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1/*
2 * NetLabel Kernel API
3 *
4 * This file defines the kernel API for the NetLabel system. The NetLabel
5 * system manages static and dynamic label mappings for network protocols such
6 * as CIPSO and RIPSO.
7 *
8 * Author: Paul Moore <paul@paul-moore.com>
9 *
10 */
11
12/*
13 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008
14 *
15 * This program is free software; you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License as published by
17 * the Free Software Foundation; either version 2 of the License, or
18 * (at your option) any later version.
19 *
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
23 * the GNU General Public License for more details.
24 *
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
28 *
29 */
30
31#include <linux/init.h>
32#include <linux/types.h>
33#include <linux/slab.h>
34#include <linux/audit.h>
35#include <linux/in.h>
36#include <linux/in6.h>
37#include <net/ip.h>
38#include <net/ipv6.h>
39#include <net/netlabel.h>
40#include <net/cipso_ipv4.h>
41#include <asm/bug.h>
42#include <linux/atomic.h>
43
44#include "netlabel_domainhash.h"
45#include "netlabel_unlabeled.h"
46#include "netlabel_cipso_v4.h"
47#include "netlabel_user.h"
48#include "netlabel_mgmt.h"
49#include "netlabel_addrlist.h"
50
51/*
52 * Configuration Functions
53 */
54
55/**
56 * netlbl_cfg_map_del - Remove a NetLabel/LSM domain mapping
57 * @domain: the domain mapping to remove
58 * @family: address family
59 * @addr: IP address
60 * @mask: IP address mask
61 * @audit_info: NetLabel audit information
62 *
63 * Description:
64 * Removes a NetLabel/LSM domain mapping. A @domain value of NULL causes the
65 * default domain mapping to be removed. Returns zero on success, negative
66 * values on failure.
67 *
68 */
69int netlbl_cfg_map_del(const char *domain,
70 u16 family,
71 const void *addr,
72 const void *mask,
73 struct netlbl_audit *audit_info)
74{
75 if (addr == NULL && mask == NULL) {
76 return netlbl_domhsh_remove(domain, audit_info);
77 } else if (addr != NULL && mask != NULL) {
78 switch (family) {
79 case AF_INET:
80 return netlbl_domhsh_remove_af4(domain, addr, mask,
81 audit_info);
82 default:
83 return -EPFNOSUPPORT;
84 }
85 } else
86 return -EINVAL;
87}
88
89/**
90 * netlbl_cfg_unlbl_map_add - Add a new unlabeled mapping
91 * @domain: the domain mapping to add
92 * @family: address family
93 * @addr: IP address
94 * @mask: IP address mask
95 * @audit_info: NetLabel audit information
96 *
97 * Description:
98 * Adds a new unlabeled NetLabel/LSM domain mapping. A @domain value of NULL
99 * causes a new default domain mapping to be added. Returns zero on success,
100 * negative values on failure.
101 *
102 */
103int netlbl_cfg_unlbl_map_add(const char *domain,
104 u16 family,
105 const void *addr,
106 const void *mask,
107 struct netlbl_audit *audit_info)
108{
109 int ret_val = -ENOMEM;
110 struct netlbl_dom_map *entry;
111 struct netlbl_domaddr_map *addrmap = NULL;
112 struct netlbl_domaddr4_map *map4 = NULL;
113 struct netlbl_domaddr6_map *map6 = NULL;
114 const struct in_addr *addr4, *mask4;
115 const struct in6_addr *addr6, *mask6;
116
117 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
118 if (entry == NULL)
119 return -ENOMEM;
120 if (domain != NULL) {
121 entry->domain = kstrdup(domain, GFP_ATOMIC);
122 if (entry->domain == NULL)
123 goto cfg_unlbl_map_add_failure;
124 }
125
126 if (addr == NULL && mask == NULL)
127 entry->type = NETLBL_NLTYPE_UNLABELED;
128 else if (addr != NULL && mask != NULL) {
129 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
130 if (addrmap == NULL)
131 goto cfg_unlbl_map_add_failure;
132 INIT_LIST_HEAD(&addrmap->list4);
133 INIT_LIST_HEAD(&addrmap->list6);
134
135 switch (family) {
136 case AF_INET:
137 addr4 = addr;
138 mask4 = mask;
139 map4 = kzalloc(sizeof(*map4), GFP_ATOMIC);
140 if (map4 == NULL)
141 goto cfg_unlbl_map_add_failure;
142 map4->type = NETLBL_NLTYPE_UNLABELED;
143 map4->list.addr = addr4->s_addr & mask4->s_addr;
144 map4->list.mask = mask4->s_addr;
145 map4->list.valid = 1;
146 ret_val = netlbl_af4list_add(&map4->list,
147 &addrmap->list4);
148 if (ret_val != 0)
149 goto cfg_unlbl_map_add_failure;
150 break;
151 case AF_INET6:
152 addr6 = addr;
153 mask6 = mask;
154 map6 = kzalloc(sizeof(*map6), GFP_ATOMIC);
155 if (map6 == NULL)
156 goto cfg_unlbl_map_add_failure;
157 map6->type = NETLBL_NLTYPE_UNLABELED;
158 ipv6_addr_copy(&map6->list.addr, addr6);
159 map6->list.addr.s6_addr32[0] &= mask6->s6_addr32[0];
160 map6->list.addr.s6_addr32[1] &= mask6->s6_addr32[1];
161 map6->list.addr.s6_addr32[2] &= mask6->s6_addr32[2];
162 map6->list.addr.s6_addr32[3] &= mask6->s6_addr32[3];
163 ipv6_addr_copy(&map6->list.mask, mask6);
164 map6->list.valid = 1;
165 ret_val = netlbl_af4list_add(&map4->list,
166 &addrmap->list4);
167 if (ret_val != 0)
168 goto cfg_unlbl_map_add_failure;
169 break;
170 default:
171 goto cfg_unlbl_map_add_failure;
172 break;
173 }
174
175 entry->type_def.addrsel = addrmap;
176 entry->type = NETLBL_NLTYPE_ADDRSELECT;
177 } else {
178 ret_val = -EINVAL;
179 goto cfg_unlbl_map_add_failure;
180 }
181
182 ret_val = netlbl_domhsh_add(entry, audit_info);
183 if (ret_val != 0)
184 goto cfg_unlbl_map_add_failure;
185
186 return 0;
187
188cfg_unlbl_map_add_failure:
189 kfree(entry->domain);
190 kfree(entry);
191 kfree(addrmap);
192 kfree(map4);
193 kfree(map6);
194 return ret_val;
195}
196
197
198/**
199 * netlbl_cfg_unlbl_static_add - Adds a new static label
200 * @net: network namespace
201 * @dev_name: interface name
202 * @addr: IP address in network byte order (struct in[6]_addr)
203 * @mask: address mask in network byte order (struct in[6]_addr)
204 * @family: address family
205 * @secid: LSM secid value for the entry
206 * @audit_info: NetLabel audit information
207 *
208 * Description:
209 * Adds a new NetLabel static label to be used when protocol provided labels
210 * are not present on incoming traffic. If @dev_name is NULL then the default
211 * interface will be used. Returns zero on success, negative values on failure.
212 *
213 */
214int netlbl_cfg_unlbl_static_add(struct net *net,
215 const char *dev_name,
216 const void *addr,
217 const void *mask,
218 u16 family,
219 u32 secid,
220 struct netlbl_audit *audit_info)
221{
222 u32 addr_len;
223
224 switch (family) {
225 case AF_INET:
226 addr_len = sizeof(struct in_addr);
227 break;
228 case AF_INET6:
229 addr_len = sizeof(struct in6_addr);
230 break;
231 default:
232 return -EPFNOSUPPORT;
233 }
234
235 return netlbl_unlhsh_add(net,
236 dev_name, addr, mask, addr_len,
237 secid, audit_info);
238}
239
240/**
241 * netlbl_cfg_unlbl_static_del - Removes an existing static label
242 * @net: network namespace
243 * @dev_name: interface name
244 * @addr: IP address in network byte order (struct in[6]_addr)
245 * @mask: address mask in network byte order (struct in[6]_addr)
246 * @family: address family
247 * @secid: LSM secid value for the entry
248 * @audit_info: NetLabel audit information
249 *
250 * Description:
251 * Removes an existing NetLabel static label used when protocol provided labels
252 * are not present on incoming traffic. If @dev_name is NULL then the default
253 * interface will be used. Returns zero on success, negative values on failure.
