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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 sucess, 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 if (off < catmap->startbit) {
738 off = catmap->startbit;
739 *offset = off;
740 }
741 iter = _netlbl_catmap_getnode(&catmap, off, _CM_F_WALK, 0);
742 if (iter == NULL) {
743 *offset = (u32)-1;
744 return 0;
745 }
746
747 if (off < iter->startbit) {
748 *offset = iter->startbit;
749 off = 0;
750 } else
751 off -= iter->startbit;
752 idx = off / NETLBL_CATMAP_MAPSIZE;
753 *bitmap = iter->bitmap[idx] >> (off % NETLBL_CATMAP_MAPSIZE);
754
755 return 0;
756}
757
758/**
759 * netlbl_catmap_setbit - Set a bit in a LSM secattr catmap
760 * @catmap: pointer to the category bitmap
761 * @bit: the bit to set
762 * @flags: memory allocation flags
763 *
764 * Description:
765 * Set the bit specified by @bit in @catmap. Returns zero on success,
766 * negative values on failure.
767 *
768 */
769int netlbl_catmap_setbit(struct netlbl_lsm_catmap **catmap,
770 u32 bit,
771 gfp_t flags)
772{
773 struct netlbl_lsm_catmap *iter;
774 u32 idx;
775
776 iter = _netlbl_catmap_getnode(catmap, bit, _CM_F_ALLOC, flags);
777 if (iter == NULL)
778 return -ENOMEM;
779
780 bit -= iter->startbit;
781 idx = bit / NETLBL_CATMAP_MAPSIZE;
782 iter->bitmap[idx] |= NETLBL_CATMAP_BIT << (bit % NETLBL_CATMAP_MAPSIZE);
783
784 return 0;
785}
786EXPORT_SYMBOL(netlbl_catmap_setbit);
787
788/**
789 * netlbl_catmap_setrng - Set a range of bits in a LSM secattr catmap
790 * @catmap: pointer to the category bitmap
791 * @start: the starting bit
792 * @end: the last bit in the string
793 * @flags: memory allocation flags
794 *
795 * Description:
796 * Set a range of bits, starting at @start and ending with @end. Returns zero
797 * on success, negative values on failure.
798 *
799 */
800int netlbl_catmap_setrng(struct netlbl_lsm_catmap **catmap,
801 u32 start,
802 u32 end,
803 gfp_t flags)
804{
805 int rc = 0;
806 u32 spot = start;
807
808 while (rc == 0 && spot <= end) {
809 if (((spot & (BITS_PER_LONG - 1)) == 0) &&
810 ((end - spot) > BITS_PER_LONG)) {
811 rc = netlbl_catmap_setlong(catmap,
812 spot,
813 (unsigned long)-1,
814 flags);
815 spot += BITS_PER_LONG;
816 } else
817 rc = netlbl_catmap_setbit(catmap, spot++, flags);
818 }
819
820 return rc;
821}
822
823/**
824 * netlbl_catmap_setlong - Import an unsigned long bitmap
825 * @catmap: pointer to the category bitmap
826 * @offset: offset to the start of the imported bitmap
827 * @bitmap: the bitmap to import
828 * @flags: memory allocation flags
829 *
830 * Description:
831 * Import the bitmap specified in @bitmap into @catmap, using the offset
832 * in @offset. The offset must be aligned to an unsigned long. Returns zero
833 * on success, negative values on failure.
834 *
835 */
836int netlbl_catmap_setlong(struct netlbl_lsm_catmap **catmap,
837 u32 offset,
838 unsigned long bitmap,
839 gfp_t flags)
840{
841 struct netlbl_lsm_catmap *iter;
842 u32 idx;
843
844 /* only allow aligned offsets */
845 if ((offset & (BITS_PER_LONG - 1)) != 0)
846 return -EINVAL;
847
848 iter = _netlbl_catmap_getnode(catmap, offset, _CM_F_ALLOC, flags);
849 if (iter == NULL)
850 return -ENOMEM;
851
852 offset -= iter->startbit;
853 idx = offset / NETLBL_CATMAP_MAPSIZE;
854 iter->bitmap[idx] |= bitmap << (offset % NETLBL_CATMAP_MAPSIZE);
855
856 return 0;
857}
858
859/* Bitmap functions
860 */
861
862/**
863 * netlbl_bitmap_walk - Walk a bitmap looking for a bit
864 * @bitmap: the bitmap
865 * @bitmap_len: length in bits
866 * @offset: starting offset
867 * @state: if non-zero, look for a set (1) bit else look for a cleared (0) bit
868 *
869 * Description:
870 * Starting at @offset, walk the bitmap from left to right until either the
871 * desired bit is found or we reach the end. Return the bit offset, -1 if
872 * not found, or -2 if error.
