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Linux/net/netlabel/netlabel_kapi.c

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  1 /*
  2  * NetLabel Kernel API
  3  *
  4  * This file defines the kernel API for the NetLabel system.  The NetLabel
  5  * system manages static and dynamic label mappings for network protocols such
  6  * as CIPSO and RIPSO.
  7  *
  8  * Author: Paul Moore <paul@paul-moore.com>
  9  *
 10  */
 11 
 12 /*
 13  * (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008
 14  *
 15  * This program is free software;  you can redistribute it and/or modify
 16  * it under the terms of the GNU General Public License as published by
 17  * the Free Software Foundation; either version 2 of the License, or
 18  * (at your option) any later version.
 19  *
 20  * This program is distributed in the hope that it will be useful,
 21  * but WITHOUT ANY WARRANTY;  without even the implied warranty of
 22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 23  * the GNU General Public License for more details.
 24  *
 25  * You should have received a copy of the GNU General Public License
 26  * along with this program;  if not, see <http://www.gnu.org/licenses/>.
 27  *
 28  */
 29 
 30 #include <linux/init.h>
 31 #include <linux/types.h>
 32 #include <linux/slab.h>
 33 #include <linux/audit.h>
 34 #include <linux/in.h>
 35 #include <linux/in6.h>
 36 #include <net/ip.h>
 37 #include <net/ipv6.h>
 38 #include <net/netlabel.h>
 39 #include <net/cipso_ipv4.h>
 40 #include <net/calipso.h>
 41 #include <asm/bug.h>
 42 #include <linux/atomic.h>
 43 
 44 #include "netlabel_domainhash.h"
 45 #include "netlabel_unlabeled.h"
 46 #include "netlabel_cipso_v4.h"
 47 #include "netlabel_calipso.h"
 48 #include "netlabel_user.h"
 49 #include "netlabel_mgmt.h"
 50 #include "netlabel_addrlist.h"
 51 
 52 /*
 53  * Configuration Functions
 54  */
 55 
 56 /**
 57  * netlbl_cfg_map_del - Remove a NetLabel/LSM domain mapping
 58  * @domain: the domain mapping to remove
 59  * @family: address family
 60  * @addr: IP address
 61  * @mask: IP address mask
 62  * @audit_info: NetLabel audit information
 63  *
 64  * Description:
 65  * Removes a NetLabel/LSM domain mapping.  A @domain value of NULL causes the
 66  * default domain mapping to be removed.  Returns zero on success, negative
 67  * values on failure.
 68  *
 69  */
 70 int netlbl_cfg_map_del(const char *domain,
 71                        u16 family,
 72                        const void *addr,
 73                        const void *mask,
 74                        struct netlbl_audit *audit_info)
 75 {
 76         if (addr == NULL && mask == NULL) {
 77                 return netlbl_domhsh_remove(domain, family, audit_info);
 78         } else if (addr != NULL && mask != NULL) {
 79                 switch (family) {
 80                 case AF_INET:
 81                         return netlbl_domhsh_remove_af4(domain, addr, mask,
 82                                                         audit_info);
 83 #if IS_ENABLED(CONFIG_IPV6)
 84                 case AF_INET6:
 85                         return netlbl_domhsh_remove_af6(domain, addr, mask,
 86                                                         audit_info);
 87 #endif /* IPv6 */
 88                 default:
 89                         return -EPFNOSUPPORT;
 90                 }
 91         } else
 92                 return -EINVAL;
 93 }
 94 
 95 /**
 96  * netlbl_cfg_unlbl_map_add - Add a new unlabeled mapping
 97  * @domain: the domain mapping to add
 98  * @family: address family
 99  * @addr: IP address
100  * @mask: IP address mask
101  * @audit_info: NetLabel audit information
102  *
103  * Description:
104  * Adds a new unlabeled NetLabel/LSM domain mapping.  A @domain value of NULL
105  * causes a new default domain mapping to be added.  Returns zero on success,
106  * negative values on failure.
107  *
108  */
109 int netlbl_cfg_unlbl_map_add(const char *domain,
110                              u16 family,
111                              const void *addr,
112                              const void *mask,
113                              struct netlbl_audit *audit_info)
114 {
115         int ret_val = -ENOMEM;
116         struct netlbl_dom_map *entry;
117         struct netlbl_domaddr_map *addrmap = NULL;
118         struct netlbl_domaddr4_map *map4 = NULL;
119         struct netlbl_domaddr6_map *map6 = NULL;
120 
121         entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
122         if (entry == NULL)
123                 return -ENOMEM;
124         if (domain != NULL) {
125                 entry->domain = kstrdup(domain, GFP_ATOMIC);
126                 if (entry->domain == NULL)
127                         goto cfg_unlbl_map_add_failure;
128         }
129         entry->family = family;
130 
131         if (addr == NULL && mask == NULL)
132                 entry->def.type = NETLBL_NLTYPE_UNLABELED;
133         else if (addr != NULL && mask != NULL) {
134                 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
135                 if (addrmap == NULL)
136                         goto cfg_unlbl_map_add_failure;
137                 INIT_LIST_HEAD(&addrmap->list4);
138                 INIT_LIST_HEAD(&addrmap->list6);
139 
140                 switch (family) {
141                 case AF_INET: {
142                         const struct in_addr *addr4 = addr;
143                         const struct in_addr *mask4 = mask;
144                         map4 = kzalloc(sizeof(*map4), GFP_ATOMIC);
145                         if (map4 == NULL)
146                                 goto cfg_unlbl_map_add_failure;
147                         map4->def.type = NETLBL_NLTYPE_UNLABELED;
148                         map4->list.addr = addr4->s_addr & mask4->s_addr;
149                         map4->list.mask = mask4->s_addr;
150                         map4->list.valid = 1;
151                         ret_val = netlbl_af4list_add(&map4->list,
152                                                      &addrmap->list4);
153                         if (ret_val != 0)
154                                 goto cfg_unlbl_map_add_failure;
155                         break;
156                         }
157 #if IS_ENABLED(CONFIG_IPV6)
158                 case AF_INET6: {
159                         const struct in6_addr *addr6 = addr;
160                         const struct in6_addr *mask6 = mask;
161                         map6 = kzalloc(sizeof(*map6), GFP_ATOMIC);
162                         if (map6 == NULL)
163                                 goto cfg_unlbl_map_add_failure;
164                         map6->def.type = NETLBL_NLTYPE_UNLABELED;
165                         map6->list.addr = *addr6;
166                         map6->list.addr.s6_addr32[0] &= mask6->s6_addr32[0];
167                         map6->list.addr.s6_addr32[1] &= mask6->s6_addr32[1];
168                         map6->list.addr.s6_addr32[2] &= mask6->s6_addr32[2];
169                         map6->list.addr.s6_addr32[3] &= mask6->s6_addr32[3];
170                         map6->list.mask = *mask6;
171                         map6->list.valid = 1;
172                         ret_val = netlbl_af6list_add(&map6->list,
173                                                      &addrmap->list6);
174                         if (ret_val != 0)
175                                 goto cfg_unlbl_map_add_failure;
176                         break;
177                         }
178 #endif /* IPv6 */
179                 default:
180                         goto cfg_unlbl_map_add_failure;
181                 }
182 
183                 entry->def.addrsel = addrmap;
184                 entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
185         } else {
186                 ret_val = -EINVAL;
187                 goto cfg_unlbl_map_add_failure;
188         }
189 
190         ret_val = netlbl_domhsh_add(entry, audit_info);
191         if (ret_val != 0)
192                 goto cfg_unlbl_map_add_failure;
193 
194         return 0;
195 
196 cfg_unlbl_map_add_failure:
197         kfree(entry->domain);
198         kfree(entry);
199         kfree(addrmap);
200         kfree(map4);
201         kfree(map6);
202         return ret_val;
203 }
204 
205 
206 /**
207  * netlbl_cfg_unlbl_static_add - Adds a new static label
208  * @net: network namespace
209  * @dev_name: interface name
210  * @addr: IP address in network byte order (struct in[6]_addr)
211  * @mask: address mask in network byte order (struct in[6]_addr)
212  * @family: address family
213  * @secid: LSM secid value for the entry
214  * @audit_info: NetLabel audit information
215  *
216  * Description:
217  * Adds a new NetLabel static label to be used when protocol provided labels
218  * are not present on incoming traffic.  If @dev_name is NULL then the default
219  * interface will be used.  Returns zero on success, negative values on failure.
