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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// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * NetLabel Kernel API
4 *
5 * This file defines the kernel API for the NetLabel system. The NetLabel
6 * system manages static and dynamic label mappings for network protocols such
7 * as CIPSO and RIPSO.
8 *
9 * Author: Paul Moore <paul@paul-moore.com>
10 */
11
12/*
13 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008
14 */
15
16#include <linux/init.h>
17#include <linux/types.h>
18#include <linux/slab.h>
19#include <linux/audit.h>
20#include <linux/in.h>
21#include <linux/in6.h>
22#include <net/ip.h>
23#include <net/ipv6.h>
24#include <net/netlabel.h>
25#include <net/cipso_ipv4.h>
26#include <net/calipso.h>
27#include <asm/bug.h>
28#include <linux/atomic.h>
29
30#include "netlabel_domainhash.h"
31#include "netlabel_unlabeled.h"
32#include "netlabel_cipso_v4.h"
33#include "netlabel_calipso.h"
34#include "netlabel_user.h"
35#include "netlabel_mgmt.h"
36#include "netlabel_addrlist.h"
37
38/*
39 * Configuration Functions
40 */
41
42/**
43 * netlbl_cfg_map_del - Remove a NetLabel/LSM domain mapping
44 * @domain: the domain mapping to remove
45 * @family: address family
46 * @addr: IP address
47 * @mask: IP address mask
48 * @audit_info: NetLabel audit information
49 *
50 * Description:
51 * Removes a NetLabel/LSM domain mapping. A @domain value of NULL causes the
52 * default domain mapping to be removed. Returns zero on success, negative
53 * values on failure.
54 *
55 */
56int netlbl_cfg_map_del(const char *domain,
57 u16 family,
58 const void *addr,
59 const void *mask,
60 struct netlbl_audit *audit_info)
61{
62 if (addr == NULL && mask == NULL) {
63 return netlbl_domhsh_remove(domain, family, audit_info);
64 } else if (addr != NULL && mask != NULL) {
65 switch (family) {
66 case AF_INET:
67 return netlbl_domhsh_remove_af4(domain, addr, mask,
68 audit_info);
69#if IS_ENABLED(CONFIG_IPV6)
70 case AF_INET6:
71 return netlbl_domhsh_remove_af6(domain, addr, mask,
72 audit_info);
73#endif /* IPv6 */
74 default:
75 return -EPFNOSUPPORT;
76 }
77 } else
78 return -EINVAL;
79}
80
81/**
82 * netlbl_cfg_unlbl_map_add - Add a new unlabeled mapping
83 * @domain: the domain mapping to add
84 * @family: address family
85 * @addr: IP address
86 * @mask: IP address mask
87 * @audit_info: NetLabel audit information
88 *
89 * Description:
90 * Adds a new unlabeled NetLabel/LSM domain mapping. A @domain value of NULL
91 * causes a new default domain mapping to be added. Returns zero on success,
92 * negative values on failure.
93 *
94 */
95int netlbl_cfg_unlbl_map_add(const char *domain,
96 u16 family,
97 const void *addr,
98 const void *mask,
99 struct netlbl_audit *audit_info)
100{
101 int ret_val = -ENOMEM;
102 struct netlbl_dom_map *entry;
103 struct netlbl_domaddr_map *addrmap = NULL;
104 struct netlbl_domaddr4_map *map4 = NULL;
105 struct netlbl_domaddr6_map *map6 = NULL;
106
107 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
108 if (entry == NULL)
109 return -ENOMEM;
110 if (domain != NULL) {
111 entry->domain = kstrdup(domain, GFP_ATOMIC);
112 if (entry->domain == NULL)
113 goto cfg_unlbl_map_add_failure;
114 }
115 entry->family = family;
116
117 if (addr == NULL && mask == NULL)
118 entry->def.type = NETLBL_NLTYPE_UNLABELED;
119 else if (addr != NULL && mask != NULL) {
120 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
121 if (addrmap == NULL)
122 goto cfg_unlbl_map_add_failure;
123 INIT_LIST_HEAD(&addrmap->list4);
124 INIT_LIST_HEAD(&addrmap->list6);
125
126 switch (family) {
127 case AF_INET: {
128 const struct in_addr *addr4 = addr;
129 const struct in_addr *mask4 = mask;
130 map4 = kzalloc(sizeof(*map4), GFP_ATOMIC);
131 if (map4 == NULL)
132 goto cfg_unlbl_map_add_failure;
133 map4->def.type = NETLBL_NLTYPE_UNLABELED;
134 map4->list.addr = addr4->s_addr & mask4->s_addr;
135 map4->list.mask = mask4->s_addr;
136 map4->list.valid = 1;
137 ret_val = netlbl_af4list_add(&map4->list,
138 &addrmap->list4);
139 if (ret_val != 0)
140 goto cfg_unlbl_map_add_failure;
141 break;
142 }
143#if IS_ENABLED(CONFIG_IPV6)
144 case AF_INET6: {
145 const struct in6_addr *addr6 = addr;
146 const struct in6_addr *mask6 = mask;
147 map6 = kzalloc(sizeof(*map6), GFP_ATOMIC);
148 if (map6 == NULL)
149 goto cfg_unlbl_map_add_failure;
150 map6->def.type = NETLBL_NLTYPE_UNLABELED;
151 map6->list.addr = *addr6;
152 map6->list.addr.s6_addr32[0] &= mask6->s6_addr32[0];
153 map6->list.addr.s6_addr32[1] &= mask6->s6_addr32[1];
154 map6->list.addr.s6_addr32[2] &= mask6->s6_addr32[2];
155 map6->list.addr.s6_addr32[3] &= mask6->s6_addr32[3];
156 map6->list.mask = *mask6;
157 map6->list.valid = 1;
158 ret_val = netlbl_af6list_add(&map6->list,
159 &addrmap->list6);
160 if (ret_val != 0)
161 goto cfg_unlbl_map_add_failure;
162 break;
163 }
164#endif /* IPv6 */
165 default:
166 goto cfg_unlbl_map_add_failure;
167 }
168
169 entry->def.addrsel = addrmap;
170 entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
171 } else {
172 ret_val = -EINVAL;
173 goto cfg_unlbl_map_add_failure;
174 }
175
176 ret_val = netlbl_domhsh_add(entry, audit_info);
177 if (ret_val != 0)
178 goto cfg_unlbl_map_add_failure;
179
180 return 0;
181
182cfg_unlbl_map_add_failure:
183 kfree(entry->domain);
184 kfree(entry);
185 kfree(addrmap);
186 kfree(map4);
187 kfree(map6);
188 return ret_val;
189}
190
191
192/**
193 * netlbl_cfg_unlbl_static_add - Adds a new static label
194 * @net: network namespace
195 * @dev_name: interface name
196 * @addr: IP address in network byte order (struct in[6]_addr)
197 * @mask: address mask in network byte order (struct in[6]_addr)
198 * @family: address family
199 * @secid: LSM secid value for the entry
200 * @audit_info: NetLabel audit information
201 *
202 * Description:
203 * Adds a new NetLabel static label to be used when protocol provided labels
204 * are not present on incoming traffic. If @dev_name is NULL then the default
205 * interface will be used. Returns zero on success, negative values on failure.
