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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, 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 <net/calipso.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_calipso.h"
48#include "netlabel_user.h"
49#include "netlabel_mgmt.h"
50#include "netlabel_addrlist.h"
51
52/*
53 * Configuration Functions
54 */
55
56/**
57 * netlbl_cfg_map_del - Remove a NetLabel/LSM domain mapping
58 * @domain: the domain mapping to remove
59 * @family: address family
60 * @addr: IP address
61 * @mask: IP address mask
62 * @audit_info: NetLabel audit information
63 *
64 * Description:
65 * Removes a NetLabel/LSM domain mapping. A @domain value of NULL causes the
66 * default domain mapping to be removed. Returns zero on success, negative
67 * values on failure.
68 *
69 */
70int netlbl_cfg_map_del(const char *domain,
71 u16 family,
72 const void *addr,
73 const void *mask,
74 struct netlbl_audit *audit_info)
75{
76 if (addr == NULL && mask == NULL) {
77 return netlbl_domhsh_remove(domain, family, audit_info);
78 } else if (addr != NULL && mask != NULL) {
79 switch (family) {
80 case AF_INET:
81 return netlbl_domhsh_remove_af4(domain, addr, mask,
82 audit_info);
83#if IS_ENABLED(CONFIG_IPV6)
84 case AF_INET6:
85 return netlbl_domhsh_remove_af6(domain, addr, mask,
86 audit_info);
87#endif /* IPv6 */
88 default:
89 return -EPFNOSUPPORT;
90 }
91 } else
92 return -EINVAL;
93}
94
95/**
96 * netlbl_cfg_unlbl_map_add - Add a new unlabeled mapping
97 * @domain: the domain mapping to add
98 * @family: address family
99 * @addr: IP address
100 * @mask: IP address mask
101 * @audit_info: NetLabel audit information
102 *
103 * Description:
104 * Adds a new unlabeled NetLabel/LSM domain mapping. A @domain value of NULL
105 * causes a new default domain mapping to be added. Returns zero on success,
106 * negative values on failure.
107 *
108 */
109int netlbl_cfg_unlbl_map_add(const char *domain,
110 u16 family,
111 const void *addr,
112 const void *mask,
113 struct netlbl_audit *audit_info)
114{
115 int ret_val = -ENOMEM;
116 struct netlbl_dom_map *entry;
117 struct netlbl_domaddr_map *addrmap = NULL;
118 struct netlbl_domaddr4_map *map4 = NULL;
119 struct netlbl_domaddr6_map *map6 = NULL;
120
121 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
122 if (entry == NULL)
123 return -ENOMEM;
124 if (domain != NULL) {
125 entry->domain = kstrdup(domain, GFP_ATOMIC);
126 if (entry->domain == NULL)
127 goto cfg_unlbl_map_add_failure;
128 }
129 entry->family = family;
130
131 if (addr == NULL && mask == NULL)
132 entry->def.type = NETLBL_NLTYPE_UNLABELED;
133 else if (addr != NULL && mask != NULL) {
134 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
135 if (addrmap == NULL)
136 goto cfg_unlbl_map_add_failure;
137 INIT_LIST_HEAD(&addrmap->list4);
138 INIT_LIST_HEAD(&addrmap->list6);
139
140 switch (family) {
141 case AF_INET: {
142 const struct in_addr *addr4 = addr;
143 const struct in_addr *mask4 = mask;
144 map4 = kzalloc(sizeof(*map4), GFP_ATOMIC);
145 if (map4 == NULL)
146 goto cfg_unlbl_map_add_failure;
147 map4->def.type = NETLBL_NLTYPE_UNLABELED;
148 map4->list.addr = addr4->s_addr & mask4->s_addr;
149 map4->list.mask = mask4->s_addr;
150 map4->list.valid = 1;
151 ret_val = netlbl_af4list_add(&map4->list,
152 &addrmap->list4);
153 if (ret_val != 0)
154 goto cfg_unlbl_map_add_failure;
155 break;
156 }
157#if IS_ENABLED(CONFIG_IPV6)
158 case AF_INET6: {
159 const struct in6_addr *addr6 = addr;
160 const struct in6_addr *mask6 = mask;
161 map6 = kzalloc(sizeof(*map6), GFP_ATOMIC);
162 if (map6 == NULL)
163 goto cfg_unlbl_map_add_failure;
164 map6->def.type = NETLBL_NLTYPE_UNLABELED;
165 map6->list.addr = *addr6;
166 map6->list.addr.s6_addr32[0] &= mask6->s6_addr32[0];
167 map6->list.addr.s6_addr32[1] &= mask6->s6_addr32[1];
168 map6->list.addr.s6_addr32[2] &= mask6->s6_addr32[2];
169 map6->list.addr.s6_addr32[3] &= mask6->s6_addr32[3];
170 map6->list.mask = *mask6;
171 map6->list.valid = 1;
172 ret_val = netlbl_af6list_add(&map6->list,
173 &addrmap->list6);
174 if (ret_val != 0)
175 goto cfg_unlbl_map_add_failure;
176 break;
177 }
178#endif /* IPv6 */
179 default:
180 goto cfg_unlbl_map_add_failure;
181 }
182
183 entry->def.addrsel = addrmap;
184 entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
185 } else {
186 ret_val = -EINVAL;
187 goto cfg_unlbl_map_add_failure;
188 }
189
190 ret_val = netlbl_domhsh_add(entry, audit_info);
191 if (ret_val != 0)
192 goto cfg_unlbl_map_add_failure;
193
194 return 0;
195
196cfg_unlbl_map_add_failure:
197 kfree(entry->domain);
198 kfree(entry);
199 kfree(addrmap);
200 kfree(map4);
201 kfree(map6);
202 return ret_val;
203}
204
205
206/**
207 * netlbl_cfg_unlbl_static_add - Adds a new static label
208 * @net: network namespace
209 * @dev_name: interface name
210 * @addr: IP address in network byte order (struct in[6]_addr)
211 * @mask: address mask in network byte order (struct in[6]_addr)
212 * @family: address family
213 * @secid: LSM secid value for the entry
214 * @audit_info: NetLabel audit information
215 *
216 * Description:
217 * Adds a new NetLabel static label to be used when protocol provided labels
218 * are not present on incoming traffic. If @dev_name is NULL then the default
219 * interface will be used. Returns zero on success, negative values on failure.
220 *
221 */
222int netlbl_cfg_unlbl_static_add(struct net *net,
223 const char *dev_name,
224 const void *addr,
225 const void *mask,
226 u16 family,
227 u32 secid,
228 struct netlbl_audit *audit_info)
229{
230 u32 addr_len;
231
232 switch (family) {
233 case AF_INET:
234 addr_len = sizeof(struct in_addr);
235 break;
236#if IS_ENABLED(CONFIG_IPV6)
237 case AF_INET6:
238 addr_len = sizeof(struct in6_addr);
239 break;
240#endif /* IPv6 */
241 default:
242 return -EPFNOSUPPORT;
243 }
244
245 return netlbl_unlhsh_add(net,
246 dev_name, addr, mask, addr_len,
247 secid, audit_info);
248}
249
250/**
251 * netlbl_cfg_unlbl_static_del - Removes an existing static label
252 * @net: network namespace
253 * @dev_name: interface name
254 * @addr: IP address in network byte order (struct in[6]_addr)
255 * @mask: address mask in network byte order (struct in[6]_addr)
256 * @family: address family
257 * @audit_info: NetLabel audit information
258 *
259 * Description:
260 * Removes an existing NetLabel static label used when protocol provided labels
261 * are not present on incoming traffic. If @dev_name is NULL then the default
262 * interface will be used. Returns zero on success, negative values on failure.
263 *
264 */
265int netlbl_cfg_unlbl_static_del(struct net *net,
266 const char *dev_name,
267 const void *addr,
268 const void *mask,
269 u16 family,
270 struct netlbl_audit *audit_info)
271{
272 u32 addr_len;
273
274 switch (family) {
275 case AF_INET:
276 addr_len = sizeof(struct in_addr);
277 break;
278#if IS_ENABLED(CONFIG_IPV6)
279 case AF_INET6:
280 addr_len = sizeof(struct in6_addr);
281 break;
282#endif /* IPv6 */
283 default:
284 return -EPFNOSUPPORT;
285 }
286
287 return netlbl_unlhsh_remove(net,
288 dev_name, addr, mask, addr_len,
289 audit_info);
290}
291
292/**
293 * netlbl_cfg_cipsov4_add - Add a new CIPSOv4 DOI definition
294 * @doi_def: CIPSO DOI definition
295 * @audit_info: NetLabel audit information
296 *
297 * Description:
298 * Add a new CIPSO DOI definition as defined by @doi_def. Returns zero on
299 * success and negative values on failure.
300 *
301 */
302int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def,
303 struct netlbl_audit *audit_info)
304{
305 return cipso_v4_doi_add(doi_def, audit_info);
306}
307
308/**
309 * netlbl_cfg_cipsov4_del - Remove an existing CIPSOv4 DOI definition
310 * @doi: CIPSO DOI
311 * @audit_info: NetLabel audit information
312 *
313 * Description:
314 * Remove an existing CIPSO DOI definition matching @doi. Returns zero on
315 * success and negative values on failure.
316 *
317 */
318void netlbl_cfg_cipsov4_del(u32 doi, struct netlbl_audit *audit_info)
319{
320 cipso_v4_doi_remove(doi, audit_info);
321}
322
323/**
324 * netlbl_cfg_cipsov4_map_add - Add a new CIPSOv4 DOI mapping
325 * @doi: the CIPSO DOI
326 * @domain: the domain mapping to add
327 * @addr: IP address
328 * @mask: IP address mask
329 * @audit_info: NetLabel audit information
330 *
331 * Description:
332 * Add a new NetLabel/LSM domain mapping for the given CIPSO DOI to the NetLabel
333 * subsystem. A @domain value of NULL adds a new default domain mapping.
334 * Returns zero on success, negative values on failure.
