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1/*
2 * NetLabel Kernel API
3 *
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
6 * as CIPSO and RIPSO.
7 *
8 * Author: Paul Moore <paul@paul-moore.com>
9 *
10 */
11
12/*
13 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008
14 *
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.
19 *
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.
24 *
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
28 *
29 */
30
31#include <linux/init.h>
32#include <linux/types.h>
33#include <linux/slab.h>
34#include <linux/audit.h>
35#include <linux/in.h>
36#include <linux/in6.h>
37#include <net/ip.h>
38#include <net/ipv6.h>
39#include <net/netlabel.h>
40#include <net/cipso_ipv4.h>
41#include <asm/bug.h>
42#include <linux/atomic.h>
43
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"
50
51/*
52 * Configuration Functions
53 */
54
55/**
56 * netlbl_cfg_map_del - Remove a NetLabel/LSM domain mapping
57 * @domain: the domain mapping to remove
58 * @family: address family
59 * @addr: IP address
60 * @mask: IP address mask
61 * @audit_info: NetLabel audit information
62 *
63 * Description:
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
66 * values on failure.
67 *
68 */
69int netlbl_cfg_map_del(const char *domain,
70 u16 family,
71 const void *addr,
72 const void *mask,
73 struct netlbl_audit *audit_info)
74{
75 if (addr == NULL && mask == NULL) {
76 return netlbl_domhsh_remove(domain, audit_info);
77 } else if (addr != NULL && mask != NULL) {
78 switch (family) {
79 case AF_INET:
80 return netlbl_domhsh_remove_af4(domain, addr, mask,
81 audit_info);
82 default:
83 return -EPFNOSUPPORT;
84 }
85 } else
86 return -EINVAL;
87}
88
89/**
90 * netlbl_cfg_unlbl_map_add - Add a new unlabeled mapping
91 * @domain: the domain mapping to add
92 * @family: address family
93 * @addr: IP address
94 * @mask: IP address mask
95 * @audit_info: NetLabel audit information
96 *
97 * Description:
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.
101 *
102 */
103int netlbl_cfg_unlbl_map_add(const char *domain,
104 u16 family,
105 const void *addr,
106 const void *mask,
107 struct netlbl_audit *audit_info)
108{
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;
116
117 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
118 if (entry == NULL)
119 return -ENOMEM;
120 if (domain != NULL) {
121 entry->domain = kstrdup(domain, GFP_ATOMIC);
122 if (entry->domain == NULL)
123 goto cfg_unlbl_map_add_failure;
124 }
125
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);
130 if (addrmap == NULL)
131 goto cfg_unlbl_map_add_failure;
132 INIT_LIST_HEAD(&addrmap->list4);
133 INIT_LIST_HEAD(&addrmap->list6);
134
135 switch (family) {
136 case AF_INET:
137 addr4 = addr;
138 mask4 = mask;
139 map4 = kzalloc(sizeof(*map4), GFP_ATOMIC);
140 if (map4 == NULL)
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,
147 &addrmap->list4);
148 if (ret_val != 0)
149 goto cfg_unlbl_map_add_failure;
150 break;
151 case AF_INET6:
152 addr6 = addr;
153 mask6 = mask;
154 map6 = kzalloc(sizeof(*map6), GFP_ATOMIC);
155 if (map6 == NULL)
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,
166 &addrmap->list4);
167 if (ret_val != 0)
168 goto cfg_unlbl_map_add_failure;
169 break;
170 default:
171 goto cfg_unlbl_map_add_failure;
172 break;
173 }
174
175 entry->type_def.addrsel = addrmap;
176 entry->type = NETLBL_NLTYPE_ADDRSELECT;
177 } else {
178 ret_val = -EINVAL;
179 goto cfg_unlbl_map_add_failure;
180 }
181
182 ret_val = netlbl_domhsh_add(entry, audit_info);
183 if (ret_val != 0)
184 goto cfg_unlbl_map_add_failure;
185
186 return 0;
187
188cfg_unlbl_map_add_failure:
189 kfree(entry->domain);
190 kfree(entry);
191 kfree(addrmap);
192 kfree(map4);
193 kfree(map6);
194 return ret_val;
195}
196
197
198/**
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
207 *
208 * Description:
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.
212 *
213 */
214int netlbl_cfg_unlbl_static_add(struct net *net,
215 const char *dev_name,
216 const void *addr,
217 const void *mask,
218 u16 family,
219 u32 secid,
220 struct netlbl_audit *audit_info)
221{
222 u32 addr_len;
223
224 switch (family) {
225 case AF_INET:
226 addr_len = sizeof(struct in_addr);
227 break;
228 case AF_INET6:
229 addr_len = sizeof(struct in6_addr);
230 break;
231 default:
232 return -EPFNOSUPPORT;
233 }
234
235 return netlbl_unlhsh_add(net,
236 dev_name, addr, mask, addr_len,
237 secid, audit_info);
238}
239
240/**
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
249 *
250 * Description:
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.
254 *
255 */
256int netlbl_cfg_unlbl_static_del(struct net *net,
257 const char *dev_name,
258 const void *addr,
259 const void *mask,
260 u16 family,
261 struct netlbl_audit *audit_info)
262{
263 u32 addr_len;
264
265 switch (family) {
266 case AF_INET:
267 addr_len = sizeof(struct in_addr);
268 break;
269 case AF_INET6:
270 addr_len = sizeof(struct in6_addr);
271 break;
272 default:
273 return -EPFNOSUPPORT;
274 }
275
276 return netlbl_unlhsh_remove(net,
277 dev_name, addr, mask, addr_len,
278 audit_info);
279}
280
281/**
282 * netlbl_cfg_cipsov4_add - Add a new CIPSOv4 DOI definition
283 * @doi_def: CIPSO DOI definition
284 * @audit_info: NetLabel audit information
285 *
286 * Description:
287 * Add a new CIPSO DOI definition as defined by @doi_def. Returns zero on
288 * success and negative values on failure.
289 *
290 */
291int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def,
292 struct netlbl_audit *audit_info)
293{
294 return cipso_v4_doi_add(doi_def, audit_info);
295}
296
297/**
298 * netlbl_cfg_cipsov4_del - Remove an existing CIPSOv4 DOI definition
299 * @doi: CIPSO DOI
300 * @audit_info: NetLabel audit information
301 *
302 * Description:
303 * Remove an existing CIPSO DOI definition matching @doi. Returns zero on
304 * success and negative values on failure.
305 *
306 */
307void netlbl_cfg_cipsov4_del(u32 doi, struct netlbl_audit *audit_info)
308{
309 cipso_v4_doi_remove(doi, audit_info);
310}
311
312/**
313 * netlbl_cfg_cipsov4_map_add - Add a new CIPSOv4 DOI mapping
314 * @doi: the CIPSO DOI
315 * @domain: the domain mapping to add
316 * @addr: IP address
317 * @mask: IP address mask
318 * @audit_info: NetLabel audit information
319 *
320 * Description:
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.
