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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, write to the Free Software
27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
28 *
29 */
30
31#include <linux/init.h>
32#include <linux/types.h>
33#include <linux/slab.h>
34#include <linux/audit.h>
35#include <linux/in.h>
36#include <linux/in6.h>
37#include <net/ip.h>
38#include <net/ipv6.h>
39#include <net/netlabel.h>
40#include <net/cipso_ipv4.h>
41#include <asm/bug.h>
42#include <linux/atomic.h>
43
44#include "netlabel_domainhash.h"
45#include "netlabel_unlabeled.h"
46#include "netlabel_cipso_v4.h"
47#include "netlabel_user.h"
48#include "netlabel_mgmt.h"
49#include "netlabel_addrlist.h"
50
51/*
52 * Configuration Functions
53 */
54
55/**
56 * netlbl_cfg_map_del - Remove a NetLabel/LSM domain mapping
57 * @domain: the domain mapping to remove
58 * @family: address family
59 * @addr: IP address
60 * @mask: IP address mask
61 * @audit_info: NetLabel audit information
62 *
63 * Description:
64 * Removes a NetLabel/LSM domain mapping. A @domain value of NULL causes the
65 * default domain mapping to be removed. Returns zero on success, negative
66 * values on failure.
67 *
68 */
69int netlbl_cfg_map_del(const char *domain,
70 u16 family,
71 const void *addr,
72 const void *mask,
73 struct netlbl_audit *audit_info)
74{
75 if (addr == NULL && mask == NULL) {
76 return netlbl_domhsh_remove(domain, audit_info);
77 } else if (addr != NULL && mask != NULL) {
78 switch (family) {
79 case AF_INET:
80 return netlbl_domhsh_remove_af4(domain, addr, mask,
81 audit_info);
82 default:
83 return -EPFNOSUPPORT;
84 }
85 } else
86 return -EINVAL;
87}
88
89/**
90 * netlbl_cfg_unlbl_map_add - Add a new unlabeled mapping
91 * @domain: the domain mapping to add
92 * @family: address family
93 * @addr: IP address
94 * @mask: IP address mask
95 * @audit_info: NetLabel audit information
96 *
97 * Description:
98 * Adds a new unlabeled NetLabel/LSM domain mapping. A @domain value of NULL
99 * causes a new default domain mapping to be added. Returns zero on success,
100 * negative values on failure.
101 *
102 */
103int netlbl_cfg_unlbl_map_add(const char *domain,
104 u16 family,
105 const void *addr,
106 const void *mask,
107 struct netlbl_audit *audit_info)
108{
109 int ret_val = -ENOMEM;
110 struct netlbl_dom_map *entry;
111 struct netlbl_domaddr_map *addrmap = NULL;
112 struct netlbl_domaddr4_map *map4 = NULL;
113 struct netlbl_domaddr6_map *map6 = NULL;
114
115 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
116 if (entry == NULL)
117 return -ENOMEM;
118 if (domain != NULL) {
119 entry->domain = kstrdup(domain, GFP_ATOMIC);
120 if (entry->domain == NULL)
121 goto cfg_unlbl_map_add_failure;
122 }
123
124 if (addr == NULL && mask == NULL)
125 entry->type = NETLBL_NLTYPE_UNLABELED;
126 else if (addr != NULL && mask != NULL) {
127 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
128 if (addrmap == NULL)
129 goto cfg_unlbl_map_add_failure;
130 INIT_LIST_HEAD(&addrmap->list4);
131 INIT_LIST_HEAD(&addrmap->list6);
132
133 switch (family) {
134 case AF_INET: {
135 const struct in_addr *addr4 = addr;
136 const struct in_addr *mask4 = mask;
137 map4 = kzalloc(sizeof(*map4), GFP_ATOMIC);
138 if (map4 == NULL)
139 goto cfg_unlbl_map_add_failure;
140 map4->type = NETLBL_NLTYPE_UNLABELED;
141 map4->list.addr = addr4->s_addr & mask4->s_addr;
142 map4->list.mask = mask4->s_addr;
143 map4->list.valid = 1;
144 ret_val = netlbl_af4list_add(&map4->list,
145 &addrmap->list4);
146 if (ret_val != 0)
147 goto cfg_unlbl_map_add_failure;
148 break;
149 }
150#if IS_ENABLED(CONFIG_IPV6)
151 case AF_INET6: {
152 const struct in6_addr *addr6 = addr;
153 const struct in6_addr *mask6 = mask;
154 map6 = kzalloc(sizeof(*map6), GFP_ATOMIC);
155 if (map6 == NULL)
156 goto cfg_unlbl_map_add_failure;