220  *
221  */
222 int netlbl_cfg_unlbl_static_add(struct net *net,
223                                 const char *dev_name,
224                                 const void *addr,
225                                 const void *mask,
226                                 u16 family,
227                                 u32 secid,
228                                 struct netlbl_audit *audit_info)
229 {
230         u32 addr_len;
231 
232         switch (family) {
233         case AF_INET:
234                 addr_len = sizeof(struct in_addr);
235                 break;
236 #if IS_ENABLED(CONFIG_IPV6)
237         case AF_INET6:
238                 addr_len = sizeof(struct in6_addr);
239                 break;
240 #endif /* IPv6 */
241         default:
242                 return -EPFNOSUPPORT;
243         }
244 
245         return netlbl_unlhsh_add(net,
246                                  dev_name, addr, mask, addr_len,
247                                  secid, audit_info);
248 }
249 
250 /**
251  * netlbl_cfg_unlbl_static_del - Removes an existing static label
252  * @net: network namespace
253  * @dev_name: interface name
254  * @addr: IP address in network byte order (struct in[6]_addr)
255  * @mask: address mask in network byte order (struct in[6]_addr)
256  * @family: address family
257  * @audit_info: NetLabel audit information
258  *
259  * Description:
260  * Removes an existing NetLabel static label used when protocol provided labels
261  * are not present on incoming traffic.  If @dev_name is NULL then the default
262  * interface will be used.  Returns zero on success, negative values on failure.
263  *
264  */
265 int netlbl_cfg_unlbl_static_del(struct net *net,
266                                 const char *dev_name,
267                                 const void *addr,
268                                 const void *mask,
269                                 u16 family,
270                                 struct netlbl_audit *audit_info)
271 {
272         u32 addr_len;
273 
274         switch (family) {
275         case AF_INET:
276                 addr_len = sizeof(struct in_addr);
277                 break;
278 #if IS_ENABLED(CONFIG_IPV6)
279         case AF_INET6:
280                 addr_len = sizeof(struct in6_addr);
281                 break;
282 #endif /* IPv6 */
283         default:
284                 return -EPFNOSUPPORT;
285         }
286 
287         return netlbl_unlhsh_remove(net,
288                                     dev_name, addr, mask, addr_len,
289                                     audit_info);
290 }
291 
292 /**
293  * netlbl_cfg_cipsov4_add - Add a new CIPSOv4 DOI definition
294  * @doi_def: CIPSO DOI definition
295  * @audit_info: NetLabel audit information
296  *
297  * Description:
298  * Add a new CIPSO DOI definition as defined by @doi_def.  Returns zero on
299  * success and negative values on failure.
300  *
301  */
302 int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def,
303                            struct netlbl_audit *audit_info)
304 {
305         return cipso_v4_doi_add(doi_def, audit_info);
306 }
307 
308 /**
309  * netlbl_cfg_cipsov4_del - Remove an existing CIPSOv4 DOI definition
310  * @doi: CIPSO DOI
311  * @audit_info: NetLabel audit information
312  *
313  * Description:
314  * Remove an existing CIPSO DOI definition matching @doi.  Returns zero on
315  * success and negative values on failure.
316  *
317  */
318 void netlbl_cfg_cipsov4_del(u32 doi, struct netlbl_audit *audit_info)
319 {
320         cipso_v4_doi_remove(doi, audit_info);
321 }
322 
323 /**
324  * netlbl_cfg_cipsov4_map_add - Add a new CIPSOv4 DOI mapping
325  * @doi: the CIPSO DOI
326  * @domain: the domain mapping to add
327  * @addr: IP address
328  * @mask: IP address mask
329  * @audit_info: NetLabel audit information
330  *
331  * Description:
332  * Add a new NetLabel/LSM domain mapping for the given CIPSO DOI to the NetLabel
333  * subsystem.  A @domain value of NULL adds a new default domain mapping.
334  * Returns zero on success, negative values on failure.
335  *
336  */
337 int netlbl_cfg_cipsov4_map_add(u32 doi,
338                                const char *domain,
339                                const struct in_addr *addr,
340                                const struct in_addr *mask,
341                                struct netlbl_audit *audit_info)
342 {
343         int ret_val = -ENOMEM;
344         struct cipso_v4_doi *doi_def;
345         struct netlbl_dom_map *entry;
346         struct netlbl_domaddr_map *addrmap = NULL;
347         struct netlbl_domaddr4_map *addrinfo = NULL;
348 
349         doi_def = cipso_v4_doi_getdef(doi);
350         if (doi_def == NULL)
351                 return -ENOENT;
352 
353         entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
354         if (entry == NULL)
355                 goto out_entry;
356         entry->family = AF_INET;
357         if (domain != NULL) {
358                 entry->domain = kstrdup(domain, GFP_ATOMIC);
359                 if (entry->domain == NULL)
360                         goto out_domain;
361         }
362 
363         if (addr == NULL && mask == NULL) {
364                 entry->def.cipso = doi_def;
365                 entry->def.type = NETLBL_NLTYPE_CIPSOV4;
366         } else if (addr != NULL && mask != NULL) {
367                 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
368                 if (addrmap == NULL)
369                         goto out_addrmap;
370                 INIT_LIST_HEAD(&addrmap->list4);
371                 INIT_LIST_HEAD(&addrmap->list6);
372 
373                 addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC);
374                 if (addrinfo == NULL)
375                         goto out_addrinfo;
376                 addrinfo->def.cipso = doi_def;
377                 addrinfo->def.type = NETLBL_NLTYPE_CIPSOV4;
378                 addrinfo->list.addr = addr->s_addr & mask->s_addr;
379                 addrinfo->list.mask = mask->s_addr;
380                 addrinfo->list.valid = 1;
381                 ret_val = netlbl_af4list_add(&addrinfo->list, &addrmap->list4);
382                 if (ret_val != 0)
383                         goto cfg_cipsov4_map_add_failure;
384 
385                 entry->def.addrsel = addrmap;
386                 entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
387         } else {
388                 ret_val = -EINVAL;
389                 goto out_addrmap;
390         }
391 
392         ret_val = netlbl_domhsh_add(entry, audit_info);
393         if (ret_val != 0)
394                 goto cfg_cipsov4_map_add_failure;
395 
396         return 0;
397 
398 cfg_cipsov4_map_add_failure:
399         kfree(addrinfo);
400 out_addrinfo:
401         kfree(addrmap);
402 out_addrmap:
403         kfree(entry->domain);
404 out_domain:
405         kfree(entry);
406 out_entry:
407         cipso_v4_doi_putdef(doi_def);
408         return ret_val;
409 }
410 
411 /**
412  * netlbl_cfg_calipso_add - Add a new CALIPSO DOI definition
413  * @doi_def: CALIPSO DOI definition
414  * @audit_info: NetLabel audit information
415  *
416  * Description:
417  * Add a new CALIPSO DOI definition as defined by @doi_def.  Returns zero on
418  * success and negative values on failure.