335 *
336 */
337int netlbl_cfg_cipsov4_map_add(u32 doi,
338 const char *domain,
339 const struct in_addr *addr,
340 const struct in_addr *mask,
341 struct netlbl_audit *audit_info)
342{
343 int ret_val = -ENOMEM;
344 struct cipso_v4_doi *doi_def;
345 struct netlbl_dom_map *entry;
346 struct netlbl_domaddr_map *addrmap = NULL;
347 struct netlbl_domaddr4_map *addrinfo = NULL;
348
349 doi_def = cipso_v4_doi_getdef(doi);
350 if (doi_def == NULL)
351 return -ENOENT;
352
353 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
354 if (entry == NULL)
355 goto out_entry;
356 entry->family = AF_INET;
357 if (domain != NULL) {
358 entry->domain = kstrdup(domain, GFP_ATOMIC);
359 if (entry->domain == NULL)
360 goto out_domain;
361 }
362
363 if (addr == NULL && mask == NULL) {
364 entry->def.cipso = doi_def;
365 entry->def.type = NETLBL_NLTYPE_CIPSOV4;
366 } else if (addr != NULL && mask != NULL) {
367 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
368 if (addrmap == NULL)
369 goto out_addrmap;
370 INIT_LIST_HEAD(&addrmap->list4);
371 INIT_LIST_HEAD(&addrmap->list6);
372
373 addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC);
374 if (addrinfo == NULL)
375 goto out_addrinfo;
376 addrinfo->def.cipso = doi_def;
377 addrinfo->def.type = NETLBL_NLTYPE_CIPSOV4;
378 addrinfo->list.addr = addr->s_addr & mask->s_addr;
379 addrinfo->list.mask = mask->s_addr;
380 addrinfo->list.valid = 1;
381 ret_val = netlbl_af4list_add(&addrinfo->list, &addrmap->list4);
382 if (ret_val != 0)
383 goto cfg_cipsov4_map_add_failure;
384
385 entry->def.addrsel = addrmap;
386 entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
387 } else {
388 ret_val = -EINVAL;
389 goto out_addrmap;
390 }
391
392 ret_val = netlbl_domhsh_add(entry, audit_info);
393 if (ret_val != 0)
394 goto cfg_cipsov4_map_add_failure;
395
396 return 0;
397
398cfg_cipsov4_map_add_failure:
399 kfree(addrinfo);
400out_addrinfo:
401 kfree(addrmap);
402out_addrmap:
403 kfree(entry->domain);
404out_domain:
405 kfree(entry);
406out_entry:
407 cipso_v4_doi_putdef(doi_def);
408 return ret_val;
409}
410
411/**
412 * netlbl_cfg_calipso_add - Add a new CALIPSO DOI definition
413 * @doi_def: CALIPSO DOI definition
414 * @audit_info: NetLabel audit information
415 *
416 * Description:
417 * Add a new CALIPSO DOI definition as defined by @doi_def. Returns zero on
418 * success and negative values on failure.
419 *
420 */
421int netlbl_cfg_calipso_add(struct calipso_doi *doi_def,
422 struct netlbl_audit *audit_info)
423{
424#if IS_ENABLED(CONFIG_IPV6)
425 return calipso_doi_add(doi_def, audit_info);
426#else /* IPv6 */
427 return -ENOSYS;
428#endif /* IPv6 */
429}
430
431/**
432 * netlbl_cfg_calipso_del - Remove an existing CALIPSO DOI definition
433 * @doi: CALIPSO DOI
434 * @audit_info: NetLabel audit information
435 *
436 * Description:
437 * Remove an existing CALIPSO DOI definition matching @doi. Returns zero on
438 * success and negative values on failure.
439 *
440 */
441void netlbl_cfg_calipso_del(u32 doi, struct netlbl_audit *audit_info)
442{
443#if IS_ENABLED(CONFIG_IPV6)
444 calipso_doi_remove(doi, audit_info);
445#endif /* IPv6 */
446}
447
448/**
449 * netlbl_cfg_calipso_map_add - Add a new CALIPSO DOI mapping
450 * @doi: the CALIPSO DOI
451 * @domain: the domain mapping to add
452 * @addr: IP address
453 * @mask: IP address mask
454 * @audit_info: NetLabel audit information
455 *
456 * Description:
457 * Add a new NetLabel/LSM domain mapping for the given CALIPSO DOI to the
458 * NetLabel subsystem. A @domain value of NULL adds a new default domain
459 * mapping. Returns zero on success, negative values on failure.
460 *
461 */
462int netlbl_cfg_calipso_map_add(u32 doi,
463 const char *domain,
464 const struct in6_addr *addr,
465 const struct in6_addr *mask,
466 struct netlbl_audit *audit_info)
467{
468#if IS_ENABLED(CONFIG_IPV6)
469 int ret_val = -ENOMEM;
470 struct calipso_doi *doi_def;
471 struct netlbl_dom_map *entry;
472 struct netlbl_domaddr_map *addrmap = NULL;
473 struct netlbl_domaddr6_map *addrinfo = NULL;
474
475 doi_def = calipso_doi_getdef(doi);
476 if (doi_def == NULL)
477 return -ENOENT;
478
479 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
480 if (entry == NULL)
481 goto out_entry;
482 entry->family = AF_INET6;
483 if (domain != NULL) {
484 entry->domain = kstrdup(domain, GFP_ATOMIC);
485 if (entry->domain == NULL)
486 goto out_domain;
487 }
488
489 if (addr == NULL && mask == NULL) {
490 entry->def.calipso = doi_def;
491 entry->def.type = NETLBL_NLTYPE_CALIPSO;
492 } else if (addr != NULL && mask != NULL) {
493 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
494 if (addrmap == NULL)
495 goto out_addrmap;
496 INIT_LIST_HEAD(&addrmap->list4);
497 INIT_LIST_HEAD(&addrmap->list6);
498
499 addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC);
500 if (addrinfo == NULL)
501 goto out_addrinfo;
502 addrinfo->def.calipso = doi_def;
503 addrinfo->def.type = NETLBL_NLTYPE_CALIPSO;
504 addrinfo->list.addr = *addr;
505 addrinfo->list.addr.s6_addr32[0] &= mask->s6_addr32[0];
506 addrinfo->list.addr.s6_addr32[1] &= mask->s6_addr32[1];
507 addrinfo->list.addr.s6_addr32[2] &= mask->s6_addr32[2];
508 addrinfo->list.addr.s6_addr32[3] &= mask->s6_addr32[3];
509 addrinfo->list.mask = *mask;
510 addrinfo->list.valid = 1;
511 ret_val = netlbl_af6list_add(&addrinfo->list, &addrmap->list6);
512 if (ret_val != 0)
513 goto cfg_calipso_map_add_failure;
514
515 entry->def.addrsel = addrmap;
516 entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
517 } else {
518 ret_val = -EINVAL;
519 goto out_addrmap;
520 }
521
522 ret_val = netlbl_domhsh_add(entry, audit_info);
523 if (ret_val != 0)
524 goto cfg_calipso_map_add_failure;
525
526 return 0;
527
528cfg_calipso_map_add_failure:
529 kfree(addrinfo);
530out_addrinfo:
531 kfree(addrmap);
532out_addrmap:
533 kfree(entry->domain);
534out_domain:
535 kfree(entry);
536out_entry:
537 calipso_doi_putdef(doi_def);
538 return ret_val;
539#else /* IPv6 */
540 return -ENOSYS;
541#endif /* IPv6 */
542}
543
544/*
545 * Security Attribute Functions
546 */
547
548#define _CM_F_NONE 0x00000000
549#define _CM_F_ALLOC 0x00000001
550#define _CM_F_WALK 0x00000002
551
552/**
553 * _netlbl_catmap_getnode - Get a individual node from a catmap
554 * @catmap: pointer to the category bitmap
555 * @offset: the requested offset
556 * @cm_flags: catmap flags, see _CM_F_*
557 * @gfp_flags: memory allocation flags
558 *
559 * Description:
560 * Iterate through the catmap looking for the node associated with @offset.
561 * If the _CM_F_ALLOC flag is set in @cm_flags and there is no associated node,
562 * one will be created and inserted into the catmap. If the _CM_F_WALK flag is
563 * set in @cm_flags and there is no associated node, the next highest node will
564 * be returned. Returns a pointer to the node on success, NULL on failure.
565 *
566 */
567static struct netlbl_lsm_catmap *_netlbl_catmap_getnode(
568 struct netlbl_lsm_catmap **catmap,
569 u32 offset,
570 unsigned int cm_flags,
571 gfp_t gfp_flags)
572{
573 struct netlbl_lsm_catmap *iter = *catmap;
574 struct netlbl_lsm_catmap *prev = NULL;
575
576 if (iter == NULL)
577 goto catmap_getnode_alloc;
578 if (offset < iter->startbit)
579 goto catmap_getnode_walk;
580 while (iter && offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
581 prev = iter;
582 iter = iter->next;
583 }
584 if (iter == NULL || offset < iter->startbit)
585 goto catmap_getnode_walk;
586
587 return iter;
588
589catmap_getnode_walk:
590 if (cm_flags & _CM_F_WALK)
591 return iter;
592catmap_getnode_alloc:
593 if (!(cm_flags & _CM_F_ALLOC))
594 return NULL;
595
596 iter = netlbl_catmap_alloc(gfp_flags);
597 if (iter == NULL)
598 return NULL;
599 iter->startbit = offset & ~(NETLBL_CATMAP_SIZE - 1);
600
601 if (prev == NULL) {
602 iter->next = *catmap;
603 *catmap = iter;
604 } else {
605 iter->next = prev->next;
606 prev->next = iter;
607 }
608
609 return iter;
610}
611
612/**
613 * netlbl_catmap_walk - Walk a LSM secattr catmap looking for a bit
614 * @catmap: the category bitmap
615 * @offset: the offset to start searching at, in bits
616 *
617 * Description:
618 * This function walks a LSM secattr category bitmap starting at @offset and
619 * returns the spot of the first set bit or -ENOENT if no bits are set.
620 *
621 */
622int netlbl_catmap_walk(struct netlbl_lsm_catmap *catmap, u32 offset)
623{
624 struct netlbl_lsm_catmap *iter = catmap;
625 u32 idx;
626 u32 bit;
627 NETLBL_CATMAP_MAPTYPE bitmap;
628
629 iter = _netlbl_catmap_getnode(&catmap, offset, _CM_F_WALK, 0);
630 if (iter == NULL)
631 return -ENOENT;
632 if (offset > iter->startbit) {
633 offset -= iter->startbit;
634 idx = offset / NETLBL_CATMAP_MAPSIZE;
635 bit = offset % NETLBL_CATMAP_MAPSIZE;
636 } else {
637 idx = 0;
638 bit = 0;
639 }
640 bitmap = iter->bitmap[idx] >> bit;
641
642 for (;;) {
643 if (bitmap != 0) {
644 while ((bitmap & NETLBL_CATMAP_BIT) == 0) {
645 bitmap >>= 1;
646 bit++;
647 }
648 return iter->startbit +
649 (NETLBL_CATMAP_MAPSIZE * idx) + bit;
650 }
651 if (++idx >= NETLBL_CATMAP_MAPCNT) {
652 if (iter->next != NULL) {
653 iter = iter->next;
654 idx = 0;
655 } else
656 return -ENOENT;
657 }
658 bitmap = iter->bitmap[idx];
659 bit = 0;
660 }
661
662 return -ENOENT;
663}
664EXPORT_SYMBOL(netlbl_catmap_walk);
665
666/**
667 * netlbl_catmap_walkrng - Find the end of a string of set bits
668 * @catmap: the category bitmap
669 * @offset: the offset to start searching at, in bits
670 *
671 * Description:
672 * This function walks a LSM secattr category bitmap starting at @offset and
673 * returns the spot of the first cleared bit or -ENOENT if the offset is past
674 * the end of the bitmap.