324 *
325 */
326int netlbl_cfg_cipsov4_map_add(u32 doi,
327 const char *domain,
328 const struct in_addr *addr,
329 const struct in_addr *mask,
330 struct netlbl_audit *audit_info)
331{
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;
337
338 doi_def = cipso_v4_doi_getdef(doi);
339 if (doi_def == NULL)
340 return -ENOENT;
341
342 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
343 if (entry == NULL)
344 goto out_entry;
345 if (domain != NULL) {
346 entry->domain = kstrdup(domain, GFP_ATOMIC);
347 if (entry->domain == NULL)
348 goto out_domain;
349 }
350
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);
356 if (addrmap == NULL)
357 goto out_addrmap;
358 INIT_LIST_HEAD(&addrmap->list4);
359 INIT_LIST_HEAD(&addrmap->list6);
360
361 addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC);
362 if (addrinfo == NULL)
363 goto out_addrinfo;
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);
370 if (ret_val != 0)
371 goto cfg_cipsov4_map_add_failure;
372
373 entry->type_def.addrsel = addrmap;
374 entry->type = NETLBL_NLTYPE_ADDRSELECT;
375 } else {
376 ret_val = -EINVAL;
377 goto out_addrmap;
378 }
379
380 ret_val = netlbl_domhsh_add(entry, audit_info);
381 if (ret_val != 0)
382 goto cfg_cipsov4_map_add_failure;
383
384 return 0;
385
386cfg_cipsov4_map_add_failure:
387 kfree(addrinfo);
388out_addrinfo:
389 kfree(addrmap);
390out_addrmap:
391 kfree(entry->domain);
392out_domain:
393 kfree(entry);
394out_entry:
395 cipso_v4_doi_putdef(doi_def);
396 return ret_val;
397}
398
399/*
400 * Security Attribute Functions
401 */
402
403/**
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
407 *
408 * Description:
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.
411 *
412 */
413int netlbl_secattr_catmap_walk(struct netlbl_lsm_secattr_catmap *catmap,
414 u32 offset)
415{
416 struct netlbl_lsm_secattr_catmap *iter = catmap;
417 u32 node_idx;
418 u32 node_bit;
419 NETLBL_CATMAP_MAPTYPE bitmap;
420
421 if (offset > iter->startbit) {
422 while (offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
423 iter = iter->next;
424 if (iter == NULL)
425 return -ENOENT;
426 }
427 node_idx = (offset - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
428 node_bit = offset - iter->startbit -
429 (NETLBL_CATMAP_MAPSIZE * node_idx);
430 } else {
431 node_idx = 0;
432 node_bit = 0;
433 }
434 bitmap = iter->bitmap[node_idx] >> node_bit;
435
436 for (;;) {
437 if (bitmap != 0) {
438 while ((bitmap & NETLBL_CATMAP_BIT) == 0) {
439 bitmap >>= 1;
440 node_bit++;
441 }
442 return iter->startbit +
443 (NETLBL_CATMAP_MAPSIZE * node_idx) + node_bit;
444 }
445 if (++node_idx >= NETLBL_CATMAP_MAPCNT) {
446 if (iter->next != NULL) {
447 iter = iter->next;
448 node_idx = 0;
449 } else
450 return -ENOENT;
451 }
452 bitmap = iter->bitmap[node_idx];
453 node_bit = 0;
454 }
455
456 return -ENOENT;
457}
458
459/**
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
463 *
464 * Description:
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.
468 *
469 */
470int netlbl_secattr_catmap_walk_rng(struct netlbl_lsm_secattr_catmap *catmap,
471 u32 offset)
472{
473 struct netlbl_lsm_secattr_catmap *iter = catmap;
474 u32 node_idx;
475 u32 node_bit;
476 NETLBL_CATMAP_MAPTYPE bitmask;
477 NETLBL_CATMAP_MAPTYPE bitmap;
478
479 if (offset > iter->startbit) {
480 while (offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
481 iter = iter->next;
482 if (iter == NULL)
483 return -ENOENT;
484 }
485 node_idx = (offset - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
486 node_bit = offset - iter->startbit -
487 (NETLBL_CATMAP_MAPSIZE * node_idx);
488 } else {
489 node_idx = 0;
490 node_bit = 0;
491 }
492 bitmask = NETLBL_CATMAP_BIT << node_bit;
493
494 for (;;) {
495 bitmap = iter->bitmap[node_idx];
496 while (bitmask != 0 && (bitmap & bitmask) != 0) {
497 bitmask <<= 1;
498 node_bit++;
499 }
500
501 if (bitmask != 0)
502 return iter->startbit +
503 (NETLBL_CATMAP_MAPSIZE * node_idx) +
504 node_bit - 1;
505 else if (++node_idx >= NETLBL_CATMAP_MAPCNT) {
506 if (iter->next == NULL)
507 return iter->startbit + NETLBL_CATMAP_SIZE - 1;
508 iter = iter->next;
509 node_idx = 0;
510 }
511 bitmask = NETLBL_CATMAP_BIT;
512 node_bit = 0;
513 }
514
515 return -ENOENT;
516}
517
518/**
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
523 *
524 * Description:
525 * Set the bit specified by @bit in @catmap. Returns zero on success,
526 * negative values on failure.
527 *
528 */
529int netlbl_secattr_catmap_setbit(struct netlbl_lsm_secattr_catmap *catmap,
530 u32 bit,
531 gfp_t flags)
532{
533 struct netlbl_lsm_secattr_catmap *iter = catmap;
534 u32 node_bit;
535 u32 node_idx;
536
537 while (iter->next != NULL &&
538 bit >= (iter->startbit + NETLBL_CATMAP_SIZE))
539 iter = iter->next;
540 if (bit >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
541 iter->next = netlbl_secattr_catmap_alloc(flags);
542 if (iter->next == NULL)
543 return -ENOMEM;
544 iter = iter->next;
545 iter->startbit = bit & ~(NETLBL_CATMAP_SIZE - 1);
546 }
547
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;
552
553 return 0;
554}
555
556/**
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
562 *
563 * Description:
564 * Set a range of bits, starting at @start and ending with @end. Returns zero
565 * on success, negative values on failure.
566 *
567 */
568int netlbl_secattr_catmap_setrng(struct netlbl_lsm_secattr_catmap *catmap,
569 u32 start,
570 u32 end,
571 gfp_t flags)
572{
573 int ret_val = 0;
574 struct netlbl_lsm_secattr_catmap *iter = catmap;
575 u32 iter_max_spot;
576 u32 spot;
577
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. */
583
584 while (iter->next != NULL &&
585 start >= (iter->startbit + NETLBL_CATMAP_SIZE))
586 iter = iter->next;
587 iter_max_spot = iter->startbit + NETLBL_CATMAP_SIZE;
588
589 for (spot = start; spot <= end && ret_val == 0; spot++) {
590 if (spot >= iter_max_spot && iter->next != NULL) {
591 iter = iter->next;
592 iter_max_spot = iter->startbit + NETLBL_CATMAP_SIZE;
593 }
594 ret_val = netlbl_secattr_catmap_setbit(iter, spot, GFP_ATOMIC);
595 }
596
597 return ret_val;
598}
599
600/*
601 * LSM Functions
602 */
603
604/**
605 * netlbl_enabled - Determine if the NetLabel subsystem is enabled
606 *
607 * Description:
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
613 * be disabled.
614 *
615 */
616int netlbl_enabled(void)
617{
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
620 * configuration */
621 return (atomic_read(&netlabel_mgmt_protocount) > 0);
622}
623
624/**
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
629 *
630 * Description:
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.