157 map6->type = NETLBL_NLTYPE_UNLABELED;
158 map6->list.addr = *addr6;
159 map6->list.addr.s6_addr32[0] &= mask6->s6_addr32[0];
160 map6->list.addr.s6_addr32[1] &= mask6->s6_addr32[1];
161 map6->list.addr.s6_addr32[2] &= mask6->s6_addr32[2];
162 map6->list.addr.s6_addr32[3] &= mask6->s6_addr32[3];
163 map6->list.mask = *mask6;
164 map6->list.valid = 1;
165 ret_val = netlbl_af6list_add(&map6->list,
166 &addrmap->list6);
167 if (ret_val != 0)
168 goto cfg_unlbl_map_add_failure;
169 break;
170 }
171#endif /* IPv6 */
172 default:
173 goto cfg_unlbl_map_add_failure;
174 break;
175 }
176
177 entry->type_def.addrsel = addrmap;
178 entry->type = NETLBL_NLTYPE_ADDRSELECT;
179 } else {
180 ret_val = -EINVAL;
181 goto cfg_unlbl_map_add_failure;
182 }
183
184 ret_val = netlbl_domhsh_add(entry, audit_info);
185 if (ret_val != 0)
186 goto cfg_unlbl_map_add_failure;
187
188 return 0;
189
190cfg_unlbl_map_add_failure:
191 kfree(entry->domain);
192 kfree(entry);
193 kfree(addrmap);
194 kfree(map4);
195 kfree(map6);
196 return ret_val;
197}
198
199
200/**
201 * netlbl_cfg_unlbl_static_add - Adds a new static label
202 * @net: network namespace
203 * @dev_name: interface name
204 * @addr: IP address in network byte order (struct in[6]_addr)
205 * @mask: address mask in network byte order (struct in[6]_addr)
206 * @family: address family
207 * @secid: LSM secid value for the entry
208 * @audit_info: NetLabel audit information
209 *
210 * Description:
211 * Adds a new NetLabel static label to be used when protocol provided labels
212 * are not present on incoming traffic. If @dev_name is NULL then the default
213 * interface will be used. Returns zero on success, negative values on failure.
214 *
215 */
216int netlbl_cfg_unlbl_static_add(struct net *net,
217 const char *dev_name,
218 const void *addr,
219 const void *mask,
220 u16 family,
221 u32 secid,
222 struct netlbl_audit *audit_info)
223{
224 u32 addr_len;
225
226 switch (family) {
227 case AF_INET:
228 addr_len = sizeof(struct in_addr);
229 break;
230#if IS_ENABLED(CONFIG_IPV6)
231 case AF_INET6:
232 addr_len = sizeof(struct in6_addr);
233 break;
234#endif /* IPv6 */
235 default:
236 return -EPFNOSUPPORT;
237 }
238
239 return netlbl_unlhsh_add(net,
240 dev_name, addr, mask, addr_len,
241 secid, audit_info);
242}
243
244/**
245 * netlbl_cfg_unlbl_static_del - Removes an existing static label
246 * @net: network namespace
247 * @dev_name: interface name
248 * @addr: IP address in network byte order (struct in[6]_addr)
249 * @mask: address mask in network byte order (struct in[6]_addr)
250 * @family: address family
251 * @secid: LSM secid value for the entry
252 * @audit_info: NetLabel audit information
253 *
254 * Description:
255 * Removes an existing NetLabel static label used when protocol provided labels
256 * are not present on incoming traffic. If @dev_name is NULL then the default
257 * interface will be used. Returns zero on success, negative values on failure.
258 *
259 */
260int netlbl_cfg_unlbl_static_del(struct net *net,
261 const char *dev_name,
262 const void *addr,
263 const void *mask,
264 u16 family,
265 struct netlbl_audit *audit_info)
266{
267 u32 addr_len;
268
269 switch (family) {
270 case AF_INET:
271 addr_len = sizeof(struct in_addr);
272 break;
273#if IS_ENABLED(CONFIG_IPV6)
274 case AF_INET6:
275 addr_len = sizeof(struct in6_addr);
276 break;
277#endif /* IPv6 */
278 default:
279 return -EPFNOSUPPORT;
280 }
281
282 return netlbl_unlhsh_remove(net,
283 dev_name, addr, mask, addr_len,
284 audit_info);
285}
286
287/**
288 * netlbl_cfg_cipsov4_add - Add a new CIPSOv4 DOI definition
289 * @doi_def: CIPSO DOI definition
290 * @audit_info: NetLabel audit information
291 *
292 * Description:
293 * Add a new CIPSO DOI definition as defined by @doi_def. Returns zero on
294 * success and negative values on failure.