675 *
676 */
677int netlbl_catmap_walkrng(struct netlbl_lsm_catmap *catmap, u32 offset)
678{
679 struct netlbl_lsm_catmap *iter;
680 struct netlbl_lsm_catmap *prev = NULL;
681 u32 idx;
682 u32 bit;
683 NETLBL_CATMAP_MAPTYPE bitmask;
684 NETLBL_CATMAP_MAPTYPE bitmap;
685
686 iter = _netlbl_catmap_getnode(&catmap, offset, _CM_F_WALK, 0);
687 if (iter == NULL)
688 return -ENOENT;
689 if (offset > iter->startbit) {
690 offset -= iter->startbit;
691 idx = offset / NETLBL_CATMAP_MAPSIZE;
692 bit = offset % NETLBL_CATMAP_MAPSIZE;
693 } else {
694 idx = 0;
695 bit = 0;
696 }
697 bitmask = NETLBL_CATMAP_BIT << bit;
698
699 for (;;) {
700 bitmap = iter->bitmap[idx];
701 while (bitmask != 0 && (bitmap & bitmask) != 0) {
702 bitmask <<= 1;
703 bit++;
704 }
705
706 if (prev && idx == 0 && bit == 0)
707 return prev->startbit + NETLBL_CATMAP_SIZE - 1;
708 else if (bitmask != 0)
709 return iter->startbit +
710 (NETLBL_CATMAP_MAPSIZE * idx) + bit - 1;
711 else if (++idx >= NETLBL_CATMAP_MAPCNT) {
712 if (iter->next == NULL)
713 return iter->startbit + NETLBL_CATMAP_SIZE - 1;
714 prev = iter;
715 iter = iter->next;
716 idx = 0;
717 }
718 bitmask = NETLBL_CATMAP_BIT;
719 bit = 0;
720 }
721
722 return -ENOENT;
723}
724
725/**
726 * netlbl_catmap_getlong - Export an unsigned long bitmap
727 * @catmap: pointer to the category bitmap
728 * @offset: pointer to the requested offset
729 * @bitmap: the exported bitmap
730 *
731 * Description:
732 * Export a bitmap with an offset greater than or equal to @offset and return
733 * it in @bitmap. The @offset must be aligned to an unsigned long and will be
734 * updated on return if different from what was requested; if the catmap is
735 * empty at the requested offset and beyond, the @offset is set to (u32)-1.
736 * Returns zero on sucess, negative values on failure.
737 *
738 */
739int netlbl_catmap_getlong(struct netlbl_lsm_catmap *catmap,
740 u32 *offset,
741 unsigned long *bitmap)
742{
743 struct netlbl_lsm_catmap *iter;
744 u32 off = *offset;
745 u32 idx;
746
747 /* only allow aligned offsets */
748 if ((off & (BITS_PER_LONG - 1)) != 0)
749 return -EINVAL;
750
751 if (off < catmap->startbit) {
752 off = catmap->startbit;
753 *offset = off;
754 }
755 iter = _netlbl_catmap_getnode(&catmap, off, _CM_F_WALK, 0);
756 if (iter == NULL) {
757 *offset = (u32)-1;
758 return 0;
759 }
760
761 if (off < iter->startbit) {
762 *offset = iter->startbit;
763 off = 0;
764 } else
765 off -= iter->startbit;
766 idx = off / NETLBL_CATMAP_MAPSIZE;
767 *bitmap = iter->bitmap[idx] >> (off % NETLBL_CATMAP_MAPSIZE);
768
769 return 0;
770}
771
772/**
773 * netlbl_catmap_setbit - Set a bit in a LSM secattr catmap
774 * @catmap: pointer to the category bitmap
775 * @bit: the bit to set
776 * @flags: memory allocation flags
777 *
778 * Description:
779 * Set the bit specified by @bit in @catmap. Returns zero on success,
780 * negative values on failure.
781 *
782 */
783int netlbl_catmap_setbit(struct netlbl_lsm_catmap **catmap,
784 u32 bit,
785 gfp_t flags)
786{
787 struct netlbl_lsm_catmap *iter;
788 u32 idx;
789
790 iter = _netlbl_catmap_getnode(catmap, bit, _CM_F_ALLOC, flags);
791 if (iter == NULL)
792 return -ENOMEM;
793
794 bit -= iter->startbit;
795 idx = bit / NETLBL_CATMAP_MAPSIZE;
796 iter->bitmap[idx] |= NETLBL_CATMAP_BIT << (bit % NETLBL_CATMAP_MAPSIZE);
797
798 return 0;
799}
800EXPORT_SYMBOL(netlbl_catmap_setbit);
801
802/**
803 * netlbl_catmap_setrng - Set a range of bits in a LSM secattr catmap
804 * @catmap: pointer to the category bitmap
805 * @start: the starting bit
806 * @end: the last bit in the string
807 * @flags: memory allocation flags
808 *
809 * Description:
810 * Set a range of bits, starting at @start and ending with @end. Returns zero
811 * on success, negative values on failure.
812 *
813 */
814int netlbl_catmap_setrng(struct netlbl_lsm_catmap **catmap,
815 u32 start,
816 u32 end,
817 gfp_t flags)
818{
819 int rc = 0;
820 u32 spot = start;
821
822 while (rc == 0 && spot <= end) {
823 if (((spot & (BITS_PER_LONG - 1)) == 0) &&
824 ((end - spot) > BITS_PER_LONG)) {
825 rc = netlbl_catmap_setlong(catmap,
826 spot,
827 (unsigned long)-1,
828 flags);
829 spot += BITS_PER_LONG;
830 } else
831 rc = netlbl_catmap_setbit(catmap, spot++, flags);
832 }
833
834 return rc;
835}
836
837/**
838 * netlbl_catmap_setlong - Import an unsigned long bitmap
839 * @catmap: pointer to the category bitmap
840 * @offset: offset to the start of the imported bitmap
841 * @bitmap: the bitmap to import
842 * @flags: memory allocation flags
843 *
844 * Description:
845 * Import the bitmap specified in @bitmap into @catmap, using the offset
846 * in @offset. The offset must be aligned to an unsigned long. Returns zero
847 * on success, negative values on failure.
848 *
849 */
850int netlbl_catmap_setlong(struct netlbl_lsm_catmap **catmap,
851 u32 offset,
852 unsigned long bitmap,
853 gfp_t flags)
854{
855 struct netlbl_lsm_catmap *iter;
856 u32 idx;
857
858 /* only allow aligned offsets */
859 if ((offset & (BITS_PER_LONG - 1)) != 0)
860 return -EINVAL;
861
862 iter = _netlbl_catmap_getnode(catmap, offset, _CM_F_ALLOC, flags);
863 if (iter == NULL)
864 return -ENOMEM;
865
866 offset -= iter->startbit;
867 idx = offset / NETLBL_CATMAP_MAPSIZE;
868 iter->bitmap[idx] |= bitmap << (offset % NETLBL_CATMAP_MAPSIZE);
869
870 return 0;
871}
872
873/* Bitmap functions
874 */
875
876/**
877 * netlbl_bitmap_walk - Walk a bitmap looking for a bit
878 * @bitmap: the bitmap
879 * @bitmap_len: length in bits
880 * @offset: starting offset
881 * @state: if non-zero, look for a set (1) bit else look for a cleared (0) bit
882 *
883 * Description:
884 * Starting at @offset, walk the bitmap from left to right until either the
885 * desired bit is found or we reach the end. Return the bit offset, -1 if
886 * not found, or -2 if error.
887 */
888int netlbl_bitmap_walk(const unsigned char *bitmap, u32 bitmap_len,
889 u32 offset, u8 state)
890{
891 u32 bit_spot;
892 u32 byte_offset;
893 unsigned char bitmask;
894 unsigned char byte;
895
896 byte_offset = offset / 8;
897 byte = bitmap[byte_offset];
898 bit_spot = offset;
899 bitmask = 0x80 >> (offset % 8);
900
901 while (bit_spot < bitmap_len) {
902 if ((state && (byte & bitmask) == bitmask) ||
903 (state == 0 && (byte & bitmask) == 0))
904 return bit_spot;
905
906 bit_spot++;
907 bitmask >>= 1;
908 if (bitmask == 0) {
909 byte = bitmap[++byte_offset];
910 bitmask = 0x80;
911 }
912 }
913
914 return -1;
915}
916EXPORT_SYMBOL(netlbl_bitmap_walk);
917
918/**
919 * netlbl_bitmap_setbit - Sets a single bit in a bitmap
920 * @bitmap: the bitmap
921 * @bit: the bit
922 * @state: if non-zero, set the bit (1) else clear the bit (0)
923 *
924 * Description:
925 * Set a single bit in the bitmask. Returns zero on success, negative values
926 * on error.
927 */
928void netlbl_bitmap_setbit(unsigned char *bitmap, u32 bit, u8 state)
929{
930 u32 byte_spot;
931 u8 bitmask;
932
933 /* gcc always rounds to zero when doing integer division */
934 byte_spot = bit / 8;
935 bitmask = 0x80 >> (bit % 8);
936 if (state)
937 bitmap[byte_spot] |= bitmask;
938 else
939 bitmap[byte_spot] &= ~bitmask;
940}
941EXPORT_SYMBOL(netlbl_bitmap_setbit);
942
943/*
944 * LSM Functions
945 */
946
947/**
948 * netlbl_enabled - Determine if the NetLabel subsystem is enabled
949 *
950 * Description:
951 * The LSM can use this function to determine if it should use NetLabel
952 * security attributes in it's enforcement mechanism. Currently, NetLabel is
953 * considered to be enabled when it's configuration contains a valid setup for
954 * at least one labeled protocol (i.e. NetLabel can understand incoming
955 * labeled packets of at least one type); otherwise NetLabel is considered to
956 * be disabled.
957 *
958 */
959int netlbl_enabled(void)
960{
961 /* At some point we probably want to expose this mechanism to the user
962 * as well so that admins can toggle NetLabel regardless of the
963 * configuration */
964 return (atomic_read(&netlabel_mgmt_protocount) > 0);
965}
966
967/**
968 * netlbl_sock_setattr - Label a socket using the correct protocol
969 * @sk: the socket to label
970 * @family: protocol family
971 * @secattr: the security attributes
972 *
973 * Description:
974 * Attach the correct label to the given socket using the security attributes
975 * specified in @secattr. This function requires exclusive access to @sk,
976 * which means it either needs to be in the process of being created or locked.
977 * Returns zero on success, -EDESTADDRREQ if the domain is configured to use
978 * network address selectors (can't blindly label the socket), and negative
979 * values on all other failures.
980 *
981 */
982int netlbl_sock_setattr(struct sock *sk,
983 u16 family,
984 const struct netlbl_lsm_secattr *secattr)
985{
986 int ret_val;
987 struct netlbl_dom_map *dom_entry;
988
989 rcu_read_lock();
990 dom_entry = netlbl_domhsh_getentry(secattr->domain, family);
991 if (dom_entry == NULL) {
992 ret_val = -ENOENT;
993 goto socket_setattr_return;
994 }
995 switch (family) {
996 case AF_INET:
997 switch (dom_entry->def.type) {
998 case NETLBL_NLTYPE_ADDRSELECT:
999 ret_val = -EDESTADDRREQ;
1000 break;
1001 case NETLBL_NLTYPE_CIPSOV4:
1002 ret_val = cipso_v4_sock_setattr(sk,
1003 dom_entry->def.cipso,
1004 secattr);
1005 break;
1006 case NETLBL_NLTYPE_UNLABELED:
1007 ret_val = 0;
1008 break;
1009 default:
1010 ret_val = -ENOENT;
1011 }
1012 break;
1013#if IS_ENABLED(CONFIG_IPV6)
1014 case AF_INET6:
1015 switch (dom_entry->def.type) {
1016 case NETLBL_NLTYPE_ADDRSELECT:
1017 ret_val = -EDESTADDRREQ;
1018 break;
1019 case NETLBL_NLTYPE_CALIPSO:
1020 ret_val = calipso_sock_setattr(sk,
1021 dom_entry->def.calipso,
1022 secattr);
1023 break;
1024 case NETLBL_NLTYPE_UNLABELED:
1025 ret_val = 0;
1026 break;
1027 default:
1028 ret_val = -ENOENT;
1029 }
1030 break;
1031#endif /* IPv6 */
1032 default:
1033 ret_val = -EPROTONOSUPPORT;
1034 }
1035
1036socket_setattr_return:
1037 rcu_read_unlock();
1038 return ret_val;
1039}
1040
1041/**
1042 * netlbl_sock_delattr - Delete all the NetLabel labels on a socket
1043 * @sk: the socket
1044 *
1045 * Description:
1046 * Remove all the NetLabel labeling from @sk. The caller is responsible for
1047 * ensuring that @sk is locked.
