include/net/netlabel.h

   1 /*
   2  * NetLabel System
   3  *
   4  * The NetLabel system manages static and dynamic label mappings for network
   5  * protocols such as CIPSO and RIPSO.
   6  *
   7  * Author: Paul Moore <paul@paul-moore.com>
   8  *
   9  */
  10
  11 /*
  12  * (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008
  13  *
  14  * This program is free software;  you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY;  without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  22  * the GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program;  if not, see <http://www.gnu.org/licenses/>.
  26  *
  27  */
  28
  29 #ifndef _NETLABEL_H
  30 #define _NETLABEL_H
  31
  32 #include <linux/types.h>
  33 #include <linux/slab.h>
  34 #include <linux/net.h>
  35 #include <linux/skbuff.h>
  36 #include <linux/in.h>
  37 #include <linux/in6.h>
  38 #include <net/netlink.h>
  39 #include <net/request_sock.h>
  40 #include <linux/atomic.h>
  41
  42 struct cipso_v4_doi;
  43 struct calipso_doi;
  44
  45 /*
  46  * NetLabel - A management interface for maintaining network packet label
  47  *            mapping tables for explicit packet labling protocols.
  48  *
  49  * Network protocols such as CIPSO and RIPSO require a label translation layer
  50  * to convert the label on the packet into something meaningful on the host
  51  * machine.  In the current Linux implementation these mapping tables live
  52  * inside the kernel; NetLabel provides a mechanism for user space applications
  53  * to manage these mapping tables.
  54  *
  55  * NetLabel makes use of the Generic NETLINK mechanism as a transport layer to
  56  * send messages between kernel and user space.  The general format of a
  57  * NetLabel message is shown below:
  58  *
  59  *  +-----------------+-------------------+--------- --- -- -
  60  *  | struct nlmsghdr | struct genlmsghdr | payload
  61  *  +-----------------+-------------------+--------- --- -- -
  62  *
  63  * The 'nlmsghdr' and 'genlmsghdr' structs should be dealt with like normal.
  64  * The payload is dependent on the subsystem specified in the
  65  * 'nlmsghdr->nlmsg_type' and should be defined below, supporting functions
  66  * should be defined in the corresponding net/netlabel/netlabel_<subsys>.h|c
  67  * file.  All of the fields in the NetLabel payload are NETLINK attributes, see
  68  * the include/net/netlink.h file for more information on NETLINK attributes.
  69  *
  70  */
  71
  72 /*
  73  * NetLabel NETLINK protocol
  74  */
  75
  76 /* NetLabel NETLINK protocol version
  77  *  1: initial version
  78  *  2: added static labels for unlabeled connections
  79  *  3: network selectors added to the NetLabel/LSM domain mapping and the
  80  *     CIPSO_V4_MAP_LOCAL CIPSO mapping was added
  81  */
  82 #define NETLBL_PROTO_VERSION            3
  83
  84 /* NetLabel NETLINK types/families */
  85 #define NETLBL_NLTYPE_NONE              0
  86 #define NETLBL_NLTYPE_MGMT              1
  87 #define NETLBL_NLTYPE_MGMT_NAME         "NLBL_MGMT"
  88 #define NETLBL_NLTYPE_RIPSO             2
  89 #define NETLBL_NLTYPE_RIPSO_NAME        "NLBL_RIPSO"
  90 #define NETLBL_NLTYPE_CIPSOV4           3
  91 #define NETLBL_NLTYPE_CIPSOV4_NAME      "NLBL_CIPSOv4"
  92 #define NETLBL_NLTYPE_CIPSOV6           4
  93 #define NETLBL_NLTYPE_CIPSOV6_NAME      "NLBL_CIPSOv6"
  94 #define NETLBL_NLTYPE_UNLABELED         5
  95 #define NETLBL_NLTYPE_UNLABELED_NAME    "NLBL_UNLBL"
  96 #define NETLBL_NLTYPE_ADDRSELECT        6
  97 #define NETLBL_NLTYPE_ADDRSELECT_NAME   "NLBL_ADRSEL"
  98 #define NETLBL_NLTYPE_CALIPSO           7
  99 #define NETLBL_NLTYPE_CALIPSO_NAME      "NLBL_CALIPSO"
 100
 101 /*
 102  * NetLabel - Kernel API for accessing the network packet label mappings.
