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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                 if (++bit_spot >= bitmap_len)
907                         return -1;
908                 bitmask >>= 1;
909                 if (bitmask == 0) {
910                         byte = bitmap[++byte_offset];
911                         bitmask = 0x80;
912                 }
913         }
914 
915         return -1;
916 }
917 EXPORT_SYMBOL(netlbl_bitmap_walk);
918 
919 /**
920  * netlbl_bitmap_setbit - Sets a single bit in a bitmap
921  * @bitmap: the bitmap
922  * @bit: the bit
923  * @state: if non-zero, set the bit (1) else clear the bit (0)
924  *
925  * Description:
926  * Set a single bit in the bitmask.  Returns zero on success, negative values
927  * on error.
928  */
929 void netlbl_bitmap_setbit(unsigned char *bitmap, u32 bit, u8 state)
930 {
931         u32 byte_spot;
932         u8 bitmask;
933 
934         /* gcc always rounds to zero when doing integer division */
935         byte_spot = bit / 8;
936         bitmask = 0x80 >> (bit % 8);
937         if (state)
938                 bitmap[byte_spot] |= bitmask;
939         else
940                 bitmap[byte_spot] &= ~bitmask;
941 }
942 EXPORT_SYMBOL(netlbl_bitmap_setbit);
943 
944 /*
945  * LSM Functions
946  */
947 
948 /**
949  * netlbl_enabled - Determine if the NetLabel subsystem is enabled
950  *
951  * Description:
952  * The LSM can use this function to determine if it should use NetLabel
953  * security attributes in it's enforcement mechanism.  Currently, NetLabel is
954  * considered to be enabled when it's configuration contains a valid setup for
955  * at least one labeled protocol (i.e. NetLabel can understand incoming
956  * labeled packets of at least one type); otherwise NetLabel is considered to
957  * be disabled.
958  *
959  */
960 int netlbl_enabled(void)
961 {
962         /* At some point we probably want to expose this mechanism to the user
963          * as well so that admins can toggle NetLabel regardless of the
964          * configuration */
965         return (atomic_read(&netlabel_mgmt_protocount) > 0);
966 }
967 
968 /**
969  * netlbl_sock_setattr - Label a socket using the correct protocol
970  * @sk: the socket to label
971  * @family: protocol family
972  * @secattr: the security attributes
973  *
974  * Description:
975  * Attach the correct label to the given socket using the security attributes
976  * specified in @secattr.  This function requires exclusive access to @sk,
977  * which means it either needs to be in the process of being created or locked.
978  * Returns zero on success, -EDESTADDRREQ if the domain is configured to use
979  * network address selectors (can't blindly label the socket), and negative
980  * values on all other failures.
981  *
982  */
983 int netlbl_sock_setattr(struct sock *sk,
984                         u16 family,
985                         const struct netlbl_lsm_secattr *secattr)
986 {
987         int ret_val;
988         struct netlbl_dom_map *dom_entry;
989 
990         rcu_read_lock();
991         dom_entry = netlbl_domhsh_getentry(secattr->domain, family);
992         if (dom_entry == NULL) {
993                 ret_val = -ENOENT;
994                 goto socket_setattr_return;
995         }
996         switch (family) {
997         case AF_INET:
998                 switch (dom_entry->def.type) {
999                 case NETLBL_NLTYPE_ADDRSELECT:
1000                         ret_val = -EDESTADDRREQ;
1001                         break;
1002                 case NETLBL_NLTYPE_CIPSOV4:
1003                         ret_val = cipso_v4_sock_setattr(sk,
1004                                                         dom_entry->def.cipso,
1005                                                         secattr);
1006                         break;
1007                 case NETLBL_NLTYPE_UNLABELED:
1008                         ret_val = 0;
1009                         break;
1010                 default:
1011                         ret_val = -ENOENT;
1012                 }
1013                 break;
1014 #if IS_ENABLED(CONFIG_IPV6)
1015         case AF_INET6:
1016                 switch (dom_entry->def.type) {
1017                 case NETLBL_NLTYPE_ADDRSELECT:
1018                         ret_val = -EDESTADDRREQ;
1019                         break;
1020                 case NETLBL_NLTYPE_CALIPSO:
1021                         ret_val = calipso_sock_setattr(sk,
1022                                                        dom_entry->def.calipso,
1023                                                        secattr);
1024                         break;
1025                 case NETLBL_NLTYPE_UNLABELED:
1026                         ret_val = 0;
1027                         break;
1028                 default:
1029                         ret_val = -ENOENT;
1030                 }
1031                 break;
1032 #endif /* IPv6 */
1033         default:
1034                 ret_val = -EPROTONOSUPPORT;
1035         }
1036 
1037 socket_setattr_return:
1038         rcu_read_unlock();
1039         return ret_val;
1040 }
1041 
1042 /**
1043  * netlbl_sock_delattr - Delete all the NetLabel labels on a socket
1044  * @sk: the socket
1045  *
1046  * Description:
1047  * Remove all the NetLabel labeling from @sk.  The caller is responsible for
1048  * ensuring that @sk is locked.