1048 *
1049 */
1050void netlbl_sock_delattr(struct sock *sk)
1051{
1052 switch (sk->sk_family) {
1053 case AF_INET:
1054 cipso_v4_sock_delattr(sk);
1055 break;
1056#if IS_ENABLED(CONFIG_IPV6)
1057 case AF_INET6:
1058 calipso_sock_delattr(sk);
1059 break;
1060#endif /* IPv6 */
1061 }
1062}
1063
1064/**
1065 * netlbl_sock_getattr - Determine the security attributes of a sock
1066 * @sk: the sock
1067 * @secattr: the security attributes
1068 *
1069 * Description:
1070 * Examines the given sock to see if any NetLabel style labeling has been
1071 * applied to the sock, if so it parses the socket label and returns the
1072 * security attributes in @secattr. Returns zero on success, negative values
1073 * on failure.
1074 *
1075 */
1076int netlbl_sock_getattr(struct sock *sk,
1077 struct netlbl_lsm_secattr *secattr)
1078{
1079 int ret_val;
1080
1081 switch (sk->sk_family) {
1082 case AF_INET:
1083 ret_val = cipso_v4_sock_getattr(sk, secattr);
1084 break;
1085#if IS_ENABLED(CONFIG_IPV6)
1086 case AF_INET6:
1087 ret_val = calipso_sock_getattr(sk, secattr);
1088 break;
1089#endif /* IPv6 */
1090 default:
1091 ret_val = -EPROTONOSUPPORT;
1092 }
1093
1094 return ret_val;
1095}
1096
1097/**
1098 * netlbl_conn_setattr - Label a connected socket using the correct protocol
1099 * @sk: the socket to label
1100 * @addr: the destination address
1101 * @secattr: the security attributes
1102 *
1103 * Description:
1104 * Attach the correct label to the given connected socket using the security
1105 * attributes specified in @secattr. The caller is responsible for ensuring
1106 * that @sk is locked. Returns zero on success, negative values on failure.
1107 *
1108 */
1109int netlbl_conn_setattr(struct sock *sk,
1110 struct sockaddr *addr,
1111 const struct netlbl_lsm_secattr *secattr)
1112{
1113 int ret_val;
1114 struct sockaddr_in *addr4;
1115#if IS_ENABLED(CONFIG_IPV6)
1116 struct sockaddr_in6 *addr6;
1117#endif
1118 struct netlbl_dommap_def *entry;
1119
1120 rcu_read_lock();
1121 switch (addr->sa_family) {
1122 case AF_INET:
1123 addr4 = (struct sockaddr_in *)addr;
1124 entry = netlbl_domhsh_getentry_af4(secattr->domain,
1125 addr4->sin_addr.s_addr);
1126 if (entry == NULL) {
1127 ret_val = -ENOENT;
1128 goto conn_setattr_return;
1129 }
1130 switch (entry->type) {
1131 case NETLBL_NLTYPE_CIPSOV4:
1132 ret_val = cipso_v4_sock_setattr(sk,
1133 entry->cipso, secattr);
1134 break;
1135 case NETLBL_NLTYPE_UNLABELED:
1136 /* just delete the protocols we support for right now
1137 * but we could remove other protocols if needed */
1138 netlbl_sock_delattr(sk);
1139 ret_val = 0;
1140 break;
1141 default:
1142 ret_val = -ENOENT;
1143 }
1144 break;
1145#if IS_ENABLED(CONFIG_IPV6)
1146 case AF_INET6:
1147 addr6 = (struct sockaddr_in6 *)addr;
1148 entry = netlbl_domhsh_getentry_af6(secattr->domain,
1149 &addr6->sin6_addr);
1150 if (entry == NULL) {
1151 ret_val = -ENOENT;
1152 goto conn_setattr_return;
1153 }
1154 switch (entry->type) {
1155 case NETLBL_NLTYPE_CALIPSO:
1156 ret_val = calipso_sock_setattr(sk,
1157 entry->calipso, secattr);
1158 break;
1159 case NETLBL_NLTYPE_UNLABELED:
1160 /* just delete the protocols we support for right now
1161 * but we could remove other protocols if needed */
1162 netlbl_sock_delattr(sk);
1163 ret_val = 0;
1164 break;
1165 default:
1166 ret_val = -ENOENT;
1167 }
1168 break;
1169#endif /* IPv6 */
1170 default:
1171 ret_val = -EPROTONOSUPPORT;
1172 }
1173
1174conn_setattr_return:
1175 rcu_read_unlock();
1176 return ret_val;
1177}
1178
1179/**
1180 * netlbl_req_setattr - Label a request socket using the correct protocol
1181 * @req: the request socket to label
1182 * @secattr: the security attributes
1183 *
1184 * Description:
1185 * Attach the correct label to the given socket using the security attributes
1186 * specified in @secattr. Returns zero on success, negative values on failure.
1187 *
1188 */
1189int netlbl_req_setattr(struct request_sock *req,
1190 const struct netlbl_lsm_secattr *secattr)
1191{
1192 int ret_val;
1193 struct netlbl_dommap_def *entry;
1194 struct inet_request_sock *ireq = inet_rsk(req);
1195
1196 rcu_read_lock();
1197 switch (req->rsk_ops->family) {
1198 case AF_INET:
1199 entry = netlbl_domhsh_getentry_af4(secattr->domain,
1200 ireq->ir_rmt_addr);
1201 if (entry == NULL) {
1202 ret_val = -ENOENT;
1203 goto req_setattr_return;
1204 }
1205 switch (entry->type) {
1206 case NETLBL_NLTYPE_CIPSOV4:
1207 ret_val = cipso_v4_req_setattr(req,
1208 entry->cipso, secattr);
1209 break;
1210 case NETLBL_NLTYPE_UNLABELED:
1211 netlbl_req_delattr(req);
1212 ret_val = 0;
1213 break;
1214 default:
1215 ret_val = -ENOENT;
1216 }
1217 break;
1218#if IS_ENABLED(CONFIG_IPV6)
1219 case AF_INET6:
1220 entry = netlbl_domhsh_getentry_af6(secattr->domain,
1221 &ireq->ir_v6_rmt_addr);
1222 if (entry == NULL) {
1223 ret_val = -ENOENT;
1224 goto req_setattr_return;
1225 }
1226 switch (entry->type) {
1227 case NETLBL_NLTYPE_CALIPSO:
1228 ret_val = calipso_req_setattr(req,
1229 entry->calipso, secattr);
1230 break;
1231 case NETLBL_NLTYPE_UNLABELED:
1232 netlbl_req_delattr(req);
1233 ret_val = 0;
1234 break;
1235 default:
1236 ret_val = -ENOENT;
1237 }
1238 break;
1239#endif /* IPv6 */
1240 default:
1241 ret_val = -EPROTONOSUPPORT;
1242 }
1243
1244req_setattr_return:
1245 rcu_read_unlock();
1246 return ret_val;
1247}
1248
1249/**
1250* netlbl_req_delattr - Delete all the NetLabel labels on a socket
1251* @req: the socket
1252*
1253* Description:
1254* Remove all the NetLabel labeling from @req.
1255*
1256*/
1257void netlbl_req_delattr(struct request_sock *req)
1258{
1259 switch (req->rsk_ops->family) {
1260 case AF_INET:
1261 cipso_v4_req_delattr(req);
1262 break;
1263#if IS_ENABLED(CONFIG_IPV6)
1264 case AF_INET6:
1265 calipso_req_delattr(req);
1266 break;
1267#endif /* IPv6 */
1268 }
1269}
1270
1271/**
1272 * netlbl_skbuff_setattr - Label a packet using the correct protocol
1273 * @skb: the packet
1274 * @family: protocol family
1275 * @secattr: the security attributes
1276 *
1277 * Description:
1278 * Attach the correct label to the given packet using the security attributes
1279 * specified in @secattr. Returns zero on success, negative values on failure.
1280 *
1281 */
1282int netlbl_skbuff_setattr(struct sk_buff *skb,
1283 u16 family,
1284 const struct netlbl_lsm_secattr *secattr)
1285{
1286 int ret_val;
1287 struct iphdr *hdr4;
1288#if IS_ENABLED(CONFIG_IPV6)
1289 struct ipv6hdr *hdr6;
1290#endif
1291 struct netlbl_dommap_def *entry;
1292
1293 rcu_read_lock();
1294 switch (family) {
1295 case AF_INET:
1296 hdr4 = ip_hdr(skb);
1297 entry = netlbl_domhsh_getentry_af4(secattr->domain,
1298 hdr4->daddr);
1299 if (entry == NULL) {
1300 ret_val = -ENOENT;
1301 goto skbuff_setattr_return;
1302 }
1303 switch (entry->type) {
1304 case NETLBL_NLTYPE_CIPSOV4:
1305 ret_val = cipso_v4_skbuff_setattr(skb, entry->cipso,
1306 secattr);
1307 break;
1308 case NETLBL_NLTYPE_UNLABELED:
1309 /* just delete the protocols we support for right now
1310 * but we could remove other protocols if needed */
1311 ret_val = cipso_v4_skbuff_delattr(skb);
1312 break;
1313 default:
1314 ret_val = -ENOENT;
1315 }
1316 break;
1317#if IS_ENABLED(CONFIG_IPV6)
1318 case AF_INET6:
1319 hdr6 = ipv6_hdr(skb);
1320 entry = netlbl_domhsh_getentry_af6(secattr->domain,
1321 &hdr6->daddr);
1322 if (entry == NULL) {
1323 ret_val = -ENOENT;
1324 goto skbuff_setattr_return;
1325 }
1326 switch (entry->type) {
1327 case NETLBL_NLTYPE_CALIPSO:
1328 ret_val = calipso_skbuff_setattr(skb, entry->calipso,
1329 secattr);
1330 break;
1331 case NETLBL_NLTYPE_UNLABELED:
1332 /* just delete the protocols we support for right now
1333 * but we could remove other protocols if needed */
1334 ret_val = calipso_skbuff_delattr(skb);
1335 break;
1336 default:
1337 ret_val = -ENOENT;
1338 }
1339 break;
1340#endif /* IPv6 */
1341 default:
1342 ret_val = -EPROTONOSUPPORT;
1343 }
1344
1345skbuff_setattr_return:
1346 rcu_read_unlock();
1347 return ret_val;
1348}
1349
1350/**
1351 * netlbl_skbuff_getattr - Determine the security attributes of a packet
1352 * @skb: the packet
1353 * @family: protocol family
1354 * @secattr: the security attributes
1355 *
1356 * Description:
1357 * Examines the given packet to see if a recognized form of packet labeling
1358 * is present, if so it parses the packet label and returns the security
1359 * attributes in @secattr. Returns zero on success, negative values on
1360 * failure.
