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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, see <http://www.gnu.org/licenses/>.
27 *
28 */
29
30#include <linux/init.h>
31#include <linux/types.h>
32#include <linux/slab.h>
33#include <linux/audit.h>
34#include <linux/in.h>
35#include <linux/in6.h>
36#include <net/ip.h>
37#include <net/ipv6.h>
38#include <net/netlabel.h>
39#include <net/cipso_ipv4.h>
40#include <asm/bug.h>
41#include <linux/atomic.h>
42
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"
49
50/*
51 * Configuration Functions
52 */
53
54/**
55 * netlbl_cfg_map_del - Remove a NetLabel/LSM domain mapping
56 * @domain: the domain mapping to remove
57 * @family: address family
58 * @addr: IP address
59 * @mask: IP address mask
60 * @audit_info: NetLabel audit information
61 *
62 * Description:
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
65 * values on failure.
66 *
67 */
68int netlbl_cfg_map_del(const char *domain,
69 u16 family,
70 const void *addr,
71 const void *mask,
72 struct netlbl_audit *audit_info)
73{
74 if (addr == NULL && mask == NULL) {
75 return netlbl_domhsh_remove(domain, audit_info);
76 } else if (addr != NULL && mask != NULL) {
77 switch (family) {
78 case AF_INET:
79 return netlbl_domhsh_remove_af4(domain, addr, mask,
80 audit_info);
81 default:
82 return -EPFNOSUPPORT;
83 }
84 } else
85 return -EINVAL;
86}
87
88/**
89 * netlbl_cfg_unlbl_map_add - Add a new unlabeled mapping
90 * @domain: the domain mapping to add
91 * @family: address family
92 * @addr: IP address
93 * @mask: IP address mask
94 * @audit_info: NetLabel audit information
95 *
96 * Description:
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.
100 *
101 */
102int netlbl_cfg_unlbl_map_add(const char *domain,
103 u16 family,
104 const void *addr,
105 const void *mask,
106 struct netlbl_audit *audit_info)
107{
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;
113
114 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
115 if (entry == NULL)
116 return -ENOMEM;
117 if (domain != NULL) {
118 entry->domain = kstrdup(domain, GFP_ATOMIC);
119 if (entry->domain == NULL)
120 goto cfg_unlbl_map_add_failure;
121 }
122
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);
127 if (addrmap == NULL)
128 goto cfg_unlbl_map_add_failure;
129 INIT_LIST_HEAD(&addrmap->list4);
130 INIT_LIST_HEAD(&addrmap->list6);
131
132 switch (family) {
133 case AF_INET: {
134 const struct in_addr *addr4 = addr;
135 const struct in_addr *mask4 = mask;
136 map4 = kzalloc(sizeof(*map4), GFP_ATOMIC);
137 if (map4 == NULL)
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,
144 &addrmap->list4);
145 if (ret_val != 0)
146 goto cfg_unlbl_map_add_failure;
147 break;
148 }
149#if IS_ENABLED(CONFIG_IPV6)
150 case AF_INET6: {
151 const struct in6_addr *addr6 = addr;
152 const struct in6_addr *mask6 = mask;
153 map6 = kzalloc(sizeof(*map6), GFP_ATOMIC);
154 if (map6 == NULL)
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,
165 &addrmap->list6);
166 if (ret_val != 0)
167 goto cfg_unlbl_map_add_failure;
168 break;
169 }
170#endif /* IPv6 */
171 default:
172 goto cfg_unlbl_map_add_failure;
173 }
174
175 entry->def.addrsel = addrmap;
176 entry->def.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#if IS_ENABLED(CONFIG_IPV6)
229 case AF_INET6:
230 addr_len = sizeof(struct in6_addr);
231 break;
232#endif /* IPv6 */
233 default:
234 return -EPFNOSUPPORT;
235 }
236
237 return netlbl_unlhsh_add(net,
238 dev_name, addr, mask, addr_len,
239 secid, audit_info);
240}
241
242/**
243 * netlbl_cfg_unlbl_static_del - Removes an existing static label
244 * @net: network namespace
245 * @dev_name: interface name
246 * @addr: IP address in network byte order (struct in[6]_addr)
247 * @mask: address mask in network byte order (struct in[6]_addr)
248 * @family: address family
249 * @audit_info: NetLabel audit information
250 *
251 * Description:
252 * Removes an existing NetLabel static label used when protocol provided labels
253 * are not present on incoming traffic. If @dev_name is NULL then the default
254 * interface will be used. Returns zero on success, negative values on failure.