295 *
296 */
297int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def,
298 struct netlbl_audit *audit_info)
299{
300 return cipso_v4_doi_add(doi_def, audit_info);
301}
302
303/**
304 * netlbl_cfg_cipsov4_del - Remove an existing CIPSOv4 DOI definition
305 * @doi: CIPSO DOI
306 * @audit_info: NetLabel audit information
307 *
308 * Description:
309 * Remove an existing CIPSO DOI definition matching @doi. Returns zero on
310 * success and negative values on failure.
311 *
312 */
313void netlbl_cfg_cipsov4_del(u32 doi, struct netlbl_audit *audit_info)
314{
315 cipso_v4_doi_remove(doi, audit_info);
316}
317
318/**
319 * netlbl_cfg_cipsov4_map_add - Add a new CIPSOv4 DOI mapping
320 * @doi: the CIPSO DOI
321 * @domain: the domain mapping to add
322 * @addr: IP address
323 * @mask: IP address mask
324 * @audit_info: NetLabel audit information
325 *
326 * Description:
327 * Add a new NetLabel/LSM domain mapping for the given CIPSO DOI to the NetLabel
328 * subsystem. A @domain value of NULL adds a new default domain mapping.
329 * Returns zero on success, negative values on failure.
330 *
331 */
332int netlbl_cfg_cipsov4_map_add(u32 doi,
333 const char *domain,
334 const struct in_addr *addr,
335 const struct in_addr *mask,
336 struct netlbl_audit *audit_info)
337{
338 int ret_val = -ENOMEM;
339 struct cipso_v4_doi *doi_def;
340 struct netlbl_dom_map *entry;
341 struct netlbl_domaddr_map *addrmap = NULL;
342 struct netlbl_domaddr4_map *addrinfo = NULL;
343
344 doi_def = cipso_v4_doi_getdef(doi);
345 if (doi_def == NULL)
346 return -ENOENT;
347
348 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
349 if (entry == NULL)
350 goto out_entry;
351 if (domain != NULL) {
352 entry->domain = kstrdup(domain, GFP_ATOMIC);
353 if (entry->domain == NULL)
354 goto out_domain;
355 }
356
357 if (addr == NULL && mask == NULL) {
358 entry->type_def.cipsov4 = doi_def;
359 entry->type = NETLBL_NLTYPE_CIPSOV4;
360 } else if (addr != NULL && mask != NULL) {
361 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
362 if (addrmap == NULL)
363 goto out_addrmap;
364 INIT_LIST_HEAD(&addrmap->list4);
365 INIT_LIST_HEAD(&addrmap->list6);
366
367 addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC);
368 if (addrinfo == NULL)
369 goto out_addrinfo;
370 addrinfo->type_def.cipsov4 = doi_def;
371 addrinfo->type = NETLBL_NLTYPE_CIPSOV4;
372 addrinfo->list.addr = addr->s_addr & mask->s_addr;
373 addrinfo->list.mask = mask->s_addr;
374 addrinfo->list.valid = 1;
375 ret_val = netlbl_af4list_add(&addrinfo->list, &addrmap->list4);
376 if (ret_val != 0)
377 goto cfg_cipsov4_map_add_failure;
378
379 entry->type_def.addrsel = addrmap;
380 entry->type = NETLBL_NLTYPE_ADDRSELECT;
381 } else {
382 ret_val = -EINVAL;
383 goto out_addrmap;
384 }
385
386 ret_val = netlbl_domhsh_add(entry, audit_info);
387 if (ret_val != 0)
388 goto cfg_cipsov4_map_add_failure;
389
390 return 0;
391
392cfg_cipsov4_map_add_failure:
393 kfree(addrinfo);
394out_addrinfo:
395 kfree(addrmap);
396out_addrmap:
397 kfree(entry->domain);
398out_domain:
399 kfree(entry);
400out_entry:
401 cipso_v4_doi_putdef(doi_def);
402 return ret_val;
403}
404
405/*
406 * Security Attribute Functions
407 */
408
409/**
410 * netlbl_secattr_catmap_walk - Walk a LSM secattr catmap looking for a bit
411 * @catmap: the category bitmap
412 * @offset: the offset to start searching at, in bits
413 *
414 * Description:
415 * This function walks a LSM secattr category bitmap starting at @offset and
416 * returns the spot of the first set bit or -ENOENT if no bits are set.
