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 <net/ip.h>
  35 #include <net/netlabel.h>
  36 #include <net/cipso_ipv4.h>
  37 #include <asm/bug.h>
  38 #include <asm/atomic.h>
  39
  40 #include "netlabel_domainhash.h"
  41 #include "netlabel_unlabeled.h"
  42 #include "netlabel_cipso_v4.h"
  43 #include "netlabel_user.h"
  44 #include "netlabel_mgmt.h"
  45
  46 /*
  47  * Configuration Functions
  48  */
  49
  50 /**
  51  * netlbl_cfg_map_del - Remove a NetLabel/LSM domain mapping
  52  * @domain: the domain mapping to remove
  53  * @audit_info: NetLabel audit information
  54  *
  55  * Description:
  56  * Removes a NetLabel/LSM domain mapping.  A @domain value of NULL causes the
  57  * default domain mapping to be removed.  Returns zero on success, negative
  58  * values on failure.
  59  *
  60  */
  61 int netlbl_cfg_map_del(const char *domain, struct netlbl_audit *audit_info)
  62 {
  63         return netlbl_domhsh_remove(domain, audit_info);
  64 }
  65
  66 /**
  67  * netlbl_cfg_unlbl_add_map - Add an unlabeled NetLabel/LSM domain mapping
  68  * @domain: the domain mapping to add
  69  * @audit_info: NetLabel audit information
  70  *
  71  * Description:
  72  * Adds a new unlabeled NetLabel/LSM domain mapping.  A @domain value of NULL
  73  * causes a new default domain mapping to be added.  Returns zero on success,
  74  * negative values on failure.
  75  *
  76  */
  77 int netlbl_cfg_unlbl_add_map(const char *domain,
  78                              struct netlbl_audit *audit_info)
  79 {
  80         int ret_val = -ENOMEM;
  81         struct netlbl_dom_map *entry;
  82
  83         entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
  84         if (entry == NULL)
  85                 return -ENOMEM;
  86         if (domain != NULL) {
  87                 entry->domain = kstrdup(domain, GFP_ATOMIC);
  88                 if (entry->domain == NULL)
  89                         goto cfg_unlbl_add_map_failure;
  90         }
  91         entry->type = NETLBL_NLTYPE_UNLABELED;
  92
  93         ret_val = netlbl_domhsh_add(entry, audit_info);
  94         if (ret_val != 0)
  95                 goto cfg_unlbl_add_map_failure;
  96
  97         return 0;
  98
  99 cfg_unlbl_add_map_failure:
 100         if (entry != NULL)
 101                 kfree(entry->domain);
 102         kfree(entry);
 103         return ret_val;
 104 }
 105
 106 /**
 107  * netlbl_cfg_cipsov4_add_map - Add a new CIPSOv4 DOI definition and mapping
 108  * @doi_def: the DOI definition
 109  * @domain: the domain mapping to add
 110  * @audit_info: NetLabel audit information
 111  *
 112  * Description:
 113  * Add a new CIPSOv4 DOI definition and NetLabel/LSM domain mapping for this
 114  * new DOI definition to the NetLabel subsystem.  A @domain value of NULL adds
 115  * a new default domain mapping.  Returns zero on success, negative values on
 116  * failure.