254 *
255 */
256int netlbl_cfg_unlbl_static_del(struct net *net,
257 const char *dev_name,
258 const void *addr,
259 const void *mask,
260 u16 family,
261 struct netlbl_audit *audit_info)
262{
263 u32 addr_len;
264
265 switch (family) {
266 case AF_INET:
267 addr_len = sizeof(struct in_addr);
268 break;
269 case AF_INET6:
270 addr_len = sizeof(struct in6_addr);
271 break;
272 default:
273 return -EPFNOSUPPORT;
274 }
275
276 return netlbl_unlhsh_remove(net,
277 dev_name, addr, mask, addr_len,
278 audit_info);
279}
280
281/**
282 * netlbl_cfg_cipsov4_add - Add a new CIPSOv4 DOI definition
283 * @doi_def: CIPSO DOI definition
284 * @audit_info: NetLabel audit information
285 *
286 * Description:
287 * Add a new CIPSO DOI definition as defined by @doi_def. Returns zero on
288 * success and negative values on failure.
289 *
290 */
291int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def,
292 struct netlbl_audit *audit_info)
293{
294 return cipso_v4_doi_add(doi_def, audit_info);
295}
296
297/**
298 * netlbl_cfg_cipsov4_del - Remove an existing CIPSOv4 DOI definition
299 * @doi: CIPSO DOI
300 * @audit_info: NetLabel audit information
301 *
302 * Description:
303 * Remove an existing CIPSO DOI definition matching @doi. Returns zero on
304 * success and negative values on failure.
305 *
306 */
307void netlbl_cfg_cipsov4_del(u32 doi, struct netlbl_audit *audit_info)
308{
309 cipso_v4_doi_remove(doi, audit_info);
310}
311
312/**
313 * netlbl_cfg_cipsov4_map_add - Add a new CIPSOv4 DOI mapping
314 * @doi: the CIPSO DOI
315 * @domain: the domain mapping to add
316 * @addr: IP address
317 * @mask: IP address mask
318 * @audit_info: NetLabel audit information
319 *
320 * Description:
321 * Add a new NetLabel/LSM domain mapping for the given CIPSO DOI to the NetLabel
322 * subsystem. A @domain value of NULL adds a new default domain mapping.
323 * Returns zero on success, negative values on failure.
324 *
325 */
326int netlbl_cfg_cipsov4_map_add(u32 doi,
327 const char *domain,
328 const struct in_addr *addr,
329 const struct in_addr *mask,
330 struct netlbl_audit *audit_info)
331{
332 int ret_val = -ENOMEM;
333 struct cipso_v4_doi *doi_def;
334 struct netlbl_dom_map *entry;
335 struct netlbl_domaddr_map *addrmap = NULL;
336 struct netlbl_domaddr4_map *addrinfo = NULL;
337
338 doi_def = cipso_v4_doi_getdef(doi);
339 if (doi_def == NULL)
340 return -ENOENT;
341
342 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
343 if (entry == NULL)
344 goto out_entry;
345 if (domain != NULL) {
346 entry->domain = kstrdup(domain, GFP_ATOMIC);
347 if (entry->domain == NULL)
348 goto out_domain;
349 }
350
351 if (addr == NULL && mask == NULL) {
352 entry->type_def.cipsov4 = doi_def;
353 entry->type = NETLBL_NLTYPE_CIPSOV4;
354 } else if (addr != NULL && mask != NULL) {
355 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
356 if (addrmap == NULL)
357 goto out_addrmap;
358 INIT_LIST_HEAD(&addrmap->list4);
359 INIT_LIST_HEAD(&addrmap->list6);
360
361 addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC);
362 if (addrinfo == NULL)
363 goto out_addrinfo;
364 addrinfo->type_def.cipsov4 = doi_def;
365 addrinfo->type = NETLBL_NLTYPE_CIPSOV4;
366 addrinfo->list.addr = addr->s_addr & mask->s_addr;
367 addrinfo->list.mask = mask->s_addr;
368 addrinfo->list.valid = 1;
369 ret_val = netlbl_af4list_add(&addrinfo->list, &addrmap->list4);
370 if (ret_val != 0)
371 goto cfg_cipsov4_map_add_failure;
372
373 entry->type_def.addrsel = addrmap;
374 entry->type = NETLBL_NLTYPE_ADDRSELECT;
375 } else {
376 ret_val = -EINVAL;
377 goto out_addrmap;
378 }
379
380 ret_val = netlbl_domhsh_add(entry, audit_info);
381 if (ret_val != 0)
382 goto cfg_cipsov4_map_add_failure;
383
384 return 0;
385
386cfg_cipsov4_map_add_failure:
387 kfree(addrinfo);
388out_addrinfo:
389 kfree(addrmap);
390out_addrmap:
391 kfree(entry->domain);
392out_domain:
393 kfree(entry);
394out_entry:
395 cipso_v4_doi_putdef(doi_def);
396 return ret_val;
397}
398
399/*
400 * Security Attribute Functions
401 */
402
403/**
404 * netlbl_secattr_catmap_walk - Walk a LSM secattr catmap looking for a bit
405 * @catmap: the category bitmap
406 * @offset: the offset to start searching at, in bits
407 *
408 * Description:
409 * This function walks a LSM secattr category bitmap starting at @offset and
410 * returns the spot of the first set bit or -ENOENT if no bits are set.
411 *
412 */
413int netlbl_secattr_catmap_walk(struct netlbl_lsm_secattr_catmap *catmap,
414 u32 offset)
415{
416 struct netlbl_lsm_secattr_catmap *iter = catmap;
417 u32 node_idx;
418 u32 node_bit;
419 NETLBL_CATMAP_MAPTYPE bitmap;
420
421 if (offset > iter->startbit) {
422 while (offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
423 iter = iter->next;
424 if (iter == NULL)
425 return -ENOENT;
426 }
427 node_idx = (offset - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
428 node_bit = offset - iter->startbit -
429 (NETLBL_CATMAP_MAPSIZE * node_idx);
430 } else {
431 node_idx = 0;
432 node_bit = 0;
433 }
434 bitmap = iter->bitmap[node_idx] >> node_bit;
435
436 for (;;) {
437 if (bitmap != 0) {
438 while ((bitmap & NETLBL_CATMAP_BIT) == 0) {
439 bitmap >>= 1;
440 node_bit++;
441 }
442 return iter->startbit +
443 (NETLBL_CATMAP_MAPSIZE * node_idx) + node_bit;
444 }
445 if (++node_idx >= NETLBL_CATMAP_MAPCNT) {
446 if (iter->next != NULL) {
447 iter = iter->next;
448 node_idx = 0;
449 } else
450 return -ENOENT;
451 }
452 bitmap = iter->bitmap[node_idx];
453 node_bit = 0;
454 }
455
456 return -ENOENT;
457}
458
459/**
460 * netlbl_secattr_catmap_walk_rng - Find the end of a string of set bits
461 * @catmap: the category bitmap
462 * @offset: the offset to start searching at, in bits
463 *
464 * Description:
465 * This function walks a LSM secattr category bitmap starting at @offset and
466 * returns the spot of the first cleared bit or -ENOENT if the offset is past
467 * the end of the bitmap.
468 *
469 */
470int netlbl_secattr_catmap_walk_rng(struct netlbl_lsm_secattr_catmap *catmap,
471 u32 offset)
472{
473 struct netlbl_lsm_secattr_catmap *iter = catmap;
474 u32 node_idx;
475 u32 node_bit;
476 NETLBL_CATMAP_MAPTYPE bitmask;
477 NETLBL_CATMAP_MAPTYPE bitmap;
478
479 if (offset > iter->startbit) {
480 while (offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
481 iter = iter->next;
482 if (iter == NULL)
483 return -ENOENT;
484 }
485 node_idx = (offset - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
486 node_bit = offset - iter->startbit -
487 (NETLBL_CATMAP_MAPSIZE * node_idx);
488 } else {
489 node_idx = 0;
490 node_bit = 0;
491 }
492 bitmask = NETLBL_CATMAP_BIT << node_bit;
493
494 for (;;) {
495 bitmap = iter->bitmap[node_idx];
496 while (bitmask != 0 && (bitmap & bitmask) != 0) {
497 bitmask <<= 1;
498 node_bit++;
499 }
500
501 if (bitmask != 0)
502 return iter->startbit +
503 (NETLBL_CATMAP_MAPSIZE * node_idx) +
504 node_bit - 1;
505 else if (++node_idx >= NETLBL_CATMAP_MAPCNT) {
506 if (iter->next == NULL)
507 return iter->startbit + NETLBL_CATMAP_SIZE - 1;
508 iter = iter->next;
509 node_idx = 0;
510 }
511 bitmask = NETLBL_CATMAP_BIT;
512 node_bit = 0;
513 }
514
515 return -ENOENT;
516}
517
518/**
519 * netlbl_secattr_catmap_setbit - Set a bit in a LSM secattr catmap
520 * @catmap: the category bitmap
521 * @bit: the bit to set
522 * @flags: memory allocation flags
523 *
524 * Description:
525 * Set the bit specified by @bit in @catmap. Returns zero on success,
526 * negative values on failure.
