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.moore@hp.com> 8 * 9 */ 10 11 /* 12 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006 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, write to the Free Software 26 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 27 * 28 */ 29 30 #ifndef _NETLABEL_H 31 #define _NETLABEL_H 32 33 #include <linux/types.h> 34 #include <linux/net.h> 35 #include <linux/skbuff.h> 36 #include <net/netlink.h> 37 #include <asm/atomic.h> 38 39 /* 40 * NetLabel - A management interface for maintaining network packet label 41 * mapping tables for explicit packet labling protocols. 42 * 43 * Network protocols such as CIPSO and RIPSO require a label translation layer 44 * to convert the label on the packet into something meaningful on the host 45 * machine. In the current Linux implementation these mapping tables live 46 * inside the kernel; NetLabel provides a mechanism for user space applications 47 * to manage these mapping tables. 48 * 49 * NetLabel makes use of the Generic NETLINK mechanism as a transport layer to 50 * send messages between kernel and user space. The general format of a 51 * NetLabel message is shown below: 52 * 53 * +-----------------+-------------------+--------- --- -- - 54 * | struct nlmsghdr | struct genlmsghdr | payload 55 * +-----------------+-------------------+--------- --- -- - 56 * 57 * The 'nlmsghdr' and 'genlmsghdr' structs should be dealt with like normal. 58 * The payload is dependent on the subsystem specified in the 59 * 'nlmsghdr->nlmsg_type' and should be defined below, supporting functions 60 * should be defined in the corresponding net/netlabel/netlabel_<subsys>.h|c 61 * file. All of the fields in the NetLabel payload are NETLINK attributes, see 62 * the include/net/netlink.h file for more information on NETLINK attributes. 63 * 64 */ 65 66 /* 67 * NetLabel NETLINK protocol 68 */ 69 70 #define NETLBL_PROTO_VERSION 1 71 72 /* NetLabel NETLINK types/families */ 73 #define NETLBL_NLTYPE_NONE 0 74 #define NETLBL_NLTYPE_MGMT 1 75 #define NETLBL_NLTYPE_MGMT_NAME "NLBL_MGMT" 76 #define NETLBL_NLTYPE_RIPSO 2 77 #define NETLBL_NLTYPE_RIPSO_NAME "NLBL_RIPSO" 78 #define NETLBL_NLTYPE_CIPSOV4 3 79 #define NETLBL_NLTYPE_CIPSOV4_NAME "NLBL_CIPSOv4" 80 #define NETLBL_NLTYPE_CIPSOV6 4 81 #define NETLBL_NLTYPE_CIPSOV6_NAME "NLBL_CIPSOv6" 82 #define NETLBL_NLTYPE_UNLABELED 5 83 #define NETLBL_NLTYPE_UNLABELED_NAME "NLBL_UNLBL" 84 85 /* 86 * NetLabel - Kernel API for accessing the network packet label mappings. 87 * 88 * The following functions are provided for use by other kernel modules, 89 * specifically kernel LSM modules, to provide a consistent, transparent API 90 * for dealing with explicit packet labeling protocols such as CIPSO and 91 * RIPSO. The functions defined here are implemented in the 92 * net/netlabel/netlabel_kapi.c file. 93 * 94 */ 95 96 /* NetLabel audit information */ 97 struct netlbl_audit { 98 u32 secid; 99 uid_t loginuid; 100 }; 101 102 /* Domain mapping definition struct */ 103 struct netlbl_dom_map; 104 105 /* Domain mapping operations */ 106 int netlbl_domhsh_remove(const char *domain, struct netlbl_audit *audit_info); 107 108 /* LSM security attributes */ 109 struct netlbl_lsm_cache { 110 atomic_t refcount; 111 void (*free) (const void *data); 112 void *data; 113 }; 114 /* The catmap bitmap field MUST be a power of two in length and large 115 * enough to hold at least 240 bits. Special care (i.e. check the code!) 116 * should be used when changing these values as the LSM implementation 117 * probably has functions which rely on the sizes of these types to speed 118 * processing. */ 119 #define NETLBL_CATMAP_MAPTYPE u64 120 #define