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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 <asm/bug.h>
 41 #include <linux/atomic.h>
 42 
 43 #include "netlabel_domainhash.h"
 44 #include "netlabel_unlabeled.h"
 45 #include "netlabel_cipso_v4.h"
 46 #include "netlabel_user.h"
 47 #include "netlabel_mgmt.h"
 48 #include "netlabel_addrlist.h"
 49 
 50 /*
 51  * Configuration Functions
 52  */
 53 
 54 /**
 55  * netlbl_cfg_map_del - Remove a NetLabel/LSM domain mapping
 56  * @domain: the domain mapping to remove
 57  * @family: address family
 58  * @addr: IP address
 59  * @mask: IP address mask
 60  * @audit_info: NetLabel audit information
 61  *
 62  * Description:
 63  * Removes a NetLabel/LSM domain mapping.  A @domain value of NULL causes the
 64  * default domain mapping to be removed.  Returns zero on success, negative
 65  * values on failure.
 66  *
 67  */
 68 int netlbl_cfg_map_del(const char *domain,
 69                        u16 family,
 70                        const void *addr,
 71                        const void *mask,
 72                        struct netlbl_audit *audit_info)
 73 {
 74         if (addr == NULL && mask == NULL) {
 75                 return netlbl_domhsh_remove(domain, audit_info);
 76         } else if (addr != NULL && mask != NULL) {
 77                 switch (family) {
 78                 case AF_INET:
 79                         return netlbl_domhsh_remove_af4(domain, addr, mask,
 80                                                         audit_info);
 81                 default:
 82                         return -EPFNOSUPPORT;
 83                 }
 84         } else
 85                 return -EINVAL;
 86 }
 87 
 88 /**
 89  * netlbl_cfg_unlbl_map_add - Add a new unlabeled mapping
 90  * @domain: the domain mapping to add
 91  * @family: address family
 92  * @addr: IP address
 93  * @mask: IP address mask
 94  * @audit_info: NetLabel audit information
 95  *
 96  * Description:
 97  * Adds a new unlabeled NetLabel/LSM domain mapping.  A @domain value of NULL
 98  * causes a new default domain mapping to be added.  Returns zero on success,
 99  * negative values on failure.
100  *
101  */
102 int netlbl_cfg_unlbl_map_add(const char *domain,
103                              u16 family,
104                              const void *addr,
105                              const void *mask,
106                              struct netlbl_audit *audit_info)
107 {
108         int ret_val = -ENOMEM;
109         struct netlbl_dom_map *entry;
110         struct netlbl_domaddr_map *addrmap = NULL;
111         struct netlbl_domaddr4_map *map4 = NULL;
112         struct netlbl_domaddr6_map *map6 = NULL;
113 
114         entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
115         if (entry == NULL)
116                 return -ENOMEM;
117         if (domain != NULL) {
118                 entry->domain = kstrdup(domain, GFP_ATOMIC);
119                 if (entry->domain == NULL)
120                         goto cfg_unlbl_map_add_failure;
121         }
122 
123         if (addr == NULL && mask == NULL)
124                 entry->def.type = NETLBL_NLTYPE_UNLABELED;
125         else if (addr != NULL && mask != NULL) {
126                 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
127                 if (addrmap == NULL)
128                         goto cfg_unlbl_map_add_failure;
129                 INIT_LIST_HEAD(&addrmap->list4);
130                 INIT_LIST_HEAD(&addrmap->list6);
131 
132                 switch (family) {
133                 case AF_INET: {
134                         const struct in_addr *addr4 = addr;
135                         const struct in_addr *mask4 = mask;
136                         map4 = kzalloc(sizeof(*map4), GFP_ATOMIC);
137                         if (map4 == NULL)
138                                 goto cfg_unlbl_map_add_failure;
139                         map4->def.type = NETLBL_NLTYPE_UNLABELED;
140                         map4->list.addr = addr4->s_addr & mask4->s_addr;
141                         map4->list.mask = mask4->s_addr;
142                         map4->list.valid = 1;
143                         ret_val = netlbl_af4list_add(&map4->list,
144                                                      &addrmap->list4);
145                         if (ret_val != 0)
146                                 goto cfg_unlbl_map_add_failure;
147                         break;
148                         }
149 #if IS_ENABLED(CONFIG_IPV6)
150                 case AF_INET6: {
151                         const struct in6_addr *addr6 = addr;
152                         const struct in6_addr *mask6 = mask;
153                         map6 = kzalloc(sizeof(*map6), GFP_ATOMIC);
154                         if (map6 == NULL)
155                                 goto cfg_unlbl_map_add_failure;
156                         map6->def.type = NETLBL_NLTYPE_UNLABELED;
157                         map6->list.addr = *addr6;
158                         map6->list.addr.s6_addr32[0] &= mask6->s6_addr32[0];
159                         map6->list.addr.s6_addr32[1] &= mask6->s6_addr32[1];
160                         map6->list.addr.s6_addr32[2] &= mask6->s6_addr32[2];
161                         map6->list.addr.s6_addr32[3] &= mask6->s6_addr32[3];
162                         map6->list.mask = *mask6;
163                         map6->list.valid = 1;
164                         ret_val = netlbl_af6list_add(&map6->list,
165                                                      &addrmap->list6);
166                         if (ret_val != 0)
167                                 goto cfg_unlbl_map_add_failure;
168                         break;
169                         }
170 #endif /* IPv6 */
171                 default:
172                         goto cfg_unlbl_map_add_failure;
173                 }
174 
175                 entry->def.addrsel = addrmap;
176                 entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
177         } else {
178                 ret_val = -EINVAL;
179                 goto cfg_unlbl_map_add_failure;
180         }
181 
182         ret_val = netlbl_domhsh_add(entry, audit_info);
183         if (ret_val != 0)
184                 goto cfg_unlbl_map_add_failure;
185 
186         return 0;
187 
188 cfg_unlbl_map_add_failure:
189         kfree(entry->domain);
190         kfree(entry);
191         kfree(addrmap);
192         kfree(map4);
193         kfree(map6);
194         return ret_val;
195 }
196 
197 
198 /**
199  * netlbl_cfg_unlbl_static_add - Adds a new static label
200  * @net: network namespace
201  * @dev_name: interface name
202  * @addr: IP address in network byte order (struct in[6]_addr)
203  * @mask: address mask in network byte order (struct in[6]_addr)
204  * @family: address family
205  * @secid: LSM secid value for the entry
206  * @audit_info: NetLabel audit information
207  *
208  * Description:
209  * Adds a new NetLabel static label to be used when protocol provided labels
210  * are not present on incoming traffic.  If @dev_name is NULL then the default
211  * interface will be used.  Returns zero on success, negative values on failure.
