Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1 | /* |
| 2 | * CIPSO - Commercial IP Security Option |
| 3 | * |
| 4 | * This is an implementation of the CIPSO 2.2 protocol as specified in |
| 5 | * draft-ietf-cipso-ipsecurity-01.txt with additional tag types as found in |
Paul Moore | 586c250 | 2009-02-20 16:32:55 -0500 | [diff] [blame] | 6 | * FIPS-188. While CIPSO never became a full IETF RFC standard many vendors |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 7 | * have chosen to adopt the protocol and over the years it has become a |
| 8 | * de-facto standard for labeled networking. |
| 9 | * |
Paul Moore | 586c250 | 2009-02-20 16:32:55 -0500 | [diff] [blame] | 10 | * The CIPSO draft specification can be found in the kernel's Documentation |
| 11 | * directory as well as the following URL: |
Justin P. Mattock | 631dd1a | 2010-10-18 11:03:14 +0200 | [diff] [blame] | 12 | * http://tools.ietf.org/id/draft-ietf-cipso-ipsecurity-01.txt |
Paul Moore | 586c250 | 2009-02-20 16:32:55 -0500 | [diff] [blame] | 13 | * The FIPS-188 specification can be found at the following URL: |
| 14 | * http://www.itl.nist.gov/fipspubs/fip188.htm |
| 15 | * |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 16 | * Author: Paul Moore <paul.moore@hp.com> |
| 17 | * |
| 18 | */ |
| 19 | |
| 20 | /* |
Paul Moore | 948bf85 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 21 | * (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008 |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 22 | * |
| 23 | * This program is free software; you can redistribute it and/or modify |
| 24 | * it under the terms of the GNU General Public License as published by |
| 25 | * the Free Software Foundation; either version 2 of the License, or |
| 26 | * (at your option) any later version. |
| 27 | * |
| 28 | * This program is distributed in the hope that it will be useful, |
| 29 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 30 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
| 31 | * the GNU General Public License for more details. |
| 32 | * |
| 33 | * You should have received a copy of the GNU General Public License |
Jeff Kirsher | a99421d | 2013-12-06 09:13:39 -0800 | [diff] [blame] | 34 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 35 | * |
| 36 | */ |
| 37 | |
| 38 | #include <linux/init.h> |
| 39 | #include <linux/types.h> |
| 40 | #include <linux/rcupdate.h> |
| 41 | #include <linux/list.h> |
| 42 | #include <linux/spinlock.h> |
| 43 | #include <linux/string.h> |
| 44 | #include <linux/jhash.h> |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 45 | #include <linux/audit.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 46 | #include <linux/slab.h> |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 47 | #include <net/ip.h> |
| 48 | #include <net/icmp.h> |
| 49 | #include <net/tcp.h> |
| 50 | #include <net/netlabel.h> |
| 51 | #include <net/cipso_ipv4.h> |
Arun Sharma | 60063497 | 2011-07-26 16:09:06 -0700 | [diff] [blame] | 52 | #include <linux/atomic.h> |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 53 | #include <asm/bug.h> |
Paul Moore | 50e5d35 | 2007-06-07 18:38:14 -0700 | [diff] [blame] | 54 | #include <asm/unaligned.h> |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 55 | |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 56 | /* List of available DOI definitions */ |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 57 | /* XXX - This currently assumes a minimal number of different DOIs in use, |
| 58 | * if in practice there are a lot of different DOIs this list should |
| 59 | * probably be turned into a hash table or something similar so we |
| 60 | * can do quick lookups. */ |
Adrian Bunk | 8ce11e6 | 2006-08-07 21:50:48 -0700 | [diff] [blame] | 61 | static DEFINE_SPINLOCK(cipso_v4_doi_list_lock); |
Denis Cheng | 1596c97 | 2007-12-07 00:49:47 -0800 | [diff] [blame] | 62 | static LIST_HEAD(cipso_v4_doi_list); |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 63 | |
| 64 | /* Label mapping cache */ |
| 65 | int cipso_v4_cache_enabled = 1; |
| 66 | int cipso_v4_cache_bucketsize = 10; |
| 67 | #define CIPSO_V4_CACHE_BUCKETBITS 7 |
| 68 | #define CIPSO_V4_CACHE_BUCKETS (1 << CIPSO_V4_CACHE_BUCKETBITS) |
| 69 | #define CIPSO_V4_CACHE_REORDERLIMIT 10 |
| 70 | struct cipso_v4_map_cache_bkt { |
| 71 | spinlock_t lock; |
| 72 | u32 size; |
| 73 | struct list_head list; |
| 74 | }; |
| 75 | struct cipso_v4_map_cache_entry { |
| 76 | u32 hash; |
| 77 | unsigned char *key; |
| 78 | size_t key_len; |
| 79 | |
paul.moore@hp.com | ffb733c | 2006-10-04 11:46:31 -0400 | [diff] [blame] | 80 | struct netlbl_lsm_cache *lsm_data; |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 81 | |
| 82 | u32 activity; |
| 83 | struct list_head list; |
| 84 | }; |
| 85 | static struct cipso_v4_map_cache_bkt *cipso_v4_cache = NULL; |
| 86 | |
| 87 | /* Restricted bitmap (tag #1) flags */ |
| 88 | int cipso_v4_rbm_optfmt = 0; |
| 89 | int cipso_v4_rbm_strictvalid = 1; |
| 90 | |
| 91 | /* |
Paul Moore | f998e8c | 2007-02-28 15:14:20 -0500 | [diff] [blame] | 92 | * Protocol Constants |
| 93 | */ |
| 94 | |
| 95 | /* Maximum size of the CIPSO IP option, derived from the fact that the maximum |
| 96 | * IPv4 header size is 60 bytes and the base IPv4 header is 20 bytes long. */ |
| 97 | #define CIPSO_V4_OPT_LEN_MAX 40 |
| 98 | |
| 99 | /* Length of the base CIPSO option, this includes the option type (1 byte), the |
| 100 | * option length (1 byte), and the DOI (4 bytes). */ |
| 101 | #define CIPSO_V4_HDR_LEN 6 |
| 102 | |
| 103 | /* Base length of the restrictive category bitmap tag (tag #1). */ |
| 104 | #define CIPSO_V4_TAG_RBM_BLEN 4 |
| 105 | |
| 106 | /* Base length of the enumerated category tag (tag #2). */ |
| 107 | #define CIPSO_V4_TAG_ENUM_BLEN 4 |
| 108 | |
| 109 | /* Base length of the ranged categories bitmap tag (tag #5). */ |
| 110 | #define CIPSO_V4_TAG_RNG_BLEN 4 |
| 111 | /* The maximum number of category ranges permitted in the ranged category tag |
| 112 | * (tag #5). You may note that the IETF draft states that the maximum number |
| 113 | * of category ranges is 7, but if the low end of the last category range is |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 114 | * zero then it is possible to fit 8 category ranges because the zero should |
Paul Moore | f998e8c | 2007-02-28 15:14:20 -0500 | [diff] [blame] | 115 | * be omitted. */ |
| 116 | #define CIPSO_V4_TAG_RNG_CAT_MAX 8 |
| 117 | |
Paul Moore | 15c45f7 | 2008-10-10 10:16:34 -0400 | [diff] [blame] | 118 | /* Base length of the local tag (non-standard tag). |
| 119 | * Tag definition (may change between kernel versions) |
| 120 | * |
| 121 | * 0 8 16 24 32 |
| 122 | * +----------+----------+----------+----------+ |
| 123 | * | 10000000 | 00000110 | 32-bit secid value | |
| 124 | * +----------+----------+----------+----------+ |
| 125 | * | in (host byte order)| |
| 126 | * +----------+----------+ |
| 127 | * |
| 128 | */ |
| 129 | #define CIPSO_V4_TAG_LOC_BLEN 6 |
| 130 | |
Paul Moore | f998e8c | 2007-02-28 15:14:20 -0500 | [diff] [blame] | 131 | /* |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 132 | * Helper Functions |
| 133 | */ |
| 134 | |
| 135 | /** |
| 136 | * cipso_v4_bitmap_walk - Walk a bitmap looking for a bit |
| 137 | * @bitmap: the bitmap |
| 138 | * @bitmap_len: length in bits |
| 139 | * @offset: starting offset |
| 140 | * @state: if non-zero, look for a set (1) bit else look for a cleared (0) bit |
| 141 | * |
| 142 | * Description: |
| 143 | * Starting at @offset, walk the bitmap from left to right until either the |
| 144 | * desired bit is found or we reach the end. Return the bit offset, -1 if |
| 145 | * not found, or -2 if error. |
| 146 | */ |
| 147 | static int cipso_v4_bitmap_walk(const unsigned char *bitmap, |
| 148 | u32 bitmap_len, |
| 149 | u32 offset, |
| 150 | u8 state) |
| 151 | { |
| 152 | u32 bit_spot; |
| 153 | u32 byte_offset; |
| 154 | unsigned char bitmask; |
| 155 | unsigned char byte; |
| 156 | |
| 157 | /* gcc always rounds to zero when doing integer division */ |
| 158 | byte_offset = offset / 8; |
| 159 | byte = bitmap[byte_offset]; |
| 160 | bit_spot = offset; |
| 161 | bitmask = 0x80 >> (offset % 8); |
| 162 | |
| 163 | while (bit_spot < bitmap_len) { |
| 164 | if ((state && (byte & bitmask) == bitmask) || |
| 165 | (state == 0 && (byte & bitmask) == 0)) |
| 166 | return bit_spot; |
| 167 | |
| 168 | bit_spot++; |
| 169 | bitmask >>= 1; |
| 170 | if (bitmask == 0) { |
| 171 | byte = bitmap[++byte_offset]; |
| 172 | bitmask = 0x80; |
| 173 | } |
| 174 | } |
| 175 | |
| 176 | return -1; |
| 177 | } |
| 178 | |
| 179 | /** |
| 180 | * cipso_v4_bitmap_setbit - Sets a single bit in a bitmap |
| 181 | * @bitmap: the bitmap |
| 182 | * @bit: the bit |
| 183 | * @state: if non-zero, set the bit (1) else clear the bit (0) |
| 184 | * |
| 185 | * Description: |
| 186 | * Set a single bit in the bitmask. Returns zero on success, negative values |
| 187 | * on error. |
| 188 | */ |
| 189 | static void cipso_v4_bitmap_setbit(unsigned char *bitmap, |
| 190 | u32 bit, |
| 191 | u8 state) |
| 192 | { |
| 193 | u32 byte_spot; |
| 194 | u8 bitmask; |
| 195 | |
| 196 | /* gcc always rounds to zero when doing integer division */ |
| 197 | byte_spot = bit / 8; |
| 198 | bitmask = 0x80 >> (bit % 8); |
| 199 | if (state) |
| 200 | bitmap[byte_spot] |= bitmask; |
| 201 | else |
| 202 | bitmap[byte_spot] &= ~bitmask; |
| 203 | } |
| 204 | |
| 205 | /** |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 206 | * cipso_v4_cache_entry_free - Frees a cache entry |
| 207 | * @entry: the entry to free |
| 208 | * |
| 209 | * Description: |
paul.moore@hp.com | ffb733c | 2006-10-04 11:46:31 -0400 | [diff] [blame] | 210 | * This function frees the memory associated with a cache entry including the |
| 211 | * LSM cache data if there are no longer any users, i.e. reference count == 0. |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 212 | * |
| 213 | */ |
| 214 | static void cipso_v4_cache_entry_free(struct cipso_v4_map_cache_entry *entry) |
| 215 | { |
paul.moore@hp.com | ffb733c | 2006-10-04 11:46:31 -0400 | [diff] [blame] | 216 | if (entry->lsm_data) |
| 217 | netlbl_secattr_cache_free(entry->lsm_data); |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 218 | kfree(entry->key); |
| 219 | kfree(entry); |
| 220 | } |
| 221 | |
| 222 | /** |
| 223 | * cipso_v4_map_cache_hash - Hashing function for the CIPSO cache |
| 224 | * @key: the hash key |
| 225 | * @key_len: the length of the key in bytes |
| 226 | * |
| 227 | * Description: |
| 228 | * The CIPSO tag hashing function. Returns a 32-bit hash value. |
| 229 | * |
| 230 | */ |
| 231 | static u32 cipso_v4_map_cache_hash(const unsigned char *key, u32 key_len) |
| 232 | { |
| 233 | return jhash(key, key_len, 0); |
| 234 | } |
| 235 | |
| 236 | /* |
| 237 | * Label Mapping Cache Functions |
| 238 | */ |
| 239 | |
| 240 | /** |
| 241 | * cipso_v4_cache_init - Initialize the CIPSO cache |
| 242 | * |
| 243 | * Description: |
| 244 | * Initializes the CIPSO label mapping cache, this function should be called |
| 245 | * before any of the other functions defined in this file. Returns zero on |
| 246 | * success, negative values on error. |
| 247 | * |
| 248 | */ |
| 249 | static int cipso_v4_cache_init(void) |
| 250 | { |
| 251 | u32 iter; |
| 252 | |
| 253 | cipso_v4_cache = kcalloc(CIPSO_V4_CACHE_BUCKETS, |
| 254 | sizeof(struct cipso_v4_map_cache_bkt), |
| 255 | GFP_KERNEL); |
| 256 | if (cipso_v4_cache == NULL) |
| 257 | return -ENOMEM; |
| 258 | |
| 259 | for (iter = 0; iter < CIPSO_V4_CACHE_BUCKETS; iter++) { |
| 260 | spin_lock_init(&cipso_v4_cache[iter].lock); |
| 261 | cipso_v4_cache[iter].size = 0; |
| 262 | INIT_LIST_HEAD(&cipso_v4_cache[iter].list); |
| 263 | } |
| 264 | |
| 265 | return 0; |
| 266 | } |
| 267 | |
| 268 | /** |
| 269 | * cipso_v4_cache_invalidate - Invalidates the current CIPSO cache |
| 270 | * |
| 271 | * Description: |
| 272 | * Invalidates and frees any entries in the CIPSO cache. Returns zero on |
| 273 | * success and negative values on failure. |
| 274 | * |
| 275 | */ |
| 276 | void cipso_v4_cache_invalidate(void) |
| 277 | { |
| 278 | struct cipso_v4_map_cache_entry *entry, *tmp_entry; |
| 279 | u32 iter; |
| 280 | |
| 281 | for (iter = 0; iter < CIPSO_V4_CACHE_BUCKETS; iter++) { |
Paul Moore | 609c92f | 2006-09-25 15:52:37 -0700 | [diff] [blame] | 282 | spin_lock_bh(&cipso_v4_cache[iter].lock); |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 283 | list_for_each_entry_safe(entry, |
| 284 | tmp_entry, |
| 285 | &cipso_v4_cache[iter].list, list) { |
| 286 | list_del(&entry->list); |
| 287 | cipso_v4_cache_entry_free(entry); |
| 288 | } |
| 289 | cipso_v4_cache[iter].size = 0; |
Paul Moore | 609c92f | 2006-09-25 15:52:37 -0700 | [diff] [blame] | 290 | spin_unlock_bh(&cipso_v4_cache[iter].lock); |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 291 | } |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 292 | } |
| 293 | |
| 294 | /** |
| 295 | * cipso_v4_cache_check - Check the CIPSO cache for a label mapping |
| 296 | * @key: the buffer to check |
| 297 | * @key_len: buffer length in bytes |
| 298 | * @secattr: the security attribute struct to use |
| 299 | * |
| 300 | * Description: |
| 301 | * This function checks the cache to see if a label mapping already exists for |
| 302 | * the given key. If there is a match then the cache is adjusted and the |
| 303 | * @secattr struct is populated with the correct LSM security attributes. The |
| 304 | * cache is adjusted in the following manner if the entry is not already the |
| 305 | * first in the cache bucket: |
| 306 | * |
| 307 | * 1. The cache entry's activity counter is incremented |
| 308 | * 2. The previous (higher ranking) entry's activity counter is decremented |
| 309 | * 3. If the difference between the two activity counters is geater than |
| 310 | * CIPSO_V4_CACHE_REORDERLIMIT the two entries are swapped |
| 311 | * |
| 312 | * Returns zero on success, -ENOENT for a cache miss, and other negative values |
| 313 | * on error. |
| 314 | * |
| 315 | */ |
