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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * NetLabel Kernel API
4 *
5 * This file defines the kernel API for the NetLabel system. The NetLabel
6 * system manages static and dynamic label mappings for network protocols such
7 * as CIPSO and RIPSO.
8 *
9 * Author: Paul Moore <paul@paul-moore.com>
10 */
11
12/*
13 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008
14 */
15
16#include <linux/init.h>
17#include <linux/types.h>
18#include <linux/slab.h>
19#include <linux/audit.h>
20#include <linux/in.h>
21#include <linux/in6.h>
22#include <net/ip.h>
23#include <net/ipv6.h>
24#include <net/netlabel.h>
25#include <net/cipso_ipv4.h>
26#include <net/calipso.h>
27#include <asm/bug.h>
28#include <linux/atomic.h>
29
30#include "netlabel_domainhash.h"
31#include "netlabel_unlabeled.h"
32#include "netlabel_cipso_v4.h"
33#include "netlabel_calipso.h"
34#include "netlabel_user.h"
35#include "netlabel_mgmt.h"
36#include "netlabel_addrlist.h"
37
38/*
39 * Configuration Functions
40 */
41
42/**
43 * netlbl_cfg_map_del - Remove a NetLabel/LSM domain mapping
44 * @domain: the domain mapping to remove
45 * @family: address family
46 * @addr: IP address
47 * @mask: IP address mask
48 * @audit_info: NetLabel audit information
49 *
50 * Description:
51 * Removes a NetLabel/LSM domain mapping. A @domain value of NULL causes the
52 * default domain mapping to be removed. Returns zero on success, negative
53 * values on failure.
54 *
55 */
56int netlbl_cfg_map_del(const char *domain,
57 u16 family,
58 const void *addr,
59 const void *mask,
60 struct netlbl_audit *audit_info)
61{
62 if (addr == NULL && mask == NULL) {
63 return netlbl_domhsh_remove(domain, family, audit_info);
64 } else if (addr != NULL && mask != NULL) {
65 switch (family) {
66 case AF_INET:
67 return netlbl_domhsh_remove_af4(domain, addr, mask,
68 audit_info);
69#if IS_ENABLED(CONFIG_IPV6)
70 case AF_INET6:
71 return netlbl_domhsh_remove_af6(domain, addr, mask,
72 audit_info);
73#endif /* IPv6 */
74 default:
75 return -EPFNOSUPPORT;
76 }
77 } else
78 return -EINVAL;
79}
80
81/**
82 * netlbl_cfg_unlbl_map_add - Add a new unlabeled mapping
83 * @domain: the domain mapping to add
84 * @family: address family
85 * @addr: IP address
86 * @mask: IP address mask
87 * @audit_info: NetLabel audit information
88 *
89 * Description:
90 * Adds a new unlabeled NetLabel/LSM domain mapping. A @domain value of NULL
91 * causes a new default domain mapping to be added. Returns zero on success,
92 * negative values on failure.
93 *
94 */
95int netlbl_cfg_unlbl_map_add(const char *domain,
96 u16 family,
97 const void *addr,
98 const void *mask,
99 struct netlbl_audit *audit_info)
100{
101 int ret_val = -ENOMEM;
102 struct netlbl_dom_map *entry;
103 struct netlbl_domaddr_map *addrmap = NULL;
104 struct netlbl_domaddr4_map *map4 = NULL;
105 struct netlbl_domaddr6_map *map6 = NULL;
106
107 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
108 if (entry == NULL)
109 return -ENOMEM;
110 if (domain != NULL) {
111 entry->domain = kstrdup(domain, GFP_ATOMIC);
112 if (entry->domain == NULL)
113 goto cfg_unlbl_map_add_failure;
114 }
115 entry->family = family;
116
117 if (addr == NULL && mask == NULL)
118 entry->def.type = NETLBL_NLTYPE_UNLABELED;
119 else if (addr != NULL && mask != NULL) {
120 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
121 if (addrmap == NULL)
122 goto cfg_unlbl_map_add_failure;
123 INIT_LIST_HEAD(&addrmap->list4);
124 INIT_LIST_HEAD(&addrmap->list6);
125
126 switch (family) {
127 case AF_INET: {
128 const struct in_addr *addr4 = addr;
129 const struct in_addr *mask4 = mask;
130 map4 = kzalloc(sizeof(*map4), GFP_ATOMIC);
131 if (map4 == NULL)
132 goto cfg_unlbl_map_add_failure;
133 map4->def.type = NETLBL_NLTYPE_UNLABELED;
134 map4->list.addr = addr4->s_addr & mask4->s_addr;
135 map4->list.mask = mask4->s_addr;
136 map4->list.valid = 1;
137 ret_val = netlbl_af4list_add(&map4->list,
138 &addrmap->list4);
139 if (ret_val != 0)
140 goto cfg_unlbl_map_add_failure;
141 break;
142 }
143#if IS_ENABLED(CONFIG_IPV6)
144 case AF_INET6: {
145 const struct in6_addr *addr6 = addr;
146 const struct in6_addr *mask6 = mask;
147 map6 = kzalloc(sizeof(*map6), GFP_ATOMIC);
148 if (map6 == NULL)
149 goto cfg_unlbl_map_add_failure;
150 map6->def.type = NETLBL_NLTYPE_UNLABELED;
151 map6->list.addr = *addr6;
152 map6->list.addr.s6_addr32[0] &= mask6->s6_addr32[0];
153 map6->list.addr.s6_addr32[1] &= mask6->s6_addr32[1];
154 map6->list.addr.s6_addr32[2] &= mask6->s6_addr32[2];
155 map6->list.addr.s6_addr32[3] &= mask6->s6_addr32[3];
156 map6->list.mask = *mask6;
157 map6->list.valid = 1;
158 ret_val = netlbl_af6list_add(&map6->list,
159 &addrmap->list6);
160 if (ret_val != 0)
161 goto cfg_unlbl_map_add_failure;
162 break;
163 }
164#endif /* IPv6 */
165 default:
166 goto cfg_unlbl_map_add_failure;
167 }
168
169 entry->def.addrsel = addrmap;
170 entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
171 } else {
172 ret_val = -EINVAL;
173 goto cfg_unlbl_map_add_failure;
174 }
175
176 ret_val = netlbl_domhsh_add(entry, audit_info);
177 if (ret_val != 0)
178 goto cfg_unlbl_map_add_failure;
179
180 return 0;
181
182cfg_unlbl_map_add_failure:
183 kfree(entry->domain);
184 kfree(entry);
185 kfree(addrmap);
186 kfree(map4);
187 kfree(map6);
188 return ret_val;
189}
190
191
192/**
193 * netlbl_cfg_unlbl_static_add - Adds a new static label
194 * @net: network namespace
195 * @dev_name: interface name
196 * @addr: IP address in network byte order (struct in[6]_addr)
197 * @mask: address mask in network byte order (struct in[6]_addr)
198 * @family: address family
199 * @secid: LSM secid value for the entry
200 * @audit_info: NetLabel audit information
201 *
202 * Description:
203 * Adds a new NetLabel static label to be used when protocol provided labels
204 * are not present on incoming traffic. If @dev_name is NULL then the default
205 * interface will be used. Returns zero on success, negative values on failure.