637 *
638 */
639int netlbl_sock_setattr(struct sock *sk,
640 u16 family,
641 const struct netlbl_lsm_secattr *secattr)
642{
643 int ret_val;
644 struct netlbl_dom_map *dom_entry;
645
646 rcu_read_lock();
647 dom_entry = netlbl_domhsh_getentry(secattr->domain);
648 if (dom_entry == NULL) {
649 ret_val = -ENOENT;
650 goto socket_setattr_return;
651 }
652 switch (family) {
653 case AF_INET:
654 switch (dom_entry->type) {
655 case NETLBL_NLTYPE_ADDRSELECT:
656 ret_val = -EDESTADDRREQ;
657 break;
658 case NETLBL_NLTYPE_CIPSOV4:
659 ret_val = cipso_v4_sock_setattr(sk,
660 dom_entry->type_def.cipsov4,
661 secattr);
662 break;
663 case NETLBL_NLTYPE_UNLABELED:
664 ret_val = 0;
665 break;
666 default:
667 ret_val = -ENOENT;
668 }
669 break;
670#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
671 case AF_INET6:
672 /* since we don't support any IPv6 labeling protocols right
673 * now we can optimize everything away until we do */
674 ret_val = 0;
675 break;
676#endif /* IPv6 */
677 default:
678 ret_val = -EPROTONOSUPPORT;
679 }
680
681socket_setattr_return:
682 rcu_read_unlock();
683 return ret_val;
684}
685
686/**
687 * netlbl_sock_delattr - Delete all the NetLabel labels on a socket
688 * @sk: the socket
689 *
690 * Description:
691 * Remove all the NetLabel labeling from @sk. The caller is responsible for
692 * ensuring that @sk is locked.
693 *
694 */
695void netlbl_sock_delattr(struct sock *sk)
696{
697 cipso_v4_sock_delattr(sk);
698}
699
700/**
701 * netlbl_sock_getattr - Determine the security attributes of a sock
702 * @sk: the sock
703 * @secattr: the security attributes
704 *
705 * Description:
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
709 * on failure.
710 *
711 */
712int netlbl_sock_getattr(struct sock *sk,
713 struct netlbl_lsm_secattr *secattr)
714{
715 int ret_val;
716
717 switch (sk->sk_family) {
718 case AF_INET:
719 ret_val = cipso_v4_sock_getattr(sk, secattr);
720 break;
721#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
722 case AF_INET6:
723 ret_val = -ENOMSG;
724 break;
725#endif /* IPv6 */
726 default:
727 ret_val = -EPROTONOSUPPORT;
728 }
729
730 return ret_val;
731}
732
733/**
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
738 *
739 * Description:
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.
743 *
744 */
745int netlbl_conn_setattr(struct sock *sk,
746 struct sockaddr *addr,
747 const struct netlbl_lsm_secattr *secattr)
748{
749 int ret_val;
750 struct sockaddr_in *addr4;
751 struct netlbl_domaddr4_map *af4_entry;
752
753 rcu_read_lock();
754 switch (addr->sa_family) {
755 case AF_INET:
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) {
760 ret_val = -ENOENT;
761 goto conn_setattr_return;
762 }
763 switch (af4_entry->type) {
764 case NETLBL_NLTYPE_CIPSOV4:
765 ret_val = cipso_v4_sock_setattr(sk,
766 af4_entry->type_def.cipsov4,
767 secattr);
768 break;
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);
773 ret_val = 0;
774 break;
775 default:
776 ret_val = -ENOENT;
777 }
778 break;
779#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
780 case AF_INET6:
781 /* since we don't support any IPv6 labeling protocols right
782 * now we can optimize everything away until we do */
783 ret_val = 0;
784 break;
785#endif /* IPv6 */
786 default:
787 ret_val = -EPROTONOSUPPORT;
788 }
789
790conn_setattr_return:
791 rcu_read_unlock();
792 return ret_val;
793}
794
795/**
796 * netlbl_req_setattr - Label a request socket using the correct protocol
797 * @req: the request socket to label
798 * @secattr: the security attributes
799 *
800 * Description:
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.
803 *
804 */
805int netlbl_req_setattr(struct request_sock *req,
806 const struct netlbl_lsm_secattr *secattr)
807{
808 int ret_val;
809 struct netlbl_dom_map *dom_entry;
810 struct netlbl_domaddr4_map *af4_entry;
811 u32 proto_type;
812 struct cipso_v4_doi *proto_cv4;
813
814 rcu_read_lock();
815 dom_entry = netlbl_domhsh_getentry(secattr->domain);
816 if (dom_entry == NULL) {
817 ret_val = -ENOENT;
818 goto req_setattr_return;
819 }
820 switch (req->rsk_ops->family) {
821 case AF_INET:
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,
825 req_inet->rmt_addr);
826 if (af4_entry == NULL) {
827 ret_val = -ENOENT;
828 goto req_setattr_return;
829 }
830 proto_type = af4_entry->type;
831 proto_cv4 = af4_entry->type_def.cipsov4;
832 } else {
833 proto_type = dom_entry->type;
834 proto_cv4 = dom_entry->type_def.cipsov4;
835 }
836 switch (proto_type) {
837 case NETLBL_NLTYPE_CIPSOV4:
838 ret_val = cipso_v4_req_setattr(req, proto_cv4, secattr);
839 break;
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);
844 ret_val = 0;
845 break;
846 default:
847 ret_val = -ENOENT;
848 }
849 break;
850#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
851 case AF_INET6:
852 /* since we don't support any IPv6 labeling protocols right
853 * now we can optimize everything away until we do */
854 ret_val = 0;
855 break;
856#endif /* IPv6 */
857 default:
858 ret_val = -EPROTONOSUPPORT;
859 }
860
861req_setattr_return:
862 rcu_read_unlock();
863 return ret_val;
864}
865
866/**
867* netlbl_req_delattr - Delete all the NetLabel labels on a socket
868* @req: the socket
869*
870* Description:
871* Remove all the NetLabel labeling from @req.
872*
873*/
874void netlbl_req_delattr(struct request_sock *req)
875{
876 cipso_v4_req_delattr(req);
877}
878
879/**
880 * netlbl_skbuff_setattr - Label a packet using the correct protocol
881 * @skb: the packet
882 * @family: protocol family
883 * @secattr: the security attributes
884 *
885 * Description:
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.
888 *
889 */
890int netlbl_skbuff_setattr(struct sk_buff *skb,
891 u16 family,
892 const struct netlbl_lsm_secattr *secattr)
893{
894 int ret_val;
895 struct iphdr *hdr4;
896 struct netlbl_domaddr4_map *af4_entry;
897
898 rcu_read_lock();
899 switch (family) {
900 case AF_INET:
901 hdr4 = ip_hdr(skb);
902 af4_entry = netlbl_domhsh_getentry_af4(secattr->domain,
903 hdr4->daddr);
904 if (af4_entry == NULL) {
905 ret_val = -ENOENT;
906 goto skbuff_setattr_return;
907 }
908 switch (af4_entry->type) {
909 case NETLBL_NLTYPE_CIPSOV4:
910 ret_val = cipso_v4_skbuff_setattr(skb,
911 af4_entry->type_def.cipsov4,
912 secattr);
913 break;
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);
918 break;
919 default:
920 ret_val = -ENOENT;
921 }
922 break;
923#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
924 case AF_INET6:
925 /* since we don't support any IPv6 labeling protocols right
926 * now we can optimize everything away until we do */
927 ret_val = 0;
928 break;
929#endif /* IPv6 */
930 default:
931 ret_val = -EPROTONOSUPPORT;
932 }
933
934skbuff_setattr_return:
935 rcu_read_unlock();
936 return ret_val;
937}
938
939/**
940 * netlbl_skbuff_getattr - Determine the security attributes of a packet
941 * @skb: the packet
942 * @family: protocol family
943 * @secattr: the security attributes
944 *
945 * Description:
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
949 * failure.
950 *
951 */
952int netlbl_skbuff_getattr(const struct sk_buff *skb,
953 u16 family,
954 struct netlbl_lsm_secattr *secattr)
955{
956 switch (family) {
957 case AF_INET:
958 if (CIPSO_V4_OPTEXIST(skb) &&
959 cipso_v4_skbuff_getattr(skb, secattr) == 0)
960 return 0;
961 break;
962#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
963 case AF_INET6:
964 break;
965#endif /* IPv6 */
966 }
967
968 return netlbl_unlabel_getattr(skb, family, secattr);
969}
970
971/**
972 * netlbl_skbuff_err - Handle a LSM error on a sk_buff
973 * @skb: the packet
974 * @error: the error code
975 * @gateway: true if host is acting as a gateway, false otherwise
976 *
977 * Description:
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.
