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/audit.h>
  34 #include <linux/in.h>
  35 #include <linux/in6.h>
  36 #include <net/ip.h>
  37 #include <net/ipv6.h>
  38 #include <net/netlabel.h>
  39 #include <net/cipso_ipv4.h>
  40 #include <asm/bug.h>
  41 #include <asm/atomic.h>
  42
  43 #include "netlabel_domainhash.h"
  44 #include "netlabel_unlabeled.h"
  45 #include "netlabel_cipso_v4.h"
  46 #include "netlabel_user.h"
  47 #include "netlabel_mgmt.h"
  48 #include "netlabel_addrlist.h"
  49
  50 /*
  51  * Configuration Functions
  52  */
  53
  54 /**
  55  * netlbl_cfg_map_del - Remove a NetLabel/LSM domain mapping
  56  * @domain: the domain mapping to remove
  57  * @family: address family
  58  * @addr: IP address
  59  * @mask: IP address mask
  60  * @audit_info: NetLabel audit information
  61  *
  62  * Description:
  63  * Removes a NetLabel/LSM domain mapping.  A @domain value of NULL causes the
  64  * default domain mapping to be removed.  Returns zero on success, negative
  65  * values on failure.
  66  *
  67  */
  68 int netlbl_cfg_map_del(const char *domain,
  69                        u16 family,
  70                        const void *addr,
  71                        const void *mask,
  72                        struct netlbl_audit *audit_info)
  73 {
  74         if (addr == NULL && mask == NULL) {
  75                 return netlbl_domhsh_remove(domain, audit_info);
  76         } else if (addr != NULL && mask != NULL) {
  77                 switch (family) {
  78                 case AF_INET:
  79                         return netlbl_domhsh_remove_af4(domain, addr, mask,
  80                                                         audit_info);
  81                 default:
  82                         return -EPFNOSUPPORT;
  83                 }
  84         } else
  85                 return -EINVAL;
  86 }
  87
  88 /**
  89  * netlbl_cfg_unlbl_map_add - Add a new unlabeled mapping
  90  * @domain: the domain mapping to add
  91  * @family: address family
  92  * @addr: IP address
  93  * @mask: IP address mask
  94  * @audit_info: NetLabel audit information
  95  *
  96  * Description:
  97  * Adds a new unlabeled NetLabel/LSM domain mapping.  A @domain value of NULL
  98  * causes a new default domain mapping to be added.  Returns zero on success,
  99  * negative values on failure.
 100  *
 101  */
 102 int netlbl_cfg_unlbl_map_add(const char *domain,
 103                              u16 family,
 104                              const void *addr,
 105                              const void *mask,
 106                              struct netlbl_audit *audit_info)
 107 {
 108         int ret_val = -ENOMEM;
 109         struct netlbl_dom_map *entry;
 110         struct netlbl_domaddr_map *addrmap = NULL;
 111         struct netlbl_domaddr4_map *map4 = NULL;
 112         struct netlbl_domaddr6_map *map6 = NULL;
 113         const struct in_addr *addr4, *mask4;
 114         const struct in6_addr *addr6, *mask6;
 115
 116         entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
 117         if (entry == NULL)
 118                 return -ENOMEM;
 119         if (domain != NULL) {
 120                 entry->domain = kstrdup(domain, GFP_ATOMIC);
 121                 if (entry->domain == NULL)
 122                         goto cfg_unlbl_map_add_failure;
 123         }
 124
 125         if (addr == NULL && mask == NULL)
 126                 entry->type = NETLBL_NLTYPE_UNLABELED;
 127         else if (addr != NULL && mask != NULL) {
 128                 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
 129                 if (addrmap == NULL)
 130                         goto cfg_unlbl_map_add_failure;
 131                 INIT_LIST_HEAD(&addrmap->list4);
 132                 INIT_LIST_HEAD(&addrmap->list6);
 133
 134                 switch (family) {
 135                 case AF_INET:
 136                         addr4 = addr;
 137                         mask4 = mask;
 138                         map4 = kzalloc(sizeof(*map4), GFP_ATOMIC);
 139                         if (map4 == NULL)
 140                                 goto cfg_unlbl_map_add_failure;
 141                         map4->type = NETLBL_NLTYPE_UNLABELED;
 142                         map4->list.addr = addr4->s_addr & mask4->s_addr;
 143                         map4->list.mask = mask4->s_addr;
 144                         map4->list.valid = 1;
 145                         ret_val = netlbl_af4list_add(&map4->list,
 146                                                      &addrmap->list4);
 147                         if (ret_val != 0)
 148                                 goto cfg_unlbl_map_add_failure;
 149                         break;
 150                 case AF_INET6:
 151                         addr6 = addr;
 152                         mask6 = mask;
 153                         map6 = kzalloc(sizeof(*map6), GFP_ATOMIC);
 154                         if (map6 == NULL)
 155                                 goto cfg_unlbl_map_add_failure;
 156                         map6->type = NETLBL_NLTYPE_UNLABELED;
 157                         ipv6_addr_copy(&map6->list.addr, addr6);