| 316 | static int cipso_v4_cache_check(const unsigned char *key, |
| 317 | u32 key_len, |
| 318 | struct netlbl_lsm_secattr *secattr) |
| 319 | { |
| 320 | u32 bkt; |
| 321 | struct cipso_v4_map_cache_entry *entry; |
| 322 | struct cipso_v4_map_cache_entry *prev_entry = NULL; |
| 323 | u32 hash; |
| 324 | |
| 325 | if (!cipso_v4_cache_enabled) |
| 326 | return -ENOENT; |
| 327 | |
| 328 | hash = cipso_v4_map_cache_hash(key, key_len); |
Pavel Emelyanov | 5e0f892 | 2008-05-13 23:23:55 -0700 | [diff] [blame] | 329 | bkt = hash & (CIPSO_V4_CACHE_BUCKETS - 1); |
Paul Moore | 609c92f | 2006-09-25 15:52:37 -0700 | [diff] [blame] | 330 | spin_lock_bh(&cipso_v4_cache[bkt].lock); |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 331 | list_for_each_entry(entry, &cipso_v4_cache[bkt].list, list) { |
| 332 | if (entry->hash == hash && |
| 333 | entry->key_len == key_len && |
| 334 | memcmp(entry->key, key, key_len) == 0) { |
| 335 | entry->activity += 1; |
paul.moore@hp.com | ffb733c | 2006-10-04 11:46:31 -0400 | [diff] [blame] | 336 | atomic_inc(&entry->lsm_data->refcount); |
| 337 | secattr->cache = entry->lsm_data; |
Paul Moore | 701a90b | 2006-11-17 17:38:46 -0500 | [diff] [blame] | 338 | secattr->flags |= NETLBL_SECATTR_CACHE; |
Paul Moore | 16efd45 | 2008-01-29 08:37:59 -0500 | [diff] [blame] | 339 | secattr->type = NETLBL_NLTYPE_CIPSOV4; |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 340 | if (prev_entry == NULL) { |
Paul Moore | 609c92f | 2006-09-25 15:52:37 -0700 | [diff] [blame] | 341 | spin_unlock_bh(&cipso_v4_cache[bkt].lock); |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 342 | return 0; |
| 343 | } |
| 344 | |
| 345 | if (prev_entry->activity > 0) |
| 346 | prev_entry->activity -= 1; |
| 347 | if (entry->activity > prev_entry->activity && |
| 348 | entry->activity - prev_entry->activity > |
| 349 | CIPSO_V4_CACHE_REORDERLIMIT) { |
| 350 | __list_del(entry->list.prev, entry->list.next); |
| 351 | __list_add(&entry->list, |
| 352 | prev_entry->list.prev, |
| 353 | &prev_entry->list); |
| 354 | } |
| 355 | |
Paul Moore | 609c92f | 2006-09-25 15:52:37 -0700 | [diff] [blame] | 356 | spin_unlock_bh(&cipso_v4_cache[bkt].lock); |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 357 | return 0; |
| 358 | } |
| 359 | prev_entry = entry; |
| 360 | } |
Paul Moore | 609c92f | 2006-09-25 15:52:37 -0700 | [diff] [blame] | 361 | spin_unlock_bh(&cipso_v4_cache[bkt].lock); |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 362 | |
| 363 | return -ENOENT; |
| 364 | } |
| 365 | |
| 366 | /** |
| 367 | * cipso_v4_cache_add - Add an entry to the CIPSO cache |
| 368 | * @skb: the packet |
| 369 | * @secattr: the packet's security attributes |
| 370 | * |
| 371 | * Description: |
| 372 | * Add a new entry into the CIPSO label mapping cache. Add the new entry to |
| 373 | * head of the cache bucket's list, if the cache bucket is out of room remove |
| 374 | * the last entry in the list first. It is important to note that there is |
| 375 | * currently no checking for duplicate keys. Returns zero on success, |
| 376 | * negative values on failure. |
| 377 | * |
| 378 | */ |
| 379 | int cipso_v4_cache_add(const struct sk_buff *skb, |
| 380 | const struct netlbl_lsm_secattr *secattr) |
| 381 | { |
| 382 | int ret_val = -EPERM; |
| 383 | u32 bkt; |
| 384 | struct cipso_v4_map_cache_entry *entry = NULL; |
| 385 | struct cipso_v4_map_cache_entry *old_entry = NULL; |
| 386 | unsigned char *cipso_ptr; |
| 387 | u32 cipso_ptr_len; |
| 388 | |
| 389 | if (!cipso_v4_cache_enabled || cipso_v4_cache_bucketsize <= 0) |
| 390 | return 0; |
| 391 | |
| 392 | cipso_ptr = CIPSO_V4_OPTPTR(skb); |
| 393 | cipso_ptr_len = cipso_ptr[1]; |
| 394 | |
| 395 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); |
| 396 | if (entry == NULL) |
| 397 | return -ENOMEM; |
Arnaldo Carvalho de Melo | fac5d73 | 2006-11-17 11:14:16 -0200 | [diff] [blame] | 398 | entry->key = kmemdup(cipso_ptr, cipso_ptr_len, GFP_ATOMIC); |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 399 | if (entry->key == NULL) { |
| 400 | ret_val = -ENOMEM; |
| 401 | goto cache_add_failure; |
| 402 | } |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 403 | entry->key_len = cipso_ptr_len; |
| 404 | entry->hash = cipso_v4_map_cache_hash(cipso_ptr, cipso_ptr_len); |
paul.moore@hp.com | ffb733c | 2006-10-04 11:46:31 -0400 | [diff] [blame] | 405 | atomic_inc(&secattr->cache->refcount); |
| 406 | entry->lsm_data = secattr->cache; |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 407 | |
Pavel Emelyanov | 5e0f892 | 2008-05-13 23:23:55 -0700 | [diff] [blame] | 408 | bkt = entry->hash & (CIPSO_V4_CACHE_BUCKETS - 1); |
Paul Moore | 609c92f | 2006-09-25 15:52:37 -0700 | [diff] [blame] | 409 | spin_lock_bh(&cipso_v4_cache[bkt].lock); |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 410 | if (cipso_v4_cache[bkt].size < cipso_v4_cache_bucketsize) { |
| 411 | list_add(&entry->list, &cipso_v4_cache[bkt].list); |
| 412 | cipso_v4_cache[bkt].size += 1; |
| 413 | } else { |
| 414 | old_entry = list_entry(cipso_v4_cache[bkt].list.prev, |
| 415 | struct cipso_v4_map_cache_entry, list); |
| 416 | list_del(&old_entry->list); |
| 417 | list_add(&entry->list, &cipso_v4_cache[bkt].list); |
| 418 | cipso_v4_cache_entry_free(old_entry); |
| 419 | } |
Paul Moore | 609c92f | 2006-09-25 15:52:37 -0700 | [diff] [blame] | 420 | spin_unlock_bh(&cipso_v4_cache[bkt].lock); |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 421 | |
| 422 | return 0; |
| 423 | |
| 424 | cache_add_failure: |
| 425 | if (entry) |
| 426 | cipso_v4_cache_entry_free(entry); |
| 427 | return ret_val; |
| 428 | } |
| 429 | |
| 430 | /* |
| 431 | * DOI List Functions |
| 432 | */ |
| 433 | |
| 434 | /** |
| 435 | * cipso_v4_doi_search - Searches for a DOI definition |
| 436 | * @doi: the DOI to search for |
| 437 | * |
| 438 | * Description: |
| 439 | * Search the DOI definition list for a DOI definition with a DOI value that |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 440 | * matches @doi. The caller is responsible for calling rcu_read_[un]lock(). |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 441 | * Returns a pointer to the DOI definition on success and NULL on failure. |
| 442 | */ |
| 443 | static struct cipso_v4_doi *cipso_v4_doi_search(u32 doi) |
| 444 | { |
| 445 | struct cipso_v4_doi *iter; |
| 446 | |
| 447 | list_for_each_entry_rcu(iter, &cipso_v4_doi_list, list) |
Paul Moore | b1edeb1 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 448 | if (iter->doi == doi && atomic_read(&iter->refcount)) |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 449 | return iter; |
| 450 | return NULL; |
| 451 | } |
| 452 | |
| 453 | /** |
| 454 | * cipso_v4_doi_add - Add a new DOI to the CIPSO protocol engine |
| 455 | * @doi_def: the DOI structure |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 456 | * @audit_info: NetLabel audit information |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 457 | * |
| 458 | * Description: |
| 459 | * The caller defines a new DOI for use by the CIPSO engine and calls this |
| 460 | * function to add it to the list of acceptable domains. The caller must |
| 461 | * ensure that the mapping table specified in @doi_def->map meets all of the |
| 462 | * requirements of the mapping type (see cipso_ipv4.h for details). Returns |
| 463 | * zero on success and non-zero on failure. |
| 464 | * |
| 465 | */ |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 466 | int cipso_v4_doi_add(struct cipso_v4_doi *doi_def, |
| 467 | struct netlbl_audit *audit_info) |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 468 | { |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 469 | int ret_val = -EINVAL; |
Paul Moore | 6ce61a7 | 2006-11-17 17:38:48 -0500 | [diff] [blame] | 470 | u32 iter; |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 471 | u32 doi; |
| 472 | u32 doi_type; |
| 473 | struct audit_buffer *audit_buf; |
| 474 | |
| 475 | doi = doi_def->doi; |
| 476 | doi_type = doi_def->type; |
Paul Moore | 6ce61a7 | 2006-11-17 17:38:48 -0500 | [diff] [blame] | 477 | |
Dan Carpenter | 5675592 | 2011-10-11 18:43:53 -0400 | [diff] [blame] | 478 | if (doi_def->doi == CIPSO_V4_DOI_UNKNOWN) |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 479 | goto doi_add_return; |
Paul Moore | 6ce61a7 | 2006-11-17 17:38:48 -0500 | [diff] [blame] | 480 | for (iter = 0; iter < CIPSO_V4_TAG_MAXCNT; iter++) { |
| 481 | switch (doi_def->tags[iter]) { |
| 482 | case CIPSO_V4_TAG_RBITMAP: |
| 483 | break; |
Paul Moore | 484b366 | 2006-11-29 13:18:20 -0500 | [diff] [blame] | 484 | case CIPSO_V4_TAG_RANGE: |
Paul Moore | 654bbc2 | 2006-11-29 13:18:19 -0500 | [diff] [blame] | 485 | case CIPSO_V4_TAG_ENUM: |
| 486 | if (doi_def->type != CIPSO_V4_MAP_PASS) |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 487 | goto doi_add_return; |
Paul Moore | 654bbc2 | 2006-11-29 13:18:19 -0500 | [diff] [blame] | 488 | break; |
Paul Moore | 15c45f7 | 2008-10-10 10:16:34 -0400 | [diff] [blame] | 489 | case CIPSO_V4_TAG_LOCAL: |
| 490 | if (doi_def->type != CIPSO_V4_MAP_LOCAL) |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 491 | goto doi_add_return; |
| 492 | break; |
| 493 | case CIPSO_V4_TAG_INVALID: |
| 494 | if (iter == 0) |
| 495 | goto doi_add_return; |
Paul Moore | 15c45f7 | 2008-10-10 10:16:34 -0400 | [diff] [blame] | 496 | break; |
Paul Moore | 6ce61a7 | 2006-11-17 17:38:48 -0500 | [diff] [blame] | 497 | default: |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 498 | goto doi_add_return; |
Paul Moore | 6ce61a7 | 2006-11-17 17:38:48 -0500 | [diff] [blame] | 499 | } |
| 500 | } |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 501 | |
Paul Moore | b1edeb1 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 502 | atomic_set(&doi_def->refcount, 1); |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 503 | |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 504 | spin_lock(&cipso_v4_doi_list_lock); |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 505 | if (cipso_v4_doi_search(doi_def->doi) != NULL) { |
| 506 | spin_unlock(&cipso_v4_doi_list_lock); |
| 507 | ret_val = -EEXIST; |
| 508 | goto doi_add_return; |
| 509 | } |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 510 | list_add_tail_rcu(&doi_def->list, &cipso_v4_doi_list); |
| 511 | spin_unlock(&cipso_v4_doi_list_lock); |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 512 | ret_val = 0; |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 513 | |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 514 | doi_add_return: |
| 515 | audit_buf = netlbl_audit_start(AUDIT_MAC_CIPSOV4_ADD, audit_info); |
| 516 | if (audit_buf != NULL) { |
| 517 | const char *type_str; |
| 518 | switch (doi_type) { |
| 519 | case CIPSO_V4_MAP_TRANS: |
| 520 | type_str = "trans"; |
| 521 | break; |
| 522 | case CIPSO_V4_MAP_PASS: |
| 523 | type_str = "pass"; |
| 524 | break; |
| 525 | case CIPSO_V4_MAP_LOCAL: |
| 526 | type_str = "local"; |
| 527 | break; |
| 528 | default: |
| 529 | type_str = "(unknown)"; |
| 530 | } |
| 531 | audit_log_format(audit_buf, |
| 532 | " cipso_doi=%u cipso_type=%s res=%u", |
| 533 | doi, type_str, ret_val == 0 ? 1 : 0); |
| 534 | audit_log_end(audit_buf); |
| 535 | } |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 536 | |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 537 | return ret_val; |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 538 | } |
| 539 | |
| 540 | /** |
Paul Moore | b1edeb1 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 541 | * cipso_v4_doi_free - Frees a DOI definition |
| 542 | * @entry: the entry's RCU field |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 543 | * |
| 544 | * Description: |
Paul Moore | b1edeb1 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 545 | * This function frees all of the memory associated with a DOI definition. |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 546 | * |
| 547 | */ |
Paul Moore | b1edeb1 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 548 | void cipso_v4_doi_free(struct cipso_v4_doi *doi_def) |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 549 | { |
Paul Moore | b1edeb1 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 550 | if (doi_def == NULL) |
| 551 | return; |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 552 | |
Paul Moore | b1edeb1 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 553 | switch (doi_def->type) { |
Paul Moore | 15c45f7 | 2008-10-10 10:16:34 -0400 | [diff] [blame] | 554 | case CIPSO_V4_MAP_TRANS: |
Paul Moore | b1edeb1 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 555 | kfree(doi_def->map.std->lvl.cipso); |
| 556 | kfree(doi_def->map.std->lvl.local); |
| 557 | kfree(doi_def->map.std->cat.cipso); |
| 558 | kfree(doi_def->map.std->cat.local); |
| 559 | break; |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 560 | } |
Paul Moore | b1edeb1 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 561 | kfree(doi_def); |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 562 | } |
| 563 | |
| 564 | /** |
Paul Moore | b1edeb1 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 565 | * cipso_v4_doi_free_rcu - Frees a DOI definition via the RCU pointer |
| 566 | * @entry: the entry's RCU field |
| 567 | * |
| 568 | * Description: |
| 569 | * This function is designed to be used as a callback to the call_rcu() |
| 570 | * function so that the memory allocated to the DOI definition can be released |
| 571 | * safely. |
| 572 | * |
| 573 | */ |
| 574 | static void cipso_v4_doi_free_rcu(struct rcu_head *entry) |
| 575 | { |
| 576 | struct cipso_v4_doi *doi_def; |
| 577 | |
| 578 | doi_def = container_of(entry, struct cipso_v4_doi, rcu); |
| 579 | cipso_v4_doi_free(doi_def); |
| 580 | } |
| 581 | |
| 582 | /** |
| 583 | * cipso_v4_doi_remove - Remove an existing DOI from the CIPSO protocol engine |
| 584 | * @doi: the DOI value |
| 585 | * @audit_secid: the LSM secid to use in the audit message |
| 586 | * |
| 587 | * Description: |
| 588 | * Removes a DOI definition from the CIPSO engine. The NetLabel routines will |
