net/netlabel/netlabel_kapi.c

   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.moore@hp.com>
   9  *
  10  */
  11
  12 /*
  13  * (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008
  14  *
  15  * This program is free software;  you can redistribute it and/or modify
  16  * it under the terms of the GNU General Public License as published by
  17  * the Free Software Foundation; either version 2 of the License, or
  18  * (at your option) any later version.
  19  *
  20  * This program is distributed in the hope that it will be useful,
  21  * but WITHOUT ANY WARRANTY;  without even the implied warranty of
  22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  23  * the GNU General Public License for more details.
  24  *
  25  * You should have received a copy of the GNU General Public License
  26  * along with this program;  if not, write to the Free Software
  27  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  28  *
  29  */
  30
  31 #include <linux/init.h>
  32 #include <linux/types.h>
  33 #include <linux/slab.h>
  34 #include <linux/audit.h>
  35 #include <linux/in.h>
  36 #include <linux/in6.h>
  37 #include <net/ip.h>
  38 #include <net/ipv6.h>
  39 #include <net/netlabel.h>
  40 #include <net/cipso_ipv4.h>
  41 #include <asm/bug.h>
  42 #include <linux/atomic.h>
  43
  44 #include "netlabel_domainhash.h"
  45 #include "netlabel_unlabeled.h"
  46 #include "netlabel_cipso_v4.h"
  47 #include "netlabel_user.h"
  48 #include "netlabel_mgmt.h"
  49 #include "netlabel_addrlist.h"
  50
  51 /*
  52  * Configuration Functions
  53  */
  54
  55 /**
  56  * netlbl_cfg_map_del - Remove a NetLabel/LSM domain mapping
  57  * @domain: the domain mapping to remove
  58  * @family: address family
  59  * @addr: IP address
  60  * @mask: IP address mask
  61  * @audit_info: NetLabel audit information
  62  *
  63  * Description:
  64  * Removes a NetLabel/LSM domain mapping.  A @domain value of NULL causes the
  65  * default domain mapping to be removed.  Returns zero on success, negative
  66  * values on failure.
  67  *
  68  */
  69 int netlbl_cfg_map_del(const char *domain,
  70                        u16 family,
  71                        const void *addr,
  72                        const void *mask,
  73                        struct netlbl_audit *audit_info)
  74 {
  75         if (addr == NULL && mask == NULL) {
  76                 return netlbl_domhsh_remove(domain, audit_info);
  77         } else if (addr != NULL && mask != NULL) {
  78                 switch (family) {
  79                 case AF_INET:
  80                         return netlbl_domhsh_remove_af4(domain, addr, mask,
  81                                                         audit_info);
  82                 default:
  83                         return -EPFNOSUPPORT;
  84                 }
  85         } else
  86                 return -EINVAL;
  87 }
  88
  89 /**
  90  * netlbl_cfg_unlbl_map_add - Add a new unlabeled mapping
  91  * @domain: the domain mapping to add
  92  * @family: address family
  93  * @addr: IP address
  94  * @mask: IP address mask
  95  * @audit_info: NetLabel audit information
  96  *
  97  * Description:
  98  * Adds a new unlabeled NetLabel/LSM domain mapping.  A @domain value of NULL
  99  * causes a new default domain mapping to be added.  Returns zero on success,
 100  * negative values on failure.
 101  *
 102  */
 103 int netlbl_cfg_unlbl_map_add(const char *domain,
 104                              u16 family,
 105                              const void *addr,
 106                              const void *mask,
 107                              struct netlbl_audit *audit_info)
 108 {
 109         int ret_val = -ENOMEM;
 110         struct netlbl_dom_map *entry;
 111         struct netlbl_domaddr_map *addrmap = NULL;
 112         struct netlbl_domaddr4_map *map4 = NULL;
 113         struct netlbl_domaddr6_map *map6 = NULL;
 114         const struct in_addr *addr4, *mask4;
 115         const struct in6_addr *addr6, *mask6;
 116
 117         entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
 118         if (entry == NULL)
 119                 return -ENOMEM;
 120         if (domain != NULL) {
 121                 entry->domain = kstrdup(domain, GFP_ATOMIC);
 122                 if (entry->domain == NULL)
 123                         goto cfg_unlbl_map_add_failure;
 124         }
 125
 126         if (addr == NULL && mask == NULL)
 127                 entry->type = NETLBL_NLTYPE_UNLABELED;
 128         else if (addr != NULL && mask != NULL) {
 129                 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
 130                 if (addrmap == NULL)
 131                         goto cfg_unlbl_map_add_failure;
 132                 INIT_LIST_HEAD(&addrmap->list4);
 133                 INIT_LIST_HEAD(&addrmap->list6);
 134
 135                 switch (family) {
 136                 case AF_INET:
 137                         addr4 = addr;
 138                         mask4 = mask;
