Commit | Line | Data |
---|---|---|
446fda4f PM |
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 | |
586c2500 | 6 | * FIPS-188. While CIPSO never became a full IETF RFC standard many vendors |
446fda4f PM |
7 | * have chosen to adopt the protocol and over the years it has become a |
8 | * de-facto standard for labeled networking. | |
9 | * | |
586c2500 PM |
10 | * The CIPSO draft specification can be found in the kernel's Documentation |
11 | * directory as well as the following URL: | |
12 | * http://netlabel.sourceforge.net/files/draft-ietf-cipso-ipsecurity-01.txt | |
13 | * The FIPS-188 specification can be found at the following URL: | |
14 | * http://www.itl.nist.gov/fipspubs/fip188.htm | |
15 | * | |
446fda4f PM |
16 | * Author: Paul Moore <paul.moore@hp.com> |
17 | * | |
18 | */ | |
19 | ||
20 | /* | |
948bf85c | 21 | * (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008 |
446fda4f PM |
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 | |
34 | * along with this program; if not, write to the Free Software | |
35 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
36 | * | |
37 | */ | |
38 | ||
39 | #include <linux/init.h> | |
40 | #include <linux/types.h> | |
41 | #include <linux/rcupdate.h> | |
42 | #include <linux/list.h> | |
43 | #include <linux/spinlock.h> | |
44 | #include <linux/string.h> | |
45 | #include <linux/jhash.h> | |
6c2e8ac0 | 46 | #include <linux/audit.h> |
5a0e3ad6 | 47 | #include <linux/slab.h> |
446fda4f PM |
48 | #include <net/ip.h> |
49 | #include <net/icmp.h> | |
50 | #include <net/tcp.h> | |
51 | #include <net/netlabel.h> | |
52 | #include <net/cipso_ipv4.h> | |
ffb733c6 | 53 | #include <asm/atomic.h> |
446fda4f | 54 | #include <asm/bug.h> |
50e5d35c | 55 | #include <asm/unaligned.h> |
446fda4f | 56 | |
446fda4f | 57 | /* List of available DOI definitions */ |
446fda4f PM |
58 | /* XXX - This currently assumes a minimal number of different DOIs in use, |
59 | * if in practice there are a lot of different DOIs this list should | |
60 | * probably be turned into a hash table or something similar so we | |
61 | * can do quick lookups. */ | |
8ce11e6a | 62 | static DEFINE_SPINLOCK(cipso_v4_doi_list_lock); |
1596c97a | 63 | static LIST_HEAD(cipso_v4_doi_list); |
446fda4f PM |
64 | |
65 | /* Label mapping cache */ | |
66 | int cipso_v4_cache_enabled = 1; | |
67 | int cipso_v4_cache_bucketsize = 10; | |
68 | #define CIPSO_V4_CACHE_BUCKETBITS 7 | |
69 | #define CIPSO_V4_CACHE_BUCKETS (1 << CIPSO_V4_CACHE_BUCKETBITS) | |
70 | #define CIPSO_V4_CACHE_REORDERLIMIT 10 | |
71 | struct cipso_v4_map_cache_bkt { | |
72 | spinlock_t lock; | |
73 | u32 size; | |
74 | struct list_head list; | |
75 | }; | |
76 | struct cipso_v4_map_cache_entry { | |
77 | u32 hash; | |
78 | unsigned char *key; | |
79 | size_t key_len; | |
80 | ||
ffb733c6 | 81 | struct netlbl_lsm_cache *lsm_data; |
446fda4f PM |
82 | |
83 | u32 activity; | |
84 | struct list_head list; | |
85 | }; | |
86 | static struct cipso_v4_map_cache_bkt *cipso_v4_cache = NULL; | |
87 | ||
88 | /* Restricted bitmap (tag #1) flags */ | |
89 | int cipso_v4_rbm_optfmt = 0; | |
90 | int cipso_v4_rbm_strictvalid = 1; | |
91 | ||
f998e8cb PM |
92 | /* |
93 | * Protocol Constants | |
94 | */ | |
95 | ||
96 | /* Maximum size of the CIPSO IP option, derived from the fact that the maximum | |
97 | * IPv4 header size is 60 bytes and the base IPv4 header is 20 bytes long. */ | |
98 | #define CIPSO_V4_OPT_LEN_MAX 40 | |
99 | ||
100 | /* Length of the base CIPSO option, this includes the option type (1 byte), the | |
101 | * option length (1 byte), and the DOI (4 bytes). */ | |
102 | #define CIPSO_V4_HDR_LEN 6 | |
103 | ||
104 | /* Base length of the restrictive category bitmap tag (tag #1). */ | |
105 | #define CIPSO_V4_TAG_RBM_BLEN 4 | |
106 | ||
107 | /* Base length of the enumerated category tag (tag #2). */ | |
108 | #define CIPSO_V4_TAG_ENUM_BLEN 4 | |
109 | ||
110 | /* Base length of the ranged categories bitmap tag (tag #5). */ | |
111 | #define CIPSO_V4_TAG_RNG_BLEN 4 | |
112 | /* The maximum number of category ranges permitted in the ranged category tag | |
113 | * (tag #5). You may note that the IETF draft states that the maximum number | |
114 | * of category ranges is 7, but if the low end of the last category range is | |
115 | * zero then it is possibile to fit 8 category ranges because the zero should | |
116 | * be omitted. */ | |
117 | #define CIPSO_V4_TAG_RNG_CAT_MAX 8 | |
118 | ||
15c45f7b PM |
119 | /* Base length of the local tag (non-standard tag). |
120 | * Tag definition (may change between kernel versions) | |
121 | * | |
122 | * 0 8 16 24 32 | |
123 | * +----------+----------+----------+----------+ | |
124 | * | 10000000 | 00000110 | 32-bit secid value | | |
125 | * +----------+----------+----------+----------+ | |
126 | * | in (host byte order)| | |
127 | * +----------+----------+ | |
128 | * | |
129 | */ | |
