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 */
netlbl_cfg_map_del(const char * domain,u16 family,const void * addr,const void * mask,struct netlbl_audit * audit_info)56 int 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 */
netlbl_cfg_unlbl_map_add(const char * domain,u16 family,const void * addr,const void * mask,struct netlbl_audit * audit_info)95 int 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
182 cfg_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 */
netlbl_cfg_unlbl_static_add(struct net * net,const char * dev_name,const void * addr,const void * mask,u16 family,u32 secid,struct netlbl_audit * audit_info)208 int 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 */
netlbl_cfg_unlbl_static_del(struct net * net,const char * dev_name,const void * addr,const void * mask,u16 family,struct netlbl_audit * audit_info)251 int 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 */
netlbl_cfg_cipsov4_add(struct cipso_v4_doi * doi_def,struct netlbl_audit * audit_info)288 int 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 */
netlbl_cfg_cipsov4_del(u32 doi,struct netlbl_audit * audit_info)304 void 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 */
netlbl_cfg_cipsov4_map_add(u32 doi,const char * domain,const struct in_addr * addr,const struct in_addr * mask,struct netlbl_audit * audit_info)323 int 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
384 cfg_cipsov4_map_add_failure:
385 kfree(addrinfo);
386 out_addrinfo:
387 kfree(addrmap);
388 out_addrmap:
389 kfree(entry->domain);
390 out_domain:
391 kfree(entry);
392 out_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 */
netlbl_cfg_calipso_add(struct calipso_doi * doi_def,struct netlbl_audit * audit_info)407 int 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 */
netlbl_cfg_calipso_del(u32 doi,struct netlbl_audit * audit_info)427 void 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 */
netlbl_cfg_calipso_map_add(u32 doi,const char * domain,const struct in6_addr * addr,const struct in6_addr * mask,struct netlbl_audit * audit_info)448 int 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
514 cfg_calipso_map_add_failure:
515 kfree(addrinfo);
516 out_addrinfo:
517 kfree(addrmap);
518 out_addrmap:
519 kfree(entry->domain);
520 out_domain:
521 kfree(entry);
522 out_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 */
_netlbl_catmap_getnode(struct netlbl_lsm_catmap ** catmap,u32 offset,unsigned int cm_flags,gfp_t gfp_flags)553 static 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
575 catmap_getnode_walk:
576 if (cm_flags & _CM_F_WALK)
577 return iter;
578 catmap_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 */
netlbl_catmap_walk(struct netlbl_lsm_catmap * catmap,u32 offset)608 int netlbl_catmap_walk(struct netlbl_lsm_catmap *catmap, u32 offset)
609 {
610 struct netlbl_lsm_catmap *iter;
611 u32 idx;
612 u32 bit;
613 NETLBL_CATMAP_MAPTYPE bitmap;
614
615 iter = _netlbl_catmap_getnode(&catmap, offset, _CM_F_WALK, 0);
616 if (iter == NULL)
617 return -ENOENT;
618 if (offset > iter->startbit) {
619 offset -= iter->startbit;
620 idx = offset / NETLBL_CATMAP_MAPSIZE;
621 bit = offset % NETLBL_CATMAP_MAPSIZE;
622 } else {
623 idx = 0;
624 bit = 0;
625 }
626 bitmap = iter->bitmap[idx] >> bit;
627
628 for (;;) {
629 if (bitmap != 0) {
630 while ((bitmap & NETLBL_CATMAP_BIT) == 0) {
631 bitmap >>= 1;
632 bit++;
633 }
634 return iter->startbit +
635 (NETLBL_CATMAP_MAPSIZE * idx) + bit;