 139                         map4 = kzalloc(sizeof(*map4), GFP_ATOMIC);
 140                         if (map4 == NULL)
 141                                 goto cfg_unlbl_map_add_failure;
 142                         map4->type = NETLBL_NLTYPE_UNLABELED;
 143                         map4->list.addr = addr4->s_addr & mask4->s_addr;
 144                         map4->list.mask = mask4->s_addr;
 145                         map4->list.valid = 1;
 146                         ret_val = netlbl_af4list_add(&map4->list,
 147                                                      &addrmap->list4);
 148                         if (ret_val != 0)
 149                                 goto cfg_unlbl_map_add_failure;
 150                         break;
 151                 case AF_INET6:
 152                         addr6 = addr;
 153                         mask6 = mask;
 154                         map6 = kzalloc(sizeof(*map6), GFP_ATOMIC);
 155                         if (map6 == NULL)
 156                                 goto cfg_unlbl_map_add_failure;
 157                         map6->type = NETLBL_NLTYPE_UNLABELED;
 158                         ipv6_addr_copy(&map6->list.addr, addr6);
 159                         map6->list.addr.s6_addr32[0] &= mask6->s6_addr32[0];
 160                         map6->list.addr.s6_addr32[1] &= mask6->s6_addr32[1];
 161                         map6->list.addr.s6_addr32[2] &= mask6->s6_addr32[2];
 162                         map6->list.addr.s6_addr32[3] &= mask6->s6_addr32[3];
 163                         ipv6_addr_copy(&map6->list.mask, mask6);
 164                         map6->list.valid = 1;
 165                         ret_val = netlbl_af4list_add(&map4->list,
 166                                                      &addrmap->list4);
 167                         if (ret_val != 0)
 168                                 goto cfg_unlbl_map_add_failure;
 169                         break;
 170                 default:
 171                         goto cfg_unlbl_map_add_failure;
 172                         break;
 173                 }
 174
 175                 entry->type_def.addrsel = addrmap;
 176                 entry->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         case AF_INET6:
 229                 addr_len = sizeof(struct in6_addr);
 230                 break;
 231         default:
 232                 return -EPFNOSUPPORT;
 233         }
 234
 235         return netlbl_unlhsh_add(net,
 236                                  dev_name, addr, mask, addr_len,
 237                                  secid, audit_info);
 238 }
 239
 240 /**
 241  * netlbl_cfg_unlbl_static_del - Removes an existing static label
 242  * @net: network namespace
 243  * @dev_name: interface name
 244  * @addr: IP address in network byte order (struct in[6]_addr)
 245  * @mask: address mask in network byte order (struct in[6]_addr)
 246  * @family: address family
 247  * @secid: LSM secid value for the entry
 248  * @audit_info: NetLabel audit information
 249  *
 250  * Description:
 251  * Removes an existing NetLabel static label used when protocol provided labels
 252  * are not present on incoming traffic.  If @dev_name is NULL then the default
 253  * interface will be used.  Returns zero on success, negative values on failure.
 254  *
 255  */
 256 int netlbl_cfg_unlbl_static_del(struct net *net,
 257                                 const char *dev_name,
 258                                 const void *addr,
 259                                 const void *mask,
 260                                 u16 family,
 261                                 struct netlbl_audit *audit_info)
 262 {
 263         u32 addr_len;
 264
 265         switch (family) {
 266         case AF_INET:
 267                 addr_len = sizeof(struct in_addr);
 268                 break;
 269         case AF_INET6:
 270                 addr_len = sizeof(struct in6_addr);
 271                 break;
 272         default:
 273                 return -EPFNOSUPPORT;
 274         }
 275
 276         return netlbl_unlhsh_remove(net,
 277                                     dev_name, addr, mask, addr_len,
 278                                     audit_info);
 279 }
 280
 281 /**
 282  * netlbl_cfg_cipsov4_add - Add a new CIPSOv4 DOI definition
 283  * @doi_def: CIPSO DOI definition
 284  * @audit_info: NetLabel audit information
 285  *
 286  * Description:
 287  * Add a new CIPSO DOI definition as defined by @doi_def.  Returns zero on
 288  * success and negative values on failure.
 289  *
 290  */
 291 int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def,
 292                            struct netlbl_audit *audit_info)
 293 {
 294         return cipso_v4_doi_add(doi_def, audit_info);
 295 }
 296
 297 /**
 298  * netlbl_cfg_cipsov4_del - Remove an existing CIPSOv4 DOI definition
 299  * @doi: CIPSO DOI
 300  * @audit_info: NetLabel audit information
 301  *
 302  * Description:
 303  * Remove an existing CIPSO DOI definition matching @doi.  Returns zero on
 304  * success and negative values on failure.