130 | #define CIPSO_V4_TAG_LOC_BLEN 6 | |
131 | ||
446fda4f PM |
132 | /* |
133 | * Helper Functions | |
134 | */ | |
135 | ||
136 | /** | |
137 | * cipso_v4_bitmap_walk - Walk a bitmap looking for a bit | |
138 | * @bitmap: the bitmap | |
139 | * @bitmap_len: length in bits | |
140 | * @offset: starting offset | |
141 | * @state: if non-zero, look for a set (1) bit else look for a cleared (0) bit | |
142 | * | |
143 | * Description: | |
144 | * Starting at @offset, walk the bitmap from left to right until either the | |
145 | * desired bit is found or we reach the end. Return the bit offset, -1 if | |
146 | * not found, or -2 if error. | |
147 | */ | |
148 | static int cipso_v4_bitmap_walk(const unsigned char *bitmap, | |
149 | u32 bitmap_len, | |
150 | u32 offset, | |
151 | u8 state) | |
152 | { | |
153 | u32 bit_spot; | |
154 | u32 byte_offset; | |
155 | unsigned char bitmask; | |
156 | unsigned char byte; | |
157 | ||
158 | /* gcc always rounds to zero when doing integer division */ | |
159 | byte_offset = offset / 8; | |
160 | byte = bitmap[byte_offset]; | |
161 | bit_spot = offset; | |
162 | bitmask = 0x80 >> (offset % 8); | |
163 | ||
164 | while (bit_spot < bitmap_len) { | |
165 | if ((state && (byte & bitmask) == bitmask) || | |
166 | (state == 0 && (byte & bitmask) == 0)) | |
167 | return bit_spot; | |
168 | ||
169 | bit_spot++; | |
170 | bitmask >>= 1; | |
171 | if (bitmask == 0) { | |
172 | byte = bitmap[++byte_offset]; | |
173 | bitmask = 0x80; | |
174 | } | |
175 | } | |
176 | ||
177 | return -1; | |
178 | } | |
179 | ||
180 | /** | |
181 | * cipso_v4_bitmap_setbit - Sets a single bit in a bitmap | |
182 | * @bitmap: the bitmap | |
183 | * @bit: the bit | |
184 | * @state: if non-zero, set the bit (1) else clear the bit (0) | |
185 | * | |
186 | * Description: | |
187 | * Set a single bit in the bitmask. Returns zero on success, negative values | |
188 | * on error. | |
189 | */ | |
190 | static void cipso_v4_bitmap_setbit(unsigned char *bitmap, | |
191 | u32 bit, | |
192 | u8 state) | |
193 | { | |
194 | u32 byte_spot; | |
195 | u8 bitmask; | |
196 | ||
197 | /* gcc always rounds to zero when doing integer division */ | |
198 | byte_spot = bit / 8; | |
199 | bitmask = 0x80 >> (bit % 8); | |
200 | if (state) | |
201 | bitmap[byte_spot] |= bitmask; | |
202 | else | |
203 | bitmap[byte_spot] &= ~bitmask; | |
204 | } | |
205 | ||
446fda4f PM |
206 | /** |
207 | * cipso_v4_cache_entry_free - Frees a cache entry | |
208 | * @entry: the entry to free | |
209 | * | |
210 | * Description: | |
ffb733c6 | 211 | * This function frees the memory associated with a cache entry including the |
212 | * LSM cache data if there are no longer any users, i.e. reference count == 0. | |
446fda4f PM |
213 | * |
214 | */ | |
215 | static void cipso_v4_cache_entry_free(struct cipso_v4_map_cache_entry *entry) | |
216 | { | |
ffb733c6 | 217 | if (entry->lsm_data) |
218 | netlbl_secattr_cache_free(entry->lsm_data); | |
446fda4f PM |
219 | kfree(entry->key); |
220 | kfree(entry); | |
221 | } | |
222 | ||
223 | /** | |
224 | * cipso_v4_map_cache_hash - Hashing function for the CIPSO cache | |
225 | * @key: the hash key | |
226 | * @key_len: the length of the key in bytes | |
227 | * | |
228 | * Description: | |
229 | * The CIPSO tag hashing function. Returns a 32-bit hash value. | |
230 | * | |
231 | */ | |
232 | static u32 cipso_v4_map_cache_hash(const unsigned char *key, u32 key_len) | |
233 | { | |
234 | return jhash(key, key_len, 0); | |
235 | } | |
236 | ||
237 | /* | |
238 | * Label Mapping Cache Functions | |
239 | */ | |
240 | ||
241 | /** | |
242 | * cipso_v4_cache_init - Initialize the CIPSO cache | |
243 | * | |
244 | * Description: | |
245 | * Initializes the CIPSO label mapping cache, this function should be called | |
246 | * before any of the other functions defined in this file. Returns zero on | |
247 | * success, negative values on error. | |
248 | * | |
249 | */ | |
250 | static int cipso_v4_cache_init(void) | |
251 | { | |
252 | u32 iter; | |
253 | ||
254 | cipso_v4_cache = kcalloc(CIPSO_V4_CACHE_BUCKETS, | |
255 | sizeof(struct cipso_v4_map_cache_bkt), | |
256 | GFP_KERNEL); | |
257 | if (cipso_v4_cache == NULL) | |
258 | return -ENOMEM; | |
259 | ||
260 | for (iter = 0; iter < CIPSO_V4_CACHE_BUCKETS; iter++) { | |
261 | spin_lock_init(&cipso_v4_cache[iter].lock); | |
262 | cipso_v4_cache[iter].size = 0; | |
263 | INIT_LIST_HEAD(&cipso_v4_cache[iter].list); | |
264 | } | |
265 | ||
266 | return 0; | |
267 | } | |
268 | ||
269 | /** | |
270 | * cipso_v4_cache_invalidate - Invalidates the current CIPSO cache | |
271 | * | |
272 | * Description: | |
273 | * Invalidates and frees any entries in the CIPSO cache. Returns zero on | |
274 | * success and negative values on failure. | |
275 | * | |
276 | */ | |
277 | void cipso_v4_cache_invalidate(void) | |
278 | { | |