873 */
874int netlbl_bitmap_walk(const unsigned char *bitmap, u32 bitmap_len,
875 u32 offset, u8 state)
876{
877 u32 bit_spot;
878 u32 byte_offset;
879 unsigned char bitmask;
880 unsigned char byte;
881
882 byte_offset = offset / 8;
883 byte = bitmap[byte_offset];
884 bit_spot = offset;
885 bitmask = 0x80 >> (offset % 8);
886
887 while (bit_spot < bitmap_len) {
888 if ((state && (byte & bitmask) == bitmask) ||
889 (state == 0 && (byte & bitmask) == 0))
890 return bit_spot;
891
892 if (++bit_spot >= bitmap_len)
893 return -1;
894 bitmask >>= 1;
895 if (bitmask == 0) {
896 byte = bitmap[++byte_offset];
897 bitmask = 0x80;
898 }
899 }
900
901 return -1;
902}
903EXPORT_SYMBOL(netlbl_bitmap_walk);
904
905/**
906 * netlbl_bitmap_setbit - Sets a single bit in a bitmap
907 * @bitmap: the bitmap
908 * @bit: the bit
909 * @state: if non-zero, set the bit (1) else clear the bit (0)
910 *
911 * Description:
912 * Set a single bit in the bitmask. Returns zero on success, negative values
913 * on error.
914 */
915void netlbl_bitmap_setbit(unsigned char *bitmap, u32 bit, u8 state)
916{
917 u32 byte_spot;
918 u8 bitmask;
919
920 /* gcc always rounds to zero when doing integer division */
921 byte_spot = bit / 8;
922 bitmask = 0x80 >> (bit % 8);
923 if (state)
924 bitmap[byte_spot] |= bitmask;
925 else
926 bitmap[byte_spot] &= ~bitmask;
927}
928EXPORT_SYMBOL(netlbl_bitmap_setbit);
929
930/*
931 * LSM Functions
932 */
933
934/**
935 * netlbl_enabled - Determine if the NetLabel subsystem is enabled
936 *
937 * Description:
938 * The LSM can use this function to determine if it should use NetLabel
939 * security attributes in it's enforcement mechanism. Currently, NetLabel is
940 * considered to be enabled when it's configuration contains a valid setup for
941 * at least one labeled protocol (i.e. NetLabel can understand incoming
942 * labeled packets of at least one type); otherwise NetLabel is considered to
943 * be disabled.
944 *
945 */
946int netlbl_enabled(void)
947{
948 /* At some point we probably want to expose this mechanism to the user
949 * as well so that admins can toggle NetLabel regardless of the
950 * configuration */
951 return (atomic_read(&netlabel_mgmt_protocount) > 0);
952}
953
954/**
955 * netlbl_sock_setattr - Label a socket using the correct protocol
956 * @sk: the socket to label
957 * @family: protocol family
958 * @secattr: the security attributes
959 *
960 * Description:
961 * Attach the correct label to the given socket using the security attributes
962 * specified in @secattr. This function requires exclusive access to @sk,
963 * which means it either needs to be in the process of being created or locked.
964 * Returns zero on success, -EDESTADDRREQ if the domain is configured to use
965 * network address selectors (can't blindly label the socket), and negative
966 * values on all other failures.