| 589 | * be called to release their own LSM domain mappings as well as our own |
| 590 | * domain list. Returns zero on success and negative values on failure. |
| 591 | * |
| 592 | */ |
| 593 | int cipso_v4_doi_remove(u32 doi, struct netlbl_audit *audit_info) |
| 594 | { |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 595 | int ret_val; |
Paul Moore | b1edeb1 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 596 | struct cipso_v4_doi *doi_def; |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 597 | struct audit_buffer *audit_buf; |
Paul Moore | b1edeb1 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 598 | |
| 599 | spin_lock(&cipso_v4_doi_list_lock); |
| 600 | doi_def = cipso_v4_doi_search(doi); |
| 601 | if (doi_def == NULL) { |
| 602 | spin_unlock(&cipso_v4_doi_list_lock); |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 603 | ret_val = -ENOENT; |
| 604 | goto doi_remove_return; |
Paul Moore | b1edeb1 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 605 | } |
| 606 | if (!atomic_dec_and_test(&doi_def->refcount)) { |
| 607 | spin_unlock(&cipso_v4_doi_list_lock); |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 608 | ret_val = -EBUSY; |
| 609 | goto doi_remove_return; |
Paul Moore | b1edeb1 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 610 | } |
| 611 | list_del_rcu(&doi_def->list); |
| 612 | spin_unlock(&cipso_v4_doi_list_lock); |
| 613 | |
| 614 | cipso_v4_cache_invalidate(); |
| 615 | call_rcu(&doi_def->rcu, cipso_v4_doi_free_rcu); |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 616 | ret_val = 0; |
Paul Moore | b1edeb1 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 617 | |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 618 | doi_remove_return: |
| 619 | audit_buf = netlbl_audit_start(AUDIT_MAC_CIPSOV4_DEL, audit_info); |
| 620 | if (audit_buf != NULL) { |
| 621 | audit_log_format(audit_buf, |
| 622 | " cipso_doi=%u res=%u", |
| 623 | doi, ret_val == 0 ? 1 : 0); |
| 624 | audit_log_end(audit_buf); |
| 625 | } |
| 626 | |
| 627 | return ret_val; |
Paul Moore | b1edeb1 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 628 | } |
| 629 | |
| 630 | /** |
| 631 | * cipso_v4_doi_getdef - Returns a reference to a valid DOI definition |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 632 | * @doi: the DOI value |
| 633 | * |
| 634 | * Description: |
| 635 | * Searches for a valid DOI definition and if one is found it is returned to |
| 636 | * the caller. Otherwise NULL is returned. The caller must ensure that |
Paul Moore | b1edeb1 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 637 | * rcu_read_lock() is held while accessing the returned definition and the DOI |
| 638 | * definition reference count is decremented when the caller is done. |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 639 | * |
| 640 | */ |
| 641 | struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi) |
| 642 | { |
Paul Moore | b1edeb1 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 643 | struct cipso_v4_doi *doi_def; |
| 644 | |
| 645 | rcu_read_lock(); |
| 646 | doi_def = cipso_v4_doi_search(doi); |
| 647 | if (doi_def == NULL) |
| 648 | goto doi_getdef_return; |
| 649 | if (!atomic_inc_not_zero(&doi_def->refcount)) |
| 650 | doi_def = NULL; |
| 651 | |
| 652 | doi_getdef_return: |
| 653 | rcu_read_unlock(); |
| 654 | return doi_def; |
| 655 | } |
| 656 | |
| 657 | /** |
| 658 | * cipso_v4_doi_putdef - Releases a reference for the given DOI definition |
| 659 | * @doi_def: the DOI definition |
| 660 | * |
| 661 | * Description: |
| 662 | * Releases a DOI definition reference obtained from cipso_v4_doi_getdef(). |
| 663 | * |
| 664 | */ |
| 665 | void cipso_v4_doi_putdef(struct cipso_v4_doi *doi_def) |
| 666 | { |
| 667 | if (doi_def == NULL) |
| 668 | return; |
| 669 | |
| 670 | if (!atomic_dec_and_test(&doi_def->refcount)) |
| 671 | return; |
| 672 | spin_lock(&cipso_v4_doi_list_lock); |
| 673 | list_del_rcu(&doi_def->list); |
| 674 | spin_unlock(&cipso_v4_doi_list_lock); |
| 675 | |
| 676 | cipso_v4_cache_invalidate(); |
| 677 | call_rcu(&doi_def->rcu, cipso_v4_doi_free_rcu); |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 678 | } |
| 679 | |
| 680 | /** |
Paul Moore | fcd4828 | 2006-09-25 15:56:09 -0700 | [diff] [blame] | 681 | * cipso_v4_doi_walk - Iterate through the DOI definitions |
| 682 | * @skip_cnt: skip past this number of DOI definitions, updated |
| 683 | * @callback: callback for each DOI definition |
| 684 | * @cb_arg: argument for the callback function |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 685 | * |
| 686 | * Description: |
Paul Moore | fcd4828 | 2006-09-25 15:56:09 -0700 | [diff] [blame] | 687 | * Iterate over the DOI definition list, skipping the first @skip_cnt entries. |
| 688 | * For each entry call @callback, if @callback returns a negative value stop |
| 689 | * 'walking' through the list and return. Updates the value in @skip_cnt upon |
| 690 | * return. Returns zero on success, negative values on failure. |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 691 | * |
| 692 | */ |
Paul Moore | fcd4828 | 2006-09-25 15:56:09 -0700 | [diff] [blame] | 693 | int cipso_v4_doi_walk(u32 *skip_cnt, |
| 694 | int (*callback) (struct cipso_v4_doi *doi_def, void *arg), |
| 695 | void *cb_arg) |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 696 | { |
Paul Moore | fcd4828 | 2006-09-25 15:56:09 -0700 | [diff] [blame] | 697 | int ret_val = -ENOENT; |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 698 | u32 doi_cnt = 0; |
Paul Moore | fcd4828 | 2006-09-25 15:56:09 -0700 | [diff] [blame] | 699 | struct cipso_v4_doi *iter_doi; |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 700 | |
| 701 | rcu_read_lock(); |
Paul Moore | fcd4828 | 2006-09-25 15:56:09 -0700 | [diff] [blame] | 702 | list_for_each_entry_rcu(iter_doi, &cipso_v4_doi_list, list) |
Paul Moore | b1edeb1 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 703 | if (atomic_read(&iter_doi->refcount) > 0) { |
Paul Moore | fcd4828 | 2006-09-25 15:56:09 -0700 | [diff] [blame] | 704 | if (doi_cnt++ < *skip_cnt) |
| 705 | continue; |
| 706 | ret_val = callback(iter_doi, cb_arg); |
| 707 | if (ret_val < 0) { |
| 708 | doi_cnt--; |
| 709 | goto doi_walk_return; |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 710 | } |
Paul Moore | fcd4828 | 2006-09-25 15:56:09 -0700 | [diff] [blame] | 711 | } |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 712 | |
Paul Moore | fcd4828 | 2006-09-25 15:56:09 -0700 | [diff] [blame] | 713 | doi_walk_return: |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 714 | rcu_read_unlock(); |
Paul Moore | fcd4828 | 2006-09-25 15:56:09 -0700 | [diff] [blame] | 715 | *skip_cnt = doi_cnt; |
| 716 | return ret_val; |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 717 | } |
| 718 | |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 719 | /* |
| 720 | * Label Mapping Functions |
| 721 | */ |
| 722 | |
| 723 | /** |
| 724 | * cipso_v4_map_lvl_valid - Checks to see if the given level is understood |
| 725 | * @doi_def: the DOI definition |
| 726 | * @level: the level to check |
| 727 | * |
| 728 | * Description: |
| 729 | * Checks the given level against the given DOI definition and returns a |
| 730 | * negative value if the level does not have a valid mapping and a zero value |
| 731 | * if the level is defined by the DOI. |
| 732 | * |
| 733 | */ |
| 734 | static int cipso_v4_map_lvl_valid(const struct cipso_v4_doi *doi_def, u8 level) |
| 735 | { |
| 736 | switch (doi_def->type) { |
| 737 | case CIPSO_V4_MAP_PASS: |
| 738 | return 0; |
Paul Moore | 15c45f7 | 2008-10-10 10:16:34 -0400 | [diff] [blame] | 739 | case CIPSO_V4_MAP_TRANS: |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 740 | if (doi_def->map.std->lvl.cipso[level] < CIPSO_V4_INV_LVL) |
| 741 | return 0; |
| 742 | break; |
| 743 | } |
| 744 | |
| 745 | return -EFAULT; |
| 746 | } |
| 747 | |
| 748 | /** |
| 749 | * cipso_v4_map_lvl_hton - Perform a level mapping from the host to the network |
| 750 | * @doi_def: the DOI definition |
| 751 | * @host_lvl: the host MLS level |
| 752 | * @net_lvl: the network/CIPSO MLS level |
| 753 | * |
| 754 | * Description: |
| 755 | * Perform a label mapping to translate a local MLS level to the correct |
| 756 | * CIPSO level using the given DOI definition. Returns zero on success, |
| 757 | * negative values otherwise. |
| 758 | * |
| 759 | */ |
| 760 | static int cipso_v4_map_lvl_hton(const struct cipso_v4_doi *doi_def, |
| 761 | u32 host_lvl, |
| 762 | u32 *net_lvl) |
| 763 | { |
| 764 | switch (doi_def->type) { |
| 765 | case CIPSO_V4_MAP_PASS: |
| 766 | *net_lvl = host_lvl; |
| 767 | return 0; |
Paul Moore | 15c45f7 | 2008-10-10 10:16:34 -0400 | [diff] [blame] | 768 | case CIPSO_V4_MAP_TRANS: |
Paul Moore | c6387a8 | 2007-03-02 13:19:02 -0800 | [diff] [blame] | 769 | if (host_lvl < doi_def->map.std->lvl.local_size && |
| 770 | doi_def->map.std->lvl.local[host_lvl] < CIPSO_V4_INV_LVL) { |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 771 | *net_lvl = doi_def->map.std->lvl.local[host_lvl]; |
| 772 | return 0; |
| 773 | } |
Paul Moore | c6387a8 | 2007-03-02 13:19:02 -0800 | [diff] [blame] | 774 | return -EPERM; |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 775 | } |
| 776 | |
| 777 | return -EINVAL; |
| 778 | } |
| 779 | |
| 780 | /** |
| 781 | * cipso_v4_map_lvl_ntoh - Perform a level mapping from the network to the host |
| 782 | * @doi_def: the DOI definition |
| 783 | * @net_lvl: the network/CIPSO MLS level |
| 784 | * @host_lvl: the host MLS level |
| 785 | * |
| 786 | * Description: |
| 787 | * Perform a label mapping to translate a CIPSO level to the correct local MLS |
| 788 | * level using the given DOI definition. Returns zero on success, negative |
| 789 | * values otherwise. |
| 790 | * |
| 791 | */ |
| 792 | static int cipso_v4_map_lvl_ntoh(const struct cipso_v4_doi *doi_def, |
| 793 | u32 net_lvl, |
| 794 | u32 *host_lvl) |
| 795 | { |
| 796 | struct cipso_v4_std_map_tbl *map_tbl; |
| 797 | |
| 798 | switch (doi_def->type) { |
| 799 | case CIPSO_V4_MAP_PASS: |
| 800 | *host_lvl = net_lvl; |
| 801 | return 0; |
Paul Moore | 15c45f7 | 2008-10-10 10:16:34 -0400 | [diff] [blame] | 802 | case CIPSO_V4_MAP_TRANS: |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 803 | map_tbl = doi_def->map.std; |
| 804 | if (net_lvl < map_tbl->lvl.cipso_size && |
| 805 | map_tbl->lvl.cipso[net_lvl] < CIPSO_V4_INV_LVL) { |
| 806 | *host_lvl = doi_def->map.std->lvl.cipso[net_lvl]; |
| 807 | return 0; |
| 808 | } |
Paul Moore | c6387a8 | 2007-03-02 13:19:02 -0800 | [diff] [blame] | 809 | return -EPERM; |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 810 | } |
| 811 | |
| 812 | return -EINVAL; |
| 813 | } |
| 814 | |
| 815 | /** |
| 816 | * cipso_v4_map_cat_rbm_valid - Checks to see if the category bitmap is valid |
| 817 | * @doi_def: the DOI definition |
| 818 | * @bitmap: category bitmap |
| 819 | * @bitmap_len: bitmap length in bytes |
| 820 | * |
| 821 | * Description: |
| 822 | * Checks the given category bitmap against the given DOI definition and |
| 823 | * returns a negative value if any of the categories in the bitmap do not have |
| 824 | * a valid mapping and a zero value if all of the categories are valid. |
| 825 | * |
| 826 | */ |
| 827 | static int cipso_v4_map_cat_rbm_valid(const struct cipso_v4_doi *doi_def, |
| 828 | const unsigned char *bitmap, |
| 829 | u32 bitmap_len) |
| 830 | { |
| 831 | int cat = -1; |
| 832 | u32 bitmap_len_bits = bitmap_len * 8; |
Paul Moore | 044a68e | 2006-10-11 19:10:47 -0400 | [diff] [blame] | 833 | u32 cipso_cat_size; |
| 834 | u32 *cipso_array; |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 835 | |
| 836 | switch (doi_def->type) { |
| 837 | case CIPSO_V4_MAP_PASS: |
| 838 | return 0; |
Paul Moore | 15c45f7 | 2008-10-10 10:16:34 -0400 | [diff] [blame] | 839 | case CIPSO_V4_MAP_TRANS: |
Paul Moore | 044a68e | 2006-10-11 19:10:47 -0400 | [diff] [blame] | 840 | cipso_cat_size = doi_def->map.std->cat.cipso_size; |
| 841 | cipso_array = doi_def->map.std->cat.cipso; |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 842 | for (;;) { |
| 843 | cat = cipso_v4_bitmap_walk(bitmap, |
| 844 | bitmap_len_bits, |
| 845 | cat + 1, |
| 846 | 1); |
| 847 | if (cat < 0) |
| 848 | break; |
| 849 | if (cat >= cipso_cat_size || |
| 850 | cipso_array[cat] >= CIPSO_V4_INV_CAT) |
| 851 | return -EFAULT; |
| 852 | } |
| 853 | |
| 854 | if (cat == -1) |
| 855 | return 0; |
| 856 | break; |
| 857 | } |
| 858 | |
| 859 | return -EFAULT; |
| 860 | } |
| 861 | |
| 862 | /** |
| 863 | * cipso_v4_map_cat_rbm_hton - Perform a category mapping from host to network |
| 864 | * @doi_def: the DOI definition |
Paul Moore | 0275276 | 2006-11-29 13:18:18 -0500 | [diff] [blame] | 865 | * @secattr: the security attributes |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 866 | * @net_cat: the zero'd out category bitmap in network/CIPSO format |
| 867 | * @net_cat_len: the length of the CIPSO bitmap in bytes |
| 868 | * |
| 869 | * Description: |
| 870 | * Perform a label mapping to translate a local MLS category bitmap to the |
| 871 | * correct CIPSO bitmap using the given DOI definition. Returns the minimum |
| 872 | * size in bytes of the network bitmap on success, negative values otherwise. |
| 873 | * |
| 874 | */ |
| 875 | static int cipso_v4_map_cat_rbm_hton(const struct cipso_v4_doi *doi_def, |
Paul Moore | 0275276 | 2006-11-29 13:18:18 -0500 | [diff] [blame] | 876 | const struct netlbl_lsm_secattr *secattr, |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 877 | unsigned char *net_cat, |
| 878 | u32 net_cat_len) |
| 879 | { |
| 880 | int host_spot = -1; |
Paul Moore | 0275276 | 2006-11-29 13:18:18 -0500 | [diff] [blame] | 881 | u32 net_spot = CIPSO_V4_INV_CAT; |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 882 | u32 net_spot_max = 0; |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 883 | u32 net_clen_bits = net_cat_len * 8; |
Paul Moore | 0275276 | 2006-11-29 13:18:18 -0500 | [diff] [blame] | 884 | u32 host_cat_size = 0; |
| 885 | u32 *host_cat_array = NULL; |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 886 | |