 305  *
 306  */
 307 void netlbl_cfg_cipsov4_del(u32 doi, struct netlbl_audit *audit_info)
 308 {
 309         cipso_v4_doi_remove(doi, audit_info);
 310 }
 311
 312 /**
 313  * netlbl_cfg_cipsov4_map_add - Add a new CIPSOv4 DOI mapping
 314  * @doi: the CIPSO DOI
 315  * @domain: the domain mapping to add
 316  * @addr: IP address
 317  * @mask: IP address mask
 318  * @audit_info: NetLabel audit information
 319  *
 320  * Description:
 321  * Add a new NetLabel/LSM domain mapping for the given CIPSO DOI to the NetLabel
 322  * subsystem.  A @domain value of NULL adds a new default domain mapping.
 323  * Returns zero on success, negative values on failure.
 324  *
 325  */
 326 int netlbl_cfg_cipsov4_map_add(u32 doi,
 327                                const char *domain,
 328                                const struct in_addr *addr,
 329                                const struct in_addr *mask,
 330                                struct netlbl_audit *audit_info)
 331 {
 332         int ret_val = -ENOMEM;
 333         struct cipso_v4_doi *doi_def;
 334         struct netlbl_dom_map *entry;
 335         struct netlbl_domaddr_map *addrmap = NULL;
 336         struct netlbl_domaddr4_map *addrinfo = NULL;
 337
 338         doi_def = cipso_v4_doi_getdef(doi);
 339         if (doi_def == NULL)
 340                 return -ENOENT;
 341
 342         entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
 343         if (entry == NULL)
 344                 return -ENOMEM;
 345         if (domain != NULL) {
 346                 entry->domain = kstrdup(domain, GFP_ATOMIC);
 347                 if (entry->domain == NULL)
 348                         goto cfg_cipsov4_map_add_failure;
 349         }
 350
 351         if (addr == NULL && mask == NULL) {
 352                 entry->type_def.cipsov4 = doi_def;
 353                 entry->type = NETLBL_NLTYPE_CIPSOV4;
 354         } else if (addr != NULL && mask != NULL) {
 355                 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
 356                 if (addrmap == NULL)
 357                         goto cfg_cipsov4_map_add_failure;
 358                 INIT_LIST_HEAD(&addrmap->list4);
 359                 INIT_LIST_HEAD(&addrmap->list6);
 360
 361                 addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC);
 362                 if (addrinfo == NULL)
 363                         goto cfg_cipsov4_map_add_failure;
 364                 addrinfo->type_def.cipsov4 = doi_def;
 365                 addrinfo->type = NETLBL_NLTYPE_CIPSOV4;
 366                 addrinfo->list.addr = addr->s_addr & mask->s_addr;
 367                 addrinfo->list.mask = mask->s_addr;
 368                 addrinfo->list.valid = 1;
 369                 ret_val = netlbl_af4list_add(&addrinfo->list, &addrmap->list4);
 370                 if (ret_val != 0)
 371                         goto cfg_cipsov4_map_add_failure;
 372
 373                 entry->type_def.addrsel = addrmap;
 374                 entry->type = NETLBL_NLTYPE_ADDRSELECT;
 375         } else {
 376                 ret_val = -EINVAL;
 377                 goto cfg_cipsov4_map_add_failure;
 378         }
 379
 380         ret_val = netlbl_domhsh_add(entry, audit_info);
 381         if (ret_val != 0)
 382                 goto cfg_cipsov4_map_add_failure;
 383
 384         return 0;
 385
 386 cfg_cipsov4_map_add_failure:
 387         cipso_v4_doi_putdef(doi_def);
 388         kfree(entry->domain);
 389         kfree(entry);
 390         kfree(addrmap);
 391         kfree(addrinfo);
 392         return ret_val;
 393 }
 394
 395 /*
 396  * Security Attribute Functions
 397  */
 398
 399 /**
 400  * netlbl_secattr_catmap_walk - Walk a LSM secattr catmap looking for a bit
 401  * @catmap: the category bitmap
 402  * @offset: the offset to start searching at, in bits
 403  *
 404  * Description:
 405  * This function walks a LSM secattr category bitmap starting at @offset and
 406  * returns the spot of the first set bit or -ENOENT if no bits are set.