NETLBL_CATMAP_MAPCNT 4 121 #define NETLBL_CATMAP_MAPSIZE (sizeof(NETLBL_CATMAP_MAPTYPE) * 8) 122 #define NETLBL_CATMAP_SIZE (NETLBL_CATMAP_MAPSIZE * \ 123 NETLBL_CATMAP_MAPCNT) 124 #define NETLBL_CATMAP_BIT (NETLBL_CATMAP_MAPTYPE)0x01 125 struct netlbl_lsm_secattr_catmap { 126 u32 startbit; 127 NETLBL_CATMAP_MAPTYPE bitmap[NETLBL_CATMAP_MAPCNT]; 128 struct netlbl_lsm_secattr_catmap *next; 129 }; 130 #define NETLBL_SECATTR_NONE 0x00000000 131 #define NETLBL_SECATTR_DOMAIN 0x00000001 132 #define NETLBL_SECATTR_CACHE 0x00000002 133 #define NETLBL_SECATTR_MLS_LVL 0x00000004 134 #define NETLBL_SECATTR_MLS_CAT 0x00000008 135 struct netlbl_lsm_secattr { 136 u32 flags; 137 138 char *domain; 139 140 u32 mls_lvl; 141 struct netlbl_lsm_secattr_catmap *mls_cat; 142 143 struct netlbl_lsm_cache *cache; 144 }; 145 146 /* 147 * LSM security attribute operations 148 */ 149 150 151 /** 152 * netlbl_secattr_cache_alloc - Allocate and initialize a secattr cache 153 * @flags: the memory allocation flags 154 * 155 * Description: 156 * Allocate and initialize a netlbl_lsm_cache structure. Returns a pointer 157 * on success, NULL on failure. 158 * 159 */ 160 static inline struct netlbl_lsm_cache *netlbl_secattr_cache_alloc(gfp_t flags) 161 { 162 struct netlbl_lsm_cache *cache; 163 164 cache = kzalloc(sizeof(*cache), flags); 165 if (cache) 166 atomic_set(&cache->refcount, 1); 167 return cache; 168 } 169 170 /** 171 * netlbl_secattr_cache_free - Frees a netlbl_lsm_cache struct 172 * @cache: the struct to free 173 * 174 * Description: 175 * Frees @secattr including all of the internal buffers. 176 * 177 */ 178 static inline void netlbl_secattr_cache_free(struct netlbl_lsm_cache *cache) 179 { 180 if (!atomic_dec_and_test(&cache->refcount)) 181 return; 182 183 if (cache->free) 184 cache->free(cache->data); 185 kfree(cache); 186 } 187 188 /** 189 * netlbl_secattr_catmap_alloc - Allocate a LSM secattr catmap 190 * @flags: memory allocation flags 191 * 192 * Description: 193 * Allocate memory for a LSM secattr catmap, returns a pointer on success, NULL 194 * on failure. 195 * 196 */ 197 static inline struct netlbl_lsm_secattr_catmap *netlbl_secattr_catmap_alloc( 198 gfp_t flags) 199 { 200 return kzalloc(sizeof(struct netlbl_lsm_secattr_catmap), flags); 201 } 202 203 /** 204 * netlbl_secattr_catmap_free - Free a LSM secattr catmap 205 * @catmap: the category bitmap 206 * 207 * Description: 208 * Free a LSM secattr catmap. 209 * 210 */ 211 static inline void netlbl_secattr_catmap_free( 212 struct netlbl_lsm_secattr_catmap *catmap) 213 { 214 struct netlbl_lsm_secattr_catmap *iter; 215 216 do { 217 iter = catmap; 218 catmap = catmap->next; 219 kfree(iter); 220 } while (catmap); 221 } 222 223 /** 224 * netlbl_secattr_init - Initialize a netlbl_lsm_secattr struct 225 * @secattr: the struct to initialize 226 * 227 * Description: 228 * Initialize an already allocated netlbl_lsm_secattr struct. 229 * 230 */ 231 static inline void netlbl_secattr_init(struct netlbl_lsm_secattr *secattr) 232 { 233 secattr->flags = 0; 234 secattr->domain = NULL; 235 secattr->mls_cat = NULL; 236 secattr->cache = NULL; 237 } 238 239 /** 240 * netlbl_secattr_destroy - Clears a netlbl_lsm_secattr struct 241 * @secattr: the struct to clear 242 * 243 * Description: 244 * Destroys the @secattr struct, including freeing all of the internal buffers. 245 * The struct must be reset with a call to netlbl_secattr_init() before reuse. 