212  *
213  */
214 int netlbl_cfg_unlbl_static_add(struct net *net,
215                                 const char *dev_name,
216                                 const void *addr,
217                                 const void *mask,
218                                 u16 family,
219                                 u32 secid,
220                                 struct netlbl_audit *audit_info)
221 {
222         u32 addr_len;
223 
224         switch (family) {
225         case AF_INET:
226                 addr_len = sizeof(struct in_addr);
227                 break;
228 #if IS_ENABLED(CONFIG_IPV6)
229         case AF_INET6:
230                 addr_len = sizeof(struct in6_addr);
231                 break;
232 #endif /* IPv6 */
233         default:
234                 return -EPFNOSUPPORT;
235         }
236 
237         return netlbl_unlhsh_add(net,
238                                  dev_name, addr, mask, addr_len,
239                                  secid, audit_info);
240 }
241 
242 /**
243  * netlbl_cfg_unlbl_static_del - Removes an existing static label
244  * @net: network namespace
245  * @dev_name: interface name
246  * @addr: IP address in network byte order (struct in[6]_addr)
247  * @mask: address mask in network byte order (struct in[6]_addr)
248  * @family: address family
249  * @audit_info: NetLabel audit information
250  *
251  * Description:
252  * Removes an existing NetLabel static label used when protocol provided labels
253  * are not present on incoming traffic.  If @dev_name is NULL then the default
254  * interface will be used.  Returns zero on success, negative values on failure.
255  *
256  */
257 int netlbl_cfg_unlbl_static_del(struct net *net,
258                                 const char *dev_name,
259                                 const void *addr,
260                                 const void *mask,
261                                 u16 family,
262                                 struct netlbl_audit *audit_info)
263 {
264         u32 addr_len;
265 
266         switch (family) {
267         case AF_INET:
268                 addr_len = sizeof(struct in_addr);
269                 break;
270 #if IS_ENABLED(CONFIG_IPV6)
271         case AF_INET6:
272                 addr_len = sizeof(struct in6_addr);
273                 break;
274 #endif /* IPv6 */
275         default:
276                 return -EPFNOSUPPORT;
277         }
278 
279         return netlbl_unlhsh_remove(net,
280                                     dev_name, addr, mask, addr_len,
281                                     audit_info);
282 }
283 
284 /**
285  * netlbl_cfg_cipsov4_add - Add a new CIPSOv4 DOI definition
286  * @doi_def: CIPSO DOI definition
287  * @audit_info: NetLabel audit information
288  *
289  * Description:
290  * Add a new CIPSO DOI definition as defined by @doi_def.  Returns zero on
291  * success and negative values on failure.
292  *
293  */
294 int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def,
295                            struct netlbl_audit *audit_info)
296 {
297         return cipso_v4_doi_add(doi_def, audit_info);
298 }
299 
300 /**
301  * netlbl_cfg_cipsov4_del - Remove an existing CIPSOv4 DOI definition
302  * @doi: CIPSO DOI
303  * @audit_info: NetLabel audit information
304  *
305  * Description:
306  * Remove an existing CIPSO DOI definition matching @doi.  Returns zero on
307  * success and negative values on failure.
308  *
309  */
310 void netlbl_cfg_cipsov4_del(u32 doi, struct netlbl_audit *audit_info)
311 {
312         cipso_v4_doi_remove(doi, audit_info);
313 }
314 
315 /**
316  * netlbl_cfg_cipsov4_map_add - Add a new CIPSOv4 DOI mapping
317  * @doi: the CIPSO DOI
318  * @domain: the domain mapping to add
319  * @addr: IP address
320  * @mask: IP address mask
321  * @audit_info: NetLabel audit information
322  *
323  * Description:
324  * Add a new NetLabel/LSM domain mapping for the given CIPSO DOI to the NetLabel
325  * subsystem.  A @domain value of NULL adds a new default domain mapping.