279 | struct cipso_v4_map_cache_entry *entry, *tmp_entry; | |
280 | u32 iter; | |
281 | ||
282 | for (iter = 0; iter < CIPSO_V4_CACHE_BUCKETS; iter++) { | |
609c92fe | 283 | spin_lock_bh(&cipso_v4_cache[iter].lock); |
446fda4f PM |
284 | list_for_each_entry_safe(entry, |
285 | tmp_entry, | |
286 | &cipso_v4_cache[iter].list, list) { | |
287 | list_del(&entry->list); | |
288 | cipso_v4_cache_entry_free(entry); | |
289 | } | |
290 | cipso_v4_cache[iter].size = 0; | |
609c92fe | 291 | spin_unlock_bh(&cipso_v4_cache[iter].lock); |
446fda4f PM |
292 | } |
293 | ||
294 | return; | |
295 | } | |
296 | ||
297 | /** | |
298 | * cipso_v4_cache_check - Check the CIPSO cache for a label mapping | |
299 | * @key: the buffer to check | |
300 | * @key_len: buffer length in bytes | |
301 | * @secattr: the security attribute struct to use | |
302 | * | |
303 | * Description: | |
304 | * This function checks the cache to see if a label mapping already exists for | |
305 | * the given key. If there is a match then the cache is adjusted and the | |
306 | * @secattr struct is populated with the correct LSM security attributes. The | |
307 | * cache is adjusted in the following manner if the entry is not already the | |
308 | * first in the cache bucket: | |
309 | * | |
310 | * 1. The cache entry's activity counter is incremented | |
311 | * 2. The previous (higher ranking) entry's activity counter is decremented | |
312 | * 3. If the difference between the two activity counters is geater than | |
313 | * CIPSO_V4_CACHE_REORDERLIMIT the two entries are swapped | |
314 | * | |
315 | * Returns zero on success, -ENOENT for a cache miss, and other negative values | |
316 | * on error. | |
317 | * | |
318 | */ | |
319 | static int cipso_v4_cache_check(const unsigned char *key, | |
320 | u32 key_len, | |
321 | struct netlbl_lsm_secattr *secattr) | |
322 | { | |
323 | u32 bkt; | |
324 | struct cipso_v4_map_cache_entry *entry; | |
325 | struct cipso_v4_map_cache_entry *prev_entry = NULL; | |
326 | u32 hash; | |
327 | ||
328 | if (!cipso_v4_cache_enabled) | |
329 | return -ENOENT; | |
330 | ||
331 | hash = cipso_v4_map_cache_hash(key, key_len); | |
5e0f8923 | 332 | bkt = hash & (CIPSO_V4_CACHE_BUCKETS - 1); |
609c92fe | 333 | spin_lock_bh(&cipso_v4_cache[bkt].lock); |
446fda4f PM |
334 | list_for_each_entry(entry, &cipso_v4_cache[bkt].list, list) { |
335 | if (entry->hash == hash && | |
336 | entry->key_len == key_len && | |
337 | memcmp(entry->key, key, key_len) == 0) { | |
338 | entry->activity += 1; | |
ffb733c6 | 339 | atomic_inc(&entry->lsm_data->refcount); |
340 | secattr->cache = entry->lsm_data; | |
701a90ba | 341 | secattr->flags |= NETLBL_SECATTR_CACHE; |
16efd454 | 342 | secattr->type = NETLBL_NLTYPE_CIPSOV4; |
446fda4f | 343 | if (prev_entry == NULL) { |
609c92fe | 344 | spin_unlock_bh(&cipso_v4_cache[bkt].lock); |
446fda4f PM |
345 | return 0; |
346 | } | |
347 | ||
348 | if (prev_entry->activity > 0) | |
349 | prev_entry->activity -= 1; | |
350 | if (entry->activity > prev_entry->activity && | |
351 | entry->activity - prev_entry->activity > | |
352 | CIPSO_V4_CACHE_REORDERLIMIT) { | |
353 | __list_del(entry->list.prev, entry->list.next); | |
354 | __list_add(&entry->list, | |
355 | prev_entry->list.prev, | |
356 | &prev_entry->list); | |
357 | } | |
358 | ||
609c92fe | 359 | spin_unlock_bh(&cipso_v4_cache[bkt].lock); |
446fda4f PM |
360 | return 0; |
361 | } | |
362 | prev_entry = entry; | |
363 | } | |
609c92fe | 364 | spin_unlock_bh(&cipso_v4_cache[bkt].lock); |
446fda4f PM |
365 | |
366 | return -ENOENT; | |
367 | } | |
368 | ||
369 | /** | |
370 | * cipso_v4_cache_add - Add an entry to the CIPSO cache | |
371 | * @skb: the packet | |
372 | * @secattr: the packet's security attributes | |
373 | * | |
374 | * Description: | |
375 | * Add a new entry into the CIPSO label mapping cache. Add the new entry to | |
376 | * head of the cache bucket's list, if the cache bucket is out of room remove | |
377 | * the last entry in the list first. It is important to note that there is | |
378 | * currently no checking for duplicate keys. Returns zero on success, | |
379 | * negative values on failure. | |
380 | * | |
381 | */ | |
382 | int cipso_v4_cache_add(const struct sk_buff *skb, | |
383 | const struct netlbl_lsm_secattr *secattr) | |
384 | { | |
385 | int ret_val = -EPERM; | |
386 | u32 bkt; | |
387 | struct cipso_v4_map_cache_entry *entry = NULL; | |
388 | struct cipso_v4_map_cache_entry *old_entry = NULL; | |
389 | unsigned char *cipso_ptr; | |
390 | u32 cipso_ptr_len; | |
391 | ||
392 | if (!cipso_v4_cache_enabled || cipso_v4_cache_bucketsize <= 0) | |
393 | return 0; | |
394 | ||
395 | cipso_ptr = CIPSO_V4_OPTPTR(skb); | |
396 | cipso_ptr_len = cipso_ptr[1]; | |
397 | ||
398 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); | |
399 | if (entry == NULL) | |
400 | return -ENOMEM; | |
fac5d731 | 401 | entry->key = kmemdup(cipso_ptr, cipso_ptr_len, GFP_ATOMIC); |