 117  *
 118  */
 119 int netlbl_cfg_cipsov4_add_map(struct cipso_v4_doi *doi_def,
 120                                const char *domain,
 121                                struct netlbl_audit *audit_info)
 122 {
 123         int ret_val = -ENOMEM;
 124         u32 doi;
 125         u32 doi_type;
 126         struct netlbl_dom_map *entry;
 127         const char *type_str;
 128         struct audit_buffer *audit_buf;
 129
 130         doi = doi_def->doi;
 131         doi_type = doi_def->type;
 132
 133         entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
 134         if (entry == NULL)
 135                 return -ENOMEM;
 136         if (domain != NULL) {
 137                 entry->domain = kstrdup(domain, GFP_ATOMIC);
 138                 if (entry->domain == NULL)
 139                         goto cfg_cipsov4_add_map_failure;
 140         }
 141
 142         ret_val = cipso_v4_doi_add(doi_def);
 143         if (ret_val != 0)
 144                 goto cfg_cipsov4_add_map_failure_remove_doi;
 145         entry->type = NETLBL_NLTYPE_CIPSOV4;
 146         entry->type_def.cipsov4 = cipso_v4_doi_getdef(doi);
 147         if (entry->type_def.cipsov4 == NULL) {
 148                 ret_val = -ENOENT;
 149                 goto cfg_cipsov4_add_map_failure_remove_doi;
 150         }
 151         ret_val = netlbl_domhsh_add(entry, audit_info);
 152         if (ret_val != 0)
 153                 goto cfg_cipsov4_add_map_failure_release_doi;
 154
 155 cfg_cipsov4_add_map_return:
 156         audit_buf = netlbl_audit_start_common(AUDIT_MAC_CIPSOV4_ADD,
 157                                               audit_info);
 158         if (audit_buf != NULL) {
 159                 switch (doi_type) {
 160                 case CIPSO_V4_MAP_TRANS:
 161                         type_str = "trans";
 162                         break;
 163                 case CIPSO_V4_MAP_PASS:
 164                         type_str = "pass";
 165                         break;
 166                 case CIPSO_V4_MAP_LOCAL:
 167                         type_str = "local";
 168                         break;
 169                 default:
 170                         type_str = "(unknown)";
 171                 }
 172                 audit_log_format(audit_buf,
 173                                  " cipso_doi=%u cipso_type=%s res=%u",
 174                                  doi, type_str, ret_val == 0 ? 1 : 0);
 175                 audit_log_end(audit_buf);
 176         }
 177
 178         return ret_val;
 179
 180 cfg_cipsov4_add_map_failure_release_doi:
 181         cipso_v4_doi_putdef(doi_def);
 182 cfg_cipsov4_add_map_failure_remove_doi:
 183         cipso_v4_doi_remove(doi, audit_info);
 184 cfg_cipsov4_add_map_failure:
 185         if (entry != NULL)
 186                 kfree(entry->domain);
 187         kfree(entry);
 188         goto cfg_cipsov4_add_map_return;
 189 }
 190
 191 /*
 192  * Security Attribute Functions
 193  */
 194
 195 /**
 196  * netlbl_secattr_catmap_walk - Walk a LSM secattr catmap looking for a bit
 197  * @catmap: the category bitmap
 198  * @offset: the offset to start searching at, in bits
 199  *
 200  * Description:
 201  * This function walks a LSM secattr category bitmap starting at @offset and
 202  * returns the spot of the first set bit or -ENOENT if no bits are set.
 203  *
 204  */
 205 int netlbl_secattr_catmap_walk(struct netlbl_lsm_secattr_catmap *catmap,
 206                                u32 offset)
 207 {
 208         struct netlbl_lsm_secattr_catmap *iter = catmap;
 209         u32 node_idx;
 210         u32 node_bit;
 211         NETLBL_CATMAP_MAPTYPE bitmap;
 212
 213         if (offset > iter->startbit) {
 214                 while (offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
 215                         iter = iter->next;
 216                         if (iter == NULL)
 217                                 return -ENOENT;
 218                 }
 219                 node_idx = (offset - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
 220                 node_bit = offset - iter->startbit -
 221                            (NETLBL_CATMAP_MAPSIZE * node_idx);
 222         } else {
 223                 node_idx = 0;
 224                 node_bit = 0;
 225         }
 226         bitmap = iter->bitmap[node_idx] >> node_bit;
 227
 228         for (;;) {
 229                 if (bitmap != 0) {
 230                         while ((bitmap & NETLBL_CATMAP_BIT) == 0) {
 231                                 bitmap >>= 1;
 232                                 node_bit++;
 233                         }
 234                         return iter->startbit +
 235                                 (NETLBL_CATMAP_MAPSIZE * node_idx) + node_bit;
 236                 }
 237                 if (++node_idx >= NETLBL_CATMAP_MAPCNT) {
 238                         if (iter->next != NULL) {
 239                                 iter = iter->next;
 240                                 node_idx = 0;
 241                         } else
 242                                 return -ENOENT;
 243                 }
 244                 bitmap = iter->bitmap[node_idx];
 245                 node_bit = 0;
 246         }
 247
 248         return -ENOENT;
 249 }
 250
 251 /**
 252  * netlbl_secattr_catmap_walk_rng - Find the end of a string of set bits
 253  * @catmap: the category bitmap
 254  * @offset: the offset to start searching at, in bits
 255  *
 256  * Description:
 257  * This function walks a LSM secattr category bitmap starting at @offset and
 258  * returns the spot of the first cleared bit or -ENOENT if the offset is past
 259  * the end of the bitmap.
