root/net/netlabel/netlabel_kapi.c

DEFINITIONS

1. netlbl_cfg_map_del
2. netlbl_cfg_unlbl_map_add
3. netlbl_cfg_unlbl_static_add
4. netlbl_cfg_unlbl_static_del
5. netlbl_cfg_cipsov4_add
6. netlbl_cfg_cipsov4_del
7. netlbl_cfg_cipsov4_map_add
8. netlbl_cfg_calipso_add
9. netlbl_cfg_calipso_del
10. netlbl_cfg_calipso_map_add
11. _netlbl_catmap_getnode
12. netlbl_catmap_walk
13. netlbl_catmap_walkrng
14. netlbl_catmap_getlong
15. netlbl_catmap_setbit
16. netlbl_catmap_setrng
17. netlbl_catmap_setlong
18. netlbl_bitmap_walk
19. netlbl_bitmap_setbit
20. netlbl_enabled
21. netlbl_sock_setattr
22. netlbl_sock_delattr
23. netlbl_sock_getattr
24. netlbl_conn_setattr
25. netlbl_req_setattr
26. netlbl_req_delattr
27. netlbl_skbuff_setattr
28. netlbl_skbuff_getattr
29. netlbl_skbuff_err
30. netlbl_cache_invalidate
31. netlbl_cache_add
32. netlbl_audit_start
33. netlbl_init

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * NetLabel Kernel API
   4  *
   5  * This file defines the kernel API for the NetLabel system.  The NetLabel
   6  * system manages static and dynamic label mappings for network protocols such
   7  * as CIPSO and RIPSO.
   8  *
   9  * Author: Paul Moore <paul@paul-moore.com>
  10  */
  11 
  12 /*
  13  * (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008
  14  */
  15 
  16 #include <linux/init.h>
  17 #include <linux/types.h>
  18 #include <linux/slab.h>
  19 #include <linux/audit.h>
  20 #include <linux/in.h>
  21 #include <linux/in6.h>
  22 #include <net/ip.h>
  23 #include <net/ipv6.h>
  24 #include <net/netlabel.h>
  25 #include <net/cipso_ipv4.h>
  26 #include <net/calipso.h>
  27 #include <asm/bug.h>
  28 #include <linux/atomic.h>
  29 
  30 #include "netlabel_domainhash.h"
  31 #include "netlabel_unlabeled.h"
  32 #include "netlabel_cipso_v4.h"
  33 #include "netlabel_calipso.h"
  34 #include "netlabel_user.h"
  35 #include "netlabel_mgmt.h"
  36 #include "netlabel_addrlist.h"
  37 
  38 /*
  39  * Configuration Functions
  40  */
  41 
  42 /**
  43  * netlbl_cfg_map_del - Remove a NetLabel/LSM domain mapping
  44  * @domain: the domain mapping to remove
  45  * @family: address family
  46  * @addr: IP address
  47  * @mask: IP address mask
  48  * @audit_info: NetLabel audit information
  49  *
  50  * Description:
  51  * Removes a NetLabel/LSM domain mapping.  A @domain value of NULL causes the
  52  * default domain mapping to be removed.  Returns zero on success, negative
  53  * values on failure.
  54  *
  55  */
  56 int netlbl_cfg_map_del(const char *domain,
  57                        u16 family,
  58                        const void *addr,
  59                        const void *mask,
  60                        struct netlbl_audit *audit_info)
  61 {
  62         if (addr == NULL && mask == NULL) {
  63                 return netlbl_domhsh_remove(domain, family, audit_info);
  64         } else if (addr != NULL && mask != NULL) {
  65                 switch (family) {
  66                 case AF_INET:
  67                         return netlbl_domhsh_remove_af4(domain, addr, mask,
  68                                                         audit_info);
  69 #if IS_ENABLED(CONFIG_IPV6)
  70                 case AF_INET6:
  71                         return netlbl_domhsh_remove_af6(domain, addr, mask,
  72                                                         audit_info);
  73 #endif /* IPv6 */
  74                 default:
  75                         return -EPFNOSUPPORT;
  76                 }
  77         } else
  78                 return -EINVAL;
  79 }
  80 
  81 /**
  82  * netlbl_cfg_unlbl_map_add - Add a new unlabeled mapping
  83  * @domain: the domain mapping to add
  84  * @family: address family
  85  * @addr: IP address
  86  * @mask: IP address mask
  87  * @audit_info: NetLabel audit information
  88  *
  89  * Description:
  90  * Adds a new unlabeled NetLabel/LSM domain mapping.  A @domain value of NULL
  91  * causes a new default domain mapping to be added.  Returns zero on success,
  92  * negative values on failure.
  93  *
  94  */
  95 int netlbl_cfg_unlbl_map_add(const char *domain,
  96                              u16 family,
  97                              const void *addr,
  98                              const void *mask,
  99                              struct netlbl_audit *audit_info)
 100 {
 101         int ret_val = -ENOMEM;
 102         struct netlbl_dom_map *entry;
 103         struct netlbl_domaddr_map *addrmap = NULL;
 104         struct netlbl_domaddr4_map *map4 = NULL;
 105         struct netlbl_domaddr6_map *map6 = NULL;
 106 
 107         entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
 108         if (entry == NULL)
 109                 return -ENOMEM;
 110         if (domain != NULL) {
 111                 entry->domain = kstrdup(domain, GFP_ATOMIC);
 112                 if (entry->domain == NULL)
 113                         goto cfg_unlbl_map_add_failure;
 114         }
 115         entry->family = family;
 116 
 117         if (addr == NULL && mask == NULL)
 118                 entry->def.type = NETLBL_NLTYPE_UNLABELED;
 119         else if (addr != NULL && mask != NULL) {
 120                 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
 121                 if (addrmap == NULL)
 122                         goto cfg_unlbl_map_add_failure;
 123                 INIT_LIST_HEAD(&addrmap->list4);
 124                 INIT_LIST_HEAD(&addrmap->list6);
 125 
 126                 switch (family) {
 127                 case AF_INET: {
 128                         const struct in_addr *addr4 = addr;
 129                         const struct in_addr *mask4 = mask;
 130                         map4 = kzalloc(sizeof(*map4), GFP_ATOMIC);
 131                         if (map4 == NULL)
 132                                 goto cfg_unlbl_map_add_failure;
 133                         map4->def.type = NETLBL_NLTYPE_UNLABELED;
 134                         map4->list.addr = addr4->s_addr & mask4->s_addr;
 135                         map4->list.mask = mask4->s_addr;
 136                         map4->list.valid = 1;
 137                         ret_val = netlbl_af4list_add(&map4->list,
 138                                                      &addrmap->list4);
 139                         if (ret_val != 0)
 140                                 goto cfg_unlbl_map_add_failure;
 141                         break;
 142                         }
 143 #if IS_ENABLED(CONFIG_IPV6)
 144                 case AF_INET6: {
 145                         const struct in6_addr *addr6 = addr;
 146                         const struct in6_addr *mask6 = mask;
 147                         map6 = kzalloc(sizeof(*map6), GFP_ATOMIC);
 148                         if (map6 == NULL)
 149                                 goto cfg_unlbl_map_add_failure;
 150                         map6->def.type = NETLBL_NLTYPE_UNLABELED;
 151                         map6->list.addr = *addr6;
 152                         map6->list.addr.s6_addr32[0] &= mask6->s6_addr32[0];
 153                         map6->list.addr.s6_addr32[1] &= mask6->s6_addr32[1];
 154                         map6->list.addr.s6_addr32[2] &= mask6->s6_addr32[2];
 155                         map6->list.addr.s6_addr32[3] &= mask6->s6_addr32[3];
 156                         map6->list.mask = *mask6;
 157                         map6->list.valid = 1;
 158                         ret_val = netlbl_af6list_add(&map6->list,
 159                                                      &addrmap->list6);
 160                         if (ret_val != 0)
 161                                 goto cfg_unlbl_map_add_failure;
 162                         break;
 163                         }
 164 #endif /* IPv6 */
 165                 default:
 166                         goto cfg_unlbl_map_add_failure;
 167                 }
 168 
 169                 entry->def.addrsel = addrmap;
 170                 entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
 171         } else {
 172                 ret_val = -EINVAL;
 173                 goto cfg_unlbl_map_add_failure;
 174         }
 175 
 176         ret_val = netlbl_domhsh_add(entry, audit_info);
 177         if (ret_val != 0)
 178                 goto cfg_unlbl_map_add_failure;
 179 
 180         return 0;
 181 
 182 cfg_unlbl_map_add_failure:
 183         kfree(entry->domain);
 184         kfree(entry);
 185         kfree(addrmap);
 186         kfree(map4);
 187         kfree(map6);
 188         return ret_val;
 189 }
 190 
 191 
 192 /**
 193  * netlbl_cfg_unlbl_static_add - Adds a new static label
 194  * @net: network namespace
 195  * @dev_name: interface name
 196  * @addr: IP address in network byte order (struct in[6]_addr)
 197  * @mask: address mask in network byte order (struct in[6]_addr)
 198  * @family: address family
 199  * @secid: LSM secid value for the entry
 200  * @audit_info: NetLabel audit information
 201  *
 202  * Description:
 203  * Adds a new NetLabel static label to be used when protocol provided labels
 204  * are not present on incoming traffic.  If @dev_name is NULL then the default
 205  * interface will be used.  Returns zero on success, negative values on failure.