981 *
982 */
983void netlbl_skbuff_err(struct sk_buff *skb, int error, int gateway)
984{
985 if (CIPSO_V4_OPTEXIST(skb))
986 cipso_v4_error(skb, error, gateway);
987}
988
989/**
990 * netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches
991 *
992 * Description:
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
995 * error.
996 *
997 */
998void netlbl_cache_invalidate(void)
999{
1000 cipso_v4_cache_invalidate();
1001}
1002
1003/**
1004 * netlbl_cache_add - Add an entry to a NetLabel protocol cache
1005 * @skb: the packet
1006 * @secattr: the packet's security attributes
1007 *
1008 * Description:
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
1011 * values on error.
1012 *
1013 */
1014int netlbl_cache_add(const struct sk_buff *skb,
1015 const struct netlbl_lsm_secattr *secattr)
1016{
1017 if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0)
1018 return -ENOMSG;
1019
1020 if (CIPSO_V4_OPTEXIST(skb))
1021 return cipso_v4_cache_add(skb, secattr);
1022
1023 return -ENOMSG;
1024}
1025
1026/*
1027 * Protocol Engine Functions
1028 */
1029
1030/**
1031 * netlbl_audit_start - Start an audit message
1032 * @type: audit message type
1033 * @audit_info: NetLabel audit information
1034 *
1035 * Description:
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.
1040 *
1041 */
1042struct audit_buffer *netlbl_audit_start(int type,
1043 struct netlbl_audit *audit_info)
1044{
1045 return netlbl_audit_start_common(type, audit_info);
1046}
1047
1048/*
1049 * Setup Functions
1050 */
1051
1052/**
1053 * netlbl_init - Initialize NetLabel
1054 *
1055 * Description:
1056 * Perform the required NetLabel initialization before first use.
1057 *
1058 */
1059static int __init netlbl_init(void)
1060{
1061 int ret_val;
1062
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 ="
1067 " UNLABELED"
1068 " CIPSOv4"
1069 "\n");
1070
1071 ret_val = netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE);
1072 if (ret_val != 0)
1073 goto init_failure;
1074
1075 ret_val = netlbl_unlabel_init(NETLBL_UNLHSH_BITSIZE);
1076 if (ret_val != 0)
1077 goto init_failure;
1078
1079 ret_val = netlbl_netlink_init();
1080 if (ret_val != 0)
1081 goto init_failure;
1082
1083 ret_val = netlbl_unlabel_defconf();
1084 if (ret_val != 0)
1085 goto init_failure;
1086 printk(KERN_INFO "NetLabel: unlabeled traffic allowed by default\n");
1087
1088 return 0;
1089
1090init_failure:
1091 panic("NetLabel: failed to initialize properly (%d)\n", ret_val);
1092}
1093
1094subsys_initcall(netlbl_init);
1/*
2 * NetLabel Kernel API
3 *
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
6 * as CIPSO and RIPSO.
7 *
8 * Author: Paul Moore <paul@paul-moore.com>
9 *
10 */
11
12/*
13 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008
14 *
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.
19 *
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.
24 *
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
28 *
29 */
30
31#include <linux/init.h>
32#include <linux/types.h>
33#include <linux/slab.h>
34#include <linux/audit.h>
35#include <linux/in.h>
36#include <linux/in6.h>
37#include <net/ip.h>
38#include <net/ipv6.h>
39#include <net/netlabel.h>
40#include <net/cipso_ipv4.h>
41#include <asm/bug.h>
42#include <linux/atomic.h>
43
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"
50
51/*
52 * Configuration Functions
53 */
54
55/**
56 * netlbl_cfg_map_del - Remove a NetLabel/LSM domain mapping
57 * @domain: the domain mapping to remove
58 * @family: address family
59 * @addr: IP address
60 * @mask: IP address mask
61 * @audit_info: NetLabel audit information
62 *
63 * Description:
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
66 * values on failure.
67 *
68 */
69int netlbl_cfg_map_del(const char *domain,
70 u16 family,
71 const void *addr,
72 const void *mask,
73 struct netlbl_audit *audit_info)
74{
75 if (addr == NULL && mask == NULL) {
76 return netlbl_domhsh_remove(domain, audit_info);
77 } else if (addr != NULL && mask != NULL) {
78 switch (family) {
79 case AF_INET:
80 return netlbl_domhsh_remove_af4(domain, addr, mask,
81 audit_info);
82 default:
83 return -EPFNOSUPPORT;
84 }
85 } else
86 return -EINVAL;
87}
88
89/**
90 * netlbl_cfg_unlbl_map_add - Add a new unlabeled mapping
91 * @domain: the domain mapping to add
92 * @family: address family
93 * @addr: IP address
94 * @mask: IP address mask
95 * @audit_info: NetLabel audit information
96 *
97 * Description:
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.
101 *
102 */
103int netlbl_cfg_unlbl_map_add(const char *domain,
104 u16 family,
105 const void *addr,
106 const void *mask,
107 struct netlbl_audit *audit_info)
108{
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
115 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
116 if (entry == NULL)
117 return -ENOMEM;
118 if (domain != NULL) {
119 entry->domain = kstrdup(domain, GFP_ATOMIC);
120 if (entry->domain == NULL)
121 goto cfg_unlbl_map_add_failure;
122 }
123
124 if (addr == NULL && mask == NULL)
125 entry->type = NETLBL_NLTYPE_UNLABELED;
126 else if (addr != NULL && mask != NULL) {
127 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
128 if (addrmap == NULL)
129 goto cfg_unlbl_map_add_failure;
130 INIT_LIST_HEAD(&addrmap->list4);
131 INIT_LIST_HEAD(&addrmap->list6);
132
133 switch (family) {
134 case AF_INET: {
135 const struct in_addr *addr4 = addr;
136 const struct in_addr *mask4 = mask;
137 map4 = kzalloc(sizeof(*map4), GFP_ATOMIC);
138 if (map4 == NULL)
139 goto cfg_unlbl_map_add_failure;
140 map4->type = NETLBL_NLTYPE_UNLABELED;
141 map4->list.addr = addr4->s_addr & mask4->s_addr;
142 map4->list.mask = mask4->s_addr;
143 map4->list.valid = 1;
144 ret_val = netlbl_af4list_add(&map4->list,
145 &addrmap->list4);
146 if (ret_val != 0)
147 goto cfg_unlbl_map_add_failure;
148 break;
149 }
150#if IS_ENABLED(CONFIG_IPV6)
151 case AF_INET6: {
152 const struct in6_addr *addr6 = addr;
153 const struct in6_addr *mask6 = mask;
154 map6 = kzalloc(sizeof(*map6), GFP_ATOMIC);
155 if (map6 == NULL)
156 goto cfg_unlbl_map_add_failure;
157 map6->type = NETLBL_NLTYPE_UNLABELED;
158 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 map6->list.mask = *mask6;
164 map6->list.valid = 1;
165 ret_val = netlbl_af6list_add(&map6->list,
166 &addrmap->list6);
167 if (ret_val != 0)
168 goto cfg_unlbl_map_add_failure;
169 break;
170 }
171#endif /* IPv6 */
172 default:
173 goto cfg_unlbl_map_add_failure;
174 break;
175 }
176
177 entry->type_def.addrsel = addrmap;
178 entry->type = NETLBL_NLTYPE_ADDRSELECT;
179 } else {
180 ret_val = -EINVAL;
181 goto cfg_unlbl_map_add_failure;
182 }
183
184 ret_val = netlbl_domhsh_add(entry, audit_info);
185 if (ret_val != 0)
186 goto cfg_unlbl_map_add_failure;
187
188 return 0;
189
190cfg_unlbl_map_add_failure:
191 kfree(entry->domain);
192 kfree(entry);
193 kfree(addrmap);
194 kfree(map4);
195 kfree(map6);
196 return ret_val;
197}
198
199
200/**
201 * netlbl_cfg_unlbl_static_add - Adds a new static label
202 * @net: network namespace
203 * @dev_name: interface name
204 * @addr: IP address in network byte order (struct in[6]_addr)
205 * @mask: address mask in network byte order (struct in[6]_addr)
206 * @family: address family
207 * @secid: LSM secid value for the entry
208 * @audit_info: NetLabel audit information
209 *
210 * Description:
211 * Adds a new NetLabel static label to be used when protocol provided labels
212 * are not present on incoming traffic. If @dev_name is NULL then the default
213 * interface will be used. Returns zero on success, negative values on failure.