1049  *
1050  */
1051 void netlbl_sock_delattr(struct sock *sk)
1052 {
1053         switch (sk->sk_family) {
1054         case AF_INET:
1055                 cipso_v4_sock_delattr(sk);
1056                 break;
1057 #if IS_ENABLED(CONFIG_IPV6)
1058         case AF_INET6:
1059                 calipso_sock_delattr(sk);
1060                 break;
1061 #endif /* IPv6 */
1062         }
1063 }
1064 
1065 /**
1066  * netlbl_sock_getattr - Determine the security attributes of a sock
1067  * @sk: the sock
1068  * @secattr: the security attributes
1069  *
1070  * Description:
1071  * Examines the given sock to see if any NetLabel style labeling has been
1072  * applied to the sock, if so it parses the socket label and returns the
1073  * security attributes in @secattr.  Returns zero on success, negative values
1074  * on failure.
1075  *
1076  */
1077 int netlbl_sock_getattr(struct sock *sk,
1078                         struct netlbl_lsm_secattr *secattr)
1079 {
1080         int ret_val;
1081 
1082         switch (sk->sk_family) {
1083         case AF_INET:
1084                 ret_val = cipso_v4_sock_getattr(sk, secattr);
1085                 break;
1086 #if IS_ENABLED(CONFIG_IPV6)
1087         case AF_INET6:
1088                 ret_val = calipso_sock_getattr(sk, secattr);
1089                 break;
1090 #endif /* IPv6 */
1091         default:
1092                 ret_val = -EPROTONOSUPPORT;
1093         }
1094 
1095         return ret_val;
1096 }
1097 
1098 /**
1099  * netlbl_conn_setattr - Label a connected socket using the correct protocol
1100  * @sk: the socket to label
1101  * @addr: the destination address
1102  * @secattr: the security attributes
1103  *
1104  * Description:
1105  * Attach the correct label to the given connected socket using the security
1106  * attributes specified in @secattr.  The caller is responsible for ensuring
1107  * that @sk is locked.  Returns zero on success, negative values on failure.
1108  *
1109  */
1110 int netlbl_conn_setattr(struct sock *sk,
1111                         struct sockaddr *addr,
1112                         const struct netlbl_lsm_secattr *secattr)
1113 {
1114         int ret_val;
1115         struct sockaddr_in *addr4;
1116 #if IS_ENABLED(CONFIG_IPV6)
1117         struct sockaddr_in6 *addr6;
1118 #endif
1119         struct netlbl_dommap_def *entry;
1120 
1121         rcu_read_lock();
1122         switch (addr->sa_family) {
1123         case AF_INET:
1124                 addr4 = (struct sockaddr_in *)addr;
1125                 entry = netlbl_domhsh_getentry_af4(secattr->domain,
1126                                                    addr4->sin_addr.s_addr);
1127                 if (entry == NULL) {
1128                         ret_val = -ENOENT;
1129                         goto conn_setattr_return;
1130                 }
1131                 switch (entry->type) {
1132                 case NETLBL_NLTYPE_CIPSOV4:
1133                         ret_val = cipso_v4_sock_setattr(sk,
1134                                                         entry->cipso, secattr);
1135                         break;
1136                 case NETLBL_NLTYPE_UNLABELED:
1137                         /* just delete the protocols we support for right now
1138                          * but we could remove other protocols if needed */
1139                         netlbl_sock_delattr(sk);
1140                         ret_val = 0;
1141                         break;
1142                 default:
1143                         ret_val = -ENOENT;
1144                 }
1145                 break;
1146 #if IS_ENABLED(CONFIG_IPV6)
1147         case AF_INET6:
1148                 addr6 = (struct sockaddr_in6 *)addr;
1149                 entry = netlbl_domhsh_getentry_af6(secattr->domain,
1150                                                    &addr6->sin6_addr);
1151                 if (entry == NULL) {
1152                         ret_val = -ENOENT;
1153                         goto conn_setattr_return;
1154                 }
1155                 switch (entry->type) {
1156                 case NETLBL_NLTYPE_CALIPSO:
1157                         ret_val = calipso_sock_setattr(sk,
1158                                                        entry->calipso, secattr);
1159                         break;
1160                 case NETLBL_NLTYPE_UNLABELED:
1161                         /* just delete the protocols we support for right now
1162                          * but we could remove other protocols if needed */
1163                         netlbl_sock_delattr(sk);
1164                         ret_val = 0;
1165                         break;
1166                 default:
1167                         ret_val = -ENOENT;
1168                 }
1169                 break;
1170 #endif /* IPv6 */
1171         default:
1172                 ret_val = -EPROTONOSUPPORT;
1173         }
1174 
1175 conn_setattr_return:
1176         rcu_read_unlock();
1177         return ret_val;
1178 }
1179 
1180 /**
1181  * netlbl_req_setattr - Label a request socket using the correct protocol
1182  * @req: the request socket to label
1183  * @secattr: the security attributes
1184  *
1185  * Description:
1186  * Attach the correct label to the given socket using the security attributes
1187  * specified in @secattr.  Returns zero on success, negative values on failure.