206 *
207 */
208int netlbl_cfg_unlbl_static_add(struct net *net,
209 const char *dev_name,
210 const void *addr,
211 const void *mask,
212 u16 family,
213 u32 secid,
214 struct netlbl_audit *audit_info)
215{
216 u32 addr_len;
217
218 switch (family) {
219 case AF_INET:
220 addr_len = sizeof(struct in_addr);
221 break;
222#if IS_ENABLED(CONFIG_IPV6)
223 case AF_INET6:
224 addr_len = sizeof(struct in6_addr);
225 break;
226#endif /* IPv6 */
227 default:
228 return -EPFNOSUPPORT;
229 }
230
231 return netlbl_unlhsh_add(net,
232 dev_name, addr, mask, addr_len,
233 secid, audit_info);
234}
235
236/**
237 * netlbl_cfg_unlbl_static_del - Removes an existing static label
238 * @net: network namespace
239 * @dev_name: interface name
240 * @addr: IP address in network byte order (struct in[6]_addr)
241 * @mask: address mask in network byte order (struct in[6]_addr)
242 * @family: address family
243 * @audit_info: NetLabel audit information
244 *
245 * Description:
246 * Removes an existing NetLabel static label used when protocol provided labels
247 * are not present on incoming traffic. If @dev_name is NULL then the default
248 * interface will be used. Returns zero on success, negative values on failure.
249 *
250 */
251int netlbl_cfg_unlbl_static_del(struct net *net,
252 const char *dev_name,
253 const void *addr,
254 const void *mask,
255 u16 family,
256 struct netlbl_audit *audit_info)
257{
258 u32 addr_len;
259
260 switch (family) {
261 case AF_INET:
262 addr_len = sizeof(struct in_addr);
263 break;
264#if IS_ENABLED(CONFIG_IPV6)
265 case AF_INET6:
266 addr_len = sizeof(struct in6_addr);
267 break;
268#endif /* IPv6 */
269 default:
270 return -EPFNOSUPPORT;
271 }
272
273 return netlbl_unlhsh_remove(net,
274 dev_name, addr, mask, addr_len,
275 audit_info);
276}
277
278/**
279 * netlbl_cfg_cipsov4_add - Add a new CIPSOv4 DOI definition
280 * @doi_def: CIPSO DOI definition
281 * @audit_info: NetLabel audit information
282 *
283 * Description:
284 * Add a new CIPSO DOI definition as defined by @doi_def. Returns zero on
285 * success and negative values on failure.
286 *
287 */
288int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def,
289 struct netlbl_audit *audit_info)
290{
291 return cipso_v4_doi_add(doi_def, audit_info);
292}
293
294/**
295 * netlbl_cfg_cipsov4_del - Remove an existing CIPSOv4 DOI definition
296 * @doi: CIPSO DOI
297 * @audit_info: NetLabel audit information
298 *
299 * Description:
300 * Remove an existing CIPSO DOI definition matching @doi. Returns zero on
301 * success and negative values on failure.
302 *
303 */
304void netlbl_cfg_cipsov4_del(u32 doi, struct netlbl_audit *audit_info)
305{
306 cipso_v4_doi_remove(doi, audit_info);
307}
308
309/**
310 * netlbl_cfg_cipsov4_map_add - Add a new CIPSOv4 DOI mapping
311 * @doi: the CIPSO DOI
312 * @domain: the domain mapping to add
313 * @addr: IP address
314 * @mask: IP address mask
315 * @audit_info: NetLabel audit information
316 *
317 * Description:
318 * Add a new NetLabel/LSM domain mapping for the given CIPSO DOI to the NetLabel
319 * subsystem. A @domain value of NULL adds a new default domain mapping.
320 * Returns zero on success, negative values on failure.
321 *
322 */
323int netlbl_cfg_cipsov4_map_add(u32 doi,
324 const char *domain,
325 const struct in_addr *addr,
326 const struct in_addr *mask,
327 struct netlbl_audit *audit_info)
328{
329 int ret_val = -ENOMEM;
330 struct cipso_v4_doi *doi_def;
331 struct netlbl_dom_map *entry;
332 struct netlbl_domaddr_map *addrmap = NULL;
333 struct netlbl_domaddr4_map *addrinfo = NULL;
334
335 doi_def = cipso_v4_doi_getdef(doi);
336 if (doi_def == NULL)
337 return -ENOENT;
338
339 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
340 if (entry == NULL)
341 goto out_entry;
342 entry->family = AF_INET;
343 if (domain != NULL) {
344 entry->domain = kstrdup(domain, GFP_ATOMIC);
345 if (entry->domain == NULL)
346 goto out_domain;
347 }
348
349 if (addr == NULL && mask == NULL) {
350 entry->def.cipso = doi_def;
351 entry->def.type = NETLBL_NLTYPE_CIPSOV4;
352 } else if (addr != NULL && mask != NULL) {
353 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
354 if (addrmap == NULL)
355 goto out_addrmap;
356 INIT_LIST_HEAD(&addrmap->list4);
357 INIT_LIST_HEAD(&addrmap->list6);
358
359 addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC);
360 if (addrinfo == NULL)
361 goto out_addrinfo;
362 addrinfo->def.cipso = doi_def;
363 addrinfo->def.type = NETLBL_NLTYPE_CIPSOV4;
364 addrinfo->list.addr = addr->s_addr & mask->s_addr;
365 addrinfo->list.mask = mask->s_addr;
366 addrinfo->list.valid = 1;
367 ret_val = netlbl_af4list_add(&addrinfo->list, &addrmap->list4);
368 if (ret_val != 0)
369 goto cfg_cipsov4_map_add_failure;
370
371 entry->def.addrsel = addrmap;
372 entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
373 } else {
374 ret_val = -EINVAL;
375 goto out_addrmap;
376 }
377
378 ret_val = netlbl_domhsh_add(entry, audit_info);
379 if (ret_val != 0)
380 goto cfg_cipsov4_map_add_failure;
381
382 return 0;
383
384cfg_cipsov4_map_add_failure:
385 kfree(addrinfo);
386out_addrinfo:
387 kfree(addrmap);
388out_addrmap:
389 kfree(entry->domain);
390out_domain:
391 kfree(entry);
392out_entry:
393 cipso_v4_doi_putdef(doi_def);
394 return ret_val;
395}
396
397/**
398 * netlbl_cfg_calipso_add - Add a new CALIPSO DOI definition
399 * @doi_def: CALIPSO DOI definition
400 * @audit_info: NetLabel audit information
401 *
402 * Description:
403 * Add a new CALIPSO DOI definition as defined by @doi_def. Returns zero on
404 * success and negative values on failure.