214 *
215 */
216int netlbl_cfg_unlbl_static_add(struct net *net,
217 const char *dev_name,
218 const void *addr,
219 const void *mask,
220 u16 family,
221 u32 secid,
222 struct netlbl_audit *audit_info)
223{
224 u32 addr_len;
225
226 switch (family) {
227 case AF_INET:
228 addr_len = sizeof(struct in_addr);
229 break;
230#if IS_ENABLED(CONFIG_IPV6)
231 case AF_INET6:
232 addr_len = sizeof(struct in6_addr);
233 break;
234#endif /* IPv6 */
235 default:
236 return -EPFNOSUPPORT;
237 }
238
239 return netlbl_unlhsh_add(net,
240 dev_name, addr, mask, addr_len,
241 secid, audit_info);
242}
243
244/**
245 * netlbl_cfg_unlbl_static_del - Removes an existing static label
246 * @net: network namespace
247 * @dev_name: interface name
248 * @addr: IP address in network byte order (struct in[6]_addr)
249 * @mask: address mask in network byte order (struct in[6]_addr)
250 * @family: address family
251 * @secid: LSM secid value for the entry
252 * @audit_info: NetLabel audit information
253 *
254 * Description:
255 * Removes an existing NetLabel static label used when protocol provided labels
256 * are not present on incoming traffic. If @dev_name is NULL then the default
257 * interface will be used. Returns zero on success, negative values on failure.
258 *
259 */
260int netlbl_cfg_unlbl_static_del(struct net *net,
261 const char *dev_name,
262 const void *addr,
263 const void *mask,
264 u16 family,
265 struct netlbl_audit *audit_info)
266{
267 u32 addr_len;
268
269 switch (family) {
270 case AF_INET:
271 addr_len = sizeof(struct in_addr);
272 break;
273#if IS_ENABLED(CONFIG_IPV6)
274 case AF_INET6:
275 addr_len = sizeof(struct in6_addr);
276 break;
277#endif /* IPv6 */
278 default:
279 return -EPFNOSUPPORT;
280 }
281
282 return netlbl_unlhsh_remove(net,
283 dev_name, addr, mask, addr_len,
284 audit_info);
285}
286
287/**
288 * netlbl_cfg_cipsov4_add - Add a new CIPSOv4 DOI definition
289 * @doi_def: CIPSO DOI definition
290 * @audit_info: NetLabel audit information
291 *
292 * Description:
293 * Add a new CIPSO DOI definition as defined by @doi_def. Returns zero on
294 * success and negative values on failure.
295 *
296 */
297int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def,
298 struct netlbl_audit *audit_info)
299{
300 return cipso_v4_doi_add(doi_def, audit_info);
301}
302
303/**
304 * netlbl_cfg_cipsov4_del - Remove an existing CIPSOv4 DOI definition
305 * @doi: CIPSO DOI
306 * @audit_info: NetLabel audit information
307 *
308 * Description:
309 * Remove an existing CIPSO DOI definition matching @doi. Returns zero on
310 * success and negative values on failure.
311 *
312 */
313void netlbl_cfg_cipsov4_del(u32 doi, struct netlbl_audit *audit_info)
314{
315 cipso_v4_doi_remove(doi, audit_info);
316}
317
318/**
319 * netlbl_cfg_cipsov4_map_add - Add a new CIPSOv4 DOI mapping
320 * @doi: the CIPSO DOI
321 * @domain: the domain mapping to add
322 * @addr: IP address
323 * @mask: IP address mask
324 * @audit_info: NetLabel audit information
325 *
326 * Description:
327 * Add a new NetLabel/LSM domain mapping for the given CIPSO DOI to the NetLabel
328 * subsystem. A @domain value of NULL adds a new default domain mapping.
329 * Returns zero on success, negative values on failure.
330 *
331 */
332int netlbl_cfg_cipsov4_map_add(u32 doi,
333 const char *domain,
334 const struct in_addr *addr,
335 const struct in_addr *mask,
336 struct netlbl_audit *audit_info)
337{
338 int ret_val = -ENOMEM;
339 struct cipso_v4_doi *doi_def;
340 struct netlbl_dom_map *entry;
341 struct netlbl_domaddr_map *addrmap = NULL;
342 struct netlbl_domaddr4_map *addrinfo = NULL;
343
344 doi_def = cipso_v4_doi_getdef(doi);
345 if (doi_def == NULL)
346 return -ENOENT;
347
348 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
349 if (entry == NULL)
350 goto out_entry;
351 if (domain != NULL) {
352 entry->domain = kstrdup(domain, GFP_ATOMIC);
353 if (entry->domain == NULL)
354 goto out_domain;
355 }
356
357 if (addr == NULL && mask == NULL) {
358 entry->type_def.cipsov4 = doi_def;
359 entry->type = NETLBL_NLTYPE_CIPSOV4;
360 } else if (addr != NULL && mask != NULL) {
361 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
362 if (addrmap == NULL)
363 goto out_addrmap;
364 INIT_LIST_HEAD(&addrmap->list4);
365 INIT_LIST_HEAD(&addrmap->list6);
366
367 addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC);
368 if (addrinfo == NULL)
369 goto out_addrinfo;
370 addrinfo->type_def.cipsov4 = doi_def;
371 addrinfo->type = NETLBL_NLTYPE_CIPSOV4;
372 addrinfo->list.addr = addr->s_addr & mask->s_addr;
373 addrinfo->list.mask = mask->s_addr;
374 addrinfo->list.valid = 1;
375 ret_val = netlbl_af4list_add(&addrinfo->list, &addrmap->list4);
376 if (ret_val != 0)
377 goto cfg_cipsov4_map_add_failure;
378
379 entry->type_def.addrsel = addrmap;
380 entry->type = NETLBL_NLTYPE_ADDRSELECT;
381 } else {
382 ret_val = -EINVAL;
383 goto out_addrmap;
384 }
385
386 ret_val = netlbl_domhsh_add(entry, audit_info);
387 if (ret_val != 0)
388 goto cfg_cipsov4_map_add_failure;
389
390 return 0;
391
392cfg_cipsov4_map_add_failure:
393 kfree(addrinfo);
394out_addrinfo:
395 kfree(addrmap);
396out_addrmap:
397 kfree(entry->domain);
398out_domain:
399 kfree(entry);
400out_entry:
401 cipso_v4_doi_putdef(doi_def);
402 return ret_val;
403}
404
405/*
406 * Security Attribute Functions
407 */
408
409/**
410 * netlbl_secattr_catmap_walk - Walk a LSM secattr catmap looking for a bit
411 * @catmap: the category bitmap
412 * @offset: the offset to start searching at, in bits
413 *
414 * Description:
415 * This function walks a LSM secattr category bitmap starting at @offset and
416 * returns the spot of the first set bit or -ENOENT if no bits are set.