 158                         map6->list.addr.s6_addr32[0] &= mask6->s6_addr32[0];
 159                         map6->list.addr.s6_addr32[1] &= mask6->s6_addr32[1];
 160                         map6->list.addr.s6_addr32[2] &= mask6->s6_addr32[2];
 161                         map6->list.addr.s6_addr32[3] &= mask6->s6_addr32[3];
 162                         ipv6_addr_copy(&map6->list.mask, mask6);
 163                         map6->list.valid = 1;
 164                         ret_val = netlbl_af4list_add(&map4->list,
 165                                                      &addrmap->list4);
 166                         if (ret_val != 0)
 167                                 goto cfg_unlbl_map_add_failure;
 168                         break;
 169                 default:
 170                         goto cfg_unlbl_map_add_failure;
 171                         break;
 172                 }
 173
 174                 entry->type_def.addrsel = addrmap;
 175                 entry->type = NETLBL_NLTYPE_ADDRSELECT;
 176         } else {
 177                 ret_val = -EINVAL;
 178                 goto cfg_unlbl_map_add_failure;
 179         }
 180
 181         ret_val = netlbl_domhsh_add(entry, audit_info);
 182         if (ret_val != 0)
 183                 goto cfg_unlbl_map_add_failure;
 184
 185         return 0;
 186
 187 cfg_unlbl_map_add_failure:
 188         kfree(entry->domain);
 189         kfree(entry);
 190         kfree(addrmap);
 191         kfree(map4);
 192         kfree(map6);
 193         return ret_val;
 194 }
 195
 196
 197 /**
 198  * netlbl_cfg_unlbl_static_add - Adds a new static label
 199  * @net: network namespace
 200  * @dev_name: interface name
 201  * @addr: IP address in network byte order (struct in[6]_addr)
 202  * @mask: address mask in network byte order (struct in[6]_addr)
 203  * @family: address family
 204  * @secid: LSM secid value for the entry
 205  * @audit_info: NetLabel audit information
 206  *
 207  * Description:
 208  * Adds a new NetLabel static label to be used when protocol provided labels
 209  * are not present on incoming traffic.  If @dev_name is NULL then the default
 210  * interface will be used.  Returns zero on success, negative values on failure.
 211  *
 212  */
 213 int netlbl_cfg_unlbl_static_add(struct net *net,
 214                                 const char *dev_name,
 215                                 const void *addr,
 216                                 const void *mask,
 217                                 u16 family,
 218                                 u32 secid,
 219                                 struct netlbl_audit *audit_info)
 220 {
 221         u32 addr_len;
 222
 223         switch (family) {
 224         case AF_INET:
 225                 addr_len = sizeof(struct in_addr);
 226                 break;
 227         case AF_INET6:
 228                 addr_len = sizeof(struct in6_addr);
 229                 break;
 230         default:
 231                 return -EPFNOSUPPORT;
 232         }
 233
 234         return netlbl_unlhsh_add(net,
 235                                  dev_name, addr, mask, addr_len,
 236                                  secid, audit_info);
 237 }
 238
 239 /**
 240  * netlbl_cfg_unlbl_static_del - Removes an existing static label
 241  * @net: network namespace
 242  * @dev_name: interface name
 243  * @addr: IP address in network byte order (struct in[6]_addr)
 244  * @mask: address mask in network byte order (struct in[6]_addr)
 245  * @family: address family
 246  * @secid: LSM secid value for the entry
 247  * @audit_info: NetLabel audit information
 248  *
 249  * Description:
 250  * Removes an existing NetLabel static label used when protocol provided labels
 251  * are not present on incoming traffic.  If @dev_name is NULL then the default
 252  * interface will be used.  Returns zero on success, negative values on failure.
 253  *
 254  */
 255 int netlbl_cfg_unlbl_static_del(struct net *net,
 256                                 const char *dev_name,
 257                                 const void *addr,
 258                                 const void *mask,
 259                                 u16 family,
 260                                 struct netlbl_audit *audit_info)
 261 {
 262         u32 addr_len;
 263
 264         switch (family) {
 265         case AF_INET:
 266                 addr_len = sizeof(struct in_addr);
 267                 break;
 268         case AF_INET6:
 269                 addr_len = sizeof(struct in6_addr);
 270                 break;
 271         default:
 272                 return -EPFNOSUPPORT;
 273         }
 274
 275         return netlbl_unlhsh_remove(net,
 276                                     dev_name, addr, mask, addr_len,
 277                                     audit_info);
 278 }
 279
 280 /**
 281  * netlbl_cfg_cipsov4_add - Add a new CIPSOv4 DOI definition
 282  * @doi_def: CIPSO DOI definition
 283  * @audit_info: NetLabel audit information
 284  *
 285  * Description:
 286  * Add a new CIPSO DOI definition as defined by @doi_def.  Returns zero on
 287  * success and negative values on failure.
