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, write to the Free Software
27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
31 #include <linux/init.h>
32 #include <linux/types.h>
33 #include <linux/slab.h>
34 #include <linux/audit.h>
36 #include <linux/in6.h>
39 #include <net/netlabel.h>
40 #include <net/cipso_ipv4.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_user.h"
48 #include "netlabel_mgmt.h"
49 #include "netlabel_addrlist.h"
52 * Configuration Functions
56 * netlbl_cfg_map_del - Remove a NetLabel/LSM domain mapping
57 * @domain: the domain mapping to remove
58 * @family: address family
60 * @mask: IP address mask
61 * @audit_info: NetLabel audit information
64 * Removes a NetLabel/LSM domain mapping. A @domain value of NULL causes the
65 * default domain mapping to be removed. Returns zero on success, negative
69 int netlbl_cfg_map_del(const char *domain,
73 struct netlbl_audit *audit_info)
75 if (addr == NULL && mask == NULL) {
76 return netlbl_domhsh_remove(domain, audit_info);
77 } else if (addr != NULL && mask != NULL) {
80 return netlbl_domhsh_remove_af4(domain, addr, mask,
90 * netlbl_cfg_unlbl_map_add - Add a new unlabeled mapping
91 * @domain: the domain mapping to add
92 * @family: address family
94 * @mask: IP address mask
95 * @audit_info: NetLabel audit information
98 * Adds a new unlabeled NetLabel/LSM domain mapping. A @domain value of NULL
99 * causes a new default domain mapping to be added. Returns zero on success,
100 * negative values on failure.
103 int netlbl_cfg_unlbl_map_add(const char *domain,
107 struct netlbl_audit *audit_info)
109 int ret_val = -ENOMEM;
110 struct netlbl_dom_map *entry;
111 struct netlbl_domaddr_map *addrmap = NULL;
112 struct netlbl_domaddr4_map *map4 = NULL;
113 struct netlbl_domaddr6_map *map6 = NULL;
114 const struct in_addr *addr4, *mask4;
115 const struct in6_addr *addr6, *mask6;
117 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
120 if (domain != NULL) {
121 entry->domain = kstrdup(domain, GFP_ATOMIC);
122 if (entry->domain == NULL)
123 goto cfg_unlbl_map_add_failure;
126 if (addr == NULL && mask == NULL)
127 entry->type = NETLBL_NLTYPE_UNLABELED;
128 else if (addr != NULL && mask != NULL) {
129 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
131 goto cfg_unlbl_map_add_failure;
132 INIT_LIST_HEAD(&addrmap->list4);
133 INIT_LIST_HEAD(&addrmap->list6);
139 map4 = kzalloc(sizeof(*map4), GFP_ATOMIC);
141 goto cfg_unlbl_map_add_failure;
142 map4->type = NETLBL_NLTYPE_UNLABELED;
143 map4->list.addr = addr4->s_addr & mask4->s_addr;
144 map4->list.mask = mask4->s_addr;
145 map4->list.valid = 1;
146 ret_val = netlbl_af4list_add(&map4->list,
149 goto cfg_unlbl_map_add_failure;
154 map6 = kzalloc(sizeof(*map6), GFP_ATOMIC);
156 goto cfg_unlbl_map_add_failure;
157 map6->type = NETLBL_NLTYPE_UNLABELED;
158 ipv6_addr_copy(&map6->list.addr, addr6);
159 map6->list.addr.s6_addr32[0] &= mask6->s6_addr32[0];
160 map6->list.addr.s6_addr32[1] &= mask6->s6_addr32[1];
161 map6->list.addr.s6_addr32[2] &= mask6->s6_addr32[2];
162 map6->list.addr.s6_addr32[3] &= mask6->s6_addr32[3];
163 ipv6_addr_copy(&map6->list.mask, mask6);
164 map6->list.valid = 1;
165 ret_val = netlbl_af4list_add(&map4->list,
168 goto cfg_unlbl_map_add_failure;
171 goto cfg_unlbl_map_add_failure;
175 entry->type_def.addrsel = addrmap;
176 entry->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);
229 addr_len = sizeof(struct in6_addr);
232 return -EPFNOSUPPORT;
235 return netlbl_unlhsh_add(net,
236 dev_name, addr, mask, addr_len,
241 * netlbl_cfg_unlbl_static_del - Removes an existing static label
242 * @net: network namespace
243 * @dev_name: interface name
244 * @addr: IP address in network byte order (struct in[6]_addr)
245 * @mask: address mask in network byte order (struct in[6]_addr)
246 * @family: address family
247 * @secid: LSM secid value for the entry
248 * @audit_info: NetLabel audit information
251 * Removes an existing NetLabel static label used when protocol provided labels
252 * are not present on incoming traffic. If @dev_name is NULL then the default
253 * interface will be used. Returns zero on success, negative values on failure.