206 *
207 */
208int netlbl_cfg_unlbl_static_add(struct net *net,
209 const char *dev_name,
210 const void *addr,
211 const void *mask,
212 u16 family,
213 u32 secid,
214 struct netlbl_audit *audit_info)
215{
216 u32 addr_len;
217
218 switch (family) {
219 case AF_INET:
220 addr_len = sizeof(struct in_addr);
221 break;
222#if IS_ENABLED(CONFIG_IPV6)
223 case AF_INET6:
224 addr_len = sizeof(struct in6_addr);
225 break;
226#endif /* IPv6 */
227 default:
228 return -EPFNOSUPPORT;
229 }
230
231 return netlbl_unlhsh_add(net,
232 dev_name, addr, mask, addr_len,
233 secid, audit_info);
234}
235
236/**
237 * netlbl_cfg_unlbl_static_del - Removes an existing static label
238 * @net: network namespace
239 * @dev_name: interface name
240 * @addr: IP address in network byte order (struct in[6]_addr)
241 * @mask: address mask in network byte order (struct in[6]_addr)
242 * @family: address family
243 * @audit_info: NetLabel audit information
244 *
245 * Description:
246 * Removes an existing NetLabel static label used when protocol provided labels
247 * are not present on incoming traffic. If @dev_name is NULL then the default
248 * interface will be used. Returns zero on success, negative values on failure.
249 *
250 */
251int netlbl_cfg_unlbl_static_del(struct net *net,
252 const char *dev_name,
253 const void *addr,
254 const void *mask,
255 u16 family,
256 struct netlbl_audit *audit_info)
257{
258 u32 addr_len;
259
260 switch (family) {
261 case AF_INET:
262 addr_len = sizeof(struct in_addr);
263 break;
264#if IS_ENABLED(CONFIG_IPV6)
265 case AF_INET6:
266 addr_len = sizeof(struct in6_addr);
267 break;
268#endif /* IPv6 */
269 default:
270 return -EPFNOSUPPORT;
271 }
272
273 return netlbl_unlhsh_remove(net,
274 dev_name, addr, mask, addr_len,
275 audit_info);
276}
277
278/**
279 * netlbl_cfg_cipsov4_add - Add a new CIPSOv4 DOI definition
280 * @doi_def: CIPSO DOI definition
281 * @audit_info: NetLabel audit information
282 *
283 * Description:
284 * Add a new CIPSO DOI definition as defined by @doi_def. Returns zero on
285 * success and negative values on failure.
286 *
287 */
288int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def,
289 struct netlbl_audit *audit_info)
290{
291 return cipso_v4_doi_add(doi_def, audit_info);
292}
293
294/**
295 * netlbl_cfg_cipsov4_del - Remove an existing CIPSOv4 DOI definition
296 * @doi: CIPSO DOI
297 * @audit_info: NetLabel audit information
298 *
299 * Description:
300 * Remove an existing CIPSO DOI definition matching @doi. Returns zero on
301 * success and negative values on failure.
302 *
303 */
304void netlbl_cfg_cipsov4_del(u32 doi, struct netlbl_audit *audit_info)
305{
306 cipso_v4_doi_remove(doi, audit_info);
307}
308
309/**
310 * netlbl_cfg_cipsov4_map_add - Add a new CIPSOv4 DOI mapping
311 * @doi: the CIPSO DOI
312 * @domain: the domain mapping to add
313 * @addr: IP address
314 * @mask: IP address mask
315 * @audit_info: NetLabel audit information
316 *
317 * Description:
318 * Add a new NetLabel/LSM domain mapping for the given CIPSO DOI to the NetLabel
319 * subsystem. A @domain value of NULL adds a new default domain mapping.
320 * Returns zero on success, negative values on failure.
321 *
322 */
323int netlbl_cfg_cipsov4_map_add(u32 doi,
324 const char *domain,
325 const struct in_addr *addr,
326 const struct in_addr *mask,
327 struct netlbl_audit *audit_info)
328{
329 int ret_val = -ENOMEM;
330 struct cipso_v4_doi *doi_def;
331 struct netlbl_dom_map *entry;
332 struct netlbl_domaddr_map *addrmap = NULL;
333 struct netlbl_domaddr4_map *addrinfo = NULL;
334
335 doi_def = cipso_v4_doi_getdef(doi);
336 if (doi_def == NULL)
337 return -ENOENT;
338
339 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
340 if (entry == NULL)
341 goto out_entry;
342 entry->family = AF_INET;
343 if (domain != NULL) {
344 entry->domain = kstrdup(domain, GFP_ATOMIC);
345 if (entry->domain == NULL)
346 goto out_domain;
347 }
348
349 if (addr == NULL && mask == NULL) {
350 entry->def.cipso = doi_def;
351 entry->def.type = NETLBL_NLTYPE_CIPSOV4;
352 } else if (addr != NULL && mask != NULL) {
353 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
354 if (addrmap == NULL)
355 goto out_addrmap;
356 INIT_LIST_HEAD(&addrmap->list4);
357 INIT_LIST_HEAD(&addrmap->list6);
358
359 addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC);
360 if (addrinfo == NULL)
361 goto out_addrinfo;
362 addrinfo->def.cipso = doi_def;
363 addrinfo->def.type = NETLBL_NLTYPE_CIPSOV4;
364 addrinfo->list.addr = addr->s_addr & mask->s_addr;
365 addrinfo->list.mask = mask->s_addr;
366 addrinfo->list.valid = 1;
367 ret_val = netlbl_af4list_add(&addrinfo->list, &addrmap->list4);
368 if (ret_val != 0)
369 goto cfg_cipsov4_map_add_failure;
370
371 entry->def.addrsel = addrmap;
372 entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
373 } else {
374 ret_val = -EINVAL;
375 goto out_addrmap;
376 }
377
378 ret_val = netlbl_domhsh_add(entry, audit_info);
379 if (ret_val != 0)
380 goto cfg_cipsov4_map_add_failure;
381
382 return 0;
383
384cfg_cipsov4_map_add_failure:
385 kfree(addrinfo);
386out_addrinfo:
387 kfree(addrmap);
388out_addrmap:
389 kfree(entry->domain);
390out_domain:
391 kfree(entry);
392out_entry:
393 cipso_v4_doi_putdef(doi_def);
394 return ret_val;
395}
396
397/**
398 * netlbl_cfg_calipso_add - Add a new CALIPSO DOI definition
399 * @doi_def: CALIPSO DOI definition
400 * @audit_info: NetLabel audit information
401 *
402 * Description:
403 * Add a new CALIPSO DOI definition as defined by @doi_def. Returns zero on
404 * success and negative values on failure.