 103  *
 104  * The following functions are provided for use by other kernel modules,
 105  * specifically kernel LSM modules, to provide a consistent, transparent API
 106  * for dealing with explicit packet labeling protocols such as CIPSO and
 107  * RIPSO.  The functions defined here are implemented in the
 108  * net/netlabel/netlabel_kapi.c file.
 109  *
 110  */
 111
 112 /* NetLabel audit information */
 113 struct netlbl_audit {
 114         u32 secid;
 115         kuid_t loginuid;
 116         unsigned int sessionid;
 117 };
 118
 119 /*
 120  * LSM security attributes
 121  */
 122
 123 /**
 124  * struct netlbl_lsm_cache - NetLabel LSM security attribute cache
 125  * @refcount: atomic reference counter
 126  * @free: LSM supplied function to free the cache data
 127  * @data: LSM supplied cache data
 128  *
 129  * Description:
 130  * This structure is provided for LSMs which wish to make use of the NetLabel
 131  * caching mechanism to store LSM specific data/attributes in the NetLabel
 132  * cache.  If the LSM has to perform a lot of translation from the NetLabel
 133  * security attributes into it's own internal representation then the cache
 134  * mechanism can provide a way to eliminate some or all of that translation
 135  * overhead on a cache hit.
 136  *
 137  */
 138 struct netlbl_lsm_cache {
 139         atomic_t refcount;
 140         void (*free) (const void *data);
 141         void *data;
 142 };
 143
 144 /**
 145  * struct netlbl_lsm_catmap - NetLabel LSM secattr category bitmap
 146  * @startbit: the value of the lowest order bit in the bitmap
 147  * @bitmap: the category bitmap
 148  * @next: pointer to the next bitmap "node" or NULL
 149  *
 150  * Description:
 151  * This structure is used to represent category bitmaps.  Due to the large
 152  * number of categories supported by most labeling protocols it is not
 153  * practical to transfer a full bitmap internally so NetLabel adopts a sparse
 154  * bitmap structure modeled after SELinux's ebitmap structure.
 155  * The catmap bitmap field MUST be a power of two in length and large
 156  * enough to hold at least 240 bits.  Special care (i.e. check the code!)
 157  * should be used when changing these values as the LSM implementation
 158  * probably has functions which rely on the sizes of these types to speed
 159  * processing.
 160  *
 161  */
 162 #define NETLBL_CATMAP_MAPTYPE           u64
 163 #define NETLBL_CATMAP_MAPCNT            4
 164 #define NETLBL_CATMAP_MAPSIZE           (sizeof(NETLBL_CATMAP_MAPTYPE) * 8)
 165 #define NETLBL_CATMAP_SIZE              (NETLBL_CATMAP_MAPSIZE * \
 166                                          NETLBL_CATMAP_MAPCNT)
 167 #define NETLBL_CATMAP_BIT               (NETLBL_CATMAP_MAPTYPE)0x01
 168 struct netlbl_lsm_catmap {
 169         u32 startbit;
 170         NETLBL_CATMAP_MAPTYPE bitmap[NETLBL_CATMAP_MAPCNT];
 171         struct netlbl_lsm_catmap *next;
 172 };
 173
 174 /**
 175  * struct netlbl_lsm_secattr - NetLabel LSM security attributes
 176  * @flags: indicate structure attributes, see NETLBL_SECATTR_*
 177  * @type: indicate the NLTYPE of the attributes
 178  * @domain: the NetLabel LSM domain
 179  * @cache: NetLabel LSM specific cache
 180  * @attr.mls: MLS sensitivity label
 181  * @attr.mls.cat: MLS category bitmap
 182  * @attr.mls.lvl: MLS sensitivity level
 183  * @attr.secid: LSM specific secid token
 184  *
 185  * Description:
 186  * This structure is used to pass security attributes between NetLabel and the
 187  * LSM modules.  The flags field is used to specify which fields within the
 188  * struct are valid and valid values can be created by bitwise OR'ing the
 189  * NETLBL_SECATTR_* defines.  The domain field is typically set by the LSM to
 190  * specify domain specific configuration settings and is not usually used by
 191  * NetLabel itself when returning security attributes to the LSM.