Paul Moore | 15c45f7 | 2008-10-10 10:16:34 -0400 | [diff] [blame] | 887 | if (doi_def->type == CIPSO_V4_MAP_TRANS) { |
Paul Moore | 044a68e | 2006-10-11 19:10:47 -0400 | [diff] [blame] | 888 | host_cat_size = doi_def->map.std->cat.local_size; |
| 889 | host_cat_array = doi_def->map.std->cat.local; |
Paul Moore | 0275276 | 2006-11-29 13:18:18 -0500 | [diff] [blame] | 890 | } |
| 891 | |
| 892 | for (;;) { |
Paul Moore | 4fbe63d | 2014-08-01 11:17:37 -0400 | [diff] [blame] | 893 | host_spot = netlbl_catmap_walk(secattr->attr.mls.cat, |
| 894 | host_spot + 1); |
Paul Moore | 0275276 | 2006-11-29 13:18:18 -0500 | [diff] [blame] | 895 | if (host_spot < 0) |
| 896 | break; |
| 897 | |
| 898 | switch (doi_def->type) { |
| 899 | case CIPSO_V4_MAP_PASS: |
| 900 | net_spot = host_spot; |
| 901 | break; |
Paul Moore | 15c45f7 | 2008-10-10 10:16:34 -0400 | [diff] [blame] | 902 | case CIPSO_V4_MAP_TRANS: |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 903 | if (host_spot >= host_cat_size) |
| 904 | return -EPERM; |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 905 | net_spot = host_cat_array[host_spot]; |
Paul Moore | 9fade4b | 2006-11-17 17:38:50 -0500 | [diff] [blame] | 906 | if (net_spot >= CIPSO_V4_INV_CAT) |
| 907 | return -EPERM; |
Paul Moore | 0275276 | 2006-11-29 13:18:18 -0500 | [diff] [blame] | 908 | break; |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 909 | } |
Paul Moore | 0275276 | 2006-11-29 13:18:18 -0500 | [diff] [blame] | 910 | if (net_spot >= net_clen_bits) |
| 911 | return -ENOSPC; |
| 912 | cipso_v4_bitmap_setbit(net_cat, net_spot, 1); |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 913 | |
Paul Moore | 0275276 | 2006-11-29 13:18:18 -0500 | [diff] [blame] | 914 | if (net_spot > net_spot_max) |
| 915 | net_spot_max = net_spot; |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 916 | } |
| 917 | |
Paul Moore | 0275276 | 2006-11-29 13:18:18 -0500 | [diff] [blame] | 918 | if (++net_spot_max % 8) |
| 919 | return net_spot_max / 8 + 1; |
| 920 | return net_spot_max / 8; |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 921 | } |
| 922 | |
| 923 | /** |
| 924 | * cipso_v4_map_cat_rbm_ntoh - Perform a category mapping from network to host |
| 925 | * @doi_def: the DOI definition |
| 926 | * @net_cat: the category bitmap in network/CIPSO format |
| 927 | * @net_cat_len: the length of the CIPSO bitmap in bytes |
Paul Moore | 0275276 | 2006-11-29 13:18:18 -0500 | [diff] [blame] | 928 | * @secattr: the security attributes |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 929 | * |
| 930 | * Description: |
| 931 | * Perform a label mapping to translate a CIPSO bitmap to the correct local |
Paul Moore | 0275276 | 2006-11-29 13:18:18 -0500 | [diff] [blame] | 932 | * MLS category bitmap using the given DOI definition. Returns zero on |
| 933 | * success, negative values on failure. |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 934 | * |
| 935 | */ |
| 936 | static int cipso_v4_map_cat_rbm_ntoh(const struct cipso_v4_doi *doi_def, |
| 937 | const unsigned char *net_cat, |
| 938 | u32 net_cat_len, |
Paul Moore | 0275276 | 2006-11-29 13:18:18 -0500 | [diff] [blame] | 939 | struct netlbl_lsm_secattr *secattr) |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 940 | { |
Paul Moore | 0275276 | 2006-11-29 13:18:18 -0500 | [diff] [blame] | 941 | int ret_val; |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 942 | int net_spot = -1; |
Paul Moore | 0275276 | 2006-11-29 13:18:18 -0500 | [diff] [blame] | 943 | u32 host_spot = CIPSO_V4_INV_CAT; |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 944 | u32 net_clen_bits = net_cat_len * 8; |
Paul Moore | 0275276 | 2006-11-29 13:18:18 -0500 | [diff] [blame] | 945 | u32 net_cat_size = 0; |
| 946 | u32 *net_cat_array = NULL; |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 947 | |
Paul Moore | 15c45f7 | 2008-10-10 10:16:34 -0400 | [diff] [blame] | 948 | if (doi_def->type == CIPSO_V4_MAP_TRANS) { |
Paul Moore | 044a68e | 2006-10-11 19:10:47 -0400 | [diff] [blame] | 949 | net_cat_size = doi_def->map.std->cat.cipso_size; |
| 950 | net_cat_array = doi_def->map.std->cat.cipso; |
Paul Moore | 0275276 | 2006-11-29 13:18:18 -0500 | [diff] [blame] | 951 | } |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 952 | |
Paul Moore | 0275276 | 2006-11-29 13:18:18 -0500 | [diff] [blame] | 953 | for (;;) { |
| 954 | net_spot = cipso_v4_bitmap_walk(net_cat, |
| 955 | net_clen_bits, |
| 956 | net_spot + 1, |
| 957 | 1); |
| 958 | if (net_spot < 0) { |
| 959 | if (net_spot == -2) |
| 960 | return -EFAULT; |
| 961 | return 0; |
| 962 | } |
| 963 | |
| 964 | switch (doi_def->type) { |
| 965 | case CIPSO_V4_MAP_PASS: |
| 966 | host_spot = net_spot; |
| 967 | break; |
Paul Moore | 15c45f7 | 2008-10-10 10:16:34 -0400 | [diff] [blame] | 968 | case CIPSO_V4_MAP_TRANS: |
Paul Moore | 0275276 | 2006-11-29 13:18:18 -0500 | [diff] [blame] | 969 | if (net_spot >= net_cat_size) |
| 970 | return -EPERM; |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 971 | host_spot = net_cat_array[net_spot]; |
Paul Moore | 9fade4b | 2006-11-17 17:38:50 -0500 | [diff] [blame] | 972 | if (host_spot >= CIPSO_V4_INV_CAT) |
| 973 | return -EPERM; |
Paul Moore | 0275276 | 2006-11-29 13:18:18 -0500 | [diff] [blame] | 974 | break; |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 975 | } |
Paul Moore | 4fbe63d | 2014-08-01 11:17:37 -0400 | [diff] [blame] | 976 | ret_val = netlbl_catmap_setbit(&secattr->attr.mls.cat, |
Paul Moore | 0275276 | 2006-11-29 13:18:18 -0500 | [diff] [blame] | 977 | host_spot, |
| 978 | GFP_ATOMIC); |
| 979 | if (ret_val != 0) |
| 980 | return ret_val; |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 981 | } |
| 982 | |
| 983 | return -EINVAL; |
| 984 | } |
| 985 | |
Paul Moore | 654bbc2 | 2006-11-29 13:18:19 -0500 | [diff] [blame] | 986 | /** |
| 987 | * cipso_v4_map_cat_enum_valid - Checks to see if the categories are valid |
| 988 | * @doi_def: the DOI definition |
| 989 | * @enumcat: category list |
| 990 | * @enumcat_len: length of the category list in bytes |
| 991 | * |
| 992 | * Description: |
| 993 | * Checks the given categories against the given DOI definition and returns a |
| 994 | * negative value if any of the categories do not have a valid mapping and a |
| 995 | * zero value if all of the categories are valid. |
| 996 | * |
| 997 | */ |
| 998 | static int cipso_v4_map_cat_enum_valid(const struct cipso_v4_doi *doi_def, |
| 999 | const unsigned char *enumcat, |
| 1000 | u32 enumcat_len) |
| 1001 | { |
| 1002 | u16 cat; |
| 1003 | int cat_prev = -1; |
| 1004 | u32 iter; |
| 1005 | |
| 1006 | if (doi_def->type != CIPSO_V4_MAP_PASS || enumcat_len & 0x01) |
| 1007 | return -EFAULT; |
| 1008 | |
| 1009 | for (iter = 0; iter < enumcat_len; iter += 2) { |
Harvey Harrison | d3e2ce3 | 2008-05-02 16:26:16 -0700 | [diff] [blame] | 1010 | cat = get_unaligned_be16(&enumcat[iter]); |
Paul Moore | 654bbc2 | 2006-11-29 13:18:19 -0500 | [diff] [blame] | 1011 | if (cat <= cat_prev) |
| 1012 | return -EFAULT; |
| 1013 | cat_prev = cat; |
| 1014 | } |
| 1015 | |
| 1016 | return 0; |
| 1017 | } |
| 1018 | |
| 1019 | /** |
| 1020 | * cipso_v4_map_cat_enum_hton - Perform a category mapping from host to network |
| 1021 | * @doi_def: the DOI definition |
| 1022 | * @secattr: the security attributes |
| 1023 | * @net_cat: the zero'd out category list in network/CIPSO format |
| 1024 | * @net_cat_len: the length of the CIPSO category list in bytes |
| 1025 | * |
| 1026 | * Description: |
| 1027 | * Perform a label mapping to translate a local MLS category bitmap to the |
| 1028 | * correct CIPSO category list using the given DOI definition. Returns the |
| 1029 | * size in bytes of the network category bitmap on success, negative values |
| 1030 | * otherwise. |
| 1031 | * |
| 1032 | */ |
| 1033 | static int cipso_v4_map_cat_enum_hton(const struct cipso_v4_doi *doi_def, |
| 1034 | const struct netlbl_lsm_secattr *secattr, |
| 1035 | unsigned char *net_cat, |
| 1036 | u32 net_cat_len) |
| 1037 | { |
| 1038 | int cat = -1; |
| 1039 | u32 cat_iter = 0; |
| 1040 | |
| 1041 | for (;;) { |
Paul Moore | 4fbe63d | 2014-08-01 11:17:37 -0400 | [diff] [blame] | 1042 | cat = netlbl_catmap_walk(secattr->attr.mls.cat, cat + 1); |
Paul Moore | 654bbc2 | 2006-11-29 13:18:19 -0500 | [diff] [blame] | 1043 | if (cat < 0) |
| 1044 | break; |
| 1045 | if ((cat_iter + 2) > net_cat_len) |
| 1046 | return -ENOSPC; |
| 1047 | |
| 1048 | *((__be16 *)&net_cat[cat_iter]) = htons(cat); |
| 1049 | cat_iter += 2; |
| 1050 | } |
| 1051 | |
| 1052 | return cat_iter; |
| 1053 | } |
| 1054 | |
| 1055 | /** |
| 1056 | * cipso_v4_map_cat_enum_ntoh - Perform a category mapping from network to host |
| 1057 | * @doi_def: the DOI definition |
| 1058 | * @net_cat: the category list in network/CIPSO format |
| 1059 | * @net_cat_len: the length of the CIPSO bitmap in bytes |
| 1060 | * @secattr: the security attributes |
| 1061 | * |
| 1062 | * Description: |
| 1063 | * Perform a label mapping to translate a CIPSO category list to the correct |
| 1064 | * local MLS category bitmap using the given DOI definition. Returns zero on |
| 1065 | * success, negative values on failure. |
| 1066 | * |
| 1067 | */ |
| 1068 | static int cipso_v4_map_cat_enum_ntoh(const struct cipso_v4_doi *doi_def, |
| 1069 | const unsigned char *net_cat, |
| 1070 | u32 net_cat_len, |
| 1071 | struct netlbl_lsm_secattr *secattr) |
| 1072 | { |
| 1073 | int ret_val; |
| 1074 | u32 iter; |
| 1075 | |
| 1076 | for (iter = 0; iter < net_cat_len; iter += 2) { |
Paul Moore | 4fbe63d | 2014-08-01 11:17:37 -0400 | [diff] [blame] | 1077 | ret_val = netlbl_catmap_setbit(&secattr->attr.mls.cat, |
| 1078 | get_unaligned_be16(&net_cat[iter]), |
| 1079 | GFP_ATOMIC); |
Paul Moore | 654bbc2 | 2006-11-29 13:18:19 -0500 | [diff] [blame] | 1080 | if (ret_val != 0) |
| 1081 | return ret_val; |
| 1082 | } |
| 1083 | |
| 1084 | return 0; |
| 1085 | } |
| 1086 | |
Paul Moore | 484b366 | 2006-11-29 13:18:20 -0500 | [diff] [blame] | 1087 | /** |
| 1088 | * cipso_v4_map_cat_rng_valid - Checks to see if the categories are valid |
| 1089 | * @doi_def: the DOI definition |
| 1090 | * @rngcat: category list |
| 1091 | * @rngcat_len: length of the category list in bytes |
| 1092 | * |
| 1093 | * Description: |
| 1094 | * Checks the given categories against the given DOI definition and returns a |
| 1095 | * negative value if any of the categories do not have a valid mapping and a |
| 1096 | * zero value if all of the categories are valid. |
| 1097 | * |
| 1098 | */ |
| 1099 | static int cipso_v4_map_cat_rng_valid(const struct cipso_v4_doi *doi_def, |
| 1100 | const unsigned char *rngcat, |
| 1101 | u32 rngcat_len) |
| 1102 | { |
| 1103 | u16 cat_high; |
| 1104 | u16 cat_low; |
| 1105 | u32 cat_prev = CIPSO_V4_MAX_REM_CATS + 1; |
| 1106 | u32 iter; |
| 1107 | |
| 1108 | if (doi_def->type != CIPSO_V4_MAP_PASS || rngcat_len & 0x01) |
| 1109 | return -EFAULT; |
| 1110 | |
| 1111 | for (iter = 0; iter < rngcat_len; iter += 4) { |
Harvey Harrison | d3e2ce3 | 2008-05-02 16:26:16 -0700 | [diff] [blame] | 1112 | cat_high = get_unaligned_be16(&rngcat[iter]); |
Paul Moore | 484b366 | 2006-11-29 13:18:20 -0500 | [diff] [blame] | 1113 | if ((iter + 4) <= rngcat_len) |
Harvey Harrison | d3e2ce3 | 2008-05-02 16:26:16 -0700 | [diff] [blame] | 1114 | cat_low = get_unaligned_be16(&rngcat[iter + 2]); |
Paul Moore | 484b366 | 2006-11-29 13:18:20 -0500 | [diff] [blame] | 1115 | else |
| 1116 | cat_low = 0; |
| 1117 | |
| 1118 | if (cat_high > cat_prev) |
| 1119 | return -EFAULT; |
| 1120 | |
| 1121 | cat_prev = cat_low; |
| 1122 | } |
| 1123 | |
| 1124 | return 0; |
| 1125 | } |
| 1126 | |
| 1127 | /** |
| 1128 | * cipso_v4_map_cat_rng_hton - Perform a category mapping from host to network |
| 1129 | * @doi_def: the DOI definition |
| 1130 | * @secattr: the security attributes |
| 1131 | * @net_cat: the zero'd out category list in network/CIPSO format |
| 1132 | * @net_cat_len: the length of the CIPSO category list in bytes |
| 1133 | * |
| 1134 | * Description: |
| 1135 | * Perform a label mapping to translate a local MLS category bitmap to the |
| 1136 | * correct CIPSO category list using the given DOI definition. Returns the |
| 1137 | * size in bytes of the network category bitmap on success, negative values |
| 1138 | * otherwise. |
| 1139 | * |
| 1140 | */ |
| 1141 | static int cipso_v4_map_cat_rng_hton(const struct cipso_v4_doi *doi_def, |
| 1142 | const struct netlbl_lsm_secattr *secattr, |
| 1143 | unsigned char *net_cat, |
| 1144 | u32 net_cat_len) |
| 1145 | { |
Paul Moore | 484b366 | 2006-11-29 13:18:20 -0500 | [diff] [blame] | 1146 | int iter = -1; |
Paul Moore | f998e8c | 2007-02-28 15:14:20 -0500 | [diff] [blame] | 1147 | u16 array[CIPSO_V4_TAG_RNG_CAT_MAX * 2]; |
Paul Moore | 484b366 | 2006-11-29 13:18:20 -0500 | [diff] [blame] | 1148 | u32 array_cnt = 0; |
| 1149 | u32 cat_size = 0; |
| 1150 | |
Paul Moore | f998e8c | 2007-02-28 15:14:20 -0500 | [diff] [blame] | 1151 | /* make sure we don't overflow the 'array[]' variable */ |
Paul Moore | 128c6b6 | 2007-02-28 15:14:21 -0500 | [diff] [blame] | 1152 | if (net_cat_len > |
| 1153 | (CIPSO_V4_OPT_LEN_MAX - CIPSO_V4_HDR_LEN - CIPSO_V4_TAG_RNG_BLEN)) |
| 1154 | return -ENOSPC; |
Paul Moore | 484b366 | 2006-11-29 13:18:20 -0500 | [diff] [blame] | 1155 | |
| 1156 | for (;;) { |
Paul Moore | 4fbe63d | 2014-08-01 11:17:37 -0400 | [diff] [blame] | 1157 | iter = netlbl_catmap_walk(secattr->attr.mls.cat, iter + 1); |
Paul Moore | 484b366 | 2006-11-29 13:18:20 -0500 | [diff] [blame] | 1158 | if (iter < 0) |
| 1159 | break; |
| 1160 | cat_size += (iter == 0 ? 0 : sizeof(u16)); |
| 1161 | if (cat_size > net_cat_len) |
| 1162 | return -ENOSPC; |
| 1163 | array[array_cnt++] = iter; |
| 1164 | |
Paul Moore | 4fbe63d | 2014-08-01 11:17:37 -0400 | [diff] [blame] | 1165 | iter = netlbl_catmap_walkrng(secattr->attr.mls.cat, iter); |
Paul Moore | 484b366 | 2006-11-29 13:18:20 -0500 | [diff] [blame] | 1166 | if (iter < 0) |
| 1167 | return -EFAULT; |
| 1168 | cat_size += sizeof(u16); |
| 1169 | if (cat_size > net_cat_len) |