405 *
406 */
407int netlbl_cfg_calipso_add(struct calipso_doi *doi_def,
408 struct netlbl_audit *audit_info)
409{
410#if IS_ENABLED(CONFIG_IPV6)
411 return calipso_doi_add(doi_def, audit_info);
412#else /* IPv6 */
413 return -ENOSYS;
414#endif /* IPv6 */
415}
416
417/**
418 * netlbl_cfg_calipso_del - Remove an existing CALIPSO DOI definition
419 * @doi: CALIPSO DOI
420 * @audit_info: NetLabel audit information
421 *
422 * Description:
423 * Remove an existing CALIPSO DOI definition matching @doi. Returns zero on
424 * success and negative values on failure.
425 *
426 */
427void netlbl_cfg_calipso_del(u32 doi, struct netlbl_audit *audit_info)
428{
429#if IS_ENABLED(CONFIG_IPV6)
430 calipso_doi_remove(doi, audit_info);
431#endif /* IPv6 */
432}
433
434/**
435 * netlbl_cfg_calipso_map_add - Add a new CALIPSO DOI mapping
436 * @doi: the CALIPSO DOI
437 * @domain: the domain mapping to add
438 * @addr: IP address
439 * @mask: IP address mask
440 * @audit_info: NetLabel audit information
441 *
442 * Description:
443 * Add a new NetLabel/LSM domain mapping for the given CALIPSO DOI to the
444 * NetLabel subsystem. A @domain value of NULL adds a new default domain
445 * mapping. Returns zero on success, negative values on failure.
446 *
447 */
448int netlbl_cfg_calipso_map_add(u32 doi,
449 const char *domain,
450 const struct in6_addr *addr,
451 const struct in6_addr *mask,
452 struct netlbl_audit *audit_info)
453{
454#if IS_ENABLED(CONFIG_IPV6)
455 int ret_val = -ENOMEM;
456 struct calipso_doi *doi_def;
457 struct netlbl_dom_map *entry;
458 struct netlbl_domaddr_map *addrmap = NULL;
459 struct netlbl_domaddr6_map *addrinfo = NULL;
460
461 doi_def = calipso_doi_getdef(doi);
462 if (doi_def == NULL)
463 return -ENOENT;
464
465 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
466 if (entry == NULL)
467 goto out_entry;
468 entry->family = AF_INET6;
469 if (domain != NULL) {
470 entry->domain = kstrdup(domain, GFP_ATOMIC);
471 if (entry->domain == NULL)
472 goto out_domain;
473 }
474
475 if (addr == NULL && mask == NULL) {
476 entry->def.calipso = doi_def;
477 entry->def.type = NETLBL_NLTYPE_CALIPSO;
478 } else if (addr != NULL && mask != NULL) {
479 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
480 if (addrmap == NULL)
481 goto out_addrmap;
482 INIT_LIST_HEAD(&addrmap->list4);
483 INIT_LIST_HEAD(&addrmap->list6);
484
485 addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC);
486 if (addrinfo == NULL)
487 goto out_addrinfo;
488 addrinfo->def.calipso = doi_def;
489 addrinfo->def.type = NETLBL_NLTYPE_CALIPSO;
490 addrinfo->list.addr = *addr;
491 addrinfo->list.addr.s6_addr32[0] &= mask->s6_addr32[0];
492 addrinfo->list.addr.s6_addr32[1] &= mask->s6_addr32[1];
493 addrinfo->list.addr.s6_addr32[2] &= mask->s6_addr32[2];
494 addrinfo->list.addr.s6_addr32[3] &= mask->s6_addr32[3];
495 addrinfo->list.mask = *mask;
496 addrinfo->list.valid = 1;
497 ret_val = netlbl_af6list_add(&addrinfo->list, &addrmap->list6);
498 if (ret_val != 0)
499 goto cfg_calipso_map_add_failure;
500
501 entry->def.addrsel = addrmap;
502 entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
503 } else {
504 ret_val = -EINVAL;
505 goto out_addrmap;
506 }
507
508 ret_val = netlbl_domhsh_add(entry, audit_info);
509 if (ret_val != 0)
510 goto cfg_calipso_map_add_failure;
511
512 return 0;
513
514cfg_calipso_map_add_failure:
515 kfree(addrinfo);
516out_addrinfo:
517 kfree(addrmap);
518out_addrmap:
519 kfree(entry->domain);
520out_domain:
521 kfree(entry);
522out_entry:
523 calipso_doi_putdef(doi_def);
524 return ret_val;
525#else /* IPv6 */
526 return -ENOSYS;
527#endif /* IPv6 */
528}
529
530/*
531 * Security Attribute Functions
532 */
533
534#define _CM_F_NONE 0x00000000
535#define _CM_F_ALLOC 0x00000001
536#define _CM_F_WALK 0x00000002
537
538/**
539 * _netlbl_catmap_getnode - Get a individual node from a catmap
540 * @catmap: pointer to the category bitmap
541 * @offset: the requested offset
542 * @cm_flags: catmap flags, see _CM_F_*
543 * @gfp_flags: memory allocation flags
544 *
545 * Description:
546 * Iterate through the catmap looking for the node associated with @offset.
547 * If the _CM_F_ALLOC flag is set in @cm_flags and there is no associated node,
548 * one will be created and inserted into the catmap. If the _CM_F_WALK flag is
549 * set in @cm_flags and there is no associated node, the next highest node will
550 * be returned. Returns a pointer to the node on success, NULL on failure.