527 *
528 */
529int netlbl_secattr_catmap_setbit(struct netlbl_lsm_secattr_catmap *catmap,
530 u32 bit,
531 gfp_t flags)
532{
533 struct netlbl_lsm_secattr_catmap *iter = catmap;
534 u32 node_bit;
535 u32 node_idx;
536
537 while (iter->next != NULL &&
538 bit >= (iter->startbit + NETLBL_CATMAP_SIZE))
539 iter = iter->next;
540 if (bit >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
541 iter->next = netlbl_secattr_catmap_alloc(flags);
542 if (iter->next == NULL)
543 return -ENOMEM;
544 iter = iter->next;
545 iter->startbit = bit & ~(NETLBL_CATMAP_SIZE - 1);
546 }
547
548 /* gcc always rounds to zero when doing integer division */
549 node_idx = (bit - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
550 node_bit = bit - iter->startbit - (NETLBL_CATMAP_MAPSIZE * node_idx);
551 iter->bitmap[node_idx] |= NETLBL_CATMAP_BIT << node_bit;
552
553 return 0;
554}
555
556/**
557 * netlbl_secattr_catmap_setrng - Set a range of bits in a LSM secattr catmap
558 * @catmap: the category bitmap
559 * @start: the starting bit
560 * @end: the last bit in the string
561 * @flags: memory allocation flags
562 *
563 * Description:
564 * Set a range of bits, starting at @start and ending with @end. Returns zero
565 * on success, negative values on failure.
566 *
567 */
568int netlbl_secattr_catmap_setrng(struct netlbl_lsm_secattr_catmap *catmap,
569 u32 start,
570 u32 end,
571 gfp_t flags)
572{
573 int ret_val = 0;
574 struct netlbl_lsm_secattr_catmap *iter = catmap;
575 u32 iter_max_spot;
576 u32 spot;
577
578 /* XXX - This could probably be made a bit faster by combining writes
579 * to the catmap instead of setting a single bit each time, but for
580 * right now skipping to the start of the range in the catmap should
581 * be a nice improvement over calling the individual setbit function
582 * repeatedly from a loop. */
583
584 while (iter->next != NULL &&
585 start >= (iter->startbit + NETLBL_CATMAP_SIZE))
586 iter = iter->next;
587 iter_max_spot = iter->startbit + NETLBL_CATMAP_SIZE;
588
589 for (spot = start; spot <= end && ret_val == 0; spot++) {
590 if (spot >= iter_max_spot && iter->next != NULL) {
591 iter = iter->next;
592 iter_max_spot = iter->startbit + NETLBL_CATMAP_SIZE;
593 }
594 ret_val = netlbl_secattr_catmap_setbit(iter, spot, GFP_ATOMIC);
595 }
596
597 return ret_val;
598}
599
600/*
601 * LSM Functions
602 */
603
604/**
605 * netlbl_enabled - Determine if the NetLabel subsystem is enabled
606 *
607 * Description:
608 * The LSM can use this function to determine if it should use NetLabel
609 * security attributes in it's enforcement mechanism. Currently, NetLabel is
610 * considered to be enabled when it's configuration contains a valid setup for
611 * at least one labeled protocol (i.e. NetLabel can understand incoming
612 * labeled packets of at least one type); otherwise NetLabel is considered to
613 * be disabled.
614 *
615 */
616int netlbl_enabled(void)
617{
618 /* At some point we probably want to expose this mechanism to the user
619 * as well so that admins can toggle NetLabel regardless of the
620 * configuration */
621 return (atomic_read(&netlabel_mgmt_protocount) > 0);
622}
623
624/**
625 * netlbl_sock_setattr - Label a socket using the correct protocol
626 * @sk: the socket to label
627 * @family: protocol family
628 * @secattr: the security attributes
629 *
630 * Description:
631 * Attach the correct label to the given socket using the security attributes
632 * specified in @secattr. This function requires exclusive access to @sk,
633 * which means it either needs to be in the process of being created or locked.
634 * Returns zero on success, -EDESTADDRREQ if the domain is configured to use
635 * network address selectors (can't blindly label the socket), and negative
636 * values on all other failures.
637 *
638 */
639int netlbl_sock_setattr(struct sock *sk,
640 u16 family,
641 const struct netlbl_lsm_secattr *secattr)
642{
643 int ret_val;
644 struct netlbl_dom_map *dom_entry;
645
646 rcu_read_lock();
647 dom_entry = netlbl_domhsh_getentry(secattr->domain);
648 if (dom_entry == NULL) {
649 ret_val = -ENOENT;
650 goto socket_setattr_return;
651 }
652 switch (family) {
653 case AF_INET:
654 switch (dom_entry->type) {
655 case NETLBL_NLTYPE_ADDRSELECT:
656 ret_val = -EDESTADDRREQ;
657 break;
658 case NETLBL_NLTYPE_CIPSOV4:
659 ret_val = cipso_v4_sock_setattr(sk,
660 dom_entry->type_def.cipsov4,
661 secattr);
662 break;
663 case NETLBL_NLTYPE_UNLABELED:
664 ret_val = 0;
665 break;
666 default:
667 ret_val = -ENOENT;
668 }
669 break;
670#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
671 case AF_INET6:
672 /* since we don't support any IPv6 labeling protocols right
673 * now we can optimize everything away until we do */
674 ret_val = 0;
675 break;
676#endif /* IPv6 */
677 default:
678 ret_val = -EPROTONOSUPPORT;
679 }
680
681socket_setattr_return:
682 rcu_read_unlock();
683 return ret_val;
684}
685
686/**
687 * netlbl_sock_delattr - Delete all the NetLabel labels on a socket
688 * @sk: the socket
689 *
690 * Description:
691 * Remove all the NetLabel labeling from @sk. The caller is responsible for
692 * ensuring that @sk is locked.
693 *
694 */
695void netlbl_sock_delattr(struct sock *sk)
696{
697 cipso_v4_sock_delattr(sk);
698}
699
700/**
701 * netlbl_sock_getattr - Determine the security attributes of a sock
702 * @sk: the sock
703 * @secattr: the security attributes
704 *
705 * Description:
706 * Examines the given sock to see if any NetLabel style labeling has been
707 * applied to the sock, if so it parses the socket label and returns the
708 * security attributes in @secattr. Returns zero on success, negative values
709 * on failure.
710 *
711 */
712int netlbl_sock_getattr(struct sock *sk,
713 struct netlbl_lsm_secattr *secattr)
714{
715 int ret_val;
716
717 switch (sk->sk_family) {
718 case AF_INET:
719 ret_val = cipso_v4_sock_getattr(sk, secattr);
720 break;
721#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
722 case AF_INET6:
723 ret_val = -ENOMSG;
724 break;
725#endif /* IPv6 */
726 default:
727 ret_val = -EPROTONOSUPPORT;
728 }
729
730 return ret_val;
731}
732
733/**
734 * netlbl_conn_setattr - Label a connected socket using the correct protocol
735 * @sk: the socket to label
736 * @addr: the destination address
737 * @secattr: the security attributes
738 *
739 * Description:
740 * Attach the correct label to the given connected socket using the security
741 * attributes specified in @secattr. The caller is responsible for ensuring
742 * that @sk is locked. Returns zero on success, negative values on failure.
743 *
744 */
745int netlbl_conn_setattr(struct sock *sk,
746 struct sockaddr *addr,
747 const struct netlbl_lsm_secattr *secattr)
748{
749 int ret_val;
750 struct sockaddr_in *addr4;
751 struct netlbl_domaddr4_map *af4_entry;
752
753 rcu_read_lock();
754 switch (addr->sa_family) {
755 case AF_INET:
756 addr4 = (struct sockaddr_in *)addr;
757 af4_entry = netlbl_domhsh_getentry_af4(secattr->domain,
758 addr4->sin_addr.s_addr);
759 if (af4_entry == NULL) {
760 ret_val = -ENOENT;
761 goto conn_setattr_return;
762 }
763 switch (af4_entry->type) {
764 case NETLBL_NLTYPE_CIPSOV4:
765 ret_val = cipso_v4_sock_setattr(sk,
766 af4_entry->type_def.cipsov4,
767 secattr);
768 break;
769 case NETLBL_NLTYPE_UNLABELED:
770 /* just delete the protocols we support for right now
771 * but we could remove other protocols if needed */
772 cipso_v4_sock_delattr(sk);
773 ret_val = 0;
774 break;
775 default:
776 ret_val = -ENOENT;
777 }
778 break;
779#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
780 case AF_INET6:
781 /* since we don't support any IPv6 labeling protocols right
782 * now we can optimize everything away until we do */
783 ret_val = 0;
784 break;
785#endif /* IPv6 */
786 default:
787 ret_val = -EPROTONOSUPPORT;
788 }
789
790conn_setattr_return:
791 rcu_read_unlock();
792 return ret_val;
793}
794
795/**
796 * netlbl_req_setattr - Label a request socket using the correct protocol
797 * @req: the request socket to label
798 * @secattr: the security attributes
799 *
800 * Description:
801 * Attach the correct label to the given socket using the security attributes
802 * specified in @secattr. Returns zero on success, negative values on failure.