636 }
637 if (++idx >= NETLBL_CATMAP_MAPCNT) {
638 if (iter->next != NULL) {
639 iter = iter->next;
640 idx = 0;
641 } else
642 return -ENOENT;
643 }
644 bitmap = iter->bitmap[idx];
645 bit = 0;
646 }
647
648 return -ENOENT;
649 }
650 EXPORT_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 */
netlbl_catmap_walkrng(struct netlbl_lsm_catmap * catmap,u32 offset)663 int netlbl_catmap_walkrng(struct netlbl_lsm_catmap *catmap, u32 offset)
664 {
665 struct netlbl_lsm_catmap *iter;
666 struct netlbl_lsm_catmap *prev = NULL;
667 u32 idx;
668 u32 bit;
669 NETLBL_CATMAP_MAPTYPE bitmask;
670 NETLBL_CATMAP_MAPTYPE bitmap;
671
672 iter = _netlbl_catmap_getnode(&catmap, offset, _CM_F_WALK, 0);
673 if (iter == NULL)
674 return -ENOENT;
675 if (offset > iter->startbit) {
676 offset -= iter->startbit;
677 idx = offset / NETLBL_CATMAP_MAPSIZE;
678 bit = offset % NETLBL_CATMAP_MAPSIZE;
679 } else {
680 idx = 0;
681 bit = 0;
682 }
683 bitmask = NETLBL_CATMAP_BIT << bit;
684
685 for (;;) {
686 bitmap = iter->bitmap[idx];
687 while (bitmask != 0 && (bitmap & bitmask) != 0) {
688 bitmask <<= 1;
689 bit++;
690 }
691
692 if (prev && idx == 0 && bit == 0)
693 return prev->startbit + NETLBL_CATMAP_SIZE - 1;
694 else if (bitmask != 0)
695 return iter->startbit +
696 (NETLBL_CATMAP_MAPSIZE * idx) + bit - 1;
697 else if (++idx >= NETLBL_CATMAP_MAPCNT) {
698 if (iter->next == NULL)
699 return iter->startbit + NETLBL_CATMAP_SIZE - 1;
700 prev = iter;
701 iter = iter->next;
702 idx = 0;
703 }
704 bitmask = NETLBL_CATMAP_BIT;
705 bit = 0;
706 }
707
708 return -ENOENT;
709 }
710
711 /**
712 * netlbl_catmap_getlong - Export an unsigned long bitmap
713 * @catmap: pointer to the category bitmap
714 * @offset: pointer to the requested offset
715 * @bitmap: the exported bitmap
716 *
717 * Description:
718 * Export a bitmap with an offset greater than or equal to @offset and return
719 * it in @bitmap. The @offset must be aligned to an unsigned long and will be
720 * updated on return if different from what was requested; if the catmap is
721 * empty at the requested offset and beyond, the @offset is set to (u32)-1.
722 * Returns zero on sucess, negative values on failure.
723 *
724 */
netlbl_catmap_getlong(struct netlbl_lsm_catmap * catmap,u32 * offset,unsigned long * bitmap)725 int 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 */
netlbl_catmap_setbit(struct netlbl_lsm_catmap ** catmap,u32 bit,gfp_t flags)775 int 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 }
792 EXPORT_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 */
netlbl_catmap_setrng(struct netlbl_lsm_catmap ** catmap,u32 start,u32 end,gfp_t flags)806 int 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 */
netlbl_catmap_setlong(struct netlbl_lsm_catmap ** catmap,u32 offset,unsigned long bitmap,gfp_t flags)842 int 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] |= bitmap << (offset % NETLBL_CATMAP_MAPSIZE);
861
862 return 0;
863 }
864
865 /* Bitmap functions
866 */
867
868 /**
869 * netlbl_bitmap_walk - Walk a bitmap looking for a bit
870 * @bitmap: the bitmap
871 * @bitmap_len: length in bits
872 * @offset: starting offset
873 * @state: if non-zero, look for a set (1) bit else look for a cleared (0) bit
874 *
875 * Description:
876 * Starting at @offset, walk the bitmap from left to right until either the
877 * desired bit is found or we reach the end. Return the bit offset, -1 if
878 * not found, or -2 if error.