1361 *
1362 */
1363int netlbl_skbuff_getattr(const struct sk_buff *skb,
1364 u16 family,
1365 struct netlbl_lsm_secattr *secattr)
1366{
1367 unsigned char *ptr;
1368
1369 switch (family) {
1370 case AF_INET:
1371 ptr = cipso_v4_optptr(skb);
1372 if (ptr && cipso_v4_getattr(ptr, secattr) == 0)
1373 return 0;
1374 break;
1375#if IS_ENABLED(CONFIG_IPV6)
1376 case AF_INET6:
1377 ptr = calipso_optptr(skb);
1378 if (ptr && calipso_getattr(ptr, secattr) == 0)
1379 return 0;
1380 break;
1381#endif /* IPv6 */
1382 }
1383
1384 return netlbl_unlabel_getattr(skb, family, secattr);
1385}
1386
1387/**
1388 * netlbl_skbuff_err - Handle a LSM error on a sk_buff
1389 * @skb: the packet
1390 * @family: the family
1391 * @error: the error code
1392 * @gateway: true if host is acting as a gateway, false otherwise
1393 *
1394 * Description:
1395 * Deal with a LSM problem when handling the packet in @skb, typically this is
1396 * a permission denied problem (-EACCES). The correct action is determined
1397 * according to the packet's labeling protocol.
1398 *
1399 */
1400void netlbl_skbuff_err(struct sk_buff *skb, u16 family, int error, int gateway)
1401{
1402 switch (family) {
1403 case AF_INET:
1404 if (cipso_v4_optptr(skb))
1405 cipso_v4_error(skb, error, gateway);
1406 break;
1407 }
1408}
1409
1410/**
1411 * netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches
1412 *
1413 * Description:
1414 * For all of the NetLabel protocols that support some form of label mapping
1415 * cache, invalidate the cache. Returns zero on success, negative values on
1416 * error.
1417 *
1418 */
1419void netlbl_cache_invalidate(void)
1420{
1421 cipso_v4_cache_invalidate();
1422#if IS_ENABLED(CONFIG_IPV6)
1423 calipso_cache_invalidate();
1424#endif /* IPv6 */
1425}
1426
1427/**
1428 * netlbl_cache_add - Add an entry to a NetLabel protocol cache
1429 * @skb: the packet
1430 * @family: the family
1431 * @secattr: the packet's security attributes
1432 *
1433 * Description:
1434 * Add the LSM security attributes for the given packet to the underlying
1435 * NetLabel protocol's label mapping cache. Returns zero on success, negative
1436 * values on error.
1437 *
1438 */
1439int netlbl_cache_add(const struct sk_buff *skb, u16 family,
1440 const struct netlbl_lsm_secattr *secattr)
1441{
1442 unsigned char *ptr;
1443
1444 if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0)
1445 return -ENOMSG;
1446
1447 switch (family) {
1448 case AF_INET:
1449 ptr = cipso_v4_optptr(skb);
1450 if (ptr)
1451 return cipso_v4_cache_add(ptr, secattr);
1452 break;
1453#if IS_ENABLED(CONFIG_IPV6)
1454 case AF_INET6:
1455 ptr = calipso_optptr(skb);
1456 if (ptr)
1457 return calipso_cache_add(ptr, secattr);
1458 break;
1459#endif /* IPv6 */
1460 }
1461 return -ENOMSG;
1462}
1463
1464/*
1465 * Protocol Engine Functions
1466 */
1467
1468/**
1469 * netlbl_audit_start - Start an audit message
1470 * @type: audit message type
1471 * @audit_info: NetLabel audit information
1472 *
1473 * Description:
1474 * Start an audit message using the type specified in @type and fill the audit
1475 * message with some fields common to all NetLabel audit messages. This
1476 * function should only be used by protocol engines, not LSMs. Returns a
1477 * pointer to the audit buffer on success, NULL on failure.
1478 *
1479 */
1480struct audit_buffer *netlbl_audit_start(int type,
1481 struct netlbl_audit *audit_info)
1482{
1483 return netlbl_audit_start_common(type, audit_info);
1484}
1485EXPORT_SYMBOL(netlbl_audit_start);
1486
1487/*
1488 * Setup Functions
1489 */
1490
1491/**
1492 * netlbl_init - Initialize NetLabel
1493 *
1494 * Description:
1495 * Perform the required NetLabel initialization before first use.
1496 *
1497 */
1498static int __init netlbl_init(void)
1499{
1500 int ret_val;
1501
1502 printk(KERN_INFO "NetLabel: Initializing\n");
1503 printk(KERN_INFO "NetLabel: domain hash size = %u\n",
1504 (1 << NETLBL_DOMHSH_BITSIZE));
1505 printk(KERN_INFO "NetLabel: protocols = UNLABELED CIPSOv4 CALIPSO\n");
1506
1507 ret_val = netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE);
1508 if (ret_val != 0)
1509 goto init_failure;
1510
1511 ret_val = netlbl_unlabel_init(NETLBL_UNLHSH_BITSIZE);
1512 if (ret_val != 0)
1513 goto init_failure;
1514
1515 ret_val = netlbl_netlink_init();
1516 if (ret_val != 0)
1517 goto init_failure;
1518
1519 ret_val = netlbl_unlabel_defconf();
1520 if (ret_val != 0)
1521 goto init_failure;
1522 printk(KERN_INFO "NetLabel: unlabeled traffic allowed by default\n");
1523
1524 return 0;
1525
1526init_failure:
1527 panic("NetLabel: failed to initialize properly (%d)\n", ret_val);
1528}
1529
1530subsys_initcall(netlbl_init);
1/*
2 * NetLabel Kernel API
3 *
4 * This file defines the kernel API for the NetLabel system. The NetLabel
5 * system manages static and dynamic label mappings for network protocols such
6 * as CIPSO and RIPSO.
7 *
8 * Author: Paul Moore <paul@paul-moore.com>
9 *
10 */
11
12/*
13 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008
14 *
15 * This program is free software; you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License as published by
17 * the Free Software Foundation; either version 2 of the License, or
18 * (at your option) any later version.
19 *
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
23 * the GNU General Public License for more details.
24 *
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, see <http://www.gnu.org/licenses/>.
27 *
28 */
29
30#include <linux/init.h>
31#include <linux/types.h>
32#include <linux/slab.h>
33#include <linux/audit.h>
34#include <linux/in.h>
35#include <linux/in6.h>
36#include <net/ip.h>
37#include <net/ipv6.h>
38#include <net/netlabel.h>
39#include <net/cipso_ipv4.h>
40#include <asm/bug.h>
41#include <linux/atomic.h>
42
43#include "netlabel_domainhash.h"
44#include "netlabel_unlabeled.h"
45#include "netlabel_cipso_v4.h"
46#include "netlabel_user.h"
47#include "netlabel_mgmt.h"
48#include "netlabel_addrlist.h"
49
50/*
51 * Configuration Functions
52 */
53
54/**
55 * netlbl_cfg_map_del - Remove a NetLabel/LSM domain mapping
56 * @domain: the domain mapping to remove
57 * @family: address family
58 * @addr: IP address
59 * @mask: IP address mask
60 * @audit_info: NetLabel audit information
61 *
62 * Description:
63 * Removes a NetLabel/LSM domain mapping. A @domain value of NULL causes the
64 * default domain mapping to be removed. Returns zero on success, negative
65 * values on failure.
66 *
67 */
68int netlbl_cfg_map_del(const char *domain,
69 u16 family,
70 const void *addr,
71 const void *mask,
72 struct netlbl_audit *audit_info)
73{
74 if (addr == NULL && mask == NULL) {
75 return netlbl_domhsh_remove(domain, audit_info);
76 } else if (addr != NULL && mask != NULL) {
77 switch (family) {
78 case AF_INET:
79 return netlbl_domhsh_remove_af4(domain, addr, mask,
80 audit_info);
81 default:
82 return -EPFNOSUPPORT;
83 }
84 } else
85 return -EINVAL;
86}
87
88/**
89 * netlbl_cfg_unlbl_map_add - Add a new unlabeled mapping
90 * @domain: the domain mapping to add
91 * @family: address family
92 * @addr: IP address
93 * @mask: IP address mask
94 * @audit_info: NetLabel audit information
95 *
96 * Description:
97 * Adds a new unlabeled NetLabel/LSM domain mapping. A @domain value of NULL
98 * causes a new default domain mapping to be added. Returns zero on success,
99 * negative values on failure.
100 *
101 */
102int netlbl_cfg_unlbl_map_add(const char *domain,
103 u16 family,
104 const void *addr,
105 const void *mask,
106 struct netlbl_audit *audit_info)
107{
108 int ret_val = -ENOMEM;
109 struct netlbl_dom_map *entry;
110 struct netlbl_domaddr_map *addrmap = NULL;
111 struct netlbl_domaddr4_map *map4 = NULL;
112 struct netlbl_domaddr6_map *map6 = NULL;
113
114 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
115 if (entry == NULL)
116 return -ENOMEM;
117 if (domain != NULL) {
118 entry->domain = kstrdup(domain, GFP_ATOMIC);
119 if (entry->domain == NULL)
120 goto cfg_unlbl_map_add_failure;
121 }
122
123 if (addr == NULL && mask == NULL)
124 entry->def.type = NETLBL_NLTYPE_UNLABELED;
125 else if (addr != NULL && mask != NULL) {
126 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
127 if (addrmap == NULL)
128 goto cfg_unlbl_map_add_failure;
129 INIT_LIST_HEAD(&addrmap->list4);
130 INIT_LIST_HEAD(&addrmap->list6);
131
132 switch (family) {
133 case AF_INET: {
134 const struct in_addr *addr4 = addr;
135 const struct in_addr *mask4 = mask;
136 map4 = kzalloc(sizeof(*map4), GFP_ATOMIC);
137 if (map4 == NULL)
138 goto cfg_unlbl_map_add_failure;
139 map4->def.type = NETLBL_NLTYPE_UNLABELED;
140 map4->list.addr = addr4->s_addr & mask4->s_addr;
141 map4->list.mask = mask4->s_addr;
142 map4->list.valid = 1;
143 ret_val = netlbl_af4list_add(&map4->list,
144 &addrmap->list4);
145 if (ret_val != 0)
146 goto cfg_unlbl_map_add_failure;
147 break;
148 }
149#if IS_ENABLED(CONFIG_IPV6)
150 case AF_INET6: {
151 const struct in6_addr *addr6 = addr;
152 const struct in6_addr *mask6 = mask;
153 map6 = kzalloc(sizeof(*map6), GFP_ATOMIC);
154 if (map6 == NULL)
155 goto cfg_unlbl_map_add_failure;
156 map6->def.type = NETLBL_NLTYPE_UNLABELED;
157 map6->list.addr = *addr6;
158 map6->list.addr.s6_addr32[0] &= mask6->s6_addr32[0];
159 map6->list.addr.s6_addr32[1] &= mask6->s6_addr32[1];
160 map6->list.addr.s6_addr32[2] &= mask6->s6_addr32[2];
161 map6->list.addr.s6_addr32[3] &= mask6->s6_addr32[3];
162 map6->list.mask = *mask6;
163 map6->list.valid = 1;
164 ret_val = netlbl_af6list_add(&map6->list,
165 &addrmap->list6);
166 if (ret_val != 0)
167 goto cfg_unlbl_map_add_failure;
168 break;
169 }
170#endif /* IPv6 */
171 default:
172 goto cfg_unlbl_map_add_failure;
173 }
174
175 entry->def.addrsel = addrmap;
176 entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
177 } else {
178 ret_val = -EINVAL;
179 goto cfg_unlbl_map_add_failure;
180 }
181
182 ret_val = netlbl_domhsh_add(entry, audit_info);
183 if (ret_val != 0)
184 goto cfg_unlbl_map_add_failure;
185
186 return 0;
187
188cfg_unlbl_map_add_failure:
189 kfree(entry->domain);
190 kfree(entry);
191 kfree(addrmap);
192 kfree(map4);
193 kfree(map6);
194 return ret_val;
195}
196
197
198/**
199 * netlbl_cfg_unlbl_static_add - Adds a new static label
200 * @net: network namespace
201 * @dev_name: interface name
202 * @addr: IP address in network byte order (struct in[6]_addr)
203 * @mask: address mask in network byte order (struct in[6]_addr)
204 * @family: address family
205 * @secid: LSM secid value for the entry
206 * @audit_info: NetLabel audit information
207 *
208 * Description:
209 * Adds a new NetLabel static label to be used when protocol provided labels
210 * are not present on incoming traffic. If @dev_name is NULL then the default
211 * interface will be used. Returns zero on success, negative values on failure.