 206  *
 207  */
 208 int netlbl_cfg_unlbl_static_add(struct net *net,
 209                                 const char *dev_name,
 210                                 const void *addr,
 211                                 const void *mask,
 212                                 u16 family,
 213                                 u32 secid,
 214                                 struct netlbl_audit *audit_info)
 215 {
 216         u32 addr_len;
 217 
 218         switch (family) {
 219         case AF_INET:
 220                 addr_len = sizeof(struct in_addr);
 221                 break;
 222 #if IS_ENABLED(CONFIG_IPV6)
 223         case AF_INET6:
 224                 addr_len = sizeof(struct in6_addr);
 225                 break;
 226 #endif /* IPv6 */
 227         default:
 228                 return -EPFNOSUPPORT;
 229         }
 230 
 231         return netlbl_unlhsh_add(net,
 232                                  dev_name, addr, mask, addr_len,
 233                                  secid, audit_info);
 234 }
 235 
 236 /**
 237  * netlbl_cfg_unlbl_static_del - Removes an existing static label
 238  * @net: network namespace
 239  * @dev_name: interface name
 240  * @addr: IP address in network byte order (struct in[6]_addr)
 241  * @mask: address mask in network byte order (struct in[6]_addr)
 242  * @family: address family
 243  * @audit_info: NetLabel audit information
 244  *
 245  * Description:
 246  * Removes an existing NetLabel static label used when protocol provided labels
 247  * are not present on incoming traffic.  If @dev_name is NULL then the default
 248  * interface will be used.  Returns zero on success, negative values on failure.
 249  *
 250  */
 251 int netlbl_cfg_unlbl_static_del(struct net *net,
 252                                 const char *dev_name,
 253                                 const void *addr,
 254                                 const void *mask,
 255                                 u16 family,
 256                                 struct netlbl_audit *audit_info)
 257 {
 258         u32 addr_len;
 259 
 260         switch (family) {
 261         case AF_INET:
 262                 addr_len = sizeof(struct in_addr);
 263                 break;
 264 #if IS_ENABLED(CONFIG_IPV6)
 265         case AF_INET6:
 266                 addr_len = sizeof(struct in6_addr);
 267                 break;
 268 #endif /* IPv6 */
 269         default:
 270                 return -EPFNOSUPPORT;
 271         }
 272 
 273         return netlbl_unlhsh_remove(net,
 274                                     dev_name, addr, mask, addr_len,
 275                                     audit_info);
 276 }
 277 
 278 /**
 279  * netlbl_cfg_cipsov4_add - Add a new CIPSOv4 DOI definition
 280  * @doi_def: CIPSO DOI definition
 281  * @audit_info: NetLabel audit information
 282  *
 283  * Description:
 284  * Add a new CIPSO DOI definition as defined by @doi_def.  Returns zero on
 285  * success and negative values on failure.
 286  *
 287  */
 288 int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def,
 289                            struct netlbl_audit *audit_info)
 290 {
 291         return cipso_v4_doi_add(doi_def, audit_info);
 292 }
 293 
 294 /**
 295  * netlbl_cfg_cipsov4_del - Remove an existing CIPSOv4 DOI definition
 296  * @doi: CIPSO DOI
 297  * @audit_info: NetLabel audit information
 298  *
 299  * Description:
 300  * Remove an existing CIPSO DOI definition matching @doi.  Returns zero on
 301  * success and negative values on failure.
 302  *
 303  */
 304 void netlbl_cfg_cipsov4_del(u32 doi, struct netlbl_audit *audit_info)
 305 {
 306         cipso_v4_doi_remove(doi, audit_info);
 307 }
 308 
 309 /**
 310  * netlbl_cfg_cipsov4_map_add - Add a new CIPSOv4 DOI mapping
 311  * @doi: the CIPSO DOI
 312  * @domain: the domain mapping to add
 313  * @addr: IP address
 314  * @mask: IP address mask
 315  * @audit_info: NetLabel audit information
 316  *
 317  * Description:
 318  * Add a new NetLabel/LSM domain mapping for the given CIPSO DOI to the NetLabel
 319  * subsystem.  A @domain value of NULL adds a new default domain mapping.
 320  * Returns zero on success, negative values on failure.