 192  *
 193  */
 194 struct netlbl_lsm_secattr {
 195         u32 flags;
 196         /* bitmap values for 'flags' */
 197 #define NETLBL_SECATTR_NONE             0x00000000
 198 #define NETLBL_SECATTR_DOMAIN           0x00000001
 199 #define NETLBL_SECATTR_DOMAIN_CPY       (NETLBL_SECATTR_DOMAIN | \
 200                                          NETLBL_SECATTR_FREE_DOMAIN)
 201 #define NETLBL_SECATTR_CACHE            0x00000002
 202 #define NETLBL_SECATTR_MLS_LVL          0x00000004
 203 #define NETLBL_SECATTR_MLS_CAT          0x00000008
 204 #define NETLBL_SECATTR_SECID            0x00000010
 205         /* bitmap meta-values for 'flags' */
 206 #define NETLBL_SECATTR_FREE_DOMAIN      0x01000000
 207 #define NETLBL_SECATTR_CACHEABLE        (NETLBL_SECATTR_MLS_LVL | \
 208                                          NETLBL_SECATTR_MLS_CAT | \
 209                                          NETLBL_SECATTR_SECID)
 210         u32 type;
 211         char *domain;
 212         struct netlbl_lsm_cache *cache;
 213         struct {
 214                 struct {
 215                         struct netlbl_lsm_catmap *cat;
 216                         u32 lvl;
 217                 } mls;
 218                 u32 secid;
 219         } attr;
 220 };
 221
 222 /**
 223  * struct netlbl_calipso_ops - NetLabel CALIPSO operations
 224  * @doi_add: add a CALIPSO DOI
 225  * @doi_free: free a CALIPSO DOI
 226  * @doi_getdef: returns a reference to a DOI
 227  * @doi_putdef: releases a reference of a DOI
 228  *
 229  * Description:
 230  * This structure is filled out by the CALIPSO engine and passed
 231  * to the NetLabel core via a call to netlbl_calipso_ops_register().
 232  * It enables the CALIPSO engine (and hence IPv6) to be compiled
 233  * as a module.
 234  */
 235 struct netlbl_calipso_ops {
 236         int (*doi_add)(struct calipso_doi *doi_def,
 237                        struct netlbl_audit *audit_info);
 238         void (*doi_free)(struct calipso_doi *doi_def);
 239         struct calipso_doi *(*doi_getdef)(u32 doi);
 240         void (*doi_putdef)(struct calipso_doi *doi_def);
 241 };
 242
 243 /*
 244  * LSM security attribute operations (inline)
 245  */
 246
 247 /**
 248  * netlbl_secattr_cache_alloc - Allocate and initialize a secattr cache
 249  * @flags: the memory allocation flags
 250  *
 251  * Description:
 252  * Allocate and initialize a netlbl_lsm_cache structure.  Returns a pointer
 253  * on success, NULL on failure.
 254  *
 255  */
 256 static inline struct netlbl_lsm_cache *netlbl_secattr_cache_alloc(gfp_t flags)
 257 {
 258         struct netlbl_lsm_cache *cache;
 259
 260         cache = kzalloc(sizeof(*cache), flags);
 261         if (cache)
 262                 atomic_set(&cache->refcount, 1);
 263         return cache;
 264 }
 265
 266 /**
 267  * netlbl_secattr_cache_free - Frees a netlbl_lsm_cache struct
 268  * @cache: the struct to free
 269  *
 270  * Description:
 271  * Frees @secattr including all of the internal buffers.
 272  *
 273  */
 274 static inline void netlbl_secattr_cache_free(struct netlbl_lsm_cache *cache)
 275 {
 276         if (!atomic_dec_and_test(&cache->refcount))
 277                 return;
 278
 279         if (cache->free)
 280                 cache->free(cache->data);
 281         kfree(cache);
 282 }
 283
 284 /**
 285  * netlbl_catmap_alloc - Allocate a LSM secattr catmap
 286  * @flags: memory allocation flags
 287  *
 288  * Description:
 289  * Allocate memory for a LSM secattr catmap, returns a pointer on success, NULL
 290  * on failure.