419  *
420  */
421 int netlbl_cfg_calipso_add(struct calipso_doi *doi_def,
422                            struct netlbl_audit *audit_info)
423 {
424 #if IS_ENABLED(CONFIG_IPV6)
425         return calipso_doi_add(doi_def, audit_info);
426 #else /* IPv6 */
427         return -ENOSYS;
428 #endif /* IPv6 */
429 }
430 
431 /**
432  * netlbl_cfg_calipso_del - Remove an existing CALIPSO DOI definition
433  * @doi: CALIPSO DOI
434  * @audit_info: NetLabel audit information
435  *
436  * Description:
437  * Remove an existing CALIPSO DOI definition matching @doi.  Returns zero on
438  * success and negative values on failure.
439  *
440  */
441 void netlbl_cfg_calipso_del(u32 doi, struct netlbl_audit *audit_info)
442 {
443 #if IS_ENABLED(CONFIG_IPV6)
444         calipso_doi_remove(doi, audit_info);
445 #endif /* IPv6 */
446 }
447 
448 /**
449  * netlbl_cfg_calipso_map_add - Add a new CALIPSO DOI mapping
450  * @doi: the CALIPSO DOI
451  * @domain: the domain mapping to add
452  * @addr: IP address
453  * @mask: IP address mask
454  * @audit_info: NetLabel audit information
455  *
456  * Description:
457  * Add a new NetLabel/LSM domain mapping for the given CALIPSO DOI to the
458  * NetLabel subsystem.  A @domain value of NULL adds a new default domain
459  * mapping.  Returns zero on success, negative values on failure.
460  *
461  */
462 int netlbl_cfg_calipso_map_add(u32 doi,
463                                const char *domain,
464                                const struct in6_addr *addr,
465                                const struct in6_addr *mask,
466                                struct netlbl_audit *audit_info)
467 {
468 #if IS_ENABLED(CONFIG_IPV6)
469         int ret_val = -ENOMEM;
470         struct calipso_doi *doi_def;
471         struct netlbl_dom_map *entry;
472         struct netlbl_domaddr_map *addrmap = NULL;
473         struct netlbl_domaddr6_map *addrinfo = NULL;
474 
475         doi_def = calipso_doi_getdef(doi);
476         if (doi_def == NULL)
477                 return -ENOENT;
478 
479         entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
480         if (entry == NULL)
481                 goto out_entry;
482         entry->family = AF_INET6;
483         if (domain != NULL) {
484                 entry->domain = kstrdup(domain, GFP_ATOMIC);
485                 if (entry->domain == NULL)
486                         goto out_domain;
487         }
488 
489         if (addr == NULL && mask == NULL) {
490                 entry->def.calipso = doi_def;
491                 entry->def.type = NETLBL_NLTYPE_CALIPSO;
492         } else if (addr != NULL && mask != NULL) {
493                 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
494                 if (addrmap == NULL)
495                         goto out_addrmap;
496                 INIT_LIST_HEAD(&addrmap->list4);
497                 INIT_LIST_HEAD(&addrmap->list6);
498 
499                 addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC);
500                 if (addrinfo == NULL)
501                         goto out_addrinfo;
502                 addrinfo->def.calipso = doi_def;
503                 addrinfo->def.type = NETLBL_NLTYPE_CALIPSO;
504                 addrinfo->list.addr = *addr;
505                 addrinfo->list.addr.s6_addr32[0] &= mask->s6_addr32[0];
506                 addrinfo->list.addr.s6_addr32[1] &= mask->s6_addr32[1];
507                 addrinfo->list.addr.s6_addr32[2] &= mask->s6_addr32[2];
508                 addrinfo->list.addr.s6_addr32[3] &= mask->s6_addr32[3];
509                 addrinfo->list.mask = *mask;
510                 addrinfo->list.valid = 1;
511                 ret_val = netlbl_af6list_add(&addrinfo->list, &addrmap->list6);
512                 if (ret_val != 0)
513                         goto cfg_calipso_map_add_failure;
514 
515                 entry->def.addrsel = addrmap;
516                 entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
517         } else {
518                 ret_val = -EINVAL;
519                 goto out_addrmap;
520         }
521 
522         ret_val = netlbl_domhsh_add(entry, audit_info);
523         if (ret_val != 0)
524                 goto cfg_calipso_map_add_failure;
525 
526         return 0;
527 
528 cfg_calipso_map_add_failure:
529         kfree(addrinfo);
530 out_addrinfo:
531         kfree(addrmap);
532 out_addrmap:
533         kfree(entry->domain);
534 out_domain:
535         kfree(entry);
536 out_entry:
537         calipso_doi_putdef(doi_def);
538         return ret_val;
539 #else /* IPv6 */
540         return -ENOSYS;
541 #endif /* IPv6 */
542 }
543 
544 /*
545  * Security Attribute Functions
546  */
547 
548 #define _CM_F_NONE      0x00000000
549 #define _CM_F_ALLOC     0x00000001
550 #define _CM_F_WALK      0x00000002
551 
552 /**
553  * _netlbl_catmap_getnode - Get a individual node from a catmap
554  * @catmap: pointer to the category bitmap
555  * @offset: the requested offset
556  * @cm_flags: catmap flags, see _CM_F_*
557  * @gfp_flags: memory allocation flags
558  *
559  * Description:
560  * Iterate through the catmap looking for the node associated with @offset.