417 *
418 */
419int netlbl_secattr_catmap_walk(struct netlbl_lsm_secattr_catmap *catmap,
420 u32 offset)
421{
422 struct netlbl_lsm_secattr_catmap *iter = catmap;
423 u32 node_idx;
424 u32 node_bit;
425 NETLBL_CATMAP_MAPTYPE bitmap;
426
427 if (offset > iter->startbit) {
428 while (offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
429 iter = iter->next;
430 if (iter == NULL)
431 return -ENOENT;
432 }
433 node_idx = (offset - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
434 node_bit = offset - iter->startbit -
435 (NETLBL_CATMAP_MAPSIZE * node_idx);
436 } else {
437 node_idx = 0;
438 node_bit = 0;
439 }
440 bitmap = iter->bitmap[node_idx] >> node_bit;
441
442 for (;;) {
443 if (bitmap != 0) {
444 while ((bitmap & NETLBL_CATMAP_BIT) == 0) {
445 bitmap >>= 1;
446 node_bit++;
447 }
448 return iter->startbit +
449 (NETLBL_CATMAP_MAPSIZE * node_idx) + node_bit;
450 }
451 if (++node_idx >= NETLBL_CATMAP_MAPCNT) {
452 if (iter->next != NULL) {
453 iter = iter->next;
454 node_idx = 0;
455 } else
456 return -ENOENT;
457 }
458 bitmap = iter->bitmap[node_idx];
459 node_bit = 0;
460 }
461
462 return -ENOENT;
463}
464
465/**
466 * netlbl_secattr_catmap_walk_rng - Find the end of a string of set bits
467 * @catmap: the category bitmap
468 * @offset: the offset to start searching at, in bits
469 *
470 * Description:
471 * This function walks a LSM secattr category bitmap starting at @offset and
472 * returns the spot of the first cleared bit or -ENOENT if the offset is past
473 * the end of the bitmap.
474 *
475 */
476int netlbl_secattr_catmap_walk_rng(struct netlbl_lsm_secattr_catmap *catmap,
477 u32 offset)
478{
479 struct netlbl_lsm_secattr_catmap *iter = catmap;
480 u32 node_idx;
481 u32 node_bit;
482 NETLBL_CATMAP_MAPTYPE bitmask;
483 NETLBL_CATMAP_MAPTYPE bitmap;
484
485 if (offset > iter->startbit) {
486 while (offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
487 iter = iter->next;
488 if (iter == NULL)
489 return -ENOENT;
490 }
491 node_idx = (offset - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
492 node_bit = offset - iter->startbit -
493 (NETLBL_CATMAP_MAPSIZE * node_idx);
494 } else {
495 node_idx = 0;
496 node_bit = 0;
497 }
498 bitmask = NETLBL_CATMAP_BIT << node_bit;
499
500 for (;;) {
501 bitmap = iter->bitmap[node_idx];
502 while (bitmask != 0 && (bitmap & bitmask) != 0) {
503 bitmask <<= 1;
504 node_bit++;
505 }
506
507 if (bitmask != 0)
508 return iter->startbit +
509 (NETLBL_CATMAP_MAPSIZE * node_idx) +
510 node_bit - 1;
511 else if (++node_idx >= NETLBL_CATMAP_MAPCNT) {
512 if (iter->next == NULL)
513 return iter->startbit + NETLBL_CATMAP_SIZE - 1;
514 iter = iter->next;
515 node_idx = 0;
516 }
517 bitmask = NETLBL_CATMAP_BIT;
518 node_bit = 0;
519 }
520
521 return -ENOENT;
522}
523
524/**
525 * netlbl_secattr_catmap_setbit - Set a bit in a LSM secattr catmap
526 * @catmap: the category bitmap
527 * @bit: the bit to set
528 * @flags: memory allocation flags
529 *
530 * Description:
531 * Set the bit specified by @bit in @catmap. Returns zero on success,
532 * negative values on failure.