446fda4f PM |
402 | if (entry->key == NULL) { |
403 | ret_val = -ENOMEM; | |
404 | goto cache_add_failure; | |
405 | } | |
446fda4f PM |
406 | entry->key_len = cipso_ptr_len; |
407 | entry->hash = cipso_v4_map_cache_hash(cipso_ptr, cipso_ptr_len); | |
ffb733c6 | 408 | atomic_inc(&secattr->cache->refcount); |
409 | entry->lsm_data = secattr->cache; | |
446fda4f | 410 | |
5e0f8923 | 411 | bkt = entry->hash & (CIPSO_V4_CACHE_BUCKETS - 1); |
609c92fe | 412 | spin_lock_bh(&cipso_v4_cache[bkt].lock); |
446fda4f PM |
413 | if (cipso_v4_cache[bkt].size < cipso_v4_cache_bucketsize) { |
414 | list_add(&entry->list, &cipso_v4_cache[bkt].list); | |
415 | cipso_v4_cache[bkt].size += 1; | |
416 | } else { | |
417 | old_entry = list_entry(cipso_v4_cache[bkt].list.prev, | |
418 | struct cipso_v4_map_cache_entry, list); | |
419 | list_del(&old_entry->list); | |
420 | list_add(&entry->list, &cipso_v4_cache[bkt].list); | |
421 | cipso_v4_cache_entry_free(old_entry); | |
422 | } | |
609c92fe | 423 | spin_unlock_bh(&cipso_v4_cache[bkt].lock); |
446fda4f PM |
424 | |
425 | return 0; | |
426 | ||
427 | cache_add_failure: | |
428 | if (entry) | |
429 | cipso_v4_cache_entry_free(entry); | |
430 | return ret_val; | |
431 | } | |
432 | ||
433 | /* | |
434 | * DOI List Functions | |
435 | */ | |
436 | ||
437 | /** | |
438 | * cipso_v4_doi_search - Searches for a DOI definition | |
439 | * @doi: the DOI to search for | |
440 | * | |
441 | * Description: | |
442 | * Search the DOI definition list for a DOI definition with a DOI value that | |
443 | * matches @doi. The caller is responsibile for calling rcu_read_[un]lock(). | |
444 | * Returns a pointer to the DOI definition on success and NULL on failure. | |
445 | */ | |
446 | static struct cipso_v4_doi *cipso_v4_doi_search(u32 doi) | |
447 | { | |
448 | struct cipso_v4_doi *iter; | |
449 | ||
450 | list_for_each_entry_rcu(iter, &cipso_v4_doi_list, list) | |
b1edeb10 | 451 | if (iter->doi == doi && atomic_read(&iter->refcount)) |
446fda4f PM |
452 | return iter; |
453 | return NULL; | |
454 | } | |
455 | ||
456 | /** | |
457 | * cipso_v4_doi_add - Add a new DOI to the CIPSO protocol engine | |
458 | * @doi_def: the DOI structure | |
6c2e8ac0 | 459 | * @audit_info: NetLabel audit information |
446fda4f PM |
460 | * |
461 | * Description: | |
462 | * The caller defines a new DOI for use by the CIPSO engine and calls this | |
463 | * function to add it to the list of acceptable domains. The caller must | |
464 | * ensure that the mapping table specified in @doi_def->map meets all of the | |
465 | * requirements of the mapping type (see cipso_ipv4.h for details). Returns | |
466 | * zero on success and non-zero on failure. | |
467 | * | |
468 | */ | |
6c2e8ac0 PM |
469 | int cipso_v4_doi_add(struct cipso_v4_doi *doi_def, |
470 | struct netlbl_audit *audit_info) | |
446fda4f | 471 | { |
6c2e8ac0 | 472 | int ret_val = -EINVAL; |
6ce61a7c | 473 | u32 iter; |
6c2e8ac0 PM |
474 | u32 doi; |
475 | u32 doi_type; | |
476 | struct audit_buffer *audit_buf; | |
477 | ||
478 | doi = doi_def->doi; | |
479 | doi_type = doi_def->type; | |
6ce61a7c | 480 | |
446fda4f | 481 | if (doi_def == NULL || doi_def->doi == CIPSO_V4_DOI_UNKNOWN) |
6c2e8ac0 | 482 | goto doi_add_return; |
6ce61a7c PM |
483 | for (iter = 0; iter < CIPSO_V4_TAG_MAXCNT; iter++) { |
484 | switch (doi_def->tags[iter]) { | |
485 | case CIPSO_V4_TAG_RBITMAP: | |
486 | break; | |
484b3669 | 487 | case CIPSO_V4_TAG_RANGE: |
654bbc2a PM |
488 | case CIPSO_V4_TAG_ENUM: |
489 | if (doi_def->type != CIPSO_V4_MAP_PASS) | |
6c2e8ac0 | 490 | goto doi_add_return; |
654bbc2a | 491 | break; |
15c45f7b PM |
492 | case CIPSO_V4_TAG_LOCAL: |
493 | if (doi_def->type != CIPSO_V4_MAP_LOCAL) | |
6c2e8ac0 PM |
494 | goto doi_add_return; |
495 | break; | |
496 | case CIPSO_V4_TAG_INVALID: | |
497 | if (iter == 0) | |
498 | goto doi_add_return; | |
15c45f7b | 499 | break; |
6ce61a7c | 500 | default: |
6c2e8ac0 | 501 | goto doi_add_return; |
6ce61a7c PM |
502 | } |
503 | } | |
446fda4f | 504 | |
b1edeb10 | 505 | atomic_set(&doi_def->refcount, 1); |
446fda4f | 506 | |
446fda4f | 507 | spin_lock(&cipso_v4_doi_list_lock); |
6c2e8ac0 PM |
508 | if (cipso_v4_doi_search(doi_def->doi) != NULL) { |
509 | spin_unlock(&cipso_v4_doi_list_lock); | |
510 | ret_val = -EEXIST; | |
511 | goto doi_add_return; | |
512 | } | |
446fda4f PM |
513 | list_add_tail_rcu(&doi_def->list, &cipso_v4_doi_list); |
514 | spin_unlock(&cipso_v4_doi_list_lock); | |
6c2e8ac0 PM |
515 | ret_val = 0; |
516 | ||
517 | doi_add_return: | |
518 | audit_buf = netlbl_audit_start(AUDIT_MAC_CIPSOV4_ADD, audit_info); | |
519 | if (audit_buf != NULL) { | |
520 | const char *type_str; | |
521 | switch (doi_type) { | |
522 | case CIPSO_V4_MAP_TRANS: | |
523 | type_str = "trans"; | |
524 | break; | |
525 | case CIPSO_V4_MAP_PASS: | |
526 | type_str = "pass"; | |
527 | break; | |