 291  *
 292  */
 293 static inline struct netlbl_lsm_catmap *netlbl_catmap_alloc(gfp_t flags)
 294 {
 295         return kzalloc(sizeof(struct netlbl_lsm_catmap), flags);
 296 }
 297
 298 /**
 299  * netlbl_catmap_free - Free a LSM secattr catmap
 300  * @catmap: the category bitmap
 301  *
 302  * Description:
 303  * Free a LSM secattr catmap.
 304  *
 305  */
 306 static inline void netlbl_catmap_free(struct netlbl_lsm_catmap *catmap)
 307 {
 308         struct netlbl_lsm_catmap *iter;
 309
 310         while (catmap) {
 311                 iter = catmap;
 312                 catmap = catmap->next;
 313                 kfree(iter);
 314         }
 315 }
 316
 317 /**
 318  * netlbl_secattr_init - Initialize a netlbl_lsm_secattr struct
 319  * @secattr: the struct to initialize
 320  *
 321  * Description:
 322  * Initialize an already allocated netlbl_lsm_secattr struct.
 323  *
 324  */
 325 static inline void netlbl_secattr_init(struct netlbl_lsm_secattr *secattr)
 326 {
 327         memset(secattr, 0, sizeof(*secattr));
 328 }
 329
 330 /**
 331  * netlbl_secattr_destroy - Clears a netlbl_lsm_secattr struct
 332  * @secattr: the struct to clear
 333  *
 334  * Description:
 335  * Destroys the @secattr struct, including freeing all of the internal buffers.
 336  * The struct must be reset with a call to netlbl_secattr_init() before reuse.
 337  *
 338  */
 339 static inline void netlbl_secattr_destroy(struct netlbl_lsm_secattr *secattr)
 340 {
 341         if (secattr->flags & NETLBL_SECATTR_FREE_DOMAIN)
 342                 kfree(secattr->domain);
 343         if (secattr->flags & NETLBL_SECATTR_CACHE)
 344                 netlbl_secattr_cache_free(secattr->cache);
 345         if (secattr->flags & NETLBL_SECATTR_MLS_CAT)
 346                 netlbl_catmap_free(secattr->attr.mls.cat);
 347 }
 348
 349 /**
 350  * netlbl_secattr_alloc - Allocate and initialize a netlbl_lsm_secattr struct
 351  * @flags: the memory allocation flags
 352  *
 353  * Description:
 354  * Allocate and initialize a netlbl_lsm_secattr struct.  Returns a valid
 355  * pointer on success, or NULL on failure.
 356  *
 357  */
 358 static inline struct netlbl_lsm_secattr *netlbl_secattr_alloc(gfp_t flags)
 359 {
 360         return kzalloc(sizeof(struct netlbl_lsm_secattr), flags);
 361 }
 362
 363 /**
 364  * netlbl_secattr_free - Frees a netlbl_lsm_secattr struct
 365  * @secattr: the struct to free
 366  *
 367  * Description:
 368  * Frees @secattr including all of the internal buffers.
 369  *
 370  */
 371 static inline void netlbl_secattr_free(struct netlbl_lsm_secattr *secattr)
 372 {
 373         netlbl_secattr_destroy(secattr);
 374         kfree(secattr);
 375 }
 376
 377 #ifdef CONFIG_NETLABEL
 378 /*
 379  * LSM configuration operations
 380  */
 381 int netlbl_cfg_map_del(const char *domain,
 382                        u16 family,
 383                        const void *addr,
 384                        const void *mask,
 385                        struct netlbl_audit *audit_info);
 386 int netlbl_cfg_unlbl_map_add(const char *domain,
 387                              u16 family,
 388                              const void *addr,
 389                              const void *mask,
 390                              struct netlbl_audit *audit_info);
 391 int netlbl_cfg_unlbl_static_add(struct net *net,
 392                                 const char *dev_name,
 393                                 const void *addr,
 394                                 const void *mask,
 395                                 u16 family,
 396                                 u32 secid,
 397                                 struct netlbl_audit *audit_info);
 398 int netlbl_cfg_unlbl_static_del(struct net *net,
 399                                 const char *dev_name,
 400                                 const void *addr,
 401                                 const void *mask,
 402                                 u16 family,
 403                                 struct netlbl_audit *audit_info);
 404 int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def,
 405                            struct netlbl_audit *audit_info);
 406 void netlbl_cfg_cipsov4_del(u32 doi, struct netlbl_audit *audit_info);
 407 int netlbl_cfg_cipsov4_map_add(u32 doi,
 408                                const char *domain,
 409                                const struct in_addr *addr,
 410                                const struct in_addr *mask,