803 *
804 */
805int netlbl_req_setattr(struct request_sock *req,
806 const struct netlbl_lsm_secattr *secattr)
807{
808 int ret_val;
809 struct netlbl_dom_map *dom_entry;
810 struct netlbl_domaddr4_map *af4_entry;
811 u32 proto_type;
812 struct cipso_v4_doi *proto_cv4;
813
814 rcu_read_lock();
815 dom_entry = netlbl_domhsh_getentry(secattr->domain);
816 if (dom_entry == NULL) {
817 ret_val = -ENOENT;
818 goto req_setattr_return;
819 }
820 switch (req->rsk_ops->family) {
821 case AF_INET:
822 if (dom_entry->type == NETLBL_NLTYPE_ADDRSELECT) {
823 struct inet_request_sock *req_inet = inet_rsk(req);
824 af4_entry = netlbl_domhsh_getentry_af4(secattr->domain,
825 req_inet->rmt_addr);
826 if (af4_entry == NULL) {
827 ret_val = -ENOENT;
828 goto req_setattr_return;
829 }
830 proto_type = af4_entry->type;
831 proto_cv4 = af4_entry->type_def.cipsov4;
832 } else {
833 proto_type = dom_entry->type;
834 proto_cv4 = dom_entry->type_def.cipsov4;
835 }
836 switch (proto_type) {
837 case NETLBL_NLTYPE_CIPSOV4:
838 ret_val = cipso_v4_req_setattr(req, proto_cv4, secattr);
839 break;
840 case NETLBL_NLTYPE_UNLABELED:
841 /* just delete the protocols we support for right now
842 * but we could remove other protocols if needed */
843 cipso_v4_req_delattr(req);
844 ret_val = 0;
845 break;
846 default:
847 ret_val = -ENOENT;
848 }
849 break;
850#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
851 case AF_INET6:
852 /* since we don't support any IPv6 labeling protocols right
853 * now we can optimize everything away until we do */
854 ret_val = 0;
855 break;
856#endif /* IPv6 */
857 default:
858 ret_val = -EPROTONOSUPPORT;
859 }
860
861req_setattr_return:
862 rcu_read_unlock();
863 return ret_val;
864}
865
866/**
867* netlbl_req_delattr - Delete all the NetLabel labels on a socket
868* @req: the socket
869*
870* Description:
871* Remove all the NetLabel labeling from @req.
872*
873*/
874void netlbl_req_delattr(struct request_sock *req)
875{
876 cipso_v4_req_delattr(req);
877}
878
879/**
880 * netlbl_skbuff_setattr - Label a packet using the correct protocol
881 * @skb: the packet
882 * @family: protocol family
883 * @secattr: the security attributes
884 *
885 * Description:
886 * Attach the correct label to the given packet using the security attributes
887 * specified in @secattr. Returns zero on success, negative values on failure.
888 *
889 */
890int netlbl_skbuff_setattr(struct sk_buff *skb,
891 u16 family,
892 const struct netlbl_lsm_secattr *secattr)
893{
894 int ret_val;
895 struct iphdr *hdr4;
896 struct netlbl_domaddr4_map *af4_entry;
897
898 rcu_read_lock();
899 switch (family) {
900 case AF_INET:
901 hdr4 = ip_hdr(skb);
902 af4_entry = netlbl_domhsh_getentry_af4(secattr->domain,
903 hdr4->daddr);
904 if (af4_entry == NULL) {
905 ret_val = -ENOENT;
906 goto skbuff_setattr_return;
907 }
908 switch (af4_entry->type) {
909 case NETLBL_NLTYPE_CIPSOV4:
910 ret_val = cipso_v4_skbuff_setattr(skb,
911 af4_entry->type_def.cipsov4,
912 secattr);
913 break;
914 case NETLBL_NLTYPE_UNLABELED:
915 /* just delete the protocols we support for right now
916 * but we could remove other protocols if needed */
917 ret_val = cipso_v4_skbuff_delattr(skb);
918 break;
919 default:
920 ret_val = -ENOENT;
921 }
922 break;
923#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
924 case AF_INET6:
925 /* since we don't support any IPv6 labeling protocols right
926 * now we can optimize everything away until we do */
927 ret_val = 0;
928 break;
929#endif /* IPv6 */
930 default:
931 ret_val = -EPROTONOSUPPORT;
932 }
933
934skbuff_setattr_return:
935 rcu_read_unlock();
936 return ret_val;
937}
938
939/**
940 * netlbl_skbuff_getattr - Determine the security attributes of a packet
941 * @skb: the packet
942 * @family: protocol family
943 * @secattr: the security attributes
944 *
945 * Description:
946 * Examines the given packet to see if a recognized form of packet labeling
947 * is present, if so it parses the packet label and returns the security
948 * attributes in @secattr. Returns zero on success, negative values on
949 * failure.
950 *
951 */
952int netlbl_skbuff_getattr(const struct sk_buff *skb,
953 u16 family,
954 struct netlbl_lsm_secattr *secattr)
955{
956 switch (family) {
957 case AF_INET:
958 if (CIPSO_V4_OPTEXIST(skb) &&
959 cipso_v4_skbuff_getattr(skb, secattr) == 0)
960 return 0;
961 break;
962#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
963 case AF_INET6:
964 break;
965#endif /* IPv6 */
966 }
967
968 return netlbl_unlabel_getattr(skb, family, secattr);
969}
970
971/**
972 * netlbl_skbuff_err - Handle a LSM error on a sk_buff
973 * @skb: the packet
974 * @error: the error code
975 * @gateway: true if host is acting as a gateway, false otherwise
976 *
977 * Description:
978 * Deal with a LSM problem when handling the packet in @skb, typically this is
979 * a permission denied problem (-EACCES). The correct action is determined
980 * according to the packet's labeling protocol.
981 *
982 */
983void netlbl_skbuff_err(struct sk_buff *skb, int error, int gateway)
984{
985 if (CIPSO_V4_OPTEXIST(skb))
986 cipso_v4_error(skb, error, gateway);
987}
988
989/**
990 * netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches
991 *
992 * Description:
993 * For all of the NetLabel protocols that support some form of label mapping
994 * cache, invalidate the cache. Returns zero on success, negative values on
995 * error.
996 *
997 */
998void netlbl_cache_invalidate(void)
999{
1000 cipso_v4_cache_invalidate();
1001}
1002
1003/**
1004 * netlbl_cache_add - Add an entry to a NetLabel protocol cache
1005 * @skb: the packet
1006 * @secattr: the packet's security attributes
1007 *
1008 * Description:
1009 * Add the LSM security attributes for the given packet to the underlying
1010 * NetLabel protocol's label mapping cache. Returns zero on success, negative
1011 * values on error.
1012 *
1013 */
1014int netlbl_cache_add(const struct sk_buff *skb,
1015 const struct netlbl_lsm_secattr *secattr)
1016{
1017 if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0)
1018 return -ENOMSG;
1019
1020 if (CIPSO_V4_OPTEXIST(skb))
1021 return cipso_v4_cache_add(skb, secattr);
1022
1023 return -ENOMSG;
1024}
1025
1026/*
1027 * Protocol Engine Functions
1028 */
1029
1030/**
1031 * netlbl_audit_start - Start an audit message
1032 * @type: audit message type
1033 * @audit_info: NetLabel audit information
1034 *
1035 * Description:
1036 * Start an audit message using the type specified in @type and fill the audit
1037 * message with some fields common to all NetLabel audit messages. This
1038 * function should only be used by protocol engines, not LSMs. Returns a
1039 * pointer to the audit buffer on success, NULL on failure.
1040 *
1041 */
1042struct audit_buffer *netlbl_audit_start(int type,
1043 struct netlbl_audit *audit_info)
1044{
1045 return netlbl_audit_start_common(type, audit_info);
1046}
1047
1048/*
1049 * Setup Functions
1050 */
1051
1052/**
1053 * netlbl_init - Initialize NetLabel
1054 *
1055 * Description:
1056 * Perform the required NetLabel initialization before first use.
1057 *
1058 */
1059static int __init netlbl_init(void)
1060{
1061 int ret_val;
1062
1063 printk(KERN_INFO "NetLabel: Initializing\n");
1064 printk(KERN_INFO "NetLabel: domain hash size = %u\n",
1065 (1 << NETLBL_DOMHSH_BITSIZE));
1066 printk(KERN_INFO "NetLabel: protocols ="
1067 " UNLABELED"
1068 " CIPSOv4"
1069 "\n");
1070
1071 ret_val = netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE);
1072 if (ret_val != 0)
1073 goto init_failure;
1074
1075 ret_val = netlbl_unlabel_init(NETLBL_UNLHSH_BITSIZE);
1076 if (ret_val != 0)
1077 goto init_failure;
1078
1079 ret_val = netlbl_netlink_init();
1080 if (ret_val != 0)
1081 goto init_failure;
1082
1083 ret_val = netlbl_unlabel_defconf();
1084 if (ret_val != 0)
1085 goto init_failure;
1086 printk(KERN_INFO "NetLabel: unlabeled traffic allowed by default\n");
1087
1088 return 0;
1089
1090init_failure:
1091 panic("NetLabel: failed to initialize properly (%d)\n", ret_val);
1092}
1093
1094subsys_initcall(netlbl_init);
1/*
2 * NetLabel Kernel API
3 *
4 * This file defines the kernel API for the NetLabel system. The NetLabel
5 * system manages static and dynamic label mappings for network protocols such
6 * as CIPSO and RIPSO.