879 */
netlbl_bitmap_walk(const unsigned char * bitmap,u32 bitmap_len,u32 offset,u8 state)880 int netlbl_bitmap_walk(const unsigned char *bitmap, u32 bitmap_len,
881 u32 offset, u8 state)
882 {
883 u32 bit_spot;
884 u32 byte_offset;
885 unsigned char bitmask;
886 unsigned char byte;
887
888 byte_offset = offset / 8;
889 byte = bitmap[byte_offset];
890 bit_spot = offset;
891 bitmask = 0x80 >> (offset % 8);
892
893 while (bit_spot < bitmap_len) {
894 if ((state && (byte & bitmask) == bitmask) ||
895 (state == 0 && (byte & bitmask) == 0))
896 return bit_spot;
897
898 if (++bit_spot >= bitmap_len)
899 return -1;
900 bitmask >>= 1;
901 if (bitmask == 0) {
902 byte = bitmap[++byte_offset];
903 bitmask = 0x80;
904 }
905 }
906
907 return -1;
908 }
909 EXPORT_SYMBOL(netlbl_bitmap_walk);
910
911 /**
912 * netlbl_bitmap_setbit - Sets a single bit in a bitmap
913 * @bitmap: the bitmap
914 * @bit: the bit
915 * @state: if non-zero, set the bit (1) else clear the bit (0)
916 *
917 * Description:
918 * Set a single bit in the bitmask. Returns zero on success, negative values
919 * on error.
920 */
netlbl_bitmap_setbit(unsigned char * bitmap,u32 bit,u8 state)921 void netlbl_bitmap_setbit(unsigned char *bitmap, u32 bit, u8 state)
922 {
923 u32 byte_spot;
924 u8 bitmask;
925
926 /* gcc always rounds to zero when doing integer division */
927 byte_spot = bit / 8;
928 bitmask = 0x80 >> (bit % 8);
929 if (state)
930 bitmap[byte_spot] |= bitmask;
931 else
932 bitmap[byte_spot] &= ~bitmask;
933 }
934 EXPORT_SYMBOL(netlbl_bitmap_setbit);
935
936 /*
937 * LSM Functions
938 */
939
940 /**
941 * netlbl_enabled - Determine if the NetLabel subsystem is enabled
942 *
943 * Description:
944 * The LSM can use this function to determine if it should use NetLabel
945 * security attributes in it's enforcement mechanism. Currently, NetLabel is
946 * considered to be enabled when it's configuration contains a valid setup for
947 * at least one labeled protocol (i.e. NetLabel can understand incoming
948 * labeled packets of at least one type); otherwise NetLabel is considered to
949 * be disabled.
950 *
951 */
netlbl_enabled(void)952 int netlbl_enabled(void)
953 {
954 /* At some point we probably want to expose this mechanism to the user
955 * as well so that admins can toggle NetLabel regardless of the
956 * configuration */
957 return (atomic_read(&netlabel_mgmt_protocount) > 0);
958 }
959
960 /**
961 * netlbl_sock_setattr - Label a socket using the correct protocol
962 * @sk: the socket to label
963 * @family: protocol family
964 * @secattr: the security attributes
965 *
966 * Description:
967 * Attach the correct label to the given socket using the security attributes
968 * specified in @secattr. This function requires exclusive access to @sk,
969 * which means it either needs to be in the process of being created or locked.
970 * Returns zero on success, -EDESTADDRREQ if the domain is configured to use
971 * network address selectors (can't blindly label the socket), and negative
972 * values on all other failures.