| 1170 | return -ENOSPC; |
| 1171 | array[array_cnt++] = iter; |
| 1172 | } |
| 1173 | |
| 1174 | for (iter = 0; array_cnt > 0;) { |
| 1175 | *((__be16 *)&net_cat[iter]) = htons(array[--array_cnt]); |
| 1176 | iter += 2; |
| 1177 | array_cnt--; |
| 1178 | if (array[array_cnt] != 0) { |
| 1179 | *((__be16 *)&net_cat[iter]) = htons(array[array_cnt]); |
| 1180 | iter += 2; |
| 1181 | } |
| 1182 | } |
| 1183 | |
| 1184 | return cat_size; |
| 1185 | } |
| 1186 | |
| 1187 | /** |
| 1188 | * cipso_v4_map_cat_rng_ntoh - Perform a category mapping from network to host |
| 1189 | * @doi_def: the DOI definition |
| 1190 | * @net_cat: the category list in network/CIPSO format |
| 1191 | * @net_cat_len: the length of the CIPSO bitmap in bytes |
| 1192 | * @secattr: the security attributes |
| 1193 | * |
| 1194 | * Description: |
| 1195 | * Perform a label mapping to translate a CIPSO category list to the correct |
| 1196 | * local MLS category bitmap using the given DOI definition. Returns zero on |
| 1197 | * success, negative values on failure. |
| 1198 | * |
| 1199 | */ |
| 1200 | static int cipso_v4_map_cat_rng_ntoh(const struct cipso_v4_doi *doi_def, |
| 1201 | const unsigned char *net_cat, |
| 1202 | u32 net_cat_len, |
| 1203 | struct netlbl_lsm_secattr *secattr) |
| 1204 | { |
| 1205 | int ret_val; |
| 1206 | u32 net_iter; |
| 1207 | u16 cat_low; |
| 1208 | u16 cat_high; |
| 1209 | |
Stephen Hemminger | 132adf5 | 2007-03-08 20:44:43 -0800 | [diff] [blame] | 1210 | for (net_iter = 0; net_iter < net_cat_len; net_iter += 4) { |
Harvey Harrison | d3e2ce3 | 2008-05-02 16:26:16 -0700 | [diff] [blame] | 1211 | cat_high = get_unaligned_be16(&net_cat[net_iter]); |
Paul Moore | 484b366 | 2006-11-29 13:18:20 -0500 | [diff] [blame] | 1212 | if ((net_iter + 4) <= net_cat_len) |
Harvey Harrison | d3e2ce3 | 2008-05-02 16:26:16 -0700 | [diff] [blame] | 1213 | cat_low = get_unaligned_be16(&net_cat[net_iter + 2]); |
Paul Moore | 484b366 | 2006-11-29 13:18:20 -0500 | [diff] [blame] | 1214 | else |
| 1215 | cat_low = 0; |
| 1216 | |
Paul Moore | 4fbe63d | 2014-08-01 11:17:37 -0400 | [diff] [blame] | 1217 | ret_val = netlbl_catmap_setrng(&secattr->attr.mls.cat, |
| 1218 | cat_low, |
| 1219 | cat_high, |
| 1220 | GFP_ATOMIC); |
Paul Moore | 484b366 | 2006-11-29 13:18:20 -0500 | [diff] [blame] | 1221 | if (ret_val != 0) |
| 1222 | return ret_val; |
| 1223 | } |
| 1224 | |
| 1225 | return 0; |
| 1226 | } |
| 1227 | |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1228 | /* |
| 1229 | * Protocol Handling Functions |
| 1230 | */ |
| 1231 | |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1232 | /** |
| 1233 | * cipso_v4_gentag_hdr - Generate a CIPSO option header |
| 1234 | * @doi_def: the DOI definition |
Paul Moore | 91b1ed0 | 2006-11-17 17:38:49 -0500 | [diff] [blame] | 1235 | * @len: the total tag length in bytes, not including this header |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1236 | * @buf: the CIPSO option buffer |
| 1237 | * |
| 1238 | * Description: |
Paul Moore | 91b1ed0 | 2006-11-17 17:38:49 -0500 | [diff] [blame] | 1239 | * Write a CIPSO header into the beginning of @buffer. |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1240 | * |
| 1241 | */ |
Paul Moore | 91b1ed0 | 2006-11-17 17:38:49 -0500 | [diff] [blame] | 1242 | static void cipso_v4_gentag_hdr(const struct cipso_v4_doi *doi_def, |
| 1243 | unsigned char *buf, |
| 1244 | u32 len) |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1245 | { |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1246 | buf[0] = IPOPT_CIPSO; |
| 1247 | buf[1] = CIPSO_V4_HDR_LEN + len; |
Al Viro | 714e85b | 2006-11-14 20:51:49 -0800 | [diff] [blame] | 1248 | *(__be32 *)&buf[2] = htonl(doi_def->doi); |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1249 | } |
| 1250 | |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1251 | /** |
| 1252 | * cipso_v4_gentag_rbm - Generate a CIPSO restricted bitmap tag (type #1) |
| 1253 | * @doi_def: the DOI definition |
| 1254 | * @secattr: the security attributes |
| 1255 | * @buffer: the option buffer |
| 1256 | * @buffer_len: length of buffer in bytes |
| 1257 | * |
| 1258 | * Description: |
| 1259 | * Generate a CIPSO option using the restricted bitmap tag, tag type #1. The |
| 1260 | * actual buffer length may be larger than the indicated size due to |
Paul Moore | 91b1ed0 | 2006-11-17 17:38:49 -0500 | [diff] [blame] | 1261 | * translation between host and network category bitmaps. Returns the size of |
| 1262 | * the tag on success, negative values on failure. |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1263 | * |
| 1264 | */ |
| 1265 | static int cipso_v4_gentag_rbm(const struct cipso_v4_doi *doi_def, |
| 1266 | const struct netlbl_lsm_secattr *secattr, |
Paul Moore | 91b1ed0 | 2006-11-17 17:38:49 -0500 | [diff] [blame] | 1267 | unsigned char *buffer, |
| 1268 | u32 buffer_len) |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1269 | { |
Paul Moore | 701a90b | 2006-11-17 17:38:46 -0500 | [diff] [blame] | 1270 | int ret_val; |
Paul Moore | 91b1ed0 | 2006-11-17 17:38:49 -0500 | [diff] [blame] | 1271 | u32 tag_len; |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1272 | u32 level; |
| 1273 | |
Paul Moore | 701a90b | 2006-11-17 17:38:46 -0500 | [diff] [blame] | 1274 | if ((secattr->flags & NETLBL_SECATTR_MLS_LVL) == 0) |
| 1275 | return -EPERM; |
| 1276 | |
Paul Moore | 16efd45 | 2008-01-29 08:37:59 -0500 | [diff] [blame] | 1277 | ret_val = cipso_v4_map_lvl_hton(doi_def, |
| 1278 | secattr->attr.mls.lvl, |
| 1279 | &level); |
Paul Moore | 91b1ed0 | 2006-11-17 17:38:49 -0500 | [diff] [blame] | 1280 | if (ret_val != 0) |
| 1281 | return ret_val; |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1282 | |
Paul Moore | 91b1ed0 | 2006-11-17 17:38:49 -0500 | [diff] [blame] | 1283 | if (secattr->flags & NETLBL_SECATTR_MLS_CAT) { |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1284 | ret_val = cipso_v4_map_cat_rbm_hton(doi_def, |
Paul Moore | 0275276 | 2006-11-29 13:18:18 -0500 | [diff] [blame] | 1285 | secattr, |
Paul Moore | 91b1ed0 | 2006-11-17 17:38:49 -0500 | [diff] [blame] | 1286 | &buffer[4], |
| 1287 | buffer_len - 4); |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1288 | if (ret_val < 0) |
Paul Moore | 91b1ed0 | 2006-11-17 17:38:49 -0500 | [diff] [blame] | 1289 | return ret_val; |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1290 | |
| 1291 | /* This will send packets using the "optimized" format when |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1292 | * possible as specified in section 3.4.2.6 of the |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1293 | * CIPSO draft. */ |
Paul Moore | 701a90b | 2006-11-17 17:38:46 -0500 | [diff] [blame] | 1294 | if (cipso_v4_rbm_optfmt && ret_val > 0 && ret_val <= 10) |
Paul Moore | 91b1ed0 | 2006-11-17 17:38:49 -0500 | [diff] [blame] | 1295 | tag_len = 14; |
Paul Moore | 701a90b | 2006-11-17 17:38:46 -0500 | [diff] [blame] | 1296 | else |
Paul Moore | 91b1ed0 | 2006-11-17 17:38:49 -0500 | [diff] [blame] | 1297 | tag_len = 4 + ret_val; |
| 1298 | } else |
| 1299 | tag_len = 4; |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1300 | |
Paul Moore | 15c45f7 | 2008-10-10 10:16:34 -0400 | [diff] [blame] | 1301 | buffer[0] = CIPSO_V4_TAG_RBITMAP; |
Paul Moore | 91b1ed0 | 2006-11-17 17:38:49 -0500 | [diff] [blame] | 1302 | buffer[1] = tag_len; |
| 1303 | buffer[3] = level; |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1304 | |
Paul Moore | 91b1ed0 | 2006-11-17 17:38:49 -0500 | [diff] [blame] | 1305 | return tag_len; |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1306 | } |
| 1307 | |
| 1308 | /** |
| 1309 | * cipso_v4_parsetag_rbm - Parse a CIPSO restricted bitmap tag |
| 1310 | * @doi_def: the DOI definition |
| 1311 | * @tag: the CIPSO tag |
| 1312 | * @secattr: the security attributes |
| 1313 | * |
| 1314 | * Description: |
| 1315 | * Parse a CIPSO restricted bitmap tag (tag type #1) and return the security |
| 1316 | * attributes in @secattr. Return zero on success, negatives values on |
| 1317 | * failure. |
| 1318 | * |
| 1319 | */ |
| 1320 | static int cipso_v4_parsetag_rbm(const struct cipso_v4_doi *doi_def, |
| 1321 | const unsigned char *tag, |
| 1322 | struct netlbl_lsm_secattr *secattr) |
| 1323 | { |
| 1324 | int ret_val; |
| 1325 | u8 tag_len = tag[1]; |
| 1326 | u32 level; |
| 1327 | |
| 1328 | ret_val = cipso_v4_map_lvl_ntoh(doi_def, tag[3], &level); |
| 1329 | if (ret_val != 0) |
| 1330 | return ret_val; |
Paul Moore | 16efd45 | 2008-01-29 08:37:59 -0500 | [diff] [blame] | 1331 | secattr->attr.mls.lvl = level; |
Paul Moore | 701a90b | 2006-11-17 17:38:46 -0500 | [diff] [blame] | 1332 | secattr->flags |= NETLBL_SECATTR_MLS_LVL; |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1333 | |
| 1334 | if (tag_len > 4) { |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1335 | ret_val = cipso_v4_map_cat_rbm_ntoh(doi_def, |
| 1336 | &tag[4], |
| 1337 | tag_len - 4, |
Paul Moore | 0275276 | 2006-11-29 13:18:18 -0500 | [diff] [blame] | 1338 | secattr); |
| 1339 | if (ret_val != 0) { |
Paul Moore | 4fbe63d | 2014-08-01 11:17:37 -0400 | [diff] [blame] | 1340 | netlbl_catmap_free(secattr->attr.mls.cat); |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1341 | return ret_val; |
| 1342 | } |
Paul Moore | 0275276 | 2006-11-29 13:18:18 -0500 | [diff] [blame] | 1343 | |
| 1344 | secattr->flags |= NETLBL_SECATTR_MLS_CAT; |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1345 | } |
| 1346 | |
| 1347 | return 0; |
| 1348 | } |
| 1349 | |
| 1350 | /** |
Paul Moore | 654bbc2 | 2006-11-29 13:18:19 -0500 | [diff] [blame] | 1351 | * cipso_v4_gentag_enum - Generate a CIPSO enumerated tag (type #2) |
| 1352 | * @doi_def: the DOI definition |
| 1353 | * @secattr: the security attributes |
| 1354 | * @buffer: the option buffer |
| 1355 | * @buffer_len: length of buffer in bytes |
| 1356 | * |
| 1357 | * Description: |
| 1358 | * Generate a CIPSO option using the enumerated tag, tag type #2. Returns the |
| 1359 | * size of the tag on success, negative values on failure. |
| 1360 | * |
| 1361 | */ |
| 1362 | static int cipso_v4_gentag_enum(const struct cipso_v4_doi *doi_def, |
| 1363 | const struct netlbl_lsm_secattr *secattr, |
| 1364 | unsigned char *buffer, |
| 1365 | u32 buffer_len) |
| 1366 | { |
| 1367 | int ret_val; |
| 1368 | u32 tag_len; |
| 1369 | u32 level; |
| 1370 | |
| 1371 | if (!(secattr->flags & NETLBL_SECATTR_MLS_LVL)) |
| 1372 | return -EPERM; |
| 1373 | |
Paul Moore | 16efd45 | 2008-01-29 08:37:59 -0500 | [diff] [blame] | 1374 | ret_val = cipso_v4_map_lvl_hton(doi_def, |
| 1375 | secattr->attr.mls.lvl, |
| 1376 | &level); |
Paul Moore | 654bbc2 | 2006-11-29 13:18:19 -0500 | [diff] [blame] | 1377 | if (ret_val != 0) |
| 1378 | return ret_val; |
| 1379 | |
| 1380 | if (secattr->flags & NETLBL_SECATTR_MLS_CAT) { |
| 1381 | ret_val = cipso_v4_map_cat_enum_hton(doi_def, |
| 1382 | secattr, |
| 1383 | &buffer[4], |
| 1384 | buffer_len - 4); |
| 1385 | if (ret_val < 0) |
| 1386 | return ret_val; |
| 1387 | |
| 1388 | tag_len = 4 + ret_val; |
| 1389 | } else |
| 1390 | tag_len = 4; |
| 1391 | |
Paul Moore | 15c45f7 | 2008-10-10 10:16:34 -0400 | [diff] [blame] | 1392 | buffer[0] = CIPSO_V4_TAG_ENUM; |
Paul Moore | 654bbc2 | 2006-11-29 13:18:19 -0500 | [diff] [blame] | 1393 | buffer[1] = tag_len; |
| 1394 | buffer[3] = level; |
| 1395 | |
| 1396 | return tag_len; |
| 1397 | } |
| 1398 | |
| 1399 | /** |
| 1400 | * cipso_v4_parsetag_enum - Parse a CIPSO enumerated tag |
| 1401 | * @doi_def: the DOI definition |
| 1402 | * @tag: the CIPSO tag |
| 1403 | * @secattr: the security attributes |
| 1404 | * |
| 1405 | * Description: |
| 1406 | * Parse a CIPSO enumerated tag (tag type #2) and return the security |
| 1407 | * attributes in @secattr. Return zero on success, negatives values on |
| 1408 | * failure. |
| 1409 | * |
| 1410 | */ |
| 1411 | static int cipso_v4_parsetag_enum(const struct cipso_v4_doi *doi_def, |
| 1412 | const unsigned char *tag, |
| 1413 | struct netlbl_lsm_secattr *secattr) |
| 1414 | { |
| 1415 | int ret_val; |
| 1416 | u8 tag_len = tag[1]; |
| 1417 | u32 level; |
| 1418 | |
| 1419 | ret_val = cipso_v4_map_lvl_ntoh(doi_def, tag[3], &level); |
| 1420 | if (ret_val != 0) |
| 1421 | return ret_val; |
Paul Moore | 16efd45 | 2008-01-29 08:37:59 -0500 | [diff] [blame] | 1422 | secattr->attr.mls.lvl = level; |
Paul Moore | 654bbc2 | 2006-11-29 13:18:19 -0500 | [diff] [blame] | 1423 | secattr->flags |= NETLBL_SECATTR_MLS_LVL; |
| 1424 | |
| 1425 | if (tag_len > 4) { |
Paul Moore | 654bbc2 | 2006-11-29 13:18:19 -0500 | [diff] [blame] | 1426 | ret_val = cipso_v4_map_cat_enum_ntoh(doi_def, |
| 1427 | &tag[4], |
| 1428 | tag_len - 4, |
| 1429 | secattr); |
| 1430 | if (ret_val != 0) { |
Paul Moore | 4fbe63d | 2014-08-01 11:17:37 -0400 | [diff] [blame] | 1431 | netlbl_catmap_free(secattr->attr.mls.cat); |
Paul Moore | 654bbc2 | 2006-11-29 13:18:19 -0500 | [diff] [blame] | 1432 | return ret_val; |
| 1433 | } |
| 1434 | |
| 1435 | secattr->flags |= NETLBL_SECATTR_MLS_CAT; |
| 1436 | } |
| 1437 | |
| 1438 | return 0; |
| 1439 | } |
| 1440 | |
| 1441 | /** |
Paul Moore | 484b366 | 2006-11-29 13:18:20 -0500 | [diff] [blame] | 1442 | * cipso_v4_gentag_rng - Generate a CIPSO ranged tag (type #5) |
| 1443 | * @doi_def: the DOI definition |
| 1444 | * @secattr: the security attributes |
| 1445 | * @buffer: the option buffer |
| 1446 | * @buffer_len: length of buffer in bytes |
| 1447 | * |
| 1448 | * Description: |
| 1449 | * Generate a CIPSO option using the ranged tag, tag type #5. Returns the |
| 1450 | * size of the tag on success, negative values on failure. |
| 1451 | * |
| 1452 | */ |
| 1453 | static int cipso_v4_gentag_rng(const struct cipso_v4_doi *doi_def, |
| 1454 | const struct netlbl_lsm_secattr *secattr, |
| 1455 | unsigned char *buffer, |
| 1456 | u32 buffer_len) |
| 1457 | { |
| 1458 | int ret_val; |
| 1459 | u32 tag_len; |
| 1460 | u32 level; |
| 1461 | |
| 1462 | if (!(secattr->flags & NETLBL_SECATTR_MLS_LVL)) |
| 1463 | return -EPERM; |
| 1464 | |
Paul Moore | 16efd45 | 2008-01-29 08:37:59 -0500 | [diff] [blame] | 1465 | ret_val = cipso_v4_map_lvl_hton(doi_def, |