 321  *
 322  */
 323 int netlbl_cfg_cipsov4_map_add(u32 doi,
 324                                const char *domain,
 325                                const struct in_addr *addr,
 326                                const struct in_addr *mask,
 327                                struct netlbl_audit *audit_info)
 328 {
 329         int ret_val = -ENOMEM;
 330         struct cipso_v4_doi *doi_def;
 331         struct netlbl_dom_map *entry;
 332         struct netlbl_domaddr_map *addrmap = NULL;
 333         struct netlbl_domaddr4_map *addrinfo = NULL;
 334 
 335         doi_def = cipso_v4_doi_getdef(doi);
 336         if (doi_def == NULL)
 337                 return -ENOENT;
 338 
 339         entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
 340         if (entry == NULL)
 341                 goto out_entry;
 342         entry->family = AF_INET;
 343         if (domain != NULL) {
 344                 entry->domain = kstrdup(domain, GFP_ATOMIC);
 345                 if (entry->domain == NULL)
 346                         goto out_domain;
 347         }
 348 
 349         if (addr == NULL && mask == NULL) {
 350                 entry->def.cipso = doi_def;
 351                 entry->def.type = NETLBL_NLTYPE_CIPSOV4;
 352         } else if (addr != NULL && mask != NULL) {
 353                 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
 354                 if (addrmap == NULL)
 355                         goto out_addrmap;
 356                 INIT_LIST_HEAD(&addrmap->list4);
 357                 INIT_LIST_HEAD(&addrmap->list6);
 358 
 359                 addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC);
 360                 if (addrinfo == NULL)
 361                         goto out_addrinfo;
 362                 addrinfo->def.cipso = doi_def;
 363                 addrinfo->def.type = NETLBL_NLTYPE_CIPSOV4;
 364                 addrinfo->list.addr = addr->s_addr & mask->s_addr;
 365                 addrinfo->list.mask = mask->s_addr;
 366                 addrinfo->list.valid = 1;
 367                 ret_val = netlbl_af4list_add(&addrinfo->list, &addrmap->list4);
 368                 if (ret_val != 0)
 369                         goto cfg_cipsov4_map_add_failure;
 370 
 371                 entry->def.addrsel = addrmap;
 372                 entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
 373         } else {
 374                 ret_val = -EINVAL;
 375                 goto out_addrmap;
 376         }
 377 
 378         ret_val = netlbl_domhsh_add(entry, audit_info);
 379         if (ret_val != 0)
 380                 goto cfg_cipsov4_map_add_failure;
 381 
 382         return 0;
 383 
 384 cfg_cipsov4_map_add_failure:
 385         kfree(addrinfo);
 386 out_addrinfo:
 387         kfree(addrmap);
 388 out_addrmap:
 389         kfree(entry->domain);
 390 out_domain:
 391         kfree(entry);
 392 out_entry:
 393         cipso_v4_doi_putdef(doi_def);
 394         return ret_val;
 395 }
 396 
 397 /**
 398  * netlbl_cfg_calipso_add - Add a new CALIPSO DOI definition
 399  * @doi_def: CALIPSO DOI definition
 400  * @audit_info: NetLabel audit information
 401  *
 402  * Description:
 403  * Add a new CALIPSO DOI definition as defined by @doi_def.  Returns zero on
 404  * success and negative values on failure.
 405  *
 406  */
 407 int netlbl_cfg_calipso_add(struct calipso_doi *doi_def,
 408                            struct netlbl_audit *audit_info)
 409 {
 410 #if IS_ENABLED(CONFIG_IPV6)
 411         return calipso_doi_add(doi_def, audit_info);
 412 #else /* IPv6 */
 413         return -ENOSYS;
 414 #endif /* IPv6 */
 415 }
 416 
 417 /**
 418  * netlbl_cfg_calipso_del - Remove an existing CALIPSO DOI definition
 419  * @doi: CALIPSO DOI
 420  * @audit_info: NetLabel audit information
 421  *
 422  * Description:
 423  * Remove an existing CALIPSO DOI definition matching @doi.  Returns zero on
 424  * success and negative values on failure.
 425  *
 426  */
 427 void netlbl_cfg_calipso_del(u32 doi, struct netlbl_audit *audit_info)
 428 {
 429 #if IS_ENABLED(CONFIG_IPV6)
 430         calipso_doi_remove(doi, audit_info);
 431 #endif /* IPv6 */
 432 }
 433 
 434 /**
 435  * netlbl_cfg_calipso_map_add - Add a new CALIPSO DOI mapping
 436  * @doi: the CALIPSO DOI
 437  * @domain: the domain mapping to add
 438  * @addr: IP address
 439  * @mask: IP address mask
 440  * @audit_info: NetLabel audit information
 441  *
 442  * Description:
 443  * Add a new NetLabel/LSM domain mapping for the given CALIPSO DOI to the
 444  * NetLabel subsystem.  A @domain value of NULL adds a new default domain
 445  * mapping.  Returns zero on success, negative values on failure.
 446  *
 447  */
 448 int netlbl_cfg_calipso_map_add(u32 doi,
 449                                const char *domain,
 450                                const struct in6_addr *addr,
 451                                const struct in6_addr *mask,
 452                                struct netlbl_audit *audit_info)
 453 {
 454 #if IS_ENABLED(CONFIG_IPV6)
 455         int ret_val = -ENOMEM;
 456         struct calipso_doi *doi_def;
 457         struct netlbl_dom_map *entry;
 458         struct netlbl_domaddr_map *addrmap = NULL;
 459         struct netlbl_domaddr6_map *addrinfo = NULL;
 460 
 461         doi_def = calipso_doi_getdef(doi);
 462         if (doi_def == NULL)
 463                 return -ENOENT;
 464 
 465         entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
 466         if (entry == NULL)
 467                 goto out_entry;
 468         entry->family = AF_INET6;
 469         if (domain != NULL) {
 470                 entry->domain = kstrdup(domain, GFP_ATOMIC);
 471                 if (entry->domain == NULL)
 472                         goto out_domain;
 473         }
 474 
 475         if (addr == NULL && mask == NULL) {
 476                 entry->def.calipso = doi_def;
 477                 entry->def.type = NETLBL_NLTYPE_CALIPSO;
 478         } else if (addr != NULL && mask != NULL) {
 479                 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
 480                 if (addrmap == NULL)
 481                         goto out_addrmap;
 482                 INIT_LIST_HEAD(&addrmap->list4);
 483                 INIT_LIST_HEAD(&addrmap->list6);
 484 
 485                 addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC);
 486                 if (addrinfo == NULL)
 487                         goto out_addrinfo;
 488                 addrinfo->def.calipso = doi_def;
 489                 addrinfo->def.type = NETLBL_NLTYPE_CALIPSO;
 490                 addrinfo->list.addr = *addr;
 491                 addrinfo->list.addr.s6_addr32[0] &= mask->s6_addr32[0];
 492                 addrinfo->list.addr.s6_addr32[1] &= mask->s6_addr32[1];
 493                 addrinfo->list.addr.s6_addr32[2] &= mask->s6_addr32[2];
 494                 addrinfo->list.addr.s6_addr32[3] &= mask->s6_addr32[3];
 495                 addrinfo->list.mask = *mask;
 496                 addrinfo->list.valid = 1;
 497                 ret_val = netlbl_af6list_add(&addrinfo->list, &addrmap->list6);
 498                 if (ret_val != 0)
 499                         goto cfg_calipso_map_add_failure;
 500 
 501                 entry->def.addrsel = addrmap;
 502                 entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
 503         } else {
 504                 ret_val = -EINVAL;
 505                 goto out_addrmap;
 506         }
 507 
 508         ret_val = netlbl_domhsh_add(entry, audit_info);
 509         if (ret_val != 0)
 510                 goto cfg_calipso_map_add_failure;
 511 
 512         return 0;
 513 
 514 cfg_calipso_map_add_failure:
 515         kfree(addrinfo);
 516 out_addrinfo:
 517         kfree(addrmap);
 518 out_addrmap:
 519         kfree(entry->domain);
 520 out_domain:
 521         kfree(entry);
 522 out_entry:
 523         calipso_doi_putdef(doi_def);
 524         return ret_val;
 525 #else /* IPv6 */
 526         return -ENOSYS;
 527 #endif /* IPv6 */
 528 }
 529 
 530 /*
 531  * Security Attribute Functions
 532  */
 533 
 534 #define _CM_F_NONE      0x00000000
 535 #define _CM_F_ALLOC     0x00000001
 536 #define _CM_F_WALK      0x00000002
 537 
 538 /**
 539  * _netlbl_catmap_getnode - Get a individual node from a catmap
 540  * @catmap: pointer to the category bitmap
 541  * @offset: the requested offset
 542  * @cm_flags: catmap flags, see _CM_F_*
 543  * @gfp_flags: memory allocation flags
 544  *
 545  * Description:
 546  * Iterate through the catmap looking for the node associated with @offset.