561  * If the _CM_F_ALLOC flag is set in @cm_flags and there is no associated node,
562  * one will be created and inserted into the catmap.  If the _CM_F_WALK flag is
563  * set in @cm_flags and there is no associated node, the next highest node will
564  * be returned.  Returns a pointer to the node on success, NULL on failure.
565  *
566  */
567 static struct netlbl_lsm_catmap *_netlbl_catmap_getnode(
568                                              struct netlbl_lsm_catmap **catmap,
569                                              u32 offset,
570                                              unsigned int cm_flags,
571                                              gfp_t gfp_flags)
572 {
573         struct netlbl_lsm_catmap *iter = *catmap;
574         struct netlbl_lsm_catmap *prev = NULL;
575 
576         if (iter == NULL)
577                 goto catmap_getnode_alloc;
578         if (offset < iter->startbit)
579                 goto catmap_getnode_walk;
580         while (iter && offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
581                 prev = iter;
582                 iter = iter->next;
583         }
584         if (iter == NULL || offset < iter->startbit)
585                 goto catmap_getnode_walk;
586 
587         return iter;
588 
589 catmap_getnode_walk:
590         if (cm_flags & _CM_F_WALK)
591                 return iter;
592 catmap_getnode_alloc:
593         if (!(cm_flags & _CM_F_ALLOC))
594                 return NULL;
595 
596         iter = netlbl_catmap_alloc(gfp_flags);
597         if (iter == NULL)
598                 return NULL;
599         iter->startbit = offset & ~(NETLBL_CATMAP_SIZE - 1);
600 
601         if (prev == NULL) {
602                 iter->next = *catmap;
603                 *catmap = iter;
604         } else {
605                 iter->next = prev->next;
606                 prev->next = iter;
607         }
608 
609         return iter;
610 }
611 
612 /**
613  * netlbl_catmap_walk - Walk a LSM secattr catmap looking for a bit
614  * @catmap: the category bitmap
615  * @offset: the offset to start searching at, in bits
616  *
617  * Description:
618  * This function walks a LSM secattr category bitmap starting at @offset and
619  * returns the spot of the first set bit or -ENOENT if no bits are set.
620  *
621  */
622 int netlbl_catmap_walk(struct netlbl_lsm_catmap *catmap, u32 offset)
623 {
624         struct netlbl_lsm_catmap *iter = catmap;
625         u32 idx;
626         u32 bit;
627         NETLBL_CATMAP_MAPTYPE bitmap;
628 
629         iter = _netlbl_catmap_getnode(&catmap, offset, _CM_F_WALK, 0);
630         if (iter == NULL)
631                 return -ENOENT;
632         if (offset > iter->startbit) {
633                 offset -= iter->startbit;
634                 idx = offset / NETLBL_CATMAP_MAPSIZE;
635                 bit = offset % NETLBL_CATMAP_MAPSIZE;
636         } else {
637                 idx = 0;
638                 bit = 0;
639         }
640         bitmap = iter->bitmap[idx] >> bit;
641 
642         for (;;) {
643                 if (bitmap != 0) {
644                         while ((bitmap & NETLBL_CATMAP_BIT) == 0) {
645                                 bitmap >>= 1;
646                                 bit++;
647                         }
648                         return iter->startbit +
649                                (NETLBL_CATMAP_MAPSIZE * idx) + bit;
650                 }
651                 if (++idx >= NETLBL_CATMAP_MAPCNT) {
652                         if (iter->next != NULL) {
653                                 iter = iter->next;
654                                 idx = 0;
655                         } else
656                                 return -ENOENT;
657                 }
658                 bitmap = iter->bitmap[idx];
659                 bit = 0;
660         }
661 
662         return -ENOENT;
663 }
664 EXPORT_SYMBOL(netlbl_catmap_walk);
665 
666 /**
667  * netlbl_catmap_walkrng - Find the end of a string of set bits
668  * @catmap: the category bitmap
669  * @offset: the offset to start searching at, in bits
670  *
671  * Description:
672  * This function walks a LSM secattr category bitmap starting at @offset and
673  * returns the spot of the first cleared bit or -ENOENT if the offset is past
674  * the end of the bitmap.
675  *
676  */
677 int netlbl_catmap_walkrng(struct netlbl_lsm_catmap *catmap, u32 offset)
678 {
679         struct netlbl_lsm_catmap *iter;
680         struct netlbl_lsm_catmap *prev = NULL;
681         u32 idx;
682         u32 bit;
683         NETLBL_CATMAP_MAPTYPE bitmask;
684         NETLBL_CATMAP_MAPTYPE bitmap;
685 
686         iter = _netlbl_catmap_getnode(&catmap, offset, _CM_F_WALK, 0);
687         if (iter == NULL)
688                 return -ENOENT;
689         if (offset > iter->startbit) {
690                 offset -= iter->startbit;
691                 idx = offset / NETLBL_CATMAP_MAPSIZE;
692                 bit = offset % NETLBL_CATMAP_MAPSIZE;
693         } else {
694                 idx = 0;
695                 bit = 0;
696         }
697         bitmask = NETLBL_CATMAP_BIT << bit;
698 
699         for (;;) {
700                 bitmap = iter->bitmap[idx];
701                 while (bitmask != 0 && (bitmap & bitmask) != 0) {
702                         bitmask <<= 1;
703                         bit++;
704                 }
705 
706                 if (prev && idx == 0 && bit == 0)
707                         return prev->startbit + NETLBL_CATMAP_SIZE - 1;
708                 else if (bitmask != 0)
709                         return iter->startbit +
710                                 (NETLBL_CATMAP_MAPSIZE * idx) + bit - 1;
711                 else if (++idx >= NETLBL_CATMAP_MAPCNT) {
712                         if (iter->next == NULL)
713                                 return iter->startbit + NETLBL_CATMAP_SIZE - 1;
714                         prev = iter;
715                         iter = iter->next;
716                         idx = 0;
717                 }
718                 bitmask = NETLBL_CATMAP_BIT;
719                 bit = 0;
720         }
721 
722         return -ENOENT;
723 }
724 
725 /**
726  * netlbl_catmap_getlong - Export an unsigned long bitmap
727  * @catmap: pointer to the category bitmap
728  * @offset: pointer to the requested offset
729  * @bitmap: the exported bitmap
730  *
731  * Description:
732  * Export a bitmap with an offset greater than or equal to @offset and return
733  * it in @bitmap.  The @offset must be aligned to an unsigned long and will be
734  * updated on return if different from what was requested; if the catmap is
735  * empty at the requested offset and beyond, the @offset is set to (u32)-1.
736  * Returns zero on sucess, negative values on failure.
