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  * @doi_walk: enumerate the DOI list
 229  *
 230  * Description:
 231  * This structure is filled out by the CALIPSO engine and passed
 232  * to the NetLabel core via a call to netlbl_calipso_ops_register().
 233  * It enables the CALIPSO engine (and hence IPv6) to be compiled
 234  * as a module.
 235  */
 236 struct netlbl_calipso_ops {
 237         int (*doi_add)(struct calipso_doi *doi_def,
 238                        struct netlbl_audit *audit_info);
 239         void (*doi_free)(struct calipso_doi *doi_def);
 240         int (*doi_remove)(u32 doi, struct netlbl_audit *audit_info);
 241         struct calipso_doi *(*doi_getdef)(u32 doi);
 242         void (*doi_putdef)(struct calipso_doi *doi_def);
 243         int (*doi_walk)(u32 *skip_cnt,
 244                         int (*callback)(struct calipso_doi *doi_def, void *arg),
 245                         void *cb_arg);
 246 };
 247
 248 /*
 249  * LSM security attribute operations (inline)
 250  */
 251
 252 /**
 253  * netlbl_secattr_cache_alloc - Allocate and initialize a secattr cache
 254  * @flags: the memory allocation flags
 255  *
 256  * Description:
 257  * Allocate and initialize a netlbl_lsm_cache structure.  Returns a pointer
 258  * on success, NULL on failure.
 259  *
 260  */
 261 static inline struct netlbl_lsm_cache *netlbl_secattr_cache_alloc(gfp_t flags)
 262 {
 263         struct netlbl_lsm_cache *cache;
 264
 265         cache = kzalloc(sizeof(*cache), flags);
 266         if (cache)
 267                 atomic_set(&cache->refcount, 1);
 268         return cache;
 269 }
 270
 271 /**
 272  * netlbl_secattr_cache_free - Frees a netlbl_lsm_cache struct
 273  * @cache: the struct to free
 274  *
 275  * Description:
 276  * Frees @secattr including all of the internal buffers.
 277  *
 278  */
 279 static inline void netlbl_secattr_cache_free(struct netlbl_lsm_cache *cache)
 280 {
 281         if (!atomic_dec_and_test(&cache->refcount))
 282                 return;
 283
 284         if (cache->free)
 285                 cache->free(cache->data);
 286         kfree(cache);
 287 }
 288
 289 /**
 290  * netlbl_catmap_alloc - Allocate a LSM secattr catmap
 291  * @flags: memory allocation flags
 292  *
 293  * Description:
 294  * Allocate memory for a LSM secattr catmap, returns a pointer on success, NULL
 295  * on failure.
 296  *
 297  */
 298 static inline struct netlbl_lsm_catmap *netlbl_catmap_alloc(gfp_t flags)
 299 {
 300         return kzalloc(sizeof(struct netlbl_lsm_catmap), flags);
 301 }
 302
 303 /**
 304  * netlbl_catmap_free - Free a LSM secattr catmap
 305  * @catmap: the category bitmap
 306  *
 307  * Description:
 308  * Free a LSM secattr catmap.
 309  *
 310  */
 311 static inline void netlbl_catmap_free(struct netlbl_lsm_catmap *catmap)
 312 {
 313         struct netlbl_lsm_catmap *iter;
 314
 315         while (catmap) {
 316                 iter = catmap;
 317                 catmap = catmap->next;
 318                 kfree(iter);
 319         }
 320 }
 321
 322 /**
 323  * netlbl_secattr_init - Initialize a netlbl_lsm_secattr struct
 324  * @secattr: the struct to initialize
 325  *
 326  * Description:
 327  * Initialize an already allocated netlbl_lsm_secattr struct.
 328  *
 329  */
 330 static inline void netlbl_secattr_init(struct netlbl_lsm_secattr *secattr)
 331 {
 332         memset(secattr, 0, sizeof(*secattr));
 333 }
 334
 335 /**
 336  * netlbl_secattr_destroy - Clears a netlbl_lsm_secattr struct
 337  * @secattr: the struct to clear
 338  *
 339  * Description:
 340  * Destroys the @secattr struct, including freeing all of the internal buffers.
 341  * The struct must be reset with a call to netlbl_secattr_init() before reuse.
 342  *
 343  */
 344 static inline void netlbl_secattr_destroy(struct netlbl_lsm_secattr *secattr)
 345 {
 346         if (secattr->flags & NETLBL_SECATTR_FREE_DOMAIN)
 347                 kfree(secattr->domain);
 348         if (secattr->flags & NETLBL_SECATTR_CACHE)
 349                 netlbl_secattr_cache_free(secattr->cache);
 350         if (secattr->flags & NETLBL_SECATTR_MLS_CAT)
 351                 netlbl_catmap_free(secattr->attr.mls.cat);
 352 }
 353
 354 /**
 355  * netlbl_secattr_alloc - Allocate and initialize a netlbl_lsm_secattr struct
 356  * @flags: the memory allocation flags
 357  *
 358  * Description:
 359  * Allocate and initialize a netlbl_lsm_secattr struct.  Returns a valid
 360  * pointer on success, or NULL on failure.