326  * Returns zero on success, negative values on failure.
327  *
328  */
329 int netlbl_cfg_cipsov4_map_add(u32 doi,
330                                const char *domain,
331                                const struct in_addr *addr,
332                                const struct in_addr *mask,
333                                struct netlbl_audit *audit_info)
334 {
335         int ret_val = -ENOMEM;
336         struct cipso_v4_doi *doi_def;
337         struct netlbl_dom_map *entry;
338         struct netlbl_domaddr_map *addrmap = NULL;
339         struct netlbl_domaddr4_map *addrinfo = NULL;
340 
341         doi_def = cipso_v4_doi_getdef(doi);
342         if (doi_def == NULL)
343                 return -ENOENT;
344 
345         entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
346         if (entry == NULL)
347                 goto out_entry;
348         if (domain != NULL) {
349                 entry->domain = kstrdup(domain, GFP_ATOMIC);
350                 if (entry->domain == NULL)
351                         goto out_domain;
352         }
353 
354         if (addr == NULL && mask == NULL) {
355                 entry->def.cipso = doi_def;
356                 entry->def.type = NETLBL_NLTYPE_CIPSOV4;
357         } else if (addr != NULL && mask != NULL) {
358                 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
359                 if (addrmap == NULL)
360                         goto out_addrmap;
361                 INIT_LIST_HEAD(&addrmap->list4);
362                 INIT_LIST_HEAD(&addrmap->list6);
363 
364                 addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC);
365                 if (addrinfo == NULL)
366                         goto out_addrinfo;
367                 addrinfo->def.cipso = doi_def;
368                 addrinfo->def.type = NETLBL_NLTYPE_CIPSOV4;
369                 addrinfo->list.addr = addr->s_addr & mask->s_addr;
370                 addrinfo->list.mask = mask->s_addr;
371                 addrinfo->list.valid = 1;
372                 ret_val = netlbl_af4list_add(&addrinfo->list, &addrmap->list4);
373                 if (ret_val != 0)
374                         goto cfg_cipsov4_map_add_failure;
375 
376                 entry->def.addrsel = addrmap;
377                 entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
378         } else {
379                 ret_val = -EINVAL;
380                 goto out_addrmap;
381         }
382 
383         ret_val = netlbl_domhsh_add(entry, audit_info);
384         if (ret_val != 0)
385                 goto cfg_cipsov4_map_add_failure;
386 
387         return 0;
388 
389 cfg_cipsov4_map_add_failure:
390         kfree(addrinfo);
391 out_addrinfo:
392         kfree(addrmap);
393 out_addrmap:
394         kfree(entry->domain);
395 out_domain:
396         kfree(entry);
397 out_entry:
398         cipso_v4_doi_putdef(doi_def);
399         return ret_val;
400 }
401 
402 /*
403  * Security Attribute Functions
404  */
405 
406 #define _CM_F_NONE      0x00000000
407 #define _CM_F_ALLOC     0x00000001
408 #define _CM_F_WALK      0x00000002
409 
410 /**
411  * _netlbl_catmap_getnode - Get a individual node from a catmap
412  * @catmap: pointer to the category bitmap
413  * @offset: the requested offset
414  * @cm_flags: catmap flags, see _CM_F_*
415  * @gfp_flags: memory allocation flags
416  *
417  * Description:
418  * Iterate through the catmap looking for the node associated with @offset.
419  * If the _CM_F_ALLOC flag is set in @cm_flags and there is no associated node,
420  * one will be created and inserted into the catmap.  If the _CM_F_WALK flag is
421  * set in @cm_flags and there is no associated node, the next highest node will
422  * be returned.  Returns a pointer to the node on success, NULL on failure.
423  *
424  */
425 static struct netlbl_lsm_catmap *_netlbl_catmap_getnode(
426                                              struct netlbl_lsm_catmap **catmap,
427                                              u32 offset,
428                                              unsigned int cm_flags,
429                                              gfp_t gfp_flags)
430 {
431         struct netlbl_lsm_catmap *iter = *catmap;
432         struct netlbl_lsm_catmap *prev = NULL;
433 
434         if (iter == NULL)
435                 goto catmap_getnode_alloc;
436         if (offset < iter->startbit)
437                 goto catmap_getnode_walk;
438         while (iter && offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
439                 prev = iter;
440                 iter = iter->next;
441         }
442         if (iter == NULL || offset < iter->startbit)
443                 goto catmap_getnode_walk;
444 
445         return iter;
446 
447 catmap_getnode_walk:
448         if (cm_flags & _CM_F_WALK)
449                 return iter;
450 catmap_getnode_alloc:
451         if (!(cm_flags & _CM_F_ALLOC))
452                 return NULL;
453 
454         iter = netlbl_catmap_alloc(gfp_flags);
455         if (iter == NULL)
456                 return NULL;
457         iter->startbit = offset & ~(NETLBL_CATMAP_SIZE - 1);
458 
459         if (prev == NULL) {
460                 iter->next = *catmap;
461                 *catmap = iter;
462         } else {
463                 iter->next = prev->next;
464                 prev->next = iter;
465         }
466 
467         return iter;
468 }
469 
470 /**
471  * netlbl_catmap_walk - Walk a LSM secattr catmap looking for a bit
472  * @catmap: the category bitmap
473  * @offset: the offset to start searching at, in bits
474  *
475  * Description:
476  * This function walks a LSM secattr category bitmap starting at @offset and
477  * returns the spot of the first set bit or -ENOENT if no bits are set.