737  *
738  */
739 int netlbl_catmap_getlong(struct netlbl_lsm_catmap *catmap,
740                           u32 *offset,
741                           unsigned long *bitmap)
742 {
743         struct netlbl_lsm_catmap *iter;
744         u32 off = *offset;
745         u32 idx;
746 
747         /* only allow aligned offsets */
748         if ((off & (BITS_PER_LONG - 1)) != 0)
749                 return -EINVAL;
750 
751         if (off < catmap->startbit) {
752                 off = catmap->startbit;
753                 *offset = off;
754         }
755         iter = _netlbl_catmap_getnode(&catmap, off, _CM_F_WALK, 0);
756         if (iter == NULL) {
757                 *offset = (u32)-1;
758                 return 0;
759         }
760 
761         if (off < iter->startbit) {
762                 *offset = iter->startbit;
763                 off = 0;
764         } else
765                 off -= iter->startbit;
766         idx = off / NETLBL_CATMAP_MAPSIZE;
767         *bitmap = iter->bitmap[idx] >> (off % NETLBL_CATMAP_MAPSIZE);
768 
769         return 0;
770 }
771 
772 /**
773  * netlbl_catmap_setbit - Set a bit in a LSM secattr catmap
774  * @catmap: pointer to the category bitmap
775  * @bit: the bit to set
776  * @flags: memory allocation flags
777  *
778  * Description:
779  * Set the bit specified by @bit in @catmap.  Returns zero on success,
780  * negative values on failure.
781  *
782  */
783 int netlbl_catmap_setbit(struct netlbl_lsm_catmap **catmap,
784                          u32 bit,
785                          gfp_t flags)
786 {
787         struct netlbl_lsm_catmap *iter;
788         u32 idx;
789 
790         iter = _netlbl_catmap_getnode(catmap, bit, _CM_F_ALLOC, flags);
791         if (iter == NULL)
792                 return -ENOMEM;
793 
794         bit -= iter->startbit;
795         idx = bit / NETLBL_CATMAP_MAPSIZE;
796         iter->bitmap[idx] |= NETLBL_CATMAP_BIT << (bit % NETLBL_CATMAP_MAPSIZE);
797 
798         return 0;
799 }
800 EXPORT_SYMBOL(netlbl_catmap_setbit);
801 
802 /**
803  * netlbl_catmap_setrng - Set a range of bits in a LSM secattr catmap
804  * @catmap: pointer to the category bitmap
805  * @start: the starting bit
806  * @end: the last bit in the string
807  * @flags: memory allocation flags
808  *
809  * Description:
810  * Set a range of bits, starting at @start and ending with @end.  Returns zero
811  * on success, negative values on failure.
812  *
813  */
814 int netlbl_catmap_setrng(struct netlbl_lsm_catmap **catmap,
815                          u32 start,
816                          u32 end,
817                          gfp_t flags)
818 {
819         int rc = 0;
820         u32 spot = start;
821 
822         while (rc == 0 && spot <= end) {
823                 if (((spot & (BITS_PER_LONG - 1)) == 0) &&
824                     ((end - spot) > BITS_PER_LONG)) {
825                         rc = netlbl_catmap_setlong(catmap,
826                                                    spot,
827                                                    (unsigned long)-1,
828                                                    flags);
829                         spot += BITS_PER_LONG;
830                 } else
831                         rc = netlbl_catmap_setbit(catmap, spot++, flags);
832         }
833 
834         return rc;
835 }
836 
837 /**
838  * netlbl_catmap_setlong - Import an unsigned long bitmap
839  * @catmap: pointer to the category bitmap
840  * @offset: offset to the start of the imported bitmap
841  * @bitmap: the bitmap to import
842  * @flags: memory allocation flags
843  *
844  * Description:
845  * Import the bitmap specified in @bitmap into @catmap, using the offset
846  * in @offset.  The offset must be aligned to an unsigned long.  Returns zero
847  * on success, negative values on failure.
848  *
849  */
850 int netlbl_catmap_setlong(struct netlbl_lsm_catmap **catmap,
851                           u32 offset,
852                           unsigned long bitmap,
853                           gfp_t flags)
854 {
855         struct netlbl_lsm_catmap *iter;
856         u32 idx;
857 
858         /* only allow aligned offsets */
859         if ((offset & (BITS_PER_LONG - 1)) != 0)
860                 return -EINVAL;
861 
862         iter = _netlbl_catmap_getnode(catmap, offset, _CM_F_ALLOC, flags);
863         if (iter == NULL)
864                 return -ENOMEM;
865 
866         offset -= iter->startbit;
867         idx = offset / NETLBL_CATMAP_MAPSIZE;
868         iter->bitmap[idx] |= bitmap << (offset % NETLBL_CATMAP_MAPSIZE);
869 
870         return 0;
871 }
872 
873 /* Bitmap functions
874  */
875 
876 /**
877  * netlbl_bitmap_walk - Walk a bitmap looking for a bit
878  * @bitmap: the bitmap
879  * @bitmap_len: length in bits
880  * @offset: starting offset
881  * @state: if non-zero, look for a set (1) bit else look for a cleared (0) bit
882  *
883  * Description:
884  * Starting at @offset, walk the bitmap from left to right until either the
885  * desired bit is found or we reach the end.  Return the bit offset, -1 if
886  * not found, or -2 if error.
887  */
888 int netlbl_bitmap_walk(const unsigned char *bitmap, u32 bitmap_len,
889                        u32 offset, u8 state)
890 {
891         u32 bit_spot;
892         u32 byte_offset;
893         unsigned char bitmask;
894         unsigned char byte;
895 
896         byte_offset = offset / 8;
897         byte = bitmap[byte_offset];
898         bit_spot = offset;
899         bitmask = 0x80 >> (offset % 8);
900 
901         while (bit_spot < bitmap_len) {
902                 if ((state && (byte & bitmask) == bitmask) ||
903                     (state == 0 && (byte & bitmask) == 0))
904                         return bit_spot;
905 
906                 bit_spot++;
907                 bitmask >>= 1;
908                 if (bitmask == 0) {
909                         byte = bitmap[++byte_offset];
910                         bitmask = 0x80;
911                 }
912         }
913 
914         return -1;
915 }
916 EXPORT_SYMBOL(netlbl_bitmap_walk);
917 
918 /**
919  * netlbl_bitmap_setbit - Sets a single bit in a bitmap
920  * @bitmap: the bitmap
921  * @bit: the bit
922  * @state: if non-zero, set the bit (1) else clear the bit (0)
923  *
924  * Description:
925  * Set a single bit in the bitmask.  Returns zero on success, negative values
926  * on error.
927  */
928 void netlbl_bitmap_setbit(unsigned char *bitmap, u32 bit, u8 state)
929 {
930         u32 byte_spot;
931         u8 bitmask;
932 
933         /* gcc always rounds to zero when doing integer division */
934         byte_spot = bit / 8;
935         bitmask = 0x80 >> (bit % 8);
936         if (state)
937                 bitmap[byte_spot] |= bitmask;
938         else
939                 bitmap[byte_spot] &= ~bitmask;
940 }
941 EXPORT_SYMBOL(netlbl_bitmap_setbit);
942 
943 /*
944  * LSM Functions
945  */
946 
947 /**
948  * netlbl_enabled - Determine if the NetLabel subsystem is enabled
949  *
950  * Description:
951  * The LSM can use this function to determine if it should use NetLabel
952  * security attributes in it's enforcement mechanism.  Currently, NetLabel is
953  * considered to be enabled when it's configuration contains a valid setup for
954  * at least one labeled protocol (i.e. NetLabel can understand incoming
955  * labeled packets of at least one type); otherwise NetLabel is considered to
956  * be disabled.