 260  *
 261  */
 262 int netlbl_secattr_catmap_walk_rng(struct netlbl_lsm_secattr_catmap *catmap,
 263                                    u32 offset)
 264 {
 265         struct netlbl_lsm_secattr_catmap *iter = catmap;
 266         u32 node_idx;
 267         u32 node_bit;
 268         NETLBL_CATMAP_MAPTYPE bitmask;
 269         NETLBL_CATMAP_MAPTYPE bitmap;
 270
 271         if (offset > iter->startbit) {
 272                 while (offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
 273                         iter = iter->next;
 274                         if (iter == NULL)
 275                                 return -ENOENT;
 276                 }
 277                 node_idx = (offset - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
 278                 node_bit = offset - iter->startbit -
 279                            (NETLBL_CATMAP_MAPSIZE * node_idx);
 280         } else {
 281                 node_idx = 0;
 282                 node_bit = 0;
 283         }
 284         bitmask = NETLBL_CATMAP_BIT << node_bit;
 285
 286         for (;;) {
 287                 bitmap = iter->bitmap[node_idx];
 288                 while (bitmask != 0 && (bitmap & bitmask) != 0) {
 289                         bitmask <<= 1;
 290                         node_bit++;
 291                 }
 292
 293                 if (bitmask != 0)
 294                         return iter->startbit +
 295                                 (NETLBL_CATMAP_MAPSIZE * node_idx) +
 296                                 node_bit - 1;
 297                 else if (++node_idx >= NETLBL_CATMAP_MAPCNT) {
 298                         if (iter->next == NULL)
 299                                 return iter->startbit + NETLBL_CATMAP_SIZE - 1;
 300                         iter = iter->next;
 301                         node_idx = 0;
 302                 }
 303                 bitmask = NETLBL_CATMAP_BIT;
 304                 node_bit = 0;
 305         }
 306
 307         return -ENOENT;
 308 }
 309
 310 /**
 311  * netlbl_secattr_catmap_setbit - Set a bit in a LSM secattr catmap
 312  * @catmap: the category bitmap
 313  * @bit: the bit to set
 314  * @flags: memory allocation flags
 315  *
 316  * Description:
 317  * Set the bit specified by @bit in @catmap.  Returns zero on success,
 318  * negative values on failure.
 319  *
 320  */
 321 int netlbl_secattr_catmap_setbit(struct netlbl_lsm_secattr_catmap *catmap,
 322                                  u32 bit,
 323                                  gfp_t flags)
 324 {
 325         struct netlbl_lsm_secattr_catmap *iter = catmap;
 326         u32 node_bit;
 327         u32 node_idx;
 328
 329         while (iter->next != NULL &&
 330                bit >= (iter->startbit + NETLBL_CATMAP_SIZE))
 331                 iter = iter->next;
 332         if (bit >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
 333                 iter->next = netlbl_secattr_catmap_alloc(flags);
 334                 if (iter->next == NULL)
 335                         return -ENOMEM;
 336                 iter = iter->next;
 337                 iter->startbit = bit & ~(NETLBL_CATMAP_SIZE - 1);
 338         }
 339
 340         /* gcc always rounds to zero when doing integer division */
 341         node_idx = (bit - iter->startbit) / NETLBL_CATMAP_MAPSIZE;
 342         node_bit = bit - iter->startbit - (NETLBL_CATMAP_MAPSIZE * node_idx);
 343         iter->bitmap[node_idx] |= NETLBL_CATMAP_BIT << node_bit;
 344
 345         return 0;
 346 }
 347
 348 /**
 349  * netlbl_secattr_catmap_setrng - Set a range of bits in a LSM secattr catmap
 350  * @catmap: the category bitmap
 351  * @start: the starting bit
 352  * @end: the last bit in the string
 353  * @flags: memory allocation flags
 354  *
 355  * Description:
 356  * Set a range of bits, starting at @start and ending with @end.  Returns zero
 357  * on success, negative values on failure.