255 *
256 */
257int netlbl_cfg_unlbl_static_del(struct net *net,
258 const char *dev_name,
259 const void *addr,
260 const void *mask,
261 u16 family,
262 struct netlbl_audit *audit_info)
263{
264 u32 addr_len;
265
266 switch (family) {
267 case AF_INET:
268 addr_len = sizeof(struct in_addr);
269 break;
270#if IS_ENABLED(CONFIG_IPV6)
271 case AF_INET6:
272 addr_len = sizeof(struct in6_addr);
273 break;
274#endif /* IPv6 */
275 default:
276 return -EPFNOSUPPORT;
277 }
278
279 return netlbl_unlhsh_remove(net,
280 dev_name, addr, mask, addr_len,
281 audit_info);
282}
283
284/**
285 * netlbl_cfg_cipsov4_add - Add a new CIPSOv4 DOI definition
286 * @doi_def: CIPSO DOI definition
287 * @audit_info: NetLabel audit information
288 *
289 * Description:
290 * Add a new CIPSO DOI definition as defined by @doi_def. Returns zero on
291 * success and negative values on failure.
292 *
293 */
294int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def,
295 struct netlbl_audit *audit_info)
296{
297 return cipso_v4_doi_add(doi_def, audit_info);
298}
299
300/**
301 * netlbl_cfg_cipsov4_del - Remove an existing CIPSOv4 DOI definition
302 * @doi: CIPSO DOI
303 * @audit_info: NetLabel audit information
304 *
305 * Description:
306 * Remove an existing CIPSO DOI definition matching @doi. Returns zero on
307 * success and negative values on failure.
308 *
309 */
310void netlbl_cfg_cipsov4_del(u32 doi, struct netlbl_audit *audit_info)
311{
312 cipso_v4_doi_remove(doi, audit_info);
313}
314
315/**
316 * netlbl_cfg_cipsov4_map_add - Add a new CIPSOv4 DOI mapping
317 * @doi: the CIPSO DOI
318 * @domain: the domain mapping to add
319 * @addr: IP address
320 * @mask: IP address mask
321 * @audit_info: NetLabel audit information
322 *
323 * Description:
324 * Add a new NetLabel/LSM domain mapping for the given CIPSO DOI to the NetLabel
325 * subsystem. A @domain value of NULL adds a new default domain mapping.
326 * Returns zero on success, negative values on failure.
327 *
328 */
329int netlbl_cfg_cipsov4_map_add(u32 doi,
330 const char *domain,
331 const struct in_addr *addr,
332 const struct in_addr *mask,
333 struct netlbl_audit *audit_info)
334{
335 int ret_val = -ENOMEM;
336 struct cipso_v4_doi *doi_def;
337 struct netlbl_dom_map *entry;
338 struct netlbl_domaddr_map *addrmap = NULL;
339 struct netlbl_domaddr4_map *addrinfo = NULL;
340
341 doi_def = cipso_v4_doi_getdef(doi);
342 if (doi_def == NULL)
343 return -ENOENT;
344
345 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
346 if (entry == NULL)
347 goto out_entry;
348 if (domain != NULL) {
349 entry->domain = kstrdup(domain, GFP_ATOMIC);
350 if (entry->domain == NULL)
351 goto out_domain;
352 }
353
354 if (addr == NULL && mask == NULL) {
355 entry->def.cipso = doi_def;
356 entry->def.type = NETLBL_NLTYPE_CIPSOV4;
357 } else if (addr != NULL && mask != NULL) {
358 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
359 if (addrmap == NULL)
360 goto out_addrmap;
361 INIT_LIST_HEAD(&addrmap->list4);
362 INIT_LIST_HEAD(&addrmap->list6);
363
364 addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC);
365 if (addrinfo == NULL)
366 goto out_addrinfo;
367 addrinfo->def.cipso = doi_def;
368 addrinfo->def.type = NETLBL_NLTYPE_CIPSOV4;
369 addrinfo->list.addr = addr->s_addr & mask->s_addr;
370 addrinfo->list.mask = mask->s_addr;
371 addrinfo->list.valid = 1;
372 ret_val = netlbl_af4list_add(&addrinfo->list, &addrmap->list4);
373 if (ret_val != 0)
374 goto cfg_cipsov4_map_add_failure;
375
376 entry->def.addrsel = addrmap;
377 entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
378 } else {
379 ret_val = -EINVAL;
380 goto out_addrmap;
381 }
382
383 ret_val = netlbl_domhsh_add(entry, audit_info);
384 if (ret_val != 0)
385 goto cfg_cipsov4_map_add_failure;
386
387 return 0;
388
389cfg_cipsov4_map_add_failure:
390 kfree(addrinfo);
391out_addrinfo:
392 kfree(addrmap);
393out_addrmap:
394 kfree(entry->domain);
395out_domain:
396 kfree(entry);
397out_entry:
398 cipso_v4_doi_putdef(doi_def);
399 return ret_val;
400}
401
402/*
403 * Security Attribute Functions
404 */
405
406#define _CM_F_NONE 0x00000000
407#define _CM_F_ALLOC 0x00000001
408#define _CM_F_WALK 0x00000002
409
410/**
411 * _netlbl_catmap_getnode - Get a individual node from a catmap
412 * @catmap: pointer to the category bitmap
413 * @offset: the requested offset
414 * @cm_flags: catmap flags, see _CM_F_*
415 * @gfp_flags: memory allocation flags
416 *
417 * Description:
418 * Iterate through the catmap looking for the node associated with @offset.