405 *
406 */
407int netlbl_cfg_calipso_add(struct calipso_doi *doi_def,
408 struct netlbl_audit *audit_info)
409{
410#if IS_ENABLED(CONFIG_IPV6)
411 return calipso_doi_add(doi_def, audit_info);
412#else /* IPv6 */
413 return -ENOSYS;
414#endif /* IPv6 */
415}
416
417/**
418 * netlbl_cfg_calipso_del - Remove an existing CALIPSO DOI definition
419 * @doi: CALIPSO DOI
420 * @audit_info: NetLabel audit information
421 *
422 * Description:
423 * Remove an existing CALIPSO DOI definition matching @doi. Returns zero on
424 * success and negative values on failure.
425 *
426 */
427void netlbl_cfg_calipso_del(u32 doi, struct netlbl_audit *audit_info)
428{
429#if IS_ENABLED(CONFIG_IPV6)
430 calipso_doi_remove(doi, audit_info);
431#endif /* IPv6 */
432}
433
434/**
435 * netlbl_cfg_calipso_map_add - Add a new CALIPSO DOI mapping
436 * @doi: the CALIPSO DOI
437 * @domain: the domain mapping to add
438 * @addr: IP address
439 * @mask: IP address mask
440 * @audit_info: NetLabel audit information
441 *
442 * Description:
443 * Add a new NetLabel/LSM domain mapping for the given CALIPSO DOI to the
444 * NetLabel subsystem. A @domain value of NULL adds a new default domain
445 * mapping. Returns zero on success, negative values on failure.
446 *
447 */
448int netlbl_cfg_calipso_map_add(u32 doi,
449 const char *domain,
450 const struct in6_addr *addr,
451 const struct in6_addr *mask,
452 struct netlbl_audit *audit_info)
453{
454#if IS_ENABLED(CONFIG_IPV6)
455 int ret_val = -ENOMEM;
456 struct calipso_doi *doi_def;
457 struct netlbl_dom_map *entry;
458 struct netlbl_domaddr_map *addrmap = NULL;
459 struct netlbl_domaddr6_map *addrinfo = NULL;
460
461 doi_def = calipso_doi_getdef(doi);
462 if (doi_def == NULL)
463 return -ENOENT;
464
465 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
466 if (entry == NULL)
467 goto out_entry;
468 entry->family = AF_INET6;
469 if (domain != NULL) {
470 entry->domain = kstrdup(domain, GFP_ATOMIC);
471 if (entry->domain == NULL)
472 goto out_domain;
473 }
474
475 if (addr == NULL && mask == NULL) {
476 entry->def.calipso = doi_def;
477 entry->def.type = NETLBL_NLTYPE_CALIPSO;
478 } else if (addr != NULL && mask != NULL) {
479 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
480 if (addrmap == NULL)
481 goto out_addrmap;
482 INIT_LIST_HEAD(&addrmap->list4);
483 INIT_LIST_HEAD(&addrmap->list6);
484
485 addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC);
486 if (addrinfo == NULL)
487 goto out_addrinfo;
488 addrinfo->def.calipso = doi_def;
489 addrinfo->def.type = NETLBL_NLTYPE_CALIPSO;
490 addrinfo->list.addr = *addr;
491 addrinfo->list.addr.s6_addr32[0] &= mask->s6_addr32[0];
492 addrinfo->list.addr.s6_addr32[1] &= mask->s6_addr32[1];
493 addrinfo->list.addr.s6_addr32[2] &= mask->s6_addr32[2];
494 addrinfo->list.addr.s6_addr32[3] &= mask->s6_addr32[3];
495 addrinfo->list.mask = *mask;
496 addrinfo->list.valid = 1;
497 ret_val = netlbl_af6list_add(&addrinfo->list, &addrmap->list6);
498 if (ret_val != 0)
499 goto cfg_calipso_map_add_failure;
500
501 entry->def.addrsel = addrmap;
502 entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
503 } else {
504 ret_val = -EINVAL;
505 goto out_addrmap;
506 }
507
508 ret_val = netlbl_domhsh_add(entry, audit_info);
509 if (ret_val != 0)
510 goto cfg_calipso_map_add_failure;
511
512 return 0;
513
514cfg_calipso_map_add_failure:
515 kfree(addrinfo);
516out_addrinfo:
517 kfree(addrmap);
518out_addrmap:
519 kfree(entry->domain);
520out_domain:
521 kfree(entry);
522out_entry:
523 calipso_doi_putdef(doi_def);
524 return ret_val;
525#else /* IPv6 */
526 return -ENOSYS;
527#endif /* IPv6 */
528}
529
530/*
531 * Security Attribute Functions
532 */
533
534#define _CM_F_NONE 0x00000000
535#define _CM_F_ALLOC 0x00000001
536#define _CM_F_WALK 0x00000002
537
538/**
539 * _netlbl_catmap_getnode - Get a individual node from a catmap
540 * @catmap: pointer to the category bitmap
541 * @offset: the requested offset
542 * @cm_flags: catmap flags, see _CM_F_*
543 * @gfp_flags: memory allocation flags
544 *
545 * Description:
546 * Iterate through the catmap looking for the node associated with @offset.
547 * If the _CM_F_ALLOC flag is set in @cm_flags and there is no associated node,
548 * one will be created and inserted into the catmap. If the _CM_F_WALK flag is
549 * set in @cm_flags and there is no associated node, the next highest node will
550 * be returned. Returns a pointer to the node on success, NULL on failure.