256 int netlbl_cfg_unlbl_static_del(struct net *net,
257 const char *dev_name,
261 struct netlbl_audit *audit_info)
267 addr_len = sizeof(struct in_addr);
270 addr_len = sizeof(struct in6_addr);
273 return -EPFNOSUPPORT;
276 return netlbl_unlhsh_remove(net,
277 dev_name, addr, mask, addr_len,
282 * netlbl_cfg_cipsov4_add - Add a new CIPSOv4 DOI definition
283 * @doi_def: CIPSO DOI definition
284 * @audit_info: NetLabel audit information
287 * Add a new CIPSO DOI definition as defined by @doi_def. Returns zero on
288 * success and negative values on failure.
291 int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def,
292 struct netlbl_audit *audit_info)
294 return cipso_v4_doi_add(doi_def, audit_info);
298 * netlbl_cfg_cipsov4_del - Remove an existing CIPSOv4 DOI definition
300 * @audit_info: NetLabel audit information
303 * Remove an existing CIPSO DOI definition matching @doi. Returns zero on
304 * success and negative values on failure.
307 void netlbl_cfg_cipsov4_del(u32 doi, struct netlbl_audit *audit_info)
309 cipso_v4_doi_remove(doi, audit_info);
313 * netlbl_cfg_cipsov4_map_add - Add a new CIPSOv4 DOI mapping
314 * @doi: the CIPSO DOI
315 * @domain: the domain mapping to add
317 * @mask: IP address mask
318 * @audit_info: NetLabel audit information
321 * Add a new NetLabel/LSM domain mapping for the given CIPSO DOI to the NetLabel
322 * subsystem. A @domain value of NULL adds a new default domain mapping.
323 * Returns zero on success, negative values on failure.
326 int netlbl_cfg_cipsov4_map_add(u32 doi,
328 const struct in_addr *addr,
329 const struct in_addr *mask,
330 struct netlbl_audit *audit_info)
332 int ret_val = -ENOMEM;
333 struct cipso_v4_doi *doi_def;
334 struct netlbl_dom_map *entry;
335 struct netlbl_domaddr_map *addrmap = NULL;
336 struct netlbl_domaddr4_map *addrinfo = NULL;
338 doi_def = cipso_v4_doi_getdef(doi);
342 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
345 if (domain != NULL) {
346 entry->domain = kstrdup(domain, GFP_ATOMIC);
347 if (entry->domain == NULL)
351 if (addr == NULL && mask == NULL) {
352 entry->type_def.cipsov4 = doi_def;
353 entry->type = NETLBL_NLTYPE_CIPSOV4;
354 } else if (addr != NULL && mask != NULL) {
355 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
358 INIT_LIST_HEAD(&addrmap->list4);
359 INIT_LIST_HEAD(&addrmap->list6);
361 addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC);
362 if (addrinfo == NULL)
364 addrinfo->type_def.cipsov4 = doi_def;
365 addrinfo->type = NETLBL_NLTYPE_CIPSOV4;
366 addrinfo->list.addr = addr->s_addr & mask->s_addr;
367 addrinfo->list.mask = mask->s_addr;
368 addrinfo->list.valid = 1;
369 ret_val = netlbl_af4list_add(&addrinfo->list, &addrmap->list4);
371 goto cfg_cipsov4_map_add_failure;
373 entry->type_def.addrsel = addrmap;
374 entry->type = NETLBL_NLTYPE_ADDRSELECT;
380 ret_val = netlbl_domhsh_add(entry, audit_info);
382 goto cfg_cipsov4_map_add_failure;
386 cfg_cipsov4_map_add_failure:
391 kfree(entry->domain);
395 cipso_v4_doi_putdef(doi_def);
400 * Security Attribute Functions
404 * netlbl_secattr_catmap_walk - Walk a LSM secattr catmap looking for a bit
405 * @catmap: the category bitmap
406 * @offset: the offset to start searching at, in bits
409 * This function walks a LSM secattr category bitmap starting at @offset and
410 * returns the spot of the first set bit or -ENOENT if no bits are set.