417 *
418 */
419int netlbl_secattr_catmap_walk(struct netlbl_lsm_secattr_catmap *catmap,
420 u32 offset)
421{
422 struct netlbl_lsm_secattr_catmap *iter = catmap;
423 u32 node_idx;
424 u32 node_bit;
425 NETLBL_CATMAP_MAPTYPE bitmap;
426
427 if (offset > iter->startbit) {
428 while (offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
429 iter = iter->next;
430 if (iter == NULL)
431 return -ENOENT;
432 }
433 node_idx = (offset - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
434 node_bit = offset - iter->startbit -
435 (NETLBL_CATMAP_MAPSIZE * node_idx);
436 } else {
437 node_idx = 0;
438 node_bit = 0;
439 }
440 bitmap = iter->bitmap[node_idx] >> node_bit;
441
442 for (;;) {
443 if (bitmap != 0) {
444 while ((bitmap & NETLBL_CATMAP_BIT) == 0) {
445 bitmap >>= 1;
446 node_bit++;
447 }
448 return iter->startbit +
449 (NETLBL_CATMAP_MAPSIZE * node_idx) + node_bit;
450 }
451 if (++node_idx >= NETLBL_CATMAP_MAPCNT) {
452 if (iter->next != NULL) {
453 iter = iter->next;
454 node_idx = 0;
455 } else
456 return -ENOENT;
457 }
458 bitmap = iter->bitmap[node_idx];
459 node_bit = 0;
460 }
461
462 return -ENOENT;
463}
464
465/**
466 * netlbl_secattr_catmap_walk_rng - Find the end of a string of set bits
467 * @catmap: the category bitmap
468 * @offset: the offset to start searching at, in bits
469 *
470 * Description:
471 * This function walks a LSM secattr category bitmap starting at @offset and
472 * returns the spot of the first cleared bit or -ENOENT if the offset is past
473 * the end of the bitmap.
474 *
475 */
476int netlbl_secattr_catmap_walk_rng(struct netlbl_lsm_secattr_catmap *catmap,
477 u32 offset)
478{
479 struct netlbl_lsm_secattr_catmap *iter = catmap;
480 u32 node_idx;
481 u32 node_bit;
482 NETLBL_CATMAP_MAPTYPE bitmask;
483 NETLBL_CATMAP_MAPTYPE bitmap;
484
485 if (offset > iter->startbit) {
486 while (offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
487 iter = iter->next;
488 if (iter == NULL)
489 return -ENOENT;
490 }
491 node_idx = (offset - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
492 node_bit = offset - iter->startbit -
493 (NETLBL_CATMAP_MAPSIZE * node_idx);
494 } else {
495 node_idx = 0;
496 node_bit = 0;
497 }
498 bitmask = NETLBL_CATMAP_BIT << node_bit;
499
500 for (;;) {
501 bitmap = iter->bitmap[node_idx];
502 while (bitmask != 0 && (bitmap & bitmask) != 0) {
503 bitmask <<= 1;
504 node_bit++;
505 }
506
507 if (bitmask != 0)
508 return iter->startbit +
509 (NETLBL_CATMAP_MAPSIZE * node_idx) +
510 node_bit - 1;
511 else if (++node_idx >= NETLBL_CATMAP_MAPCNT) {
512 if (iter->next == NULL)
513 return iter->startbit + NETLBL_CATMAP_SIZE - 1;
514 iter = iter->next;
515 node_idx = 0;
516 }
517 bitmask = NETLBL_CATMAP_BIT;
518 node_bit = 0;
519 }
520
521 return -ENOENT;
522}
523
524/**
525 * netlbl_secattr_catmap_setbit - Set a bit in a LSM secattr catmap
526 * @catmap: the category bitmap
527 * @bit: the bit to set
528 * @flags: memory allocation flags
529 *
530 * Description:
531 * Set the bit specified by @bit in @catmap. Returns zero on success,
532 * negative values on failure.
533 *
534 */
535int netlbl_secattr_catmap_setbit(struct netlbl_lsm_secattr_catmap *catmap,
536 u32 bit,
537 gfp_t flags)
538{
539 struct netlbl_lsm_secattr_catmap *iter = catmap;
540 u32 node_bit;
541 u32 node_idx;
542
543 while (iter->next != NULL &&
544 bit >= (iter->startbit + NETLBL_CATMAP_SIZE))
545 iter = iter->next;
546 if (bit >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
547 iter->next = netlbl_secattr_catmap_alloc(flags);
548 if (iter->next == NULL)
549 return -ENOMEM;
550 iter = iter->next;
551 iter->startbit = bit & ~(NETLBL_CATMAP_SIZE - 1);
552 }
553
554 /* gcc always rounds to zero when doing integer division */
555 node_idx = (bit - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
556 node_bit = bit - iter->startbit - (NETLBL_CATMAP_MAPSIZE * node_idx);
557 iter->bitmap[node_idx] |= NETLBL_CATMAP_BIT << node_bit;
558
559 return 0;
560}
561
562/**
563 * netlbl_secattr_catmap_setrng - Set a range of bits in a LSM secattr catmap
564 * @catmap: the category bitmap
565 * @start: the starting bit
566 * @end: the last bit in the string
567 * @flags: memory allocation flags
568 *
569 * Description:
570 * Set a range of bits, starting at @start and ending with @end. Returns zero
571 * on success, negative values on failure.
572 *
573 */
574int netlbl_secattr_catmap_setrng(struct netlbl_lsm_secattr_catmap *catmap,
575 u32 start,
576 u32 end,
577 gfp_t flags)
578{
579 int ret_val = 0;
580 struct netlbl_lsm_secattr_catmap *iter = catmap;
581 u32 iter_max_spot;
582 u32 spot;
583
584 /* XXX - This could probably be made a bit faster by combining writes
585 * to the catmap instead of setting a single bit each time, but for
586 * right now skipping to the start of the range in the catmap should
587 * be a nice improvement over calling the individual setbit function
588 * repeatedly from a loop. */
589
590 while (iter->next != NULL &&
591 start >= (iter->startbit + NETLBL_CATMAP_SIZE))
592 iter = iter->next;
593 iter_max_spot = iter->startbit + NETLBL_CATMAP_SIZE;
594
595 for (spot = start; spot <= end && ret_val == 0; spot++) {
596 if (spot >= iter_max_spot && iter->next != NULL) {
597 iter = iter->next;
598 iter_max_spot = iter->startbit + NETLBL_CATMAP_SIZE;
599 }
600 ret_val = netlbl_secattr_catmap_setbit(iter, spot, flags);
601 }
602
603 return ret_val;
604}
605
606/*
607 * LSM Functions
608 */
609
610/**
611 * netlbl_enabled - Determine if the NetLabel subsystem is enabled
612 *
613 * Description:
614 * The LSM can use this function to determine if it should use NetLabel
615 * security attributes in it's enforcement mechanism. Currently, NetLabel is
616 * considered to be enabled when it's configuration contains a valid setup for
617 * at least one labeled protocol (i.e. NetLabel can understand incoming
618 * labeled packets of at least one type); otherwise NetLabel is considered to
619 * be disabled.