 407  *
 408  */
 409 int netlbl_secattr_catmap_walk(struct netlbl_lsm_secattr_catmap *catmap,
 410                                u32 offset)
 411 {
 412         struct netlbl_lsm_secattr_catmap *iter = catmap;
 413         u32 node_idx;
 414         u32 node_bit;
 415         NETLBL_CATMAP_MAPTYPE bitmap;
 416
 417         if (offset > iter->startbit) {
 418                 while (offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
 419                         iter = iter->next;
 420                         if (iter == NULL)
 421                                 return -ENOENT;
 422                 }
 423                 node_idx = (offset - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
 424                 node_bit = offset - iter->startbit -
 425                            (NETLBL_CATMAP_MAPSIZE * node_idx);
 426         } else {
 427                 node_idx = 0;
 428                 node_bit = 0;
 429         }
 430         bitmap = iter->bitmap[node_idx] >> node_bit;
 431
 432         for (;;) {
 433                 if (bitmap != 0) {
 434                         while ((bitmap & NETLBL_CATMAP_BIT) == 0) {
 435                                 bitmap >>= 1;
 436                                 node_bit++;
 437                         }
 438                         return iter->startbit +
 439                                 (NETLBL_CATMAP_MAPSIZE * node_idx) + node_bit;
 440                 }
 441                 if (++node_idx >= NETLBL_CATMAP_MAPCNT) {
 442                         if (iter->next != NULL) {
 443                                 iter = iter->next;
 444                                 node_idx = 0;
 445                         } else
 446                                 return -ENOENT;
 447                 }
 448                 bitmap = iter->bitmap[node_idx];
 449                 node_bit = 0;
 450         }
 451
 452         return -ENOENT;
 453 }
 454
 455 /**
 456  * netlbl_secattr_catmap_walk_rng - Find the end of a string of set bits
 457  * @catmap: the category bitmap
 458  * @offset: the offset to start searching at, in bits
 459  *
 460  * Description:
 461  * This function walks a LSM secattr category bitmap starting at @offset and
 462  * returns the spot of the first cleared bit or -ENOENT if the offset is past
 463  * the end of the bitmap.
 464  *
 465  */
 466 int netlbl_secattr_catmap_walk_rng(struct netlbl_lsm_secattr_catmap *catmap,
 467                                    u32 offset)
 468 {
 469         struct netlbl_lsm_secattr_catmap *iter = catmap;
 470         u32 node_idx;
 471         u32 node_bit;
 472         NETLBL_CATMAP_MAPTYPE bitmask;
 473         NETLBL_CATMAP_MAPTYPE bitmap;
 474
 475         if (offset > iter->startbit) {
 476                 while (offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
 477                         iter = iter->next;
 478                         if (iter == NULL)
 479                                 return -ENOENT;
 480                 }
 481                 node_idx = (offset - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
 482                 node_bit = offset - iter->startbit -
 483                            (NETLBL_CATMAP_MAPSIZE * node_idx);
 484         } else {
 485                 node_idx = 0;
 486                 node_bit = 0;
 487         }
 488         bitmask = NETLBL_CATMAP_BIT << node_bit;
 489
 490         for (;;) {
 491                 bitmap = iter->bitmap[node_idx];
 492                 while (bitmask != 0 && (bitmap & bitmask) != 0) {
 493                         bitmask <<= 1;
 494                         node_bit++;
 495                 }
 496
 497                 if (bitmask != 0)
 498                         return iter->startbit +
 499                                 (NETLBL_CATMAP_MAPSIZE * node_idx) +
 500                                 node_bit - 1;
 501                 else if (++node_idx >= NETLBL_CATMAP_MAPCNT) {
 502                         if (iter->next == NULL)
 503                                 return iter->startbit + NETLBL_CATMAP_SIZE - 1;
 504                         iter = iter->next;
 505                         node_idx = 0;
 506                 }
 507                 bitmask = NETLBL_CATMAP_BIT;
 508                 node_bit = 0;
 509         }
 510
 511         return -ENOENT;
 512 }
 513
 514 /**
 515  * netlbl_secattr_catmap_setbit - Set a bit in a LSM secattr catmap
 516  * @catmap: the category bitmap
 517  * @bit: the bit to set
 518  * @flags: memory allocation flags
 519  *
 520  * Description:
 521  * Set the bit specified by @bit in @catmap.  Returns zero on success,
 522  * negative values on failure.
 523  *
 524  */
 525 int netlbl_secattr_catmap_setbit(struct netlbl_lsm_secattr_catmap *catmap,
 526                                  u32 bit,
 527                                  gfp_t flags)
 528 {
 529         struct netlbl_lsm_secattr_catmap *iter = catmap;
 530         u32 node_bit;
 531         u32 node_idx;
 532
 533         while (iter->next != NULL &&
 534                bit >= (iter->startbit + NETLBL_CATMAP_SIZE))
 535                 iter = iter->next;
 536         if (bit >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
 537                 iter->next = netlbl_secattr_catmap_alloc(flags);
 538                 if (iter->next == NULL)
 539                         return -ENOMEM;
 540                 iter = iter->next;
 541                 iter->startbit = bit & ~(NETLBL_CATMAP_SIZE - 1);
 542         }
 543
 544         /* gcc always rounds to zero when doing integer division */
 545         node_idx = (bit - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
 546         node_bit = bit - iter->startbit - (NETLBL_CATMAP_MAPSIZE * node_idx);
 547         iter->bitmap[node_idx] |= NETLBL_CATMAP_BIT << node_bit;
 548
 549         return 0;
 550 }
 551
 552 /**
 553  * netlbl_secattr_catmap_setrng - Set a range of bits in a LSM secattr catmap
 554  * @catmap: the category bitmap
 555  * @start: the starting bit
 556  * @end: the last bit in the string
 557  * @flags: memory allocation flags
 558  *
 559  * Description:
 560  * Set a range of bits, starting at @start and ending with @end.  Returns zero
 561  * on success, negative values on failure.