419 * If the _CM_F_ALLOC flag is set in @cm_flags and there is no associated node,
420 * one will be created and inserted into the catmap. If the _CM_F_WALK flag is
421 * set in @cm_flags and there is no associated node, the next highest node will
422 * be returned. Returns a pointer to the node on success, NULL on failure.
423 *
424 */
425static struct netlbl_lsm_catmap *_netlbl_catmap_getnode(
426 struct netlbl_lsm_catmap **catmap,
427 u32 offset,
428 unsigned int cm_flags,
429 gfp_t gfp_flags)
430{
431 struct netlbl_lsm_catmap *iter = *catmap;
432 struct netlbl_lsm_catmap *prev = NULL;
433
434 if (iter == NULL)
435 goto catmap_getnode_alloc;
436 if (offset < iter->startbit)
437 goto catmap_getnode_walk;
438 while (iter && offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
439 prev = iter;
440 iter = iter->next;
441 }
442 if (iter == NULL || offset < iter->startbit)
443 goto catmap_getnode_walk;
444
445 return iter;
446
447catmap_getnode_walk:
448 if (cm_flags & _CM_F_WALK)
449 return iter;
450catmap_getnode_alloc:
451 if (!(cm_flags & _CM_F_ALLOC))
452 return NULL;
453
454 iter = netlbl_catmap_alloc(gfp_flags);
455 if (iter == NULL)
456 return NULL;
457 iter->startbit = offset & ~(NETLBL_CATMAP_SIZE - 1);
458
459 if (prev == NULL) {
460 iter->next = *catmap;
461 *catmap = iter;
462 } else {
463 iter->next = prev->next;
464 prev->next = iter;
465 }
466
467 return iter;
468}
469
470/**
471 * netlbl_catmap_walk - Walk a LSM secattr catmap looking for a bit
472 * @catmap: the category bitmap
473 * @offset: the offset to start searching at, in bits
474 *
475 * Description:
476 * This function walks a LSM secattr category bitmap starting at @offset and
477 * returns the spot of the first set bit or -ENOENT if no bits are set.
478 *
479 */
480int netlbl_catmap_walk(struct netlbl_lsm_catmap *catmap, u32 offset)
481{
482 struct netlbl_lsm_catmap *iter = catmap;
483 u32 idx;
484 u32 bit;
485 NETLBL_CATMAP_MAPTYPE bitmap;
486
487 iter = _netlbl_catmap_getnode(&catmap, offset, _CM_F_WALK, 0);
488 if (iter == NULL)
489 return -ENOENT;
490 if (offset > iter->startbit) {
491 offset -= iter->startbit;
492 idx = offset / NETLBL_CATMAP_MAPSIZE;
493 bit = offset % NETLBL_CATMAP_MAPSIZE;
494 } else {
495 idx = 0;
496 bit = 0;
497 }
498 bitmap = iter->bitmap[idx] >> bit;
499
500 for (;;) {
501 if (bitmap != 0) {
502 while ((bitmap & NETLBL_CATMAP_BIT) == 0) {
503 bitmap >>= 1;
504 bit++;
505 }
506 return iter->startbit +
507 (NETLBL_CATMAP_MAPSIZE * idx) + bit;
508 }
509 if (++idx >= NETLBL_CATMAP_MAPCNT) {
510 if (iter->next != NULL) {
511 iter = iter->next;
512 idx = 0;
513 } else
514 return -ENOENT;
515 }
516 bitmap = iter->bitmap[idx];
517 bit = 0;
518 }
519
520 return -ENOENT;
521}
522
523/**
524 * netlbl_catmap_walkrng - Find the end of a string of set bits
525 * @catmap: the category bitmap
526 * @offset: the offset to start searching at, in bits
527 *
528 * Description:
529 * This function walks a LSM secattr category bitmap starting at @offset and
530 * returns the spot of the first cleared bit or -ENOENT if the offset is past
531 * the end of the bitmap.