1188  *
1189  */
1190 int netlbl_req_setattr(struct request_sock *req,
1191                        const struct netlbl_lsm_secattr *secattr)
1192 {
1193         int ret_val;
1194         struct netlbl_dommap_def *entry;
1195         struct inet_request_sock *ireq = inet_rsk(req);
1196 
1197         rcu_read_lock();
1198         switch (req->rsk_ops->family) {
1199         case AF_INET:
1200                 entry = netlbl_domhsh_getentry_af4(secattr->domain,
1201                                                    ireq->ir_rmt_addr);
1202                 if (entry == NULL) {
1203                         ret_val = -ENOENT;
1204                         goto req_setattr_return;
1205                 }
1206                 switch (entry->type) {
1207                 case NETLBL_NLTYPE_CIPSOV4:
1208                         ret_val = cipso_v4_req_setattr(req,
1209                                                        entry->cipso, secattr);
1210                         break;
1211                 case NETLBL_NLTYPE_UNLABELED:
1212                         netlbl_req_delattr(req);
1213                         ret_val = 0;
1214                         break;
1215                 default:
1216                         ret_val = -ENOENT;
1217                 }
1218                 break;
1219 #if IS_ENABLED(CONFIG_IPV6)
1220         case AF_INET6:
1221                 entry = netlbl_domhsh_getentry_af6(secattr->domain,
1222                                                    &ireq->ir_v6_rmt_addr);
1223                 if (entry == NULL) {
1224                         ret_val = -ENOENT;
1225                         goto req_setattr_return;
1226                 }
1227                 switch (entry->type) {
1228                 case NETLBL_NLTYPE_CALIPSO:
1229                         ret_val = calipso_req_setattr(req,
1230                                                       entry->calipso, secattr);
1231                         break;
1232                 case NETLBL_NLTYPE_UNLABELED:
1233                         netlbl_req_delattr(req);
1234                         ret_val = 0;
1235                         break;
1236                 default:
1237                         ret_val = -ENOENT;
1238                 }
1239                 break;
1240 #endif /* IPv6 */
1241         default:
1242                 ret_val = -EPROTONOSUPPORT;
1243         }
1244 
1245 req_setattr_return:
1246         rcu_read_unlock();
1247         return ret_val;
1248 }
1249 
1250 /**
1251 * netlbl_req_delattr - Delete all the NetLabel labels on a socket
1252 * @req: the socket
1253 *
1254 * Description:
1255 * Remove all the NetLabel labeling from @req.
1256 *
1257 */
1258 void netlbl_req_delattr(struct request_sock *req)
1259 {
1260         switch (req->rsk_ops->family) {
1261         case AF_INET:
1262                 cipso_v4_req_delattr(req);
1263                 break;
1264 #if IS_ENABLED(CONFIG_IPV6)
1265         case AF_INET6:
1266                 calipso_req_delattr(req);
1267                 break;
1268 #endif /* IPv6 */
1269         }
1270 }
1271 
1272 /**
1273  * netlbl_skbuff_setattr - Label a packet using the correct protocol
1274  * @skb: the packet
1275  * @family: protocol family
1276  * @secattr: the security attributes
1277  *
1278  * Description:
1279  * Attach the correct label to the given packet using the security attributes
1280  * specified in @secattr.  Returns zero on success, negative values on failure.