957  *
958  */
959 int netlbl_enabled(void)
960 {
961         /* At some point we probably want to expose this mechanism to the user
962          * as well so that admins can toggle NetLabel regardless of the
963          * configuration */
964         return (atomic_read(&netlabel_mgmt_protocount) > 0);
965 }
966 
967 /**
968  * netlbl_sock_setattr - Label a socket using the correct protocol
969  * @sk: the socket to label
970  * @family: protocol family
971  * @secattr: the security attributes
972  *
973  * Description:
974  * Attach the correct label to the given socket using the security attributes
975  * specified in @secattr.  This function requires exclusive access to @sk,
976  * which means it either needs to be in the process of being created or locked.
977  * Returns zero on success, -EDESTADDRREQ if the domain is configured to use
978  * network address selectors (can't blindly label the socket), and negative
979  * values on all other failures.
980  *
981  */
982 int netlbl_sock_setattr(struct sock *sk,
983                         u16 family,
984                         const struct netlbl_lsm_secattr *secattr)
985 {
986         int ret_val;
987         struct netlbl_dom_map *dom_entry;
988 
989         rcu_read_lock();
990         dom_entry = netlbl_domhsh_getentry(secattr->domain, family);
991         if (dom_entry == NULL) {
992                 ret_val = -ENOENT;
993                 goto socket_setattr_return;
994         }
995         switch (family) {
996         case AF_INET:
997                 switch (dom_entry->def.type) {
998                 case NETLBL_NLTYPE_ADDRSELECT:
999                         ret_val = -EDESTADDRREQ;
1000                         break;
1001                 case NETLBL_NLTYPE_CIPSOV4:
1002                         ret_val = cipso_v4_sock_setattr(sk,
1003                                                         dom_entry->def.cipso,
1004                                                         secattr);
1005                         break;
1006                 case NETLBL_NLTYPE_UNLABELED:
1007                         ret_val = 0;
1008                         break;
1009                 default:
1010                         ret_val = -ENOENT;
1011                 }
1012                 break;
1013 #if IS_ENABLED(CONFIG_IPV6)
1014         case AF_INET6:
1015                 switch (dom_entry->def.type) {
1016                 case NETLBL_NLTYPE_ADDRSELECT:
1017                         ret_val = -EDESTADDRREQ;
1018                         break;
1019                 case NETLBL_NLTYPE_CALIPSO:
1020                         ret_val = calipso_sock_setattr(sk,
1021                                                        dom_entry->def.calipso,
1022                                                        secattr);
1023                         break;
1024                 case NETLBL_NLTYPE_UNLABELED:
1025                         ret_val = 0;
1026                         break;
1027                 default:
1028                         ret_val = -ENOENT;
1029                 }
1030                 break;
1031 #endif /* IPv6 */
1032         default:
1033                 ret_val = -EPROTONOSUPPORT;
1034         }
1035 
1036 socket_setattr_return:
1037         rcu_read_unlock();
1038         return ret_val;
1039 }
1040 
1041 /**
1042  * netlbl_sock_delattr - Delete all the NetLabel labels on a socket
1043  * @sk: the socket
1044  *
1045  * Description:
1046  * Remove all the NetLabel labeling from @sk.  The caller is responsible for
1047  * ensuring that @sk is locked.
1048  *
1049  */
1050 void netlbl_sock_delattr(struct sock *sk)
1051 {
1052         switch (sk->sk_family) {
1053         case AF_INET:
1054                 cipso_v4_sock_delattr(sk);
1055                 break;
1056 #if IS_ENABLED(CONFIG_IPV6)
1057         case AF_INET6:
1058                 calipso_sock_delattr(sk);
1059                 break;
1060 #endif /* IPv6 */
1061         }
1062 }
1063 
1064 /**
1065  * netlbl_sock_getattr - Determine the security attributes of a sock
1066  * @sk: the sock
1067  * @secattr: the security attributes
1068  *
1069  * Description:
1070  * Examines the given sock to see if any NetLabel style labeling has been
1071  * applied to the sock, if so it parses the socket label and returns the
1072  * security attributes in @secattr.  Returns zero on success, negative values
1073  * on failure.
1074  *
1075  */
1076 int netlbl_sock_getattr(struct sock *sk,
1077                         struct netlbl_lsm_secattr *secattr)
1078 {
1079         int ret_val;
1080 
1081         switch (sk->sk_family) {
1082         case AF_INET:
1083                 ret_val = cipso_v4_sock_getattr(sk, secattr);
1084                 break;
1085 #if IS_ENABLED(CONFIG_IPV6)
1086         case AF_INET6:
1087                 ret_val = calipso_sock_getattr(sk, secattr);
1088                 break;
1089 #endif /* IPv6 */
1090         default:
1091                 ret_val = -EPROTONOSUPPORT;
1092         }
1093 
1094         return ret_val;
1095 }
1096 
1097 /**
1098  * netlbl_conn_setattr - Label a connected socket using the correct protocol
1099  * @sk: the socket to label
1100  * @addr: the destination address
1101  * @secattr: the security attributes
1102  *
1103  * Description:
1104  * Attach the correct label to the given connected socket using the security
1105  * attributes specified in @secattr.  The caller is responsible for ensuring
1106  * that @sk is locked.  Returns zero on success, negative values on failure.