532 *
533 */
534int netlbl_catmap_walkrng(struct netlbl_lsm_catmap *catmap, u32 offset)
535{
536 struct netlbl_lsm_catmap *iter;
537 struct netlbl_lsm_catmap *prev = NULL;
538 u32 idx;
539 u32 bit;
540 NETLBL_CATMAP_MAPTYPE bitmask;
541 NETLBL_CATMAP_MAPTYPE bitmap;
542
543 iter = _netlbl_catmap_getnode(&catmap, offset, _CM_F_WALK, 0);
544 if (iter == NULL)
545 return -ENOENT;
546 if (offset > iter->startbit) {
547 offset -= iter->startbit;
548 idx = offset / NETLBL_CATMAP_MAPSIZE;
549 bit = offset % NETLBL_CATMAP_MAPSIZE;
550 } else {
551 idx = 0;
552 bit = 0;
553 }
554 bitmask = NETLBL_CATMAP_BIT << bit;
555
556 for (;;) {
557 bitmap = iter->bitmap[idx];
558 while (bitmask != 0 && (bitmap & bitmask) != 0) {
559 bitmask <<= 1;
560 bit++;
561 }
562
563 if (prev && idx == 0 && bit == 0)
564 return prev->startbit + NETLBL_CATMAP_SIZE - 1;
565 else if (bitmask != 0)
566 return iter->startbit +
567 (NETLBL_CATMAP_MAPSIZE * idx) + bit - 1;
568 else if (++idx >= NETLBL_CATMAP_MAPCNT) {
569 if (iter->next == NULL)
570 return iter->startbit + NETLBL_CATMAP_SIZE - 1;
571 prev = iter;
572 iter = iter->next;
573 idx = 0;
574 }
575 bitmask = NETLBL_CATMAP_BIT;
576 bit = 0;
577 }
578
579 return -ENOENT;
580}
581
582/**
583 * netlbl_catmap_getlong - Export an unsigned long bitmap
584 * @catmap: pointer to the category bitmap
585 * @offset: pointer to the requested offset
586 * @bitmap: the exported bitmap
587 *
588 * Description:
589 * Export a bitmap with an offset greater than or equal to @offset and return
590 * it in @bitmap. The @offset must be aligned to an unsigned long and will be
591 * updated on return if different from what was requested; if the catmap is
592 * empty at the requested offset and beyond, the @offset is set to (u32)-1.
593 * Returns zero on sucess, negative values on failure.
594 *
595 */
596int netlbl_catmap_getlong(struct netlbl_lsm_catmap *catmap,
597 u32 *offset,
598 unsigned long *bitmap)
599{
600 struct netlbl_lsm_catmap *iter;
601 u32 off = *offset;
602 u32 idx;
603
604 /* only allow aligned offsets */
605 if ((off & (BITS_PER_LONG - 1)) != 0)
606 return -EINVAL;
607
608 if (off < catmap->startbit) {
609 off = catmap->startbit;
610 *offset = off;
611 }
612 iter = _netlbl_catmap_getnode(&catmap, off, _CM_F_NONE, 0);
613 if (iter == NULL) {
614 *offset = (u32)-1;
615 return 0;
616 }
617
618 if (off < iter->startbit) {
619 off = iter->startbit;
620 *offset = off;
621 } else
622 off -= iter->startbit;
623
624 idx = off / NETLBL_CATMAP_MAPSIZE;
625 *bitmap = iter->bitmap[idx] >> (off % NETLBL_CATMAP_SIZE);
626
627 return 0;
628}
629
630/**
631 * netlbl_catmap_setbit - Set a bit in a LSM secattr catmap
632 * @catmap: pointer to the category bitmap
633 * @bit: the bit to set
634 * @flags: memory allocation flags
635 *
636 * Description:
637 * Set the bit specified by @bit in @catmap. Returns zero on success,
638 * negative values on failure.