 547  * If the _CM_F_ALLOC flag is set in @cm_flags and there is no associated node,
 548  * one will be created and inserted into the catmap.  If the _CM_F_WALK flag is
 549  * set in @cm_flags and there is no associated node, the next highest node will
 550  * be returned.  Returns a pointer to the node on success, NULL on failure.
 551  *
 552  */
 553 static struct netlbl_lsm_catmap *_netlbl_catmap_getnode(
 554                                              struct netlbl_lsm_catmap **catmap,
 555                                              u32 offset,
 556                                              unsigned int cm_flags,
 557                                              gfp_t gfp_flags)
 558 {
 559         struct netlbl_lsm_catmap *iter = *catmap;
 560         struct netlbl_lsm_catmap *prev = NULL;
 561 
 562         if (iter == NULL)
 563                 goto catmap_getnode_alloc;
 564         if (offset < iter->startbit)
 565                 goto catmap_getnode_walk;
 566         while (iter && offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
 567                 prev = iter;
 568                 iter = iter->next;
 569         }
 570         if (iter == NULL || offset < iter->startbit)
 571                 goto catmap_getnode_walk;
 572 
 573         return iter;
 574 
 575 catmap_getnode_walk:
 576         if (cm_flags & _CM_F_WALK)
 577                 return iter;
 578 catmap_getnode_alloc:
 579         if (!(cm_flags & _CM_F_ALLOC))
 580                 return NULL;
 581 
 582         iter = netlbl_catmap_alloc(gfp_flags);
 583         if (iter == NULL)
 584                 return NULL;
 585         iter->startbit = offset & ~(NETLBL_CATMAP_SIZE - 1);
 586 
 587         if (prev == NULL) {
 588                 iter->next = *catmap;
 589                 *catmap = iter;
 590         } else {
 591                 iter->next = prev->next;
 592                 prev->next = iter;
 593         }
 594 
 595         return iter;
 596 }
 597 
 598 /**
 599  * netlbl_catmap_walk - Walk a LSM secattr catmap looking for a bit
 600  * @catmap: the category bitmap
 601  * @offset: the offset to start searching at, in bits
 602  *
 603  * Description:
 604  * This function walks a LSM secattr category bitmap starting at @offset and
 605  * returns the spot of the first set bit or -ENOENT if no bits are set.
 606  *
 607  */
 608 int netlbl_catmap_walk(struct netlbl_lsm_catmap *catmap, u32 offset)
 609 {
 610         struct netlbl_lsm_catmap *iter;
 611         u32 idx;
 612         u32 bit;
 613         NETLBL_CATMAP_MAPTYPE bitmap;
 614 
 615         iter = _netlbl_catmap_getnode(&catmap, offset, _CM_F_WALK, 0);
 616         if (iter == NULL)
 617                 return -ENOENT;
 618         if (offset > iter->startbit) {
 619                 offset -= iter->startbit;
 620                 idx = offset / NETLBL_CATMAP_MAPSIZE;
 621                 bit = offset % NETLBL_CATMAP_MAPSIZE;
 622         } else {
 623                 idx = 0;
 624                 bit = 0;
 625         }
 626         bitmap = iter->bitmap[idx] >> bit;
 627 
 628         for (;;) {
 629                 if (bitmap != 0) {
 630                         while ((bitmap & NETLBL_CATMAP_BIT) == 0) {
 631                                 bitmap >>= 1;
 632                                 bit++;
 633                         }
 634                         return iter->startbit +
 635                                (NETLBL_CATMAP_MAPSIZE * idx) + bit;
 636                 }
 637                 if (++idx >= NETLBL_CATMAP_MAPCNT) {
 638                         if (iter->next != NULL) {
 639                                 iter = iter->next;
 640                                 idx = 0;
 641                         } else
 642                                 return -ENOENT;
 643                 }
 644                 bitmap = iter->bitmap[idx];
 645                 bit = 0;
 646         }
 647 
 648         return -ENOENT;
 649 }
 650 EXPORT_SYMBOL(netlbl_catmap_walk);
 651 
 652 /**
 653  * netlbl_catmap_walkrng - Find the end of a string of set bits
 654  * @catmap: the category bitmap
 655  * @offset: the offset to start searching at, in bits
 656  *
 657  * Description:
 658  * This function walks a LSM secattr category bitmap starting at @offset and
 659  * returns the spot of the first cleared bit or -ENOENT if the offset is past
 660  * the end of the bitmap.
 661  *
 662  */
 663 int netlbl_catmap_walkrng(struct netlbl_lsm_catmap *catmap, u32 offset)
 664 {
 665         struct netlbl_lsm_catmap *iter;
 666         struct netlbl_lsm_catmap *prev = NULL;
 667         u32 idx;
 668         u32 bit;
 669         NETLBL_CATMAP_MAPTYPE bitmask;
 670         NETLBL_CATMAP_MAPTYPE bitmap;
 671 
 672         iter = _netlbl_catmap_getnode(&catmap, offset, _CM_F_WALK, 0);
 673         if (iter == NULL)
 674                 return -ENOENT;
 675         if (offset > iter->startbit) {
 676                 offset -= iter->startbit;
 677                 idx = offset / NETLBL_CATMAP_MAPSIZE;
 678                 bit = offset % NETLBL_CATMAP_MAPSIZE;
 679         } else {
 680                 idx = 0;
 681                 bit = 0;
 682         }
 683         bitmask = NETLBL_CATMAP_BIT << bit;
 684 
 685         for (;;) {
 686                 bitmap = iter->bitmap[idx];
 687                 while (bitmask != 0 && (bitmap & bitmask) != 0) {
 688                         bitmask <<= 1;
 689                         bit++;
 690                 }
 691 
 692                 if (prev && idx == 0 && bit == 0)
 693                         return prev->startbit + NETLBL_CATMAP_SIZE - 1;
 694                 else if (bitmask != 0)
 695                         return iter->startbit +
 696                                 (NETLBL_CATMAP_MAPSIZE * idx) + bit - 1;
 697                 else if (++idx >= NETLBL_CATMAP_MAPCNT) {
 698                         if (iter->next == NULL)
 699                                 return iter->startbit + NETLBL_CATMAP_SIZE - 1;
 700                         prev = iter;
 701                         iter = iter->next;
 702                         idx = 0;
 703                 }
 704                 bitmask = NETLBL_CATMAP_BIT;
 705                 bit = 0;
 706         }
 707 
 708         return -ENOENT;
 709 }
 710 
 711 /**
 712  * netlbl_catmap_getlong - Export an unsigned long bitmap
 713  * @catmap: pointer to the category bitmap
 714  * @offset: pointer to the requested offset
 715  * @bitmap: the exported bitmap
 716  *
 717  * Description:
 718  * Export a bitmap with an offset greater than or equal to @offset and return
 719  * it in @bitmap.  The @offset must be aligned to an unsigned long and will be
 720  * updated on return if different from what was requested; if the catmap is
 721  * empty at the requested offset and beyond, the @offset is set to (u32)-1.