1281  *
1282  */
1283 int netlbl_skbuff_setattr(struct sk_buff *skb,
1284                           u16 family,
1285                           const struct netlbl_lsm_secattr *secattr)
1286 {
1287         int ret_val;
1288         struct iphdr *hdr4;
1289 #if IS_ENABLED(CONFIG_IPV6)
1290         struct ipv6hdr *hdr6;
1291 #endif
1292         struct netlbl_dommap_def *entry;
1293 
1294         rcu_read_lock();
1295         switch (family) {
1296         case AF_INET:
1297                 hdr4 = ip_hdr(skb);
1298                 entry = netlbl_domhsh_getentry_af4(secattr->domain,
1299                                                    hdr4->daddr);
1300                 if (entry == NULL) {
1301                         ret_val = -ENOENT;
1302                         goto skbuff_setattr_return;
1303                 }
1304                 switch (entry->type) {
1305                 case NETLBL_NLTYPE_CIPSOV4:
1306                         ret_val = cipso_v4_skbuff_setattr(skb, entry->cipso,
1307                                                           secattr);
1308                         break;
1309                 case NETLBL_NLTYPE_UNLABELED:
1310                         /* just delete the protocols we support for right now
1311                          * but we could remove other protocols if needed */
1312                         ret_val = cipso_v4_skbuff_delattr(skb);
1313                         break;
1314                 default:
1315                         ret_val = -ENOENT;
1316                 }
1317                 break;
1318 #if IS_ENABLED(CONFIG_IPV6)
1319         case AF_INET6:
1320                 hdr6 = ipv6_hdr(skb);
1321                 entry = netlbl_domhsh_getentry_af6(secattr->domain,
1322                                                    &hdr6->daddr);
1323                 if (entry == NULL) {
1324                         ret_val = -ENOENT;
1325                         goto skbuff_setattr_return;
1326                 }
1327                 switch (entry->type) {
1328                 case NETLBL_NLTYPE_CALIPSO:
1329                         ret_val = calipso_skbuff_setattr(skb, entry->calipso,
1330                                                          secattr);
1331                         break;
1332                 case NETLBL_NLTYPE_UNLABELED:
1333                         /* just delete the protocols we support for right now
1334                          * but we could remove other protocols if needed */
1335                         ret_val = calipso_skbuff_delattr(skb);
1336                         break;
1337                 default:
1338                         ret_val = -ENOENT;
1339                 }
1340                 break;
1341 #endif /* IPv6 */
1342         default:
1343                 ret_val = -EPROTONOSUPPORT;
1344         }
1345 
1346 skbuff_setattr_return:
1347         rcu_read_unlock();
1348         return ret_val;
1349 }
1350 
1351 /**
1352  * netlbl_skbuff_getattr - Determine the security attributes of a packet
1353  * @skb: the packet
1354  * @family: protocol family
1355  * @secattr: the security attributes
1356  *
1357  * Description:
1358  * Examines the given packet to see if a recognized form of packet labeling
1359  * is present, if so it parses the packet label and returns the security
1360  * attributes in @secattr.  Returns zero on success, negative values on
1361  * failure.
1362  *
1363  */
1364 int netlbl_skbuff_getattr(const struct sk_buff *skb,
1365                           u16 family,
1366                           struct netlbl_lsm_secattr *secattr)
1367 {
1368         unsigned char *ptr;
1369 
1370         switch (family) {
1371         case AF_INET:
1372                 ptr = cipso_v4_optptr(skb);
1373                 if (ptr && cipso_v4_getattr(ptr, secattr) == 0)
1374                         return 0;
1375                 break;
1376 #if IS_ENABLED(CONFIG_IPV6)
1377         case AF_INET6:
1378                 ptr = calipso_optptr(skb);
1379                 if (ptr && calipso_getattr(ptr, secattr) == 0)
1380                         return 0;
1381                 break;
1382 #endif /* IPv6 */
1383         }
1384 
1385         return netlbl_unlabel_getattr(skb, family, secattr);
1386 }
1387 
1388 /**
1389  * netlbl_skbuff_err - Handle a LSM error on a sk_buff
1390  * @skb: the packet
1391  * @family: the family
1392  * @error: the error code
1393  * @gateway: true if host is acting as a gateway, false otherwise
1394  *
1395  * Description:
1396  * Deal with a LSM problem when handling the packet in @skb, typically this is
1397  * a permission denied problem (-EACCES).  The correct action is determined
1398  * according to the packet's labeling protocol.