 288  *
 289  */
 290 int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def,
 291                            struct netlbl_audit *audit_info)
 292 {
 293         return cipso_v4_doi_add(doi_def, audit_info);
 294 }
 295
 296 /**
 297  * netlbl_cfg_cipsov4_del - Remove an existing CIPSOv4 DOI definition
 298  * @doi: CIPSO DOI
 299  * @audit_info: NetLabel audit information
 300  *
 301  * Description:
 302  * Remove an existing CIPSO DOI definition matching @doi.  Returns zero on
 303  * success and negative values on failure.
 304  *
 305  */
 306 void netlbl_cfg_cipsov4_del(u32 doi, struct netlbl_audit *audit_info)
 307 {
 308         cipso_v4_doi_remove(doi, audit_info);
 309 }
 310
 311 /**
 312  * netlbl_cfg_cipsov4_map_add - Add a new CIPSOv4 DOI mapping
 313  * @doi: the CIPSO DOI
 314  * @domain: the domain mapping to add
 315  * @addr: IP address
 316  * @mask: IP address mask
 317  * @audit_info: NetLabel audit information
 318  *
 319  * Description:
 320  * Add a new NetLabel/LSM domain mapping for the given CIPSO DOI to the NetLabel
 321  * subsystem.  A @domain value of NULL adds a new default domain mapping.
 322  * Returns zero on success, negative values on failure.
 323  *
 324  */
 325 int netlbl_cfg_cipsov4_map_add(u32 doi,
 326                                const char *domain,
 327                                const struct in_addr *addr,
 328                                const struct in_addr *mask,
 329                                struct netlbl_audit *audit_info)
 330 {
 331         int ret_val = -ENOMEM;
 332         struct cipso_v4_doi *doi_def;
 333         struct netlbl_dom_map *entry;
 334         struct netlbl_domaddr_map *addrmap = NULL;
 335         struct netlbl_domaddr4_map *addrinfo = NULL;
 336
 337         doi_def = cipso_v4_doi_getdef(doi);
 338         if (doi_def == NULL)
 339                 return -ENOENT;
 340
 341         entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
 342         if (entry == NULL)
 343                 return -ENOMEM;
 344         if (domain != NULL) {
 345                 entry->domain = kstrdup(domain, GFP_ATOMIC);
 346                 if (entry->domain == NULL)
 347                         goto cfg_cipsov4_map_add_failure;
 348         }
 349
 350         if (addr == NULL && mask == NULL) {
 351                 entry->type_def.cipsov4 = doi_def;
 352                 entry->type = NETLBL_NLTYPE_CIPSOV4;
 353         } else if (addr != NULL && mask != NULL) {
 354                 addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
 355                 if (addrmap == NULL)
 356                         goto cfg_cipsov4_map_add_failure;
 357                 INIT_LIST_HEAD(&addrmap->list4);
 358                 INIT_LIST_HEAD(&addrmap->list6);
 359
 360                 addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC);
 361                 if (addrinfo == NULL)
 362                         goto cfg_cipsov4_map_add_failure;
 363                 addrinfo->type_def.cipsov4 = doi_def;
 364                 addrinfo->type = NETLBL_NLTYPE_CIPSOV4;
 365                 addrinfo->list.addr = addr->s_addr & mask->s_addr;
 366                 addrinfo->list.mask = mask->s_addr;
 367                 addrinfo->list.valid = 1;
 368                 ret_val = netlbl_af4list_add(&addrinfo->list, &addrmap->list4);
 369                 if (ret_val != 0)
 370                         goto cfg_cipsov4_map_add_failure;
 371
 372                 entry->type_def.addrsel = addrmap;
 373                 entry->type = NETLBL_NLTYPE_ADDRSELECT;
 374         } else {
 375                 ret_val = -EINVAL;
 376                 goto cfg_cipsov4_map_add_failure;
 377         }
 378
 379         ret_val = netlbl_domhsh_add(entry, audit_info);
 380         if (ret_val != 0)
 381                 goto cfg_cipsov4_map_add_failure;
 382
 383         return 0;
 384
 385 cfg_cipsov4_map_add_failure:
 386         cipso_v4_doi_putdef(doi_def);
 387         kfree(entry->domain);
 388         kfree(entry);
 389         kfree(addrmap);
 390         kfree(addrinfo);
 391         return ret_val;
 392 }
 393
 394 /*
 395  * Security Attribute Functions
 396  */
 397
 398 /**
 399  * netlbl_secattr_catmap_walk - Walk a LSM secattr catmap looking for a bit
 400  * @catmap: the category bitmap
 401  * @offset: the offset to start searching at, in bits
 402  *
 403  * Description:
 404  * This function walks a LSM secattr category bitmap starting at @offset and
 405  * returns the spot of the first set bit or -ENOENT if no bits are set.