| 1466 | secattr->attr.mls.lvl, |
| 1467 | &level); |
Paul Moore | 484b366 | 2006-11-29 13:18:20 -0500 | [diff] [blame] | 1468 | if (ret_val != 0) |
| 1469 | return ret_val; |
| 1470 | |
| 1471 | if (secattr->flags & NETLBL_SECATTR_MLS_CAT) { |
| 1472 | ret_val = cipso_v4_map_cat_rng_hton(doi_def, |
| 1473 | secattr, |
| 1474 | &buffer[4], |
| 1475 | buffer_len - 4); |
| 1476 | if (ret_val < 0) |
| 1477 | return ret_val; |
| 1478 | |
| 1479 | tag_len = 4 + ret_val; |
| 1480 | } else |
| 1481 | tag_len = 4; |
| 1482 | |
Paul Moore | 15c45f7 | 2008-10-10 10:16:34 -0400 | [diff] [blame] | 1483 | buffer[0] = CIPSO_V4_TAG_RANGE; |
Paul Moore | 484b366 | 2006-11-29 13:18:20 -0500 | [diff] [blame] | 1484 | buffer[1] = tag_len; |
| 1485 | buffer[3] = level; |
| 1486 | |
| 1487 | return tag_len; |
| 1488 | } |
| 1489 | |
| 1490 | /** |
| 1491 | * cipso_v4_parsetag_rng - Parse a CIPSO ranged tag |
| 1492 | * @doi_def: the DOI definition |
| 1493 | * @tag: the CIPSO tag |
| 1494 | * @secattr: the security attributes |
| 1495 | * |
| 1496 | * Description: |
| 1497 | * Parse a CIPSO ranged tag (tag type #5) and return the security attributes |
| 1498 | * in @secattr. Return zero on success, negatives values on failure. |
| 1499 | * |
| 1500 | */ |
| 1501 | static int cipso_v4_parsetag_rng(const struct cipso_v4_doi *doi_def, |
| 1502 | const unsigned char *tag, |
| 1503 | struct netlbl_lsm_secattr *secattr) |
| 1504 | { |
| 1505 | int ret_val; |
| 1506 | u8 tag_len = tag[1]; |
| 1507 | u32 level; |
| 1508 | |
| 1509 | ret_val = cipso_v4_map_lvl_ntoh(doi_def, tag[3], &level); |
| 1510 | if (ret_val != 0) |
| 1511 | return ret_val; |
Paul Moore | 16efd45 | 2008-01-29 08:37:59 -0500 | [diff] [blame] | 1512 | secattr->attr.mls.lvl = level; |
Paul Moore | 484b366 | 2006-11-29 13:18:20 -0500 | [diff] [blame] | 1513 | secattr->flags |= NETLBL_SECATTR_MLS_LVL; |
| 1514 | |
| 1515 | if (tag_len > 4) { |
Paul Moore | 484b366 | 2006-11-29 13:18:20 -0500 | [diff] [blame] | 1516 | ret_val = cipso_v4_map_cat_rng_ntoh(doi_def, |
| 1517 | &tag[4], |
| 1518 | tag_len - 4, |
| 1519 | secattr); |
| 1520 | if (ret_val != 0) { |
Paul Moore | 4fbe63d | 2014-08-01 11:17:37 -0400 | [diff] [blame] | 1521 | netlbl_catmap_free(secattr->attr.mls.cat); |
Paul Moore | 484b366 | 2006-11-29 13:18:20 -0500 | [diff] [blame] | 1522 | return ret_val; |
| 1523 | } |
| 1524 | |
| 1525 | secattr->flags |= NETLBL_SECATTR_MLS_CAT; |
| 1526 | } |
| 1527 | |
| 1528 | return 0; |
| 1529 | } |
| 1530 | |
| 1531 | /** |
Paul Moore | 15c45f7 | 2008-10-10 10:16:34 -0400 | [diff] [blame] | 1532 | * cipso_v4_gentag_loc - Generate a CIPSO local tag (non-standard) |
| 1533 | * @doi_def: the DOI definition |
| 1534 | * @secattr: the security attributes |
| 1535 | * @buffer: the option buffer |
| 1536 | * @buffer_len: length of buffer in bytes |
| 1537 | * |
| 1538 | * Description: |
| 1539 | * Generate a CIPSO option using the local tag. Returns the size of the tag |
| 1540 | * on success, negative values on failure. |
| 1541 | * |
| 1542 | */ |
| 1543 | static int cipso_v4_gentag_loc(const struct cipso_v4_doi *doi_def, |
| 1544 | const struct netlbl_lsm_secattr *secattr, |
| 1545 | unsigned char *buffer, |
| 1546 | u32 buffer_len) |
| 1547 | { |
| 1548 | if (!(secattr->flags & NETLBL_SECATTR_SECID)) |
| 1549 | return -EPERM; |
| 1550 | |
| 1551 | buffer[0] = CIPSO_V4_TAG_LOCAL; |
| 1552 | buffer[1] = CIPSO_V4_TAG_LOC_BLEN; |
| 1553 | *(u32 *)&buffer[2] = secattr->attr.secid; |
| 1554 | |
| 1555 | return CIPSO_V4_TAG_LOC_BLEN; |
| 1556 | } |
| 1557 | |
| 1558 | /** |
| 1559 | * cipso_v4_parsetag_loc - Parse a CIPSO local tag |
| 1560 | * @doi_def: the DOI definition |
| 1561 | * @tag: the CIPSO tag |
| 1562 | * @secattr: the security attributes |
| 1563 | * |
| 1564 | * Description: |
| 1565 | * Parse a CIPSO local tag and return the security attributes in @secattr. |
| 1566 | * Return zero on success, negatives values on failure. |
| 1567 | * |
| 1568 | */ |
| 1569 | static int cipso_v4_parsetag_loc(const struct cipso_v4_doi *doi_def, |
| 1570 | const unsigned char *tag, |
| 1571 | struct netlbl_lsm_secattr *secattr) |
| 1572 | { |
| 1573 | secattr->attr.secid = *(u32 *)&tag[2]; |
| 1574 | secattr->flags |= NETLBL_SECATTR_SECID; |
| 1575 | |
| 1576 | return 0; |
| 1577 | } |
| 1578 | |
| 1579 | /** |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1580 | * cipso_v4_validate - Validate a CIPSO option |
| 1581 | * @option: the start of the option, on error it is set to point to the error |
| 1582 | * |
| 1583 | * Description: |
| 1584 | * This routine is called to validate a CIPSO option, it checks all of the |
| 1585 | * fields to ensure that they are at least valid, see the draft snippet below |
| 1586 | * for details. If the option is valid then a zero value is returned and |
| 1587 | * the value of @option is unchanged. If the option is invalid then a |
| 1588 | * non-zero value is returned and @option is adjusted to point to the |
| 1589 | * offending portion of the option. From the IETF draft ... |
| 1590 | * |
| 1591 | * "If any field within the CIPSO options, such as the DOI identifier, is not |
| 1592 | * recognized the IP datagram is discarded and an ICMP 'parameter problem' |
| 1593 | * (type 12) is generated and returned. The ICMP code field is set to 'bad |
| 1594 | * parameter' (code 0) and the pointer is set to the start of the CIPSO field |
| 1595 | * that is unrecognized." |
| 1596 | * |
| 1597 | */ |
Paul Moore | 15c45f7 | 2008-10-10 10:16:34 -0400 | [diff] [blame] | 1598 | int cipso_v4_validate(const struct sk_buff *skb, unsigned char **option) |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1599 | { |
| 1600 | unsigned char *opt = *option; |
| 1601 | unsigned char *tag; |
| 1602 | unsigned char opt_iter; |
| 1603 | unsigned char err_offset = 0; |
| 1604 | u8 opt_len; |
| 1605 | u8 tag_len; |
| 1606 | struct cipso_v4_doi *doi_def = NULL; |
| 1607 | u32 tag_iter; |
| 1608 | |
| 1609 | /* caller already checks for length values that are too large */ |
| 1610 | opt_len = opt[1]; |
| 1611 | if (opt_len < 8) { |
| 1612 | err_offset = 1; |
| 1613 | goto validate_return; |
| 1614 | } |
| 1615 | |
| 1616 | rcu_read_lock(); |
Harvey Harrison | d3e2ce3 | 2008-05-02 16:26:16 -0700 | [diff] [blame] | 1617 | doi_def = cipso_v4_doi_search(get_unaligned_be32(&opt[2])); |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1618 | if (doi_def == NULL) { |
| 1619 | err_offset = 2; |
| 1620 | goto validate_return_locked; |
| 1621 | } |
| 1622 | |
Paul Moore | 15c45f7 | 2008-10-10 10:16:34 -0400 | [diff] [blame] | 1623 | opt_iter = CIPSO_V4_HDR_LEN; |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1624 | tag = opt + opt_iter; |
| 1625 | while (opt_iter < opt_len) { |
| 1626 | for (tag_iter = 0; doi_def->tags[tag_iter] != tag[0];) |
| 1627 | if (doi_def->tags[tag_iter] == CIPSO_V4_TAG_INVALID || |
| 1628 | ++tag_iter == CIPSO_V4_TAG_MAXCNT) { |
| 1629 | err_offset = opt_iter; |
| 1630 | goto validate_return_locked; |
| 1631 | } |
| 1632 | |
| 1633 | tag_len = tag[1]; |
| 1634 | if (tag_len > (opt_len - opt_iter)) { |
| 1635 | err_offset = opt_iter + 1; |
| 1636 | goto validate_return_locked; |
| 1637 | } |
| 1638 | |
| 1639 | switch (tag[0]) { |
| 1640 | case CIPSO_V4_TAG_RBITMAP: |
Paul Moore | 15c45f7 | 2008-10-10 10:16:34 -0400 | [diff] [blame] | 1641 | if (tag_len < CIPSO_V4_TAG_RBM_BLEN) { |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1642 | err_offset = opt_iter + 1; |
| 1643 | goto validate_return_locked; |
| 1644 | } |
| 1645 | |
| 1646 | /* We are already going to do all the verification |
| 1647 | * necessary at the socket layer so from our point of |
| 1648 | * view it is safe to turn these checks off (and less |
| 1649 | * work), however, the CIPSO draft says we should do |
| 1650 | * all the CIPSO validations here but it doesn't |
| 1651 | * really specify _exactly_ what we need to validate |
| 1652 | * ... so, just make it a sysctl tunable. */ |
| 1653 | if (cipso_v4_rbm_strictvalid) { |
| 1654 | if (cipso_v4_map_lvl_valid(doi_def, |
| 1655 | tag[3]) < 0) { |
| 1656 | err_offset = opt_iter + 3; |
| 1657 | goto validate_return_locked; |
| 1658 | } |
Paul Moore | 15c45f7 | 2008-10-10 10:16:34 -0400 | [diff] [blame] | 1659 | if (tag_len > CIPSO_V4_TAG_RBM_BLEN && |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1660 | cipso_v4_map_cat_rbm_valid(doi_def, |
| 1661 | &tag[4], |
| 1662 | tag_len - 4) < 0) { |
| 1663 | err_offset = opt_iter + 4; |
| 1664 | goto validate_return_locked; |
| 1665 | } |
| 1666 | } |
| 1667 | break; |
Paul Moore | 654bbc2 | 2006-11-29 13:18:19 -0500 | [diff] [blame] | 1668 | case CIPSO_V4_TAG_ENUM: |
Paul Moore | 15c45f7 | 2008-10-10 10:16:34 -0400 | [diff] [blame] | 1669 | if (tag_len < CIPSO_V4_TAG_ENUM_BLEN) { |
Paul Moore | 654bbc2 | 2006-11-29 13:18:19 -0500 | [diff] [blame] | 1670 | err_offset = opt_iter + 1; |
| 1671 | goto validate_return_locked; |
| 1672 | } |
| 1673 | |
| 1674 | if (cipso_v4_map_lvl_valid(doi_def, |
| 1675 | tag[3]) < 0) { |
| 1676 | err_offset = opt_iter + 3; |
| 1677 | goto validate_return_locked; |
| 1678 | } |
Paul Moore | 15c45f7 | 2008-10-10 10:16:34 -0400 | [diff] [blame] | 1679 | if (tag_len > CIPSO_V4_TAG_ENUM_BLEN && |
Paul Moore | 654bbc2 | 2006-11-29 13:18:19 -0500 | [diff] [blame] | 1680 | cipso_v4_map_cat_enum_valid(doi_def, |
| 1681 | &tag[4], |
| 1682 | tag_len - 4) < 0) { |
| 1683 | err_offset = opt_iter + 4; |
| 1684 | goto validate_return_locked; |
| 1685 | } |
| 1686 | break; |
Paul Moore | 484b366 | 2006-11-29 13:18:20 -0500 | [diff] [blame] | 1687 | case CIPSO_V4_TAG_RANGE: |
Paul Moore | 15c45f7 | 2008-10-10 10:16:34 -0400 | [diff] [blame] | 1688 | if (tag_len < CIPSO_V4_TAG_RNG_BLEN) { |
Paul Moore | 484b366 | 2006-11-29 13:18:20 -0500 | [diff] [blame] | 1689 | err_offset = opt_iter + 1; |
| 1690 | goto validate_return_locked; |
| 1691 | } |
| 1692 | |
| 1693 | if (cipso_v4_map_lvl_valid(doi_def, |
| 1694 | tag[3]) < 0) { |
| 1695 | err_offset = opt_iter + 3; |
| 1696 | goto validate_return_locked; |
| 1697 | } |
Paul Moore | 15c45f7 | 2008-10-10 10:16:34 -0400 | [diff] [blame] | 1698 | if (tag_len > CIPSO_V4_TAG_RNG_BLEN && |
Paul Moore | 484b366 | 2006-11-29 13:18:20 -0500 | [diff] [blame] | 1699 | cipso_v4_map_cat_rng_valid(doi_def, |
| 1700 | &tag[4], |
| 1701 | tag_len - 4) < 0) { |
| 1702 | err_offset = opt_iter + 4; |
| 1703 | goto validate_return_locked; |
| 1704 | } |
| 1705 | break; |
Paul Moore | 15c45f7 | 2008-10-10 10:16:34 -0400 | [diff] [blame] | 1706 | case CIPSO_V4_TAG_LOCAL: |
| 1707 | /* This is a non-standard tag that we only allow for |
| 1708 | * local connections, so if the incoming interface is |
Paul Moore | 89d7ae3 | 2012-07-17 11:07:47 +0000 | [diff] [blame] | 1709 | * not the loopback device drop the packet. Further, |
| 1710 | * there is no legitimate reason for setting this from |
| 1711 | * userspace so reject it if skb is NULL. */ |
| 1712 | if (skb == NULL || !(skb->dev->flags & IFF_LOOPBACK)) { |
Paul Moore | 15c45f7 | 2008-10-10 10:16:34 -0400 | [diff] [blame] | 1713 | err_offset = opt_iter; |
| 1714 | goto validate_return_locked; |
| 1715 | } |
| 1716 | if (tag_len != CIPSO_V4_TAG_LOC_BLEN) { |
| 1717 | err_offset = opt_iter + 1; |
| 1718 | goto validate_return_locked; |
| 1719 | } |
| 1720 | break; |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1721 | default: |
| 1722 | err_offset = opt_iter; |
| 1723 | goto validate_return_locked; |
| 1724 | } |
| 1725 | |
| 1726 | tag += tag_len; |
| 1727 | opt_iter += tag_len; |
| 1728 | } |
| 1729 | |
| 1730 | validate_return_locked: |
| 1731 | rcu_read_unlock(); |
| 1732 | validate_return: |
| 1733 | *option = opt + err_offset; |
| 1734 | return err_offset; |
| 1735 | } |
| 1736 | |
| 1737 | /** |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1738 | * cipso_v4_error - Send the correct response for a bad packet |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1739 | * @skb: the packet |
| 1740 | * @error: the error code |
| 1741 | * @gateway: CIPSO gateway flag |
| 1742 | * |
| 1743 | * Description: |
| 1744 | * Based on the error code given in @error, send an ICMP error message back to |
| 1745 | * the originating host. From the IETF draft ... |
| 1746 | * |
| 1747 | * "If the contents of the CIPSO [option] are valid but the security label is |
| 1748 | * outside of the configured host or port label range, the datagram is |
| 1749 | * discarded and an ICMP 'destination unreachable' (type 3) is generated and |
| 1750 | * returned. The code field of the ICMP is set to 'communication with |
| 1751 | * destination network administratively prohibited' (code 9) or to |
| 1752 | * 'communication with destination host administratively prohibited' |
| 1753 | * (code 10). The value of the code is dependent on whether the originator |
| 1754 | * of the ICMP message is acting as a CIPSO host or a CIPSO gateway. The |
| 1755 | * recipient of the ICMP message MUST be able to handle either value. The |
| 1756 | * same procedure is performed if a CIPSO [option] can not be added to an |
| 1757 | * IP packet because it is too large to fit in the IP options area." |
| 1758 | * |
| 1759 | * "If the error is triggered by receipt of an ICMP message, the message is |
| 1760 | * discarded and no response is permitted (consistent with general ICMP |
| 1761 | * processing rules)." |
| 1762 | * |
| 1763 | */ |
| 1764 | void cipso_v4_error(struct sk_buff *skb, int error, u32 gateway) |
| 1765 | { |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1766 | if (ip_hdr(skb)->protocol == IPPROTO_ICMP || error != -EACCES) |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1767 | return; |
| 1768 | |
| 1769 | if (gateway) |
| 1770 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_NET_ANO, 0); |
| 1771 | else |
| 1772 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_ANO, 0); |
| 1773 | } |
| 1774 | |
| 1775 | /** |
Paul Moore | 948bf85 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 1776 | * cipso_v4_genopt - Generate a CIPSO option |
| 1777 | * @buf: the option buffer |