1107  *
1108  */
1109 int netlbl_conn_setattr(struct sock *sk,
1110                         struct sockaddr *addr,
1111                         const struct netlbl_lsm_secattr *secattr)
1112 {
1113         int ret_val;
1114         struct sockaddr_in *addr4;
1115 #if IS_ENABLED(CONFIG_IPV6)
1116         struct sockaddr_in6 *addr6;
1117 #endif
1118         struct netlbl_dommap_def *entry;
1119 
1120         rcu_read_lock();
1121         switch (addr->sa_family) {
1122         case AF_INET:
1123                 addr4 = (struct sockaddr_in *)addr;
1124                 entry = netlbl_domhsh_getentry_af4(secattr->domain,
1125                                                    addr4->sin_addr.s_addr);
1126                 if (entry == NULL) {
1127                         ret_val = -ENOENT;
1128                         goto conn_setattr_return;
1129                 }
1130                 switch (entry->type) {
1131                 case NETLBL_NLTYPE_CIPSOV4:
1132                         ret_val = cipso_v4_sock_setattr(sk,
1133                                                         entry->cipso, secattr);
1134                         break;
1135                 case NETLBL_NLTYPE_UNLABELED:
1136                         /* just delete the protocols we support for right now
1137                          * but we could remove other protocols if needed */
1138                         netlbl_sock_delattr(sk);
1139                         ret_val = 0;
1140                         break;
1141                 default:
1142                         ret_val = -ENOENT;
1143                 }
1144                 break;
1145 #if IS_ENABLED(CONFIG_IPV6)
1146         case AF_INET6:
1147                 addr6 = (struct sockaddr_in6 *)addr;
1148                 entry = netlbl_domhsh_getentry_af6(secattr->domain,
1149                                                    &addr6->sin6_addr);
1150                 if (entry == NULL) {
1151                         ret_val = -ENOENT;
1152                         goto conn_setattr_return;
1153                 }
1154                 switch (entry->type) {
1155                 case NETLBL_NLTYPE_CALIPSO:
1156                         ret_val = calipso_sock_setattr(sk,
1157                                                        entry->calipso, secattr);
1158                         break;
1159                 case NETLBL_NLTYPE_UNLABELED:
1160                         /* just delete the protocols we support for right now
1161                          * but we could remove other protocols if needed */
1162                         netlbl_sock_delattr(sk);
1163                         ret_val = 0;
1164                         break;
1165                 default:
1166                         ret_val = -ENOENT;
1167                 }
1168                 break;
1169 #endif /* IPv6 */
1170         default:
1171                 ret_val = -EPROTONOSUPPORT;
1172         }
1173 
1174 conn_setattr_return:
1175         rcu_read_unlock();
1176         return ret_val;
1177 }
1178 
1179 /**
1180  * netlbl_req_setattr - Label a request socket using the correct protocol
1181  * @req: the request socket to label
1182  * @secattr: the security attributes
1183  *
1184  * Description:
1185  * Attach the correct label to the given socket using the security attributes
1186  * specified in @secattr.  Returns zero on success, negative values on failure.
1187  *
1188  */
1189 int netlbl_req_setattr(struct request_sock *req,
1190                        const struct netlbl_lsm_secattr *secattr)
1191 {
1192         int ret_val;
1193         struct netlbl_dommap_def *entry;
1194         struct inet_request_sock *ireq = inet_rsk(req);
1195 
1196         rcu_read_lock();
1197         switch (req->rsk_ops->family) {
1198         case AF_INET:
1199                 entry = netlbl_domhsh_getentry_af4(secattr->domain,
1200                                                    ireq->ir_rmt_addr);
1201                 if (entry == NULL) {
1202                         ret_val = -ENOENT;
1203                         goto req_setattr_return;
1204                 }
1205                 switch (entry->type) {
1206                 case NETLBL_NLTYPE_CIPSOV4:
1207                         ret_val = cipso_v4_req_setattr(req,
1208                                                        entry->cipso, secattr);
1209                         break;
1210                 case NETLBL_NLTYPE_UNLABELED:
1211                         netlbl_req_delattr(req);
1212                         ret_val = 0;
1213                         break;
1214                 default:
1215                         ret_val = -ENOENT;
1216                 }
1217                 break;
1218 #if IS_ENABLED(CONFIG_IPV6)
1219         case AF_INET6:
1220                 entry = netlbl_domhsh_getentry_af6(secattr->domain,
1221                                                    &ireq->ir_v6_rmt_addr);
1222                 if (entry == NULL) {
1223                         ret_val = -ENOENT;
1224                         goto req_setattr_return;
1225                 }
1226                 switch (entry->type) {
1227                 case NETLBL_NLTYPE_CALIPSO:
1228                         ret_val = calipso_req_setattr(req,
1229                                                       entry->calipso, secattr);
1230                         break;
1231                 case NETLBL_NLTYPE_UNLABELED:
1232                         netlbl_req_delattr(req);
1233                         ret_val = 0;
1234                         break;
1235                 default:
1236                         ret_val = -ENOENT;
1237                 }
1238                 break;
1239 #endif /* IPv6 */
1240         default:
1241                 ret_val = -EPROTONOSUPPORT;
1242         }
1243 
1244 req_setattr_return:
1245         rcu_read_unlock();
1246         return ret_val;
1247 }
1248 
1249 /**
1250 * netlbl_req_delattr - Delete all the NetLabel labels on a socket
1251 * @req: the socket
1252 *
1253 * Description:
1254 * Remove all the NetLabel labeling from @req.
1255 *
1256 */
1257 void netlbl_req_delattr(struct request_sock *req)
1258 {
1259         switch (req->rsk_ops->family) {
1260         case AF_INET:
1261                 cipso_v4_req_delattr(req);
1262                 break;
1263 #if IS_ENABLED(CONFIG_IPV6)
1264         case AF_INET6:
1265                 calipso_req_delattr(req);
1266                 break;
1267 #endif /* IPv6 */
1268         }
1269 }
1270 
1271 /**
1272  * netlbl_skbuff_setattr - Label a packet using the correct protocol
1273  * @skb: the packet
1274  * @family: protocol family
1275  * @secattr: the security attributes
1276  *
1277  * Description:
1278  * Attach the correct label to the given packet using the security attributes
1279  * specified in @secattr.  Returns zero on success, negative values on failure.
1280  *
1281  */
1282 int netlbl_skbuff_setattr(struct sk_buff *skb,
1283                           u16 family,
1284                           const struct netlbl_lsm_secattr *secattr)
1285 {
1286         int ret_val;
1287         struct iphdr *hdr4;
1288 #if IS_ENABLED(CONFIG_IPV6)
1289         struct ipv6hdr *hdr6;
1290 #endif
1291         struct netlbl_dommap_def *entry;
1292 
1293         rcu_read_lock();
1294         switch (family) {
1295         case AF_INET:
1296                 hdr4 = ip_hdr(skb);
1297                 entry = netlbl_domhsh_getentry_af4(secattr->domain,
1298                                                    hdr4->daddr);
1299                 if (entry == NULL) {
1300                         ret_val = -ENOENT;
1301                         goto skbuff_setattr_return;
1302                 }
1303                 switch (entry->type) {
1304                 case NETLBL_NLTYPE_CIPSOV4:
1305                         ret_val = cipso_v4_skbuff_setattr(skb, entry->cipso,
1306                                                           secattr);
1307                         break;
1308                 case NETLBL_NLTYPE_UNLABELED:
1309                         /* just delete the protocols we support for right now
1310                          * but we could remove other protocols if needed */
1311                         ret_val = cipso_v4_skbuff_delattr(skb);
1312                         break;
1313                 default:
1314                         ret_val = -ENOENT;
1315                 }
1316                 break;
1317 #if IS_ENABLED(CONFIG_IPV6)
1318         case AF_INET6:
1319                 hdr6 = ipv6_hdr(skb);
1320                 entry = netlbl_domhsh_getentry_af6(secattr->domain,
1321                                                    &hdr6->daddr);
1322                 if (entry == NULL) {
1323                         ret_val = -ENOENT;
1324                         goto skbuff_setattr_return;
1325                 }
1326                 switch (entry->type) {
1327                 case NETLBL_NLTYPE_CALIPSO:
1328                         ret_val = calipso_skbuff_setattr(skb, entry->calipso,
1329                                                          secattr);
1330                         break;
1331                 case NETLBL_NLTYPE_UNLABELED:
1332                         /* just delete the protocols we support for right now
1333                          * but we could remove other protocols if needed */
1334                         ret_val = calipso_skbuff_delattr(skb);
1335                         break;
1336                 default:
1337                         ret_val = -ENOENT;
1338                 }
1339                 break;
1340 #endif /* IPv6 */
1341         default:
1342                 ret_val = -EPROTONOSUPPORT;
1343         }
1344 
1345 skbuff_setattr_return:
1346         rcu_read_unlock();
1347         return ret_val;
1348 }
1349 
1350 /**
1351  * netlbl_skbuff_getattr - Determine the security attributes of a packet
1352  * @skb: the packet
1353  * @family: protocol family
1354  * @secattr: the security attributes
1355  *
1356  * Description:
1357  * Examines the given packet to see if a recognized form of packet labeling
1358  * is present, if so it parses the packet label and returns the security
1359  * attributes in @secattr.  Returns zero on success, negative values on
1360  * failure.