533 *
534 */
535int netlbl_secattr_catmap_setbit(struct netlbl_lsm_secattr_catmap *catmap,
536 u32 bit,
537 gfp_t flags)
538{
539 struct netlbl_lsm_secattr_catmap *iter = catmap;
540 u32 node_bit;
541 u32 node_idx;
542
543 while (iter->next != NULL &&
544 bit >= (iter->startbit + NETLBL_CATMAP_SIZE))
545 iter = iter->next;
546 if (bit >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
547 iter->next = netlbl_secattr_catmap_alloc(flags);
548 if (iter->next == NULL)
549 return -ENOMEM;
550 iter = iter->next;
551 iter->startbit = bit & ~(NETLBL_CATMAP_SIZE - 1);
552 }
553
554 /* gcc always rounds to zero when doing integer division */
555 node_idx = (bit - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
556 node_bit = bit - iter->startbit - (NETLBL_CATMAP_MAPSIZE * node_idx);
557 iter->bitmap[node_idx] |= NETLBL_CATMAP_BIT << node_bit;
558
559 return 0;
560}
561
562/**
563 * netlbl_secattr_catmap_setrng - Set a range of bits in a LSM secattr catmap
564 * @catmap: the category bitmap
565 * @start: the starting bit
566 * @end: the last bit in the string
567 * @flags: memory allocation flags
568 *
569 * Description:
570 * Set a range of bits, starting at @start and ending with @end. Returns zero
571 * on success, negative values on failure.
572 *
573 */
574int netlbl_secattr_catmap_setrng(struct netlbl_lsm_secattr_catmap *catmap,
575 u32 start,
576 u32 end,
577 gfp_t flags)
578{
579 int ret_val = 0;
580 struct netlbl_lsm_secattr_catmap *iter = catmap;
581 u32 iter_max_spot;
582 u32 spot;
583
584 /* XXX - This could probably be made a bit faster by combining writes
585 * to the catmap instead of setting a single bit each time, but for
586 * right now skipping to the start of the range in the catmap should
587 * be a nice improvement over calling the individual setbit function
588 * repeatedly from a loop. */
589
590 while (iter->next != NULL &&
591 start >= (iter->startbit + NETLBL_CATMAP_SIZE))
592 iter = iter->next;
593 iter_max_spot = iter->startbit + NETLBL_CATMAP_SIZE;
594
595 for (spot = start; spot <= end && ret_val == 0; spot++) {
596 if (spot >= iter_max_spot && iter->next != NULL) {
597 iter = iter->next;
598 iter_max_spot = iter->startbit + NETLBL_CATMAP_SIZE;
599 }
600 ret_val = netlbl_secattr_catmap_setbit(iter, spot, flags);
601 }
602
603 return ret_val;
604}
605
606/*
607 * LSM Functions
608 */
609
610/**
611 * netlbl_enabled - Determine if the NetLabel subsystem is enabled
612 *
613 * Description:
614 * The LSM can use this function to determine if it should use NetLabel
615 * security attributes in it's enforcement mechanism. Currently, NetLabel is
616 * considered to be enabled when it's configuration contains a valid setup for
617 * at least one labeled protocol (i.e. NetLabel can understand incoming
618 * labeled packets of at least one type); otherwise NetLabel is considered to
619 * be disabled.
620 *
621 */
622int netlbl_enabled(void)
623{
624 /* At some point we probably want to expose this mechanism to the user
625 * as well so that admins can toggle NetLabel regardless of the
626 * configuration */
627 return (atomic_read(&netlabel_mgmt_protocount) > 0);
628}
629
630/**
631 * netlbl_sock_setattr - Label a socket using the correct protocol
632 * @sk: the socket to label
633 * @family: protocol family
634 * @secattr: the security attributes
635 *
636 * Description:
637 * Attach the correct label to the given socket using the security attributes
638 * specified in @secattr. This function requires exclusive access to @sk,
639 * which means it either needs to be in the process of being created or locked.
640 * Returns zero on success, -EDESTADDRREQ if the domain is configured to use
641 * network address selectors (can't blindly label the socket), and negative
642 * values on all other failures.
643 *
644 */
645int netlbl_sock_setattr(struct sock *sk,
646 u16 family,
647 const struct netlbl_lsm_secattr *secattr)
648{
649 int ret_val;
650 struct netlbl_dom_map *dom_entry;
651
652 rcu_read_lock();
653 dom_entry = netlbl_domhsh_getentry(secattr->domain);
654 if (dom_entry == NULL) {
655 ret_val = -ENOENT;
656 goto socket_setattr_return;
657 }
658 switch (family) {
659 case AF_INET:
660 switch (dom_entry->type) {
661 case NETLBL_NLTYPE_ADDRSELECT:
662 ret_val = -EDESTADDRREQ;
663 break;
664 case NETLBL_NLTYPE_CIPSOV4:
665 ret_val = cipso_v4_sock_setattr(sk,
666 dom_entry->type_def.cipsov4,
667 secattr);
668 break;
669 case NETLBL_NLTYPE_UNLABELED:
670 ret_val = 0;
671 break;
672 default:
673 ret_val = -ENOENT;
674 }
675 break;
676#if IS_ENABLED(CONFIG_IPV6)
677 case AF_INET6:
678 /* since we don't support any IPv6 labeling protocols right
679 * now we can optimize everything away until we do */
680 ret_val = 0;
681 break;
682#endif /* IPv6 */
683 default:
684 ret_val = -EPROTONOSUPPORT;
685 }
686
687socket_setattr_return:
688 rcu_read_unlock();
689 return ret_val;
690}
691
692/**
693 * netlbl_sock_delattr - Delete all the NetLabel labels on a socket
694 * @sk: the socket
695 *
696 * Description:
697 * Remove all the NetLabel labeling from @sk. The caller is responsible for
698 * ensuring that @sk is locked.