413 int netlbl_secattr_catmap_walk(struct netlbl_lsm_secattr_catmap *catmap,
416 struct netlbl_lsm_secattr_catmap *iter = catmap;
419 NETLBL_CATMAP_MAPTYPE bitmap;
421 if (offset > iter->startbit) {
422 while (offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
427 node_idx = (offset - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
428 node_bit = offset - iter->startbit -
429 (NETLBL_CATMAP_MAPSIZE * node_idx);
434 bitmap = iter->bitmap[node_idx] >> node_bit;
438 while ((bitmap & NETLBL_CATMAP_BIT) == 0) {
442 return iter->startbit +
443 (NETLBL_CATMAP_MAPSIZE * node_idx) + node_bit;
445 if (++node_idx >= NETLBL_CATMAP_MAPCNT) {
446 if (iter->next != NULL) {
452 bitmap = iter->bitmap[node_idx];
460 * netlbl_secattr_catmap_walk_rng - Find the end of a string of set bits
461 * @catmap: the category bitmap
462 * @offset: the offset to start searching at, in bits
465 * This function walks a LSM secattr category bitmap starting at @offset and
466 * returns the spot of the first cleared bit or -ENOENT if the offset is past
467 * the end of the bitmap.
470 int netlbl_secattr_catmap_walk_rng(struct netlbl_lsm_secattr_catmap *catmap,
473 struct netlbl_lsm_secattr_catmap *iter = catmap;
476 NETLBL_CATMAP_MAPTYPE bitmask;
477 NETLBL_CATMAP_MAPTYPE bitmap;
479 if (offset > iter->startbit) {
480 while (offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
485 node_idx = (offset - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
486 node_bit = offset - iter->startbit -
487 (NETLBL_CATMAP_MAPSIZE * node_idx);
492 bitmask = NETLBL_CATMAP_BIT << node_bit;
495 bitmap = iter->bitmap[node_idx];
496 while (bitmask != 0 && (bitmap & bitmask) != 0) {
502 return iter->startbit +
503 (NETLBL_CATMAP_MAPSIZE * node_idx) +
505 else if (++node_idx >= NETLBL_CATMAP_MAPCNT) {
506 if (iter->next == NULL)
507 return iter->startbit + NETLBL_CATMAP_SIZE - 1;
511 bitmask = NETLBL_CATMAP_BIT;
519 * netlbl_secattr_catmap_setbit - Set a bit in a LSM secattr catmap
520 * @catmap: the category bitmap
521 * @bit: the bit to set
522 * @flags: memory allocation flags
525 * Set the bit specified by @bit in @catmap. Returns zero on success,
526 * negative values on failure.
529 int netlbl_secattr_catmap_setbit(struct netlbl_lsm_secattr_catmap *catmap,
533 struct netlbl_lsm_secattr_catmap *iter = catmap;
537 while (iter->next != NULL &&
538 bit >= (iter->startbit + NETLBL_CATMAP_SIZE))
540 if (bit >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
541 iter->next = netlbl_secattr_catmap_alloc(flags);
542 if (iter->next == NULL)
545 iter->startbit = bit & ~(NETLBL_CATMAP_SIZE - 1);
548 /* gcc always rounds to zero when doing integer division */
549 node_idx = (bit - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
550 node_bit = bit - iter->startbit - (NETLBL_CATMAP_MAPSIZE * node_idx);
551 iter->bitmap[node_idx] |= NETLBL_CATMAP_BIT << node_bit;
557 * netlbl_secattr_catmap_setrng - Set a range of bits in a LSM secattr catmap
558 * @catmap: the category bitmap
559 * @start: the starting bit
560 * @end: the last bit in the string
561 * @flags: memory allocation flags
564 * Set a range of bits, starting at @start and ending with @end. Returns zero
565 * on success, negative values on failure.