967 *
968 */
969int netlbl_sock_setattr(struct sock *sk,
970 u16 family,
971 const struct netlbl_lsm_secattr *secattr)
972{
973 int ret_val;
974 struct netlbl_dom_map *dom_entry;
975
976 rcu_read_lock();
977 dom_entry = netlbl_domhsh_getentry(secattr->domain, family);
978 if (dom_entry == NULL) {
979 ret_val = -ENOENT;
980 goto socket_setattr_return;
981 }
982 switch (family) {
983 case AF_INET:
984 switch (dom_entry->def.type) {
985 case NETLBL_NLTYPE_ADDRSELECT:
986 ret_val = -EDESTADDRREQ;
987 break;
988 case NETLBL_NLTYPE_CIPSOV4:
989 ret_val = cipso_v4_sock_setattr(sk,
990 dom_entry->def.cipso,
991 secattr);
992 break;
993 case NETLBL_NLTYPE_UNLABELED:
994 ret_val = 0;
995 break;
996 default:
997 ret_val = -ENOENT;
998 }
999 break;
1000#if IS_ENABLED(CONFIG_IPV6)
1001 case AF_INET6:
1002 switch (dom_entry->def.type) {
1003 case NETLBL_NLTYPE_ADDRSELECT:
1004 ret_val = -EDESTADDRREQ;
1005 break;
1006 case NETLBL_NLTYPE_CALIPSO:
1007 ret_val = calipso_sock_setattr(sk,
1008 dom_entry->def.calipso,
1009 secattr);
1010 break;
1011 case NETLBL_NLTYPE_UNLABELED:
1012 ret_val = 0;
1013 break;
1014 default:
1015 ret_val = -ENOENT;
1016 }
1017 break;
1018#endif /* IPv6 */
1019 default:
1020 ret_val = -EPROTONOSUPPORT;
1021 }
1022
1023socket_setattr_return:
1024 rcu_read_unlock();
1025 return ret_val;
1026}
1027
1028/**
1029 * netlbl_sock_delattr - Delete all the NetLabel labels on a socket
1030 * @sk: the socket
1031 *
1032 * Description:
1033 * Remove all the NetLabel labeling from @sk. The caller is responsible for
1034 * ensuring that @sk is locked.
1035 *
1036 */
1037void netlbl_sock_delattr(struct sock *sk)
1038{
1039 switch (sk->sk_family) {
1040 case AF_INET:
1041 cipso_v4_sock_delattr(sk);
1042 break;
1043#if IS_ENABLED(CONFIG_IPV6)
1044 case AF_INET6:
1045 calipso_sock_delattr(sk);
1046 break;
1047#endif /* IPv6 */
1048 }
1049}
1050
1051/**
1052 * netlbl_sock_getattr - Determine the security attributes of a sock
1053 * @sk: the sock
1054 * @secattr: the security attributes
1055 *
1056 * Description:
1057 * Examines the given sock to see if any NetLabel style labeling has been
1058 * applied to the sock, if so it parses the socket label and returns the
1059 * security attributes in @secattr. Returns zero on success, negative values
1060 * on failure.
1061 *
1062 */
1063int netlbl_sock_getattr(struct sock *sk,
1064 struct netlbl_lsm_secattr *secattr)
1065{
1066 int ret_val;
1067
1068 switch (sk->sk_family) {
1069 case AF_INET:
1070 ret_val = cipso_v4_sock_getattr(sk, secattr);
1071 break;
1072#if IS_ENABLED(CONFIG_IPV6)
1073 case AF_INET6:
1074 ret_val = calipso_sock_getattr(sk, secattr);
1075 break;
1076#endif /* IPv6 */
1077 default:
1078 ret_val = -EPROTONOSUPPORT;
1079 }
1080
1081 return ret_val;
1082}
1083
1084/**
1085 * netlbl_conn_setattr - Label a connected socket using the correct protocol
1086 * @sk: the socket to label
1087 * @addr: the destination address
1088 * @secattr: the security attributes
1089 *
1090 * Description:
1091 * Attach the correct label to the given connected socket using the security
1092 * attributes specified in @secattr. The caller is responsible for ensuring
1093 * that @sk is locked. Returns zero on success, negative values on failure.