699 *
700 */
701void netlbl_sock_delattr(struct sock *sk)
702{
703 cipso_v4_sock_delattr(sk);
704}
705
706/**
707 * netlbl_sock_getattr - Determine the security attributes of a sock
708 * @sk: the sock
709 * @secattr: the security attributes
710 *
711 * Description:
712 * Examines the given sock to see if any NetLabel style labeling has been
713 * applied to the sock, if so it parses the socket label and returns the
714 * security attributes in @secattr. Returns zero on success, negative values
715 * on failure.
716 *
717 */
718int netlbl_sock_getattr(struct sock *sk,
719 struct netlbl_lsm_secattr *secattr)
720{
721 int ret_val;
722
723 switch (sk->sk_family) {
724 case AF_INET:
725 ret_val = cipso_v4_sock_getattr(sk, secattr);
726 break;
727#if IS_ENABLED(CONFIG_IPV6)
728 case AF_INET6:
729 ret_val = -ENOMSG;
730 break;
731#endif /* IPv6 */
732 default:
733 ret_val = -EPROTONOSUPPORT;
734 }
735
736 return ret_val;
737}
738
739/**
740 * netlbl_conn_setattr - Label a connected socket using the correct protocol
741 * @sk: the socket to label
742 * @addr: the destination address
743 * @secattr: the security attributes
744 *
745 * Description:
746 * Attach the correct label to the given connected socket using the security
747 * attributes specified in @secattr. The caller is responsible for ensuring
748 * that @sk is locked. Returns zero on success, negative values on failure.
749 *
750 */
751int netlbl_conn_setattr(struct sock *sk,
752 struct sockaddr *addr,
753 const struct netlbl_lsm_secattr *secattr)
754{
755 int ret_val;
756 struct sockaddr_in *addr4;
757 struct netlbl_domaddr4_map *af4_entry;
758
759 rcu_read_lock();
760 switch (addr->sa_family) {
761 case AF_INET:
762 addr4 = (struct sockaddr_in *)addr;
763 af4_entry = netlbl_domhsh_getentry_af4(secattr->domain,
764 addr4->sin_addr.s_addr);
765 if (af4_entry == NULL) {
766 ret_val = -ENOENT;
767 goto conn_setattr_return;
768 }
769 switch (af4_entry->type) {
770 case NETLBL_NLTYPE_CIPSOV4:
771 ret_val = cipso_v4_sock_setattr(sk,
772 af4_entry->type_def.cipsov4,
773 secattr);
774 break;
775 case NETLBL_NLTYPE_UNLABELED:
776 /* just delete the protocols we support for right now
777 * but we could remove other protocols if needed */
778 cipso_v4_sock_delattr(sk);
779 ret_val = 0;
780 break;
781 default:
782 ret_val = -ENOENT;
783 }
784 break;
785#if IS_ENABLED(CONFIG_IPV6)
786 case AF_INET6:
787 /* since we don't support any IPv6 labeling protocols right
788 * now we can optimize everything away until we do */
789 ret_val = 0;
790 break;
791#endif /* IPv6 */
792 default:
793 ret_val = -EPROTONOSUPPORT;
794 }
795
796conn_setattr_return:
797 rcu_read_unlock();
798 return ret_val;
799}
800
801/**
802 * netlbl_req_setattr - Label a request socket using the correct protocol
803 * @req: the request socket to label
804 * @secattr: the security attributes
805 *
806 * Description:
807 * Attach the correct label to the given socket using the security attributes
808 * specified in @secattr. Returns zero on success, negative values on failure.