478  *
479  */
480 int netlbl_catmap_walk(struct netlbl_lsm_catmap *catmap, u32 offset)
481 {
482         struct netlbl_lsm_catmap *iter = catmap;
483         u32 idx;
484         u32 bit;
485         NETLBL_CATMAP_MAPTYPE bitmap;
486 
487         iter = _netlbl_catmap_getnode(&catmap, offset, _CM_F_WALK, 0);
488         if (iter == NULL)
489                 return -ENOENT;
490         if (offset > iter->startbit) {
491                 offset -= iter->startbit;
492                 idx = offset / NETLBL_CATMAP_MAPSIZE;
493                 bit = offset % NETLBL_CATMAP_MAPSIZE;
494         } else {
495                 idx = 0;
496                 bit = 0;
497         }
498         bitmap = iter->bitmap[idx] >> bit;
499 
500         for (;;) {
501                 if (bitmap != 0) {
502                         while ((bitmap & NETLBL_CATMAP_BIT) == 0) {
503                                 bitmap >>= 1;
504                                 bit++;
505                         }
506                         return iter->startbit +
507                                (NETLBL_CATMAP_MAPSIZE * idx) + bit;
508                 }
509                 if (++idx >= NETLBL_CATMAP_MAPCNT) {
510                         if (iter->next != NULL) {
511                                 iter = iter->next;
512                                 idx = 0;
513                         } else
514                                 return -ENOENT;
515                 }
516                 bitmap = iter->bitmap[idx];
517                 bit = 0;
518         }
519 
520         return -ENOENT;
521 }
522 
523 /**
524  * netlbl_catmap_walkrng - Find the end of a string of set bits
525  * @catmap: the category bitmap
526  * @offset: the offset to start searching at, in bits
527  *
528  * Description:
529  * This function walks a LSM secattr category bitmap starting at @offset and
530  * returns the spot of the first cleared bit or -ENOENT if the offset is past
531  * the end of the bitmap.
532  *
533  */
534 int netlbl_catmap_walkrng(struct netlbl_lsm_catmap *catmap, u32 offset)
535 {
536         struct netlbl_lsm_catmap *iter;
537         struct netlbl_lsm_catmap *prev = NULL;
538         u32 idx;
539         u32 bit;
540         NETLBL_CATMAP_MAPTYPE bitmask;
541         NETLBL_CATMAP_MAPTYPE bitmap;
542 
543         iter = _netlbl_catmap_getnode(&catmap, offset, _CM_F_WALK, 0);
544         if (iter == NULL)
545                 return -ENOENT;
546         if (offset > iter->startbit) {
547                 offset -= iter->startbit;
548                 idx = offset / NETLBL_CATMAP_MAPSIZE;
549                 bit = offset % NETLBL_CATMAP_MAPSIZE;
550         } else {
551                 idx = 0;
552                 bit = 0;
553         }
554         bitmask = NETLBL_CATMAP_BIT << bit;
555 
556         for (;;) {
557                 bitmap = iter->bitmap[idx];
558                 while (bitmask != 0 && (bitmap & bitmask) != 0) {
559                         bitmask <<= 1;
560                         bit++;
561                 }
562 
563                 if (prev && idx == 0 && bit == 0)
564                         return prev->startbit + NETLBL_CATMAP_SIZE - 1;
565                 else if (bitmask != 0)
566                         return iter->startbit +
567                                 (NETLBL_CATMAP_MAPSIZE * idx) + bit - 1;
568                 else if (++idx >= NETLBL_CATMAP_MAPCNT) {
569                         if (iter->next == NULL)
570                                 return iter->startbit + NETLBL_CATMAP_SIZE - 1;
571                         prev = iter;
572                         iter = iter->next;
573                         idx = 0;
574                 }
575                 bitmask = NETLBL_CATMAP_BIT;
576                 bit = 0;
577         }
578 
579         return -ENOENT;
580 }
581 
582 /**
583  * netlbl_catmap_getlong - Export an unsigned long bitmap
584  * @catmap: pointer to the category bitmap
585  * @offset: pointer to the requested offset
586  * @bitmap: the exported bitmap
587  *
588  * Description:
589  * Export a bitmap with an offset greater than or equal to @offset and return
590  * it in @bitmap.  The @offset must be aligned to an unsigned long and will be
591  * updated on return if different from what was requested; if the catmap is
592  * empty at the requested offset and beyond, the @offset is set to (u32)-1.
593  * Returns zero on sucess, negative values on failure.