1094 *
1095 */
1096int netlbl_conn_setattr(struct sock *sk,
1097 struct sockaddr *addr,
1098 const struct netlbl_lsm_secattr *secattr)
1099{
1100 int ret_val;
1101 struct sockaddr_in *addr4;
1102#if IS_ENABLED(CONFIG_IPV6)
1103 struct sockaddr_in6 *addr6;
1104#endif
1105 struct netlbl_dommap_def *entry;
1106
1107 rcu_read_lock();
1108 switch (addr->sa_family) {
1109 case AF_INET:
1110 addr4 = (struct sockaddr_in *)addr;
1111 entry = netlbl_domhsh_getentry_af4(secattr->domain,
1112 addr4->sin_addr.s_addr);
1113 if (entry == NULL) {
1114 ret_val = -ENOENT;
1115 goto conn_setattr_return;
1116 }
1117 switch (entry->type) {
1118 case NETLBL_NLTYPE_CIPSOV4:
1119 ret_val = cipso_v4_sock_setattr(sk,
1120 entry->cipso, secattr);
1121 break;
1122 case NETLBL_NLTYPE_UNLABELED:
1123 /* just delete the protocols we support for right now
1124 * but we could remove other protocols if needed */
1125 netlbl_sock_delattr(sk);
1126 ret_val = 0;
1127 break;
1128 default:
1129 ret_val = -ENOENT;
1130 }
1131 break;
1132#if IS_ENABLED(CONFIG_IPV6)
1133 case AF_INET6:
1134 addr6 = (struct sockaddr_in6 *)addr;
1135 entry = netlbl_domhsh_getentry_af6(secattr->domain,
1136 &addr6->sin6_addr);
1137 if (entry == NULL) {
1138 ret_val = -ENOENT;
1139 goto conn_setattr_return;
1140 }
1141 switch (entry->type) {
1142 case NETLBL_NLTYPE_CALIPSO:
1143 ret_val = calipso_sock_setattr(sk,
1144 entry->calipso, secattr);
1145 break;
1146 case NETLBL_NLTYPE_UNLABELED:
1147 /* just delete the protocols we support for right now
1148 * but we could remove other protocols if needed */
1149 netlbl_sock_delattr(sk);
1150 ret_val = 0;
1151 break;
1152 default:
1153 ret_val = -ENOENT;
1154 }
1155 break;
1156#endif /* IPv6 */
1157 default:
1158 ret_val = -EPROTONOSUPPORT;
1159 }
1160
1161conn_setattr_return:
1162 rcu_read_unlock();
1163 return ret_val;
1164}
1165
1166/**
1167 * netlbl_req_setattr - Label a request socket using the correct protocol
1168 * @req: the request socket to label
1169 * @secattr: the security attributes
1170 *
1171 * Description:
1172 * Attach the correct label to the given socket using the security attributes
1173 * specified in @secattr. Returns zero on success, negative values on failure.
1174 *
1175 */
1176int netlbl_req_setattr(struct request_sock *req,
1177 const struct netlbl_lsm_secattr *secattr)
1178{
1179 int ret_val;
1180 struct netlbl_dommap_def *entry;
1181 struct inet_request_sock *ireq = inet_rsk(req);
1182
1183 rcu_read_lock();
1184 switch (req->rsk_ops->family) {
1185 case AF_INET:
1186 entry = netlbl_domhsh_getentry_af4(secattr->domain,
1187 ireq->ir_rmt_addr);
1188 if (entry == NULL) {
1189 ret_val = -ENOENT;
1190 goto req_setattr_return;
1191 }
1192 switch (entry->type) {
1193 case NETLBL_NLTYPE_CIPSOV4:
1194 ret_val = cipso_v4_req_setattr(req,
1195 entry->cipso, secattr);
1196 break;
1197 case NETLBL_NLTYPE_UNLABELED:
1198 netlbl_req_delattr(req);
1199 ret_val = 0;
1200 break;
1201 default:
1202 ret_val = -ENOENT;
1203 }
1204 break;
1205#if IS_ENABLED(CONFIG_IPV6)
1206 case AF_INET6:
1207 entry = netlbl_domhsh_getentry_af6(secattr->domain,
1208 &ireq->ir_v6_rmt_addr);
1209 if (entry == NULL) {
1210 ret_val = -ENOENT;
1211 goto req_setattr_return;
1212 }
1213 switch (entry->type) {
1214 case NETLBL_NLTYPE_CALIPSO:
1215 ret_val = calipso_req_setattr(req,
1216 entry->calipso, secattr);
1217 break;
1218 case NETLBL_NLTYPE_UNLABELED:
1219 netlbl_req_delattr(req);
1220 ret_val = 0;
1221 break;
1222 default:
1223 ret_val = -ENOENT;
1224 }
1225 break;
1226#endif /* IPv6 */
1227 default:
1228 ret_val = -EPROTONOSUPPORT;
1229 }
1230
1231req_setattr_return:
1232 rcu_read_unlock();
1233 return ret_val;
1234}
1235
1236/**
1237* netlbl_req_delattr - Delete all the NetLabel labels on a socket
1238* @req: the socket
1239*
1240* Description:
1241* Remove all the NetLabel labeling from @req.
1242*
1243*/
1244void netlbl_req_delattr(struct request_sock *req)
1245{
1246 switch (req->rsk_ops->family) {
1247 case AF_INET:
1248 cipso_v4_req_delattr(req);
1249 break;
1250#if IS_ENABLED(CONFIG_IPV6)
1251 case AF_INET6:
1252 calipso_req_delattr(req);
1253 break;
1254#endif /* IPv6 */
1255 }
1256}
1257
1258/**
1259 * netlbl_skbuff_setattr - Label a packet using the correct protocol
1260 * @skb: the packet
1261 * @family: protocol family
1262 * @secattr: the security attributes
1263 *
1264 * Description:
1265 * Attach the correct label to the given packet using the security attributes
1266 * specified in @secattr. Returns zero on success, negative values on failure.