639 *
640 */
641int netlbl_catmap_setbit(struct netlbl_lsm_catmap **catmap,
642 u32 bit,
643 gfp_t flags)
644{
645 struct netlbl_lsm_catmap *iter;
646 u32 idx;
647
648 iter = _netlbl_catmap_getnode(catmap, bit, _CM_F_ALLOC, flags);
649 if (iter == NULL)
650 return -ENOMEM;
651
652 bit -= iter->startbit;
653 idx = bit / NETLBL_CATMAP_MAPSIZE;
654 iter->bitmap[idx] |= NETLBL_CATMAP_BIT << (bit % NETLBL_CATMAP_MAPSIZE);
655
656 return 0;
657}
658
659/**
660 * netlbl_catmap_setrng - Set a range of bits in a LSM secattr catmap
661 * @catmap: pointer to the category bitmap
662 * @start: the starting bit
663 * @end: the last bit in the string
664 * @flags: memory allocation flags
665 *
666 * Description:
667 * Set a range of bits, starting at @start and ending with @end. Returns zero
668 * on success, negative values on failure.
669 *
670 */
671int netlbl_catmap_setrng(struct netlbl_lsm_catmap **catmap,
672 u32 start,
673 u32 end,
674 gfp_t flags)
675{
676 int rc = 0;
677 u32 spot = start;
678
679 while (rc == 0 && spot <= end) {
680 if (((spot & (BITS_PER_LONG - 1)) != 0) &&
681 ((end - spot) > BITS_PER_LONG)) {
682 rc = netlbl_catmap_setlong(catmap,
683 spot,
684 (unsigned long)-1,
685 flags);
686 spot += BITS_PER_LONG;
687 } else
688 rc = netlbl_catmap_setbit(catmap, spot++, flags);
689 }
690
691 return rc;
692}
693
694/**
695 * netlbl_catmap_setlong - Import an unsigned long bitmap
696 * @catmap: pointer to the category bitmap
697 * @offset: offset to the start of the imported bitmap
698 * @bitmap: the bitmap to import
699 * @flags: memory allocation flags
700 *
701 * Description:
702 * Import the bitmap specified in @bitmap into @catmap, using the offset
703 * in @offset. The offset must be aligned to an unsigned long. Returns zero
704 * on success, negative values on failure.
705 *
706 */
707int netlbl_catmap_setlong(struct netlbl_lsm_catmap **catmap,
708 u32 offset,
709 unsigned long bitmap,
710 gfp_t flags)
711{
712 struct netlbl_lsm_catmap *iter;
713 u32 idx;
714
715 /* only allow aligned offsets */
716 if ((offset & (BITS_PER_LONG - 1)) != 0)
717 return -EINVAL;
718
719 iter = _netlbl_catmap_getnode(catmap, offset, _CM_F_ALLOC, flags);
720 if (iter == NULL)
721 return -ENOMEM;
722
723 offset -= iter->startbit;
724 idx = offset / NETLBL_CATMAP_MAPSIZE;
725 iter->bitmap[idx] |= bitmap << (offset % NETLBL_CATMAP_MAPSIZE);
726
727 return 0;
728}
729
730/*
731 * LSM Functions
732 */
733
734/**
735 * netlbl_enabled - Determine if the NetLabel subsystem is enabled
736 *
737 * Description:
738 * The LSM can use this function to determine if it should use NetLabel
739 * security attributes in it's enforcement mechanism. Currently, NetLabel is
740 * considered to be enabled when it's configuration contains a valid setup for
741 * at least one labeled protocol (i.e. NetLabel can understand incoming
742 * labeled packets of at least one type); otherwise NetLabel is considered to
743 * be disabled.
744 *
745 */
746int netlbl_enabled(void)
747{
748 /* At some point we probably want to expose this mechanism to the user
749 * as well so that admins can toggle NetLabel regardless of the
750 * configuration */
751 return (atomic_read(&netlabel_mgmt_protocount) > 0);
752}
753
754/**
755 * netlbl_sock_setattr - Label a socket using the correct protocol
756 * @sk: the socket to label
757 * @family: protocol family
758 * @secattr: the security attributes
759 *
760 * Description:
761 * Attach the correct label to the given socket using the security attributes
762 * specified in @secattr. This function requires exclusive access to @sk,
763 * which means it either needs to be in the process of being created or locked.
764 * Returns zero on success, -EDESTADDRREQ if the domain is configured to use
765 * network address selectors (can't blindly label the socket), and negative
766 * values on all other failures.