 562  *
 563  */
 564 int netlbl_secattr_catmap_setrng(struct netlbl_lsm_secattr_catmap *catmap,
 565                                  u32 start,
 566                                  u32 end,
 567                                  gfp_t flags)
 568 {
 569         int ret_val = 0;
 570         struct netlbl_lsm_secattr_catmap *iter = catmap;
 571         u32 iter_max_spot;
 572         u32 spot;
 573
 574         /* XXX - This could probably be made a bit faster by combining writes
 575          * to the catmap instead of setting a single bit each time, but for
 576          * right now skipping to the start of the range in the catmap should
 577          * be a nice improvement over calling the individual setbit function
 578          * repeatedly from a loop. */
 579
 580         while (iter->next != NULL &&
 581                start >= (iter->startbit + NETLBL_CATMAP_SIZE))
 582                 iter = iter->next;
 583         iter_max_spot = iter->startbit + NETLBL_CATMAP_SIZE;
 584
 585         for (spot = start; spot <= end && ret_val == 0; spot++) {
 586                 if (spot >= iter_max_spot && iter->next != NULL) {
 587                         iter = iter->next;
 588                         iter_max_spot = iter->startbit + NETLBL_CATMAP_SIZE;
 589                 }
 590                 ret_val = netlbl_secattr_catmap_setbit(iter, spot, GFP_ATOMIC);
 591         }
 592
 593         return ret_val;
 594 }
 595
 596 /*
 597  * LSM Functions
 598  */
 599
 600 /**
 601  * netlbl_enabled - Determine if the NetLabel subsystem is enabled
 602  *
 603  * Description:
 604  * The LSM can use this function to determine if it should use NetLabel
 605  * security attributes in it's enforcement mechanism.  Currently, NetLabel is
 606  * considered to be enabled when it's configuration contains a valid setup for
 607  * at least one labeled protocol (i.e. NetLabel can understand incoming
 608  * labeled packets of at least one type); otherwise NetLabel is considered to
 609  * be disabled.
 610  *
 611  */
 612 int netlbl_enabled(void)
 613 {
 614         /* At some point we probably want to expose this mechanism to the user
 615          * as well so that admins can toggle NetLabel regardless of the
 616          * configuration */
 617         return (atomic_read(&netlabel_mgmt_protocount) > 0);
 618 }
 619
 620 /**
 621  * netlbl_sock_setattr - Label a socket using the correct protocol
 622  * @sk: the socket to label
 623  * @family: protocol family
 624  * @secattr: the security attributes
 625  *
 626  * Description:
 627  * Attach the correct label to the given socket using the security attributes
 628  * specified in @secattr.  This function requires exclusive access to @sk,
 629  * which means it either needs to be in the process of being created or locked.
 630  * Returns zero on success, -EDESTADDRREQ if the domain is configured to use
 631  * network address selectors (can't blindly label the socket), and negative
 632  * values on all other failures.
 633  *
 634  */
 635 int netlbl_sock_setattr(struct sock *sk,
 636                         u16 family,
 637                         const struct netlbl_lsm_secattr *secattr)
 638 {
 639         int ret_val;
 640         struct netlbl_dom_map *dom_entry;
 641
 642         rcu_read_lock();
 643         dom_entry = netlbl_domhsh_getentry(secattr->domain);
 644         if (dom_entry == NULL) {
 645                 ret_val = -ENOENT;
 646                 goto socket_setattr_return;
 647         }
 648         switch (family) {
 649         case AF_INET:
 650                 switch (dom_entry->type) {
 651                 case NETLBL_NLTYPE_ADDRSELECT:
 652                         ret_val = -EDESTADDRREQ;
 653                         break;
 654                 case NETLBL_NLTYPE_CIPSOV4:
 655                         ret_val = cipso_v4_sock_setattr(sk,
 656                                                     dom_entry->type_def.cipsov4,
 657                                                     secattr);
 658                         break;
 659                 case NETLBL_NLTYPE_UNLABELED:
 660                         ret_val = 0;
 661                         break;
 662                 default:
 663                         ret_val = -ENOENT;
 664                 }
 665                 break;
 666 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 667         case AF_INET6:
 668                 /* since we don't support any IPv6 labeling protocols right
 669                  * now we can optimize everything away until we do */
 670                 ret_val = 0;
 671                 break;
 672 #endif /* IPv6 */
 673         default:
 674                 ret_val = -EPROTONOSUPPORT;
 675         }
 676
 677 socket_setattr_return:
 678         rcu_read_unlock();
 679         return ret_val;
 680 }
 681
 682 /**
 683  * netlbl_sock_delattr - Delete all the NetLabel labels on a socket
 684  * @sk: the socket
 685  *
 686  * Description:
 687  * Remove all the NetLabel labeling from @sk.  The caller is responsible for
 688  * ensuring that @sk is locked.