 358  *
 359  */
 360 int netlbl_secattr_catmap_setrng(struct netlbl_lsm_secattr_catmap *catmap,
 361                                  u32 start,
 362                                  u32 end,
 363                                  gfp_t flags)
 364 {
 365         int ret_val = 0;
 366         struct netlbl_lsm_secattr_catmap *iter = catmap;
 367         u32 iter_max_spot;
 368         u32 spot;
 369
 370         /* XXX - This could probably be made a bit faster by combining writes
 371          * to the catmap instead of setting a single bit each time, but for
 372          * right now skipping to the start of the range in the catmap should
 373          * be a nice improvement over calling the individual setbit function
 374          * repeatedly from a loop. */
 375
 376         while (iter->next != NULL &&
 377                start >= (iter->startbit + NETLBL_CATMAP_SIZE))
 378                 iter = iter->next;
 379         iter_max_spot = iter->startbit + NETLBL_CATMAP_SIZE;
 380
 381         for (spot = start; spot <= end && ret_val == 0; spot++) {
 382                 if (spot >= iter_max_spot && iter->next != NULL) {
 383                         iter = iter->next;
 384                         iter_max_spot = iter->startbit + NETLBL_CATMAP_SIZE;
 385                 }
 386                 ret_val = netlbl_secattr_catmap_setbit(iter, spot, GFP_ATOMIC);
 387         }
 388
 389         return ret_val;
 390 }
 391
 392 /*
 393  * LSM Functions
 394  */
 395
 396 /**
 397  * netlbl_enabled - Determine if the NetLabel subsystem is enabled
 398  *
 399  * Description:
 400  * The LSM can use this function to determine if it should use NetLabel
 401  * security attributes in it's enforcement mechanism.  Currently, NetLabel is
 402  * considered to be enabled when it's configuration contains a valid setup for
 403  * at least one labeled protocol (i.e. NetLabel can understand incoming
 404  * labeled packets of at least one type); otherwise NetLabel is considered to
 405  * be disabled.
 406  *
 407  */
 408 int netlbl_enabled(void)
 409 {
 410         /* At some point we probably want to expose this mechanism to the user
 411          * as well so that admins can toggle NetLabel regardless of the
 412          * configuration */
 413         return (atomic_read(&netlabel_mgmt_protocount) > 0);
 414 }
 415
 416 /**
 417  * netlbl_socket_setattr - Label a socket using the correct protocol
 418  * @sk: the socket to label
 419  * @secattr: the security attributes
 420  *
 421  * Description:
 422  * Attach the correct label to the given socket using the security attributes
 423  * specified in @secattr.  This function requires exclusive access to @sk,
 424  * which means it either needs to be in the process of being created or locked.
 425  * Returns zero on success, -EDESTADDRREQ if the domain is configured to use
 426  * network address selectors (can't blindly label the socket), and negative
 427  * values on all other failures.
 428  *
 429  */
 430 int netlbl_sock_setattr(struct sock *sk,
 431                         const struct netlbl_lsm_secattr *secattr)
 432 {
 433         int ret_val = -ENOENT;
 434         struct netlbl_dom_map *dom_entry;
 435
 436         rcu_read_lock();
 437         dom_entry = netlbl_domhsh_getentry(secattr->domain);
 438         if (dom_entry == NULL)
 439                 goto socket_setattr_return;
 440         switch (dom_entry->type) {
 441         case NETLBL_NLTYPE_ADDRSELECT:
 442                 ret_val = -EDESTADDRREQ;
 443                 break;
 444         case NETLBL_NLTYPE_CIPSOV4:
 445                 ret_val = cipso_v4_sock_setattr(sk,
 446                                                 dom_entry->type_def.cipsov4,
 447                                                 secattr);
 448                 break;
 449         case NETLBL_NLTYPE_UNLABELED:
 450                 ret_val = 0;
 451                 break;
 452         default:
 453                 ret_val = -ENOENT;
 454         }
 455
 456 socket_setattr_return:
 457         rcu_read_unlock();
 458         return ret_val;
 459 }
 460
 461 /**
 462  * netlbl_sock_delattr - Delete all the NetLabel labels on a socket
 463  * @sk: the socket
 464  *
 465  * Description:
 466  * Remove all the NetLabel labeling from @sk.  The caller is responsible for
 467  * ensuring that @sk is locked.
 468  *
 469  */
 470 void netlbl_sock_delattr(struct sock *sk)
 471 {
 472         cipso_v4_sock_delattr(sk);
 473 }
 474
 475 /**
 476  * netlbl_sock_getattr - Determine the security attributes of a sock
 477  * @sk: the sock
 478  * @secattr: the security attributes
 479  *
 480  * Description:
 481  * Examines the given sock to see if any NetLabel style labeling has been
 482  * applied to the sock, if so it parses the socket label and returns the
 483  * security attributes in @secattr.  Returns zero on success, negative values
 484  * on failure.