973 *
974 */
netlbl_sock_setattr(struct sock * sk,u16 family,const struct netlbl_lsm_secattr * secattr)975 int netlbl_sock_setattr(struct sock *sk,
976 u16 family,
977 const struct netlbl_lsm_secattr *secattr)
978 {
979 int ret_val;
980 struct netlbl_dom_map *dom_entry;
981
982 rcu_read_lock();
983 dom_entry = netlbl_domhsh_getentry(secattr->domain, family);
984 if (dom_entry == NULL) {
985 ret_val = -ENOENT;
986 goto socket_setattr_return;
987 }
988 switch (family) {
989 case AF_INET:
990 switch (dom_entry->def.type) {
991 case NETLBL_NLTYPE_ADDRSELECT:
992 ret_val = -EDESTADDRREQ;
993 break;
994 case NETLBL_NLTYPE_CIPSOV4:
995 ret_val = cipso_v4_sock_setattr(sk,
996 dom_entry->def.cipso,
997 secattr);
998 break;
999 case NETLBL_NLTYPE_UNLABELED:
1000 ret_val = 0;
1001 break;
1002 default:
1003 ret_val = -ENOENT;
1004 }
1005 break;
1006 #if IS_ENABLED(CONFIG_IPV6)
1007 case AF_INET6:
1008 switch (dom_entry->def.type) {
1009 case NETLBL_NLTYPE_ADDRSELECT:
1010 ret_val = -EDESTADDRREQ;
1011 break;
1012 case NETLBL_NLTYPE_CALIPSO:
1013 ret_val = calipso_sock_setattr(sk,
1014 dom_entry->def.calipso,
1015 secattr);
1016 break;
1017 case NETLBL_NLTYPE_UNLABELED:
1018 ret_val = 0;
1019 break;
1020 default:
1021 ret_val = -ENOENT;
1022 }
1023 break;
1024 #endif /* IPv6 */
1025 default:
1026 ret_val = -EPROTONOSUPPORT;
1027 }
1028
1029 socket_setattr_return:
1030 rcu_read_unlock();
1031 return ret_val;
1032 }
1033
1034 /**
1035 * netlbl_sock_delattr - Delete all the NetLabel labels on a socket
1036 * @sk: the socket
1037 *
1038 * Description:
1039 * Remove all the NetLabel labeling from @sk. The caller is responsible for
1040 * ensuring that @sk is locked.
1041 *
1042 */
netlbl_sock_delattr(struct sock * sk)1043 void netlbl_sock_delattr(struct sock *sk)
1044 {
1045 switch (sk->sk_family) {
1046 case AF_INET:
1047 cipso_v4_sock_delattr(sk);
1048 break;
1049 #if IS_ENABLED(CONFIG_IPV6)
1050 case AF_INET6:
1051 calipso_sock_delattr(sk);
1052 break;
1053 #endif /* IPv6 */
1054 }
1055 }
1056
1057 /**
1058 * netlbl_sock_getattr - Determine the security attributes of a sock
1059 * @sk: the sock
1060 * @secattr: the security attributes
1061 *
1062 * Description:
1063 * Examines the given sock to see if any NetLabel style labeling has been
1064 * applied to the sock, if so it parses the socket label and returns the
1065 * security attributes in @secattr. Returns zero on success, negative values
1066 * on failure.
1067 *
1068 */
netlbl_sock_getattr(struct sock * sk,struct netlbl_lsm_secattr * secattr)1069 int netlbl_sock_getattr(struct sock *sk,
1070 struct netlbl_lsm_secattr *secattr)
1071 {
1072 int ret_val;
1073
1074 switch (sk->sk_family) {
1075 case AF_INET:
1076 ret_val = cipso_v4_sock_getattr(sk, secattr);
1077 break;
1078 #if IS_ENABLED(CONFIG_IPV6)
1079 case AF_INET6:
1080 ret_val = calipso_sock_getattr(sk, secattr);
1081 break;
1082 #endif /* IPv6 */
1083 default:
1084 ret_val = -EPROTONOSUPPORT;
1085 }
1086
1087 return ret_val;
1088 }
1089
1090 /**
1091 * netlbl_conn_setattr - Label a connected socket using the correct protocol
1092 * @sk: the socket to label
1093 * @addr: the destination address
1094 * @secattr: the security attributes
1095 *
1096 * Description:
1097 * Attach the correct label to the given connected socket using the security
1098 * attributes specified in @secattr. The caller is responsible for ensuring
1099 * that @sk is locked. Returns zero on success, negative values on failure.