 689  *
 690  */
 691 void netlbl_sock_delattr(struct sock *sk)
 692 {
 693         cipso_v4_sock_delattr(sk);
 694 }
 695
 696 /**
 697  * netlbl_sock_getattr - Determine the security attributes of a sock
 698  * @sk: the sock
 699  * @secattr: the security attributes
 700  *
 701  * Description:
 702  * Examines the given sock to see if any NetLabel style labeling has been
 703  * applied to the sock, if so it parses the socket label and returns the
 704  * security attributes in @secattr.  Returns zero on success, negative values
 705  * on failure.
 706  *
 707  */
 708 int netlbl_sock_getattr(struct sock *sk,
 709                         struct netlbl_lsm_secattr *secattr)
 710 {
 711         int ret_val;
 712
 713         switch (sk->sk_family) {
 714         case AF_INET:
 715                 ret_val = cipso_v4_sock_getattr(sk, secattr);
 716                 break;
 717 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 718         case AF_INET6:
 719                 ret_val = -ENOMSG;
 720                 break;
 721 #endif /* IPv6 */
 722         default:
 723                 ret_val = -EPROTONOSUPPORT;
 724         }
 725
 726         return ret_val;
 727 }
 728
 729 /**
 730  * netlbl_conn_setattr - Label a connected socket using the correct protocol
 731  * @sk: the socket to label
 732  * @addr: the destination address
 733  * @secattr: the security attributes
 734  *
 735  * Description:
 736  * Attach the correct label to the given connected socket using the security
 737  * attributes specified in @secattr.  The caller is responsible for ensuring
 738  * that @sk is locked.  Returns zero on success, negative values on failure.
 739  *
 740  */
 741 int netlbl_conn_setattr(struct sock *sk,
 742                         struct sockaddr *addr,
 743                         const struct netlbl_lsm_secattr *secattr)
 744 {
 745         int ret_val;
 746         struct sockaddr_in *addr4;
 747         struct netlbl_domaddr4_map *af4_entry;
 748
 749         rcu_read_lock();
 750         switch (addr->sa_family) {
 751         case AF_INET:
 752                 addr4 = (struct sockaddr_in *)addr;
 753                 af4_entry = netlbl_domhsh_getentry_af4(secattr->domain,
 754                                                        addr4->sin_addr.s_addr);
 755                 if (af4_entry == NULL) {
 756                         ret_val = -ENOENT;
 757                         goto conn_setattr_return;
 758                 }
 759                 switch (af4_entry->type) {
 760                 case NETLBL_NLTYPE_CIPSOV4:
 761                         ret_val = cipso_v4_sock_setattr(sk,
 762                                                    af4_entry->type_def.cipsov4,
 763                                                    secattr);
 764                         break;
 765                 case NETLBL_NLTYPE_UNLABELED:
 766                         /* just delete the protocols we support for right now
 767                          * but we could remove other protocols if needed */
 768                         cipso_v4_sock_delattr(sk);
 769                         ret_val = 0;
 770                         break;
 771                 default:
 772                         ret_val = -ENOENT;
 773                 }
 774                 break;
 775 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 776         case AF_INET6:
 777                 /* since we don't support any IPv6 labeling protocols right
 778                  * now we can optimize everything away until we do */
 779                 ret_val = 0;
 780                 break;
 781 #endif /* IPv6 */
 782         default:
 783                 ret_val = -EPROTONOSUPPORT;
 784         }
 785
 786 conn_setattr_return:
 787         rcu_read_unlock();
 788         return ret_val;
 789 }
 790
 791 /**
 792  * netlbl_req_setattr - Label a request socket using the correct protocol
 793  * @req: the request socket to label
 794  * @secattr: the security attributes
 795  *
 796  * Description:
 797  * Attach the correct label to the given socket using the security attributes
 798  * specified in @secattr.  Returns zero on success, negative values on failure.