528 | case CIPSO_V4_MAP_LOCAL: | |
529 | type_str = "local"; | |
530 | break; | |
531 | default: | |
532 | type_str = "(unknown)"; | |
533 | } | |
534 | audit_log_format(audit_buf, | |
535 | " cipso_doi=%u cipso_type=%s res=%u", | |
536 | doi, type_str, ret_val == 0 ? 1 : 0); | |
537 | audit_log_end(audit_buf); | |
538 | } | |
446fda4f | 539 | |
6c2e8ac0 | 540 | return ret_val; |
446fda4f PM |
541 | } |
542 | ||
b1edeb10 PM |
543 | /** |
544 | * cipso_v4_doi_free - Frees a DOI definition | |
545 | * @entry: the entry's RCU field | |
546 | * | |
547 | * Description: | |
548 | * This function frees all of the memory associated with a DOI definition. | |
549 | * | |
550 | */ | |
551 | void cipso_v4_doi_free(struct cipso_v4_doi *doi_def) | |
552 | { | |
553 | if (doi_def == NULL) | |
554 | return; | |
555 | ||
556 | switch (doi_def->type) { | |
15c45f7b | 557 | case CIPSO_V4_MAP_TRANS: |
b1edeb10 PM |
558 | kfree(doi_def->map.std->lvl.cipso); |
559 | kfree(doi_def->map.std->lvl.local); | |
560 | kfree(doi_def->map.std->cat.cipso); | |
561 | kfree(doi_def->map.std->cat.local); | |
562 | break; | |
563 | } | |
564 | kfree(doi_def); | |
565 | } | |
566 | ||
567 | /** | |
568 | * cipso_v4_doi_free_rcu - Frees a DOI definition via the RCU pointer | |
569 | * @entry: the entry's RCU field | |
570 | * | |
571 | * Description: | |
572 | * This function is designed to be used as a callback to the call_rcu() | |
573 | * function so that the memory allocated to the DOI definition can be released | |
574 | * safely. | |
575 | * | |
576 | */ | |
577 | static void cipso_v4_doi_free_rcu(struct rcu_head *entry) | |
578 | { | |
579 | struct cipso_v4_doi *doi_def; | |
580 | ||
581 | doi_def = container_of(entry, struct cipso_v4_doi, rcu); | |
582 | cipso_v4_doi_free(doi_def); | |
583 | } | |
584 | ||
446fda4f PM |
585 | /** |
586 | * cipso_v4_doi_remove - Remove an existing DOI from the CIPSO protocol engine | |
587 | * @doi: the DOI value | |
32f50cde | 588 | * @audit_secid: the LSM secid to use in the audit message |
446fda4f PM |
589 | * |
590 | * Description: | |
b1edeb10 PM |
591 | * Removes a DOI definition from the CIPSO engine. The NetLabel routines will |
592 | * be called to release their own LSM domain mappings as well as our own | |
593 | * domain list. Returns zero on success and negative values on failure. | |
446fda4f PM |
594 | * |
595 | */ | |
b1edeb10 | 596 | int cipso_v4_doi_remove(u32 doi, struct netlbl_audit *audit_info) |
446fda4f | 597 | { |
6c2e8ac0 | 598 | int ret_val; |
446fda4f | 599 | struct cipso_v4_doi *doi_def; |
6c2e8ac0 | 600 | struct audit_buffer *audit_buf; |
446fda4f | 601 | |
4be2700f PM |
602 | spin_lock(&cipso_v4_doi_list_lock); |
603 | doi_def = cipso_v4_doi_search(doi); | |
b1edeb10 | 604 | if (doi_def == NULL) { |
446fda4f | 605 | spin_unlock(&cipso_v4_doi_list_lock); |
6c2e8ac0 PM |
606 | ret_val = -ENOENT; |
607 | goto doi_remove_return; | |
446fda4f | 608 | } |
b1edeb10 PM |
609 | if (!atomic_dec_and_test(&doi_def->refcount)) { |
610 | spin_unlock(&cipso_v4_doi_list_lock); | |
6c2e8ac0 PM |
611 | ret_val = -EBUSY; |
612 | goto doi_remove_return; | |
b1edeb10 PM |
613 | } |
614 | list_del_rcu(&doi_def->list); | |
4be2700f | 615 | spin_unlock(&cipso_v4_doi_list_lock); |
446fda4f | 616 | |
b1edeb10 PM |
617 | cipso_v4_cache_invalidate(); |
618 | call_rcu(&doi_def->rcu, cipso_v4_doi_free_rcu); | |
6c2e8ac0 PM |
619 | ret_val = 0; |
620 | ||
621 | doi_remove_return: | |
622 | audit_buf = netlbl_audit_start(AUDIT_MAC_CIPSOV4_DEL, audit_info); | |
623 | if (audit_buf != NULL) { | |
624 | audit_log_format(audit_buf, | |
625 | " cipso_doi=%u res=%u", | |
626 | doi, ret_val == 0 ? 1 : 0); | |
627 | audit_log_end(audit_buf); | |
628 | } | |
b1edeb10 | 629 | |
6c2e8ac0 | 630 | return ret_val; |
446fda4f PM |
631 | } |
632 | ||
633 | /** | |
b1edeb10 | 634 | * cipso_v4_doi_getdef - Returns a reference to a valid DOI definition |
446fda4f PM |
635 | * @doi: the DOI value |
636 | * | |
637 | * Description: | |
638 | * Searches for a valid DOI definition and if one is found it is returned to | |
639 | * the caller. Otherwise NULL is returned. The caller must ensure that | |
b1edeb10 PM |
640 | * rcu_read_lock() is held while accessing the returned definition and the DOI |
641 | * definition reference count is decremented when the caller is done. | |
446fda4f PM |
642 | * |
643 | */ | |
644 | struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi) | |
645 | { | |
b1edeb10 PM |
646 | struct cipso_v4_doi *doi_def; |
647 | ||
648 | rcu_read_lock(); | |
649 | doi_def = cipso_v4_doi_search(doi); | |
650 | if (doi_def == NULL) | |
651 | goto doi_getdef_return; | |
652 | if (!atomic_inc_not_zero(&doi_def->refcount)) | |
653 | doi_def = NULL; | |
654 | ||
655 | doi_getdef_return: | |
656 | rcu_read_unlock(); | |
657 | return doi_def; | |
658 | } | |
659 | ||
660 | /** | |