551 *
552 */
553static struct netlbl_lsm_catmap *_netlbl_catmap_getnode(
554 struct netlbl_lsm_catmap **catmap,
555 u32 offset,
556 unsigned int cm_flags,
557 gfp_t gfp_flags)
558{
559 struct netlbl_lsm_catmap *iter = *catmap;
560 struct netlbl_lsm_catmap *prev = NULL;
561
562 if (iter == NULL)
563 goto catmap_getnode_alloc;
564 if (offset < iter->startbit)
565 goto catmap_getnode_walk;
566 while (iter && offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
567 prev = iter;
568 iter = iter->next;
569 }
570 if (iter == NULL || offset < iter->startbit)
571 goto catmap_getnode_walk;
572
573 return iter;
574
575catmap_getnode_walk:
576 if (cm_flags & _CM_F_WALK)
577 return iter;
578catmap_getnode_alloc:
579 if (!(cm_flags & _CM_F_ALLOC))
580 return NULL;
581
582 iter = netlbl_catmap_alloc(gfp_flags);
583 if (iter == NULL)
584 return NULL;
585 iter->startbit = offset & ~(NETLBL_CATMAP_SIZE - 1);
586
587 if (prev == NULL) {
588 iter->next = *catmap;
589 *catmap = iter;
590 } else {
591 iter->next = prev->next;
592 prev->next = iter;
593 }
594
595 return iter;
596}
597
598/**
599 * netlbl_catmap_walk - Walk a LSM secattr catmap looking for a bit
600 * @catmap: the category bitmap
601 * @offset: the offset to start searching at, in bits
602 *
603 * Description:
604 * This function walks a LSM secattr category bitmap starting at @offset and
605 * returns the spot of the first set bit or -ENOENT if no bits are set.
606 *
607 */
608int netlbl_catmap_walk(struct netlbl_lsm_catmap *catmap, u32 offset)
609{
610 struct netlbl_lsm_catmap *iter;
611 u32 idx;
612 u32 bit;
613 NETLBL_CATMAP_MAPTYPE bitmap;
614
615 iter = _netlbl_catmap_getnode(&catmap, offset, _CM_F_WALK, 0);
616 if (iter == NULL)
617 return -ENOENT;
618 if (offset > iter->startbit) {
619 offset -= iter->startbit;
620 idx = offset / NETLBL_CATMAP_MAPSIZE;
621 bit = offset % NETLBL_CATMAP_MAPSIZE;
622 } else {
623 idx = 0;
624 bit = 0;
625 }
626 bitmap = iter->bitmap[idx] >> bit;
627
628 for (;;) {
629 if (bitmap != 0) {
630 while ((bitmap & NETLBL_CATMAP_BIT) == 0) {
631 bitmap >>= 1;
632 bit++;
633 }
634 return iter->startbit +
635 (NETLBL_CATMAP_MAPSIZE * idx) + bit;
636 }
637 if (++idx >= NETLBL_CATMAP_MAPCNT) {
638 if (iter->next != NULL) {
639 iter = iter->next;
640 idx = 0;
641 } else
642 return -ENOENT;
643 }
644 bitmap = iter->bitmap[idx];
645 bit = 0;
646 }
647
648 return -ENOENT;
649}
650EXPORT_SYMBOL(netlbl_catmap_walk);
651
652/**
653 * netlbl_catmap_walkrng - Find the end of a string of set bits
654 * @catmap: the category bitmap
655 * @offset: the offset to start searching at, in bits
656 *
657 * Description:
658 * This function walks a LSM secattr category bitmap starting at @offset and
659 * returns the spot of the first cleared bit or -ENOENT if the offset is past
660 * the end of the bitmap.
661 *
662 */
663int netlbl_catmap_walkrng(struct netlbl_lsm_catmap *catmap, u32 offset)
664{
665 struct netlbl_lsm_catmap *iter;
666 struct netlbl_lsm_catmap *prev = NULL;
667 u32 idx;
668 u32 bit;
669 NETLBL_CATMAP_MAPTYPE bitmask;
670 NETLBL_CATMAP_MAPTYPE bitmap;
671
672 iter = _netlbl_catmap_getnode(&catmap, offset, _CM_F_WALK, 0);
673 if (iter == NULL)
674 return -ENOENT;
675 if (offset > iter->startbit) {
676 offset -= iter->startbit;
677 idx = offset / NETLBL_CATMAP_MAPSIZE;
678 bit = offset % NETLBL_CATMAP_MAPSIZE;
679 } else {
680 idx = 0;
681 bit = 0;
682 }
683 bitmask = NETLBL_CATMAP_BIT << bit;
684
685 for (;;) {
686 bitmap = iter->bitmap[idx];
687 while (bitmask != 0 && (bitmap & bitmask) != 0) {
688 bitmask <<= 1;
689 bit++;
690 }
691
692 if (prev && idx == 0 && bit == 0)
693 return prev->startbit + NETLBL_CATMAP_SIZE - 1;
694 else if (bitmask != 0)
695 return iter->startbit +
696 (NETLBL_CATMAP_MAPSIZE * idx) + bit - 1;
697 else if (++idx >= NETLBL_CATMAP_MAPCNT) {
698 if (iter->next == NULL)
699 return iter->startbit + NETLBL_CATMAP_SIZE - 1;
700 prev = iter;
701 iter = iter->next;
702 idx = 0;
703 }
704 bitmask = NETLBL_CATMAP_BIT;
705 bit = 0;
706 }
707
708 return -ENOENT;
709}
710
711/**
712 * netlbl_catmap_getlong - Export an unsigned long bitmap
713 * @catmap: pointer to the category bitmap
714 * @offset: pointer to the requested offset
715 * @bitmap: the exported bitmap
716 *
717 * Description:
718 * Export a bitmap with an offset greater than or equal to @offset and return
719 * it in @bitmap. The @offset must be aligned to an unsigned long and will be
720 * updated on return if different from what was requested; if the catmap is
721 * empty at the requested offset and beyond, the @offset is set to (u32)-1.
722 * Returns zero on success, negative values on failure.
723 *
724 */
725int netlbl_catmap_getlong(struct netlbl_lsm_catmap *catmap,
726 u32 *offset,
727 unsigned long *bitmap)
728{
729 struct netlbl_lsm_catmap *iter;
730 u32 off = *offset;
731 u32 idx;
732
733 /* only allow aligned offsets */
734 if ((off & (BITS_PER_LONG - 1)) != 0)
735 return -EINVAL;
736
737 /* a null catmap is equivalent to an empty one */
738 if (!catmap) {
739 *offset = (u32)-1;
740 return 0;
741 }
742
743 if (off < catmap->startbit) {
744 off = catmap->startbit;
745 *offset = off;
746 }
747 iter = _netlbl_catmap_getnode(&catmap, off, _CM_F_WALK, 0);
748 if (iter == NULL) {
749 *offset = (u32)-1;
750 return 0;
751 }
752
753 if (off < iter->startbit) {
754 *offset = iter->startbit;
755 off = 0;
756 } else
757 off -= iter->startbit;
758 idx = off / NETLBL_CATMAP_MAPSIZE;
759 *bitmap = iter->bitmap[idx] >> (off % NETLBL_CATMAP_MAPSIZE);
760
761 return 0;
762}
763
764/**
765 * netlbl_catmap_setbit - Set a bit in a LSM secattr catmap
766 * @catmap: pointer to the category bitmap
767 * @bit: the bit to set
768 * @flags: memory allocation flags
769 *
770 * Description:
771 * Set the bit specified by @bit in @catmap. Returns zero on success,
772 * negative values on failure.