594  *
595  */
596 int netlbl_catmap_getlong(struct netlbl_lsm_catmap *catmap,
597                           u32 *offset,
598                           unsigned long *bitmap)
599 {
600         struct netlbl_lsm_catmap *iter;
601         u32 off = *offset;
602         u32 idx;
603 
604         /* only allow aligned offsets */
605         if ((off & (BITS_PER_LONG - 1)) != 0)
606                 return -EINVAL;
607 
608         if (off < catmap->startbit) {
609                 off = catmap->startbit;
610                 *offset = off;
611         }
612         iter = _netlbl_catmap_getnode(&catmap, off, _CM_F_NONE, 0);
613         if (iter == NULL) {
614                 *offset = (u32)-1;
615                 return 0;
616         }
617 
618         if (off < iter->startbit) {
619                 off = iter->startbit;
620                 *offset = off;
621         } else
622                 off -= iter->startbit;
623 
624         idx = off / NETLBL_CATMAP_MAPSIZE;
625         *bitmap = iter->bitmap[idx] >> (off % NETLBL_CATMAP_SIZE);
626 
627         return 0;
628 }
629 
630 /**
631  * netlbl_catmap_setbit - Set a bit in a LSM secattr catmap
632  * @catmap: pointer to the category bitmap
633  * @bit: the bit to set
634  * @flags: memory allocation flags
635  *
636  * Description:
637  * Set the bit specified by @bit in @catmap.  Returns zero on success,
638  * negative values on failure.
639  *
640  */
641 int netlbl_catmap_setbit(struct netlbl_lsm_catmap **catmap,
642                          u32 bit,
643                          gfp_t flags)
644 {
645         struct netlbl_lsm_catmap *iter;
646         u32 idx;
647 
648         iter = _netlbl_catmap_getnode(catmap, bit, _CM_F_ALLOC, flags);
649         if (iter == NULL)
650                 return -ENOMEM;
651 
652         bit -= iter->startbit;
653         idx = bit / NETLBL_CATMAP_MAPSIZE;
654         iter->bitmap[idx] |= NETLBL_CATMAP_BIT << (bit % NETLBL_CATMAP_MAPSIZE);
655 
656         return 0;
657 }
658 
659 /**
660  * netlbl_catmap_setrng - Set a range of bits in a LSM secattr catmap
661  * @catmap: pointer to the category bitmap
662  * @start: the starting bit
663  * @end: the last bit in the string
664  * @flags: memory allocation flags
665  *
666  * Description:
667  * Set a range of bits, starting at @start and ending with @end.  Returns zero
668  * on success, negative values on failure.
669  *
670  */
671 int netlbl_catmap_setrng(struct netlbl_lsm_catmap **catmap,
672                          u32 start,
673                          u32 end,
674                          gfp_t flags)
675 {
676         int rc = 0;
677         u32 spot = start;
678 
679         while (rc == 0 && spot <= end) {
680                 if (((spot & (BITS_PER_LONG - 1)) != 0) &&
681                     ((end - spot) > BITS_PER_LONG)) {
682                         rc = netlbl_catmap_setlong(catmap,
683                                                    spot,
684                                                    (unsigned long)-1,
685                                                    flags);
686                         spot += BITS_PER_LONG;
687                 } else
688                         rc = netlbl_catmap_setbit(catmap, spot++, flags);
689         }
690 
691         return rc;
692 }
693 
694 /**
695  * netlbl_catmap_setlong - Import an unsigned long bitmap
696  * @catmap: pointer to the category bitmap
697  * @offset: offset to the start of the imported bitmap
698  * @bitmap: the bitmap to import
699  * @flags: memory allocation flags
700  *
701  * Description:
702  * Import the bitmap specified in @bitmap into @catmap, using the offset
703  * in @offset.  The offset must be aligned to an unsigned long.  Returns zero
704  * on success, negative values on failure.
705  *
706  */
707 int netlbl_catmap_setlong(struct netlbl_lsm_catmap **catmap,
708                           u32 offset,
709                           unsigned long bitmap,
710                           gfp_t flags)
711 {
712         struct netlbl_lsm_catmap *iter;
713         u32 idx;
714 
715         /* only allow aligned offsets */
716         if ((offset & (BITS_PER_LONG - 1)) != 0)
717                 return -EINVAL;
718 
719         iter = _netlbl_catmap_getnode(catmap, offset, _CM_F_ALLOC, flags);
720         if (iter == NULL)
721                 return -ENOMEM;
722 
723         offset -= iter->startbit;
724         idx = offset / NETLBL_CATMAP_MAPSIZE;
725         iter->bitmap[idx] |= bitmap << (offset % NETLBL_CATMAP_MAPSIZE);
726 
727         return 0;
728 }
729 
730 /*
731  * LSM Functions
732  */
733 
734 /**
735  * netlbl_enabled - Determine if the NetLabel subsystem is enabled
736  *
737  * Description:
738  * The LSM can use this function to determine if it should use NetLabel
739  * security attributes in it's enforcement mechanism.  Currently, NetLabel is
740  * considered to be enabled when it's configuration contains a valid setup for
741  * at least one labeled protocol (i.e. NetLabel can understand incoming
742  * labeled packets of at least one type); otherwise NetLabel is considered to
743  * be disabled.