212 *
213 */
214int netlbl_cfg_unlbl_static_add(struct net *net,
215 const char *dev_name,
216 const void *addr,
217 const void *mask,
218 u16 family,
219 u32 secid,
220 struct netlbl_audit *audit_info)
221{
222 u32 addr_len;
223
224 switch (family) {
225 case AF_INET:
226 addr_len = sizeof(struct in_addr);
227 break;
228#if IS_ENABLED(CONFIG_IPV6)
229 case AF_INET6:
230 addr_len = sizeof(struct in6_addr);
231 break;
232#endif /* IPv6 */
233 default:
234 return -EPFNOSUPPORT;
235 }
236
237 return netlbl_unlhsh_add(net,
238 dev_name, addr, mask, addr_len,
239 secid, audit_info);
240}
241
242/**
243 * netlbl_cfg_unlbl_static_del - Removes an existing static label
244 * @net: network namespace
245 * @dev_name: interface name
246 * @addr: IP address in network byte order (struct in[6]_addr)
247 * @mask: address mask in network byte order (struct in[6]_addr)
248 * @family: address family
249 * @audit_info: NetLabel audit information
250 *
251 * Description:
252 * Removes an existing NetLabel static label used when protocol provided labels
253 * are not present on incoming traffic. If @dev_name is NULL then the default
254 * interface will be used. Returns zero on success, negative values on failure.
255 *
256 */
257int netlbl_cfg_unlbl_static_del(struct net *net,
258 const char *dev_name,
259 const void *addr,
260 const void *mask,
261 u16 family,
262 struct netlbl_audit *audit_info)
263{
264 u32 addr_len;
265
266 switch (family) {
267 case AF_INET:
268 addr_len = sizeof(struct in_addr);
269 break;
270#if IS_ENABLED(CONFIG_IPV6)
271 case AF_INET6:
272 addr_len = sizeof(struct in6_addr);
273 break;
274#endif /* IPv6 */
275 default:
276 return -EPFNOSUPPORT;
277 }
278
279 return netlbl_unlhsh_remove(net,
280 dev_name, addr, mask, addr_len,
281 audit_info);
282}
283
284/**
285 * netlbl_cfg_cipsov4_add - Add a new CIPSOv4 DOI definition
286 * @doi_def: CIPSO DOI definition
287 * @audit_info: NetLabel audit information
288 *
289 * Description:
290 * Add a new CIPSO DOI definition as defined by @doi_def. Returns zero on
291 * success and negative values on failure.
292 *
293 */
294int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def,
295 struct netlbl_audit *audit_info)
296{
297 return cipso_v4_doi_add(doi_def, audit_info);
298}
299
300/**
301 * netlbl_cfg_cipsov4_del - Remove an existing CIPSOv4 DOI definition
302 * @doi: CIPSO DOI
303 * @audit_info: NetLabel audit information
304 *
305 * Description:
306 * Remove an existing CIPSO DOI definition matching @doi. Returns zero on
307 * success and negative values on failure.
308 *
309 */
310void netlbl_cfg_cipsov4_del(u32 doi, struct netlbl_audit *audit_info)
311{
312 cipso_v4_doi_remove(doi, audit_info);
313}
314
315/**
316 * netlbl_cfg_cipsov4_map_add - Add a new CIPSOv4 DOI mapping
317 * @doi: the CIPSO DOI
318 * @domain: the domain mapping to add
319 * @addr: IP address
320 * @mask: IP address mask
321 * @audit_info: NetLabel audit information
322 *
323 * Description:
324 * Add a new NetLabel/LSM domain mapping for the given CIPSO DOI to the NetLabel
325 * subsystem. A @domain value of NULL adds a new default domain mapping.
326 * Returns zero on success, negative values on failure.
327 *
328 */
329int netlbl_cfg_cipsov4_map_add(u32 doi,
330 const char *domain,
331 const struct in_addr *addr,
332 const struct in_addr *mask,
333 struct netlbl_audit *audit_info)
334{
335 int ret_val = -ENOMEM;
336 struct cipso_v4_doi *doi_def;
337 struct netlbl_dom_map *entry;
338 struct netlbl_domaddr_map *addrmap = NULL;
339 struct netlbl_domaddr4_map *addrinfo = NULL;
340
341 doi_def = cipso_v4_doi_getdef(doi);
342 if (doi_def == NULL)
343 return -ENOENT;
344
345 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
346 if (entry == NULL)
347 goto out_entry;
348 if (domain != NULL) {
349 entry->domain = kstrdup(domain, GFP_ATOMIC);
350 if (entry->domain == NULL)
351 goto out_domain;
352 }
353
354 if (addr == NULL && mask == NULL) {
355 entry->def.cipso = doi_def;
356 entry->def.type = NETLBL_NLTYPE_CIPSOV4;
357 } else if (addr != NULL && mask != NULL) {
358 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
359 if (addrmap == NULL)
360 goto out_addrmap;
361 INIT_LIST_HEAD(&addrmap->list4);
362 INIT_LIST_HEAD(&addrmap->list6);
363
364 addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC);
365 if (addrinfo == NULL)
366 goto out_addrinfo;
367 addrinfo->def.cipso = doi_def;
368 addrinfo->def.type = NETLBL_NLTYPE_CIPSOV4;
369 addrinfo->list.addr = addr->s_addr & mask->s_addr;
370 addrinfo->list.mask = mask->s_addr;
371 addrinfo->list.valid = 1;
372 ret_val = netlbl_af4list_add(&addrinfo->list, &addrmap->list4);
373 if (ret_val != 0)
374 goto cfg_cipsov4_map_add_failure;
375
376 entry->def.addrsel = addrmap;
377 entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
378 } else {
379 ret_val = -EINVAL;
380 goto out_addrmap;
381 }
382
383 ret_val = netlbl_domhsh_add(entry, audit_info);
384 if (ret_val != 0)
385 goto cfg_cipsov4_map_add_failure;
386
387 return 0;
388
389cfg_cipsov4_map_add_failure:
390 kfree(addrinfo);
391out_addrinfo:
392 kfree(addrmap);
393out_addrmap:
394 kfree(entry->domain);
395out_domain:
396 kfree(entry);
397out_entry:
398 cipso_v4_doi_putdef(doi_def);
399 return ret_val;
400}
401
402/*
403 * Security Attribute Functions
404 */
405
406#define _CM_F_NONE 0x00000000
407#define _CM_F_ALLOC 0x00000001
408#define _CM_F_WALK 0x00000002
409
410/**
411 * _netlbl_catmap_getnode - Get a individual node from a catmap
412 * @catmap: pointer to the category bitmap
413 * @offset: the requested offset
414 * @cm_flags: catmap flags, see _CM_F_*
415 * @gfp_flags: memory allocation flags
416 *
417 * Description:
418 * Iterate through the catmap looking for the node associated with @offset.
419 * If the _CM_F_ALLOC flag is set in @cm_flags and there is no associated node,
420 * one will be created and inserted into the catmap. If the _CM_F_WALK flag is
421 * set in @cm_flags and there is no associated node, the next highest node will
422 * be returned. Returns a pointer to the node on success, NULL on failure.
423 *
424 */
425static struct netlbl_lsm_catmap *_netlbl_catmap_getnode(
426 struct netlbl_lsm_catmap **catmap,
427 u32 offset,
428 unsigned int cm_flags,
429 gfp_t gfp_flags)
430{
431 struct netlbl_lsm_catmap *iter = *catmap;
432 struct netlbl_lsm_catmap *prev = NULL;
433
434 if (iter == NULL)
435 goto catmap_getnode_alloc;
436 if (offset < iter->startbit)
437 goto catmap_getnode_walk;
438 while (iter && offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
439 prev = iter;
440 iter = iter->next;
441 }
442 if (iter == NULL || offset < iter->startbit)
443 goto catmap_getnode_walk;
444
445 return iter;
446
447catmap_getnode_walk:
448 if (cm_flags & _CM_F_WALK)
449 return iter;
450catmap_getnode_alloc:
451 if (!(cm_flags & _CM_F_ALLOC))
452 return NULL;
453
454 iter = netlbl_catmap_alloc(gfp_flags);
455 if (iter == NULL)
456 return NULL;
457 iter->startbit = offset & ~(NETLBL_CATMAP_SIZE - 1);
458
459 if (prev == NULL) {
460 iter->next = *catmap;
461 *catmap = iter;
462 } else {
463 iter->next = prev->next;
464 prev->next = iter;
465 }
466
467 return iter;
468}
469
470/**
471 * netlbl_catmap_walk - Walk a LSM secattr catmap looking for a bit
472 * @catmap: the category bitmap
473 * @offset: the offset to start searching at, in bits
474 *
475 * Description:
476 * This function walks a LSM secattr category bitmap starting at @offset and
477 * returns the spot of the first set bit or -ENOENT if no bits are set.
478 *
479 */
480int netlbl_catmap_walk(struct netlbl_lsm_catmap *catmap, u32 offset)
481{
482 struct netlbl_lsm_catmap *iter = catmap;
483 u32 idx;
484 u32 bit;
485 NETLBL_CATMAP_MAPTYPE bitmap;
486
487 iter = _netlbl_catmap_getnode(&catmap, offset, _CM_F_WALK, 0);
488 if (iter == NULL)
489 return -ENOENT;
490 if (offset > iter->startbit) {
491 offset -= iter->startbit;
492 idx = offset / NETLBL_CATMAP_MAPSIZE;
493 bit = offset % NETLBL_CATMAP_MAPSIZE;
494 } else {
495 idx = 0;
496 bit = 0;
497 }
498 bitmap = iter->bitmap[idx] >> bit;
499
500 for (;;) {
501 if (bitmap != 0) {
502 while ((bitmap & NETLBL_CATMAP_BIT) == 0) {
503 bitmap >>= 1;
504 bit++;
505 }
506 return iter->startbit +
507 (NETLBL_CATMAP_MAPSIZE * idx) + bit;
508 }
509 if (++idx >= NETLBL_CATMAP_MAPCNT) {
510 if (iter->next != NULL) {
511 iter = iter->next;
512 idx = 0;
513 } else
514 return -ENOENT;
515 }
516 bitmap = iter->bitmap[idx];
517 bit = 0;
518 }
519
520 return -ENOENT;
521}
522
523/**
524 * netlbl_catmap_walkrng - Find the end of a string of set bits
525 * @catmap: the category bitmap
526 * @offset: the offset to start searching at, in bits
527 *
528 * Description:
529 * This function walks a LSM secattr category bitmap starting at @offset and
530 * returns the spot of the first cleared bit or -ENOENT if the offset is past
531 * the end of the bitmap.