 485  *
 486  */
 487 int netlbl_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr)
 488 {
 489         return cipso_v4_sock_getattr(sk, secattr);
 490 }
 491
 492 /**
 493  * netlbl_conn_setattr - Label a connected socket using the correct protocol
 494  * @sk: the socket to label
 495  * @addr: the destination address
 496  * @secattr: the security attributes
 497  *
 498  * Description:
 499  * Attach the correct label to the given connected socket using the security
 500  * attributes specified in @secattr.  The caller is responsible for ensuring
 501  * that @sk is locked.  Returns zero on success, negative values on failure.
 502  *
 503  */
 504 int netlbl_conn_setattr(struct sock *sk,
 505                         struct sockaddr *addr,
 506                         const struct netlbl_lsm_secattr *secattr)
 507 {
 508         int ret_val;
 509         struct sockaddr_in *addr4;
 510         struct netlbl_domaddr4_map *af4_entry;
 511
 512         rcu_read_lock();
 513         switch (addr->sa_family) {
 514         case AF_INET:
 515                 addr4 = (struct sockaddr_in *)addr;
 516                 af4_entry = netlbl_domhsh_getentry_af4(secattr->domain,
 517                                                        addr4->sin_addr.s_addr);
 518                 if (af4_entry == NULL) {
 519                         ret_val = -ENOENT;
 520                         goto conn_setattr_return;
 521                 }
 522                 switch (af4_entry->type) {
 523                 case NETLBL_NLTYPE_CIPSOV4:
 524                         ret_val = cipso_v4_sock_setattr(sk,
 525                                                    af4_entry->type_def.cipsov4,
 526                                                    secattr);
 527                         break;
 528                 case NETLBL_NLTYPE_UNLABELED:
 529                         /* just delete the protocols we support for right now
 530                          * but we could remove other protocols if needed */
 531                         cipso_v4_sock_delattr(sk);
 532                         ret_val = 0;
 533                         break;
 534                 default:
 535                         ret_val = -ENOENT;
 536                 }
 537                 break;
 538 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 539         case AF_INET6:
 540                 /* since we don't support any IPv6 labeling protocols right
 541                  * now we can optimize everything away until we do */
 542                 ret_val = 0;
 543                 break;
 544 #endif /* IPv6 */
 545         default:
 546                 ret_val = 0;
 547         }
 548
 549 conn_setattr_return:
 550         rcu_read_unlock();
 551         return ret_val;
 552 }
 553
 554 /**
 555  * netlbl_skbuff_setattr - Label a packet using the correct protocol
 556  * @skb: the packet
 557  * @family: protocol family
 558  * @secattr: the security attributes
 559  *
 560  * Description:
 561  * Attach the correct label to the given packet using the security attributes
 562  * specified in @secattr.  Returns zero on success, negative values on failure.
 563  *
 564  */
 565 int netlbl_skbuff_setattr(struct sk_buff *skb,
 566                           u16 family,
 567                           const struct netlbl_lsm_secattr *secattr)
 568 {
 569         int ret_val;
 570         struct iphdr *hdr4;
 571         struct netlbl_domaddr4_map *af4_entry;
 572
 573         rcu_read_lock();
 574         switch (family) {
 575         case AF_INET:
 576                 hdr4 = ip_hdr(skb);
 577                 af4_entry = netlbl_domhsh_getentry_af4(secattr->domain,
 578                                                        hdr4->daddr);
 579                 if (af4_entry == NULL) {
 580                         ret_val = -ENOENT;
 581                         goto skbuff_setattr_return;
 582                 }
 583                 switch (af4_entry->type) {
 584                 case NETLBL_NLTYPE_CIPSOV4:
 585                         ret_val = cipso_v4_skbuff_setattr(skb,
 586                                                    af4_entry->type_def.cipsov4,
 587                                                    secattr);
 588                         break;
 589                 case NETLBL_NLTYPE_UNLABELED:
 590                         /* just delete the protocols we support for right now
 591                          * but we could remove other protocols if needed */
 592                         ret_val = cipso_v4_skbuff_delattr(skb);
 593                         break;
 594                 default:
 595                         ret_val = -ENOENT;
 596                 }
 597                 break;
 598 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 599         case AF_INET6:
 600                 /* since we don't support any IPv6 labeling protocols right
 601                  * now we can optimize everything away until we do */
 602                 ret_val = 0;
 603                 break;
 604 #endif /* IPv6 */
 605         default:
 606                 ret_val = 0;
 607         }
 608
 609 skbuff_setattr_return:
 610         rcu_read_unlock();
 611         return ret_val;
 612 }
 613
 614 /**
 615  * netlbl_skbuff_getattr - Determine the security attributes of a packet
 616  * @skb: the packet
 617  * @family: protocol family
 618  * @secattr: the security attributes
 619  *
 620  * Description:
 621  * Examines the given packet to see if a recognized form of packet labeling
 622  * is present, if so it parses the packet label and returns the security
 623  * attributes in @secattr.  Returns zero on success, negative values on
 624  * failure.