744  *
745  */
746 int netlbl_enabled(void)
747 {
748         /* At some point we probably want to expose this mechanism to the user
749          * as well so that admins can toggle NetLabel regardless of the
750          * configuration */
751         return (atomic_read(&netlabel_mgmt_protocount) > 0);
752 }
753 
754 /**
755  * netlbl_sock_setattr - Label a socket using the correct protocol
756  * @sk: the socket to label
757  * @family: protocol family
758  * @secattr: the security attributes
759  *
760  * Description:
761  * Attach the correct label to the given socket using the security attributes
762  * specified in @secattr.  This function requires exclusive access to @sk,
763  * which means it either needs to be in the process of being created or locked.
764  * Returns zero on success, -EDESTADDRREQ if the domain is configured to use
765  * network address selectors (can't blindly label the socket), and negative
766  * values on all other failures.
767  *
768  */
769 int netlbl_sock_setattr(struct sock *sk,
770                         u16 family,
771                         const struct netlbl_lsm_secattr *secattr)
772 {
773         int ret_val;
774         struct netlbl_dom_map *dom_entry;
775 
776         rcu_read_lock();
777         dom_entry = netlbl_domhsh_getentry(secattr->domain);
778         if (dom_entry == NULL) {
779                 ret_val = -ENOENT;
780                 goto socket_setattr_return;
781         }
782         switch (family) {
783         case AF_INET:
784                 switch (dom_entry->def.type) {
785                 case NETLBL_NLTYPE_ADDRSELECT:
786                         ret_val = -EDESTADDRREQ;
787                         break;
788                 case NETLBL_NLTYPE_CIPSOV4:
789                         ret_val = cipso_v4_sock_setattr(sk,
790                                                         dom_entry->def.cipso,
791                                                         secattr);
792                         break;
793                 case NETLBL_NLTYPE_UNLABELED:
794                         ret_val = 0;
795                         break;
796                 default:
797                         ret_val = -ENOENT;
798                 }
799                 break;
800 #if IS_ENABLED(CONFIG_IPV6)
801         case AF_INET6:
802                 /* since we don't support any IPv6 labeling protocols right
803                  * now we can optimize everything away until we do */
804                 ret_val = 0;
805                 break;
806 #endif /* IPv6 */
807         default:
808                 ret_val = -EPROTONOSUPPORT;
809         }
810 
811 socket_setattr_return:
812         rcu_read_unlock();
813         return ret_val;
814 }
815 
816 /**
817  * netlbl_sock_delattr - Delete all the NetLabel labels on a socket
818  * @sk: the socket
819  *
820  * Description:
821  * Remove all the NetLabel labeling from @sk.  The caller is responsible for
822  * ensuring that @sk is locked.
823  *
824  */
825 void netlbl_sock_delattr(struct sock *sk)
826 {
827         cipso_v4_sock_delattr(sk);
828 }
829 
830 /**
831  * netlbl_sock_getattr - Determine the security attributes of a sock
832  * @sk: the sock
833  * @secattr: the security attributes
834  *
835  * Description:
836  * Examines the given sock to see if any NetLabel style labeling has been
837  * applied to the sock, if so it parses the socket label and returns the
838  * security attributes in @secattr.  Returns zero on success, negative values
839  * on failure.
840  *
841  */
842 int netlbl_sock_getattr(struct sock *sk,
843                         struct netlbl_lsm_secattr *secattr)
844 {
845         int ret_val;
846 
847         switch (sk->sk_family) {
848         case AF_INET:
849                 ret_val = cipso_v4_sock_getattr(sk, secattr);
850                 break;
851 #if IS_ENABLED(CONFIG_IPV6)
852         case AF_INET6:
853                 ret_val = -ENOMSG;
854                 break;
855 #endif /* IPv6 */
856         default:
857                 ret_val = -EPROTONOSUPPORT;
858         }
859 
860         return ret_val;
861 }
862 
863 /**
864  * netlbl_conn_setattr - Label a connected socket using the correct protocol
865  * @sk: the socket to label
866  * @addr: the destination address
867  * @secattr: the security attributes
868  *
869  * Description:
870  * Attach the correct label to the given connected socket using the security
871  * attributes specified in @secattr.  The caller is responsible for ensuring
872  * that @sk is locked.  Returns zero on success, negative values on failure.
873  *
874  */
875 int netlbl_conn_setattr(struct sock *sk,
876                         struct sockaddr *addr,
877                         const struct netlbl_lsm_secattr *secattr)
878 {
879         int ret_val;
880         struct sockaddr_in *addr4;
881         struct netlbl_dommap_def *entry;
882 
883         rcu_read_lock();
884         switch (addr->sa_family) {
885         case AF_INET:
886                 addr4 = (struct sockaddr_in *)addr;
887                 entry = netlbl_domhsh_getentry_af4(secattr->domain,
888                                                    addr4->sin_addr.s_addr);
889                 if (entry == NULL) {
890                         ret_val = -ENOENT;
891                         goto conn_setattr_return;
892                 }
893                 switch (entry->type) {
894                 case NETLBL_NLTYPE_CIPSOV4:
895                         ret_val = cipso_v4_sock_setattr(sk,
896                                                         entry->cipso, secattr);
897                         break;
898                 case NETLBL_NLTYPE_UNLABELED:
899                         /* just delete the protocols we support for right now
900                          * but we could remove other protocols if needed */
901                         cipso_v4_sock_delattr(sk);
902                         ret_val = 0;
903                         break;
904                 default:
905                         ret_val = -ENOENT;
906                 }
907                 break;
908 #if IS_ENABLED(CONFIG_IPV6)
909         case AF_INET6:
910                 /* since we don't support any IPv6 labeling protocols right
911                  * now we can optimize everything away until we do */
912                 ret_val = 0;
913                 break;
914 #endif /* IPv6 */
915         default:
916                 ret_val = -EPROTONOSUPPORT;
917         }
918 
919 conn_setattr_return:
920         rcu_read_unlock();
921         return ret_val;
922 }
923 
924 /**
925  * netlbl_req_setattr - Label a request socket using the correct protocol
926  * @req: the request socket to label
927  * @secattr: the security attributes
928  *
929  * Description:
930  * Attach the correct label to the given socket using the security attributes
931  * specified in @secattr.  Returns zero on success, negative values on failure.