 799  *
 800  */
 801 int netlbl_req_setattr(struct request_sock *req,
 802                        const struct netlbl_lsm_secattr *secattr)
 803 {
 804         int ret_val;
 805         struct netlbl_dom_map *dom_entry;
 806         struct netlbl_domaddr4_map *af4_entry;
 807         u32 proto_type;
 808         struct cipso_v4_doi *proto_cv4;
 809
 810         rcu_read_lock();
 811         dom_entry = netlbl_domhsh_getentry(secattr->domain);
 812         if (dom_entry == NULL) {
 813                 ret_val = -ENOENT;
 814                 goto req_setattr_return;
 815         }
 816         switch (req->rsk_ops->family) {
 817         case AF_INET:
 818                 if (dom_entry->type == NETLBL_NLTYPE_ADDRSELECT) {
 819                         struct inet_request_sock *req_inet = inet_rsk(req);
 820                         af4_entry = netlbl_domhsh_getentry_af4(secattr->domain,
 821                                                             req_inet->rmt_addr);
 822                         if (af4_entry == NULL) {
 823                                 ret_val = -ENOENT;
 824                                 goto req_setattr_return;
 825                         }
 826                         proto_type = af4_entry->type;
 827                         proto_cv4 = af4_entry->type_def.cipsov4;
 828                 } else {
 829                         proto_type = dom_entry->type;
 830                         proto_cv4 = dom_entry->type_def.cipsov4;
 831                 }
 832                 switch (proto_type) {
 833                 case NETLBL_NLTYPE_CIPSOV4:
 834                         ret_val = cipso_v4_req_setattr(req, proto_cv4, secattr);
 835                         break;
 836                 case NETLBL_NLTYPE_UNLABELED:
 837                         /* just delete the protocols we support for right now
 838                          * but we could remove other protocols if needed */
 839                         cipso_v4_req_delattr(req);
 840                         ret_val = 0;
 841                         break;
 842                 default:
 843                         ret_val = -ENOENT;
 844                 }
 845                 break;
 846 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 847         case AF_INET6:
 848                 /* since we don't support any IPv6 labeling protocols right
 849                  * now we can optimize everything away until we do */
 850                 ret_val = 0;
 851                 break;
 852 #endif /* IPv6 */
 853         default:
 854                 ret_val = -EPROTONOSUPPORT;
 855         }
 856
 857 req_setattr_return:
 858         rcu_read_unlock();
 859         return ret_val;
 860 }
 861
 862 /**
 863 * netlbl_req_delattr - Delete all the NetLabel labels on a socket
 864 * @req: the socket
 865 *
 866 * Description:
 867 * Remove all the NetLabel labeling from @req.
 868 *
 869 */
 870 void netlbl_req_delattr(struct request_sock *req)
 871 {
 872         cipso_v4_req_delattr(req);
 873 }
 874
 875 /**
 876  * netlbl_skbuff_setattr - Label a packet using the correct protocol
 877  * @skb: the packet
 878  * @family: protocol family
 879  * @secattr: the security attributes
 880  *
 881  * Description:
 882  * Attach the correct label to the given packet using the security attributes
 883  * specified in @secattr.  Returns zero on success, negative values on failure.
 884  *
 885  */
 886 int netlbl_skbuff_setattr(struct sk_buff *skb,
 887                           u16 family,
 888                           const struct netlbl_lsm_secattr *secattr)
 889 {
 890         int ret_val;
 891         struct iphdr *hdr4;
 892         struct netlbl_domaddr4_map *af4_entry;
 893
 894         rcu_read_lock();
 895         switch (family) {
 896         case AF_INET:
 897                 hdr4 = ip_hdr(skb);
 898                 af4_entry = netlbl_domhsh_getentry_af4(secattr->domain,
 899                                                        hdr4->daddr);
 900                 if (af4_entry == NULL) {
 901                         ret_val = -ENOENT;
 902                         goto skbuff_setattr_return;
 903                 }
 904                 switch (af4_entry->type) {
 905                 case NETLBL_NLTYPE_CIPSOV4:
 906                         ret_val = cipso_v4_skbuff_setattr(skb,
 907                                                    af4_entry->type_def.cipsov4,
 908                                                    secattr);
 909                         break;
 910                 case NETLBL_NLTYPE_UNLABELED:
 911                         /* just delete the protocols we support for right now
 912                          * but we could remove other protocols if needed */
 913                         ret_val = cipso_v4_skbuff_delattr(skb);
 914                         break;
 915                 default:
 916                         ret_val = -ENOENT;
 917                 }
 918                 break;
 919 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 920         case AF_INET6:
 921                 /* since we don't support any IPv6 labeling protocols right
 922                  * now we can optimize everything away until we do */
 923                 ret_val = 0;
 924                 break;
 925 #endif /* IPv6 */
 926         default:
 927                 ret_val = -EPROTONOSUPPORT;
 928         }
 929
 930 skbuff_setattr_return:
 931         rcu_read_unlock();
 932         return ret_val;
 933 }
 934
 935 /**
 936  * netlbl_skbuff_getattr - Determine the security attributes of a packet
 937  * @skb: the packet
 938  * @family: protocol family
 939  * @secattr: the security attributes
 940  *
 941  * Description:
 942  * Examines the given packet to see if a recognized form of packet labeling
 943  * is present, if so it parses the packet label and returns the security
 944  * attributes in @secattr.  Returns zero on success, negative values on
 945  * failure.