 406  *
 407  */
 408 int netlbl_secattr_catmap_walk(struct netlbl_lsm_secattr_catmap *catmap,
 409                                u32 offset)
 410 {
 411         struct netlbl_lsm_secattr_catmap *iter = catmap;
 412         u32 node_idx;
 413         u32 node_bit;
 414         NETLBL_CATMAP_MAPTYPE bitmap;
 415
 416         if (offset > iter->startbit) {
 417                 while (offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
 418                         iter = iter->next;
 419                         if (iter == NULL)
 420                                 return -ENOENT;
 421                 }
 422                 node_idx = (offset - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
 423                 node_bit = offset - iter->startbit -
 424                            (NETLBL_CATMAP_MAPSIZE * node_idx);
 425         } else {
 426                 node_idx = 0;
 427                 node_bit = 0;
 428         }
 429         bitmap = iter->bitmap[node_idx] >> node_bit;
 430
 431         for (;;) {
 432                 if (bitmap != 0) {
 433                         while ((bitmap & NETLBL_CATMAP_BIT) == 0) {
 434                                 bitmap >>= 1;
 435                                 node_bit++;
 436                         }
 437                         return iter->startbit +
 438                                 (NETLBL_CATMAP_MAPSIZE * node_idx) + node_bit;
 439                 }
 440                 if (++node_idx >= NETLBL_CATMAP_MAPCNT) {
 441                         if (iter->next != NULL) {
 442                                 iter = iter->next;
 443                                 node_idx = 0;
 444                         } else
 445                                 return -ENOENT;
 446                 }
 447                 bitmap = iter->bitmap[node_idx];
 448                 node_bit = 0;
 449         }
 450
 451         return -ENOENT;
 452 }
 453
 454 /**
 455  * netlbl_secattr_catmap_walk_rng - Find the end of a string of set bits
 456  * @catmap: the category bitmap
 457  * @offset: the offset to start searching at, in bits
 458  *
 459  * Description:
 460  * This function walks a LSM secattr category bitmap starting at @offset and
 461  * returns the spot of the first cleared bit or -ENOENT if the offset is past
 462  * the end of the bitmap.
 463  *
 464  */
 465 int netlbl_secattr_catmap_walk_rng(struct netlbl_lsm_secattr_catmap *catmap,
 466                                    u32 offset)
 467 {
 468         struct netlbl_lsm_secattr_catmap *iter = catmap;
 469         u32 node_idx;
 470         u32 node_bit;
 471         NETLBL_CATMAP_MAPTYPE bitmask;
 472         NETLBL_CATMAP_MAPTYPE bitmap;
 473
 474         if (offset > iter->startbit) {
 475                 while (offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
 476                         iter = iter->next;
 477                         if (iter == NULL)
 478                                 return -ENOENT;
 479                 }
 480                 node_idx = (offset - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
 481                 node_bit = offset - iter->startbit -
 482                            (NETLBL_CATMAP_MAPSIZE * node_idx);
 483         } else {
 484                 node_idx = 0;
 485                 node_bit = 0;
 486         }
 487         bitmask = NETLBL_CATMAP_BIT << node_bit;
 488
 489         for (;;) {
 490                 bitmap = iter->bitmap[node_idx];
 491                 while (bitmask != 0 && (bitmap & bitmask) != 0) {
 492                         bitmask <<= 1;
 493                         node_bit++;
 494                 }
 495
 496                 if (bitmask != 0)
 497                         return iter->startbit +
 498                                 (NETLBL_CATMAP_MAPSIZE * node_idx) +
 499                                 node_bit - 1;
 500                 else if (++node_idx >= NETLBL_CATMAP_MAPCNT) {
 501                         if (iter->next == NULL)
 502                                 return iter->startbit + NETLBL_CATMAP_SIZE - 1;
 503                         iter = iter->next;
 504                         node_idx = 0;
 505                 }
 506                 bitmask = NETLBL_CATMAP_BIT;
 507                 node_bit = 0;
 508         }
 509
 510         return -ENOENT;
 511 }
 512
 513 /**
 514  * netlbl_secattr_catmap_setbit - Set a bit in a LSM secattr catmap
 515  * @catmap: the category bitmap
 516  * @bit: the bit to set
 517  * @flags: memory allocation flags
 518  *
 519  * Description:
 520  * Set the bit specified by @bit in @catmap.  Returns zero on success,
 521  * negative values on failure.