620 *
621 */
622int netlbl_enabled(void)
623{
624 /* At some point we probably want to expose this mechanism to the user
625 * as well so that admins can toggle NetLabel regardless of the
626 * configuration */
627 return (atomic_read(&netlabel_mgmt_protocount) > 0);
628}
629
630/**
631 * netlbl_sock_setattr - Label a socket using the correct protocol
632 * @sk: the socket to label
633 * @family: protocol family
634 * @secattr: the security attributes
635 *
636 * Description:
637 * Attach the correct label to the given socket using the security attributes
638 * specified in @secattr. This function requires exclusive access to @sk,
639 * which means it either needs to be in the process of being created or locked.
640 * Returns zero on success, -EDESTADDRREQ if the domain is configured to use
641 * network address selectors (can't blindly label the socket), and negative
642 * values on all other failures.
643 *
644 */
645int netlbl_sock_setattr(struct sock *sk,
646 u16 family,
647 const struct netlbl_lsm_secattr *secattr)
648{
649 int ret_val;
650 struct netlbl_dom_map *dom_entry;
651
652 rcu_read_lock();
653 dom_entry = netlbl_domhsh_getentry(secattr->domain);
654 if (dom_entry == NULL) {
655 ret_val = -ENOENT;
656 goto socket_setattr_return;
657 }
658 switch (family) {
659 case AF_INET:
660 switch (dom_entry->type) {
661 case NETLBL_NLTYPE_ADDRSELECT:
662 ret_val = -EDESTADDRREQ;
663 break;
664 case NETLBL_NLTYPE_CIPSOV4:
665 ret_val = cipso_v4_sock_setattr(sk,
666 dom_entry->type_def.cipsov4,
667 secattr);
668 break;
669 case NETLBL_NLTYPE_UNLABELED:
670 ret_val = 0;
671 break;
672 default:
673 ret_val = -ENOENT;
674 }
675 break;
676#if IS_ENABLED(CONFIG_IPV6)
677 case AF_INET6:
678 /* since we don't support any IPv6 labeling protocols right
679 * now we can optimize everything away until we do */
680 ret_val = 0;
681 break;
682#endif /* IPv6 */
683 default:
684 ret_val = -EPROTONOSUPPORT;
685 }
686
687socket_setattr_return:
688 rcu_read_unlock();
689 return ret_val;
690}
691
692/**
693 * netlbl_sock_delattr - Delete all the NetLabel labels on a socket
694 * @sk: the socket
695 *
696 * Description:
697 * Remove all the NetLabel labeling from @sk. The caller is responsible for
698 * ensuring that @sk is locked.
699 *
700 */
701void netlbl_sock_delattr(struct sock *sk)
702{
703 cipso_v4_sock_delattr(sk);
704}
705
706/**
707 * netlbl_sock_getattr - Determine the security attributes of a sock
708 * @sk: the sock
709 * @secattr: the security attributes
710 *
711 * Description:
712 * Examines the given sock to see if any NetLabel style labeling has been
713 * applied to the sock, if so it parses the socket label and returns the
714 * security attributes in @secattr. Returns zero on success, negative values
715 * on failure.
716 *
717 */
718int netlbl_sock_getattr(struct sock *sk,
719 struct netlbl_lsm_secattr *secattr)
720{
721 int ret_val;
722
723 switch (sk->sk_family) {
724 case AF_INET:
725 ret_val = cipso_v4_sock_getattr(sk, secattr);
726 break;
727#if IS_ENABLED(CONFIG_IPV6)
728 case AF_INET6:
729 ret_val = -ENOMSG;
730 break;
731#endif /* IPv6 */
732 default:
733 ret_val = -EPROTONOSUPPORT;
734 }
735
736 return ret_val;
737}
738
739/**
740 * netlbl_conn_setattr - Label a connected socket using the correct protocol
741 * @sk: the socket to label
742 * @addr: the destination address
743 * @secattr: the security attributes
744 *
745 * Description:
746 * Attach the correct label to the given connected socket using the security
747 * attributes specified in @secattr. The caller is responsible for ensuring
748 * that @sk is locked. Returns zero on success, negative values on failure.
749 *
750 */
751int netlbl_conn_setattr(struct sock *sk,
752 struct sockaddr *addr,
753 const struct netlbl_lsm_secattr *secattr)
754{
755 int ret_val;
756 struct sockaddr_in *addr4;
757 struct netlbl_domaddr4_map *af4_entry;
758
759 rcu_read_lock();
760 switch (addr->sa_family) {
761 case AF_INET:
762 addr4 = (struct sockaddr_in *)addr;
763 af4_entry = netlbl_domhsh_getentry_af4(secattr->domain,
764 addr4->sin_addr.s_addr);
765 if (af4_entry == NULL) {
766 ret_val = -ENOENT;
767 goto conn_setattr_return;
768 }
769 switch (af4_entry->type) {
770 case NETLBL_NLTYPE_CIPSOV4:
771 ret_val = cipso_v4_sock_setattr(sk,
772 af4_entry->type_def.cipsov4,
773 secattr);
774 break;
775 case NETLBL_NLTYPE_UNLABELED:
776 /* just delete the protocols we support for right now
777 * but we could remove other protocols if needed */
778 cipso_v4_sock_delattr(sk);
779 ret_val = 0;
780 break;
781 default:
782 ret_val = -ENOENT;
783 }
784 break;
785#if IS_ENABLED(CONFIG_IPV6)
786 case AF_INET6:
787 /* since we don't support any IPv6 labeling protocols right
788 * now we can optimize everything away until we do */
789 ret_val = 0;
790 break;
791#endif /* IPv6 */
792 default:
793 ret_val = -EPROTONOSUPPORT;
794 }
795
796conn_setattr_return:
797 rcu_read_unlock();
798 return ret_val;
799}
800
801/**
802 * netlbl_req_setattr - Label a request socket using the correct protocol
803 * @req: the request socket to label
804 * @secattr: the security attributes
805 *
806 * Description:
807 * Attach the correct label to the given socket using the security attributes
808 * specified in @secattr. Returns zero on success, negative values on failure.
809 *
810 */
811int netlbl_req_setattr(struct request_sock *req,
812 const struct netlbl_lsm_secattr *secattr)
813{
814 int ret_val;
815 struct netlbl_dom_map *dom_entry;
816 struct netlbl_domaddr4_map *af4_entry;
817 u32 proto_type;
818 struct cipso_v4_doi *proto_cv4;
819
820 rcu_read_lock();
821 dom_entry = netlbl_domhsh_getentry(secattr->domain);
822 if (dom_entry == NULL) {
823 ret_val = -ENOENT;
824 goto req_setattr_return;
825 }
826 switch (req->rsk_ops->family) {
827 case AF_INET:
828 if (dom_entry->type == NETLBL_NLTYPE_ADDRSELECT) {
829 struct inet_request_sock *req_inet = inet_rsk(req);
830 af4_entry = netlbl_domhsh_getentry_af4(secattr->domain,
831 req_inet->rmt_addr);
832 if (af4_entry == NULL) {
833 ret_val = -ENOENT;
834 goto req_setattr_return;
835 }
836 proto_type = af4_entry->type;
837 proto_cv4 = af4_entry->type_def.cipsov4;
838 } else {
839 proto_type = dom_entry->type;
840 proto_cv4 = dom_entry->type_def.cipsov4;
841 }
842 switch (proto_type) {
843 case NETLBL_NLTYPE_CIPSOV4:
844 ret_val = cipso_v4_req_setattr(req, proto_cv4, secattr);
845 break;
846 case NETLBL_NLTYPE_UNLABELED:
847 /* just delete the protocols we support for right now
848 * but we could remove other protocols if needed */
849 cipso_v4_req_delattr(req);
850 ret_val = 0;
851 break;
852 default:
853 ret_val = -ENOENT;
854 }
855 break;
856#if IS_ENABLED(CONFIG_IPV6)
857 case AF_INET6:
858 /* since we don't support any IPv6 labeling protocols right
859 * now we can optimize everything away until we do */
860 ret_val = 0;
861 break;
862#endif /* IPv6 */
863 default:
864 ret_val = -EPROTONOSUPPORT;
865 }
866
867req_setattr_return:
868 rcu_read_unlock();
869 return ret_val;
870}
871
872/**
873* netlbl_req_delattr - Delete all the NetLabel labels on a socket
874* @req: the socket
875*
876* Description:
877* Remove all the NetLabel labeling from @req.