568 int netlbl_secattr_catmap_setrng(struct netlbl_lsm_secattr_catmap *catmap,
574 struct netlbl_lsm_secattr_catmap *iter = catmap;
578 /* XXX - This could probably be made a bit faster by combining writes
579 * to the catmap instead of setting a single bit each time, but for
580 * right now skipping to the start of the range in the catmap should
581 * be a nice improvement over calling the individual setbit function
582 * repeatedly from a loop. */
584 while (iter->next != NULL &&
585 start >= (iter->startbit + NETLBL_CATMAP_SIZE))
587 iter_max_spot = iter->startbit + NETLBL_CATMAP_SIZE;
589 for (spot = start; spot <= end && ret_val == 0; spot++) {
590 if (spot >= iter_max_spot && iter->next != NULL) {
592 iter_max_spot = iter->startbit + NETLBL_CATMAP_SIZE;
594 ret_val = netlbl_secattr_catmap_setbit(iter, spot, GFP_ATOMIC);
605 * netlbl_enabled - Determine if the NetLabel subsystem is enabled
608 * The LSM can use this function to determine if it should use NetLabel
609 * security attributes in it's enforcement mechanism. Currently, NetLabel is
610 * considered to be enabled when it's configuration contains a valid setup for
611 * at least one labeled protocol (i.e. NetLabel can understand incoming
612 * labeled packets of at least one type); otherwise NetLabel is considered to
616 int netlbl_enabled(void)
618 /* At some point we probably want to expose this mechanism to the user
619 * as well so that admins can toggle NetLabel regardless of the
621 return (atomic_read(&netlabel_mgmt_protocount) > 0);
625 * netlbl_sock_setattr - Label a socket using the correct protocol
626 * @sk: the socket to label
627 * @family: protocol family
628 * @secattr: the security attributes
631 * Attach the correct label to the given socket using the security attributes
632 * specified in @secattr. This function requires exclusive access to @sk,
633 * which means it either needs to be in the process of being created or locked.
634 * Returns zero on success, -EDESTADDRREQ if the domain is configured to use
635 * network address selectors (can't blindly label the socket), and negative
636 * values on all other failures.
639 int netlbl_sock_setattr(struct sock *sk,
641 const struct netlbl_lsm_secattr *secattr)
644 struct netlbl_dom_map *dom_entry;
647 dom_entry = netlbl_domhsh_getentry(secattr->domain);
648 if (dom_entry == NULL) {
650 goto socket_setattr_return;
654 switch (dom_entry->type) {
655 case NETLBL_NLTYPE_ADDRSELECT:
656 ret_val = -EDESTADDRREQ;
658 case NETLBL_NLTYPE_CIPSOV4:
659 ret_val = cipso_v4_sock_setattr(sk,
660 dom_entry->type_def.cipsov4,
663 case NETLBL_NLTYPE_UNLABELED:
670 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
672 /* since we don't support any IPv6 labeling protocols right
673 * now we can optimize everything away until we do */
678 ret_val = -EPROTONOSUPPORT;
681 socket_setattr_return:
687 * netlbl_sock_delattr - Delete all the NetLabel labels on a socket
691 * Remove all the NetLabel labeling from @sk. The caller is responsible for
692 * ensuring that @sk is locked.
695 void netlbl_sock_delattr(struct sock *sk)
697 cipso_v4_sock_delattr(sk);
701 * netlbl_sock_getattr - Determine the security attributes of a sock
703 * @secattr: the security attributes
706 * Examines the given sock to see if any NetLabel style labeling has been
707 * applied to the sock, if so it parses the socket label and returns the
708 * security attributes in @secattr. Returns zero on success, negative values
712 int netlbl_sock_getattr(struct sock *sk,
713 struct netlbl_lsm_secattr *secattr)
717 switch (sk->sk_family) {
719 ret_val = cipso_v4_sock_getattr(sk, secattr);
721 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
727 ret_val = -EPROTONOSUPPORT;
734 * netlbl_conn_setattr - Label a connected socket using the correct protocol
735 * @sk: the socket to label
736 * @addr: the destination address
737 * @secattr: the security attributes
740 * Attach the correct label to the given connected socket using the security
741 * attributes specified in @secattr. The caller is responsible for ensuring
742 * that @sk is locked. Returns zero on success, negative values on failure.