 522  *
 523  */
 524 int netlbl_secattr_catmap_setbit(struct netlbl_lsm_secattr_catmap *catmap,
 525                                  u32 bit,
 526                                  gfp_t flags)
 527 {
 528         struct netlbl_lsm_secattr_catmap *iter = catmap;
 529         u32 node_bit;
 530         u32 node_idx;
 531
 532         while (iter->next != NULL &&
 533                bit >= (iter->startbit + NETLBL_CATMAP_SIZE))
 534                 iter = iter->next;
 535         if (bit >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
 536                 iter->next = netlbl_secattr_catmap_alloc(flags);
 537                 if (iter->next == NULL)
 538                         return -ENOMEM;
 539                 iter = iter->next;
 540                 iter->startbit = bit & ~(NETLBL_CATMAP_SIZE - 1);
 541         }
 542
 543         /* gcc always rounds to zero when doing integer division */
 544         node_idx = (bit - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
 545         node_bit = bit - iter->startbit - (NETLBL_CATMAP_MAPSIZE * node_idx);
 546         iter->bitmap[node_idx] |= NETLBL_CATMAP_BIT << node_bit;
 547
 548         return 0;
 549 }
 550
 551 /**
 552  * netlbl_secattr_catmap_setrng - Set a range of bits in a LSM secattr catmap
 553  * @catmap: the category bitmap
 554  * @start: the starting bit
 555  * @end: the last bit in the string
 556  * @flags: memory allocation flags
 557  *
 558  * Description:
 559  * Set a range of bits, starting at @start and ending with @end.  Returns zero
 560  * on success, negative values on failure.
 561  *
 562  */
 563 int netlbl_secattr_catmap_setrng(struct netlbl_lsm_secattr_catmap *catmap,
 564                                  u32 start,
 565                                  u32 end,
 566                                  gfp_t flags)
 567 {
 568         int ret_val = 0;
 569         struct netlbl_lsm_secattr_catmap *iter = catmap;
 570         u32 iter_max_spot;
 571         u32 spot;
 572
 573         /* XXX - This could probably be made a bit faster by combining writes
 574          * to the catmap instead of setting a single bit each time, but for
 575          * right now skipping to the start of the range in the catmap should
 576          * be a nice improvement over calling the individual setbit function
 577          * repeatedly from a loop. */
 578
 579         while (iter->next != NULL &&
 580                start >= (iter->startbit + NETLBL_CATMAP_SIZE))
 581                 iter = iter->next;
 582         iter_max_spot = iter->startbit + NETLBL_CATMAP_SIZE;
 583
 584         for (spot = start; spot <= end && ret_val == 0; spot++) {
 585                 if (spot >= iter_max_spot && iter->next != NULL) {
 586                         iter = iter->next;
 587                         iter_max_spot = iter->startbit + NETLBL_CATMAP_SIZE;
 588                 }
 589                 ret_val = netlbl_secattr_catmap_setbit(iter, spot, GFP_ATOMIC);
 590         }
 591
 592         return ret_val;
 593 }
 594
 595 /*
 596  * LSM Functions
 597  */
 598
 599 /**
 600  * netlbl_enabled - Determine if the NetLabel subsystem is enabled
 601  *
 602  * Description:
 603  * The LSM can use this function to determine if it should use NetLabel
 604  * security attributes in it's enforcement mechanism.  Currently, NetLabel is
 605  * considered to be enabled when it's configuration contains a valid setup for
 606  * at least one labeled protocol (i.e. NetLabel can understand incoming
 607  * labeled packets of at least one type); otherwise NetLabel is considered to
 608  * be disabled.
 609  *
 610  */
 611 int netlbl_enabled(void)
 612 {
 613         /* At some point we probably want to expose this mechanism to the user
 614          * as well so that admins can toggle NetLabel regardless of the
 615          * configuration */
 616         return (atomic_read(&netlabel_mgmt_protocount) > 0);
 617 }
 618
 619 /**
 620  * netlbl_sock_setattr - Label a socket using the correct protocol
 621  * @sk: the socket to label
 622  * @family: protocol family
 623  * @secattr: the security attributes
 624  *
 625  * Description:
 626  * Attach the correct label to the given socket using the security attributes
 627  * specified in @secattr.  This function requires exclusive access to @sk,
 628  * which means it either needs to be in the process of being created or locked.
 629  * Returns zero on success, -EDESTADDRREQ if the domain is configured to use
 630  * network address selectors (can't blindly label the socket), and negative
 631  * values on all other failures.
 632  *
 633  */
 634 int netlbl_sock_setattr(struct sock *sk,
 635                         u16 family,
 636                         const struct netlbl_lsm_secattr *secattr)
 637 {
 638         int ret_val;
 639         struct netlbl_dom_map *dom_entry;
 640
 641         rcu_read_lock();
 642         dom_entry = netlbl_domhsh_getentry(secattr->domain);
 643         if (dom_entry == NULL) {
 644                 ret_val = -ENOENT;
 645                 goto socket_setattr_return;
 646         }
 647         switch (family) {
 648         case AF_INET:
 649                 switch (dom_entry->type) {
 650                 case NETLBL_NLTYPE_ADDRSELECT:
 651                         ret_val = -EDESTADDRREQ;
 652                         break;
 653                 case NETLBL_NLTYPE_CIPSOV4:
 654                         ret_val = cipso_v4_sock_setattr(sk,
 655                                                     dom_entry->type_def.cipsov4,
 656                                                     secattr);
 657                         break;
 658                 case NETLBL_NLTYPE_UNLABELED:
 659                         ret_val = 0;
 660                         break;
 661                 default:
 662                         ret_val = -ENOENT;
 663                 }
 664                 break;
 665 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 666         case AF_INET6:
 667                 /* since we don't support any IPv6 labeling protocols right
 668                  * now we can optimize everything away until we do */
 669                 ret_val = 0;
 670                 break;
 671 #endif /* IPv6 */
 672         default:
 673                 ret_val = -EPROTONOSUPPORT;
 674         }
 675
 676 socket_setattr_return:
 677         rcu_read_unlock();
 678         return ret_val;
 679 }
 680
 681 /**
 682  * netlbl_sock_delattr - Delete all the NetLabel labels on a socket
 683  * @sk: the socket
 684  *
 685  * Description:
 686  * Remove all the NetLabel labeling from @sk.  The caller is responsible for
 687  * ensuring that @sk is locked.