661 | * cipso_v4_doi_putdef - Releases a reference for the given DOI definition | |
662 | * @doi_def: the DOI definition | |
663 | * | |
664 | * Description: | |
665 | * Releases a DOI definition reference obtained from cipso_v4_doi_getdef(). | |
666 | * | |
667 | */ | |
668 | void cipso_v4_doi_putdef(struct cipso_v4_doi *doi_def) | |
669 | { | |
670 | if (doi_def == NULL) | |
671 | return; | |
672 | ||
673 | if (!atomic_dec_and_test(&doi_def->refcount)) | |
674 | return; | |
675 | spin_lock(&cipso_v4_doi_list_lock); | |
676 | list_del_rcu(&doi_def->list); | |
677 | spin_unlock(&cipso_v4_doi_list_lock); | |
678 | ||
679 | cipso_v4_cache_invalidate(); | |
680 | call_rcu(&doi_def->rcu, cipso_v4_doi_free_rcu); | |
446fda4f PM |
681 | } |
682 | ||
683 | /** | |
fcd48280 PM |
684 | * cipso_v4_doi_walk - Iterate through the DOI definitions |
685 | * @skip_cnt: skip past this number of DOI definitions, updated | |
686 | * @callback: callback for each DOI definition | |
687 | * @cb_arg: argument for the callback function | |
446fda4f PM |
688 | * |
689 | * Description: | |
fcd48280 PM |
690 | * Iterate over the DOI definition list, skipping the first @skip_cnt entries. |
691 | * For each entry call @callback, if @callback returns a negative value stop | |
692 | * 'walking' through the list and return. Updates the value in @skip_cnt upon | |
693 | * return. Returns zero on success, negative values on failure. | |
446fda4f PM |
694 | * |
695 | */ | |
fcd48280 PM |
696 | int cipso_v4_doi_walk(u32 *skip_cnt, |
697 | int (*callback) (struct cipso_v4_doi *doi_def, void *arg), | |
698 | void *cb_arg) | |
446fda4f | 699 | { |
fcd48280 | 700 | int ret_val = -ENOENT; |
446fda4f | 701 | u32 doi_cnt = 0; |
fcd48280 | 702 | struct cipso_v4_doi *iter_doi; |
446fda4f | 703 | |
446fda4f | 704 | rcu_read_lock(); |
fcd48280 | 705 | list_for_each_entry_rcu(iter_doi, &cipso_v4_doi_list, list) |
b1edeb10 | 706 | if (atomic_read(&iter_doi->refcount) > 0) { |
fcd48280 PM |
707 | if (doi_cnt++ < *skip_cnt) |
708 | continue; | |
709 | ret_val = callback(iter_doi, cb_arg); | |
710 | if (ret_val < 0) { | |
711 | doi_cnt--; | |
712 | goto doi_walk_return; | |
446fda4f | 713 | } |
446fda4f | 714 | } |
446fda4f | 715 | |
fcd48280 | 716 | doi_walk_return: |
446fda4f | 717 | rcu_read_unlock(); |
fcd48280 PM |
718 | *skip_cnt = doi_cnt; |
719 | return ret_val; | |
446fda4f PM |
720 | } |
721 | ||
446fda4f PM |
722 | /* |
723 | * Label Mapping Functions | |
724 | */ | |
725 | ||
726 | /** | |
727 | * cipso_v4_map_lvl_valid - Checks to see if the given level is understood | |
728 | * @doi_def: the DOI definition | |
729 | * @level: the level to check | |
730 | * | |
731 | * Description: | |
732 | * Checks the given level against the given DOI definition and returns a | |
733 | * negative value if the level does not have a valid mapping and a zero value | |
734 | * if the level is defined by the DOI. | |
735 | * | |
736 | */ | |
737 | static int cipso_v4_map_lvl_valid(const struct cipso_v4_doi *doi_def, u8 level) | |
738 | { | |
739 | switch (doi_def->type) { | |
740 | case CIPSO_V4_MAP_PASS: | |
741 | return 0; | |
15c45f7b | 742 | case CIPSO_V4_MAP_TRANS: |
446fda4f PM |
743 | if (doi_def->map.std->lvl.cipso[level] < CIPSO_V4_INV_LVL) |
744 | return 0; | |
745 | break; | |
746 | } | |
747 | ||
748 | return -EFAULT; | |
749 | } | |
750 | ||
751 | /** | |
752 | * cipso_v4_map_lvl_hton - Perform a level mapping from the host to the network | |
753 | * @doi_def: the DOI definition | |
754 | * @host_lvl: the host MLS level | |
755 | * @net_lvl: the network/CIPSO MLS level | |
756 | * | |
757 | * Description: | |
758 | * Perform a label mapping to translate a local MLS level to the correct | |
759 | * CIPSO level using the given DOI definition. Returns zero on success, | |
760 | * negative values otherwise. | |
761 | * | |
762 | */ | |
763 | static int cipso_v4_map_lvl_hton(const struct cipso_v4_doi *doi_def, | |
764 | u32 host_lvl, | |
765 | u32 *net_lvl) | |
766 | { | |
767 | switch (doi_def->type) { | |
768 | case CIPSO_V4_MAP_PASS: | |
769 | *net_lvl = host_lvl; | |
770 | return 0; | |
15c45f7b | 771 | case CIPSO_V4_MAP_TRANS: |
c6387a86 PM |
772 | if (host_lvl < doi_def->map.std->lvl.local_size && |
773 | doi_def->map.std->lvl.local[host_lvl] < CIPSO_V4_INV_LVL) { | |
446fda4f PM |
774 | *net_lvl = doi_def->map.std->lvl.local[host_lvl]; |
775 | return 0; | |
776 | } | |
c6387a86 | 777 | return -EPERM; |
446fda4f PM |
778 | } |
779 | ||
780 | return -EINVAL; | |
781 | } | |
782 | ||
783 | /** | |
784 | * cipso_v4_map_lvl_ntoh - Perform a level mapping from the network to the host | |
785 | * @doi_def: the DOI definition | |
786 | * @net_lvl: the network/CIPSO MLS level | |
787 | * @host_lvl: the host MLS level | |
788 | * | |
789 | * Description: | |
790 | * Perform a label mapping to translate a CIPSO level to the correct local MLS | |