1361  *
1362  */
1363 int netlbl_skbuff_getattr(const struct sk_buff *skb,
1364                           u16 family,
1365                           struct netlbl_lsm_secattr *secattr)
1366 {
1367         unsigned char *ptr;
1368 
1369         switch (family) {
1370         case AF_INET:
1371                 ptr = cipso_v4_optptr(skb);
1372                 if (ptr && cipso_v4_getattr(ptr, secattr) == 0)
1373                         return 0;
1374                 break;
1375 #if IS_ENABLED(CONFIG_IPV6)
1376         case AF_INET6:
1377                 ptr = calipso_optptr(skb);
1378                 if (ptr && calipso_getattr(ptr, secattr) == 0)
1379                         return 0;
1380                 break;
1381 #endif /* IPv6 */
1382         }
1383 
1384         return netlbl_unlabel_getattr(skb, family, secattr);
1385 }
1386 
1387 /**
1388  * netlbl_skbuff_err - Handle a LSM error on a sk_buff
1389  * @skb: the packet
1390  * @family: the family
1391  * @error: the error code
1392  * @gateway: true if host is acting as a gateway, false otherwise
1393  *
1394  * Description:
1395  * Deal with a LSM problem when handling the packet in @skb, typically this is
1396  * a permission denied problem (-EACCES).  The correct action is determined
1397  * according to the packet's labeling protocol.
1398  *
1399  */
1400 void netlbl_skbuff_err(struct sk_buff *skb, u16 family, int error, int gateway)
1401 {
1402         switch (family) {
1403         case AF_INET:
1404                 if (cipso_v4_optptr(skb))
1405                         cipso_v4_error(skb, error, gateway);
1406                 break;
1407         }
1408 }
1409 
1410 /**
1411  * netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches
1412  *
1413  * Description:
1414  * For all of the NetLabel protocols that support some form of label mapping
1415  * cache, invalidate the cache.  Returns zero on success, negative values on
1416  * error.
1417  *
1418  */
1419 void netlbl_cache_invalidate(void)
1420 {
1421         cipso_v4_cache_invalidate();
1422 #if IS_ENABLED(CONFIG_IPV6)
1423         calipso_cache_invalidate();
1424 #endif /* IPv6 */
1425 }
1426 
1427 /**
1428  * netlbl_cache_add - Add an entry to a NetLabel protocol cache
1429  * @skb: the packet
1430  * @family: the family
1431  * @secattr: the packet's security attributes
1432  *
1433  * Description:
1434  * Add the LSM security attributes for the given packet to the underlying
1435  * NetLabel protocol's label mapping cache.  Returns zero on success, negative
1436  * values on error.
1437  *
1438  */
1439 int netlbl_cache_add(const struct sk_buff *skb, u16 family,
1440                      const struct netlbl_lsm_secattr *secattr)
1441 {
1442         unsigned char *ptr;
1443 
1444         if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0)
1445                 return -ENOMSG;
1446 
1447         switch (family) {
1448         case AF_INET:
1449                 ptr = cipso_v4_optptr(skb);
1450                 if (ptr)
1451                         return cipso_v4_cache_add(ptr, secattr);
1452                 break;
1453 #if IS_ENABLED(CONFIG_IPV6)
1454         case AF_INET6:
1455                 ptr = calipso_optptr(skb);
1456                 if (ptr)
1457                         return calipso_cache_add(ptr, secattr);
1458                 break;
1459 #endif /* IPv6 */
1460         }
1461         return -ENOMSG;
1462 }
1463 
1464 /*
1465  * Protocol Engine Functions
1466  */
1467 
1468 /**
1469  * netlbl_audit_start - Start an audit message
1470  * @type: audit message type
1471  * @audit_info: NetLabel audit information
1472  *
1473  * Description:
1474  * Start an audit message using the type specified in @type and fill the audit
1475  * message with some fields common to all NetLabel audit messages.  This
1476  * function should only be used by protocol engines, not LSMs.  Returns a
1477  * pointer to the audit buffer on success, NULL on failure.
1478  *
1479  */
1480 struct audit_buffer *netlbl_audit_start(int type,
1481                                         struct netlbl_audit *audit_info)
1482 {
1483         return netlbl_audit_start_common(type, audit_info);
1484 }
1485 EXPORT_SYMBOL(netlbl_audit_start);
1486 
1487 /*
1488  * Setup Functions
1489  */
1490 
1491 /**
1492  * netlbl_init - Initialize NetLabel
1493  *
1494  * Description:
1495  * Perform the required NetLabel initialization before first use.
1496  *
1497  */
1498 static int __init netlbl_init(void)
1499 {
1500         int ret_val;
1501 
1502         printk(KERN_INFO "NetLabel: Initializing\n");
1503         printk(KERN_INFO "NetLabel:  domain hash size = %u\n",
1504                (1 << NETLBL_DOMHSH_BITSIZE));
1505         printk(KERN_INFO "NetLabel:  protocols = UNLABELED CIPSOv4 CALIPSO\n");
1506 
1507         ret_val = netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE);
1508         if (ret_val != 0)
1509                 goto init_failure;
1510 
1511         ret_val = netlbl_unlabel_init(NETLBL_UNLHSH_BITSIZE);
1512         if (ret_val != 0)
1513                 goto init_failure;
1514 
1515         ret_val = netlbl_netlink_init();
1516         if (ret_val != 0)
1517                 goto init_failure;
1518 
1519         ret_val = netlbl_unlabel_defconf();
1520         if (ret_val != 0)
1521                 goto init_failure;
1522         printk(KERN_INFO "NetLabel:  unlabeled traffic allowed by default\n");
1523 
1524         return 0;
1525 
1526 init_failure:
1527         panic("NetLabel: failed to initialize properly (%d)\n", ret_val);
1528 }
1529 
1530 subsys_initcall(netlbl_init);
1531 

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