532 *
533 */
534int netlbl_catmap_walkrng(struct netlbl_lsm_catmap *catmap, u32 offset)
535{
536 struct netlbl_lsm_catmap *iter;
537 struct netlbl_lsm_catmap *prev = NULL;
538 u32 idx;
539 u32 bit;
540 NETLBL_CATMAP_MAPTYPE bitmask;
541 NETLBL_CATMAP_MAPTYPE bitmap;
542
543 iter = _netlbl_catmap_getnode(&catmap, offset, _CM_F_WALK, 0);
544 if (iter == NULL)
545 return -ENOENT;
546 if (offset > iter->startbit) {
547 offset -= iter->startbit;
548 idx = offset / NETLBL_CATMAP_MAPSIZE;
549 bit = offset % NETLBL_CATMAP_MAPSIZE;
550 } else {
551 idx = 0;
552 bit = 0;
553 }
554 bitmask = NETLBL_CATMAP_BIT << bit;
555
556 for (;;) {
557 bitmap = iter->bitmap[idx];
558 while (bitmask != 0 && (bitmap & bitmask) != 0) {
559 bitmask <<= 1;
560 bit++;
561 }
562
563 if (prev && idx == 0 && bit == 0)
564 return prev->startbit + NETLBL_CATMAP_SIZE - 1;
565 else if (bitmask != 0)
566 return iter->startbit +
567 (NETLBL_CATMAP_MAPSIZE * idx) + bit - 1;
568 else if (++idx >= NETLBL_CATMAP_MAPCNT) {
569 if (iter->next == NULL)
570 return iter->startbit + NETLBL_CATMAP_SIZE - 1;
571 prev = iter;
572 iter = iter->next;
573 idx = 0;
574 }
575 bitmask = NETLBL_CATMAP_BIT;
576 bit = 0;
577 }
578
579 return -ENOENT;
580}
581
582/**
583 * netlbl_catmap_getlong - Export an unsigned long bitmap
584 * @catmap: pointer to the category bitmap
585 * @offset: pointer to the requested offset
586 * @bitmap: the exported bitmap
587 *
588 * Description:
589 * Export a bitmap with an offset greater than or equal to @offset and return
590 * it in @bitmap. The @offset must be aligned to an unsigned long and will be
591 * updated on return if different from what was requested; if the catmap is
592 * empty at the requested offset and beyond, the @offset is set to (u32)-1.
593 * Returns zero on sucess, negative values on failure.
594 *
595 */
596int netlbl_catmap_getlong(struct netlbl_lsm_catmap *catmap,
597 u32 *offset,
598 unsigned long *bitmap)
599{
600 struct netlbl_lsm_catmap *iter;
601 u32 off = *offset;
602 u32 idx;
603
604 /* only allow aligned offsets */
605 if ((off & (BITS_PER_LONG - 1)) != 0)
606 return -EINVAL;
607
608 if (off < catmap->startbit) {
609 off = catmap->startbit;
610 *offset = off;
611 }
612 iter = _netlbl_catmap_getnode(&catmap, off, _CM_F_NONE, 0);
613 if (iter == NULL) {
614 *offset = (u32)-1;
615 return 0;
616 }
617
618 if (off < iter->startbit) {
619 off = iter->startbit;
620 *offset = off;
621 } else
622 off -= iter->startbit;
623
624 idx = off / NETLBL_CATMAP_MAPSIZE;
625 *bitmap = iter->bitmap[idx] >> (off % NETLBL_CATMAP_SIZE);
626
627 return 0;
628}
629
630/**
631 * netlbl_catmap_setbit - Set a bit in a LSM secattr catmap
632 * @catmap: pointer to the category bitmap
633 * @bit: the bit to set
634 * @flags: memory allocation flags
635 *
636 * Description:
637 * Set the bit specified by @bit in @catmap. Returns zero on success,
638 * negative values on failure.
639 *
640 */
641int netlbl_catmap_setbit(struct netlbl_lsm_catmap **catmap,
642 u32 bit,
643 gfp_t flags)
644{
645 struct netlbl_lsm_catmap *iter;
646 u32 idx;
647
648 iter = _netlbl_catmap_getnode(catmap, bit, _CM_F_ALLOC, flags);
649 if (iter == NULL)
650 return -ENOMEM;
651
652 bit -= iter->startbit;
653 idx = bit / NETLBL_CATMAP_MAPSIZE;
654 iter->bitmap[idx] |= NETLBL_CATMAP_BIT << (bit % NETLBL_CATMAP_MAPSIZE);
655
656 return 0;
657}
658
659/**
660 * netlbl_catmap_setrng - Set a range of bits in a LSM secattr catmap
661 * @catmap: pointer to the category bitmap
662 * @start: the starting bit
663 * @end: the last bit in the string
664 * @flags: memory allocation flags
665 *
666 * Description:
667 * Set a range of bits, starting at @start and ending with @end. Returns zero
668 * on success, negative values on failure.
669 *
670 */
671int netlbl_catmap_setrng(struct netlbl_lsm_catmap **catmap,
672 u32 start,
673 u32 end,
674 gfp_t flags)
675{
676 int rc = 0;
677 u32 spot = start;
678
679 while (rc == 0 && spot <= end) {
680 if (((spot & (BITS_PER_LONG - 1)) != 0) &&
681 ((end - spot) > BITS_PER_LONG)) {
682 rc = netlbl_catmap_setlong(catmap,
683 spot,
684 (unsigned long)-1,
685 flags);
686 spot += BITS_PER_LONG;
687 } else
688 rc = netlbl_catmap_setbit(catmap, spot++, flags);
689 }
690
691 return rc;
692}
693
694/**
695 * netlbl_catmap_setlong - Import an unsigned long bitmap
696 * @catmap: pointer to the category bitmap
697 * @offset: offset to the start of the imported bitmap
698 * @bitmap: the bitmap to import
699 * @flags: memory allocation flags
700 *
701 * Description:
702 * Import the bitmap specified in @bitmap into @catmap, using the offset
703 * in @offset. The offset must be aligned to an unsigned long. Returns zero
704 * on success, negative values on failure.
705 *
706 */
707int netlbl_catmap_setlong(struct netlbl_lsm_catmap **catmap,
708 u32 offset,
709 unsigned long bitmap,
710 gfp_t flags)
711{
712 struct netlbl_lsm_catmap *iter;
713 u32 idx;
714
715 /* only allow aligned offsets */
716 if ((offset & (BITS_PER_LONG - 1)) != 0)
717 return -EINVAL;
718
719 iter = _netlbl_catmap_getnode(catmap, offset, _CM_F_ALLOC, flags);
720 if (iter == NULL)
721 return -ENOMEM;
722
723 offset -= iter->startbit;
724 idx = offset / NETLBL_CATMAP_MAPSIZE;
725 iter->bitmap[idx] |= bitmap << (offset % NETLBL_CATMAP_MAPSIZE);
726
727 return 0;
728}
729
730/*
731 * LSM Functions
732 */
733
734/**
735 * netlbl_enabled - Determine if the NetLabel subsystem is enabled
736 *
737 * Description:
738 * The LSM can use this function to determine if it should use NetLabel
739 * security attributes in it's enforcement mechanism. Currently, NetLabel is
740 * considered to be enabled when it's configuration contains a valid setup for
741 * at least one labeled protocol (i.e. NetLabel can understand incoming
742 * labeled packets of at least one type); otherwise NetLabel is considered to
743 * be disabled.
744 *
745 */
746int netlbl_enabled(void)
747{
748 /* At some point we probably want to expose this mechanism to the user
749 * as well so that admins can toggle NetLabel regardless of the
750 * configuration */
751 return (atomic_read(&netlabel_mgmt_protocount) > 0);
752}
753
754/**
755 * netlbl_sock_setattr - Label a socket using the correct protocol
756 * @sk: the socket to label
757 * @family: protocol family
758 * @secattr: the security attributes
759 *
760 * Description:
761 * Attach the correct label to the given socket using the security attributes
762 * specified in @secattr. This function requires exclusive access to @sk,
763 * which means it either needs to be in the process of being created or locked.
764 * Returns zero on success, -EDESTADDRREQ if the domain is configured to use
765 * network address selectors (can't blindly label the socket), and negative
766 * values on all other failures.
767 *
768 */
769int netlbl_sock_setattr(struct sock *sk,
770 u16 family,
771 const struct netlbl_lsm_secattr *secattr)
772{
773 int ret_val;
774 struct netlbl_dom_map *dom_entry;
775
776 rcu_read_lock();
777 dom_entry = netlbl_domhsh_getentry(secattr->domain);
778 if (dom_entry == NULL) {
779 ret_val = -ENOENT;
780 goto socket_setattr_return;
781 }
782 switch (family) {
783 case AF_INET:
784 switch (dom_entry->def.type) {
785 case NETLBL_NLTYPE_ADDRSELECT:
786 ret_val = -EDESTADDRREQ;
787 break;
788 case NETLBL_NLTYPE_CIPSOV4:
789 ret_val = cipso_v4_sock_setattr(sk,
790 dom_entry->def.cipso,
791 secattr);
792 break;
793 case NETLBL_NLTYPE_UNLABELED:
794 ret_val = 0;
795 break;
796 default:
797 ret_val = -ENOENT;
798 }
799 break;
800#if IS_ENABLED(CONFIG_IPV6)
801 case AF_INET6:
802 /* since we don't support any IPv6 labeling protocols right
803 * now we can optimize everything away until we do */
804 ret_val = 0;
805 break;
806#endif /* IPv6 */
807 default:
808 ret_val = -EPROTONOSUPPORT;
809 }
810
811socket_setattr_return:
812 rcu_read_unlock();
813 return ret_val;
814}
815
816/**
817 * netlbl_sock_delattr - Delete all the NetLabel labels on a socket
818 * @sk: the socket
819 *
820 * Description:
821 * Remove all the NetLabel labeling from @sk. The caller is responsible for
822 * ensuring that @sk is locked.
823 *
824 */
825void netlbl_sock_delattr(struct sock *sk)
826{
827 cipso_v4_sock_delattr(sk);
828}
829
830/**
831 * netlbl_sock_getattr - Determine the security attributes of a sock
832 * @sk: the sock
833 * @secattr: the security attributes
834 *
835 * Description:
836 * Examines the given sock to see if any NetLabel style labeling has been
837 * applied to the sock, if so it parses the socket label and returns the
838 * security attributes in @secattr. Returns zero on success, negative values
839 * on failure.