767 *
768 */
769int netlbl_sock_setattr(struct sock *sk,
770 u16 family,
771 const struct netlbl_lsm_secattr *secattr)
772{
773 int ret_val;
774 struct netlbl_dom_map *dom_entry;
775
776 rcu_read_lock();
777 dom_entry = netlbl_domhsh_getentry(secattr->domain);
778 if (dom_entry == NULL) {
779 ret_val = -ENOENT;
780 goto socket_setattr_return;
781 }
782 switch (family) {
783 case AF_INET:
784 switch (dom_entry->def.type) {
785 case NETLBL_NLTYPE_ADDRSELECT:
786 ret_val = -EDESTADDRREQ;
787 break;
788 case NETLBL_NLTYPE_CIPSOV4:
789 ret_val = cipso_v4_sock_setattr(sk,
790 dom_entry->def.cipso,
791 secattr);
792 break;
793 case NETLBL_NLTYPE_UNLABELED:
794 ret_val = 0;
795 break;
796 default:
797 ret_val = -ENOENT;
798 }
799 break;
800#if IS_ENABLED(CONFIG_IPV6)
801 case AF_INET6:
802 /* since we don't support any IPv6 labeling protocols right
803 * now we can optimize everything away until we do */
804 ret_val = 0;
805 break;
806#endif /* IPv6 */
807 default:
808 ret_val = -EPROTONOSUPPORT;
809 }
810
811socket_setattr_return:
812 rcu_read_unlock();
813 return ret_val;
814}
815
816/**
817 * netlbl_sock_delattr - Delete all the NetLabel labels on a socket
818 * @sk: the socket
819 *
820 * Description:
821 * Remove all the NetLabel labeling from @sk. The caller is responsible for
822 * ensuring that @sk is locked.
823 *
824 */
825void netlbl_sock_delattr(struct sock *sk)
826{
827 cipso_v4_sock_delattr(sk);
828}
829
830/**
831 * netlbl_sock_getattr - Determine the security attributes of a sock
832 * @sk: the sock
833 * @secattr: the security attributes
834 *
835 * Description:
836 * Examines the given sock to see if any NetLabel style labeling has been
837 * applied to the sock, if so it parses the socket label and returns the
838 * security attributes in @secattr. Returns zero on success, negative values
839 * on failure.
840 *
841 */
842int netlbl_sock_getattr(struct sock *sk,
843 struct netlbl_lsm_secattr *secattr)
844{
845 int ret_val;
846
847 switch (sk->sk_family) {
848 case AF_INET:
849 ret_val = cipso_v4_sock_getattr(sk, secattr);
850 break;
851#if IS_ENABLED(CONFIG_IPV6)
852 case AF_INET6:
853 ret_val = -ENOMSG;
854 break;
855#endif /* IPv6 */
856 default:
857 ret_val = -EPROTONOSUPPORT;
858 }
859
860 return ret_val;
861}
862
863/**
864 * netlbl_conn_setattr - Label a connected socket using the correct protocol
865 * @sk: the socket to label
866 * @addr: the destination address
867 * @secattr: the security attributes
868 *
869 * Description:
870 * Attach the correct label to the given connected socket using the security
871 * attributes specified in @secattr. The caller is responsible for ensuring
872 * that @sk is locked. Returns zero on success, negative values on failure.
873 *
874 */
875int netlbl_conn_setattr(struct sock *sk,
876 struct sockaddr *addr,
877 const struct netlbl_lsm_secattr *secattr)
878{
879 int ret_val;
880 struct sockaddr_in *addr4;
881 struct netlbl_dommap_def *entry;
882
883 rcu_read_lock();
884 switch (addr->sa_family) {
885 case AF_INET:
886 addr4 = (struct sockaddr_in *)addr;
887 entry = netlbl_domhsh_getentry_af4(secattr->domain,
888 addr4->sin_addr.s_addr);
889 if (entry == NULL) {
890 ret_val = -ENOENT;
891 goto conn_setattr_return;
892 }
893 switch (entry->type) {
894 case NETLBL_NLTYPE_CIPSOV4:
895 ret_val = cipso_v4_sock_setattr(sk,
896 entry->cipso, secattr);
897 break;
898 case NETLBL_NLTYPE_UNLABELED:
899 /* just delete the protocols we support for right now
900 * but we could remove other protocols if needed */
901 cipso_v4_sock_delattr(sk);
902 ret_val = 0;
903 break;
904 default:
905 ret_val = -ENOENT;
906 }
907 break;
908#if IS_ENABLED(CONFIG_IPV6)
909 case AF_INET6:
910 /* since we don't support any IPv6 labeling protocols right
911 * now we can optimize everything away until we do */
912 ret_val = 0;
913 break;
914#endif /* IPv6 */
915 default:
916 ret_val = -EPROTONOSUPPORT;
917 }
918
919conn_setattr_return:
920 rcu_read_unlock();
921 return ret_val;
922}
923
924/**
925 * netlbl_req_setattr - Label a request socket using the correct protocol
926 * @req: the request socket to label
927 * @secattr: the security attributes
928 *
929 * Description:
930 * Attach the correct label to the given socket using the security attributes
931 * specified in @secattr. Returns zero on success, negative values on failure.