 688  *
 689  */
 690 void netlbl_sock_delattr(struct sock *sk)
 691 {
 692         cipso_v4_sock_delattr(sk);
 693 }
 694
 695 /**
 696  * netlbl_sock_getattr - Determine the security attributes of a sock
 697  * @sk: the sock
 698  * @secattr: the security attributes
 699  *
 700  * Description:
 701  * Examines the given sock to see if any NetLabel style labeling has been
 702  * applied to the sock, if so it parses the socket label and returns the
 703  * security attributes in @secattr.  Returns zero on success, negative values
 704  * on failure.
 705  *
 706  */
 707 int netlbl_sock_getattr(struct sock *sk,
 708                         struct netlbl_lsm_secattr *secattr)
 709 {
 710         int ret_val;
 711
 712         switch (sk->sk_family) {
 713         case AF_INET:
 714                 ret_val = cipso_v4_sock_getattr(sk, secattr);
 715                 break;
 716 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 717         case AF_INET6:
 718                 ret_val = -ENOMSG;
 719                 break;
 720 #endif /* IPv6 */
 721         default:
 722                 ret_val = -EPROTONOSUPPORT;
 723         }
 724
 725         return ret_val;
 726 }
 727
 728 /**
 729  * netlbl_conn_setattr - Label a connected socket using the correct protocol
 730  * @sk: the socket to label
 731  * @addr: the destination address
 732  * @secattr: the security attributes
 733  *
 734  * Description:
 735  * Attach the correct label to the given connected socket using the security
 736  * attributes specified in @secattr.  The caller is responsible for ensuring
 737  * that @sk is locked.  Returns zero on success, negative values on failure.
 738  *
 739  */
 740 int netlbl_conn_setattr(struct sock *sk,
 741                         struct sockaddr *addr,
 742                         const struct netlbl_lsm_secattr *secattr)
 743 {
 744         int ret_val;
 745         struct sockaddr_in *addr4;
 746         struct netlbl_domaddr4_map *af4_entry;
 747
 748         rcu_read_lock();
 749         switch (addr->sa_family) {
 750         case AF_INET:
 751                 addr4 = (struct sockaddr_in *)addr;
 752                 af4_entry = netlbl_domhsh_getentry_af4(secattr->domain,
 753                                                        addr4->sin_addr.s_addr);
 754                 if (af4_entry == NULL) {
 755                         ret_val = -ENOENT;
 756                         goto conn_setattr_return;
 757                 }
 758                 switch (af4_entry->type) {
 759                 case NETLBL_NLTYPE_CIPSOV4:
 760                         ret_val = cipso_v4_sock_setattr(sk,
 761                                                    af4_entry->type_def.cipsov4,
 762                                                    secattr);
 763                         break;
 764                 case NETLBL_NLTYPE_UNLABELED:
 765                         /* just delete the protocols we support for right now
 766                          * but we could remove other protocols if needed */
 767                         cipso_v4_sock_delattr(sk);
 768                         ret_val = 0;
 769                         break;
 770                 default:
 771                         ret_val = -ENOENT;
 772                 }
 773                 break;
 774 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 775         case AF_INET6:
 776                 /* since we don't support any IPv6 labeling protocols right
 777                  * now we can optimize everything away until we do */
 778                 ret_val = 0;
 779                 break;
 780 #endif /* IPv6 */
 781         default:
 782                 ret_val = -EPROTONOSUPPORT;
 783         }
 784
 785 conn_setattr_return:
 786         rcu_read_unlock();
 787         return ret_val;
 788 }
 789
 790 /**
 791  * netlbl_req_setattr - Label a request socket using the correct protocol
 792  * @req: the request socket to label
 793  * @secattr: the security attributes
 794  *
 795  * Description:
 796  * Attach the correct label to the given socket using the security attributes
 797  * specified in @secattr.  Returns zero on success, negative values on failure.