932  *
933  */
934 int netlbl_req_setattr(struct request_sock *req,
935                        const struct netlbl_lsm_secattr *secattr)
936 {
937         int ret_val;
938         struct netlbl_dommap_def *entry;
939 
940         rcu_read_lock();
941         switch (req->rsk_ops->family) {
942         case AF_INET:
943                 entry = netlbl_domhsh_getentry_af4(secattr->domain,
944                                                    inet_rsk(req)->ir_rmt_addr);
945                 if (entry == NULL) {
946                         ret_val = -ENOENT;
947                         goto req_setattr_return;
948                 }
949                 switch (entry->type) {
950                 case NETLBL_NLTYPE_CIPSOV4:
951                         ret_val = cipso_v4_req_setattr(req,
952                                                        entry->cipso, secattr);
953                         break;
954                 case NETLBL_NLTYPE_UNLABELED:
955                         /* just delete the protocols we support for right now
956                          * but we could remove other protocols if needed */
957                         cipso_v4_req_delattr(req);
958                         ret_val = 0;
959                         break;
960                 default:
961                         ret_val = -ENOENT;
962                 }
963                 break;
964 #if IS_ENABLED(CONFIG_IPV6)
965         case AF_INET6:
966                 /* since we don't support any IPv6 labeling protocols right
967                  * now we can optimize everything away until we do */
968                 ret_val = 0;
969                 break;
970 #endif /* IPv6 */
971         default:
972                 ret_val = -EPROTONOSUPPORT;
973         }
974 
975 req_setattr_return:
976         rcu_read_unlock();
977         return ret_val;
978 }
979 
980 /**
981 * netlbl_req_delattr - Delete all the NetLabel labels on a socket
982 * @req: the socket
983 *
984 * Description:
985 * Remove all the NetLabel labeling from @req.
986 *
987 */
988 void netlbl_req_delattr(struct request_sock *req)
989 {
990         cipso_v4_req_delattr(req);
991 }
992 
993 /**
994  * netlbl_skbuff_setattr - Label a packet using the correct protocol
995  * @skb: the packet
996  * @family: protocol family
997  * @secattr: the security attributes
998  *
999  * Description:
1000  * Attach the correct label to the given packet using the security attributes
1001  * specified in @secattr.  Returns zero on success, negative values on failure.
1002  *
1003  */
1004 int netlbl_skbuff_setattr(struct sk_buff *skb,
1005                           u16 family,
1006                           const struct netlbl_lsm_secattr *secattr)
1007 {
1008         int ret_val;
1009         struct iphdr *hdr4;
1010         struct netlbl_dommap_def *entry;
1011 
1012         rcu_read_lock();
1013         switch (family) {
1014         case AF_INET:
1015                 hdr4 = ip_hdr(skb);
1016                 entry = netlbl_domhsh_getentry_af4(secattr->domain,hdr4->daddr);
1017                 if (entry == NULL) {
1018                         ret_val = -ENOENT;
1019                         goto skbuff_setattr_return;
1020                 }
1021                 switch (entry->type) {
1022                 case NETLBL_NLTYPE_CIPSOV4:
1023                         ret_val = cipso_v4_skbuff_setattr(skb, entry->cipso,
1024                                                           secattr);
1025                         break;
1026                 case NETLBL_NLTYPE_UNLABELED:
1027                         /* just delete the protocols we support for right now
1028                          * but we could remove other protocols if needed */
1029                         ret_val = cipso_v4_skbuff_delattr(skb);
1030                         break;
1031                 default:
1032                         ret_val = -ENOENT;
1033                 }
1034                 break;
1035 #if IS_ENABLED(CONFIG_IPV6)
1036         case AF_INET6:
1037                 /* since we don't support any IPv6 labeling protocols right
1038                  * now we can optimize everything away until we do */
1039                 ret_val = 0;
1040                 break;
1041 #endif /* IPv6 */
1042         default:
1043                 ret_val = -EPROTONOSUPPORT;
1044         }
1045 
1046 skbuff_setattr_return:
1047         rcu_read_unlock();
1048         return ret_val;
1049 }
1050 
1051 /**
1052  * netlbl_skbuff_getattr - Determine the security attributes of a packet
1053  * @skb: the packet
1054  * @family: protocol family
1055  * @secattr: the security attributes
1056  *
1057  * Description:
1058  * Examines the given packet to see if a recognized form of packet labeling
1059  * is present, if so it parses the packet label and returns the security
1060  * attributes in @secattr.  Returns zero on success, negative values on
1061  * failure.