791 | * level using the given DOI definition. Returns zero on success, negative | |
792 | * values otherwise. | |
793 | * | |
794 | */ | |
795 | static int cipso_v4_map_lvl_ntoh(const struct cipso_v4_doi *doi_def, | |
796 | u32 net_lvl, | |
797 | u32 *host_lvl) | |
798 | { | |
799 | struct cipso_v4_std_map_tbl *map_tbl; | |
800 | ||
801 | switch (doi_def->type) { | |
802 | case CIPSO_V4_MAP_PASS: | |
803 | *host_lvl = net_lvl; | |
804 | return 0; | |
15c45f7b | 805 | case CIPSO_V4_MAP_TRANS: |
446fda4f PM |
806 | map_tbl = doi_def->map.std; |
807 | if (net_lvl < map_tbl->lvl.cipso_size && | |
808 | map_tbl->lvl.cipso[net_lvl] < CIPSO_V4_INV_LVL) { | |
809 | *host_lvl = doi_def->map.std->lvl.cipso[net_lvl]; | |
810 | return 0; | |
811 | } | |
c6387a86 | 812 | return -EPERM; |
446fda4f PM |
813 | } |
814 | ||
815 | return -EINVAL; | |
816 | } | |
817 | ||
818 | /** | |
819 | * cipso_v4_map_cat_rbm_valid - Checks to see if the category bitmap is valid | |
820 | * @doi_def: the DOI definition | |
821 | * @bitmap: category bitmap | |
822 | * @bitmap_len: bitmap length in bytes | |
823 | * | |
824 | * Description: | |
825 | * Checks the given category bitmap against the given DOI definition and | |
826 | * returns a negative value if any of the categories in the bitmap do not have | |
827 | * a valid mapping and a zero value if all of the categories are valid. | |
828 | * | |
829 | */ | |
830 | static int cipso_v4_map_cat_rbm_valid(const struct cipso_v4_doi *doi_def, | |
831 | const unsigned char *bitmap, | |
832 | u32 bitmap_len) | |
833 | { | |
834 | int cat = -1; | |
835 | u32 bitmap_len_bits = bitmap_len * 8; | |
044a68ed PM |
836 | u32 cipso_cat_size; |
837 | u32 *cipso_array; | |
446fda4f PM |
838 | |
839 | switch (doi_def->type) { | |
840 | case CIPSO_V4_MAP_PASS: | |
841 | return 0; | |
15c45f7b | 842 | case CIPSO_V4_MAP_TRANS: |
044a68ed PM |
843 | cipso_cat_size = doi_def->map.std->cat.cipso_size; |
844 | cipso_array = doi_def->map.std->cat.cipso; | |
446fda4f PM |
845 | for (;;) { |
846 | cat = cipso_v4_bitmap_walk(bitmap, | |
847 | bitmap_len_bits, | |
848 | cat + 1, | |
849 | 1); | |
850 | if (cat < 0) | |
851 | break; | |
852 | if (cat >= cipso_cat_size || | |
853 | cipso_array[cat] >= CIPSO_V4_INV_CAT) | |
854 | return -EFAULT; | |
855 | } | |
856 | ||
857 | if (cat == -1) | |
858 | return 0; | |
859 | break; | |
860 | } | |
861 | ||
862 | return -EFAULT; | |
863 | } | |
864 | ||
865 | /** | |
866 | * cipso_v4_map_cat_rbm_hton - Perform a category mapping from host to network | |
867 | * @doi_def: the DOI definition | |
02752760 | 868 | * @secattr: the security attributes |
446fda4f PM |
869 | * @net_cat: the zero'd out category bitmap in network/CIPSO format |
870 | * @net_cat_len: the length of the CIPSO bitmap in bytes | |
871 | * | |
872 | * Description: | |
873 | * Perform a label mapping to translate a local MLS category bitmap to the | |
874 | * correct CIPSO bitmap using the given DOI definition. Returns the minimum | |
875 | * size in bytes of the network bitmap on success, negative values otherwise. | |
876 | * | |
877 | */ | |
878 | static int cipso_v4_map_cat_rbm_hton(const struct cipso_v4_doi *doi_def, | |
02752760 | 879 | const struct netlbl_lsm_secattr *secattr, |
446fda4f PM |
880 | unsigned char *net_cat, |
881 | u32 net_cat_len) | |
882 | { | |
883 | int host_spot = -1; | |
02752760 | 884 | u32 net_spot = CIPSO_V4_INV_CAT; |
446fda4f | 885 | u32 net_spot_max = 0; |
446fda4f | 886 | u32 net_clen_bits = net_cat_len * 8; |
02752760 PM |
887 | u32 host_cat_size = 0; |
888 | u32 *host_cat_array = NULL; | |
446fda4f | 889 | |
15c45f7b | 890 | if (doi_def->type == CIPSO_V4_MAP_TRANS) { |
044a68ed PM |
891 | host_cat_size = doi_def->map.std->cat.local_size; |
892 | host_cat_array = doi_def->map.std->cat.local; | |
02752760 PM |
893 | } |
894 | ||
895 | for (;;) { | |
16efd454 | 896 | host_spot = netlbl_secattr_catmap_walk(secattr->attr.mls.cat, |
02752760 PM |
897 | host_spot + 1); |
898 | if (host_spot < 0) | |
899 | break; | |
900 | ||
901 | switch (doi_def->type) { | |
902 | case CIPSO_V4_MAP_PASS: | |
903 | net_spot = host_spot; | |
904 | break; | |
15c45f7b | 905 | case CIPSO_V4_MAP_TRANS: |
446fda4f PM |
906 | if (host_spot >= host_cat_size) |
907 | return -EPERM; | |
446fda4f | 908 | net_spot = host_cat_array[host_spot]; |
9fade4bf PM |
909 | if (net_spot >= CIPSO_V4_INV_CAT) |
910 | return -EPERM; | |
02752760 | 911 | break; |
446fda4f | 912 | } |
02752760 PM |
913 | if (net_spot >= net_clen_bits) |
914 | return -ENOSPC; | |
915 | cipso_v4_bitmap_setbit(net_cat, net_spot, 1); | |
446fda4f | 916 | |
02752760 PM |
917 | if (net_spot > net_spot_max) |
918 | net_spot_max = net_spot; | |
446fda4f PM |
919 | } |
920 | ||
02752760 PM |
921 | if (++net_spot_max % 8) |
922 | return net_spot_max / 8 + 1; | |
923 | return net_spot_max / 8; | |
446fda4f PM |
924 | } |
925 | ||
926 | /** | |