 722  * Returns zero on sucess, negative values on failure.
 723  *
 724  */
 725 int netlbl_catmap_getlong(struct netlbl_lsm_catmap *catmap,
 726                           u32 *offset,
 727                           unsigned long *bitmap)
 728 {
 729         struct netlbl_lsm_catmap *iter;
 730         u32 off = *offset;
 731         u32 idx;
 732 
 733         /* only allow aligned offsets */
 734         if ((off & (BITS_PER_LONG - 1)) != 0)
 735                 return -EINVAL;
 736 
 737         /* a null catmap is equivalent to an empty one */
 738         if (!catmap) {
 739                 *offset = (u32)-1;
 740                 return 0;
 741         }
 742 
 743         if (off < catmap->startbit) {
 744                 off = catmap->startbit;
 745                 *offset = off;
 746         }
 747         iter = _netlbl_catmap_getnode(&catmap, off, _CM_F_WALK, 0);
 748         if (iter == NULL) {
 749                 *offset = (u32)-1;
 750                 return 0;
 751         }
 752 
 753         if (off < iter->startbit) {
 754                 *offset = iter->startbit;
 755                 off = 0;
 756         } else
 757                 off -= iter->startbit;
 758         idx = off / NETLBL_CATMAP_MAPSIZE;
 759         *bitmap = iter->bitmap[idx] >> (off % NETLBL_CATMAP_MAPSIZE);
 760 
 761         return 0;
 762 }
 763 
 764 /**
 765  * netlbl_catmap_setbit - Set a bit in a LSM secattr catmap
 766  * @catmap: pointer to the category bitmap
 767  * @bit: the bit to set
 768  * @flags: memory allocation flags
 769  *
 770  * Description:
 771  * Set the bit specified by @bit in @catmap.  Returns zero on success,
 772  * negative values on failure.
 773  *
 774  */
 775 int netlbl_catmap_setbit(struct netlbl_lsm_catmap **catmap,
 776                          u32 bit,
 777                          gfp_t flags)
 778 {
 779         struct netlbl_lsm_catmap *iter;
 780         u32 idx;
 781 
 782         iter = _netlbl_catmap_getnode(catmap, bit, _CM_F_ALLOC, flags);
 783         if (iter == NULL)
 784                 return -ENOMEM;
 785 
 786         bit -= iter->startbit;
 787         idx = bit / NETLBL_CATMAP_MAPSIZE;
 788         iter->bitmap[idx] |= NETLBL_CATMAP_BIT << (bit % NETLBL_CATMAP_MAPSIZE);
 789 
 790         return 0;
 791 }
 792 EXPORT_SYMBOL(netlbl_catmap_setbit);
 793 
 794 /**
 795  * netlbl_catmap_setrng - Set a range of bits in a LSM secattr catmap
 796  * @catmap: pointer to the category bitmap
 797  * @start: the starting bit
 798  * @end: the last bit in the string
 799  * @flags: memory allocation flags
 800  *
 801  * Description:
 802  * Set a range of bits, starting at @start and ending with @end.  Returns zero
 803  * on success, negative values on failure.
 804  *
 805  */
 806 int netlbl_catmap_setrng(struct netlbl_lsm_catmap **catmap,
 807                          u32 start,
 808                          u32 end,
 809                          gfp_t flags)
 810 {
 811         int rc = 0;
 812         u32 spot = start;
 813 
 814         while (rc == 0 && spot <= end) {
 815                 if (((spot & (BITS_PER_LONG - 1)) == 0) &&
 816                     ((end - spot) > BITS_PER_LONG)) {
 817                         rc = netlbl_catmap_setlong(catmap,
 818                                                    spot,
 819                                                    (unsigned long)-1,
 820                                                    flags);
 821                         spot += BITS_PER_LONG;
 822                 } else
 823                         rc = netlbl_catmap_setbit(catmap, spot++, flags);
 824         }
 825 
 826         return rc;
 827 }
 828 
 829 /**
 830  * netlbl_catmap_setlong - Import an unsigned long bitmap
 831  * @catmap: pointer to the category bitmap
 832  * @offset: offset to the start of the imported bitmap
 833  * @bitmap: the bitmap to import
 834  * @flags: memory allocation flags
 835  *
 836  * Description:
 837  * Import the bitmap specified in @bitmap into @catmap, using the offset
 838  * in @offset.  The offset must be aligned to an unsigned long.  Returns zero
 839  * on success, negative values on failure.
 840  *
 841  */
 842 int netlbl_catmap_setlong(struct netlbl_lsm_catmap **catmap,
 843                           u32 offset,
 844                           unsigned long bitmap,
 845                           gfp_t flags)
 846 {
 847         struct netlbl_lsm_catmap *iter;
 848         u32 idx;
 849 
 850         /* only allow aligned offsets */
 851         if ((offset & (BITS_PER_LONG - 1)) != 0)
 852                 return -EINVAL;
 853 
 854         iter = _netlbl_catmap_getnode(catmap, offset, _CM_F_ALLOC, flags);
 855         if (iter == NULL)
 856                 return -ENOMEM;
 857 
 858         offset -= iter->startbit;
 859         idx = offset / NETLBL_CATMAP_MAPSIZE;
 860         iter->bitmap[idx] |= bitmap << (offset % NETLBL_CATMAP_MAPSIZE);
 861 
 862         return 0;
 863 }
 864 
 865 /* Bitmap functions
 866  */
 867 
 868 /**
 869  * netlbl_bitmap_walk - Walk a bitmap looking for a bit
 870  * @bitmap: the bitmap
 871  * @bitmap_len: length in bits
 872  * @offset: starting offset
 873  * @state: if non-zero, look for a set (1) bit else look for a cleared (0) bit
 874  *
 875  * Description:
 876  * Starting at @offset, walk the bitmap from left to right until either the
 877  * desired bit is found or we reach the end.  Return the bit offset, -1 if
 878  * not found, or -2 if error.
 879  */
 880 int netlbl_bitmap_walk(const unsigned char *bitmap, u32 bitmap_len,
 881                        u32 offset, u8 state)
 882 {
 883         u32 bit_spot;
 884         u32 byte_offset;
 885         unsigned char bitmask;
 886         unsigned char byte;
 887 
 888         byte_offset = offset / 8;
 889         byte = bitmap[byte_offset];
 890         bit_spot = offset;
 891         bitmask = 0x80 >> (offset % 8);
 892 
 893         while (bit_spot < bitmap_len) {
 894                 if ((state && (byte & bitmask) == bitmask) ||
 895                     (state == 0 && (byte & bitmask) == 0))
 896                         return bit_spot;
 897 
 898                 if (++bit_spot >= bitmap_len)
 899                         return -1;
 900                 bitmask >>= 1;
 901                 if (bitmask == 0) {
 902                         byte = bitmap[++byte_offset];
 903                         bitmask = 0x80;
 904                 }
 905         }
 906 
 907         return -1;
 908 }
 909 EXPORT_SYMBOL(netlbl_bitmap_walk);
 910 
 911 /**
 912  * netlbl_bitmap_setbit - Sets a single bit in a bitmap
 913  * @bitmap: the bitmap
 914  * @bit: the bit
 915  * @state: if non-zero, set the bit (1) else clear the bit (0)
 916  *
 917  * Description:
 918  * Set a single bit in the bitmask.  Returns zero on success, negative values
 919  * on error.