773 *
774 */
775int netlbl_catmap_setbit(struct netlbl_lsm_catmap **catmap,
776 u32 bit,
777 gfp_t flags)
778{
779 struct netlbl_lsm_catmap *iter;
780 u32 idx;
781
782 iter = _netlbl_catmap_getnode(catmap, bit, _CM_F_ALLOC, flags);
783 if (iter == NULL)
784 return -ENOMEM;
785
786 bit -= iter->startbit;
787 idx = bit / NETLBL_CATMAP_MAPSIZE;
788 iter->bitmap[idx] |= NETLBL_CATMAP_BIT << (bit % NETLBL_CATMAP_MAPSIZE);
789
790 return 0;
791}
792EXPORT_SYMBOL(netlbl_catmap_setbit);
793
794/**
795 * netlbl_catmap_setrng - Set a range of bits in a LSM secattr catmap
796 * @catmap: pointer to the category bitmap
797 * @start: the starting bit
798 * @end: the last bit in the string
799 * @flags: memory allocation flags
800 *
801 * Description:
802 * Set a range of bits, starting at @start and ending with @end. Returns zero
803 * on success, negative values on failure.
804 *
805 */
806int netlbl_catmap_setrng(struct netlbl_lsm_catmap **catmap,
807 u32 start,
808 u32 end,
809 gfp_t flags)
810{
811 int rc = 0;
812 u32 spot = start;
813
814 while (rc == 0 && spot <= end) {
815 if (((spot & (BITS_PER_LONG - 1)) == 0) &&
816 ((end - spot) > BITS_PER_LONG)) {
817 rc = netlbl_catmap_setlong(catmap,
818 spot,
819 (unsigned long)-1,
820 flags);
821 spot += BITS_PER_LONG;
822 } else
823 rc = netlbl_catmap_setbit(catmap, spot++, flags);
824 }
825
826 return rc;
827}
828
829/**
830 * netlbl_catmap_setlong - Import an unsigned long bitmap
831 * @catmap: pointer to the category bitmap
832 * @offset: offset to the start of the imported bitmap
833 * @bitmap: the bitmap to import
834 * @flags: memory allocation flags
835 *
836 * Description:
837 * Import the bitmap specified in @bitmap into @catmap, using the offset
838 * in @offset. The offset must be aligned to an unsigned long. Returns zero
839 * on success, negative values on failure.
840 *
841 */
842int netlbl_catmap_setlong(struct netlbl_lsm_catmap **catmap,
843 u32 offset,
844 unsigned long bitmap,
845 gfp_t flags)
846{
847 struct netlbl_lsm_catmap *iter;
848 u32 idx;
849
850 /* only allow aligned offsets */
851 if ((offset & (BITS_PER_LONG - 1)) != 0)
852 return -EINVAL;
853
854 iter = _netlbl_catmap_getnode(catmap, offset, _CM_F_ALLOC, flags);
855 if (iter == NULL)
856 return -ENOMEM;
857
858 offset -= iter->startbit;
859 idx = offset / NETLBL_CATMAP_MAPSIZE;
860 iter->bitmap[idx] |= (NETLBL_CATMAP_MAPTYPE)bitmap
861 << (offset % NETLBL_CATMAP_MAPSIZE);
862
863 return 0;
864}
865
866/* Bitmap functions
867 */
868
869/**
870 * netlbl_bitmap_walk - Walk a bitmap looking for a bit
871 * @bitmap: the bitmap
872 * @bitmap_len: length in bits
873 * @offset: starting offset
874 * @state: if non-zero, look for a set (1) bit else look for a cleared (0) bit
875 *
876 * Description:
877 * Starting at @offset, walk the bitmap from left to right until either the
878 * desired bit is found or we reach the end. Return the bit offset, -1 if
879 * not found, or -2 if error.
880 */
881int netlbl_bitmap_walk(const unsigned char *bitmap, u32 bitmap_len,
882 u32 offset, u8 state)
883{
884 u32 bit_spot;
885 u32 byte_offset;
886 unsigned char bitmask;
887 unsigned char byte;
888
889 if (offset >= bitmap_len)
890 return -1;
891 byte_offset = offset / 8;
892 byte = bitmap[byte_offset];
893 bit_spot = offset;
894 bitmask = 0x80 >> (offset % 8);
895
896 while (bit_spot < bitmap_len) {
897 if ((state && (byte & bitmask) == bitmask) ||
898 (state == 0 && (byte & bitmask) == 0))
899 return bit_spot;
900
901 if (++bit_spot >= bitmap_len)
902 return -1;
903 bitmask >>= 1;
904 if (bitmask == 0) {
905 byte = bitmap[++byte_offset];
906 bitmask = 0x80;
907 }
908 }
909
910 return -1;
911}
912EXPORT_SYMBOL(netlbl_bitmap_walk);
913
914/**
915 * netlbl_bitmap_setbit - Sets a single bit in a bitmap
916 * @bitmap: the bitmap
917 * @bit: the bit
918 * @state: if non-zero, set the bit (1) else clear the bit (0)
919 *
920 * Description:
921 * Set a single bit in the bitmask. Returns zero on success, negative values
922 * on error.
923 */
924void netlbl_bitmap_setbit(unsigned char *bitmap, u32 bit, u8 state)
925{
926 u32 byte_spot;
927 u8 bitmask;
928
929 /* gcc always rounds to zero when doing integer division */
930 byte_spot = bit / 8;
931 bitmask = 0x80 >> (bit % 8);
932 if (state)
933 bitmap[byte_spot] |= bitmask;
934 else
935 bitmap[byte_spot] &= ~bitmask;
936}
937EXPORT_SYMBOL(netlbl_bitmap_setbit);
938
939/*
940 * LSM Functions
941 */
942
943/**
944 * netlbl_enabled - Determine if the NetLabel subsystem is enabled
945 *
946 * Description:
947 * The LSM can use this function to determine if it should use NetLabel
948 * security attributes in it's enforcement mechanism. Currently, NetLabel is
949 * considered to be enabled when it's configuration contains a valid setup for
950 * at least one labeled protocol (i.e. NetLabel can understand incoming
951 * labeled packets of at least one type); otherwise NetLabel is considered to
952 * be disabled.