745 int netlbl_conn_setattr(struct sock *sk,
746 struct sockaddr *addr,
747 const struct netlbl_lsm_secattr *secattr)
750 struct sockaddr_in *addr4;
751 struct netlbl_domaddr4_map *af4_entry;
754 switch (addr->sa_family) {
756 addr4 = (struct sockaddr_in *)addr;
757 af4_entry = netlbl_domhsh_getentry_af4(secattr->domain,
758 addr4->sin_addr.s_addr);
759 if (af4_entry == NULL) {
761 goto conn_setattr_return;
763 switch (af4_entry->type) {
764 case NETLBL_NLTYPE_CIPSOV4:
765 ret_val = cipso_v4_sock_setattr(sk,
766 af4_entry->type_def.cipsov4,
769 case NETLBL_NLTYPE_UNLABELED:
770 /* just delete the protocols we support for right now
771 * but we could remove other protocols if needed */
772 cipso_v4_sock_delattr(sk);
779 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
781 /* since we don't support any IPv6 labeling protocols right
782 * now we can optimize everything away until we do */
787 ret_val = -EPROTONOSUPPORT;
796 * netlbl_req_setattr - Label a request socket using the correct protocol
797 * @req: the request socket to label
798 * @secattr: the security attributes
801 * Attach the correct label to the given socket using the security attributes
802 * specified in @secattr. Returns zero on success, negative values on failure.
805 int netlbl_req_setattr(struct request_sock *req,
806 const struct netlbl_lsm_secattr *secattr)
809 struct netlbl_dom_map *dom_entry;
810 struct netlbl_domaddr4_map *af4_entry;
812 struct cipso_v4_doi *proto_cv4;
815 dom_entry = netlbl_domhsh_getentry(secattr->domain);
816 if (dom_entry == NULL) {
818 goto req_setattr_return;
820 switch (req->rsk_ops->family) {
822 if (dom_entry->type == NETLBL_NLTYPE_ADDRSELECT) {
823 struct inet_request_sock *req_inet = inet_rsk(req);
824 af4_entry = netlbl_domhsh_getentry_af4(secattr->domain,
826 if (af4_entry == NULL) {
828 goto req_setattr_return;
830 proto_type = af4_entry->type;
831 proto_cv4 = af4_entry->type_def.cipsov4;
833 proto_type = dom_entry->type;
834 proto_cv4 = dom_entry->type_def.cipsov4;
836 switch (proto_type) {
837 case NETLBL_NLTYPE_CIPSOV4:
838 ret_val = cipso_v4_req_setattr(req, proto_cv4, secattr);
840 case NETLBL_NLTYPE_UNLABELED:
841 /* just delete the protocols we support for right now
842 * but we could remove other protocols if needed */
843 cipso_v4_req_delattr(req);
850 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
852 /* since we don't support any IPv6 labeling protocols right
853 * now we can optimize everything away until we do */
858 ret_val = -EPROTONOSUPPORT;
867 * netlbl_req_delattr - Delete all the NetLabel labels on a socket
871 * Remove all the NetLabel labeling from @req.
874 void netlbl_req_delattr(struct request_sock *req)
876 cipso_v4_req_delattr(req);
880 * netlbl_skbuff_setattr - Label a packet using the correct protocol
882 * @family: protocol family
883 * @secattr: the security attributes
886 * Attach the correct label to the given packet using the security attributes
887 * specified in @secattr. Returns zero on success, negative values on failure.