551 *
552 */
553static struct netlbl_lsm_catmap *_netlbl_catmap_getnode(
554 struct netlbl_lsm_catmap **catmap,
555 u32 offset,
556 unsigned int cm_flags,
557 gfp_t gfp_flags)
558{
559 struct netlbl_lsm_catmap *iter = *catmap;
560 struct netlbl_lsm_catmap *prev = NULL;
561
562 if (iter == NULL)
563 goto catmap_getnode_alloc;
564 if (offset < iter->startbit)
565 goto catmap_getnode_walk;
566 while (iter && offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
567 prev = iter;
568 iter = iter->next;
569 }
570 if (iter == NULL || offset < iter->startbit)
571 goto catmap_getnode_walk;
572
573 return iter;
574
575catmap_getnode_walk:
576 if (cm_flags & _CM_F_WALK)
577 return iter;
578catmap_getnode_alloc:
579 if (!(cm_flags & _CM_F_ALLOC))
580 return NULL;
581
582 iter = netlbl_catmap_alloc(gfp_flags);
583 if (iter == NULL)
584 return NULL;
585 iter->startbit = offset & ~(NETLBL_CATMAP_SIZE - 1);
586
587 if (prev == NULL) {
588 iter->next = *catmap;
589 *catmap = iter;
590 } else {
591 iter->next = prev->next;
592 prev->next = iter;
593 }
594
595 return iter;
596}
597
598/**
599 * netlbl_catmap_walk - Walk a LSM secattr catmap looking for a bit
600 * @catmap: the category bitmap
601 * @offset: the offset to start searching at, in bits
602 *
603 * Description:
604 * This function walks a LSM secattr category bitmap starting at @offset and
605 * returns the spot of the first set bit or -ENOENT if no bits are set.
606 *
607 */
608int netlbl_catmap_walk(struct netlbl_lsm_catmap *catmap, u32 offset)
609{
610 struct netlbl_lsm_catmap *iter;
611 u32 idx;
612 u32 bit;
613 u64 bitmap;
614
615 iter = _netlbl_catmap_getnode(&catmap, offset, _CM_F_WALK, 0);
616 if (iter == NULL)
617 return -ENOENT;
618 if (offset > iter->startbit) {
619 offset -= iter->startbit;
620 idx = offset / NETLBL_CATMAP_MAPSIZE;
621 bit = offset % NETLBL_CATMAP_MAPSIZE;
622 } else {
623 idx = 0;
624 bit = 0;
625 }
626 bitmap = iter->bitmap[idx] >> bit;
627
628 for (;;) {
629 if (bitmap != 0) {
630 while ((bitmap & NETLBL_CATMAP_BIT) == 0) {
631 bitmap >>= 1;
632 bit++;
633 }
634 return iter->startbit +
635 (NETLBL_CATMAP_MAPSIZE * idx) + bit;
636 }
637 if (++idx >= NETLBL_CATMAP_MAPCNT) {
638 if (iter->next != NULL) {
639 iter = iter->next;
640 idx = 0;
641 } else
642 return -ENOENT;
643 }
644 bitmap = iter->bitmap[idx];
645 bit = 0;
646 }
647
648 return -ENOENT;
649}
650EXPORT_SYMBOL(netlbl_catmap_walk);
651
652/**
653 * netlbl_catmap_walkrng - Find the end of a string of set bits
654 * @catmap: the category bitmap
655 * @offset: the offset to start searching at, in bits
656 *
657 * Description:
658 * This function walks a LSM secattr category bitmap starting at @offset and
659 * returns the spot of the first cleared bit or -ENOENT if the offset is past
660 * the end of the bitmap.
661 *
662 */
663int netlbl_catmap_walkrng(struct netlbl_lsm_catmap *catmap, u32 offset)
664{
665 struct netlbl_lsm_catmap *iter;
666 struct netlbl_lsm_catmap *prev = NULL;
667 u32 idx;
668 u32 bit;
669 u64 bitmask;
670 u64 bitmap;
671
672 iter = _netlbl_catmap_getnode(&catmap, offset, _CM_F_WALK, 0);
673 if (iter == NULL)
674 return -ENOENT;
675 if (offset > iter->startbit) {
676 offset -= iter->startbit;
677 idx = offset / NETLBL_CATMAP_MAPSIZE;
678 bit = offset % NETLBL_CATMAP_MAPSIZE;
679 } else {
680 idx = 0;
681 bit = 0;
682 }
683 bitmask = NETLBL_CATMAP_BIT << bit;
684
685 for (;;) {
686 bitmap = iter->bitmap[idx];
687 while (bitmask != 0 && (bitmap & bitmask) != 0) {
688 bitmask <<= 1;
689 bit++;
690 }
691
692 if (prev && idx == 0 && bit == 0)
693 return prev->startbit + NETLBL_CATMAP_SIZE - 1;
694 else if (bitmask != 0)
695 return iter->startbit +
696 (NETLBL_CATMAP_MAPSIZE * idx) + bit - 1;
697 else if (++idx >= NETLBL_CATMAP_MAPCNT) {
698 if (iter->next == NULL)
699 return iter->startbit + NETLBL_CATMAP_SIZE - 1;
700 prev = iter;
701 iter = iter->next;
702 idx = 0;
703 }
704 bitmask = NETLBL_CATMAP_BIT;
705 bit = 0;
706 }
707
708 return -ENOENT;
709}
710
711/**
712 * netlbl_catmap_getlong - Export an unsigned long bitmap
713 * @catmap: pointer to the category bitmap
714 * @offset: pointer to the requested offset
715 * @bitmap: the exported bitmap
716 *
717 * Description:
718 * Export a bitmap with an offset greater than or equal to @offset and return
719 * it in @bitmap. The @offset must be aligned to an unsigned long and will be
720 * updated on return if different from what was requested; if the catmap is
721 * empty at the requested offset and beyond, the @offset is set to (u32)-1.
722 * Returns zero on success, negative values on failure.
723 *
724 */
725int netlbl_catmap_getlong(struct netlbl_lsm_catmap *catmap,
726 u32 *offset,
727 unsigned long *bitmap)
728{
729 struct netlbl_lsm_catmap *iter;
730 u32 off = *offset;
731 u32 idx;
732
733 /* only allow aligned offsets */
734 if ((off & (BITS_PER_LONG - 1)) != 0)
735 return -EINVAL;
736
737 /* a null catmap is equivalent to an empty one */
738 if (!catmap) {
739 *offset = (u32)-1;
740 return 0;
741 }
742
743 if (off < catmap->startbit) {
744 off = catmap->startbit;
745 *offset = off;
746 }
747 iter = _netlbl_catmap_getnode(&catmap, off, _CM_F_WALK, 0);
748 if (iter == NULL) {
749 *offset = (u32)-1;
750 return 0;
751 }
752
753 if (off < iter->startbit) {
754 *offset = iter->startbit;
755 off = 0;
756 } else
757 off -= iter->startbit;
758 idx = off / NETLBL_CATMAP_MAPSIZE;
759 *bitmap = iter->bitmap[idx] >> (off % NETLBL_CATMAP_MAPSIZE);
760
761 return 0;
762}
763
764/**
765 * netlbl_catmap_setbit - Set a bit in a LSM secattr catmap
766 * @catmap: pointer to the category bitmap
767 * @bit: the bit to set
768 * @flags: memory allocation flags
769 *
770 * Description:
771 * Set the bit specified by @bit in @catmap. Returns zero on success,
772 * negative values on failure.