932 *
933 */
934int netlbl_req_setattr(struct request_sock *req,
935 const struct netlbl_lsm_secattr *secattr)
936{
937 int ret_val;
938 struct netlbl_dommap_def *entry;
939
940 rcu_read_lock();
941 switch (req->rsk_ops->family) {
942 case AF_INET:
943 entry = netlbl_domhsh_getentry_af4(secattr->domain,
944 inet_rsk(req)->ir_rmt_addr);
945 if (entry == NULL) {
946 ret_val = -ENOENT;
947 goto req_setattr_return;
948 }
949 switch (entry->type) {
950 case NETLBL_NLTYPE_CIPSOV4:
951 ret_val = cipso_v4_req_setattr(req,
952 entry->cipso, secattr);
953 break;
954 case NETLBL_NLTYPE_UNLABELED:
955 /* just delete the protocols we support for right now
956 * but we could remove other protocols if needed */
957 cipso_v4_req_delattr(req);
958 ret_val = 0;
959 break;
960 default:
961 ret_val = -ENOENT;
962 }
963 break;
964#if IS_ENABLED(CONFIG_IPV6)
965 case AF_INET6:
966 /* since we don't support any IPv6 labeling protocols right
967 * now we can optimize everything away until we do */
968 ret_val = 0;
969 break;
970#endif /* IPv6 */
971 default:
972 ret_val = -EPROTONOSUPPORT;
973 }
974
975req_setattr_return:
976 rcu_read_unlock();
977 return ret_val;
978}
979
980/**
981* netlbl_req_delattr - Delete all the NetLabel labels on a socket
982* @req: the socket
983*
984* Description:
985* Remove all the NetLabel labeling from @req.
986*
987*/
988void netlbl_req_delattr(struct request_sock *req)
989{
990 cipso_v4_req_delattr(req);
991}
992
993/**
994 * netlbl_skbuff_setattr - Label a packet using the correct protocol
995 * @skb: the packet
996 * @family: protocol family
997 * @secattr: the security attributes
998 *
999 * Description:
1000 * Attach the correct label to the given packet using the security attributes
1001 * specified in @secattr. Returns zero on success, negative values on failure.
1002 *
1003 */
1004int netlbl_skbuff_setattr(struct sk_buff *skb,
1005 u16 family,
1006 const struct netlbl_lsm_secattr *secattr)
1007{
1008 int ret_val;
1009 struct iphdr *hdr4;
1010 struct netlbl_dommap_def *entry;
1011
1012 rcu_read_lock();
1013 switch (family) {
1014 case AF_INET:
1015 hdr4 = ip_hdr(skb);
1016 entry = netlbl_domhsh_getentry_af4(secattr->domain,hdr4->daddr);
1017 if (entry == NULL) {
1018 ret_val = -ENOENT;
1019 goto skbuff_setattr_return;
1020 }
1021 switch (entry->type) {
1022 case NETLBL_NLTYPE_CIPSOV4:
1023 ret_val = cipso_v4_skbuff_setattr(skb, entry->cipso,
1024 secattr);
1025 break;
1026 case NETLBL_NLTYPE_UNLABELED:
1027 /* just delete the protocols we support for right now
1028 * but we could remove other protocols if needed */
1029 ret_val = cipso_v4_skbuff_delattr(skb);
1030 break;
1031 default:
1032 ret_val = -ENOENT;
1033 }
1034 break;
1035#if IS_ENABLED(CONFIG_IPV6)
1036 case AF_INET6:
1037 /* since we don't support any IPv6 labeling protocols right
1038 * now we can optimize everything away until we do */
1039 ret_val = 0;
1040 break;
1041#endif /* IPv6 */
1042 default:
1043 ret_val = -EPROTONOSUPPORT;
1044 }
1045
1046skbuff_setattr_return:
1047 rcu_read_unlock();
1048 return ret_val;
1049}
1050
1051/**
1052 * netlbl_skbuff_getattr - Determine the security attributes of a packet
1053 * @skb: the packet
1054 * @family: protocol family
1055 * @secattr: the security attributes
1056 *
1057 * Description:
1058 * Examines the given packet to see if a recognized form of packet labeling
1059 * is present, if so it parses the packet label and returns the security
1060 * attributes in @secattr. Returns zero on success, negative values on
1061 * failure.