1062  *
1063  */
1064 int netlbl_skbuff_getattr(const struct sk_buff *skb,
1065                           u16 family,
1066                           struct netlbl_lsm_secattr *secattr)
1067 {
1068         unsigned char *ptr;
1069 
1070         switch (family) {
1071         case AF_INET:
1072                 ptr = cipso_v4_optptr(skb);
1073                 if (ptr && cipso_v4_getattr(ptr, secattr) == 0)
1074                         return 0;
1075                 break;
1076 #if IS_ENABLED(CONFIG_IPV6)
1077         case AF_INET6:
1078                 break;
1079 #endif /* IPv6 */
1080         }
1081 
1082         return netlbl_unlabel_getattr(skb, family, secattr);
1083 }
1084 
1085 /**
1086  * netlbl_skbuff_err - Handle a LSM error on a sk_buff
1087  * @skb: the packet
1088  * @error: the error code
1089  * @gateway: true if host is acting as a gateway, false otherwise
1090  *
1091  * Description:
1092  * Deal with a LSM problem when handling the packet in @skb, typically this is
1093  * a permission denied problem (-EACCES).  The correct action is determined
1094  * according to the packet's labeling protocol.
1095  *
1096  */
1097 void netlbl_skbuff_err(struct sk_buff *skb, int error, int gateway)
1098 {
1099         if (cipso_v4_optptr(skb))
1100                 cipso_v4_error(skb, error, gateway);
1101 }
1102 
1103 /**
1104  * netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches
1105  *
1106  * Description:
1107  * For all of the NetLabel protocols that support some form of label mapping
1108  * cache, invalidate the cache.  Returns zero on success, negative values on
1109  * error.
1110  *
1111  */
1112 void netlbl_cache_invalidate(void)
1113 {
1114         cipso_v4_cache_invalidate();
1115 }
1116 
1117 /**
1118  * netlbl_cache_add - Add an entry to a NetLabel protocol cache
1119  * @skb: the packet
1120  * @secattr: the packet's security attributes
1121  *
1122  * Description:
1123  * Add the LSM security attributes for the given packet to the underlying
1124  * NetLabel protocol's label mapping cache.  Returns zero on success, negative
1125  * values on error.
1126  *
1127  */
1128 int netlbl_cache_add(const struct sk_buff *skb,
1129                      const struct netlbl_lsm_secattr *secattr)
1130 {
1131         unsigned char *ptr;
1132 
1133         if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0)
1134                 return -ENOMSG;
1135 
1136         ptr = cipso_v4_optptr(skb);
1137         if (ptr)
1138                 return cipso_v4_cache_add(ptr, secattr);
1139 
1140         return -ENOMSG;
1141 }
1142 
1143 /*
1144  * Protocol Engine Functions
1145  */
1146 
1147 /**
1148  * netlbl_audit_start - Start an audit message
1149  * @type: audit message type
1150  * @audit_info: NetLabel audit information
1151  *
1152  * Description:
1153  * Start an audit message using the type specified in @type and fill the audit
1154  * message with some fields common to all NetLabel audit messages.  This
1155  * function should only be used by protocol engines, not LSMs.  Returns a
1156  * pointer to the audit buffer on success, NULL on failure.
1157  *
1158  */
1159 struct audit_buffer *netlbl_audit_start(int type,
1160                                         struct netlbl_audit *audit_info)
1161 {
1162         return netlbl_audit_start_common(type, audit_info);
1163 }
1164 
1165 /*
1166  * Setup Functions
1167  */
1168 
1169 /**
1170  * netlbl_init - Initialize NetLabel
1171  *
1172  * Description:
1173  * Perform the required NetLabel initialization before first use.
1174  *
1175  */
1176 static int __init netlbl_init(void)
1177 {
1178         int ret_val;
1179 
1180         printk(KERN_INFO "NetLabel: Initializing\n");
1181         printk(KERN_INFO "NetLabel:  domain hash size = %u\n",
1182                (1 << NETLBL_DOMHSH_BITSIZE));
1183         printk(KERN_INFO "NetLabel:  protocols ="
1184                " UNLABELED"
1185                " CIPSOv4"
1186                "\n");
1187 
1188         ret_val = netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE);
1189         if (ret_val != 0)
1190                 goto init_failure;
1191 
1192         ret_val = netlbl_unlabel_init(NETLBL_UNLHSH_BITSIZE);
1193         if (ret_val != 0)
1194                 goto init_failure;
1195 
1196         ret_val = netlbl_netlink_init();
1197         if (ret_val != 0)
1198                 goto init_failure;
1199 
1200         ret_val = netlbl_unlabel_defconf();
1201         if (ret_val != 0)
1202                 goto init_failure;
1203         printk(KERN_INFO "NetLabel:  unlabeled traffic allowed by default\n");
1204 
1205         return 0;
1206 
1207 init_failure:
1208         panic("NetLabel: failed to initialize properly (%d)\n", ret_val);
1209 }
1210 
1211 subsys_initcall(netlbl_init);
1212 

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