cache. Returns zero on success, negative values on
1117 void netlbl_cache_invalidate(void)
1119 cipso_v4_cache_invalidate();
1123 * netlbl_cache_add - Add an entry to a NetLabel protocol cache
1125 * @secattr: the packet's security attributes
1128 * Add the LSM security attributes for the given packet to the underlying
1129 * NetLabel protocol's label mapping cache. Returns zero on success, negative
1133 int netlbl_cache_add(const struct sk_buff *skb,
1134 const struct netlbl_lsm_secattr *secattr)
1136 if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0)
1139 if (CIPSO_V4_OPTEXIST(skb))
1140 return cipso_v4_cache_add(skb, secattr);
1146 * Protocol Engine Functions
1150 * netlbl_audit_start - Start an audit message
1151 * @type: audit message type
1152 * @audit_info: NetLabel audit information
1155 * Start an audit message using the type specified in @type and fill the audit
1156 * message with some fields common to all NetLabel audit messages. This
1157 * function should only be used by protocol engines, not LSMs. Returns a
1158 * pointer to the audit buffer on success, NULL on failure.
1161 struct audit_buffer *netlbl_audit_start(int type,
1162 struct netlbl_audit *audit_info)
1164 return netlbl_audit_start_common(type, audit_info);
1172 * netlbl_init - Initialize NetLabel
1175 * Perform the required NetLabel initialization before first use.
1178 static int __init netlbl_init(void)
1182 printk(KERN_INFO "NetLabel: Initializing\n");
1183 printk(KERN_INFO "NetLabel: domain hash size = %u\n",
1184 (1 << NETLBL_DOMHSH_BITSIZE));
1185 printk(KERN_INFO "NetLabel: protocols ="
1190 ret_val = netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE);
1194 ret_val = netlbl_unlabel_init(NETLBL_UNLHSH_BITSIZE);
1198 ret_val = netlbl_netlink_init();
1202 ret_val = netlbl_unlabel_defconf();
1205 printk(KERN_INFO "NetLabel: unlabeled traffic allowed by default\n");
1210 panic("NetLabel: failed to initialize properly (%d)\n", ret_val);
1213 subsys_initcall(netlbl_init);