 920  */
 921 void netlbl_bitmap_setbit(unsigned char *bitmap, u32 bit, u8 state)
 922 {
 923         u32 byte_spot;
 924         u8 bitmask;
 925 
 926         /* gcc always rounds to zero when doing integer division */
 927         byte_spot = bit / 8;
 928         bitmask = 0x80 >> (bit % 8);
 929         if (state)
 930                 bitmap[byte_spot] |= bitmask;
 931         else
 932                 bitmap[byte_spot] &= ~bitmask;
 933 }
 934 EXPORT_SYMBOL(netlbl_bitmap_setbit);
 935 
 936 /*
 937  * LSM Functions
 938  */
 939 
 940 /**
 941  * netlbl_enabled - Determine if the NetLabel subsystem is enabled
 942  *
 943  * Description:
 944  * The LSM can use this function to determine if it should use NetLabel
 945  * security attributes in it's enforcement mechanism.  Currently, NetLabel is
 946  * considered to be enabled when it's configuration contains a valid setup for
 947  * at least one labeled protocol (i.e. NetLabel can understand incoming
 948  * labeled packets of at least one type); otherwise NetLabel is considered to
 949  * be disabled.
 950  *
 951  */
 952 int netlbl_enabled(void)
 953 {
 954         /* At some point we probably want to expose this mechanism to the user
 955          * as well so that admins can toggle NetLabel regardless of the
 956          * configuration */
 957         return (atomic_read(&netlabel_mgmt_protocount) > 0);
 958 }
 959 
 960 /**
 961  * netlbl_sock_setattr - Label a socket using the correct protocol
 962  * @sk: the socket to label
 963  * @family: protocol family
 964  * @secattr: the security attributes
 965  *
 966  * Description:
 967  * Attach the correct label to the given socket using the security attributes
 968  * specified in @secattr.  This function requires exclusive access to @sk,
 969  * which means it either needs to be in the process of being created or locked.
 970  * Returns zero on success, -EDESTADDRREQ if the domain is configured to use
 971  * network address selectors (can't blindly label the socket), and negative
 972  * values on all other failures.
 973  *
 974  */
 975 int netlbl_sock_setattr(struct sock *sk,
 976                         u16 family,
 977                         const struct netlbl_lsm_secattr *secattr)
 978 {
 979         int ret_val;
 980         struct netlbl_dom_map *dom_entry;
 981 
 982         rcu_read_lock();
 983         dom_entry = netlbl_domhsh_getentry(secattr->domain, family);
 984         if (dom_entry == NULL) {
 985                 ret_val = -ENOENT;
 986                 goto socket_setattr_return;
 987         }
 988         switch (family) {
 989         case AF_INET:
 990                 switch (dom_entry->def.type) {
 991                 case NETLBL_NLTYPE_ADDRSELECT:
 992                         ret_val = -EDESTADDRREQ;
 993                         break;
 994                 case NETLBL_NLTYPE_CIPSOV4:
 995                         ret_val = cipso_v4_sock_setattr(sk,
 996                                                         dom_entry->def.cipso,
 997                                                         secattr);
 998                         break;
 999                 case NETLBL_NLTYPE_UNLABELED:
1000                         ret_val = 0;
1001                         break;
1002                 default:
1003                         ret_val = -ENOENT;
1004                 }
1005                 break;
1006 #if IS_ENABLED(CONFIG_IPV6)
1007         case AF_INET6:
1008                 switch (dom_entry->def.type) {
1009                 case NETLBL_NLTYPE_ADDRSELECT:
1010                         ret_val = -EDESTADDRREQ;
1011                         break;
1012                 case NETLBL_NLTYPE_CALIPSO:
1013                         ret_val = calipso_sock_setattr(sk,
1014                                                        dom_entry->def.calipso,
1015                                                        secattr);
1016                         break;
1017                 case NETLBL_NLTYPE_UNLABELED:
1018                         ret_val = 0;
1019                         break;
1020                 default:
1021                         ret_val = -ENOENT;
1022                 }
1023                 break;
1024 #endif /* IPv6 */
1025         default:
1026                 ret_val = -EPROTONOSUPPORT;
1027         }
1028 
1029 socket_setattr_return:
1030         rcu_read_unlock();
1031         return ret_val;
1032 }
1033 
1034 /**
1035  * netlbl_sock_delattr - Delete all the NetLabel labels on a socket
1036  * @sk: the socket
1037  *
1038  * Description:
1039  * Remove all the NetLabel labeling from @sk.  The caller is responsible for
1040  * ensuring that @sk is locked.
1041  *
1042  */
1043 void netlbl_sock_delattr(struct sock *sk)
1044 {
1045         switch (sk->sk_family) {
1046         case AF_INET:
1047                 cipso_v4_sock_delattr(sk);
1048                 break;
1049 #if IS_ENABLED(CONFIG_IPV6)
1050         case AF_INET6:
1051                 calipso_sock_delattr(sk);
1052                 break;
1053 #endif /* IPv6 */
1054         }
1055 }
1056 
1057 /**
1058  * netlbl_sock_getattr - Determine the security attributes of a sock
1059  * @sk: the sock
1060  * @secattr: the security attributes
1061  *
1062  * Description:
1063  * Examines the given sock to see if any NetLabel style labeling has been
1064  * applied to the sock, if so it parses the socket label and returns the
1065  * security attributes in @secattr.  Returns zero on success, negative values
1066  * on failure.
1067  *
1068  */
1069 int netlbl_sock_getattr(struct sock *sk,
1070                         struct netlbl_lsm_secattr *secattr)
1071 {
1072         int ret_val;
1073 
1074         switch (sk->sk_family) {
1075         case AF_INET:
1076                 ret_val = cipso_v4_sock_getattr(sk, secattr);
1077                 break;
1078 #if IS_ENABLED(CONFIG_IPV6)
1079         case AF_INET6:
1080                 ret_val = calipso_sock_getattr(sk, secattr);
1081                 break;
1082 #endif /* IPv6 */
1083         default:
1084                 ret_val = -EPROTONOSUPPORT;
1085         }
1086 
1087         return ret_val;
1088 }
1089 
1090 /**
1091  * netlbl_conn_setattr - Label a connected socket using the correct protocol
1092  * @sk: the socket to label
1093  * @addr: the destination address
1094  * @secattr: the security attributes
1095  *
1096  * Description:
1097  * Attach the correct label to the given connected socket using the security
1098  * attributes specified in @secattr.  The caller is responsible for ensuring
1099  * that @sk is locked.  Returns zero on success, negative values on failure.