953 *
954 */
955int netlbl_enabled(void)
956{
957 /* At some point we probably want to expose this mechanism to the user
958 * as well so that admins can toggle NetLabel regardless of the
959 * configuration */
960 return (atomic_read(&netlabel_mgmt_protocount) > 0);
961}
962
963/**
964 * netlbl_sock_setattr - Label a socket using the correct protocol
965 * @sk: the socket to label
966 * @family: protocol family
967 * @secattr: the security attributes
968 *
969 * Description:
970 * Attach the correct label to the given socket using the security attributes
971 * specified in @secattr. This function requires exclusive access to @sk,
972 * which means it either needs to be in the process of being created or locked.
973 * Returns zero on success, -EDESTADDRREQ if the domain is configured to use
974 * network address selectors (can't blindly label the socket), and negative
975 * values on all other failures.
976 *
977 */
978int netlbl_sock_setattr(struct sock *sk,
979 u16 family,
980 const struct netlbl_lsm_secattr *secattr)
981{
982 int ret_val;
983 struct netlbl_dom_map *dom_entry;
984
985 rcu_read_lock();
986 dom_entry = netlbl_domhsh_getentry(secattr->domain, family);
987 if (dom_entry == NULL) {
988 ret_val = -ENOENT;
989 goto socket_setattr_return;
990 }
991 switch (family) {
992 case AF_INET:
993 switch (dom_entry->def.type) {
994 case NETLBL_NLTYPE_ADDRSELECT:
995 ret_val = -EDESTADDRREQ;
996 break;
997 case NETLBL_NLTYPE_CIPSOV4:
998 ret_val = cipso_v4_sock_setattr(sk,
999 dom_entry->def.cipso,
1000 secattr);
1001 break;
1002 case NETLBL_NLTYPE_UNLABELED:
1003 ret_val = 0;
1004 break;
1005 default:
1006 ret_val = -ENOENT;
1007 }
1008 break;
1009#if IS_ENABLED(CONFIG_IPV6)
1010 case AF_INET6:
1011 switch (dom_entry->def.type) {
1012 case NETLBL_NLTYPE_ADDRSELECT:
1013 ret_val = -EDESTADDRREQ;
1014 break;
1015 case NETLBL_NLTYPE_CALIPSO:
1016 ret_val = calipso_sock_setattr(sk,
1017 dom_entry->def.calipso,
1018 secattr);
1019 break;
1020 case NETLBL_NLTYPE_UNLABELED:
1021 ret_val = 0;
1022 break;
1023 default:
1024 ret_val = -ENOENT;
1025 }
1026 break;
1027#endif /* IPv6 */
1028 default:
1029 ret_val = -EPROTONOSUPPORT;
1030 }
1031
1032socket_setattr_return:
1033 rcu_read_unlock();
1034 return ret_val;
1035}
1036
1037/**
1038 * netlbl_sock_delattr - Delete all the NetLabel labels on a socket
1039 * @sk: the socket
1040 *
1041 * Description:
1042 * Remove all the NetLabel labeling from @sk. The caller is responsible for
1043 * ensuring that @sk is locked.
1044 *
1045 */
1046void netlbl_sock_delattr(struct sock *sk)
1047{
1048 switch (sk->sk_family) {
1049 case AF_INET:
1050 cipso_v4_sock_delattr(sk);
1051 break;
1052#if IS_ENABLED(CONFIG_IPV6)
1053 case AF_INET6:
1054 calipso_sock_delattr(sk);
1055 break;
1056#endif /* IPv6 */
1057 }
1058}
1059
1060/**
1061 * netlbl_sock_getattr - Determine the security attributes of a sock
1062 * @sk: the sock
1063 * @secattr: the security attributes
1064 *
1065 * Description:
1066 * Examines the given sock to see if any NetLabel style labeling has been
1067 * applied to the sock, if so it parses the socket label and returns the
1068 * security attributes in @secattr. Returns zero on success, negative values
1069 * on failure.
1070 *
1071 */
1072int netlbl_sock_getattr(struct sock *sk,
1073 struct netlbl_lsm_secattr *secattr)
1074{
1075 int ret_val;
1076
1077 switch (sk->sk_family) {
1078 case AF_INET:
1079 ret_val = cipso_v4_sock_getattr(sk, secattr);
1080 break;
1081#if IS_ENABLED(CONFIG_IPV6)
1082 case AF_INET6:
1083 ret_val = calipso_sock_getattr(sk, secattr);
1084 break;
1085#endif /* IPv6 */
1086 default:
1087 ret_val = -EPROTONOSUPPORT;
1088 }
1089
1090 return ret_val;
1091}
1092
1093/**
1094 * netlbl_conn_setattr - Label a connected socket using the correct protocol
1095 * @sk: the socket to label
1096 * @addr: the destination address
1097 * @secattr: the security attributes
1098 *
1099 * Description:
1100 * Attach the correct label to the given connected socket using the security
1101 * attributes specified in @secattr. The caller is responsible for ensuring
1102 * that @sk is locked. Returns zero on success, negative values on failure.