1100 *
1101 */
netlbl_conn_setattr(struct sock * sk,struct sockaddr * addr,const struct netlbl_lsm_secattr * secattr)1102 int netlbl_conn_setattr(struct sock *sk,
1103 struct sockaddr *addr,
1104 const struct netlbl_lsm_secattr *secattr)
1105 {
1106 int ret_val;
1107 struct sockaddr_in *addr4;
1108 #if IS_ENABLED(CONFIG_IPV6)
1109 struct sockaddr_in6 *addr6;
1110 #endif
1111 struct netlbl_dommap_def *entry;
1112
1113 rcu_read_lock();
1114 switch (addr->sa_family) {
1115 case AF_INET:
1116 addr4 = (struct sockaddr_in *)addr;
1117 entry = netlbl_domhsh_getentry_af4(secattr->domain,
1118 addr4->sin_addr.s_addr);
1119 if (entry == NULL) {
1120 ret_val = -ENOENT;
1121 goto conn_setattr_return;
1122 }
1123 switch (entry->type) {
1124 case NETLBL_NLTYPE_CIPSOV4:
1125 ret_val = cipso_v4_sock_setattr(sk,
1126 entry->cipso, secattr);
1127 break;
1128 case NETLBL_NLTYPE_UNLABELED:
1129 /* just delete the protocols we support for right now
1130 * but we could remove other protocols if needed */
1131 netlbl_sock_delattr(sk);
1132 ret_val = 0;
1133 break;
1134 default:
1135 ret_val = -ENOENT;
1136 }
1137 break;
1138 #if IS_ENABLED(CONFIG_IPV6)
1139 case AF_INET6:
1140 addr6 = (struct sockaddr_in6 *)addr;
1141 entry = netlbl_domhsh_getentry_af6(secattr->domain,
1142 &addr6->sin6_addr);
1143 if (entry == NULL) {
1144 ret_val = -ENOENT;
1145 goto conn_setattr_return;
1146 }
1147 switch (entry->type) {
1148 case NETLBL_NLTYPE_CALIPSO:
1149 ret_val = calipso_sock_setattr(sk,
1150 entry->calipso, secattr);
1151 break;
1152 case NETLBL_NLTYPE_UNLABELED:
1153 /* just delete the protocols we support for right now
1154 * but we could remove other protocols if needed */
1155 netlbl_sock_delattr(sk);
1156 ret_val = 0;
1157 break;
1158 default:
1159 ret_val = -ENOENT;
1160 }
1161 break;
1162 #endif /* IPv6 */
1163 default:
1164 ret_val = -EPROTONOSUPPORT;
1165 }
1166
1167 conn_setattr_return:
1168 rcu_read_unlock();
1169 return ret_val;
1170 }
1171
1172 /**
1173 * netlbl_req_setattr - Label a request socket using the correct protocol
1174 * @req: the request socket to label
1175 * @secattr: the security attributes
1176 *
1177 * Description:
1178 * Attach the correct label to the given socket using the security attributes
1179 * specified in @secattr. Returns zero on success, negative values on failure.