| 1778 | * @buf_len: the size of opt_buf |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1779 | * @doi_def: the CIPSO DOI to use |
Paul Moore | 948bf85 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 1780 | * @secattr: the security attributes |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1781 | * |
| 1782 | * Description: |
Paul Moore | 948bf85 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 1783 | * Generate a CIPSO option using the DOI definition and security attributes |
| 1784 | * passed to the function. Returns the length of the option on success and |
| 1785 | * negative values on failure. |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1786 | * |
| 1787 | */ |
Paul Moore | 948bf85 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 1788 | static int cipso_v4_genopt(unsigned char *buf, u32 buf_len, |
| 1789 | const struct cipso_v4_doi *doi_def, |
| 1790 | const struct netlbl_lsm_secattr *secattr) |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1791 | { |
Paul Moore | 948bf85 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 1792 | int ret_val; |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1793 | u32 iter; |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1794 | |
Paul Moore | 948bf85 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 1795 | if (buf_len <= CIPSO_V4_HDR_LEN) |
| 1796 | return -ENOSPC; |
Paul Moore | 91b1ed0 | 2006-11-17 17:38:49 -0500 | [diff] [blame] | 1797 | |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1798 | /* XXX - This code assumes only one tag per CIPSO option which isn't |
| 1799 | * really a good assumption to make but since we only support the MAC |
| 1800 | * tags right now it is a safe assumption. */ |
| 1801 | iter = 0; |
| 1802 | do { |
Paul Moore | 91b1ed0 | 2006-11-17 17:38:49 -0500 | [diff] [blame] | 1803 | memset(buf, 0, buf_len); |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1804 | switch (doi_def->tags[iter]) { |
| 1805 | case CIPSO_V4_TAG_RBITMAP: |
| 1806 | ret_val = cipso_v4_gentag_rbm(doi_def, |
Paul Moore | 91b1ed0 | 2006-11-17 17:38:49 -0500 | [diff] [blame] | 1807 | secattr, |
| 1808 | &buf[CIPSO_V4_HDR_LEN], |
| 1809 | buf_len - CIPSO_V4_HDR_LEN); |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1810 | break; |
Paul Moore | 654bbc2 | 2006-11-29 13:18:19 -0500 | [diff] [blame] | 1811 | case CIPSO_V4_TAG_ENUM: |
| 1812 | ret_val = cipso_v4_gentag_enum(doi_def, |
| 1813 | secattr, |
| 1814 | &buf[CIPSO_V4_HDR_LEN], |
| 1815 | buf_len - CIPSO_V4_HDR_LEN); |
| 1816 | break; |
Paul Moore | 484b366 | 2006-11-29 13:18:20 -0500 | [diff] [blame] | 1817 | case CIPSO_V4_TAG_RANGE: |
| 1818 | ret_val = cipso_v4_gentag_rng(doi_def, |
| 1819 | secattr, |
| 1820 | &buf[CIPSO_V4_HDR_LEN], |
| 1821 | buf_len - CIPSO_V4_HDR_LEN); |
| 1822 | break; |
Paul Moore | 15c45f7 | 2008-10-10 10:16:34 -0400 | [diff] [blame] | 1823 | case CIPSO_V4_TAG_LOCAL: |
| 1824 | ret_val = cipso_v4_gentag_loc(doi_def, |
| 1825 | secattr, |
| 1826 | &buf[CIPSO_V4_HDR_LEN], |
| 1827 | buf_len - CIPSO_V4_HDR_LEN); |
| 1828 | break; |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1829 | default: |
Paul Moore | 948bf85 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 1830 | return -EPERM; |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1831 | } |
| 1832 | |
| 1833 | iter++; |
Paul Moore | 91b1ed0 | 2006-11-17 17:38:49 -0500 | [diff] [blame] | 1834 | } while (ret_val < 0 && |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1835 | iter < CIPSO_V4_TAG_MAXCNT && |
| 1836 | doi_def->tags[iter] != CIPSO_V4_TAG_INVALID); |
Paul Moore | 91b1ed0 | 2006-11-17 17:38:49 -0500 | [diff] [blame] | 1837 | if (ret_val < 0) |
Paul Moore | 948bf85 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 1838 | return ret_val; |
Paul Moore | 91b1ed0 | 2006-11-17 17:38:49 -0500 | [diff] [blame] | 1839 | cipso_v4_gentag_hdr(doi_def, buf, ret_val); |
Paul Moore | 948bf85 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 1840 | return CIPSO_V4_HDR_LEN + ret_val; |
| 1841 | } |
| 1842 | |
| 1843 | /** |
| 1844 | * cipso_v4_sock_setattr - Add a CIPSO option to a socket |
| 1845 | * @sk: the socket |
| 1846 | * @doi_def: the CIPSO DOI to use |
| 1847 | * @secattr: the specific security attributes of the socket |
| 1848 | * |
| 1849 | * Description: |
| 1850 | * Set the CIPSO option on the given socket using the DOI definition and |
| 1851 | * security attributes passed to the function. This function requires |
| 1852 | * exclusive access to @sk, which means it either needs to be in the |
| 1853 | * process of being created or locked. Returns zero on success and negative |
| 1854 | * values on failure. |
| 1855 | * |
| 1856 | */ |
| 1857 | int cipso_v4_sock_setattr(struct sock *sk, |
| 1858 | const struct cipso_v4_doi *doi_def, |
| 1859 | const struct netlbl_lsm_secattr *secattr) |
| 1860 | { |
| 1861 | int ret_val = -EPERM; |
| 1862 | unsigned char *buf = NULL; |
| 1863 | u32 buf_len; |
| 1864 | u32 opt_len; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 1865 | struct ip_options_rcu *old, *opt = NULL; |
Paul Moore | 948bf85 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 1866 | struct inet_sock *sk_inet; |
| 1867 | struct inet_connection_sock *sk_conn; |
| 1868 | |
| 1869 | /* In the case of sock_create_lite(), the sock->sk field is not |
| 1870 | * defined yet but it is not a problem as the only users of these |
| 1871 | * "lite" PF_INET sockets are functions which do an accept() call |
| 1872 | * afterwards so we will label the socket as part of the accept(). */ |
| 1873 | if (sk == NULL) |
| 1874 | return 0; |
| 1875 | |
| 1876 | /* We allocate the maximum CIPSO option size here so we are probably |
| 1877 | * being a little wasteful, but it makes our life _much_ easier later |
| 1878 | * on and after all we are only talking about 40 bytes. */ |
| 1879 | buf_len = CIPSO_V4_OPT_LEN_MAX; |
| 1880 | buf = kmalloc(buf_len, GFP_ATOMIC); |
| 1881 | if (buf == NULL) { |
| 1882 | ret_val = -ENOMEM; |
| 1883 | goto socket_setattr_failure; |
| 1884 | } |
| 1885 | |
| 1886 | ret_val = cipso_v4_genopt(buf, buf_len, doi_def, secattr); |
| 1887 | if (ret_val < 0) |
| 1888 | goto socket_setattr_failure; |
| 1889 | buf_len = ret_val; |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1890 | |
| 1891 | /* We can't use ip_options_get() directly because it makes a call to |
| 1892 | * ip_options_get_alloc() which allocates memory with GFP_KERNEL and |
Paul Moore | f8687af | 2006-10-30 15:22:15 -0800 | [diff] [blame] | 1893 | * we won't always have CAP_NET_RAW even though we _always_ want to |
| 1894 | * set the IPOPT_CIPSO option. */ |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1895 | opt_len = (buf_len + 3) & ~3; |
| 1896 | opt = kzalloc(sizeof(*opt) + opt_len, GFP_ATOMIC); |
| 1897 | if (opt == NULL) { |
| 1898 | ret_val = -ENOMEM; |
| 1899 | goto socket_setattr_failure; |
| 1900 | } |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 1901 | memcpy(opt->opt.__data, buf, buf_len); |
| 1902 | opt->opt.optlen = opt_len; |
| 1903 | opt->opt.cipso = sizeof(struct iphdr); |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1904 | kfree(buf); |
| 1905 | buf = NULL; |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1906 | |
| 1907 | sk_inet = inet_sk(sk); |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 1908 | |
| 1909 | old = rcu_dereference_protected(sk_inet->inet_opt, sock_owned_by_user(sk)); |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1910 | if (sk_inet->is_icsk) { |
| 1911 | sk_conn = inet_csk(sk); |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 1912 | if (old) |
| 1913 | sk_conn->icsk_ext_hdr_len -= old->opt.optlen; |
| 1914 | sk_conn->icsk_ext_hdr_len += opt->opt.optlen; |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1915 | sk_conn->icsk_sync_mss(sk, sk_conn->icsk_pmtu_cookie); |
| 1916 | } |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 1917 | rcu_assign_pointer(sk_inet->inet_opt, opt); |
| 1918 | if (old) |
Paul E. McKenney | 4f9c8c1 | 2012-01-06 17:06:11 -0800 | [diff] [blame] | 1919 | kfree_rcu(old, rcu); |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 1920 | |
| 1921 | return 0; |
| 1922 | |
| 1923 | socket_setattr_failure: |
| 1924 | kfree(buf); |
| 1925 | kfree(opt); |
| 1926 | return ret_val; |
| 1927 | } |
| 1928 | |
| 1929 | /** |
Paul Moore | 389fb800 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 1930 | * cipso_v4_req_setattr - Add a CIPSO option to a connection request socket |
| 1931 | * @req: the connection request socket |
| 1932 | * @doi_def: the CIPSO DOI to use |
| 1933 | * @secattr: the specific security attributes of the socket |
Paul Moore | 014ab19 | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 1934 | * |
| 1935 | * Description: |
Paul Moore | 389fb800 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 1936 | * Set the CIPSO option on the given socket using the DOI definition and |
| 1937 | * security attributes passed to the function. Returns zero on success and |
| 1938 | * negative values on failure. |
Paul Moore | 014ab19 | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 1939 | * |
| 1940 | */ |
Paul Moore | 389fb800 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 1941 | int cipso_v4_req_setattr(struct request_sock *req, |
| 1942 | const struct cipso_v4_doi *doi_def, |
| 1943 | const struct netlbl_lsm_secattr *secattr) |
Paul Moore | 014ab19 | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 1944 | { |
Paul Moore | 389fb800 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 1945 | int ret_val = -EPERM; |
| 1946 | unsigned char *buf = NULL; |
| 1947 | u32 buf_len; |
| 1948 | u32 opt_len; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 1949 | struct ip_options_rcu *opt = NULL; |
Paul Moore | 389fb800 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 1950 | struct inet_request_sock *req_inet; |
Paul Moore | 014ab19 | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 1951 | |
Paul Moore | 389fb800 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 1952 | /* We allocate the maximum CIPSO option size here so we are probably |
| 1953 | * being a little wasteful, but it makes our life _much_ easier later |
| 1954 | * on and after all we are only talking about 40 bytes. */ |
| 1955 | buf_len = CIPSO_V4_OPT_LEN_MAX; |
| 1956 | buf = kmalloc(buf_len, GFP_ATOMIC); |
| 1957 | if (buf == NULL) { |
| 1958 | ret_val = -ENOMEM; |
| 1959 | goto req_setattr_failure; |
| 1960 | } |
| 1961 | |
| 1962 | ret_val = cipso_v4_genopt(buf, buf_len, doi_def, secattr); |
| 1963 | if (ret_val < 0) |
| 1964 | goto req_setattr_failure; |
| 1965 | buf_len = ret_val; |
| 1966 | |
| 1967 | /* We can't use ip_options_get() directly because it makes a call to |
| 1968 | * ip_options_get_alloc() which allocates memory with GFP_KERNEL and |
| 1969 | * we won't always have CAP_NET_RAW even though we _always_ want to |
| 1970 | * set the IPOPT_CIPSO option. */ |
| 1971 | opt_len = (buf_len + 3) & ~3; |
| 1972 | opt = kzalloc(sizeof(*opt) + opt_len, GFP_ATOMIC); |
| 1973 | if (opt == NULL) { |
| 1974 | ret_val = -ENOMEM; |
| 1975 | goto req_setattr_failure; |
| 1976 | } |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 1977 | memcpy(opt->opt.__data, buf, buf_len); |
| 1978 | opt->opt.optlen = opt_len; |
| 1979 | opt->opt.cipso = sizeof(struct iphdr); |
Paul Moore | 389fb800 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 1980 | kfree(buf); |
| 1981 | buf = NULL; |
| 1982 | |
| 1983 | req_inet = inet_rsk(req); |
| 1984 | opt = xchg(&req_inet->opt, opt); |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 1985 | if (opt) |
Paul E. McKenney | 4f9c8c1 | 2012-01-06 17:06:11 -0800 | [diff] [blame] | 1986 | kfree_rcu(opt, rcu); |
Paul Moore | 389fb800 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 1987 | |
| 1988 | return 0; |
| 1989 | |
| 1990 | req_setattr_failure: |
| 1991 | kfree(buf); |
| 1992 | kfree(opt); |
| 1993 | return ret_val; |
| 1994 | } |
| 1995 | |
| 1996 | /** |
| 1997 | * cipso_v4_delopt - Delete the CIPSO option from a set of IP options |
| 1998 | * @opt_ptr: IP option pointer |
| 1999 | * |
| 2000 | * Description: |
| 2001 | * Deletes the CIPSO IP option from a set of IP options and makes the necessary |
| 2002 | * adjustments to the IP option structure. Returns zero on success, negative |
| 2003 | * values on failure. |
| 2004 | * |
| 2005 | */ |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 2006 | static int cipso_v4_delopt(struct ip_options_rcu **opt_ptr) |
Paul Moore | 389fb800 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 2007 | { |
| 2008 | int hdr_delta = 0; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 2009 | struct ip_options_rcu *opt = *opt_ptr; |
Paul Moore | 014ab19 | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 2010 | |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 2011 | if (opt->opt.srr || opt->opt.rr || opt->opt.ts || opt->opt.router_alert) { |
Paul Moore | 014ab19 | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 2012 | u8 cipso_len; |
| 2013 | u8 cipso_off; |
| 2014 | unsigned char *cipso_ptr; |
| 2015 | int iter; |
| 2016 | int optlen_new; |
| 2017 | |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 2018 | cipso_off = opt->opt.cipso - sizeof(struct iphdr); |
| 2019 | cipso_ptr = &opt->opt.__data[cipso_off]; |
Paul Moore | 014ab19 | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 2020 | cipso_len = cipso_ptr[1]; |
| 2021 | |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 2022 | if (opt->opt.srr > opt->opt.cipso) |
| 2023 | opt->opt.srr -= cipso_len; |
| 2024 | if (opt->opt.rr > opt->opt.cipso) |
| 2025 | opt->opt.rr -= cipso_len; |
| 2026 | if (opt->opt.ts > opt->opt.cipso) |
| 2027 | opt->opt.ts -= cipso_len; |
| 2028 | if (opt->opt.router_alert > opt->opt.cipso) |
| 2029 | opt->opt.router_alert -= cipso_len; |
| 2030 | opt->opt.cipso = 0; |
Paul Moore | 014ab19 | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 2031 | |
| 2032 | memmove(cipso_ptr, cipso_ptr + cipso_len, |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 2033 | opt->opt.optlen - cipso_off - cipso_len); |