7 *
8 * Author: Paul Moore <paul@paul-moore.com>
9 *
10 */
11
12/*
13 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008
14 *
15 * This program is free software; you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License as published by
17 * the Free Software Foundation; either version 2 of the License, or
18 * (at your option) any later version.
19 *
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
23 * the GNU General Public License for more details.
24 *
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, see <http://www.gnu.org/licenses/>.
27 *
28 */
29
30#include <linux/init.h>
31#include <linux/types.h>
32#include <linux/slab.h>
33#include <linux/audit.h>
34#include <linux/in.h>
35#include <linux/in6.h>
36#include <net/ip.h>
37#include <net/ipv6.h>
38#include <net/netlabel.h>
39#include <net/cipso_ipv4.h>
40#include <asm/bug.h>
41#include <linux/atomic.h>
42
43#include "netlabel_domainhash.h"
44#include "netlabel_unlabeled.h"
45#include "netlabel_cipso_v4.h"
46#include "netlabel_user.h"
47#include "netlabel_mgmt.h"
48#include "netlabel_addrlist.h"
49
50/*
51 * Configuration Functions
52 */
53
54/**
55 * netlbl_cfg_map_del - Remove a NetLabel/LSM domain mapping
56 * @domain: the domain mapping to remove
57 * @family: address family
58 * @addr: IP address
59 * @mask: IP address mask
60 * @audit_info: NetLabel audit information
61 *
62 * Description:
63 * Removes a NetLabel/LSM domain mapping. A @domain value of NULL causes the
64 * default domain mapping to be removed. Returns zero on success, negative
65 * values on failure.
66 *
67 */
68int netlbl_cfg_map_del(const char *domain,
69 u16 family,
70 const void *addr,
71 const void *mask,
72 struct netlbl_audit *audit_info)
73{
74 if (addr == NULL && mask == NULL) {
75 return netlbl_domhsh_remove(domain, audit_info);
76 } else if (addr != NULL && mask != NULL) {
77 switch (family) {
78 case AF_INET:
79 return netlbl_domhsh_remove_af4(domain, addr, mask,
80 audit_info);
81 default:
82 return -EPFNOSUPPORT;
83 }
84 } else
85 return -EINVAL;
86}
87
88/**
89 * netlbl_cfg_unlbl_map_add - Add a new unlabeled mapping
90 * @domain: the domain mapping to add
91 * @family: address family
92 * @addr: IP address
93 * @mask: IP address mask
94 * @audit_info: NetLabel audit information
95 *
96 * Description:
97 * Adds a new unlabeled NetLabel/LSM domain mapping. A @domain value of NULL
98 * causes a new default domain mapping to be added. Returns zero on success,
99 * negative values on failure.
100 *
101 */
102int netlbl_cfg_unlbl_map_add(const char *domain,
103 u16 family,
104 const void *addr,
105 const void *mask,
106 struct netlbl_audit *audit_info)
107{
108 int ret_val = -ENOMEM;
109 struct netlbl_dom_map *entry;
110 struct netlbl_domaddr_map *addrmap = NULL;
111 struct netlbl_domaddr4_map *map4 = NULL;
112 struct netlbl_domaddr6_map *map6 = NULL;
113
114 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
115 if (entry == NULL)
116 return -ENOMEM;
117 if (domain != NULL) {
118 entry->domain = kstrdup(domain, GFP_ATOMIC);
119 if (entry->domain == NULL)
120 goto cfg_unlbl_map_add_failure;
121 }
122
123 if (addr == NULL && mask == NULL)
124 entry->def.type = NETLBL_NLTYPE_UNLABELED;
125 else if (addr != NULL && mask != NULL) {
126 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
127 if (addrmap == NULL)
128 goto cfg_unlbl_map_add_failure;
129 INIT_LIST_HEAD(&addrmap->list4);
130 INIT_LIST_HEAD(&addrmap->list6);
131
132 switch (family) {
133 case AF_INET: {
134 const struct in_addr *addr4 = addr;
135 const struct in_addr *mask4 = mask;
136 map4 = kzalloc(sizeof(*map4), GFP_ATOMIC);
137 if (map4 == NULL)
138 goto cfg_unlbl_map_add_failure;
139 map4->def.type = NETLBL_NLTYPE_UNLABELED;
140 map4->list.addr = addr4->s_addr & mask4->s_addr;
141 map4->list.mask = mask4->s_addr;
142 map4->list.valid = 1;
143 ret_val = netlbl_af4list_add(&map4->list,
144 &addrmap->list4);
145 if (ret_val != 0)
146 goto cfg_unlbl_map_add_failure;
147 break;
148 }
149#if IS_ENABLED(CONFIG_IPV6)
150 case AF_INET6: {
151 const struct in6_addr *addr6 = addr;
152 const struct in6_addr *mask6 = mask;
153 map6 = kzalloc(sizeof(*map6), GFP_ATOMIC);
154 if (map6 == NULL)
155 goto cfg_unlbl_map_add_failure;
156 map6->def.type = NETLBL_NLTYPE_UNLABELED;
157 map6->list.addr = *addr6;
158 map6->list.addr.s6_addr32[0] &= mask6->s6_addr32[0];
159 map6->list.addr.s6_addr32[1] &= mask6->s6_addr32[1];
160 map6->list.addr.s6_addr32[2] &= mask6->s6_addr32[2];
161 map6->list.addr.s6_addr32[3] &= mask6->s6_addr32[3];
162 map6->list.mask = *mask6;
163 map6->list.valid = 1;
164 ret_val = netlbl_af6list_add(&map6->list,
165 &addrmap->list6);
166 if (ret_val != 0)
167 goto cfg_unlbl_map_add_failure;
168 break;
169 }
170#endif /* IPv6 */
171 default:
172 goto cfg_unlbl_map_add_failure;
173 break;
174 }
175
176 entry->def.addrsel = addrmap;
177 entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
178 } else {
179 ret_val = -EINVAL;
180 goto cfg_unlbl_map_add_failure;
181 }
182
183 ret_val = netlbl_domhsh_add(entry, audit_info);
184 if (ret_val != 0)
185 goto cfg_unlbl_map_add_failure;
186
187 return 0;
188
189cfg_unlbl_map_add_failure:
190 kfree(entry->domain);
191 kfree(entry);
192 kfree(addrmap);
193 kfree(map4);
194 kfree(map6);
195 return ret_val;
196}
197
198
199/**
200 * netlbl_cfg_unlbl_static_add - Adds a new static label
201 * @net: network namespace
202 * @dev_name: interface name
203 * @addr: IP address in network byte order (struct in[6]_addr)
204 * @mask: address mask in network byte order (struct in[6]_addr)
205 * @family: address family
206 * @secid: LSM secid value for the entry
207 * @audit_info: NetLabel audit information
208 *
209 * Description:
210 * Adds a new NetLabel static label to be used when protocol provided labels
211 * are not present on incoming traffic. If @dev_name is NULL then the default
212 * interface will be used. Returns zero on success, negative values on failure.
213 *
214 */
215int netlbl_cfg_unlbl_static_add(struct net *net,
216 const char *dev_name,
217 const void *addr,
218 const void *mask,
219 u16 family,
220 u32 secid,
221 struct netlbl_audit *audit_info)
222{
223 u32 addr_len;
224
225 switch (family) {
226 case AF_INET:
227 addr_len = sizeof(struct in_addr);
228 break;
229#if IS_ENABLED(CONFIG_IPV6)
230 case AF_INET6:
231 addr_len = sizeof(struct in6_addr);
232 break;
233#endif /* IPv6 */
234 default:
235 return -EPFNOSUPPORT;
236 }
237
238 return netlbl_unlhsh_add(net,
239 dev_name, addr, mask, addr_len,
240 secid, audit_info);
241}
242
243/**
244 * netlbl_cfg_unlbl_static_del - Removes an existing static label
245 * @net: network namespace
246 * @dev_name: interface name
247 * @addr: IP address in network byte order (struct in[6]_addr)
248 * @mask: address mask in network byte order (struct in[6]_addr)
249 * @family: address family
250 * @secid: LSM secid value for the entry
251 * @audit_info: NetLabel audit information
252 *
253 * Description:
254 * Removes an existing NetLabel static label used when protocol provided labels
255 * are not present on incoming traffic. If @dev_name is NULL then the default
256 * interface will be used. Returns zero on success, negative values on failure.