890 int netlbl_skbuff_setattr(struct sk_buff *skb,
892 const struct netlbl_lsm_secattr *secattr)
896 struct netlbl_domaddr4_map *af4_entry;
902 af4_entry = netlbl_domhsh_getentry_af4(secattr->domain,
904 if (af4_entry == NULL) {
906 goto skbuff_setattr_return;
908 switch (af4_entry->type) {
909 case NETLBL_NLTYPE_CIPSOV4:
910 ret_val = cipso_v4_skbuff_setattr(skb,
911 af4_entry->type_def.cipsov4,
914 case NETLBL_NLTYPE_UNLABELED:
915 /* just delete the protocols we support for right now
916 * but we could remove other protocols if needed */
917 ret_val = cipso_v4_skbuff_delattr(skb);
923 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
925 /* since we don't support any IPv6 labeling protocols right
926 * now we can optimize everything away until we do */
931 ret_val = -EPROTONOSUPPORT;
934 skbuff_setattr_return:
940 * netlbl_skbuff_getattr - Determine the security attributes of a packet
942 * @family: protocol family
943 * @secattr: the security attributes
946 * Examines the given packet to see if a recognized form of packet labeling
947 * is present, if so it parses the packet label and returns the security
948 * attributes in @secattr. Returns zero on success, negative values on
952 int netlbl_skbuff_getattr(const struct sk_buff *skb,
954 struct netlbl_lsm_secattr *secattr)
958 if (CIPSO_V4_OPTEXIST(skb) &&
959 cipso_v4_skbuff_getattr(skb, secattr) == 0)
962 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
968 return netlbl_unlabel_getattr(skb, family, secattr);
972 * netlbl_skbuff_err - Handle a LSM error on a sk_buff
974 * @error: the error code
975 * @gateway: true if host is acting as a gateway, false otherwise
978 * Deal with a LSM problem when handling the packet in @skb, typically this is
979 * a permission denied problem (-EACCES). The correct action is determined
980 * according to the packet's labeling protocol.
983 void netlbl_skbuff_err(struct sk_buff *skb, int error, int gateway)
985 if (CIPSO_V4_OPTEXIST(skb))
986 cipso_v4_error(skb, error, gateway);
990 * netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches
993 * For all of the NetLabel protocols that support some form of label mapping
994 * cache, invalidate the cache. Returns zero on success, negative values on
998 void netlbl_cache_invalidate(void)
1000 cipso_v4_cache_invalidate();
1004 * netlbl_cache_add - Add an entry to a NetLabel protocol cache
1006 * @secattr: the packet's security attributes
1009 * Add the LSM security attributes for the given packet to the underlying
1010 * NetLabel protocol's label mapping cache. Returns zero on success, negative
1014 int netlbl_cache_add(const struct sk_buff *skb,
1015 const struct netlbl_lsm_secattr *secattr)
1017 if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0)
1020 if (CIPSO_V4_OPTEXIST(skb))
1021 return cipso_v4_cache_add(skb, secattr);
1027 * Protocol Engine Functions
1031 * netlbl_audit_start - Start an audit message
1032 * @type: audit message type
1033 * @audit_info: NetLabel audit information
1036 * Start an audit message using the type specified in @type and fill the audit
1037 * message with some fields common to all NetLabel audit messages. This
1038 * function should only be used by protocol engines, not LSMs. Returns a
1039 * pointer to the audit buffer on success, NULL on failure.
1042 struct audit_buffer *netlbl_audit_start(int type,
1043 struct netlbl_audit *audit_info)
1045 return netlbl_audit_start_common(type, audit_info);
1053 * netlbl_init - Initialize NetLabel
1056 * Perform the required NetLabel initialization before first use.
1059 static int __init netlbl_init(void)
1063 printk(KERN_INFO "NetLabel: Initializing\n");
1064 printk(KERN_INFO "NetLabel: domain hash size = %u\n",
1065 (1 << NETLBL_DOMHSH_BITSIZE));
1066 printk(KERN_INFO "NetLabel: protocols ="
1071 ret_val = netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE);
1075 ret_val = netlbl_unlabel_init(NETLBL_UNLHSH_BITSIZE);
1079 ret_val = netlbl_netlink_init();
1083 ret_val = netlbl_unlabel_defconf();
1086 printk(KERN_INFO "NetLabel: unlabeled traffic allowed by default\n");
1091 panic("NetLabel: failed to initialize properly (%d)\n", ret_val);
1094 subsys_initcall(netlbl_init);