1103 *
1104 */
1105int netlbl_conn_setattr(struct sock *sk,
1106 struct sockaddr *addr,
1107 const struct netlbl_lsm_secattr *secattr)
1108{
1109 int ret_val;
1110 struct sockaddr_in *addr4;
1111#if IS_ENABLED(CONFIG_IPV6)
1112 struct sockaddr_in6 *addr6;
1113#endif
1114 struct netlbl_dommap_def *entry;
1115
1116 rcu_read_lock();
1117 switch (addr->sa_family) {
1118 case AF_INET:
1119 addr4 = (struct sockaddr_in *)addr;
1120 entry = netlbl_domhsh_getentry_af4(secattr->domain,
1121 addr4->sin_addr.s_addr);
1122 if (entry == NULL) {
1123 ret_val = -ENOENT;
1124 goto conn_setattr_return;
1125 }
1126 switch (entry->type) {
1127 case NETLBL_NLTYPE_CIPSOV4:
1128 ret_val = cipso_v4_sock_setattr(sk,
1129 entry->cipso, secattr);
1130 break;
1131 case NETLBL_NLTYPE_UNLABELED:
1132 /* just delete the protocols we support for right now
1133 * but we could remove other protocols if needed */
1134 netlbl_sock_delattr(sk);
1135 ret_val = 0;
1136 break;
1137 default:
1138 ret_val = -ENOENT;
1139 }
1140 break;
1141#if IS_ENABLED(CONFIG_IPV6)
1142 case AF_INET6:
1143 addr6 = (struct sockaddr_in6 *)addr;
1144 entry = netlbl_domhsh_getentry_af6(secattr->domain,
1145 &addr6->sin6_addr);
1146 if (entry == NULL) {
1147 ret_val = -ENOENT;
1148 goto conn_setattr_return;
1149 }
1150 switch (entry->type) {
1151 case NETLBL_NLTYPE_CALIPSO:
1152 ret_val = calipso_sock_setattr(sk,
1153 entry->calipso, secattr);
1154 break;
1155 case NETLBL_NLTYPE_UNLABELED:
1156 /* just delete the protocols we support for right now
1157 * but we could remove other protocols if needed */
1158 netlbl_sock_delattr(sk);
1159 ret_val = 0;
1160 break;
1161 default:
1162 ret_val = -ENOENT;
1163 }
1164 break;
1165#endif /* IPv6 */
1166 default:
1167 ret_val = -EPROTONOSUPPORT;
1168 }
1169
1170conn_setattr_return:
1171 rcu_read_unlock();
1172 return ret_val;
1173}
1174
1175/**
1176 * netlbl_req_setattr - Label a request socket using the correct protocol
1177 * @req: the request socket to label
1178 * @secattr: the security attributes
1179 *
1180 * Description:
1181 * Attach the correct label to the given socket using the security attributes
1182 * specified in @secattr. Returns zero on success, negative values on failure.
1183 *
1184 */
1185int netlbl_req_setattr(struct request_sock *req,
1186 const struct netlbl_lsm_secattr *secattr)
1187{
1188 int ret_val;
1189 struct netlbl_dommap_def *entry;
1190 struct inet_request_sock *ireq = inet_rsk(req);
1191
1192 rcu_read_lock();
1193 switch (req->rsk_ops->family) {
1194 case AF_INET:
1195 entry = netlbl_domhsh_getentry_af4(secattr->domain,
1196 ireq->ir_rmt_addr);
1197 if (entry == NULL) {
1198 ret_val = -ENOENT;
1199 goto req_setattr_return;
1200 }
1201 switch (entry->type) {
1202 case NETLBL_NLTYPE_CIPSOV4:
1203 ret_val = cipso_v4_req_setattr(req,
1204 entry->cipso, secattr);
1205 break;
1206 case NETLBL_NLTYPE_UNLABELED:
1207 netlbl_req_delattr(req);
1208 ret_val = 0;
1209 break;
1210 default:
1211 ret_val = -ENOENT;
1212 }
1213 break;
1214#if IS_ENABLED(CONFIG_IPV6)
1215 case AF_INET6:
1216 entry = netlbl_domhsh_getentry_af6(secattr->domain,
1217 &ireq->ir_v6_rmt_addr);
1218 if (entry == NULL) {
1219 ret_val = -ENOENT;
1220 goto req_setattr_return;
1221 }
1222 switch (entry->type) {
1223 case NETLBL_NLTYPE_CALIPSO:
1224 ret_val = calipso_req_setattr(req,
1225 entry->calipso, secattr);
1226 break;
1227 case NETLBL_NLTYPE_UNLABELED:
1228 netlbl_req_delattr(req);
1229 ret_val = 0;
1230 break;
1231 default:
1232 ret_val = -ENOENT;
1233 }
1234 break;
1235#endif /* IPv6 */
1236 default:
1237 ret_val = -EPROTONOSUPPORT;
1238 }
1239
1240req_setattr_return:
1241 rcu_read_unlock();
1242 return ret_val;
1243}
1244
1245/**
1246* netlbl_req_delattr - Delete all the NetLabel labels on a socket
1247* @req: the socket
1248*
1249* Description:
1250* Remove all the NetLabel labeling from @req.
1251*
1252*/
1253void netlbl_req_delattr(struct request_sock *req)
1254{
1255 switch (req->rsk_ops->family) {
1256 case AF_INET:
1257 cipso_v4_req_delattr(req);
1258 break;
1259#if IS_ENABLED(CONFIG_IPV6)
1260 case AF_INET6:
1261 calipso_req_delattr(req);
1262 break;
1263#endif /* IPv6 */
1264 }
1265}
1266
1267/**
1268 * netlbl_skbuff_setattr - Label a packet using the correct protocol
1269 * @skb: the packet
1270 * @family: protocol family
1271 * @secattr: the security attributes
1272 *
1273 * Description:
1274 * Attach the correct label to the given packet using the security attributes
1275 * specified in @secattr. Returns zero on success, negative values on failure.
1276 *
1277 */
1278int netlbl_skbuff_setattr(struct sk_buff *skb,
1279 u16 family,
1280 const struct netlbl_lsm_secattr *secattr)
1281{
1282 int ret_val;
1283 struct iphdr *hdr4;
1284#if IS_ENABLED(CONFIG_IPV6)
1285 struct ipv6hdr *hdr6;
1286#endif
1287 struct netlbl_dommap_def *entry;
1288
1289 rcu_read_lock();
1290 switch (family) {
1291 case AF_INET:
1292 hdr4 = ip_hdr(skb);
1293 entry = netlbl_domhsh_getentry_af4(secattr->domain,
1294 hdr4->daddr);
1295 if (entry == NULL) {
1296 ret_val = -ENOENT;
1297 goto skbuff_setattr_return;
1298 }
1299 switch (entry->type) {
1300 case NETLBL_NLTYPE_CIPSOV4:
1301 ret_val = cipso_v4_skbuff_setattr(skb, entry->cipso,
1302 secattr);
1303 break;
1304 case NETLBL_NLTYPE_UNLABELED:
1305 /* just delete the protocols we support for right now
1306 * but we could remove other protocols if needed */
1307 ret_val = cipso_v4_skbuff_delattr(skb);
1308 break;
1309 default:
1310 ret_val = -ENOENT;
1311 }
1312 break;
1313#if IS_ENABLED(CONFIG_IPV6)
1314 case AF_INET6:
1315 hdr6 = ipv6_hdr(skb);
1316 entry = netlbl_domhsh_getentry_af6(secattr->domain,
1317 &hdr6->daddr);
1318 if (entry == NULL) {
1319 ret_val = -ENOENT;
1320 goto skbuff_setattr_return;
1321 }
1322 switch (entry->type) {
1323 case NETLBL_NLTYPE_CALIPSO:
1324 ret_val = calipso_skbuff_setattr(skb, entry->calipso,
1325 secattr);
1326 break;
1327 case NETLBL_NLTYPE_UNLABELED:
1328 /* just delete the protocols we support for right now
1329 * but we could remove other protocols if needed */
1330 ret_val = calipso_skbuff_delattr(skb);
1331 break;
1332 default:
1333 ret_val = -ENOENT;
1334 }
1335 break;
1336#endif /* IPv6 */
1337 default:
1338 ret_val = -EPROTONOSUPPORT;
1339 }
1340
1341skbuff_setattr_return:
1342 rcu_read_unlock();
1343 return ret_val;
1344}
1345
1346/**
1347 * netlbl_skbuff_getattr - Determine the security attributes of a packet
1348 * @skb: the packet
1349 * @family: protocol family
1350 * @secattr: the security attributes
1351 *
1352 * Description:
1353 * Examines the given packet to see if a recognized form of packet labeling
1354 * is present, if so it parses the packet label and returns the security
1355 * attributes in @secattr. Returns zero on success, negative values on
1356 * failure.