257 *
258 */
259int netlbl_cfg_unlbl_static_del(struct net *net,
260 const char *dev_name,
261 const void *addr,
262 const void *mask,
263 u16 family,
264 struct netlbl_audit *audit_info)
265{
266 u32 addr_len;
267
268 switch (family) {
269 case AF_INET:
270 addr_len = sizeof(struct in_addr);
271 break;
272#if IS_ENABLED(CONFIG_IPV6)
273 case AF_INET6:
274 addr_len = sizeof(struct in6_addr);
275 break;
276#endif /* IPv6 */
277 default:
278 return -EPFNOSUPPORT;
279 }
280
281 return netlbl_unlhsh_remove(net,
282 dev_name, addr, mask, addr_len,
283 audit_info);
284}
285
286/**
287 * netlbl_cfg_cipsov4_add - Add a new CIPSOv4 DOI definition
288 * @doi_def: CIPSO DOI definition
289 * @audit_info: NetLabel audit information
290 *
291 * Description:
292 * Add a new CIPSO DOI definition as defined by @doi_def. Returns zero on
293 * success and negative values on failure.
294 *
295 */
296int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def,
297 struct netlbl_audit *audit_info)
298{
299 return cipso_v4_doi_add(doi_def, audit_info);
300}
301
302/**
303 * netlbl_cfg_cipsov4_del - Remove an existing CIPSOv4 DOI definition
304 * @doi: CIPSO DOI
305 * @audit_info: NetLabel audit information
306 *
307 * Description:
308 * Remove an existing CIPSO DOI definition matching @doi. Returns zero on
309 * success and negative values on failure.
310 *
311 */
312void netlbl_cfg_cipsov4_del(u32 doi, struct netlbl_audit *audit_info)
313{
314 cipso_v4_doi_remove(doi, audit_info);
315}
316
317/**
318 * netlbl_cfg_cipsov4_map_add - Add a new CIPSOv4 DOI mapping
319 * @doi: the CIPSO DOI
320 * @domain: the domain mapping to add
321 * @addr: IP address
322 * @mask: IP address mask
323 * @audit_info: NetLabel audit information
324 *
325 * Description:
326 * Add a new NetLabel/LSM domain mapping for the given CIPSO DOI to the NetLabel
327 * subsystem. A @domain value of NULL adds a new default domain mapping.
328 * Returns zero on success, negative values on failure.
329 *
330 */
331int netlbl_cfg_cipsov4_map_add(u32 doi,
332 const char *domain,
333 const struct in_addr *addr,
334 const struct in_addr *mask,
335 struct netlbl_audit *audit_info)
336{
337 int ret_val = -ENOMEM;
338 struct cipso_v4_doi *doi_def;
339 struct netlbl_dom_map *entry;
340 struct netlbl_domaddr_map *addrmap = NULL;
341 struct netlbl_domaddr4_map *addrinfo = NULL;
342
343 doi_def = cipso_v4_doi_getdef(doi);
344 if (doi_def == NULL)
345 return -ENOENT;
346
347 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
348 if (entry == NULL)
349 goto out_entry;
350 if (domain != NULL) {
351 entry->domain = kstrdup(domain, GFP_ATOMIC);
352 if (entry->domain == NULL)
353 goto out_domain;
354 }
355
356 if (addr == NULL && mask == NULL) {
357 entry->def.cipso = doi_def;
358 entry->def.type = NETLBL_NLTYPE_CIPSOV4;
359 } else if (addr != NULL && mask != NULL) {
360 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
361 if (addrmap == NULL)
362 goto out_addrmap;
363 INIT_LIST_HEAD(&addrmap->list4);
364 INIT_LIST_HEAD(&addrmap->list6);
365
366 addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC);
367 if (addrinfo == NULL)
368 goto out_addrinfo;
369 addrinfo->def.cipso = doi_def;
370 addrinfo->def.type = NETLBL_NLTYPE_CIPSOV4;
371 addrinfo->list.addr = addr->s_addr & mask->s_addr;
372 addrinfo->list.mask = mask->s_addr;
373 addrinfo->list.valid = 1;
374 ret_val = netlbl_af4list_add(&addrinfo->list, &addrmap->list4);
375 if (ret_val != 0)
376 goto cfg_cipsov4_map_add_failure;
377
378 entry->def.addrsel = addrmap;
379 entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
380 } else {
381 ret_val = -EINVAL;
382 goto out_addrmap;
383 }
384
385 ret_val = netlbl_domhsh_add(entry, audit_info);
386 if (ret_val != 0)
387 goto cfg_cipsov4_map_add_failure;
388
389 return 0;
390
391cfg_cipsov4_map_add_failure:
392 kfree(addrinfo);
393out_addrinfo:
394 kfree(addrmap);
395out_addrmap:
396 kfree(entry->domain);
397out_domain:
398 kfree(entry);
399out_entry:
400 cipso_v4_doi_putdef(doi_def);
401 return ret_val;
402}
403
404/*
405 * Security Attribute Functions
406 */
407
408/**
409 * netlbl_secattr_catmap_walk - Walk a LSM secattr catmap looking for a bit
410 * @catmap: the category bitmap
411 * @offset: the offset to start searching at, in bits
412 *
413 * Description:
414 * This function walks a LSM secattr category bitmap starting at @offset and
415 * returns the spot of the first set bit or -ENOENT if no bits are set.
416 *
417 */
418int netlbl_secattr_catmap_walk(struct netlbl_lsm_secattr_catmap *catmap,
419 u32 offset)
420{
421 struct netlbl_lsm_secattr_catmap *iter = catmap;
422 u32 node_idx;
423 u32 node_bit;
424 NETLBL_CATMAP_MAPTYPE bitmap;
425
426 if (offset > iter->startbit) {
427 while (offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
428 iter = iter->next;
429 if (iter == NULL)
430 return -ENOENT;
431 }
432 node_idx = (offset - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
433 node_bit = offset - iter->startbit -
434 (NETLBL_CATMAP_MAPSIZE * node_idx);
435 } else {
436 node_idx = 0;
437 node_bit = 0;
438 }
439 bitmap = iter->bitmap[node_idx] >> node_bit;
440
441 for (;;) {
442 if (bitmap != 0) {
443 while ((bitmap & NETLBL_CATMAP_BIT) == 0) {
444 bitmap >>= 1;
445 node_bit++;
446 }
447 return iter->startbit +
448 (NETLBL_CATMAP_MAPSIZE * node_idx) + node_bit;
449 }
450 if (++node_idx >= NETLBL_CATMAP_MAPCNT) {
451 if (iter->next != NULL) {
452 iter = iter->next;
453 node_idx = 0;
454 } else
455 return -ENOENT;
456 }
457 bitmap = iter->bitmap[node_idx];
458 node_bit = 0;
459 }
460
461 return -ENOENT;
462}
463
464/**
465 * netlbl_secattr_catmap_walk_rng - Find the end of a string of set bits
466 * @catmap: the category bitmap
467 * @offset: the offset to start searching at, in bits
468 *
469 * Description:
470 * This function walks a LSM secattr category bitmap starting at @offset and
471 * returns the spot of the first cleared bit or -ENOENT if the offset is past
472 * the end of the bitmap.
473 *
474 */
475int netlbl_secattr_catmap_walk_rng(struct netlbl_lsm_secattr_catmap *catmap,
476 u32 offset)
477{
478 struct netlbl_lsm_secattr_catmap *iter = catmap;
479 u32 node_idx;
480 u32 node_bit;
481 NETLBL_CATMAP_MAPTYPE bitmask;
482 NETLBL_CATMAP_MAPTYPE bitmap;
483
484 if (offset > iter->startbit) {
485 while (offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
486 iter = iter->next;
487 if (iter == NULL)
488 return -ENOENT;
489 }
490 node_idx = (offset - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
491 node_bit = offset - iter->startbit -
492 (NETLBL_CATMAP_MAPSIZE * node_idx);
493 } else {
494 node_idx = 0;
495 node_bit = 0;
496 }
497 bitmask = NETLBL_CATMAP_BIT << node_bit;
498
499 for (;;) {
500 bitmap = iter->bitmap[node_idx];
501 while (bitmask != 0 && (bitmap & bitmask) != 0) {
502 bitmask <<= 1;
503 node_bit++;
504 }
505
506 if (bitmask != 0)
507 return iter->startbit +
508 (NETLBL_CATMAP_MAPSIZE * node_idx) +
509 node_bit - 1;
510 else if (++node_idx >= NETLBL_CATMAP_MAPCNT) {
511 if (iter->next == NULL)
512 return iter->startbit + NETLBL_CATMAP_SIZE - 1;
513 iter = iter->next;
514 node_idx = 0;
515 }
516 bitmask = NETLBL_CATMAP_BIT;
517 node_bit = 0;
518 }
519
520 return -ENOENT;
521}
522
523/**
524 * netlbl_secattr_catmap_setbit - Set a bit in a LSM secattr catmap
525 * @catmap: the category bitmap
526 * @bit: the bit to set
527 * @flags: memory allocation flags
528 *
529 * Description:
530 * Set the bit specified by @bit in @catmap. Returns zero on success,
531 * negative values on failure.