 361  *
 362  */
 363 static inline struct netlbl_lsm_secattr *netlbl_secattr_alloc(gfp_t flags)
 364 {
 365         return kzalloc(sizeof(struct netlbl_lsm_secattr), flags);
 366 }
 367
 368 /**
 369  * netlbl_secattr_free - Frees a netlbl_lsm_secattr struct
 370  * @secattr: the struct to free
 371  *
 372  * Description:
 373  * Frees @secattr including all of the internal buffers.
 374  *
 375  */
 376 static inline void netlbl_secattr_free(struct netlbl_lsm_secattr *secattr)
 377 {
 378         netlbl_secattr_destroy(secattr);
 379         kfree(secattr);
 380 }
 381
 382 #ifdef CONFIG_NETLABEL
 383 /*
 384  * LSM configuration operations
 385  */
 386 int netlbl_cfg_map_del(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_map_add(const char *domain,
 392                              u16 family,
 393                              const void *addr,
 394                              const void *mask,
 395                              struct netlbl_audit *audit_info);
 396 int netlbl_cfg_unlbl_static_add(struct net *net,
 397                                 const char *dev_name,
 398                                 const void *addr,
 399                                 const void *mask,
 400                                 u16 family,
 401                                 u32 secid,
 402                                 struct netlbl_audit *audit_info);
 403 int netlbl_cfg_unlbl_static_del(struct net *net,
 404                                 const char *dev_name,
 405                                 const void *addr,
 406                                 const void *mask,
 407                                 u16 family,
 408                                 struct netlbl_audit *audit_info);
 409 int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def,
 410                            struct netlbl_audit *audit_info);
 411 void netlbl_cfg_cipsov4_del(u32 doi, struct netlbl_audit *audit_info);
 412 int netlbl_cfg_cipsov4_map_add(u32 doi,
 413                                const char *domain,
 414                                const struct in_addr *addr,
 415                                const struct in_addr *mask,
 416                                struct netlbl_audit *audit_info);
 417 /*
 418  * LSM security attribute operations
 419  */
 420 int netlbl_catmap_walk(struct netlbl_lsm_catmap *catmap, u32 offset);
 421 int netlbl_catmap_walkrng(struct netlbl_lsm_catmap *catmap, u32 offset);
 422 int netlbl_catmap_getlong(struct netlbl_lsm_catmap *catmap,
 423                           u32 *offset,
 424                           unsigned long *bitmap);
 425 int netlbl_catmap_setbit(struct netlbl_lsm_catmap **catmap,
 426                          u32 bit,
 427                          gfp_t flags);
 428 int netlbl_catmap_setrng(struct netlbl_lsm_catmap **catmap,
 429                          u32 start,
 430                          u32 end,
 431                          gfp_t flags);
 432 int netlbl_catmap_setlong(struct netlbl_lsm_catmap **catmap,
 433                           u32 offset,
 434                           unsigned long bitmap,
 435                           gfp_t flags);
 436
 437 /*
 438  * LSM protocol operations (NetLabel LSM/kernel API)
 439  */
 440 int netlbl_enabled(void);
 441 int netlbl_sock_setattr(struct sock *sk,
 442                         u16 family,
 443                         const struct netlbl_lsm_secattr *secattr);
 444 void netlbl_sock_delattr(struct sock *sk);
 445 int netlbl_sock_getattr(struct sock *sk,
 446                         struct netlbl_lsm_secattr *secattr);
 447 int netlbl_conn_setattr(struct sock *sk,
 448                         struct sockaddr *addr,
 449                         const struct netlbl_lsm_secattr *secattr);
 450 int netlbl_req_setattr(struct request_sock *req,
 451                        const struct netlbl_lsm_secattr *secattr);
 452 void netlbl_req_delattr(struct request_sock *req);
 453 int netlbl_skbuff_setattr(struct sk_buff *skb,
 454                           u16 family,
 455                           const struct netlbl_lsm_secattr *secattr);
 456 int netlbl_skbuff_getattr(const struct sk_buff *skb,
 457                           u16 family,
 458                           struct netlbl_lsm_secattr *secattr);
 459 void netlbl_skbuff_err(struct sk_buff *skb, int error, int gateway);
 460
 461 /*
 462  * LSM label mapping cache operations
 463  */
 464 void netlbl_cache_invalidate(void);
 465 int netlbl_cache_add(const struct sk_buff *skb,
 466                      const struct netlbl_lsm_secattr *secattr);
 467
 468 /*
 469  * Protocol engine operations
 470  */
 471 struct audit_buffer *netlbl_audit_start(int type,
 472                                         struct netlbl_audit *audit_info);
 473 #else
 474 static inline int netlbl_cfg_map_del(const char *domain,
 475                                      u16 family,
 476                                      const void *addr,
 477                                      const void *mask,
 478                                      struct netlbl_audit *audit_info)
 479 {
 480         return -ENOSYS;
 481 }
 482 static inline int netlbl_cfg_unlbl_map_add(const char *domain,
 483                                            u16 family,
 484                                            void *addr,
 485                                            void *mask,
 486                                            struct netlbl_audit *audit_info)
 487 {
 488         return -ENOSYS;
 489 }
 490 static inline int netlbl_cfg_unlbl_static_add(struct net *net,