1267 *
1268 */
1269int netlbl_skbuff_setattr(struct sk_buff *skb,
1270 u16 family,
1271 const struct netlbl_lsm_secattr *secattr)
1272{
1273 int ret_val;
1274 struct iphdr *hdr4;
1275#if IS_ENABLED(CONFIG_IPV6)
1276 struct ipv6hdr *hdr6;
1277#endif
1278 struct netlbl_dommap_def *entry;
1279
1280 rcu_read_lock();
1281 switch (family) {
1282 case AF_INET:
1283 hdr4 = ip_hdr(skb);
1284 entry = netlbl_domhsh_getentry_af4(secattr->domain,
1285 hdr4->daddr);
1286 if (entry == NULL) {
1287 ret_val = -ENOENT;
1288 goto skbuff_setattr_return;
1289 }
1290 switch (entry->type) {
1291 case NETLBL_NLTYPE_CIPSOV4:
1292 ret_val = cipso_v4_skbuff_setattr(skb, entry->cipso,
1293 secattr);
1294 break;
1295 case NETLBL_NLTYPE_UNLABELED:
1296 /* just delete the protocols we support for right now
1297 * but we could remove other protocols if needed */
1298 ret_val = cipso_v4_skbuff_delattr(skb);
1299 break;
1300 default:
1301 ret_val = -ENOENT;
1302 }
1303 break;
1304#if IS_ENABLED(CONFIG_IPV6)
1305 case AF_INET6:
1306 hdr6 = ipv6_hdr(skb);
1307 entry = netlbl_domhsh_getentry_af6(secattr->domain,
1308 &hdr6->daddr);
1309 if (entry == NULL) {
1310 ret_val = -ENOENT;
1311 goto skbuff_setattr_return;
1312 }
1313 switch (entry->type) {
1314 case NETLBL_NLTYPE_CALIPSO:
1315 ret_val = calipso_skbuff_setattr(skb, entry->calipso,
1316 secattr);
1317 break;
1318 case NETLBL_NLTYPE_UNLABELED:
1319 /* just delete the protocols we support for right now
1320 * but we could remove other protocols if needed */
1321 ret_val = calipso_skbuff_delattr(skb);
1322 break;
1323 default:
1324 ret_val = -ENOENT;
1325 }
1326 break;
1327#endif /* IPv6 */
1328 default:
1329 ret_val = -EPROTONOSUPPORT;
1330 }
1331
1332skbuff_setattr_return:
1333 rcu_read_unlock();
1334 return ret_val;
1335}
1336
1337/**
1338 * netlbl_skbuff_getattr - Determine the security attributes of a packet
1339 * @skb: the packet
1340 * @family: protocol family
1341 * @secattr: the security attributes
1342 *
1343 * Description:
1344 * Examines the given packet to see if a recognized form of packet labeling
1345 * is present, if so it parses the packet label and returns the security
1346 * attributes in @secattr. Returns zero on success, negative values on
1347 * failure.
1348 *
1349 */
1350int netlbl_skbuff_getattr(const struct sk_buff *skb,
1351 u16 family,
1352 struct netlbl_lsm_secattr *secattr)
1353{
1354 unsigned char *ptr;
1355
1356 switch (family) {
1357 case AF_INET:
1358 ptr = cipso_v4_optptr(skb);
1359 if (ptr && cipso_v4_getattr(ptr, secattr) == 0)
1360 return 0;
1361 break;
1362#if IS_ENABLED(CONFIG_IPV6)
1363 case AF_INET6:
1364 ptr = calipso_optptr(skb);
1365 if (ptr && calipso_getattr(ptr, secattr) == 0)
1366 return 0;
1367 break;
1368#endif /* IPv6 */
1369 }
1370
1371 return netlbl_unlabel_getattr(skb, family, secattr);
1372}
1373
1374/**
1375 * netlbl_skbuff_err - Handle a LSM error on a sk_buff
1376 * @skb: the packet
1377 * @family: the family
1378 * @error: the error code
1379 * @gateway: true if host is acting as a gateway, false otherwise
1380 *
1381 * Description:
1382 * Deal with a LSM problem when handling the packet in @skb, typically this is
1383 * a permission denied problem (-EACCES). The correct action is determined
1384 * according to the packet's labeling protocol.