773 *
774 */
775int netlbl_catmap_setbit(struct netlbl_lsm_catmap **catmap,
776 u32 bit,
777 gfp_t flags)
778{
779 struct netlbl_lsm_catmap *iter;
780 u32 idx;
781
782 iter = _netlbl_catmap_getnode(catmap, bit, _CM_F_ALLOC, flags);
783 if (iter == NULL)
784 return -ENOMEM;
785
786 bit -= iter->startbit;
787 idx = bit / NETLBL_CATMAP_MAPSIZE;
788 iter->bitmap[idx] |= NETLBL_CATMAP_BIT << (bit % NETLBL_CATMAP_MAPSIZE);
789
790 return 0;
791}
792EXPORT_SYMBOL(netlbl_catmap_setbit);
793
794/**
795 * netlbl_catmap_setrng - Set a range of bits in a LSM secattr catmap
796 * @catmap: pointer to the category bitmap
797 * @start: the starting bit
798 * @end: the last bit in the string
799 * @flags: memory allocation flags
800 *
801 * Description:
802 * Set a range of bits, starting at @start and ending with @end. Returns zero
803 * on success, negative values on failure.
804 *
805 */
806int netlbl_catmap_setrng(struct netlbl_lsm_catmap **catmap,
807 u32 start,
808 u32 end,
809 gfp_t flags)
810{
811 int rc = 0;
812 u32 spot = start;
813
814 while (rc == 0 && spot <= end) {
815 if (((spot & (BITS_PER_LONG - 1)) == 0) &&
816 ((end - spot) > BITS_PER_LONG)) {
817 rc = netlbl_catmap_setlong(catmap,
818 spot,
819 (unsigned long)-1,
820 flags);
821 spot += BITS_PER_LONG;
822 } else
823 rc = netlbl_catmap_setbit(catmap, spot++, flags);
824 }
825
826 return rc;
827}
828
829/**
830 * netlbl_catmap_setlong - Import an unsigned long bitmap
831 * @catmap: pointer to the category bitmap
832 * @offset: offset to the start of the imported bitmap
833 * @bitmap: the bitmap to import
834 * @flags: memory allocation flags
835 *
836 * Description:
837 * Import the bitmap specified in @bitmap into @catmap, using the offset
838 * in @offset. The offset must be aligned to an unsigned long. Returns zero
839 * on success, negative values on failure.
840 *
841 */
842int netlbl_catmap_setlong(struct netlbl_lsm_catmap **catmap,
843 u32 offset,
844 unsigned long bitmap,
845 gfp_t flags)
846{
847 struct netlbl_lsm_catmap *iter;
848 u32 idx;
849
850 /* only allow aligned offsets */
851 if ((offset & (BITS_PER_LONG - 1)) != 0)
852 return -EINVAL;
853
854 iter = _netlbl_catmap_getnode(catmap, offset, _CM_F_ALLOC, flags);
855 if (iter == NULL)
856 return -ENOMEM;
857
858 offset -= iter->startbit;
859 idx = offset / NETLBL_CATMAP_MAPSIZE;
860 iter->bitmap[idx] |= (u64)bitmap
861 << (offset % NETLBL_CATMAP_MAPSIZE);
862
863 return 0;
864}
865
866/* Bitmap functions
867 */
868
869/**
870 * netlbl_bitmap_walk - Walk a bitmap looking for a bit
871 * @bitmap: the bitmap
872 * @bitmap_len: length in bits
873 * @offset: starting offset
874 * @state: if non-zero, look for a set (1) bit else look for a cleared (0) bit
875 *
876 * Description:
877 * Starting at @offset, walk the bitmap from left to right until either the
878 * desired bit is found or we reach the end. Return the bit offset, -1 if
879 * not found.
880 */
881int netlbl_bitmap_walk(const unsigned char *bitmap, u32 bitmap_len,
882 u32 offset, u8 state)
883{
884 u32 bit_spot;
885 u32 byte_offset;
886 unsigned char bitmask;
887 unsigned char byte;
888
889 if (offset >= bitmap_len)
890 return -1;
891 byte_offset = offset / 8;
892 byte = bitmap[byte_offset];
893 bit_spot = offset;
894 bitmask = 0x80 >> (offset % 8);
895
896 while (bit_spot < bitmap_len) {
897 if ((state && (byte & bitmask) == bitmask) ||
898 (state == 0 && (byte & bitmask) == 0))
899 return bit_spot;
900
901 if (++bit_spot >= bitmap_len)
902 return -1;
903 bitmask >>= 1;
904 if (bitmask == 0) {
905 byte = bitmap[++byte_offset];
906 bitmask = 0x80;
907 }
908 }
909
910 return -1;
911}
912EXPORT_SYMBOL(netlbl_bitmap_walk);
913
914/**
915 * netlbl_bitmap_setbit - Sets a single bit in a bitmap
916 * @bitmap: the bitmap
917 * @bit: the bit
918 * @state: if non-zero, set the bit (1) else clear the bit (0)
919 *
920 * Description:
921 * Set a single bit in the bitmask. Returns zero on success, negative values
922 * on error.
923 */
924void netlbl_bitmap_setbit(unsigned char *bitmap, u32 bit, u8 state)
925{
926 u32 byte_spot;
927 u8 bitmask;
928
929 /* gcc always rounds to zero when doing integer division */
930 byte_spot = bit / 8;
931 bitmask = 0x80 >> (bit % 8);
932 if (state)
933 bitmap[byte_spot] |= bitmask;
934 else
935 bitmap[byte_spot] &= ~bitmask;
936}
937EXPORT_SYMBOL(netlbl_bitmap_setbit);
938
939/*
940 * LSM Functions
941 */
942
943/**
944 * netlbl_enabled - Determine if the NetLabel subsystem is enabled
945 *
946 * Description:
947 * The LSM can use this function to determine if it should use NetLabel
948 * security attributes in it's enforcement mechanism. Currently, NetLabel is
949 * considered to be enabled when it's configuration contains a valid setup for
950 * at least one labeled protocol (i.e. NetLabel can understand incoming
951 * labeled packets of at least one type); otherwise NetLabel is considered to
952 * be disabled.