1100  *
1101  */
1102 int netlbl_conn_setattr(struct sock *sk,
1103                         struct sockaddr *addr,
1104                         const struct netlbl_lsm_secattr *secattr)
1105 {
1106         int ret_val;
1107         struct sockaddr_in *addr4;
1108 #if IS_ENABLED(CONFIG_IPV6)
1109         struct sockaddr_in6 *addr6;
1110 #endif
1111         struct netlbl_dommap_def *entry;
1112 
1113         rcu_read_lock();
1114         switch (addr->sa_family) {
1115         case AF_INET:
1116                 addr4 = (struct sockaddr_in *)addr;
1117                 entry = netlbl_domhsh_getentry_af4(secattr->domain,
1118                                                    addr4->sin_addr.s_addr);
1119                 if (entry == NULL) {
1120                         ret_val = -ENOENT;
1121                         goto conn_setattr_return;
1122                 }
1123                 switch (entry->type) {
1124                 case NETLBL_NLTYPE_CIPSOV4:
1125                         ret_val = cipso_v4_sock_setattr(sk,
1126                                                         entry->cipso, secattr);
1127                         break;
1128                 case NETLBL_NLTYPE_UNLABELED:
1129                         /* just delete the protocols we support for right now
1130                          * but we could remove other protocols if needed */
1131                         netlbl_sock_delattr(sk);
1132                         ret_val = 0;
1133                         break;
1134                 default:
1135                         ret_val = -ENOENT;
1136                 }
1137                 break;
1138 #if IS_ENABLED(CONFIG_IPV6)
1139         case AF_INET6:
1140                 addr6 = (struct sockaddr_in6 *)addr;
1141                 entry = netlbl_domhsh_getentry_af6(secattr->domain,
1142                                                    &addr6->sin6_addr);
1143                 if (entry == NULL) {
1144                         ret_val = -ENOENT;
1145                         goto conn_setattr_return;
1146                 }
1147                 switch (entry->type) {
1148                 case NETLBL_NLTYPE_CALIPSO:
1149                         ret_val = calipso_sock_setattr(sk,
1150                                                        entry->calipso, secattr);
1151                         break;
1152                 case NETLBL_NLTYPE_UNLABELED:
1153                         /* just delete the protocols we support for right now
1154                          * but we could remove other protocols if needed */
1155                         netlbl_sock_delattr(sk);
1156                         ret_val = 0;
1157                         break;
1158                 default:
1159                         ret_val = -ENOENT;
1160                 }
1161                 break;
1162 #endif /* IPv6 */
1163         default:
1164                 ret_val = -EPROTONOSUPPORT;
1165         }
1166 
1167 conn_setattr_return:
1168         rcu_read_unlock();
1169         return ret_val;
1170 }
1171 
1172 /**
1173  * netlbl_req_setattr - Label a request socket using the correct protocol
1174  * @req: the request socket to label
1175  * @secattr: the security attributes
1176  *
1177  * Description:
1178  * Attach the correct label to the given socket using the security attributes
1179  * specified in @secattr.  Returns zero on success, negative values on failure.
1180  *
1181  */
1182 int netlbl_req_setattr(struct request_sock *req,
1183                        const struct netlbl_lsm_secattr *secattr)
1184 {
1185         int ret_val;
1186         struct netlbl_dommap_def *entry;
1187         struct inet_request_sock *ireq = inet_rsk(req);
1188 
1189         rcu_read_lock();
1190         switch (req->rsk_ops->family) {
1191         case AF_INET:
1192                 entry = netlbl_domhsh_getentry_af4(secattr->domain,
1193                                                    ireq->ir_rmt_addr);
1194                 if (entry == NULL) {
1195                         ret_val = -ENOENT;
1196                         goto req_setattr_return;
1197                 }
1198                 switch (entry->type) {
1199                 case NETLBL_NLTYPE_CIPSOV4:
1200                         ret_val = cipso_v4_req_setattr(req,
1201                                                        entry->cipso, secattr);
1202                         break;
1203                 case NETLBL_NLTYPE_UNLABELED:
1204                         netlbl_req_delattr(req);
1205                         ret_val = 0;
1206                         break;
1207                 default:
1208                         ret_val = -ENOENT;
1209                 }
1210                 break;
1211 #if IS_ENABLED(CONFIG_IPV6)
1212         case AF_INET6:
1213                 entry = netlbl_domhsh_getentry_af6(secattr->domain,
1214                                                    &ireq->ir_v6_rmt_addr);
1215                 if (entry == NULL) {
1216                         ret_val = -ENOENT;
1217                         goto req_setattr_return;
1218                 }
1219                 switch (entry->type) {
1220                 case NETLBL_NLTYPE_CALIPSO:
1221                         ret_val = calipso_req_setattr(req,
1222                                                       entry->calipso, secattr);
1223                         break;
1224                 case NETLBL_NLTYPE_UNLABELED:
1225                         netlbl_req_delattr(req);
1226                         ret_val = 0;
1227                         break;
1228                 default:
1229                         ret_val = -ENOENT;
1230                 }
1231                 break;
1232 #endif /* IPv6 */
1233         default:
1234                 ret_val = -EPROTONOSUPPORT;
1235         }
1236 
1237 req_setattr_return:
1238         rcu_read_unlock();
1239         return ret_val;
1240 }
1241 
1242 /**
1243 * netlbl_req_delattr - Delete all the NetLabel labels on a socket
1244 * @req: the socket
1245 *
1246 * Description:
1247 * Remove all the NetLabel labeling from @req.
1248 *
1249 */
1250 void netlbl_req_delattr(struct request_sock *req)
1251 {
1252         switch (req->rsk_ops->family) {
1253         case AF_INET:
1254                 cipso_v4_req_delattr(req);
1255                 break;
1256 #if IS_ENABLED(CONFIG_IPV6)
1257         case AF_INET6:
1258                 calipso_req_delattr(req);
1259                 break;
1260 #endif /* IPv6 */
1261         }
1262 }
1263 
1264 /**
1265  * netlbl_skbuff_setattr - Label a packet using the correct protocol
1266  * @skb: the packet
1267  * @family: protocol family
1268  * @secattr: the security attributes
1269  *
1270  * Description:
1271  * Attach the correct label to the given packet using the security attributes
1272  * specified in @secattr.  Returns zero on success, negative values on failure.
1273  *
1274  */
1275 int netlbl_skbuff_setattr(struct sk_buff *skb,
1276                           u16 family,
1277                           const struct netlbl_lsm_secattr *secattr)
1278 {
1279         int ret_val;
1280         struct iphdr *hdr4;
1281 #if IS_ENABLED(CONFIG_IPV6)
1282         struct ipv6hdr *hdr6;
1283 #endif
1284         struct netlbl_dommap_def *entry;
1285 
1286         rcu_read_lock();
1287         switch (family) {
1288         case AF_INET:
1289                 hdr4 = ip_hdr(skb);
1290                 entry = netlbl_domhsh_getentry_af4(secattr->domain,
1291                                                    hdr4->daddr);
1292                 if (entry == NULL) {
1293                         ret_val = -ENOENT;
1294                         goto skbuff_setattr_return;
1295                 }
1296                 switch (entry->type) {
1297                 case NETLBL_NLTYPE_CIPSOV4:
1298                         ret_val = cipso_v4_skbuff_setattr(skb, entry->cipso,
1299                                                           secattr);
1300                         break;
1301                 case NETLBL_NLTYPE_UNLABELED:
1302                         /* just delete the protocols we support for right now
1303                          * but we could remove other protocols if needed */
1304                         ret_val = cipso_v4_skbuff_delattr(skb);
1305                         break;
1306                 default:
1307                         ret_val = -ENOENT;
1308                 }
1309                 break;
1310 #if IS_ENABLED(CONFIG_IPV6)
1311         case AF_INET6:
1312                 hdr6 = ipv6_hdr(skb);
1313                 entry = netlbl_domhsh_getentry_af6(secattr->domain,
1314                                                    &hdr6->daddr);
1315                 if (entry == NULL) {
1316                         ret_val = -ENOENT;
1317                         goto skbuff_setattr_return;
1318                 }
1319                 switch (entry->type) {
1320                 case NETLBL_NLTYPE_CALIPSO:
1321                         ret_val = calipso_skbuff_setattr(skb, entry->calipso,
1322                                                          secattr);
1323                         break;
1324                 case NETLBL_NLTYPE_UNLABELED:
1325                         /* just delete the protocols we support for right now
1326                          * but we could remove other protocols if needed */
1327                         ret_val = calipso_skbuff_delattr(skb);
1328                         break;
1329                 default:
1330                         ret_val = -ENOENT;
1331                 }
1332                 break;
1333 #endif /* IPv6 */
1334         default:
1335                 ret_val = -EPROTONOSUPPORT;
1336         }
1337 
1338 skbuff_setattr_return:
1339         rcu_read_unlock();
1340         return ret_val;
1341 }
1342 
1343 /**
1344  * netlbl_skbuff_getattr - Determine the security attributes of a packet
1345  * @skb: the packet
1346  * @family: protocol family
1347  * @secattr: the security attributes
1348  *
1349  * Description:
1350  * Examines the given packet to see if a recognized form of packet labeling
1351  * is present, if so it parses the packet label and returns the security
1352  * attributes in @secattr.  Returns zero on success, negative values on
1353  * failure.
