Paul Moore | 11a03f7 | 2006-08-03 16:46:20 -0700 | [diff] [blame] | 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> |
Paul Moore | 7a0e1d6 | 2006-08-29 17:56:04 -0700 | [diff] [blame] | 34 | #include <linux/net.h> |
Paul Moore | 11a03f7 | 2006-08-03 16:46:20 -0700 | [diff] [blame] | 35 | #include <linux/skbuff.h> |
| 36 | #include <net/netlink.h> |
paul.moore@hp.com | ffb733c | 2006-10-04 11:46:31 -0400 | [diff] [blame] | 37 | #include <asm/atomic.h> |
Paul Moore | 11a03f7 | 2006-08-03 16:46:20 -0700 | [diff] [blame] | 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 |
Paul Moore | fcd4828 | 2006-09-25 15:56:09 -0700 | [diff] [blame] | 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. |
Paul Moore | 11a03f7 | 2006-08-03 16:46:20 -0700 | [diff] [blame] | 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 | |
Paul Moore | 11a03f7 | 2006-08-03 16:46:20 -0700 | [diff] [blame] | 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 | |
Paul Moore | 95d4e6b | 2006-09-29 17:05:05 -0700 | [diff] [blame] | 96 | /* NetLabel audit information */ |
| 97 | struct netlbl_audit { |
| 98 | u32 secid; |
| 99 | uid_t loginuid; |
| 100 | }; |
| 101 | |
Paul Moore | 11a03f7 | 2006-08-03 16:46:20 -0700 | [diff] [blame] | 102 | /* Domain mapping definition struct */ |
| 103 | struct netlbl_dom_map; |
| 104 | |
| 105 | /* Domain mapping operations */ |
Paul Moore | 95d4e6b | 2006-09-29 17:05:05 -0700 | [diff] [blame] | 106 | int netlbl_domhsh_remove(const char *domain, struct netlbl_audit *audit_info); |
Paul Moore | 11a03f7 | 2006-08-03 16:46:20 -0700 | [diff] [blame] | 107 | |
| 108 | /* LSM security attributes */ |
| 109 | struct netlbl_lsm_cache { |
paul.moore@hp.com | ffb733c | 2006-10-04 11:46:31 -0400 | [diff] [blame] | 110 | atomic_t refcount; |
Paul Moore | 11a03f7 | 2006-08-03 16:46:20 -0700 | [diff] [blame] | 111 | void (*free) (const void *data); |
| 112 | void *data; |
| 113 | }; |
Paul Moore | 0275276 | 2006-11-29 13:18:18 -0500 | [diff] [blame^] | 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 | }; |
Paul Moore | 701a90b | 2006-11-17 17:38:46 -0500 | [diff] [blame] | 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 |
Paul Moore | 11a03f7 | 2006-08-03 16:46:20 -0700 | [diff] [blame] | 135 | struct netlbl_lsm_secattr { |
Paul Moore | 701a90b | 2006-11-17 17:38:46 -0500 | [diff] [blame] | 136 | u32 flags; |
| 137 | |
Paul Moore | 11a03f7 | 2006-08-03 16:46:20 -0700 | [diff] [blame] | 138 | char *domain; |
| 139 | |
| 140 | u32 mls_lvl; |
Paul Moore | 0275276 | 2006-11-29 13:18:18 -0500 | [diff] [blame^] | 141 | struct netlbl_lsm_secattr_catmap *mls_cat; |
Paul Moore | 11a03f7 | 2006-08-03 16:46:20 -0700 | [diff] [blame] | 142 | |
paul.moore@hp.com | ffb733c | 2006-10-04 11:46:31 -0400 | [diff] [blame] | 143 | struct netlbl_lsm_cache *cache; |
Paul Moore | 11a03f7 | 2006-08-03 16:46:20 -0700 | [diff] [blame] | 144 | }; |
| 145 | |
| 146 | /* |
| 147 | * LSM security attribute operations |
| 148 | */ |
| 149 | |
| 150 | |
| 151 | /** |
paul.moore@hp.com | ffb733c | 2006-10-04 11:46:31 -0400 | [diff] [blame] | 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 | */ |
Al Viro | 645408d | 2006-10-14 16:50:38 +0100 | [diff] [blame] | 160 | static inline struct netlbl_lsm_cache *netlbl_secattr_cache_alloc(gfp_t flags) |
paul.moore@hp.com | ffb733c | 2006-10-04 11:46:31 -0400 | [diff] [blame] | 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 | /** |
Paul Moore | 0275276 | 2006-11-29 13:18:18 -0500 | [diff] [blame^] | 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 | /** |
Paul Moore | 11a03f7 | 2006-08-03 16:46:20 -0700 | [diff] [blame] | 224 | * netlbl_secattr_init - Initialize a netlbl_lsm_secattr struct |
| 225 | * @secattr: the struct to initialize |
| 226 | * |
| 227 | * Description: |
Paul Moore | c6fa82a | 2006-11-17 17:38:45 -0500 | [diff] [blame] | 228 | * Initialize an already allocated netlbl_lsm_secattr struct. |