 411                                struct netlbl_audit *audit_info);
 412 /*
 413  * LSM security attribute operations
 414  */
 415 int netlbl_catmap_walk(struct netlbl_lsm_catmap *catmap, u32 offset);
 416 int netlbl_catmap_walkrng(struct netlbl_lsm_catmap *catmap, u32 offset);
 417 int netlbl_catmap_getlong(struct netlbl_lsm_catmap *catmap,
 418                           u32 *offset,
 419                           unsigned long *bitmap);
 420 int netlbl_catmap_setbit(struct netlbl_lsm_catmap **catmap,
 421                          u32 bit,
 422                          gfp_t flags);
 423 int netlbl_catmap_setrng(struct netlbl_lsm_catmap **catmap,
 424                          u32 start,
 425                          u32 end,
 426                          gfp_t flags);
 427 int netlbl_catmap_setlong(struct netlbl_lsm_catmap **catmap,
 428                           u32 offset,
 429                           unsigned long bitmap,
 430                           gfp_t flags);
 431
 432 /*
 433  * LSM protocol operations (NetLabel LSM/kernel API)
 434  */
 435 int netlbl_enabled(void);
 436 int netlbl_sock_setattr(struct sock *sk,
 437                         u16 family,
 438                         const struct netlbl_lsm_secattr *secattr);
 439 void netlbl_sock_delattr(struct sock *sk);
 440 int netlbl_sock_getattr(struct sock *sk,
 441                         struct netlbl_lsm_secattr *secattr);
 442 int netlbl_conn_setattr(struct sock *sk,
 443                         struct sockaddr *addr,
 444                         const struct netlbl_lsm_secattr *secattr);
 445 int netlbl_req_setattr(struct request_sock *req,
 446                        const struct netlbl_lsm_secattr *secattr);
 447 void netlbl_req_delattr(struct request_sock *req);
 448 int netlbl_skbuff_setattr(struct sk_buff *skb,
 449                           u16 family,
 450                           const struct netlbl_lsm_secattr *secattr);
 451 int netlbl_skbuff_getattr(const struct sk_buff *skb,
 452                           u16 family,
 453                           struct netlbl_lsm_secattr *secattr);
 454 void netlbl_skbuff_err(struct sk_buff *skb, int error, int gateway);
 455
 456 /*
 457  * LSM label mapping cache operations
 458  */
 459 void netlbl_cache_invalidate(void);
 460 int netlbl_cache_add(const struct sk_buff *skb,
 461                      const struct netlbl_lsm_secattr *secattr);
 462
 463 /*
 464  * Protocol engine operations
 465  */
 466 struct audit_buffer *netlbl_audit_start(int type,
 467                                         struct netlbl_audit *audit_info);
 468 #else
 469 static inline int netlbl_cfg_map_del(const char *domain,
 470                                      u16 family,
 471                                      const void *addr,
 472                                      const void *mask,
 473                                      struct netlbl_audit *audit_info)
 474 {
 475         return -ENOSYS;
 476 }
 477 static inline int netlbl_cfg_unlbl_map_add(const char *domain,
 478                                            u16 family,
 479                                            void *addr,
 480                                            void *mask,
 481                                            struct netlbl_audit *audit_info)
 482 {
 483         return -ENOSYS;
 484 }
 485 static inline int netlbl_cfg_unlbl_static_add(struct net *net,
 486                                               const char *dev_name,
 487                                               const void *addr,
 488                                               const void *mask,
 489                                               u16 family,
 490                                               u32 secid,
 491                                               struct netlbl_audit *audit_info)
 492 {
 493         return -ENOSYS;
 494 }
 495 static inline int netlbl_cfg_unlbl_static_del(struct net *net,
 496                                               const char *dev_name,
 497                                               const void *addr,
 498                                               const void *mask,
 499                                               u16 family,
 500                                               struct netlbl_audit *audit_info)
 501 {
 502         return -ENOSYS;
 503 }
 504 static inline int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def,
 505                                          struct netlbl_audit *audit_info)
 506 {
 507         return -ENOSYS;