1357 *
1358 */
1359int netlbl_skbuff_getattr(const struct sk_buff *skb,
1360 u16 family,
1361 struct netlbl_lsm_secattr *secattr)
1362{
1363 unsigned char *ptr;
1364
1365 switch (family) {
1366 case AF_INET:
1367 ptr = cipso_v4_optptr(skb);
1368 if (ptr && cipso_v4_getattr(ptr, secattr) == 0)
1369 return 0;
1370 break;
1371#if IS_ENABLED(CONFIG_IPV6)
1372 case AF_INET6:
1373 ptr = calipso_optptr(skb);
1374 if (ptr && calipso_getattr(ptr, secattr) == 0)
1375 return 0;
1376 break;
1377#endif /* IPv6 */
1378 }
1379
1380 return netlbl_unlabel_getattr(skb, family, secattr);
1381}
1382
1383/**
1384 * netlbl_skbuff_err - Handle a LSM error on a sk_buff
1385 * @skb: the packet
1386 * @family: the family
1387 * @error: the error code
1388 * @gateway: true if host is acting as a gateway, false otherwise
1389 *
1390 * Description:
1391 * Deal with a LSM problem when handling the packet in @skb, typically this is
1392 * a permission denied problem (-EACCES). The correct action is determined
1393 * according to the packet's labeling protocol.
1394 *
1395 */
1396void netlbl_skbuff_err(struct sk_buff *skb, u16 family, int error, int gateway)
1397{
1398 switch (family) {
1399 case AF_INET:
1400 if (cipso_v4_optptr(skb))
1401 cipso_v4_error(skb, error, gateway);
1402 break;
1403 }
1404}
1405
1406/**
1407 * netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches
1408 *
1409 * Description:
1410 * For all of the NetLabel protocols that support some form of label mapping
1411 * cache, invalidate the cache. Returns zero on success, negative values on
1412 * error.
1413 *
1414 */
1415void netlbl_cache_invalidate(void)
1416{
1417 cipso_v4_cache_invalidate();
1418#if IS_ENABLED(CONFIG_IPV6)
1419 calipso_cache_invalidate();
1420#endif /* IPv6 */
1421}
1422
1423/**
1424 * netlbl_cache_add - Add an entry to a NetLabel protocol cache
1425 * @skb: the packet
1426 * @family: the family
1427 * @secattr: the packet's security attributes
1428 *
1429 * Description:
1430 * Add the LSM security attributes for the given packet to the underlying
1431 * NetLabel protocol's label mapping cache. Returns zero on success, negative
1432 * values on error.
1433 *
1434 */
1435int netlbl_cache_add(const struct sk_buff *skb, u16 family,
1436 const struct netlbl_lsm_secattr *secattr)
1437{
1438 unsigned char *ptr;
1439
1440 if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0)
1441 return -ENOMSG;
1442
1443 switch (family) {
1444 case AF_INET:
1445 ptr = cipso_v4_optptr(skb);
1446 if (ptr)
1447 return cipso_v4_cache_add(ptr, secattr);
1448 break;
1449#if IS_ENABLED(CONFIG_IPV6)
1450 case AF_INET6:
1451 ptr = calipso_optptr(skb);
1452 if (ptr)
1453 return calipso_cache_add(ptr, secattr);
1454 break;
1455#endif /* IPv6 */
1456 }
1457 return -ENOMSG;
1458}
1459
1460/*
1461 * Protocol Engine Functions
1462 */
1463
1464/**
1465 * netlbl_audit_start - Start an audit message
1466 * @type: audit message type
1467 * @audit_info: NetLabel audit information
1468 *
1469 * Description:
1470 * Start an audit message using the type specified in @type and fill the audit
1471 * message with some fields common to all NetLabel audit messages. This
1472 * function should only be used by protocol engines, not LSMs. Returns a
1473 * pointer to the audit buffer on success, NULL on failure.
1474 *
1475 */
1476struct audit_buffer *netlbl_audit_start(int type,
1477 struct netlbl_audit *audit_info)
1478{
1479 return netlbl_audit_start_common(type, audit_info);
1480}
1481EXPORT_SYMBOL(netlbl_audit_start);
1482
1483/*
1484 * Setup Functions
1485 */
1486
1487/**
1488 * netlbl_init - Initialize NetLabel
1489 *
1490 * Description:
1491 * Perform the required NetLabel initialization before first use.
1492 *
1493 */
1494static int __init netlbl_init(void)
1495{
1496 int ret_val;
1497
1498 printk(KERN_INFO "NetLabel: Initializing\n");
1499 printk(KERN_INFO "NetLabel: domain hash size = %u\n",
1500 (1 << NETLBL_DOMHSH_BITSIZE));
1501 printk(KERN_INFO "NetLabel: protocols = UNLABELED CIPSOv4 CALIPSO\n");
1502
1503 ret_val = netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE);
1504 if (ret_val != 0)
1505 goto init_failure;
1506
1507 ret_val = netlbl_unlabel_init(NETLBL_UNLHSH_BITSIZE);
1508 if (ret_val != 0)
1509 goto init_failure;
1510
1511 ret_val = netlbl_netlink_init();
1512 if (ret_val != 0)
1513 goto init_failure;
1514
1515 ret_val = netlbl_unlabel_defconf();
1516 if (ret_val != 0)
1517 goto init_failure;
1518 printk(KERN_INFO "NetLabel: unlabeled traffic allowed by default\n");
1519
1520 return 0;
1521
1522init_failure:
1523 panic("NetLabel: failed to initialize properly (%d)\n", ret_val);
1524}
1525
1526subsys_initcall(netlbl_init);