Paul Moore | 11a03f7 | 2006-08-03 16:46:20 -0700 | [diff] [blame] | 229 | * |
| 230 | */ |
Paul Moore | c6fa82a | 2006-11-17 17:38:45 -0500 | [diff] [blame] | 231 | static inline void netlbl_secattr_init(struct netlbl_lsm_secattr *secattr) |
Paul Moore | 11a03f7 | 2006-08-03 16:46:20 -0700 | [diff] [blame] | 232 | { |
Paul Moore | 701a90b | 2006-11-17 17:38:46 -0500 | [diff] [blame] | 233 | secattr->flags = 0; |
| 234 | secattr->domain = NULL; |
| 235 | secattr->mls_cat = NULL; |
| 236 | secattr->cache = NULL; |
Paul Moore | 11a03f7 | 2006-08-03 16:46:20 -0700 | [diff] [blame] | 237 | } |
| 238 | |
| 239 | /** |
| 240 | * netlbl_secattr_destroy - Clears a netlbl_lsm_secattr struct |
| 241 | * @secattr: the struct to clear |
Paul Moore | 11a03f7 | 2006-08-03 16:46:20 -0700 | [diff] [blame] | 242 | * |
| 243 | * Description: |
| 244 | * Destroys the @secattr struct, including freeing all of the internal buffers. |
paul.moore@hp.com | ffb733c | 2006-10-04 11:46:31 -0400 | [diff] [blame] | 245 | * The struct must be reset with a call to netlbl_secattr_init() before reuse. |
Paul Moore | 11a03f7 | 2006-08-03 16:46:20 -0700 | [diff] [blame] | 246 | * |
| 247 | */ |
paul.moore@hp.com | ffb733c | 2006-10-04 11:46:31 -0400 | [diff] [blame] | 248 | static inline void netlbl_secattr_destroy(struct netlbl_lsm_secattr *secattr) |
Paul Moore | 11a03f7 | 2006-08-03 16:46:20 -0700 | [diff] [blame] | 249 | { |
paul.moore@hp.com | ffb733c | 2006-10-04 11:46:31 -0400 | [diff] [blame] | 250 | if (secattr->cache) |
| 251 | netlbl_secattr_cache_free(secattr->cache); |
Paul Moore | 11a03f7 | 2006-08-03 16:46:20 -0700 | [diff] [blame] | 252 | kfree(secattr->domain); |
Paul Moore | 0275276 | 2006-11-29 13:18:18 -0500 | [diff] [blame^] | 253 | if (secattr->mls_cat) |
| 254 | netlbl_secattr_catmap_free(secattr->mls_cat); |
Paul Moore | 11a03f7 | 2006-08-03 16:46:20 -0700 | [diff] [blame] | 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 | */ |
Paul Moore | 1f758d9 | 2006-11-17 17:38:43 -0500 | [diff] [blame] | 266 | static inline struct netlbl_lsm_secattr *netlbl_secattr_alloc(gfp_t flags) |
Paul Moore | 11a03f7 | 2006-08-03 16:46:20 -0700 | [diff] [blame] | 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 |
Paul Moore | 11a03f7 | 2006-08-03 16:46:20 -0700 | [diff] [blame] | 274 | * |
| 275 | * Description: |
paul.moore@hp.com | ffb733c | 2006-10-04 11:46:31 -0400 | [diff] [blame] | 276 | * Frees @secattr including all of the internal buffers. |
Paul Moore | 11a03f7 | 2006-08-03 16:46:20 -0700 | [diff] [blame] | 277 | * |
| 278 | */ |
paul.moore@hp.com | ffb733c | 2006-10-04 11:46:31 -0400 | [diff] [blame] | 279 | static inline void netlbl_secattr_free(struct netlbl_lsm_secattr *secattr) |
Paul Moore | 11a03f7 | 2006-08-03 16:46:20 -0700 | [diff] [blame] | 280 | { |
paul.moore@hp.com | ffb733c | 2006-10-04 11:46:31 -0400 | [diff] [blame] | 281 | netlbl_secattr_destroy(secattr); |
Paul Moore | 11a03f7 | 2006-08-03 16:46:20 -0700 | [diff] [blame] | 282 | kfree(secattr); |
| 283 | } |
| 284 | |
Paul Moore | 0275276 | 2006-11-29 13:18:18 -0500 | [diff] [blame^] | 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 | |
Paul Moore | 11a03f7 | 2006-08-03 16:46:20 -0700 | [diff] [blame] | 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); |
Paul Moore | 14a72f5 | 2006-09-25 15:52:01 -0700 | [diff] [blame] | 337 | int netlbl_sock_getattr(struct sock *sk, |
| 338 | struct netlbl_lsm_secattr *secattr); |
Paul Moore | 11a03f7 | 2006-08-03 16:46:20 -0700 | [diff] [blame] | 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 | |
Paul Moore | 14a72f5 | 2006-09-25 15:52:01 -0700 | [diff] [blame] | 351 | static inline int netlbl_sock_getattr(struct sock *sk, |
| 352 | struct netlbl_lsm_secattr *secattr) |
| 353 | { |
| 354 | return -ENOSYS; |
| 355 | } |
| 356 | |
Paul Moore | 11a03f7 | 2006-08-03 16:46:20 -0700 | [diff] [blame] | 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 */ |