953 *
954 */
955int netlbl_enabled(void)
956{
957 /* At some point we probably want to expose this mechanism to the user
958 * as well so that admins can toggle NetLabel regardless of the
959 * configuration */
960 return (atomic_read(&netlabel_mgmt_protocount) > 0);
961}
962
963/**
964 * netlbl_sock_setattr - Label a socket using the correct protocol
965 * @sk: the socket to label
966 * @family: protocol family
967 * @secattr: the security attributes
968 * @sk_locked: true if caller holds the socket lock
969 *
970 * Description:
971 * Attach the correct label to the given socket using the security attributes
972 * specified in @secattr. This function requires exclusive access to @sk,
973 * which means it either needs to be in the process of being created or locked.
974 * Returns zero on success, -EDESTADDRREQ if the domain is configured to use
975 * network address selectors (can't blindly label the socket), and negative
976 * values on all other failures.
977 *
978 */
979int netlbl_sock_setattr(struct sock *sk,
980 u16 family,
981 const struct netlbl_lsm_secattr *secattr,
982 bool sk_locked)
983{
984 int ret_val;
985 struct netlbl_dom_map *dom_entry;
986
987 rcu_read_lock();
988 dom_entry = netlbl_domhsh_getentry(secattr->domain, family);
989 if (dom_entry == NULL) {
990 ret_val = -ENOENT;
991 goto socket_setattr_return;
992 }
993 switch (family) {
994 case AF_INET:
995 switch (dom_entry->def.type) {
996 case NETLBL_NLTYPE_ADDRSELECT:
997 ret_val = -EDESTADDRREQ;
998 break;
999 case NETLBL_NLTYPE_CIPSOV4:
1000 ret_val = cipso_v4_sock_setattr(sk,
1001 dom_entry->def.cipso,
1002 secattr, sk_locked);
1003 break;
1004 case NETLBL_NLTYPE_UNLABELED:
1005 ret_val = 0;
1006 break;
1007 default:
1008 ret_val = -ENOENT;
1009 }
1010 break;
1011#if IS_ENABLED(CONFIG_IPV6)
1012 case AF_INET6:
1013 switch (dom_entry->def.type) {
1014 case NETLBL_NLTYPE_ADDRSELECT:
1015 ret_val = -EDESTADDRREQ;
1016 break;
1017 case NETLBL_NLTYPE_CALIPSO:
1018 ret_val = calipso_sock_setattr(sk,
1019 dom_entry->def.calipso,
1020 secattr);
1021 break;
1022 case NETLBL_NLTYPE_UNLABELED:
1023 ret_val = 0;
1024 break;
1025 default:
1026 ret_val = -ENOENT;
1027 }
1028 break;
1029#endif /* IPv6 */
1030 default:
1031 ret_val = -EPROTONOSUPPORT;
1032 }
1033
1034socket_setattr_return:
1035 rcu_read_unlock();
1036 return ret_val;
1037}
1038
1039/**
1040 * netlbl_sock_delattr - Delete all the NetLabel labels on a socket
1041 * @sk: the socket
1042 *
1043 * Description:
1044 * Remove all the NetLabel labeling from @sk. The caller is responsible for
1045 * ensuring that @sk is locked.
1046 *
1047 */
1048void netlbl_sock_delattr(struct sock *sk)
1049{
1050 switch (sk->sk_family) {
1051 case AF_INET:
1052 cipso_v4_sock_delattr(sk);
1053 break;
1054#if IS_ENABLED(CONFIG_IPV6)
1055 case AF_INET6:
1056 calipso_sock_delattr(sk);
1057 break;
1058#endif /* IPv6 */
1059 }
1060}
1061
1062/**
1063 * netlbl_sock_getattr - Determine the security attributes of a sock
1064 * @sk: the sock
1065 * @secattr: the security attributes
1066 *
1067 * Description:
1068 * Examines the given sock to see if any NetLabel style labeling has been
1069 * applied to the sock, if so it parses the socket label and returns the
1070 * security attributes in @secattr. Returns zero on success, negative values
1071 * on failure.
1072 *
1073 */
1074int netlbl_sock_getattr(struct sock *sk,
1075 struct netlbl_lsm_secattr *secattr)
1076{
1077 int ret_val;
1078
1079 switch (sk->sk_family) {
1080 case AF_INET:
1081 ret_val = cipso_v4_sock_getattr(sk, secattr);
1082 break;
1083#if IS_ENABLED(CONFIG_IPV6)
1084 case AF_INET6:
1085 ret_val = calipso_sock_getattr(sk, secattr);
1086 break;
1087#endif /* IPv6 */
1088 default:
1089 ret_val = -EPROTONOSUPPORT;
1090 }
1091
1092 return ret_val;
1093}
1094
1095/**
1096 * netlbl_sk_lock_check - Check if the socket lock has been acquired.
1097 * @sk: the socket to be checked
1098 *
1099 * Return: true if socket @sk is locked or if lock debugging is disabled at
1100 * runtime or compile-time; false otherwise
1101 *
1102 */
1103#ifdef CONFIG_LOCKDEP
1104bool netlbl_sk_lock_check(struct sock *sk)
1105{
1106 if (debug_locks)
1107 return lockdep_sock_is_held(sk);
1108 return true;
1109}
1110#else
1111bool netlbl_sk_lock_check(struct sock *sk)
1112{
1113 return true;
1114}
1115#endif
1116
1117/**
1118 * netlbl_conn_setattr - Label a connected socket using the correct protocol
1119 * @sk: the socket to label
1120 * @addr: the destination address
1121 * @secattr: the security attributes
1122 *
1123 * Description:
1124 * Attach the correct label to the given connected socket using the security
1125 * attributes specified in @secattr. The caller is responsible for ensuring
1126 * that @sk is locked. Returns zero on success, negative values on failure.