 508 }
 509 static inline void netlbl_cfg_cipsov4_del(u32 doi,
 510                                           struct netlbl_audit *audit_info)
 511 {
 512         return;
 513 }
 514 static inline int netlbl_cfg_cipsov4_map_add(u32 doi,
 515                                              const char *domain,
 516                                              const struct in_addr *addr,
 517                                              const struct in_addr *mask,
 518                                              struct netlbl_audit *audit_info)
 519 {
 520         return -ENOSYS;
 521 }
 522 static inline int netlbl_catmap_walk(struct netlbl_lsm_catmap *catmap,
 523                                      u32 offset)
 524 {
 525         return -ENOENT;
 526 }
 527 static inline int netlbl_catmap_walkrng(struct netlbl_lsm_catmap *catmap,
 528                                         u32 offset)
 529 {
 530         return -ENOENT;
 531 }
 532 static inline int netlbl_catmap_getlong(struct netlbl_lsm_catmap *catmap,
 533                                         u32 *offset,
 534                                         unsigned long *bitmap)
 535 {
 536         return 0;
 537 }
 538 static inline int netlbl_catmap_setbit(struct netlbl_lsm_catmap **catmap,
 539                                        u32 bit,
 540                                        gfp_t flags)
 541 {
 542         return 0;
 543 }
 544 static inline int netlbl_catmap_setrng(struct netlbl_lsm_catmap **catmap,
 545                                        u32 start,
 546                                        u32 end,
 547                                        gfp_t flags)
 548 {
 549         return 0;
 550 }
 551 static inline int netlbl_catmap_setlong(struct netlbl_lsm_catmap **catmap,
 552                                         u32 offset,
 553                                         unsigned long bitmap,
 554                                         gfp_t flags)
 555 {
 556         return 0;
 557 }
 558 static inline int netlbl_enabled(void)
 559 {
 560         return 0;
 561 }
 562 static inline int netlbl_sock_setattr(struct sock *sk,
 563                                       u16 family,
 564                                       const struct netlbl_lsm_secattr *secattr)
 565 {
 566         return -ENOSYS;
 567 }
 568 static inline void netlbl_sock_delattr(struct sock *sk)
 569 {
 570 }
 571 static inline int netlbl_sock_getattr(struct sock *sk,
 572                                       struct netlbl_lsm_secattr *secattr)
 573 {
 574         return -ENOSYS;
 575 }
 576 static inline int netlbl_conn_setattr(struct sock *sk,
 577                                       struct sockaddr *addr,
 578                                       const struct netlbl_lsm_secattr *secattr)
 579 {
 580         return -ENOSYS;
 581 }
 582 static inline int netlbl_req_setattr(struct request_sock *req,
 583                                      const struct netlbl_lsm_secattr *secattr)
 584 {
 585         return -ENOSYS;
 586 }
 587 static inline void netlbl_req_delattr(struct request_sock *req)
 588 {
 589         return;
 590 }
 591 static inline int netlbl_skbuff_setattr(struct sk_buff *skb,
 592                                       u16 family,
 593                                       const struct netlbl_lsm_secattr *secattr)
 594 {
 595         return -ENOSYS;
 596 }
 597 static inline int netlbl_skbuff_getattr(const struct sk_buff *skb,
 598                                         u16 family,
 599                                         struct netlbl_lsm_secattr *secattr)
 600 {
 601         return -ENOSYS;
 602 }
 603 static inline void netlbl_skbuff_err(struct sk_buff *skb,
 604                                      int error,
 605                                      int gateway)
 606 {
 607         return;
 608 }
 609 static inline void netlbl_cache_invalidate(void)
 610 {
 611         return;
 612 }
 613 static inline int netlbl_cache_add(const struct sk_buff *skb,
 614                                    const struct netlbl_lsm_secattr *secattr)
 615 {
 616         return 0;
 617 }
 618 static inline struct audit_buffer *netlbl_audit_start(int type,
 619                                                 struct netlbl_audit *audit_info)
 620 {
 621         return NULL;
 622 }
 623 #endif /* CONFIG_NETLABEL */
 624
 625 const struct netlbl_calipso_ops *
 626 netlbl_calipso_ops_register(const struct netlbl_calipso_ops *ops);
 627
 628 #endif /* _NETLABEL_H */