 798  *
 799  */
 800 int netlbl_req_setattr(struct request_sock *req,
 801                        const struct netlbl_lsm_secattr *secattr)
 802 {
 803         int ret_val;
 804         struct netlbl_dom_map *dom_entry;
 805         struct netlbl_domaddr4_map *af4_entry;
 806         u32 proto_type;
 807         struct cipso_v4_doi *proto_cv4;
 808
 809         rcu_read_lock();
 810         dom_entry = netlbl_domhsh_getentry(secattr->domain);
 811         if (dom_entry == NULL) {
 812                 ret_val = -ENOENT;
 813                 goto req_setattr_return;
 814         }
 815         switch (req->rsk_ops->family) {
 816         case AF_INET:
 817                 if (dom_entry->type == NETLBL_NLTYPE_ADDRSELECT) {
 818                         struct inet_request_sock *req_inet = inet_rsk(req);
 819                         af4_entry = netlbl_domhsh_getentry_af4(secattr->domain,
 820                                                             req_inet->rmt_addr);
 821                         if (af4_entry == NULL) {
 822                                 ret_val = -ENOENT;
 823                                 goto req_setattr_return;
 824                         }
 825                         proto_type = af4_entry->type;
 826                         proto_cv4 = af4_entry->type_def.cipsov4;
 827                 } else {
 828                         proto_type = dom_entry->type;
 829                         proto_cv4 = dom_entry->type_def.cipsov4;
 830                 }
 831                 switch (proto_type) {
 832                 case NETLBL_NLTYPE_CIPSOV4:
 833                         ret_val = cipso_v4_req_setattr(req, proto_cv4, secattr);
 834                         break;
 835                 case NETLBL_NLTYPE_UNLABELED:
 836                         /* just delete the protocols we support for right now
 837                          * but we could remove other protocols if needed */
 838                         cipso_v4_req_delattr(req);
 839                         ret_val = 0;
 840                         break;
 841                 default:
 842                         ret_val = -ENOENT;
 843                 }
 844                 break;
 845 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 846         case AF_INET6:
 847                 /* since we don't support any IPv6 labeling protocols right
 848                  * now we can optimize everything away until we do */
 849                 ret_val = 0;
 850                 break;
 851 #endif /* IPv6 */
 852         default:
 853                 ret_val = -EPROTONOSUPPORT;
 854         }
 855
 856 req_setattr_return:
 857         rcu_read_unlock();
 858         return ret_val;
 859 }
 860
 861 /**
 862 * netlbl_req_delattr - Delete all the NetLabel labels on a socket
 863 * @req: the socket
 864 *
 865 * Description:
 866 * Remove all the NetLabel labeling from @req.
 867 *
 868 */
 869 void netlbl_req_delattr(struct request_sock *req)
 870 {
 871         cipso_v4_req_delattr(req);
 872 }
 873
 874 /**
 875  * netlbl_skbuff_setattr - Label a packet using the correct protocol
 876  * @skb: the packet
 877  * @family: protocol family
 878  * @secattr: the security attributes
 879  *
 880  * Description:
 881  * Attach the correct label to the given packet using the security attributes
 882  * specified in @secattr.  Returns zero on success, negative values on failure.
 883  *
 884  */
 885 int netlbl_skbuff_setattr(struct sk_buff *skb,
 886                           u16 family,
 887                           const struct netlbl_lsm_secattr *secattr)
 888 {
 889         int ret_val;
 890         struct iphdr *hdr4;
 891         struct netlbl_domaddr4_map *af4_entry;
 892
 893         rcu_read_lock();
 894         switch (family) {
 895         case AF_INET:
 896                 hdr4 = ip_hdr(skb);
 897                 af4_entry = netlbl_domhsh_getentry_af4(secattr->domain,
 898                                                        hdr4->daddr);
 899                 if (af4_entry == NULL) {
 900                         ret_val = -ENOENT;
 901                         goto skbuff_setattr_return;
 902                 }
 903                 switch (af4_entry->type) {
 904                 case NETLBL_NLTYPE_CIPSOV4:
 905                         ret_val = cipso_v4_skbuff_setattr(skb,
 906                                                    af4_entry->type_def.cipsov4,
 907                                                    secattr);
 908                         break;
 909                 case NETLBL_NLTYPE_UNLABELED:
 910                         /* just delete the protocols we support for right now
 911                          * but we could remove other protocols if needed */
 912                         ret_val = cipso_v4_skbuff_delattr(skb);
 913                         break;
 914                 default:
 915                         ret_val = -ENOENT;
 916                 }
 917                 break;
 918 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 919         case AF_INET6:
 920                 /* since we don't support any IPv6 labeling protocols right
 921                  * now we can optimize everything away until we do */
 922                 ret_val = 0;
 923                 break;
 924 #endif /* IPv6 */
 925         default:
 926                 ret_val = -EPROTONOSUPPORT;
 927         }
 928
 929 skbuff_setattr_return:
 930         rcu_read_unlock();
 931         return ret_val;
 932 }
 933
 934 /**
 935  * netlbl_skbuff_getattr - Determine the security attributes of a packet
 936  * @skb: the packet
 937  * @family: protocol family
 938  * @secattr: the security attributes
 939  *
 940  * Description:
 941  * Examines the given packet to see if a recognized form of packet labeling
 942  * is present, if so it parses the packet label and returns the security
 943  * attributes in @secattr.  Returns zero on success, negative values on
 944  * failure.