809 *
810 */
811int netlbl_req_setattr(struct request_sock *req,
812 const struct netlbl_lsm_secattr *secattr)
813{
814 int ret_val;
815 struct netlbl_dom_map *dom_entry;
816 struct netlbl_domaddr4_map *af4_entry;
817 u32 proto_type;
818 struct cipso_v4_doi *proto_cv4;
819
820 rcu_read_lock();
821 dom_entry = netlbl_domhsh_getentry(secattr->domain);
822 if (dom_entry == NULL) {
823 ret_val = -ENOENT;
824 goto req_setattr_return;
825 }
826 switch (req->rsk_ops->family) {
827 case AF_INET:
828 if (dom_entry->type == NETLBL_NLTYPE_ADDRSELECT) {
829 struct inet_request_sock *req_inet = inet_rsk(req);
830 af4_entry = netlbl_domhsh_getentry_af4(secattr->domain,
831 req_inet->rmt_addr);
832 if (af4_entry == NULL) {
833 ret_val = -ENOENT;
834 goto req_setattr_return;
835 }
836 proto_type = af4_entry->type;
837 proto_cv4 = af4_entry->type_def.cipsov4;
838 } else {
839 proto_type = dom_entry->type;
840 proto_cv4 = dom_entry->type_def.cipsov4;
841 }
842 switch (proto_type) {
843 case NETLBL_NLTYPE_CIPSOV4:
844 ret_val = cipso_v4_req_setattr(req, proto_cv4, secattr);
845 break;
846 case NETLBL_NLTYPE_UNLABELED:
847 /* just delete the protocols we support for right now
848 * but we could remove other protocols if needed */
849 cipso_v4_req_delattr(req);
850 ret_val = 0;
851 break;
852 default:
853 ret_val = -ENOENT;
854 }
855 break;
856#if IS_ENABLED(CONFIG_IPV6)
857 case AF_INET6:
858 /* since we don't support any IPv6 labeling protocols right
859 * now we can optimize everything away until we do */
860 ret_val = 0;
861 break;
862#endif /* IPv6 */
863 default:
864 ret_val = -EPROTONOSUPPORT;
865 }
866
867req_setattr_return:
868 rcu_read_unlock();
869 return ret_val;
870}
871
872/**
873* netlbl_req_delattr - Delete all the NetLabel labels on a socket
874* @req: the socket
875*
876* Description:
877* Remove all the NetLabel labeling from @req.
878*
879*/
880void netlbl_req_delattr(struct request_sock *req)
881{
882 cipso_v4_req_delattr(req);
883}
884
885/**
886 * netlbl_skbuff_setattr - Label a packet using the correct protocol
887 * @skb: the packet
888 * @family: protocol family
889 * @secattr: the security attributes
890 *
891 * Description:
892 * Attach the correct label to the given packet using the security attributes
893 * specified in @secattr. Returns zero on success, negative values on failure.
894 *
895 */
896int netlbl_skbuff_setattr(struct sk_buff *skb,
897 u16 family,
898 const struct netlbl_lsm_secattr *secattr)
899{
900 int ret_val;
901 struct iphdr *hdr4;
902 struct netlbl_domaddr4_map *af4_entry;
903
904 rcu_read_lock();
905 switch (family) {
906 case AF_INET:
907 hdr4 = ip_hdr(skb);
908 af4_entry = netlbl_domhsh_getentry_af4(secattr->domain,
909 hdr4->daddr);
910 if (af4_entry == NULL) {
911 ret_val = -ENOENT;
912 goto skbuff_setattr_return;
913 }
914 switch (af4_entry->type) {
915 case NETLBL_NLTYPE_CIPSOV4:
916 ret_val = cipso_v4_skbuff_setattr(skb,
917 af4_entry->type_def.cipsov4,
918 secattr);
919 break;
920 case NETLBL_NLTYPE_UNLABELED:
921 /* just delete the protocols we support for right now
922 * but we could remove other protocols if needed */
923 ret_val = cipso_v4_skbuff_delattr(skb);
924 break;
925 default:
926 ret_val = -ENOENT;
927 }
928 break;
929#if IS_ENABLED(CONFIG_IPV6)
930 case AF_INET6:
931 /* since we don't support any IPv6 labeling protocols right
932 * now we can optimize everything away until we do */
933 ret_val = 0;
934 break;
935#endif /* IPv6 */
936 default:
937 ret_val = -EPROTONOSUPPORT;
938 }
939
940skbuff_setattr_return:
941 rcu_read_unlock();
942 return ret_val;
943}
944
945/**
946 * netlbl_skbuff_getattr - Determine the security attributes of a packet
947 * @skb: the packet
948 * @family: protocol family
949 * @secattr: the security attributes
950 *
951 * Description:
952 * Examines the given packet to see if a recognized form of packet labeling
953 * is present, if so it parses the packet label and returns the security
954 * attributes in @secattr. Returns zero on success, negative values on
955 * failure.