1180 *
1181 */
netlbl_req_setattr(struct request_sock * req,const struct netlbl_lsm_secattr * secattr)1182 int netlbl_req_setattr(struct request_sock *req,
1183 const struct netlbl_lsm_secattr *secattr)
1184 {
1185 int ret_val;
1186 struct netlbl_dommap_def *entry;
1187 struct inet_request_sock *ireq = inet_rsk(req);
1188
1189 rcu_read_lock();
1190 switch (req->rsk_ops->family) {
1191 case AF_INET:
1192 entry = netlbl_domhsh_getentry_af4(secattr->domain,
1193 ireq->ir_rmt_addr);
1194 if (entry == NULL) {
1195 ret_val = -ENOENT;
1196 goto req_setattr_return;
1197 }
1198 switch (entry->type) {
1199 case NETLBL_NLTYPE_CIPSOV4:
1200 ret_val = cipso_v4_req_setattr(req,
1201 entry->cipso, secattr);
1202 break;
1203 case NETLBL_NLTYPE_UNLABELED:
1204 netlbl_req_delattr(req);
1205 ret_val = 0;
1206 break;
1207 default:
1208 ret_val = -ENOENT;
1209 }
1210 break;
1211 #if IS_ENABLED(CONFIG_IPV6)
1212 case AF_INET6:
1213 entry = netlbl_domhsh_getentry_af6(secattr->domain,
1214 &ireq->ir_v6_rmt_addr);
1215 if (entry == NULL) {
1216 ret_val = -ENOENT;
1217 goto req_setattr_return;
1218 }
1219 switch (entry->type) {
1220 case NETLBL_NLTYPE_CALIPSO:
1221 ret_val = calipso_req_setattr(req,
1222 entry->calipso, secattr);
1223 break;
1224 case NETLBL_NLTYPE_UNLABELED:
1225 netlbl_req_delattr(req);
1226 ret_val = 0;
1227 break;
1228 default:
1229 ret_val = -ENOENT;
1230 }
1231 break;
1232 #endif /* IPv6 */
1233 default:
1234 ret_val = -EPROTONOSUPPORT;
1235 }
1236
1237 req_setattr_return:
1238 rcu_read_unlock();
1239 return ret_val;
1240 }
1241
1242 /**
1243 * netlbl_req_delattr - Delete all the NetLabel labels on a socket
1244 * @req: the socket
1245 *
1246 * Description:
1247 * Remove all the NetLabel labeling from @req.
1248 *
1249 */
netlbl_req_delattr(struct request_sock * req)1250 void netlbl_req_delattr(struct request_sock *req)
1251 {
1252 switch (req->rsk_ops->family) {
1253 case AF_INET:
1254 cipso_v4_req_delattr(req);
1255 break;
1256 #if IS_ENABLED(CONFIG_IPV6)
1257 case AF_INET6:
1258 calipso_req_delattr(req);
1259 break;
1260 #endif /* IPv6 */
1261 }
1262 }
1263
1264 /**
1265 * netlbl_skbuff_setattr - Label a packet using the correct protocol
1266 * @skb: the packet
1267 * @family: protocol family
1268 * @secattr: the security attributes
1269 *
1270 * Description:
1271 * Attach the correct label to the given packet using the security attributes
1272 * specified in @secattr. Returns zero on success, negative values on failure.
1273 *
1274 */
netlbl_skbuff_setattr(struct sk_buff * skb,u16 family,const struct netlbl_lsm_secattr * secattr)1275 int netlbl_skbuff_setattr(struct sk_buff *skb,
1276 u16 family,
1277 const struct netlbl_lsm_secattr *secattr)
1278 {
1279 int ret_val;
1280 struct iphdr *hdr4;
1281 #if IS_ENABLED(CONFIG_IPV6)
1282 struct ipv6hdr *hdr6;
1283 #endif
1284 struct netlbl_dommap_def *entry;
1285
1286 rcu_read_lock();
1287 switch (family) {
1288 case AF_INET:
1289 hdr4 = ip_hdr(skb);
1290 entry = netlbl_domhsh_getentry_af4(secattr->domain,
1291 hdr4->daddr);
1292 if (entry == NULL) {
1293 ret_val = -ENOENT;
1294 goto skbuff_setattr_return;
1295 }
1296 switch (entry->type) {
1297 case NETLBL_NLTYPE_CIPSOV4:
1298 ret_val = cipso_v4_skbuff_setattr(skb, entry->cipso,
1299 secattr);
1300 break;
1301 case NETLBL_NLTYPE_UNLABELED:
1302 /* just delete the protocols we support for right now
1303 * but we could remove other protocols if needed */
1304 ret_val = cipso_v4_skbuff_delattr(skb);
1305 break;
1306 default:
1307 ret_val = -ENOENT;
1308 }
1309 break;
1310 #if IS_ENABLED(CONFIG_IPV6)
1311 case AF_INET6:
1312 hdr6 = ipv6_hdr(skb);
1313 entry = netlbl_domhsh_getentry_af6(secattr->domain,
1314 &hdr6->daddr);
1315 if (entry == NULL) {
1316 ret_val = -ENOENT;
1317 goto skbuff_setattr_return;
1318 }
1319 switch (entry->type) {
1320 case NETLBL_NLTYPE_CALIPSO:
1321 ret_val = calipso_skbuff_setattr(skb, entry->calipso,
1322 secattr);
1323 break;
1324 case NETLBL_NLTYPE_UNLABELED:
1325 /* just delete the protocols we support for right now
1326 * but we could remove other protocols if needed */
1327 ret_val = calipso_skbuff_delattr(skb);
1328 break;
1329 default:
1330 ret_val = -ENOENT;
1331 }
1332 break;
1333 #endif /* IPv6 */
1334 default:
1335 ret_val = -EPROTONOSUPPORT;
1336 }
1337
1338 skbuff_setattr_return:
1339 rcu_read_unlock();
1340 return ret_val;
1341 }
1342
1343 /**
1344 * netlbl_skbuff_getattr - Determine the security attributes of a packet
1345 * @skb: the packet
1346 * @family: protocol family
1347 * @secattr: the security attributes
1348 *
1349 * Description:
1350 * Examines the given packet to see if a recognized form of packet labeling
1351 * is present, if so it parses the packet label and returns the security
1352 * attributes in @secattr. Returns zero on success, negative values on
1353 * failure.
1354 *
1355 */
netlbl_skbuff_getattr(const struct sk_buff * skb,u16 family,struct netlbl_lsm_secattr * secattr)1356 int netlbl_skbuff_getattr(const struct sk_buff *skb,
1357 u16 family,
1358 struct netlbl_lsm_secattr *secattr)
1359 {
1360 unsigned char *ptr;
1361
1362 switch (family) {
1363 case AF_INET:
1364 ptr = cipso_v4_optptr(skb);
1365 if (ptr && cipso_v4_getattr(ptr, secattr) == 0)
1366 return 0;
1367 break;
1368 #if IS_ENABLED(CONFIG_IPV6)
1369 case AF_INET6:
1370 ptr = calipso_optptr(skb);
1371 if (ptr && calipso_getattr(ptr, secattr) == 0)
1372 return 0;
1373 break;
1374 #endif /* IPv6 */
1375 }
1376
1377 return netlbl_unlabel_getattr(skb, family, secattr);
1378 }
1379
1380 /**
1381 * netlbl_skbuff_err - Handle a LSM error on a sk_buff
1382 * @skb: the packet
1383 * @family: the family
1384 * @error: the error code
1385 * @gateway: true if host is acting as a gateway, false otherwise
1386 *
1387 * Description:
1388 * Deal with a LSM problem when handling the packet in @skb, typically this is
1389 * a permission denied problem (-EACCES). The correct action is determined
1390 * according to the packet's labeling protocol.
1391 *
1392 */
netlbl_skbuff_err(struct sk_buff * skb,u16 family,int error,int gateway)1393 void netlbl_skbuff_err(struct sk_buff *skb, u16 family, int error, int gateway)
1394 {
1395 switch (family) {
1396 case AF_INET:
1397 if (cipso_v4_optptr(skb))
1398 cipso_v4_error(skb, error, gateway);
1399 break;
1400 }
1401 }
1402
1403 /**
1404 * netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches
1405 *
1406 * Description:
1407 * For all of the NetLabel protocols that support some form of label mapping
1408 * cache, invalidate the cache. Returns zero on success, negative values on
1409 * error.
