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

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