 491                                               const char *dev_name,
 492                                               const void *addr,
 493                                               const void *mask,
 494                                               u16 family,
 495                                               u32 secid,
 496                                               struct netlbl_audit *audit_info)
 497 {
 498         return -ENOSYS;
 499 }
 500 static inline int netlbl_cfg_unlbl_static_del(struct net *net,
 501                                               const char *dev_name,
 502                                               const void *addr,
 503                                               const void *mask,
 504                                               u16 family,
 505                                               struct netlbl_audit *audit_info)
 506 {
 507         return -ENOSYS;
 508 }
 509 static inline int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def,
 510                                          struct netlbl_audit *audit_info)
 511 {
 512         return -ENOSYS;
 513 }
 514 static inline void netlbl_cfg_cipsov4_del(u32 doi,
 515                                           struct netlbl_audit *audit_info)
 516 {
 517         return;
 518 }
 519 static inline int netlbl_cfg_cipsov4_map_add(u32 doi,
 520                                              const char *domain,
 521                                              const struct in_addr *addr,
 522                                              const struct in_addr *mask,
 523                                              struct netlbl_audit *audit_info)
 524 {
 525         return -ENOSYS;
 526 }
 527 static inline int netlbl_catmap_walk(struct netlbl_lsm_catmap *catmap,
 528                                      u32 offset)
 529 {
 530         return -ENOENT;
 531 }
 532 static inline int netlbl_catmap_walkrng(struct netlbl_lsm_catmap *catmap,
 533                                         u32 offset)
 534 {
 535         return -ENOENT;
 536 }
 537 static inline int netlbl_catmap_getlong(struct netlbl_lsm_catmap *catmap,
 538                                         u32 *offset,
 539                                         unsigned long *bitmap)
 540 {
 541         return 0;
 542 }
 543 static inline int netlbl_catmap_setbit(struct netlbl_lsm_catmap **catmap,
 544                                        u32 bit,
 545                                        gfp_t flags)
 546 {
 547         return 0;
 548 }
 549 static inline int netlbl_catmap_setrng(struct netlbl_lsm_catmap **catmap,
 550                                        u32 start,
 551                                        u32 end,
 552                                        gfp_t flags)
 553 {
 554         return 0;
 555 }
 556 static inline int netlbl_catmap_setlong(struct netlbl_lsm_catmap **catmap,
 557                                         u32 offset,
 558                                         unsigned long bitmap,
 559                                         gfp_t flags)
 560 {
 561         return 0;
 562 }
 563 static inline int netlbl_enabled(void)
 564 {
 565         return 0;
 566 }
 567 static inline int netlbl_sock_setattr(struct sock *sk,
 568                                       u16 family,
 569                                       const struct netlbl_lsm_secattr *secattr)
 570 {
 571         return -ENOSYS;
 572 }
 573 static inline void netlbl_sock_delattr(struct sock *sk)
 574 {
 575 }
 576 static inline int netlbl_sock_getattr(struct sock *sk,
 577                                       struct netlbl_lsm_secattr *secattr)
 578 {
 579         return -ENOSYS;
 580 }
 581 static inline int netlbl_conn_setattr(struct sock *sk,
 582                                       struct sockaddr *addr,
 583                                       const struct netlbl_lsm_secattr *secattr)
 584 {
 585         return -ENOSYS;
 586 }
 587 static inline int netlbl_req_setattr(struct request_sock *req,
 588                                      const struct netlbl_lsm_secattr *secattr)
 589 {
 590         return -ENOSYS;
 591 }
 592 static inline void netlbl_req_delattr(struct request_sock *req)
 593 {
 594         return;
 595 }
 596 static inline int netlbl_skbuff_setattr(struct sk_buff *skb,
 597                                       u16 family,
 598                                       const struct netlbl_lsm_secattr *secattr)
 599 {
 600         return -ENOSYS;
 601 }
 602 static inline int netlbl_skbuff_getattr(const struct sk_buff *skb,
 603                                         u16 family,
 604                                         struct netlbl_lsm_secattr *secattr)
 605 {
 606         return -ENOSYS;
 607 }
 608 static inline void netlbl_skbuff_err(struct sk_buff *skb,
 609                                      int error,
 610                                      int gateway)
 611 {
 612         return;
 613 }
 614 static inline void netlbl_cache_invalidate(void)
 615 {
 616         return;
 617 }
 618 static inline int netlbl_cache_add(const struct sk_buff *skb,
 619                                    const struct netlbl_lsm_secattr *secattr)
 620 {
 621         return 0;
 622 }
 623 static inline struct audit_buffer *netlbl_audit_start(int type,
 624                                                 struct netlbl_audit *audit_info)
 625 {
 626         return NULL;
 627 }
 628 #endif /* CONFIG_NETLABEL */
 629
 630 const struct netlbl_calipso_ops *
 631 netlbl_calipso_ops_register(const struct netlbl_calipso_ops *ops);
 632
 633 #endif /* _NETLABEL_H */