532 *
533 */
534int netlbl_secattr_catmap_setbit(struct netlbl_lsm_secattr_catmap *catmap,
535 u32 bit,
536 gfp_t flags)
537{
538 struct netlbl_lsm_secattr_catmap *iter = catmap;
539 u32 node_bit;
540 u32 node_idx;
541
542 while (iter->next != NULL &&
543 bit >= (iter->startbit + NETLBL_CATMAP_SIZE))
544 iter = iter->next;
545 if (bit >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
546 iter->next = netlbl_secattr_catmap_alloc(flags);
547 if (iter->next == NULL)
548 return -ENOMEM;
549 iter = iter->next;
550 iter->startbit = bit & ~(NETLBL_CATMAP_SIZE - 1);
551 }
552
553 /* gcc always rounds to zero when doing integer division */
554 node_idx = (bit - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
555 node_bit = bit - iter->startbit - (NETLBL_CATMAP_MAPSIZE * node_idx);
556 iter->bitmap[node_idx] |= NETLBL_CATMAP_BIT << node_bit;
557
558 return 0;
559}
560
561/**
562 * netlbl_secattr_catmap_setrng - Set a range of bits in a LSM secattr catmap
563 * @catmap: the category bitmap
564 * @start: the starting bit
565 * @end: the last bit in the string
566 * @flags: memory allocation flags
567 *
568 * Description:
569 * Set a range of bits, starting at @start and ending with @end. Returns zero
570 * on success, negative values on failure.
571 *
572 */
573int netlbl_secattr_catmap_setrng(struct netlbl_lsm_secattr_catmap *catmap,
574 u32 start,
575 u32 end,
576 gfp_t flags)
577{
578 int ret_val = 0;
579 struct netlbl_lsm_secattr_catmap *iter = catmap;
580 u32 iter_max_spot;
581 u32 spot;
582
583 /* XXX - This could probably be made a bit faster by combining writes
584 * to the catmap instead of setting a single bit each time, but for
585 * right now skipping to the start of the range in the catmap should
586 * be a nice improvement over calling the individual setbit function
587 * repeatedly from a loop. */
588
589 while (iter->next != NULL &&
590 start >= (iter->startbit + NETLBL_CATMAP_SIZE))
591 iter = iter->next;
592 iter_max_spot = iter->startbit + NETLBL_CATMAP_SIZE;
593
594 for (spot = start; spot <= end && ret_val == 0; spot++) {
595 if (spot >= iter_max_spot && iter->next != NULL) {
596 iter = iter->next;
597 iter_max_spot = iter->startbit + NETLBL_CATMAP_SIZE;
598 }
599 ret_val = netlbl_secattr_catmap_setbit(iter, spot, flags);
600 }
601
602 return ret_val;
603}
604
605/*
606 * LSM Functions
607 */
608
609/**
610 * netlbl_enabled - Determine if the NetLabel subsystem is enabled
611 *
612 * Description:
613 * The LSM can use this function to determine if it should use NetLabel
614 * security attributes in it's enforcement mechanism. Currently, NetLabel is
615 * considered to be enabled when it's configuration contains a valid setup for
616 * at least one labeled protocol (i.e. NetLabel can understand incoming
617 * labeled packets of at least one type); otherwise NetLabel is considered to
618 * be disabled.
619 *
620 */
621int netlbl_enabled(void)
622{
623 /* At some point we probably want to expose this mechanism to the user
624 * as well so that admins can toggle NetLabel regardless of the
625 * configuration */
626 return (atomic_read(&netlabel_mgmt_protocount) > 0);
627}
628
629/**
630 * netlbl_sock_setattr - Label a socket using the correct protocol
631 * @sk: the socket to label
632 * @family: protocol family
633 * @secattr: the security attributes
634 *
635 * Description:
636 * Attach the correct label to the given socket using the security attributes
637 * specified in @secattr. This function requires exclusive access to @sk,
638 * which means it either needs to be in the process of being created or locked.
639 * Returns zero on success, -EDESTADDRREQ if the domain is configured to use
640 * network address selectors (can't blindly label the socket), and negative
641 * values on all other failures.
642 *
643 */
644int netlbl_sock_setattr(struct sock *sk,
645 u16 family,
646 const struct netlbl_lsm_secattr *secattr)
647{
648 int ret_val;
649 struct netlbl_dom_map *dom_entry;
650
651 rcu_read_lock();
652 dom_entry = netlbl_domhsh_getentry(secattr->domain);
653 if (dom_entry == NULL) {
654 ret_val = -ENOENT;
655 goto socket_setattr_return;
656 }
657 switch (family) {
658 case AF_INET:
659 switch (dom_entry->def.type) {
660 case NETLBL_NLTYPE_ADDRSELECT:
661 ret_val = -EDESTADDRREQ;
662 break;
663 case NETLBL_NLTYPE_CIPSOV4:
664 ret_val = cipso_v4_sock_setattr(sk,
665 dom_entry->def.cipso,
666 secattr);
667 break;
668 case NETLBL_NLTYPE_UNLABELED:
669 ret_val = 0;
670 break;
671 default:
672 ret_val = -ENOENT;
673 }
674 break;
675#if IS_ENABLED(CONFIG_IPV6)
676 case AF_INET6:
677 /* since we don't support any IPv6 labeling protocols right
678 * now we can optimize everything away until we do */
679 ret_val = 0;
680 break;
681#endif /* IPv6 */
682 default:
683 ret_val = -EPROTONOSUPPORT;
684 }
685
686socket_setattr_return:
687 rcu_read_unlock();
688 return ret_val;
689}
690
691/**
692 * netlbl_sock_delattr - Delete all the NetLabel labels on a socket
693 * @sk: the socket
694 *
695 * Description:
696 * Remove all the NetLabel labeling from @sk. The caller is responsible for
697 * ensuring that @sk is locked.
698 *
699 */
700void netlbl_sock_delattr(struct sock *sk)
701{
702 cipso_v4_sock_delattr(sk);
703}
704
705/**
706 * netlbl_sock_getattr - Determine the security attributes of a sock
707 * @sk: the sock
708 * @secattr: the security attributes
709 *
710 * Description:
711 * Examines the given sock to see if any NetLabel style labeling has been
712 * applied to the sock, if so it parses the socket label and returns the
713 * security attributes in @secattr. Returns zero on success, negative values
714 * on failure.
715 *
716 */
717int netlbl_sock_getattr(struct sock *sk,
718 struct netlbl_lsm_secattr *secattr)
719{
720 int ret_val;
721
722 switch (sk->sk_family) {
723 case AF_INET:
724 ret_val = cipso_v4_sock_getattr(sk, secattr);
725 break;
726#if IS_ENABLED(CONFIG_IPV6)
727 case AF_INET6:
728 ret_val = -ENOMSG;
729 break;
730#endif /* IPv6 */
731 default:
732 ret_val = -EPROTONOSUPPORT;
733 }
734
735 return ret_val;
736}
737
738/**
739 * netlbl_conn_setattr - Label a connected socket using the correct protocol
740 * @sk: the socket to label
741 * @addr: the destination address
742 * @secattr: the security attributes
743 *
744 * Description:
745 * Attach the correct label to the given connected socket using the security
746 * attributes specified in @secattr. The caller is responsible for ensuring
747 * that @sk is locked. Returns zero on success, negative values on failure.
748 *
749 */
750int netlbl_conn_setattr(struct sock *sk,
751 struct sockaddr *addr,
752 const struct netlbl_lsm_secattr *secattr)
753{
754 int ret_val;
755 struct sockaddr_in *addr4;
756 struct netlbl_dommap_def *entry;
757
758 rcu_read_lock();
759 switch (addr->sa_family) {
760 case AF_INET:
761 addr4 = (struct sockaddr_in *)addr;
762 entry = netlbl_domhsh_getentry_af4(secattr->domain,
763 addr4->sin_addr.s_addr);
764 if (entry == NULL) {
765 ret_val = -ENOENT;
766 goto conn_setattr_return;
767 }
768 switch (entry->type) {
769 case NETLBL_NLTYPE_CIPSOV4:
770 ret_val = cipso_v4_sock_setattr(sk,
771 entry->cipso, secattr);
772 break;
773 case NETLBL_NLTYPE_UNLABELED:
774 /* just delete the protocols we support for right now
775 * but we could remove other protocols if needed */
776 cipso_v4_sock_delattr(sk);
777 ret_val = 0;
778 break;
779 default:
780 ret_val = -ENOENT;
781 }
782 break;
783#if IS_ENABLED(CONFIG_IPV6)
784 case AF_INET6:
785 /* since we don't support any IPv6 labeling protocols right
786 * now we can optimize everything away until we do */
787 ret_val = 0;
788 break;
789#endif /* IPv6 */
790 default:
791 ret_val = -EPROTONOSUPPORT;
792 }
793
794conn_setattr_return:
795 rcu_read_unlock();
796 return ret_val;
797}
798
799/**
800 * netlbl_req_setattr - Label a request socket using the correct protocol
801 * @req: the request socket to label
802 * @secattr: the security attributes
803 *
804 * Description:
805 * Attach the correct label to the given socket using the security attributes
806 * specified in @secattr. Returns zero on success, negative values on failure.