 945  *
 946  */
 947 int netlbl_skbuff_getattr(const struct sk_buff *skb,
 948                           u16 family,
 949                           struct netlbl_lsm_secattr *secattr)
 950 {
 951         switch (family) {
 952         case AF_INET:
 953                 if (CIPSO_V4_OPTEXIST(skb) &&
 954                     cipso_v4_skbuff_getattr(skb, secattr) == 0)
 955                         return 0;
 956                 break;
 957 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 958         case AF_INET6:
 959                 break;
 960 #endif /* IPv6 */
 961         }
 962
 963         return netlbl_unlabel_getattr(skb, family, secattr);
 964 }
 965
 966 /**
 967  * netlbl_skbuff_err - Handle a LSM error on a sk_buff
 968  * @skb: the packet
 969  * @error: the error code
 970  * @gateway: true if host is acting as a gateway, false otherwise
 971  *
 972  * Description:
 973  * Deal with a LSM problem when handling the packet in @skb, typically this is
 974  * a permission denied problem (-EACCES).  The correct action is determined
 975  * according to the packet's labeling protocol.
 976  *
 977  */
 978 void netlbl_skbuff_err(struct sk_buff *skb, int error, int gateway)
 979 {
 980         if (CIPSO_V4_OPTEXIST(skb))
 981                 cipso_v4_error(skb, error, gateway);
 982 }
 983
 984 /**
 985  * netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches
 986  *
 987  * Description:
 988  * For all of the NetLabel protocols that support some form of label mapping
 989  * cache, invalidate the cache.  Returns zero on success, negative values on
 990  * error.
 991  *
 992  */
 993 void netlbl_cache_invalidate(void)
 994 {
 995         cipso_v4_cache_invalidate();
 996 }
 997
 998 /**
 999  * netlbl_cache_add - Add an entry to a NetLabel protocol cache
1000  * @skb: the packet
1001  * @secattr: the packet's security attributes
1002  *
1003  * Description:
1004  * Add the LSM security attributes for the given packet to the underlying
1005  * NetLabel protocol's label mapping cache.  Returns zero on success, negative
1006  * values on error.
1007  *
1008  */
1009 int netlbl_cache_add(const struct sk_buff *skb,
1010                      const struct netlbl_lsm_secattr *secattr)
1011 {
1012         if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0)
1013                 return -ENOMSG;
1014
1015         if (CIPSO_V4_OPTEXIST(skb))
1016                 return cipso_v4_cache_add(skb, secattr);
1017
1018         return -ENOMSG;
1019 }
1020
1021 /*
1022  * Protocol Engine Functions
1023  */
1024
1025 /**
1026  * netlbl_audit_start - Start an audit message
1027  * @type: audit message type
1028  * @audit_info: NetLabel audit information
1029  *
1030  * Description:
1031  * Start an audit message using the type specified in @type and fill the audit
1032  * message with some fields common to all NetLabel audit messages.  This
1033  * function should only be used by protocol engines, not LSMs.  Returns a
1034  * pointer to the audit buffer on success, NULL on failure.
1035  *
1036  */
1037 struct audit_buffer *netlbl_audit_start(int type,
1038                                         struct netlbl_audit *audit_info)
1039 {
1040         return netlbl_audit_start_common(type, audit_info);
1041 }
1042
1043 /*
1044  * Setup Functions
1045  */
1046
1047 /**
1048  * netlbl_init - Initialize NetLabel
1049  *
1050  * Description:
1051  * Perform the required NetLabel initialization before first use.
1052  *
1053  */
1054 static int __init netlbl_init(void)
1055 {
1056         int ret_val;
1057
1058         printk(KERN_INFO "NetLabel: Initializing\n");
1059         printk(KERN_INFO "NetLabel:  domain hash size = %u\n",
1060                (1 << NETLBL_DOMHSH_BITSIZE));
1061         printk(KERN_INFO "NetLabel:  protocols ="
1062                " UNLABELED"
1063                " CIPSOv4"
1064                "\n");
1065
1066         ret_val = netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE);
1067         if (ret_val != 0)
1068                 goto init_failure;
1069
1070         ret_val = netlbl_unlabel_init(NETLBL_UNLHSH_BITSIZE);
1071         if (ret_val != 0)
1072                 goto init_failure;
1073
1074         ret_val = netlbl_netlink_init();
1075         if (ret_val != 0)
1076                 goto init_failure;
1077
1078         ret_val = netlbl_unlabel_defconf();
1079         if (ret_val != 0)
1080                 goto init_failure;
1081         printk(KERN_INFO "NetLabel:  unlabeled traffic allowed by default\n");
1082
1083         return 0;
1084
1085 init_failure:
1086         panic("NetLabel: failed to initialize properly (%d)\n", ret_val);
1087 }
1088
1089 subsys_initcall(netlbl_init);