1410 *
1411 */
netlbl_cache_invalidate(void)1412 void netlbl_cache_invalidate(void)
1413 {
1414 cipso_v4_cache_invalidate();
1415 #if IS_ENABLED(CONFIG_IPV6)
1416 calipso_cache_invalidate();
1417 #endif /* IPv6 */
1418 }
1419
1420 /**
1421 * netlbl_cache_add - Add an entry to a NetLabel protocol cache
1422 * @skb: the packet
1423 * @family: the family
1424 * @secattr: the packet's security attributes
1425 *
1426 * Description:
1427 * Add the LSM security attributes for the given packet to the underlying
1428 * NetLabel protocol's label mapping cache. Returns zero on success, negative
1429 * values on error.
1430 *
1431 */
netlbl_cache_add(const struct sk_buff * skb,u16 family,const struct netlbl_lsm_secattr * secattr)1432 int netlbl_cache_add(const struct sk_buff *skb, u16 family,
1433 const struct netlbl_lsm_secattr *secattr)
1434 {
1435 unsigned char *ptr;
1436
1437 if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0)
1438 return -ENOMSG;
1439
1440 switch (family) {
1441 case AF_INET:
1442 ptr = cipso_v4_optptr(skb);
1443 if (ptr)
1444 return cipso_v4_cache_add(ptr, secattr);
1445 break;
1446 #if IS_ENABLED(CONFIG_IPV6)
1447 case AF_INET6:
1448 ptr = calipso_optptr(skb);
1449 if (ptr)
1450 return calipso_cache_add(ptr, secattr);
1451 break;
1452 #endif /* IPv6 */
1453 }
1454 return -ENOMSG;
1455 }
1456
1457 /*
1458 * Protocol Engine Functions
1459 */
1460
1461 /**
1462 * netlbl_audit_start - Start an audit message
1463 * @type: audit message type
1464 * @audit_info: NetLabel audit information
1465 *
1466 * Description:
1467 * Start an audit message using the type specified in @type and fill the audit
1468 * message with some fields common to all NetLabel audit messages. This
1469 * function should only be used by protocol engines, not LSMs. Returns a
1470 * pointer to the audit buffer on success, NULL on failure.
1471 *
1472 */
netlbl_audit_start(int type,struct netlbl_audit * audit_info)1473 struct audit_buffer *netlbl_audit_start(int type,
1474 struct netlbl_audit *audit_info)
1475 {
1476 return netlbl_audit_start_common(type, audit_info);
1477 }
1478 EXPORT_SYMBOL(netlbl_audit_start);
1479
1480 /*
1481 * Setup Functions
1482 */
1483
1484 /**
1485 * netlbl_init - Initialize NetLabel
1486 *
1487 * Description:
1488 * Perform the required NetLabel initialization before first use.
1489 *
1490 */
netlbl_init(void)1491 static int __init netlbl_init(void)
1492 {
1493 int ret_val;
1494
1495 printk(KERN_INFO "NetLabel: Initializing\n");
1496 printk(KERN_INFO "NetLabel: domain hash size = %u\n",
1497 (1 << NETLBL_DOMHSH_BITSIZE));
1498 printk(KERN_INFO "NetLabel: protocols = UNLABELED CIPSOv4 CALIPSO\n");
1499
1500 ret_val = netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE);
1501 if (ret_val != 0)
1502 goto init_failure;
1503
1504 ret_val = netlbl_unlabel_init(NETLBL_UNLHSH_BITSIZE);
1505 if (ret_val != 0)
1506 goto init_failure;
1507
1508 ret_val = netlbl_netlink_init();
1509 if (ret_val != 0)
1510 goto init_failure;
1511
1512 ret_val = netlbl_unlabel_defconf();
1513 if (ret_val != 0)
1514 goto init_failure;
1515 printk(KERN_INFO "NetLabel: unlabeled traffic allowed by default\n");
1516
1517 return 0;
1518
1519 init_failure:
1520 panic("NetLabel: failed to initialize properly (%d)\n", ret_val);
1521 }
1522
1523 subsys_initcall(netlbl_init);
1524