807 *
808 */
809int netlbl_req_setattr(struct request_sock *req,
810 const struct netlbl_lsm_secattr *secattr)
811{
812 int ret_val;
813 struct netlbl_dommap_def *entry;
814
815 rcu_read_lock();
816 switch (req->rsk_ops->family) {
817 case AF_INET:
818 entry = netlbl_domhsh_getentry_af4(secattr->domain,
819 inet_rsk(req)->ir_rmt_addr);
820 if (entry == NULL) {
821 ret_val = -ENOENT;
822 goto req_setattr_return;
823 }
824 switch (entry->type) {
825 case NETLBL_NLTYPE_CIPSOV4:
826 ret_val = cipso_v4_req_setattr(req,
827 entry->cipso, secattr);
828 break;
829 case NETLBL_NLTYPE_UNLABELED:
830 /* just delete the protocols we support for right now
831 * but we could remove other protocols if needed */
832 cipso_v4_req_delattr(req);
833 ret_val = 0;
834 break;
835 default:
836 ret_val = -ENOENT;
837 }
838 break;
839#if IS_ENABLED(CONFIG_IPV6)
840 case AF_INET6:
841 /* since we don't support any IPv6 labeling protocols right
842 * now we can optimize everything away until we do */
843 ret_val = 0;
844 break;
845#endif /* IPv6 */
846 default:
847 ret_val = -EPROTONOSUPPORT;
848 }
849
850req_setattr_return:
851 rcu_read_unlock();
852 return ret_val;
853}
854
855/**
856* netlbl_req_delattr - Delete all the NetLabel labels on a socket
857* @req: the socket
858*
859* Description:
860* Remove all the NetLabel labeling from @req.
861*
862*/
863void netlbl_req_delattr(struct request_sock *req)
864{
865 cipso_v4_req_delattr(req);
866}
867
868/**
869 * netlbl_skbuff_setattr - Label a packet using the correct protocol
870 * @skb: the packet
871 * @family: protocol family
872 * @secattr: the security attributes
873 *
874 * Description:
875 * Attach the correct label to the given packet using the security attributes
876 * specified in @secattr. Returns zero on success, negative values on failure.
877 *
878 */
879int netlbl_skbuff_setattr(struct sk_buff *skb,
880 u16 family,
881 const struct netlbl_lsm_secattr *secattr)
882{
883 int ret_val;
884 struct iphdr *hdr4;
885 struct netlbl_dommap_def *entry;
886
887 rcu_read_lock();
888 switch (family) {
889 case AF_INET:
890 hdr4 = ip_hdr(skb);
891 entry = netlbl_domhsh_getentry_af4(secattr->domain,hdr4->daddr);
892 if (entry == NULL) {
893 ret_val = -ENOENT;
894 goto skbuff_setattr_return;
895 }
896 switch (entry->type) {
897 case NETLBL_NLTYPE_CIPSOV4:
898 ret_val = cipso_v4_skbuff_setattr(skb, entry->cipso,
899 secattr);
900 break;
901 case NETLBL_NLTYPE_UNLABELED:
902 /* just delete the protocols we support for right now
903 * but we could remove other protocols if needed */
904 ret_val = cipso_v4_skbuff_delattr(skb);
905 break;
906 default:
907 ret_val = -ENOENT;
908 }
909 break;
910#if IS_ENABLED(CONFIG_IPV6)
911 case AF_INET6:
912 /* since we don't support any IPv6 labeling protocols right
913 * now we can optimize everything away until we do */
914 ret_val = 0;
915 break;
916#endif /* IPv6 */
917 default:
918 ret_val = -EPROTONOSUPPORT;
919 }
920
921skbuff_setattr_return:
922 rcu_read_unlock();
923 return ret_val;
924}
925
926/**
927 * netlbl_skbuff_getattr - Determine the security attributes of a packet
928 * @skb: the packet
929 * @family: protocol family
930 * @secattr: the security attributes
931 *
932 * Description:
933 * Examines the given packet to see if a recognized form of packet labeling
934 * is present, if so it parses the packet label and returns the security
935 * attributes in @secattr. Returns zero on success, negative values on
936 * failure.
937 *
938 */
939int netlbl_skbuff_getattr(const struct sk_buff *skb,
940 u16 family,
941 struct netlbl_lsm_secattr *secattr)
942{
943 switch (family) {
944 case AF_INET:
945 if (CIPSO_V4_OPTEXIST(skb) &&
946 cipso_v4_skbuff_getattr(skb, secattr) == 0)
947 return 0;
948 break;
949#if IS_ENABLED(CONFIG_IPV6)
950 case AF_INET6:
951 break;
952#endif /* IPv6 */
953 }
954
955 return netlbl_unlabel_getattr(skb, family, secattr);
956}
957
958/**
959 * netlbl_skbuff_err - Handle a LSM error on a sk_buff
960 * @skb: the packet
961 * @error: the error code
962 * @gateway: true if host is acting as a gateway, false otherwise
963 *
964 * Description:
965 * Deal with a LSM problem when handling the packet in @skb, typically this is
966 * a permission denied problem (-EACCES). The correct action is determined
967 * according to the packet's labeling protocol.
968 *
969 */
970void netlbl_skbuff_err(struct sk_buff *skb, int error, int gateway)
971{
972 if (CIPSO_V4_OPTEXIST(skb))
973 cipso_v4_error(skb, error, gateway);
974}
975
976/**
977 * netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches
978 *
979 * Description:
980 * For all of the NetLabel protocols that support some form of label mapping
981 * cache, invalidate the cache. Returns zero on success, negative values on
982 * error.
983 *
984 */
985void netlbl_cache_invalidate(void)
986{
987 cipso_v4_cache_invalidate();
988}
989
990/**
991 * netlbl_cache_add - Add an entry to a NetLabel protocol cache
992 * @skb: the packet
993 * @secattr: the packet's security attributes
994 *
995 * Description:
996 * Add the LSM security attributes for the given packet to the underlying
997 * NetLabel protocol's label mapping cache. Returns zero on success, negative
998 * values on error.
999 *
1000 */
1001int netlbl_cache_add(const struct sk_buff *skb,
1002 const struct netlbl_lsm_secattr *secattr)
1003{
1004 if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0)
1005 return -ENOMSG;
1006
1007 if (CIPSO_V4_OPTEXIST(skb))
1008 return cipso_v4_cache_add(skb, secattr);
1009
1010 return -ENOMSG;
1011}
1012
1013/*
1014 * Protocol Engine Functions
1015 */
1016
1017/**
1018 * netlbl_audit_start - Start an audit message
1019 * @type: audit message type
1020 * @audit_info: NetLabel audit information
1021 *
1022 * Description:
1023 * Start an audit message using the type specified in @type and fill the audit
1024 * message with some fields common to all NetLabel audit messages. This
1025 * function should only be used by protocol engines, not LSMs. Returns a
1026 * pointer to the audit buffer on success, NULL on failure.
1027 *
1028 */
1029struct audit_buffer *netlbl_audit_start(int type,
1030 struct netlbl_audit *audit_info)
1031{
1032 return netlbl_audit_start_common(type, audit_info);
1033}
1034
1035/*
1036 * Setup Functions
1037 */
1038
1039/**
1040 * netlbl_init - Initialize NetLabel
1041 *
1042 * Description:
1043 * Perform the required NetLabel initialization before first use.
1044 *
1045 */
1046static int __init netlbl_init(void)
1047{
1048 int ret_val;
1049
1050 printk(KERN_INFO "NetLabel: Initializing\n");
1051 printk(KERN_INFO "NetLabel: domain hash size = %u\n",
1052 (1 << NETLBL_DOMHSH_BITSIZE));
1053 printk(KERN_INFO "NetLabel: protocols ="
1054 " UNLABELED"
1055 " CIPSOv4"
1056 "\n");
1057
1058 ret_val = netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE);
1059 if (ret_val != 0)
1060 goto init_failure;
1061
1062 ret_val = netlbl_unlabel_init(NETLBL_UNLHSH_BITSIZE);
1063 if (ret_val != 0)
1064 goto init_failure;
1065
1066 ret_val = netlbl_netlink_init();
1067 if (ret_val != 0)
1068 goto init_failure;
1069
1070 ret_val = netlbl_unlabel_defconf();
1071 if (ret_val != 0)
1072 goto init_failure;
1073 printk(KERN_INFO "NetLabel: unlabeled traffic allowed by default\n");
1074
1075 return 0;
1076
1077init_failure:
1078 panic("NetLabel: failed to initialize properly (%d)\n", ret_val);
1079}
1080
1081subsys_initcall(netlbl_init);