Paul Moore | 014ab19 | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 2034 | |
| 2035 | /* determining the new total option length is tricky because of |
| 2036 | * the padding necessary, the only thing i can think to do at |
| 2037 | * this point is walk the options one-by-one, skipping the |
| 2038 | * padding at the end to determine the actual option size and |
| 2039 | * from there we can determine the new total option length */ |
| 2040 | iter = 0; |
| 2041 | optlen_new = 0; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 2042 | while (iter < opt->opt.optlen) |
| 2043 | if (opt->opt.__data[iter] != IPOPT_NOP) { |
| 2044 | iter += opt->opt.__data[iter + 1]; |
Paul Moore | 014ab19 | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 2045 | optlen_new = iter; |
| 2046 | } else |
| 2047 | iter++; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 2048 | hdr_delta = opt->opt.optlen; |
| 2049 | opt->opt.optlen = (optlen_new + 3) & ~3; |
| 2050 | hdr_delta -= opt->opt.optlen; |
Paul Moore | 014ab19 | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 2051 | } else { |
| 2052 | /* only the cipso option was present on the socket so we can |
| 2053 | * remove the entire option struct */ |
Paul Moore | 389fb800 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 2054 | *opt_ptr = NULL; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 2055 | hdr_delta = opt->opt.optlen; |
Paul E. McKenney | 4f9c8c1 | 2012-01-06 17:06:11 -0800 | [diff] [blame] | 2056 | kfree_rcu(opt, rcu); |
Paul Moore | 014ab19 | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 2057 | } |
| 2058 | |
Paul Moore | 389fb800 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 2059 | return hdr_delta; |
| 2060 | } |
| 2061 | |
| 2062 | /** |
| 2063 | * cipso_v4_sock_delattr - Delete the CIPSO option from a socket |
| 2064 | * @sk: the socket |
| 2065 | * |
| 2066 | * Description: |
| 2067 | * Removes the CIPSO option from a socket, if present. |
| 2068 | * |
| 2069 | */ |
| 2070 | void cipso_v4_sock_delattr(struct sock *sk) |
| 2071 | { |
| 2072 | int hdr_delta; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 2073 | struct ip_options_rcu *opt; |
Paul Moore | 389fb800 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 2074 | struct inet_sock *sk_inet; |
| 2075 | |
| 2076 | sk_inet = inet_sk(sk); |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 2077 | opt = rcu_dereference_protected(sk_inet->inet_opt, 1); |
| 2078 | if (opt == NULL || opt->opt.cipso == 0) |
Paul Moore | 389fb800 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 2079 | return; |
| 2080 | |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 2081 | hdr_delta = cipso_v4_delopt(&sk_inet->inet_opt); |
Paul Moore | 014ab19 | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 2082 | if (sk_inet->is_icsk && hdr_delta > 0) { |
| 2083 | struct inet_connection_sock *sk_conn = inet_csk(sk); |
| 2084 | sk_conn->icsk_ext_hdr_len -= hdr_delta; |
| 2085 | sk_conn->icsk_sync_mss(sk, sk_conn->icsk_pmtu_cookie); |
| 2086 | } |
| 2087 | } |
| 2088 | |
| 2089 | /** |
Paul Moore | 389fb800 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 2090 | * cipso_v4_req_delattr - Delete the CIPSO option from a request socket |
| 2091 | * @reg: the request socket |
| 2092 | * |
| 2093 | * Description: |
| 2094 | * Removes the CIPSO option from a request socket, if present. |
| 2095 | * |
| 2096 | */ |
| 2097 | void cipso_v4_req_delattr(struct request_sock *req) |
| 2098 | { |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 2099 | struct ip_options_rcu *opt; |
Paul Moore | 389fb800 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 2100 | struct inet_request_sock *req_inet; |
| 2101 | |
| 2102 | req_inet = inet_rsk(req); |
| 2103 | opt = req_inet->opt; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 2104 | if (opt == NULL || opt->opt.cipso == 0) |
Paul Moore | 389fb800 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 2105 | return; |
| 2106 | |
| 2107 | cipso_v4_delopt(&req_inet->opt); |
| 2108 | } |
| 2109 | |
| 2110 | /** |
Paul Moore | 63d804ea | 2007-09-15 21:45:13 -0700 | [diff] [blame] | 2111 | * cipso_v4_getattr - Helper function for the cipso_v4_*_getattr functions |
| 2112 | * @cipso: the CIPSO v4 option |
| 2113 | * @secattr: the security attributes |
| 2114 | * |
| 2115 | * Description: |
| 2116 | * Inspect @cipso and return the security attributes in @secattr. Returns zero |
| 2117 | * on success and negative values on failure. |
| 2118 | * |
| 2119 | */ |
| 2120 | static int cipso_v4_getattr(const unsigned char *cipso, |
| 2121 | struct netlbl_lsm_secattr *secattr) |
| 2122 | { |
| 2123 | int ret_val = -ENOMSG; |
| 2124 | u32 doi; |
| 2125 | struct cipso_v4_doi *doi_def; |
| 2126 | |
| 2127 | if (cipso_v4_cache_check(cipso, cipso[1], secattr) == 0) |
| 2128 | return 0; |
| 2129 | |
Harvey Harrison | d3e2ce3 | 2008-05-02 16:26:16 -0700 | [diff] [blame] | 2130 | doi = get_unaligned_be32(&cipso[2]); |
Paul Moore | 63d804ea | 2007-09-15 21:45:13 -0700 | [diff] [blame] | 2131 | rcu_read_lock(); |
| 2132 | doi_def = cipso_v4_doi_search(doi); |
| 2133 | if (doi_def == NULL) |
| 2134 | goto getattr_return; |
| 2135 | /* XXX - This code assumes only one tag per CIPSO option which isn't |
| 2136 | * really a good assumption to make but since we only support the MAC |
| 2137 | * tags right now it is a safe assumption. */ |
| 2138 | switch (cipso[6]) { |
| 2139 | case CIPSO_V4_TAG_RBITMAP: |
| 2140 | ret_val = cipso_v4_parsetag_rbm(doi_def, &cipso[6], secattr); |
| 2141 | break; |
| 2142 | case CIPSO_V4_TAG_ENUM: |
| 2143 | ret_val = cipso_v4_parsetag_enum(doi_def, &cipso[6], secattr); |
| 2144 | break; |
| 2145 | case CIPSO_V4_TAG_RANGE: |
| 2146 | ret_val = cipso_v4_parsetag_rng(doi_def, &cipso[6], secattr); |
| 2147 | break; |
Paul Moore | 15c45f7 | 2008-10-10 10:16:34 -0400 | [diff] [blame] | 2148 | case CIPSO_V4_TAG_LOCAL: |
| 2149 | ret_val = cipso_v4_parsetag_loc(doi_def, &cipso[6], secattr); |
| 2150 | break; |
Paul Moore | 63d804ea | 2007-09-15 21:45:13 -0700 | [diff] [blame] | 2151 | } |
Paul Moore | 16efd45 | 2008-01-29 08:37:59 -0500 | [diff] [blame] | 2152 | if (ret_val == 0) |
| 2153 | secattr->type = NETLBL_NLTYPE_CIPSOV4; |
Paul Moore | 63d804ea | 2007-09-15 21:45:13 -0700 | [diff] [blame] | 2154 | |
| 2155 | getattr_return: |
| 2156 | rcu_read_unlock(); |
| 2157 | return ret_val; |
| 2158 | } |
| 2159 | |
| 2160 | /** |
Paul Moore | 14a72f5 | 2006-09-25 15:52:01 -0700 | [diff] [blame] | 2161 | * cipso_v4_sock_getattr - Get the security attributes from a sock |
| 2162 | * @sk: the sock |
| 2163 | * @secattr: the security attributes |
| 2164 | * |
| 2165 | * Description: |
| 2166 | * Query @sk to see if there is a CIPSO option attached to the sock and if |
| 2167 | * there is return the CIPSO security attributes in @secattr. This function |
| 2168 | * requires that @sk be locked, or privately held, but it does not do any |
| 2169 | * locking itself. Returns zero on success and negative values on failure. |
| 2170 | * |
| 2171 | */ |
| 2172 | int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr) |
| 2173 | { |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 2174 | struct ip_options_rcu *opt; |
| 2175 | int res = -ENOMSG; |
Paul Moore | 14a72f5 | 2006-09-25 15:52:01 -0700 | [diff] [blame] | 2176 | |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 2177 | rcu_read_lock(); |
| 2178 | opt = rcu_dereference(inet_sk(sk)->inet_opt); |
| 2179 | if (opt && opt->opt.cipso) |
| 2180 | res = cipso_v4_getattr(opt->opt.__data + |
| 2181 | opt->opt.cipso - |
| 2182 | sizeof(struct iphdr), |
| 2183 | secattr); |
| 2184 | rcu_read_unlock(); |
| 2185 | return res; |
Paul Moore | 14a72f5 | 2006-09-25 15:52:01 -0700 | [diff] [blame] | 2186 | } |
| 2187 | |
| 2188 | /** |
Paul Moore | 948bf85 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 2189 | * cipso_v4_skbuff_setattr - Set the CIPSO option on a packet |
| 2190 | * @skb: the packet |
| 2191 | * @secattr: the security attributes |
| 2192 | * |
| 2193 | * Description: |
| 2194 | * Set the CIPSO option on the given packet based on the security attributes. |
| 2195 | * Returns a pointer to the IP header on success and NULL on failure. |
| 2196 | * |
| 2197 | */ |
| 2198 | int cipso_v4_skbuff_setattr(struct sk_buff *skb, |
| 2199 | const struct cipso_v4_doi *doi_def, |
| 2200 | const struct netlbl_lsm_secattr *secattr) |
| 2201 | { |
| 2202 | int ret_val; |
| 2203 | struct iphdr *iph; |
| 2204 | struct ip_options *opt = &IPCB(skb)->opt; |
| 2205 | unsigned char buf[CIPSO_V4_OPT_LEN_MAX]; |
| 2206 | u32 buf_len = CIPSO_V4_OPT_LEN_MAX; |
| 2207 | u32 opt_len; |
| 2208 | int len_delta; |
| 2209 | |
roel kluin | 00af5c6 | 2008-10-29 15:55:53 -0400 | [diff] [blame] | 2210 | ret_val = cipso_v4_genopt(buf, buf_len, doi_def, secattr); |
| 2211 | if (ret_val < 0) |
| 2212 | return ret_val; |
| 2213 | buf_len = ret_val; |
Paul Moore | 948bf85 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 2214 | opt_len = (buf_len + 3) & ~3; |
| 2215 | |
| 2216 | /* we overwrite any existing options to ensure that we have enough |
| 2217 | * room for the CIPSO option, the reason is that we _need_ to guarantee |
| 2218 | * that the security label is applied to the packet - we do the same |
| 2219 | * thing when using the socket options and it hasn't caused a problem, |
| 2220 | * if we need to we can always revisit this choice later */ |
| 2221 | |
| 2222 | len_delta = opt_len - opt->optlen; |
| 2223 | /* if we don't ensure enough headroom we could panic on the skb_push() |
| 2224 | * call below so make sure we have enough, we are also "mangling" the |
| 2225 | * packet so we should probably do a copy-on-write call anyway */ |
| 2226 | ret_val = skb_cow(skb, skb_headroom(skb) + len_delta); |
| 2227 | if (ret_val < 0) |
| 2228 | return ret_val; |
| 2229 | |
| 2230 | if (len_delta > 0) { |
| 2231 | /* we assume that the header + opt->optlen have already been |
| 2232 | * "pushed" in ip_options_build() or similar */ |
| 2233 | iph = ip_hdr(skb); |
| 2234 | skb_push(skb, len_delta); |
| 2235 | memmove((char *)iph - len_delta, iph, iph->ihl << 2); |
| 2236 | skb_reset_network_header(skb); |
| 2237 | iph = ip_hdr(skb); |
| 2238 | } else if (len_delta < 0) { |
| 2239 | iph = ip_hdr(skb); |
| 2240 | memset(iph + 1, IPOPT_NOP, opt->optlen); |
| 2241 | } else |
| 2242 | iph = ip_hdr(skb); |
| 2243 | |
| 2244 | if (opt->optlen > 0) |
| 2245 | memset(opt, 0, sizeof(*opt)); |
| 2246 | opt->optlen = opt_len; |
| 2247 | opt->cipso = sizeof(struct iphdr); |
| 2248 | opt->is_changed = 1; |
| 2249 | |
| 2250 | /* we have to do the following because we are being called from a |
| 2251 | * netfilter hook which means the packet already has had the header |
| 2252 | * fields populated and the checksum calculated - yes this means we |
| 2253 | * are doing more work than needed but we do it to keep the core |
| 2254 | * stack clean and tidy */ |
| 2255 | memcpy(iph + 1, buf, buf_len); |
| 2256 | if (opt_len > buf_len) |
| 2257 | memset((char *)(iph + 1) + buf_len, 0, opt_len - buf_len); |
| 2258 | if (len_delta != 0) { |
| 2259 | iph->ihl = 5 + (opt_len >> 2); |
| 2260 | iph->tot_len = htons(skb->len); |
| 2261 | } |
| 2262 | ip_send_check(iph); |
| 2263 | |
| 2264 | return 0; |
| 2265 | } |
| 2266 | |
| 2267 | /** |
| 2268 | * cipso_v4_skbuff_delattr - Delete any CIPSO options from a packet |
| 2269 | * @skb: the packet |
| 2270 | * |
| 2271 | * Description: |
| 2272 | * Removes any and all CIPSO options from the given packet. Returns zero on |
| 2273 | * success, negative values on failure. |
| 2274 | * |
| 2275 | */ |
| 2276 | int cipso_v4_skbuff_delattr(struct sk_buff *skb) |
| 2277 | { |
| 2278 | int ret_val; |
| 2279 | struct iphdr *iph; |
| 2280 | struct ip_options *opt = &IPCB(skb)->opt; |
| 2281 | unsigned char *cipso_ptr; |
| 2282 | |
| 2283 | if (opt->cipso == 0) |
| 2284 | return 0; |
| 2285 | |
| 2286 | /* since we are changing the packet we should make a copy */ |
| 2287 | ret_val = skb_cow(skb, skb_headroom(skb)); |
| 2288 | if (ret_val < 0) |
| 2289 | return ret_val; |
| 2290 | |
| 2291 | /* the easiest thing to do is just replace the cipso option with noop |
| 2292 | * options since we don't change the size of the packet, although we |
| 2293 | * still need to recalculate the checksum */ |
| 2294 | |
| 2295 | iph = ip_hdr(skb); |
| 2296 | cipso_ptr = (unsigned char *)iph + opt->cipso; |
| 2297 | memset(cipso_ptr, IPOPT_NOOP, cipso_ptr[1]); |
| 2298 | opt->cipso = 0; |
| 2299 | opt->is_changed = 1; |
| 2300 | |
| 2301 | ip_send_check(iph); |
| 2302 | |
| 2303 | return 0; |
| 2304 | } |
| 2305 | |
| 2306 | /** |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 2307 | * cipso_v4_skbuff_getattr - Get the security attributes from the CIPSO option |
| 2308 | * @skb: the packet |
| 2309 | * @secattr: the security attributes |
| 2310 | * |
| 2311 | * Description: |
| 2312 | * Parse the given packet's CIPSO option and return the security attributes. |
| 2313 | * Returns zero on success and negative values on failure. |
| 2314 | * |
| 2315 | */ |
| 2316 | int cipso_v4_skbuff_getattr(const struct sk_buff *skb, |
| 2317 | struct netlbl_lsm_secattr *secattr) |
| 2318 | { |
Paul Moore | 63d804ea | 2007-09-15 21:45:13 -0700 | [diff] [blame] | 2319 | return cipso_v4_getattr(CIPSO_V4_OPTPTR(skb), secattr); |
Paul Moore | 446fda4 | 2006-08-03 16:48:06 -0700 | [diff] [blame] | 2320 | } |
| 2321 | |
| 2322 | /* |
| 2323 | * Setup Functions |
| 2324 | */ |
| 2325 | |
| 2326 | /** |
| 2327 | * cipso_v4_init - Initialize the CIPSO module |
| 2328 | * |
| 2329 | * Description: |
| 2330 | * Initialize the CIPSO module and prepare it for use. Returns zero on success |
| 2331 | * and negative values on failure. |
| 2332 | * |
| 2333 | */ |
| 2334 | static int __init cipso_v4_init(void) |
| 2335 | { |
| 2336 | int ret_val; |
| 2337 | |
| 2338 | ret_val = cipso_v4_cache_init(); |
| 2339 | if (ret_val != 0) |
| 2340 | panic("Failed to initialize the CIPSO/IPv4 cache (%d)\n", |
| 2341 | ret_val); |
| 2342 | |
| 2343 | return 0; |
| 2344 | } |
| 2345 | |
| 2346 | subsys_initcall(cipso_v4_init); |