840 *
841 */
842int netlbl_sock_getattr(struct sock *sk,
843 struct netlbl_lsm_secattr *secattr)
844{
845 int ret_val;
846
847 switch (sk->sk_family) {
848 case AF_INET:
849 ret_val = cipso_v4_sock_getattr(sk, secattr);
850 break;
851#if IS_ENABLED(CONFIG_IPV6)
852 case AF_INET6:
853 ret_val = -ENOMSG;
854 break;
855#endif /* IPv6 */
856 default:
857 ret_val = -EPROTONOSUPPORT;
858 }
859
860 return ret_val;
861}
862
863/**
864 * netlbl_conn_setattr - Label a connected socket using the correct protocol
865 * @sk: the socket to label
866 * @addr: the destination address
867 * @secattr: the security attributes
868 *
869 * Description:
870 * Attach the correct label to the given connected socket using the security
871 * attributes specified in @secattr. The caller is responsible for ensuring
872 * that @sk is locked. Returns zero on success, negative values on failure.
873 *
874 */
875int netlbl_conn_setattr(struct sock *sk,
876 struct sockaddr *addr,
877 const struct netlbl_lsm_secattr *secattr)
878{
879 int ret_val;
880 struct sockaddr_in *addr4;
881 struct netlbl_dommap_def *entry;
882
883 rcu_read_lock();
884 switch (addr->sa_family) {
885 case AF_INET:
886 addr4 = (struct sockaddr_in *)addr;
887 entry = netlbl_domhsh_getentry_af4(secattr->domain,
888 addr4->sin_addr.s_addr);
889 if (entry == NULL) {
890 ret_val = -ENOENT;
891 goto conn_setattr_return;
892 }
893 switch (entry->type) {
894 case NETLBL_NLTYPE_CIPSOV4:
895 ret_val = cipso_v4_sock_setattr(sk,
896 entry->cipso, secattr);
897 break;
898 case NETLBL_NLTYPE_UNLABELED:
899 /* just delete the protocols we support for right now
900 * but we could remove other protocols if needed */
901 cipso_v4_sock_delattr(sk);
902 ret_val = 0;
903 break;
904 default:
905 ret_val = -ENOENT;
906 }
907 break;
908#if IS_ENABLED(CONFIG_IPV6)
909 case AF_INET6:
910 /* since we don't support any IPv6 labeling protocols right
911 * now we can optimize everything away until we do */
912 ret_val = 0;
913 break;
914#endif /* IPv6 */
915 default:
916 ret_val = -EPROTONOSUPPORT;
917 }
918
919conn_setattr_return:
920 rcu_read_unlock();
921 return ret_val;
922}
923
924/**
925 * netlbl_req_setattr - Label a request socket using the correct protocol
926 * @req: the request socket to label
927 * @secattr: the security attributes
928 *
929 * Description:
930 * Attach the correct label to the given socket using the security attributes
931 * specified in @secattr. Returns zero on success, negative values on failure.
932 *
933 */
934int netlbl_req_setattr(struct request_sock *req,
935 const struct netlbl_lsm_secattr *secattr)
936{
937 int ret_val;
938 struct netlbl_dommap_def *entry;
939
940 rcu_read_lock();
941 switch (req->rsk_ops->family) {
942 case AF_INET:
943 entry = netlbl_domhsh_getentry_af4(secattr->domain,
944 inet_rsk(req)->ir_rmt_addr);
945 if (entry == NULL) {
946 ret_val = -ENOENT;
947 goto req_setattr_return;
948 }
949 switch (entry->type) {
950 case NETLBL_NLTYPE_CIPSOV4:
951 ret_val = cipso_v4_req_setattr(req,
952 entry->cipso, secattr);
953 break;
954 case NETLBL_NLTYPE_UNLABELED:
955 /* just delete the protocols we support for right now
956 * but we could remove other protocols if needed */
957 cipso_v4_req_delattr(req);
958 ret_val = 0;
959 break;
960 default:
961 ret_val = -ENOENT;
962 }
963 break;
964#if IS_ENABLED(CONFIG_IPV6)
965 case AF_INET6:
966 /* since we don't support any IPv6 labeling protocols right
967 * now we can optimize everything away until we do */
968 ret_val = 0;
969 break;
970#endif /* IPv6 */
971 default:
972 ret_val = -EPROTONOSUPPORT;
973 }
974
975req_setattr_return:
976 rcu_read_unlock();
977 return ret_val;
978}
979
980/**
981* netlbl_req_delattr - Delete all the NetLabel labels on a socket
982* @req: the socket
983*
984* Description:
985* Remove all the NetLabel labeling from @req.
986*
987*/
988void netlbl_req_delattr(struct request_sock *req)
989{
990 cipso_v4_req_delattr(req);
991}
992
993/**
994 * netlbl_skbuff_setattr - Label a packet using the correct protocol
995 * @skb: the packet
996 * @family: protocol family
997 * @secattr: the security attributes
998 *
999 * Description:
1000 * Attach the correct label to the given packet using the security attributes
1001 * specified in @secattr. Returns zero on success, negative values on failure.
1002 *
1003 */
1004int netlbl_skbuff_setattr(struct sk_buff *skb,
1005 u16 family,
1006 const struct netlbl_lsm_secattr *secattr)
1007{
1008 int ret_val;
1009 struct iphdr *hdr4;
1010 struct netlbl_dommap_def *entry;
1011
1012 rcu_read_lock();
1013 switch (family) {
1014 case AF_INET:
1015 hdr4 = ip_hdr(skb);
1016 entry = netlbl_domhsh_getentry_af4(secattr->domain,hdr4->daddr);
1017 if (entry == NULL) {
1018 ret_val = -ENOENT;
1019 goto skbuff_setattr_return;
1020 }
1021 switch (entry->type) {
1022 case NETLBL_NLTYPE_CIPSOV4:
1023 ret_val = cipso_v4_skbuff_setattr(skb, entry->cipso,
1024 secattr);
1025 break;
1026 case NETLBL_NLTYPE_UNLABELED:
1027 /* just delete the protocols we support for right now
1028 * but we could remove other protocols if needed */
1029 ret_val = cipso_v4_skbuff_delattr(skb);
1030 break;
1031 default:
1032 ret_val = -ENOENT;
1033 }
1034 break;
1035#if IS_ENABLED(CONFIG_IPV6)
1036 case AF_INET6:
1037 /* since we don't support any IPv6 labeling protocols right
1038 * now we can optimize everything away until we do */
1039 ret_val = 0;
1040 break;
1041#endif /* IPv6 */
1042 default:
1043 ret_val = -EPROTONOSUPPORT;
1044 }
1045
1046skbuff_setattr_return:
1047 rcu_read_unlock();
1048 return ret_val;
1049}
1050
1051/**
1052 * netlbl_skbuff_getattr - Determine the security attributes of a packet
1053 * @skb: the packet
1054 * @family: protocol family
1055 * @secattr: the security attributes
1056 *
1057 * Description:
1058 * Examines the given packet to see if a recognized form of packet labeling
1059 * is present, if so it parses the packet label and returns the security
1060 * attributes in @secattr. Returns zero on success, negative values on
1061 * failure.
1062 *
1063 */
1064int netlbl_skbuff_getattr(const struct sk_buff *skb,
1065 u16 family,
1066 struct netlbl_lsm_secattr *secattr)
1067{
1068 unsigned char *ptr;
1069
1070 switch (family) {
1071 case AF_INET:
1072 ptr = cipso_v4_optptr(skb);
1073 if (ptr && cipso_v4_getattr(ptr, secattr) == 0)
1074 return 0;
1075 break;
1076#if IS_ENABLED(CONFIG_IPV6)
1077 case AF_INET6:
1078 break;
1079#endif /* IPv6 */
1080 }
1081
1082 return netlbl_unlabel_getattr(skb, family, secattr);
1083}
1084
1085/**
1086 * netlbl_skbuff_err - Handle a LSM error on a sk_buff
1087 * @skb: the packet
1088 * @error: the error code
1089 * @gateway: true if host is acting as a gateway, false otherwise
1090 *
1091 * Description:
1092 * Deal with a LSM problem when handling the packet in @skb, typically this is
1093 * a permission denied problem (-EACCES). The correct action is determined
1094 * according to the packet's labeling protocol.
1095 *
1096 */
1097void netlbl_skbuff_err(struct sk_buff *skb, int error, int gateway)
1098{
1099 if (cipso_v4_optptr(skb))
1100 cipso_v4_error(skb, error, gateway);
1101}
1102
1103/**
1104 * netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches
1105 *
1106 * Description:
1107 * For all of the NetLabel protocols that support some form of label mapping
1108 * cache, invalidate the cache. Returns zero on success, negative values on
1109 * error.
1110 *
1111 */
1112void netlbl_cache_invalidate(void)
1113{
1114 cipso_v4_cache_invalidate();
1115}
1116
1117/**
1118 * netlbl_cache_add - Add an entry to a NetLabel protocol cache
1119 * @skb: the packet
1120 * @secattr: the packet's security attributes
1121 *
1122 * Description:
1123 * Add the LSM security attributes for the given packet to the underlying
1124 * NetLabel protocol's label mapping cache. Returns zero on success, negative
1125 * values on error.
1126 *
1127 */
1128int netlbl_cache_add(const struct sk_buff *skb,
1129 const struct netlbl_lsm_secattr *secattr)
1130{
1131 unsigned char *ptr;
1132
1133 if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0)
1134 return -ENOMSG;
1135
1136 ptr = cipso_v4_optptr(skb);
1137 if (ptr)
1138 return cipso_v4_cache_add(ptr, secattr);
1139
1140 return -ENOMSG;
1141}
1142
1143/*
1144 * Protocol Engine Functions
1145 */
1146
1147/**
1148 * netlbl_audit_start - Start an audit message
1149 * @type: audit message type
1150 * @audit_info: NetLabel audit information
1151 *
1152 * Description:
1153 * Start an audit message using the type specified in @type and fill the audit
1154 * message with some fields common to all NetLabel audit messages. This
1155 * function should only be used by protocol engines, not LSMs. Returns a
1156 * pointer to the audit buffer on success, NULL on failure.
1157 *
1158 */
1159struct audit_buffer *netlbl_audit_start(int type,
1160 struct netlbl_audit *audit_info)
1161{
1162 return netlbl_audit_start_common(type, audit_info);
1163}
1164
1165/*
1166 * Setup Functions
1167 */
1168
1169/**
1170 * netlbl_init - Initialize NetLabel
1171 *
1172 * Description:
1173 * Perform the required NetLabel initialization before first use.
1174 *
1175 */
1176static int __init netlbl_init(void)
1177{
1178 int ret_val;
1179
1180 printk(KERN_INFO "NetLabel: Initializing\n");
1181 printk(KERN_INFO "NetLabel: domain hash size = %u\n",
1182 (1 << NETLBL_DOMHSH_BITSIZE));
1183 printk(KERN_INFO "NetLabel: protocols ="
1184 " UNLABELED"
1185 " CIPSOv4"
1186 "\n");
1187
1188 ret_val = netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE);
1189 if (ret_val != 0)
1190 goto init_failure;
1191
1192 ret_val = netlbl_unlabel_init(NETLBL_UNLHSH_BITSIZE);
1193 if (ret_val != 0)
1194 goto init_failure;
1195
1196 ret_val = netlbl_netlink_init();
1197 if (ret_val != 0)
1198 goto init_failure;
1199
1200 ret_val = netlbl_unlabel_defconf();
1201 if (ret_val != 0)
1202 goto init_failure;
1203 printk(KERN_INFO "NetLabel: unlabeled traffic allowed by default\n");
1204
1205 return 0;
1206
1207init_failure:
1208 panic("NetLabel: failed to initialize properly (%d)\n", ret_val);
1209}
1210
1211subsys_initcall(netlbl_init);