878*
879*/
880void netlbl_req_delattr(struct request_sock *req)
881{
882 cipso_v4_req_delattr(req);
883}
884
885/**
886 * netlbl_skbuff_setattr - Label a packet using the correct protocol
887 * @skb: the packet
888 * @family: protocol family
889 * @secattr: the security attributes
890 *
891 * Description:
892 * Attach the correct label to the given packet using the security attributes
893 * specified in @secattr. Returns zero on success, negative values on failure.
894 *
895 */
896int netlbl_skbuff_setattr(struct sk_buff *skb,
897 u16 family,
898 const struct netlbl_lsm_secattr *secattr)
899{
900 int ret_val;
901 struct iphdr *hdr4;
902 struct netlbl_domaddr4_map *af4_entry;
903
904 rcu_read_lock();
905 switch (family) {
906 case AF_INET:
907 hdr4 = ip_hdr(skb);
908 af4_entry = netlbl_domhsh_getentry_af4(secattr->domain,
909 hdr4->daddr);
910 if (af4_entry == NULL) {
911 ret_val = -ENOENT;
912 goto skbuff_setattr_return;
913 }
914 switch (af4_entry->type) {
915 case NETLBL_NLTYPE_CIPSOV4:
916 ret_val = cipso_v4_skbuff_setattr(skb,
917 af4_entry->type_def.cipsov4,
918 secattr);
919 break;
920 case NETLBL_NLTYPE_UNLABELED:
921 /* just delete the protocols we support for right now
922 * but we could remove other protocols if needed */
923 ret_val = cipso_v4_skbuff_delattr(skb);
924 break;
925 default:
926 ret_val = -ENOENT;
927 }
928 break;
929#if IS_ENABLED(CONFIG_IPV6)
930 case AF_INET6:
931 /* since we don't support any IPv6 labeling protocols right
932 * now we can optimize everything away until we do */
933 ret_val = 0;
934 break;
935#endif /* IPv6 */
936 default:
937 ret_val = -EPROTONOSUPPORT;
938 }
939
940skbuff_setattr_return:
941 rcu_read_unlock();
942 return ret_val;
943}
944
945/**
946 * netlbl_skbuff_getattr - Determine the security attributes of a packet
947 * @skb: the packet
948 * @family: protocol family
949 * @secattr: the security attributes
950 *
951 * Description:
952 * Examines the given packet to see if a recognized form of packet labeling
953 * is present, if so it parses the packet label and returns the security
954 * attributes in @secattr. Returns zero on success, negative values on
955 * failure.
956 *
957 */
958int netlbl_skbuff_getattr(const struct sk_buff *skb,
959 u16 family,
960 struct netlbl_lsm_secattr *secattr)
961{
962 switch (family) {
963 case AF_INET:
964 if (CIPSO_V4_OPTEXIST(skb) &&
965 cipso_v4_skbuff_getattr(skb, secattr) == 0)
966 return 0;
967 break;
968#if IS_ENABLED(CONFIG_IPV6)
969 case AF_INET6:
970 break;
971#endif /* IPv6 */
972 }
973
974 return netlbl_unlabel_getattr(skb, family, secattr);
975}
976
977/**
978 * netlbl_skbuff_err - Handle a LSM error on a sk_buff
979 * @skb: the packet
980 * @error: the error code
981 * @gateway: true if host is acting as a gateway, false otherwise
982 *
983 * Description:
984 * Deal with a LSM problem when handling the packet in @skb, typically this is
985 * a permission denied problem (-EACCES). The correct action is determined
986 * according to the packet's labeling protocol.
987 *
988 */
989void netlbl_skbuff_err(struct sk_buff *skb, int error, int gateway)
990{
991 if (CIPSO_V4_OPTEXIST(skb))
992 cipso_v4_error(skb, error, gateway);
993}
994
995/**
996 * netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches
997 *
998 * Description:
999 * For all of the NetLabel protocols that support some form of label mapping
1000 * cache, invalidate the cache. Returns zero on success, negative values on
1001 * error.
1002 *
1003 */
1004void netlbl_cache_invalidate(void)
1005{
1006 cipso_v4_cache_invalidate();
1007}
1008
1009/**
1010 * netlbl_cache_add - Add an entry to a NetLabel protocol cache
1011 * @skb: the packet
1012 * @secattr: the packet's security attributes
1013 *
1014 * Description:
1015 * Add the LSM security attributes for the given packet to the underlying
1016 * NetLabel protocol's label mapping cache. Returns zero on success, negative
1017 * values on error.
1018 *
1019 */
1020int netlbl_cache_add(const struct sk_buff *skb,
1021 const struct netlbl_lsm_secattr *secattr)
1022{
1023 if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0)
1024 return -ENOMSG;
1025
1026 if (CIPSO_V4_OPTEXIST(skb))
1027 return cipso_v4_cache_add(skb, secattr);
1028
1029 return -ENOMSG;
1030}
1031
1032/*
1033 * Protocol Engine Functions
1034 */
1035
1036/**
1037 * netlbl_audit_start - Start an audit message
1038 * @type: audit message type
1039 * @audit_info: NetLabel audit information
1040 *
1041 * Description:
1042 * Start an audit message using the type specified in @type and fill the audit
1043 * message with some fields common to all NetLabel audit messages. This
1044 * function should only be used by protocol engines, not LSMs. Returns a
1045 * pointer to the audit buffer on success, NULL on failure.
1046 *
1047 */
1048struct audit_buffer *netlbl_audit_start(int type,
1049 struct netlbl_audit *audit_info)
1050{
1051 return netlbl_audit_start_common(type, audit_info);
1052}
1053
1054/*
1055 * Setup Functions
1056 */
1057
1058/**
1059 * netlbl_init - Initialize NetLabel
1060 *
1061 * Description:
1062 * Perform the required NetLabel initialization before first use.
1063 *
1064 */
1065static int __init netlbl_init(void)
1066{
1067 int ret_val;
1068
1069 printk(KERN_INFO "NetLabel: Initializing\n");
1070 printk(KERN_INFO "NetLabel: domain hash size = %u\n",
1071 (1 << NETLBL_DOMHSH_BITSIZE));
1072 printk(KERN_INFO "NetLabel: protocols ="
1073 " UNLABELED"
1074 " CIPSOv4"
1075 "\n");
1076
1077 ret_val = netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE);
1078 if (ret_val != 0)
1079 goto init_failure;
1080
1081 ret_val = netlbl_unlabel_init(NETLBL_UNLHSH_BITSIZE);
1082 if (ret_val != 0)
1083 goto init_failure;
1084
1085 ret_val = netlbl_netlink_init();
1086 if (ret_val != 0)
1087 goto init_failure;
1088
1089 ret_val = netlbl_unlabel_defconf();
1090 if (ret_val != 0)
1091 goto init_failure;
1092 printk(KERN_INFO "NetLabel: unlabeled traffic allowed by default\n");
1093
1094 return 0;
1095
1096init_failure:
1097 panic("NetLabel: failed to initialize properly (%d)\n", ret_val);
1098}
1099
1100subsys_initcall(netlbl_init);