1354  *
1355  */
1356 int netlbl_skbuff_getattr(const struct sk_buff *skb,
1357                           u16 family,
1358                           struct netlbl_lsm_secattr *secattr)
1359 {
1360         unsigned char *ptr;
1361 
1362         switch (family) {
1363         case AF_INET:
1364                 ptr = cipso_v4_optptr(skb);
1365                 if (ptr && cipso_v4_getattr(ptr, secattr) == 0)
1366                         return 0;
1367                 break;
1368 #if IS_ENABLED(CONFIG_IPV6)
1369         case AF_INET6:
1370                 ptr = calipso_optptr(skb);
1371                 if (ptr && calipso_getattr(ptr, secattr) == 0)
1372                         return 0;
1373                 break;
1374 #endif /* IPv6 */
1375         }
1376 
1377         return netlbl_unlabel_getattr(skb, family, secattr);
1378 }
1379 
1380 /**
1381  * netlbl_skbuff_err - Handle a LSM error on a sk_buff
1382  * @skb: the packet
1383  * @family: the family
1384  * @error: the error code
1385  * @gateway: true if host is acting as a gateway, false otherwise
1386  *
1387  * Description:
1388  * Deal with a LSM problem when handling the packet in @skb, typically this is
1389  * a permission denied problem (-EACCES).  The correct action is determined
1390  * according to the packet's labeling protocol.
1391  *
1392  */
1393 void netlbl_skbuff_err(struct sk_buff *skb, u16 family, int error, int gateway)
1394 {
1395         switch (family) {
1396         case AF_INET:
1397                 if (cipso_v4_optptr(skb))
1398                         cipso_v4_error(skb, error, gateway);
1399                 break;
1400         }
1401 }
1402 
1403 /**
1404  * netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches
1405  *
1406  * Description:
1407  * For all of the NetLabel protocols that support some form of label mapping
1408  * cache, invalidate the cache.  Returns zero on success, negative values on
1409  * error.
1410  *
1411  */
1412 void netlbl_cache_invalidate(void)
1413 {
1414         cipso_v4_cache_invalidate();
1415 #if IS_ENABLED(CONFIG_IPV6)
1416         calipso_cache_invalidate();
1417 #endif /* IPv6 */
1418 }
1419 
1420 /**
1421  * netlbl_cache_add - Add an entry to a NetLabel protocol cache
1422  * @skb: the packet
1423  * @family: the family
1424  * @secattr: the packet's security attributes
1425  *
1426  * Description:
1427  * Add the LSM security attributes for the given packet to the underlying
1428  * NetLabel protocol's label mapping cache.  Returns zero on success, negative
1429  * values on error.
1430  *
1431  */
1432 int netlbl_cache_add(const struct sk_buff *skb, u16 family,
1433                      const struct netlbl_lsm_secattr *secattr)
1434 {
1435         unsigned char *ptr;
1436 
1437         if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0)
1438                 return -ENOMSG;
1439 
1440         switch (family) {
1441         case AF_INET:
1442                 ptr = cipso_v4_optptr(skb);
1443                 if (ptr)
1444                         return cipso_v4_cache_add(ptr, secattr);
1445                 break;
1446 #if IS_ENABLED(CONFIG_IPV6)
1447         case AF_INET6:
1448                 ptr = calipso_optptr(skb);
1449                 if (ptr)
1450                         return calipso_cache_add(ptr, secattr);
1451                 break;
1452 #endif /* IPv6 */
1453         }
1454         return -ENOMSG;
1455 }
1456 
1457 /*
1458  * Protocol Engine Functions
1459  */
1460 
1461 /**
1462  * netlbl_audit_start - Start an audit message
1463  * @type: audit message type
1464  * @audit_info: NetLabel audit information
1465  *
1466  * Description:
1467  * Start an audit message using the type specified in @type and fill the audit
1468  * message with some fields common to all NetLabel audit messages.  This
1469  * function should only be used by protocol engines, not LSMs.  Returns a
1470  * pointer to the audit buffer on success, NULL on failure.
1471  *
1472  */
1473 struct audit_buffer *netlbl_audit_start(int type,
1474                                         struct netlbl_audit *audit_info)
1475 {
1476         return netlbl_audit_start_common(type, audit_info);
1477 }
1478 EXPORT_SYMBOL(netlbl_audit_start);
1479 
1480 /*
1481  * Setup Functions
1482  */
1483 
1484 /**
1485  * netlbl_init - Initialize NetLabel
1486  *
1487  * Description:
1488  * Perform the required NetLabel initialization before first use.
1489  *
1490  */
1491 static int __init netlbl_init(void)
1492 {
1493         int ret_val;
1494 
1495         printk(KERN_INFO "NetLabel: Initializing\n");
1496         printk(KERN_INFO "NetLabel:  domain hash size = %u\n",
1497                (1 << NETLBL_DOMHSH_BITSIZE));
1498         printk(KERN_INFO "NetLabel:  protocols = UNLABELED CIPSOv4 CALIPSO\n");
1499 
1500         ret_val = netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE);
1501         if (ret_val != 0)
1502                 goto init_failure;
1503 
1504         ret_val = netlbl_unlabel_init(NETLBL_UNLHSH_BITSIZE);
1505         if (ret_val != 0)
1506                 goto init_failure;
1507 
1508         ret_val = netlbl_netlink_init();
1509         if (ret_val != 0)
1510                 goto init_failure;
1511 
1512         ret_val = netlbl_unlabel_defconf();
1513         if (ret_val != 0)
1514                 goto init_failure;
1515         printk(KERN_INFO "NetLabel:  unlabeled traffic allowed by default\n");
1516 
1517         return 0;
1518 
1519 init_failure:
1520         panic("NetLabel: failed to initialize properly (%d)\n", ret_val);
1521 }
1522 
1523 subsys_initcall(netlbl_init);