 625  *
 626  */
 627 int netlbl_skbuff_getattr(const struct sk_buff *skb,
 628                           u16 family,
 629                           struct netlbl_lsm_secattr *secattr)
 630 {
 631         if (CIPSO_V4_OPTEXIST(skb) &&
 632             cipso_v4_skbuff_getattr(skb, secattr) == 0)
 633                 return 0;
 634
 635         return netlbl_unlabel_getattr(skb, family, secattr);
 636 }
 637
 638 /**
 639  * netlbl_skbuff_err - Handle a LSM error on a sk_buff
 640  * @skb: the packet
 641  * @error: the error code
 642  * @gateway: true if host is acting as a gateway, false otherwise
 643  *
 644  * Description:
 645  * Deal with a LSM problem when handling the packet in @skb, typically this is
 646  * a permission denied problem (-EACCES).  The correct action is determined
 647  * according to the packet's labeling protocol.
 648  *
 649  */
 650 void netlbl_skbuff_err(struct sk_buff *skb, int error, int gateway)
 651 {
 652         if (CIPSO_V4_OPTEXIST(skb))
 653                 cipso_v4_error(skb, error, gateway);
 654 }
 655
 656 /**
 657  * netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches
 658  *
 659  * Description:
 660  * For all of the NetLabel protocols that support some form of label mapping
 661  * cache, invalidate the cache.  Returns zero on success, negative values on
 662  * error.
 663  *
 664  */
 665 void netlbl_cache_invalidate(void)
 666 {
 667         cipso_v4_cache_invalidate();
 668 }
 669
 670 /**
 671  * netlbl_cache_add - Add an entry to a NetLabel protocol cache
 672  * @skb: the packet
 673  * @secattr: the packet's security attributes
 674  *
 675  * Description:
 676  * Add the LSM security attributes for the given packet to the underlying
 677  * NetLabel protocol's label mapping cache.  Returns zero on success, negative
 678  * values on error.
 679  *
 680  */
 681 int netlbl_cache_add(const struct sk_buff *skb,
 682                      const struct netlbl_lsm_secattr *secattr)
 683 {
 684         if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0)
 685                 return -ENOMSG;
 686
 687         if (CIPSO_V4_OPTEXIST(skb))
 688                 return cipso_v4_cache_add(skb, secattr);
 689
 690         return -ENOMSG;
 691 }
 692
 693 /*
 694  * Setup Functions
 695  */
 696
 697 /**
 698  * netlbl_init - Initialize NetLabel
 699  *
 700  * Description:
 701  * Perform the required NetLabel initialization before first use.
 702  *
 703  */
 704 static int __init netlbl_init(void)
 705 {
 706         int ret_val;
 707
 708         printk(KERN_INFO "NetLabel: Initializing\n");
 709         printk(KERN_INFO "NetLabel:  domain hash size = %u\n",
 710                (1 << NETLBL_DOMHSH_BITSIZE));
 711         printk(KERN_INFO "NetLabel:  protocols ="
 712                " UNLABELED"
 713                " CIPSOv4"
 714                "\n");
 715
 716         ret_val = netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE);
 717         if (ret_val != 0)
 718                 goto init_failure;
 719
 720         ret_val = netlbl_unlabel_init(NETLBL_UNLHSH_BITSIZE);
 721         if (ret_val != 0)
 722                 goto init_failure;
 723
 724         ret_val = netlbl_netlink_init();
 725         if (ret_val != 0)
 726                 goto init_failure;
 727
 728         ret_val = netlbl_unlabel_defconf();
 729         if (ret_val != 0)
 730                 goto init_failure;
 731         printk(KERN_INFO "NetLabel:  unlabeled traffic allowed by default\n");
 732
 733         return 0;
 734
 735 init_failure:
 736         panic("NetLabel: failed to initialize properly (%d)\n", ret_val);
 737 }
 738
 739 subsys_initcall(netlbl_init);