246 * 247 */ 248 static inline void netlbl_secattr_destroy(struct netlbl_lsm_secattr *secattr) 249 { 250 if (secattr->cache) 251 netlbl_secattr_cache_free(secattr->cache); 252 kfree(secattr->domain); 253 if (secattr->mls_cat) 254 netlbl_secattr_catmap_free(secattr->mls_cat); 255 } 256 257 /** 258 * netlbl_secattr_alloc - Allocate and initialize a netlbl_lsm_secattr struct 259 * @flags: the memory allocation flags 260 * 261 * Description: 262 * Allocate and initialize a netlbl_lsm_secattr struct. Returns a valid 263 * pointer on success, or NULL on failure. 264 * 265 */ 266 static inline struct netlbl_lsm_secattr *netlbl_secattr_alloc(gfp_t flags) 267 { 268 return kzalloc(sizeof(struct netlbl_lsm_secattr), flags); 269 } 270 271 /** 272 * netlbl_secattr_free - Frees a netlbl_lsm_secattr struct 273 * @secattr: the struct to free 274 * 275 * Description: 276 * Frees @secattr including all of the internal buffers. 277 * 278 */ 279 static inline void netlbl_secattr_free(struct netlbl_lsm_secattr *secattr) 280 { 281 netlbl_secattr_destroy(secattr); 282 kfree(secattr); 283 } 284 285 #ifdef CONFIG_NETLABEL 286 int netlbl_secattr_catmap_walk(struct netlbl_lsm_secattr_catmap *catmap, 287 u32 offset); 288 int netlbl_secattr_catmap_walk_rng(struct netlbl_lsm_secattr_catmap *catmap, 289 u32 offset); 290 int netlbl_secattr_catmap_setbit(struct netlbl_lsm_secattr_catmap *catmap, 291 u32 bit, 292 gfp_t flags); 293 int netlbl_secattr_catmap_setrng(struct netlbl_lsm_secattr_catmap *catmap, 294 u32 start, 295 u32 end, 296 gfp_t flags); 297 #else 298 static inline int netlbl_secattr_catmap_walk( 299 struct netlbl_lsm_secattr_catmap *catmap, 300 u32 offset) 301 { 302 return -ENOENT; 303 } 304 305 static inline int netlbl_secattr_catmap_walk_rng( 306 struct netlbl_lsm_secattr_catmap *catmap, 307 u32 offset) 308 { 309 return -ENOENT; 310 } 311 312 static inline int netlbl_secattr_catmap_setbit( 313 struct netlbl_lsm_secattr_catmap *catmap, 314 u32 bit, 315 gfp_t flags) 316 { 317 return 0; 318 } 319 320 static inline int netlbl_secattr_catmap_setrng( 321 struct netlbl_lsm_secattr_catmap *catmap, 322 u32 start, 323 u32 end, 324 gfp_t flags) 325 { 326 return 0; 327 } 328 #endif 329 330 /* 331 * LSM protocol operations 332 */ 333 334 #ifdef CONFIG_NETLABEL 335 int netlbl_socket_setattr(const struct socket *sock, 336 const struct netlbl_lsm_secattr *secattr); 337 int netlbl_sock_getattr(struct sock *sk, 338 struct netlbl_lsm_secattr *secattr); 339 int netlbl_socket_getattr(const struct socket *sock, 340 struct netlbl_lsm_secattr *secattr); 341 int netlbl_skbuff_getattr(const struct sk_buff *skb, 342 struct netlbl_lsm_secattr *secattr); 343 void netlbl_skbuff_err(struct sk_buff *skb, int error); 344 #else 345 static inline int netlbl_socket_setattr(const struct socket *sock, 346 const struct netlbl_lsm_secattr *secattr) 347 { 348 return -ENOSYS; 349 } 350 351 static inline int netlbl_sock_getattr(struct sock *sk, 352 struct netlbl_lsm_secattr *secattr) 353 { 354 return -ENOSYS; 355 } 356 357 static inline int netlbl_socket_getattr(const struct socket *sock, 358 struct netlbl_lsm_secattr *secattr) 359 { 360 return -ENOSYS; 361 } 362 363 static inline int netlbl_skbuff_getattr(const struct sk_buff *skb, 364 struct netlbl_lsm_secattr *secattr) 365 { 366 return -ENOSYS; 367 } 368 369 static inline void netlbl_skbuff_err(struct sk_buff *skb, int error) 370 { 371 return; 372 } 373 #endif /* CONFIG_NETLABEL */ 374 375 /* 376 * LSM label mapping cache operations 377 */ 378 379 #ifdef CONFIG_NETLABEL 380 void netlbl_cache_invalidate(void); 381 int netlbl_cache_add(const struct sk_buff *skb, 382 const struct netlbl_lsm_secattr *secattr); 383 #else 384 static inline void netlbl_cache_invalidate(void) 385 { 386 return; 387 } 388 389 static inline int netlbl_cache_add(const struct sk_buff *skb, 390 const struct netlbl_lsm_secattr *secattr) 391 { 392 return 0; 393 } 394 #endif /* CONFIG_NETLABEL */ 395 396 #endif /* _NETLABEL_H */ 397