956 *
957 */
958int netlbl_skbuff_getattr(const struct sk_buff *skb,
959 u16 family,
960 struct netlbl_lsm_secattr *secattr)
961{
962 switch (family) {
963 case AF_INET:
964 if (CIPSO_V4_OPTEXIST(skb) &&
965 cipso_v4_skbuff_getattr(skb, secattr) == 0)
966 return 0;
967 break;
968#if IS_ENABLED(CONFIG_IPV6)
969 case AF_INET6:
970 break;
971#endif /* IPv6 */
972 }
973
974 return netlbl_unlabel_getattr(skb, family, secattr);
975}
976
977/**
978 * netlbl_skbuff_err - Handle a LSM error on a sk_buff
979 * @skb: the packet
980 * @error: the error code
981 * @gateway: true if host is acting as a gateway, false otherwise
982 *
983 * Description:
984 * Deal with a LSM problem when handling the packet in @skb, typically this is
985 * a permission denied problem (-EACCES). The correct action is determined
986 * according to the packet's labeling protocol.
987 *
988 */
989void netlbl_skbuff_err(struct sk_buff *skb, int error, int gateway)
990{
991 if (CIPSO_V4_OPTEXIST(skb))
992 cipso_v4_error(skb, error, gateway);
993}
994
995/**
996 * netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches
997 *
998 * Description:
999 * For all of the NetLabel protocols that support some form of label mapping
1000 * cache, invalidate the cache. Returns zero on success, negative values on
1001 * error.
1002 *
1003 */
1004void netlbl_cache_invalidate(void)
1005{
1006 cipso_v4_cache_invalidate();
1007}
1008
1009/**
1010 * netlbl_cache_add - Add an entry to a NetLabel protocol cache
1011 * @skb: the packet
1012 * @secattr: the packet's security attributes
1013 *
1014 * Description:
1015 * Add the LSM security attributes for the given packet to the underlying
1016 * NetLabel protocol's label mapping cache. Returns zero on success, negative
1017 * values on error.
1018 *
1019 */
1020int netlbl_cache_add(const struct sk_buff *skb,
1021 const struct netlbl_lsm_secattr *secattr)
1022{
1023 if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0)
1024 return -ENOMSG;
1025
1026 if (CIPSO_V4_OPTEXIST(skb))
1027 return cipso_v4_cache_add(skb, secattr);
1028
1029 return -ENOMSG;
1030}
1031
1032/*
1033 * Protocol Engine Functions
1034 */
1035
1036/**
1037 * netlbl_audit_start - Start an audit message
1038 * @type: audit message type
1039 * @audit_info: NetLabel audit information
1040 *
1041 * Description:
1042 * Start an audit message using the type specified in @type and fill the audit
1043 * message with some fields common to all NetLabel audit messages. This
1044 * function should only be used by protocol engines, not LSMs. Returns a
1045 * pointer to the audit buffer on success, NULL on failure.
1046 *
1047 */
1048struct audit_buffer *netlbl_audit_start(int type,
1049 struct netlbl_audit *audit_info)
1050{
1051 return netlbl_audit_start_common(type, audit_info);
1052}
1053
1054/*
1055 * Setup Functions
1056 */
1057
1058/**
1059 * netlbl_init - Initialize NetLabel
1060 *
1061 * Description:
1062 * Perform the required NetLabel initialization before first use.
1063 *
1064 */
1065static int __init netlbl_init(void)
1066{
1067 int ret_val;
1068
1069 printk(KERN_INFO "NetLabel: Initializing\n");
1070 printk(KERN_INFO "NetLabel: domain hash size = %u\n",
1071 (1 << NETLBL_DOMHSH_BITSIZE));
1072 printk(KERN_INFO "NetLabel: protocols ="
1073 " UNLABELED"
1074 " CIPSOv4"
1075 "\n");
1076
1077 ret_val = netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE);
1078 if (ret_val != 0)
1079 goto init_failure;
1080
1081 ret_val = netlbl_unlabel_init(NETLBL_UNLHSH_BITSIZE);
1082 if (ret_val != 0)
1083 goto init_failure;
1084
1085 ret_val = netlbl_netlink_init();
1086 if (ret_val != 0)
1087 goto init_failure;
1088
1089 ret_val = netlbl_unlabel_defconf();
1090 if (ret_val != 0)
1091 goto init_failure;
1092 printk(KERN_INFO "NetLabel: unlabeled traffic allowed by default\n");
1093
1094 return 0;
1095
1096init_failure:
1097 panic("NetLabel: failed to initialize properly (%d)\n", ret_val);
1098}
1099
1100subsys_initcall(netlbl_init);