1385 *
1386 */
1387void netlbl_skbuff_err(struct sk_buff *skb, u16 family, int error, int gateway)
1388{
1389 switch (family) {
1390 case AF_INET:
1391 if (cipso_v4_optptr(skb))
1392 cipso_v4_error(skb, error, gateway);
1393 break;
1394 }
1395}
1396
1397/**
1398 * netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches
1399 *
1400 * Description:
1401 * For all of the NetLabel protocols that support some form of label mapping
1402 * cache, invalidate the cache. Returns zero on success, negative values on
1403 * error.
1404 *
1405 */
1406void netlbl_cache_invalidate(void)
1407{
1408 cipso_v4_cache_invalidate();
1409#if IS_ENABLED(CONFIG_IPV6)
1410 calipso_cache_invalidate();
1411#endif /* IPv6 */
1412}
1413
1414/**
1415 * netlbl_cache_add - Add an entry to a NetLabel protocol cache
1416 * @skb: the packet
1417 * @family: the family
1418 * @secattr: the packet's security attributes
1419 *
1420 * Description:
1421 * Add the LSM security attributes for the given packet to the underlying
1422 * NetLabel protocol's label mapping cache. Returns zero on success, negative
1423 * values on error.
1424 *
1425 */
1426int netlbl_cache_add(const struct sk_buff *skb, u16 family,
1427 const struct netlbl_lsm_secattr *secattr)
1428{
1429 unsigned char *ptr;
1430
1431 if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0)
1432 return -ENOMSG;
1433
1434 switch (family) {
1435 case AF_INET:
1436 ptr = cipso_v4_optptr(skb);
1437 if (ptr)
1438 return cipso_v4_cache_add(ptr, secattr);
1439 break;
1440#if IS_ENABLED(CONFIG_IPV6)
1441 case AF_INET6:
1442 ptr = calipso_optptr(skb);
1443 if (ptr)
1444 return calipso_cache_add(ptr, secattr);
1445 break;
1446#endif /* IPv6 */
1447 }
1448 return -ENOMSG;
1449}
1450
1451/*
1452 * Protocol Engine Functions
1453 */
1454
1455/**
1456 * netlbl_audit_start - Start an audit message
1457 * @type: audit message type
1458 * @audit_info: NetLabel audit information
1459 *
1460 * Description:
1461 * Start an audit message using the type specified in @type and fill the audit
1462 * message with some fields common to all NetLabel audit messages. This
1463 * function should only be used by protocol engines, not LSMs. Returns a
1464 * pointer to the audit buffer on success, NULL on failure.
1465 *
1466 */
1467struct audit_buffer *netlbl_audit_start(int type,
1468 struct netlbl_audit *audit_info)
1469{
1470 return netlbl_audit_start_common(type, audit_info);
1471}
1472EXPORT_SYMBOL(netlbl_audit_start);
1473
1474/*
1475 * Setup Functions
1476 */
1477
1478/**
1479 * netlbl_init - Initialize NetLabel
1480 *
1481 * Description:
1482 * Perform the required NetLabel initialization before first use.
1483 *
1484 */
1485static int __init netlbl_init(void)
1486{
1487 int ret_val;
1488
1489 printk(KERN_INFO "NetLabel: Initializing\n");
1490 printk(KERN_INFO "NetLabel: domain hash size = %u\n",
1491 (1 << NETLBL_DOMHSH_BITSIZE));
1492 printk(KERN_INFO "NetLabel: protocols = UNLABELED CIPSOv4 CALIPSO\n");
1493
1494 ret_val = netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE);
1495 if (ret_val != 0)
1496 goto init_failure;
1497
1498 ret_val = netlbl_unlabel_init(NETLBL_UNLHSH_BITSIZE);
1499 if (ret_val != 0)
1500 goto init_failure;
1501
1502 ret_val = netlbl_netlink_init();
1503 if (ret_val != 0)
1504 goto init_failure;
1505
1506 ret_val = netlbl_unlabel_defconf();
1507 if (ret_val != 0)
1508 goto init_failure;
1509 printk(KERN_INFO "NetLabel: unlabeled traffic allowed by default\n");
1510
1511 return 0;
1512
1513init_failure:
1514 panic("NetLabel: failed to initialize properly (%d)\n", ret_val);
1515}
1516
1517subsys_initcall(netlbl_init);