1127 *
1128 */
1129int netlbl_conn_setattr(struct sock *sk,
1130 struct sockaddr *addr,
1131 const struct netlbl_lsm_secattr *secattr)
1132{
1133 int ret_val;
1134 struct sockaddr_in *addr4;
1135#if IS_ENABLED(CONFIG_IPV6)
1136 struct sockaddr_in6 *addr6;
1137#endif
1138 struct netlbl_dommap_def *entry;
1139
1140 rcu_read_lock();
1141 switch (addr->sa_family) {
1142 case AF_INET:
1143 addr4 = (struct sockaddr_in *)addr;
1144 entry = netlbl_domhsh_getentry_af4(secattr->domain,
1145 addr4->sin_addr.s_addr);
1146 if (entry == NULL) {
1147 ret_val = -ENOENT;
1148 goto conn_setattr_return;
1149 }
1150 switch (entry->type) {
1151 case NETLBL_NLTYPE_CIPSOV4:
1152 ret_val = cipso_v4_sock_setattr(sk,
1153 entry->cipso, secattr,
1154 netlbl_sk_lock_check(sk));
1155 break;
1156 case NETLBL_NLTYPE_UNLABELED:
1157 /* just delete the protocols we support for right now
1158 * but we could remove other protocols if needed */
1159 netlbl_sock_delattr(sk);
1160 ret_val = 0;
1161 break;
1162 default:
1163 ret_val = -ENOENT;
1164 }
1165 break;
1166#if IS_ENABLED(CONFIG_IPV6)
1167 case AF_INET6:
1168 addr6 = (struct sockaddr_in6 *)addr;
1169 entry = netlbl_domhsh_getentry_af6(secattr->domain,
1170 &addr6->sin6_addr);
1171 if (entry == NULL) {
1172 ret_val = -ENOENT;
1173 goto conn_setattr_return;
1174 }
1175 switch (entry->type) {
1176 case NETLBL_NLTYPE_CALIPSO:
1177 ret_val = calipso_sock_setattr(sk,
1178 entry->calipso, secattr);
1179 break;
1180 case NETLBL_NLTYPE_UNLABELED:
1181 /* just delete the protocols we support for right now
1182 * but we could remove other protocols if needed */
1183 netlbl_sock_delattr(sk);
1184 ret_val = 0;
1185 break;
1186 default:
1187 ret_val = -ENOENT;
1188 }
1189 break;
1190#endif /* IPv6 */
1191 default:
1192 ret_val = -EPROTONOSUPPORT;
1193 }
1194
1195conn_setattr_return:
1196 rcu_read_unlock();
1197 return ret_val;
1198}
1199
1200/**
1201 * netlbl_req_setattr - Label a request socket using the correct protocol
1202 * @req: the request socket to label
1203 * @secattr: the security attributes
1204 *
1205 * Description:
1206 * Attach the correct label to the given socket using the security attributes
1207 * specified in @secattr. Returns zero on success, negative values on failure.
1208 *
1209 */
1210int netlbl_req_setattr(struct request_sock *req,
1211 const struct netlbl_lsm_secattr *secattr)
1212{
1213 int ret_val;
1214 struct netlbl_dommap_def *entry;
1215 struct inet_request_sock *ireq = inet_rsk(req);
1216
1217 rcu_read_lock();
1218 switch (req->rsk_ops->family) {
1219 case AF_INET:
1220 entry = netlbl_domhsh_getentry_af4(secattr->domain,
1221 ireq->ir_rmt_addr);
1222 if (entry == NULL) {
1223 ret_val = -ENOENT;
1224 goto req_setattr_return;
1225 }
1226 switch (entry->type) {
1227 case NETLBL_NLTYPE_CIPSOV4:
1228 ret_val = cipso_v4_req_setattr(req,
1229 entry->cipso, 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#if IS_ENABLED(CONFIG_IPV6)
1240 case AF_INET6:
1241 entry = netlbl_domhsh_getentry_af6(secattr->domain,
1242 &ireq->ir_v6_rmt_addr);
1243 if (entry == NULL) {
1244 ret_val = -ENOENT;
1245 goto req_setattr_return;
1246 }
1247 switch (entry->type) {
1248 case NETLBL_NLTYPE_CALIPSO:
1249 ret_val = calipso_req_setattr(req,
1250 entry->calipso, secattr);
1251 break;
1252 case NETLBL_NLTYPE_UNLABELED:
1253 netlbl_req_delattr(req);
1254 ret_val = 0;
1255 break;
1256 default:
1257 ret_val = -ENOENT;
1258 }
1259 break;
1260#endif /* IPv6 */
1261 default:
1262 ret_val = -EPROTONOSUPPORT;
1263 }
1264
1265req_setattr_return:
1266 rcu_read_unlock();
1267 return ret_val;
1268}
1269
1270/**
1271* netlbl_req_delattr - Delete all the NetLabel labels on a socket
1272* @req: the socket
1273*
1274* Description:
1275* Remove all the NetLabel labeling from @req.
1276*
1277*/
1278void netlbl_req_delattr(struct request_sock *req)
1279{
1280 switch (req->rsk_ops->family) {
1281 case AF_INET:
1282 cipso_v4_req_delattr(req);
1283 break;
1284#if IS_ENABLED(CONFIG_IPV6)
1285 case AF_INET6:
1286 calipso_req_delattr(req);
1287 break;
1288#endif /* IPv6 */
1289 }
1290}
1291
1292/**
1293 * netlbl_skbuff_setattr - Label a packet using the correct protocol
1294 * @skb: the packet
1295 * @family: protocol family
1296 * @secattr: the security attributes
1297 *
1298 * Description:
1299 * Attach the correct label to the given packet using the security attributes
1300 * specified in @secattr. Returns zero on success, negative values on failure.
1301 *
1302 */
1303int netlbl_skbuff_setattr(struct sk_buff *skb,
1304 u16 family,
1305 const struct netlbl_lsm_secattr *secattr)
1306{
1307 int ret_val;
1308 struct iphdr *hdr4;
1309#if IS_ENABLED(CONFIG_IPV6)
1310 struct ipv6hdr *hdr6;
1311#endif
1312 struct netlbl_dommap_def *entry;
1313
1314 rcu_read_lock();
1315 switch (family) {
1316 case AF_INET:
1317 hdr4 = ip_hdr(skb);
1318 entry = netlbl_domhsh_getentry_af4(secattr->domain,
1319 hdr4->daddr);
1320 if (entry == NULL) {
1321 ret_val = -ENOENT;
1322 goto skbuff_setattr_return;
1323 }
1324 switch (entry->type) {
1325 case NETLBL_NLTYPE_CIPSOV4:
1326 ret_val = cipso_v4_skbuff_setattr(skb, entry->cipso,
1327 secattr);
1328 break;
1329 case NETLBL_NLTYPE_UNLABELED:
1330 /* just delete the protocols we support for right now
1331 * but we could remove other protocols if needed */
1332 ret_val = cipso_v4_skbuff_delattr(skb);
1333 break;
1334 default:
1335 ret_val = -ENOENT;
1336 }
1337 break;
1338#if IS_ENABLED(CONFIG_IPV6)
1339 case AF_INET6:
1340 hdr6 = ipv6_hdr(skb);
1341 entry = netlbl_domhsh_getentry_af6(secattr->domain,
1342 &hdr6->daddr);
1343 if (entry == NULL) {
1344 ret_val = -ENOENT;
1345 goto skbuff_setattr_return;
1346 }
1347 switch (entry->type) {
1348 case NETLBL_NLTYPE_CALIPSO:
1349 ret_val = calipso_skbuff_setattr(skb, entry->calipso,
1350 secattr);
1351 break;
1352 case NETLBL_NLTYPE_UNLABELED:
1353 /* just delete the protocols we support for right now
1354 * but we could remove other protocols if needed */
1355 ret_val = calipso_skbuff_delattr(skb);
1356 break;
1357 default:
1358 ret_val = -ENOENT;
1359 }
1360 break;
1361#endif /* IPv6 */
1362 default:
1363 ret_val = -EPROTONOSUPPORT;
1364 }
1365
1366skbuff_setattr_return:
1367 rcu_read_unlock();
1368 return ret_val;
1369}
1370
1371/**
1372 * netlbl_skbuff_getattr - Determine the security attributes of a packet
1373 * @skb: the packet
1374 * @family: protocol family
1375 * @secattr: the security attributes
1376 *
1377 * Description:
1378 * Examines the given packet to see if a recognized form of packet labeling
1379 * is present, if so it parses the packet label and returns the security
1380 * attributes in @secattr. Returns zero on success, negative values on
1381 * failure.