1062 *
1063 */
1064int netlbl_skbuff_getattr(const struct sk_buff *skb,
1065 u16 family,
1066 struct netlbl_lsm_secattr *secattr)
1067{
1068 unsigned char *ptr;
1069
1070 switch (family) {
1071 case AF_INET:
1072 ptr = cipso_v4_optptr(skb);
1073 if (ptr && cipso_v4_getattr(ptr, secattr) == 0)
1074 return 0;
1075 break;
1076#if IS_ENABLED(CONFIG_IPV6)
1077 case AF_INET6:
1078 break;
1079#endif /* IPv6 */
1080 }
1081
1082 return netlbl_unlabel_getattr(skb, family, secattr);
1083}
1084
1085/**
1086 * netlbl_skbuff_err - Handle a LSM error on a sk_buff
1087 * @skb: the packet
1088 * @error: the error code
1089 * @gateway: true if host is acting as a gateway, false otherwise
1090 *
1091 * Description:
1092 * Deal with a LSM problem when handling the packet in @skb, typically this is
1093 * a permission denied problem (-EACCES). The correct action is determined
1094 * according to the packet's labeling protocol.
1095 *
1096 */
1097void netlbl_skbuff_err(struct sk_buff *skb, int error, int gateway)
1098{
1099 if (cipso_v4_optptr(skb))
1100 cipso_v4_error(skb, error, gateway);
1101}
1102
1103/**
1104 * netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches
1105 *
1106 * Description:
1107 * For all of the NetLabel protocols that support some form of label mapping
1108 * cache, invalidate the cache. Returns zero on success, negative values on
1109 * error.
1110 *
1111 */
1112void netlbl_cache_invalidate(void)
1113{
1114 cipso_v4_cache_invalidate();
1115}
1116
1117/**
1118 * netlbl_cache_add - Add an entry to a NetLabel protocol cache
1119 * @skb: the packet
1120 * @secattr: the packet's security attributes
1121 *
1122 * Description:
1123 * Add the LSM security attributes for the given packet to the underlying
1124 * NetLabel protocol's label mapping cache. Returns zero on success, negative
1125 * values on error.
1126 *
1127 */
1128int netlbl_cache_add(const struct sk_buff *skb,
1129 const struct netlbl_lsm_secattr *secattr)
1130{
1131 unsigned char *ptr;
1132
1133 if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0)
1134 return -ENOMSG;
1135
1136 ptr = cipso_v4_optptr(skb);
1137 if (ptr)
1138 return cipso_v4_cache_add(ptr, secattr);
1139
1140 return -ENOMSG;
1141}
1142
1143/*
1144 * Protocol Engine Functions
1145 */
1146
1147/**
1148 * netlbl_audit_start - Start an audit message
1149 * @type: audit message type
1150 * @audit_info: NetLabel audit information
1151 *
1152 * Description:
1153 * Start an audit message using the type specified in @type and fill the audit
1154 * message with some fields common to all NetLabel audit messages. This
1155 * function should only be used by protocol engines, not LSMs. Returns a
1156 * pointer to the audit buffer on success, NULL on failure.
1157 *
1158 */
1159struct audit_buffer *netlbl_audit_start(int type,
1160 struct netlbl_audit *audit_info)
1161{
1162 return netlbl_audit_start_common(type, audit_info);
1163}
1164
1165/*
1166 * Setup Functions
1167 */
1168
1169/**
1170 * netlbl_init - Initialize NetLabel
1171 *
1172 * Description:
1173 * Perform the required NetLabel initialization before first use.
1174 *
1175 */
1176static int __init netlbl_init(void)
1177{
1178 int ret_val;
1179
1180 printk(KERN_INFO "NetLabel: Initializing\n");
1181 printk(KERN_INFO "NetLabel: domain hash size = %u\n",
1182 (1 << NETLBL_DOMHSH_BITSIZE));
1183 printk(KERN_INFO "NetLabel: protocols ="
1184 " UNLABELED"
1185 " CIPSOv4"
1186 "\n");
1187
1188 ret_val = netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE);
1189 if (ret_val != 0)
1190 goto init_failure;
1191
1192 ret_val = netlbl_unlabel_init(NETLBL_UNLHSH_BITSIZE);
1193 if (ret_val != 0)
1194 goto init_failure;
1195
1196 ret_val = netlbl_netlink_init();
1197 if (ret_val != 0)
1198 goto init_failure;
1199
1200 ret_val = netlbl_unlabel_defconf();
1201 if (ret_val != 0)
1202 goto init_failure;
1203 printk(KERN_INFO "NetLabel: unlabeled traffic allowed by default\n");
1204
1205 return 0;
1206
1207init_failure:
1208 panic("NetLabel: failed to initialize properly (%d)\n", ret_val);
1209}
1210
1211subsys_initcall(netlbl_init);