1399  *
1400  */
1401 void netlbl_skbuff_err(struct sk_buff *skb, u16 family, int error, int gateway)
1402 {
1403         switch (family) {
1404         case AF_INET:
1405                 if (cipso_v4_optptr(skb))
1406                         cipso_v4_error(skb, error, gateway);
1407                 break;
1408         }
1409 }
1410 
1411 /**
1412  * netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches
1413  *
1414  * Description:
1415  * For all of the NetLabel protocols that support some form of label mapping
1416  * cache, invalidate the cache.  Returns zero on success, negative values on
1417  * error.
1418  *
1419  */
1420 void netlbl_cache_invalidate(void)
1421 {
1422         cipso_v4_cache_invalidate();
1423 #if IS_ENABLED(CONFIG_IPV6)
1424         calipso_cache_invalidate();
1425 #endif /* IPv6 */
1426 }
1427 
1428 /**
1429  * netlbl_cache_add - Add an entry to a NetLabel protocol cache
1430  * @skb: the packet
1431  * @family: the family
1432  * @secattr: the packet's security attributes
1433  *
1434  * Description:
1435  * Add the LSM security attributes for the given packet to the underlying
1436  * NetLabel protocol's label mapping cache.  Returns zero on success, negative
1437  * values on error.
1438  *
1439  */
1440 int netlbl_cache_add(const struct sk_buff *skb, u16 family,
1441                      const struct netlbl_lsm_secattr *secattr)
1442 {
1443         unsigned char *ptr;
1444 
1445         if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0)
1446                 return -ENOMSG;
1447 
1448         switch (family) {
1449         case AF_INET:
1450                 ptr = cipso_v4_optptr(skb);
1451                 if (ptr)
1452                         return cipso_v4_cache_add(ptr, secattr);
1453                 break;
1454 #if IS_ENABLED(CONFIG_IPV6)
1455         case AF_INET6:
1456                 ptr = calipso_optptr(skb);
1457                 if (ptr)
1458                         return calipso_cache_add(ptr, secattr);
1459                 break;
1460 #endif /* IPv6 */
1461         }
1462         return -ENOMSG;
1463 }
1464 
1465 /*
1466  * Protocol Engine Functions
1467  */
1468 
1469 /**
1470  * netlbl_audit_start - Start an audit message
1471  * @type: audit message type
1472  * @audit_info: NetLabel audit information
1473  *
1474  * Description:
1475  * Start an audit message using the type specified in @type and fill the audit
1476  * message with some fields common to all NetLabel audit messages.  This
1477  * function should only be used by protocol engines, not LSMs.  Returns a
1478  * pointer to the audit buffer on success, NULL on failure.
1479  *
1480  */
1481 struct audit_buffer *netlbl_audit_start(int type,
1482                                         struct netlbl_audit *audit_info)
1483 {
1484         return netlbl_audit_start_common(type, audit_info);
1485 }
1486 EXPORT_SYMBOL(netlbl_audit_start);
1487 
1488 /*
1489  * Setup Functions
1490  */
1491 
1492 /**
1493  * netlbl_init - Initialize NetLabel
1494  *
1495  * Description:
1496  * Perform the required NetLabel initialization before first use.
1497  *
1498  */
1499 static int __init netlbl_init(void)
1500 {
1501         int ret_val;
1502 
1503         printk(KERN_INFO "NetLabel: Initializing\n");
1504         printk(KERN_INFO "NetLabel:  domain hash size = %u\n",
1505                (1 << NETLBL_DOMHSH_BITSIZE));
1506         printk(KERN_INFO "NetLabel:  protocols = UNLABELED CIPSOv4 CALIPSO\n");
1507 
1508         ret_val = netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE);
1509         if (ret_val != 0)
1510                 goto init_failure;
1511 
1512         ret_val = netlbl_unlabel_init(NETLBL_UNLHSH_BITSIZE);
1513         if (ret_val != 0)
1514                 goto init_failure;
1515 
1516         ret_val = netlbl_netlink_init();
1517         if (ret_val != 0)
1518                 goto init_failure;
1519 
1520         ret_val = netlbl_unlabel_defconf();
1521         if (ret_val != 0)
1522                 goto init_failure;
1523         printk(KERN_INFO "NetLabel:  unlabeled traffic allowed by default\n");
1524 
1525         return 0;
1526 
1527 init_failure:
1528         panic("NetLabel: failed to initialize properly (%d)\n", ret_val);
1529 }
1530 
1531 subsys_initcall(netlbl_init);
1532 

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