 946  *
 947  */
 948 int netlbl_skbuff_getattr(const struct sk_buff *skb,
 949                           u16 family,
 950                           struct netlbl_lsm_secattr *secattr)
 951 {
 952         switch (family) {
 953         case AF_INET:
 954                 if (CIPSO_V4_OPTEXIST(skb) &&
 955                     cipso_v4_skbuff_getattr(skb, secattr) == 0)
 956                         return 0;
 957                 break;
 958 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 959         case AF_INET6:
 960                 break;
 961 #endif /* IPv6 */
 962         }
 963
 964         return netlbl_unlabel_getattr(skb, family, secattr);
 965 }
 966
 967 /**
 968  * netlbl_skbuff_err - Handle a LSM error on a sk_buff
 969  * @skb: the packet
 970  * @error: the error code
 971  * @gateway: true if host is acting as a gateway, false otherwise
 972  *
 973  * Description:
 974  * Deal with a LSM problem when handling the packet in @skb, typically this is
 975  * a permission denied problem (-EACCES).  The correct action is determined
 976  * according to the packet's labeling protocol.
 977  *
 978  */
 979 void netlbl_skbuff_err(struct sk_buff *skb, int error, int gateway)
 980 {
 981         if (CIPSO_V4_OPTEXIST(skb))
 982                 cipso_v4_error(skb, error, gateway);
 983 }
 984
 985 /**
 986  * netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches
 987  *
 988  * Description:
 989  * For all of the NetLabel protocols that support some form of label mapping
 990  * cache, invalidate the cache.  Returns zero on success, negative values on
 991  * error.
 992  *
 993  */
 994 void netlbl_cache_invalidate(void)
 995 {
 996         cipso_v4_cache_invalidate();
 997 }
 998
 999 /**
1000  * netlbl_cache_add - Add an entry to a NetLabel protocol cache
1001  * @skb: the packet
1002  * @secattr: the packet's security attributes
1003  *
1004  * Description:
1005  * Add the LSM security attributes for the given packet to the underlying
1006  * NetLabel protocol's label mapping cache.  Returns zero on success, negative
1007  * values on error.
1008  *
1009  */
1010 int netlbl_cache_add(const struct sk_buff *skb,
1011                      const struct netlbl_lsm_secattr *secattr)
1012 {
1013         if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0)
1014                 return -ENOMSG;
1015
1016         if (CIPSO_V4_OPTEXIST(skb))
1017                 return cipso_v4_cache_add(skb, secattr);
1018
1019         return -ENOMSG;
1020 }
1021
1022 /*
1023  * Protocol Engine Functions
1024  */
1025
1026 /**
1027  * netlbl_audit_start - Start an audit message
1028  * @type: audit message type
1029  * @audit_info: NetLabel audit information
1030  *
1031  * Description:
1032  * Start an audit message using the type specified in @type and fill the audit
1033  * message with some fields common to all NetLabel audit messages.  This
1034  * function should only be used by protocol engines, not LSMs.  Returns a
1035  * pointer to the audit buffer on success, NULL on failure.
1036  *
1037  */
1038 struct audit_buffer *netlbl_audit_start(int type,
1039                                         struct netlbl_audit *audit_info)
1040 {
1041         return netlbl_audit_start_common(type, audit_info);
1042 }
1043
1044 /*
1045  * Setup Functions
1046  */
1047
1048 /**
1049  * netlbl_init - Initialize NetLabel
1050  *
1051  * Description:
1052  * Perform the required NetLabel initialization before first use.
1053  *
1054  */
1055 static int __init netlbl_init(void)
1056 {
1057         int ret_val;
1058
1059         printk(KERN_INFO "NetLabel: Initializing\n");
1060         printk(KERN_INFO "NetLabel:  domain hash size = %u\n",
1061                (1 << NETLBL_DOMHSH_BITSIZE));
1062         printk(KERN_INFO "NetLabel:  protocols ="
1063                " UNLABELED"
1064                " CIPSOv4"
1065                "\n");
1066
1067         ret_val = netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE);
1068         if (ret_val != 0)
1069                 goto init_failure;
1070
1071         ret_val = netlbl_unlabel_init(NETLBL_UNLHSH_BITSIZE);
1072         if (ret_val != 0)
1073                 goto init_failure;
1074
1075         ret_val = netlbl_netlink_init();
1076         if (ret_val != 0)
1077                 goto init_failure;
1078
1079         ret_val = netlbl_unlabel_defconf();
1080         if (ret_val != 0)
1081                 goto init_failure;
1082         printk(KERN_INFO "NetLabel:  unlabeled traffic allowed by default\n");
1083
1084         return 0;
1085
1086 init_failure:
1087         panic("NetLabel: failed to initialize properly (%d)\n", ret_val);
1088 }
1089
1090 subsys_initcall(netlbl_init);