1382 *
1383 */
1384int netlbl_skbuff_getattr(const struct sk_buff *skb,
1385 u16 family,
1386 struct netlbl_lsm_secattr *secattr)
1387{
1388 unsigned char *ptr;
1389
1390 switch (family) {
1391 case AF_INET:
1392 ptr = cipso_v4_optptr(skb);
1393 if (ptr && cipso_v4_getattr(ptr, secattr) == 0)
1394 return 0;
1395 break;
1396#if IS_ENABLED(CONFIG_IPV6)
1397 case AF_INET6:
1398 ptr = calipso_optptr(skb);
1399 if (ptr && calipso_getattr(ptr, secattr) == 0)
1400 return 0;
1401 break;
1402#endif /* IPv6 */
1403 }
1404
1405 return netlbl_unlabel_getattr(skb, family, secattr);
1406}
1407
1408/**
1409 * netlbl_skbuff_err - Handle a LSM error on a sk_buff
1410 * @skb: the packet
1411 * @family: the family
1412 * @error: the error code
1413 * @gateway: true if host is acting as a gateway, false otherwise
1414 *
1415 * Description:
1416 * Deal with a LSM problem when handling the packet in @skb, typically this is
1417 * a permission denied problem (-EACCES). The correct action is determined
1418 * according to the packet's labeling protocol.
1419 *
1420 */
1421void netlbl_skbuff_err(struct sk_buff *skb, u16 family, int error, int gateway)
1422{
1423 switch (family) {
1424 case AF_INET:
1425 if (cipso_v4_optptr(skb))
1426 cipso_v4_error(skb, error, gateway);
1427 break;
1428 }
1429}
1430
1431/**
1432 * netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches
1433 *
1434 * Description:
1435 * For all of the NetLabel protocols that support some form of label mapping
1436 * cache, invalidate the cache. Returns zero on success, negative values on
1437 * error.
1438 *
1439 */
1440void netlbl_cache_invalidate(void)
1441{
1442 cipso_v4_cache_invalidate();
1443#if IS_ENABLED(CONFIG_IPV6)
1444 calipso_cache_invalidate();
1445#endif /* IPv6 */
1446}
1447
1448/**
1449 * netlbl_cache_add - Add an entry to a NetLabel protocol cache
1450 * @skb: the packet
1451 * @family: the family
1452 * @secattr: the packet's security attributes
1453 *
1454 * Description:
1455 * Add the LSM security attributes for the given packet to the underlying
1456 * NetLabel protocol's label mapping cache. Returns zero on success, negative
1457 * values on error.
1458 *
1459 */
1460int netlbl_cache_add(const struct sk_buff *skb, u16 family,
1461 const struct netlbl_lsm_secattr *secattr)
1462{
1463 unsigned char *ptr;
1464
1465 if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0)
1466 return -ENOMSG;
1467
1468 switch (family) {
1469 case AF_INET:
1470 ptr = cipso_v4_optptr(skb);
1471 if (ptr)
1472 return cipso_v4_cache_add(ptr, secattr);
1473 break;
1474#if IS_ENABLED(CONFIG_IPV6)
1475 case AF_INET6:
1476 ptr = calipso_optptr(skb);
1477 if (ptr)
1478 return calipso_cache_add(ptr, secattr);
1479 break;
1480#endif /* IPv6 */
1481 }
1482 return -ENOMSG;
1483}
1484
1485/*
1486 * Protocol Engine Functions
1487 */
1488
1489/**
1490 * netlbl_audit_start - Start an audit message
1491 * @type: audit message type
1492 * @audit_info: NetLabel audit information
1493 *
1494 * Description:
1495 * Start an audit message using the type specified in @type and fill the audit
1496 * message with some fields common to all NetLabel audit messages. This
1497 * function should only be used by protocol engines, not LSMs. Returns a
1498 * pointer to the audit buffer on success, NULL on failure.
1499 *
1500 */
1501struct audit_buffer *netlbl_audit_start(int type,
1502 struct netlbl_audit *audit_info)
1503{
1504 return netlbl_audit_start_common(type, audit_info);
1505}
1506EXPORT_SYMBOL(netlbl_audit_start);
1507
1508/*
1509 * Setup Functions
1510 */
1511
1512/**
1513 * netlbl_init - Initialize NetLabel
1514 *
1515 * Description:
1516 * Perform the required NetLabel initialization before first use.
1517 *
1518 */
1519static int __init netlbl_init(void)
1520{
1521 int ret_val;
1522
1523 printk(KERN_INFO "NetLabel: Initializing\n");
1524 printk(KERN_INFO "NetLabel: domain hash size = %u\n",
1525 (1 << NETLBL_DOMHSH_BITSIZE));
1526 printk(KERN_INFO "NetLabel: protocols = UNLABELED CIPSOv4 CALIPSO\n");
1527
1528 ret_val = netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE);
1529 if (ret_val != 0)
1530 goto init_failure;
1531
1532 ret_val = netlbl_unlabel_init(NETLBL_UNLHSH_BITSIZE);
1533 if (ret_val != 0)
1534 goto init_failure;
1535
1536 ret_val = netlbl_netlink_init();
1537 if (ret_val != 0)
1538 goto init_failure;
1539
1540 ret_val = netlbl_unlabel_defconf();
1541 if (ret_val != 0)
1542 goto init_failure;
1543 printk(KERN_INFO "NetLabel: unlabeled traffic allowed by default\n");
1544
1545 return 0;
1546
1547init_failure:
1548 panic("NetLabel: failed to initialize properly (%d)\n", ret_val);
1549}
1550
1551subsys_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 <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);