927 | * cipso_v4_map_cat_rbm_ntoh - Perform a category mapping from network to host | |
928 | * @doi_def: the DOI definition | |
929 | * @net_cat: the category bitmap in network/CIPSO format | |
930 | * @net_cat_len: the length of the CIPSO bitmap in bytes | |
02752760 | 931 | * @secattr: the security attributes |
446fda4f PM |
932 | * |
933 | * Description: | |
934 | * Perform a label mapping to translate a CIPSO bitmap to the correct local | |
02752760 PM |
935 | * MLS category bitmap using the given DOI definition. Returns zero on |
936 | * success, negative values on failure. | |
446fda4f PM |
937 | * |
938 | */ | |
939 | static int cipso_v4_map_cat_rbm_ntoh(const struct cipso_v4_doi *doi_def, | |
940 | const unsigned char *net_cat, | |
941 | u32 net_cat_len, | |
02752760 | 942 | struct netlbl_lsm_secattr *secattr) |
446fda4f | 943 | { |
02752760 | 944 | int ret_val; |
446fda4f | 945 | int net_spot = -1; |
02752760 | 946 | u32 host_spot = CIPSO_V4_INV_CAT; |
446fda4f | 947 | u32 net_clen_bits = net_cat_len * 8; |
02752760 PM |
948 | u32 net_cat_size = 0; |
949 | u32 *net_cat_array = NULL; | |
446fda4f | 950 | |
15c45f7b | 951 | if (doi_def->type == CIPSO_V4_MAP_TRANS) { |
044a68ed PM |
952 | net_cat_size = doi_def->map.std->cat.cipso_size; |
953 | net_cat_array = doi_def->map.std->cat.cipso; | |
02752760 | 954 | } |
446fda4f | 955 | |
02752760 PM |
956 | for (;;) { |
957 | net_spot = cipso_v4_bitmap_walk(net_cat, | |
958 | net_clen_bits, | |
959 | net_spot + 1, | |
960 | 1); | |
961 | if (net_spot < 0) { | |
962 | if (net_spot == -2) | |
963 | return -EFAULT; | |
964 | return 0; | |
965 | } | |
966 | ||
967 | switch (doi_def->type) { | |
968 | case CIPSO_V4_MAP_PASS: | |
969 | host_spot = net_spot; | |
970 | break; | |
15c45f7b | 971 | case CIPSO_V4_MAP_TRANS: |
02752760 PM |
972 | if (net_spot >= net_cat_size) |
973 | return -EPERM; | |
446fda4f | 974 | host_spot = net_cat_array[net_spot]; |
9fade4bf PM |
975 | if (host_spot >= CIPSO_V4_INV_CAT) |
976 | return -EPERM; | |
02752760 | 977 | break; |
446fda4f | 978 | } |
16efd454 | 979 | ret_val = netlbl_secattr_catmap_setbit(secattr->attr.mls.cat, |
02752760 PM |
980 | host_spot, |
981 | GFP_ATOMIC); | |
982 | if (ret_val != 0) | |
983 | return ret_val; | |
446fda4f PM |
984 | } |
985 | ||
986 | return -EINVAL; | |
987 | } | |
988 | ||
654bbc2a PM |
989 | /** |
990 | * cipso_v4_map_cat_enum_valid - Checks to see if the categories are valid | |
991 | * @doi_def: the DOI definition | |
992 | * @enumcat: category list | |
993 | * @enumcat_len: length of the category list in bytes | |
994 | * | |
995 | * Description: | |
996 | * Checks the given categories against the given DOI definition and returns a | |
997 | * negative value if any of the categories do not have a valid mapping and a | |
998 | * zero value if all of the categories are valid. | |
999 | * | |
1000 | */ | |
1001 | static int cipso_v4_map_cat_enum_valid(const struct cipso_v4_doi *doi_def, | |
1002 | const unsigned char *enumcat, | |
1003 | u32 enumcat_len) | |
1004 | { | |
1005 | u16 cat; | |
1006 | int cat_prev = -1; | |
1007 | u32 iter; | |
1008 | ||
1009 | if (doi_def->type != CIPSO_V4_MAP_PASS || enumcat_len & 0x01) | |
1010 | return -EFAULT; | |
1011 | ||
1012 | for (iter = 0; iter < enumcat_len; iter += 2) { | |
d3e2ce3b | 1013 | cat = get_unaligned_be16(&enumcat[iter]); |
654bbc2a PM |
1014 | if (cat <= cat_prev) |
1015 | return -EFAULT; | |
1016 | cat_prev = cat; | |
1017 | } | |
1018 | ||
1019 | return 0; | |
1020 | } | |
1021 | ||
1022 | /** | |
1023 | * cipso_v4_map_cat_enum_hton - Perform a category mapping from host to network | |
1024 | * @doi_def: the DOI definition | |
1025 | * @secattr: the security attributes | |
1026 | * @net_cat: the zero'd out category list in network/CIPSO format | |
1027 | * @net_cat_len: the length of the CIPSO category list in bytes | |
1028 | * | |
1029 | * Description: | |
1030 | * Perform a label mapping to translate a local MLS category bitmap to the | |
1031 | * correct CIPSO category list using the given DOI definition. Returns the | |
1032 | * size in bytes of the network category bitmap on success, negative values | |
1033 | * otherwise. | |
1034 | * | |
1035 | */ | |
1036 | static int cipso_v4_map_cat_enum_hton(const struct cipso_v4_doi *doi_def, | |
1037 | const struct netlbl_lsm_secattr *secattr, | |
1038 | unsigned char *net_cat, | |
1039 | u32 net_cat_len) | |
1040 | { | |
1041 | int cat = -1; | |
1042 | u32 cat_iter = 0; | |
1043 | ||
1044 | for (;;) { | |
16efd454 PM |
1045 | cat = netlbl_secattr_catmap_walk(secattr->attr.mls.cat, |
1046 | cat + 1); | |
654bbc2a PM |
1047 | if (cat < 0) |
1048 | break; | |
1049 | if ((cat_iter + 2) > net_cat_len) | |
1050 | return -ENOSPC; | |
1051 | ||
1052 | *((__be16 *)&net_cat[cat_iter]) = htons(cat); | |
1053 | cat_iter += 2; | |
1054 | } | |
1055 | ||
1056 | return cat_iter; | |
1057 | } | |
1058 | ||
1059 | /** | |
1060 | * cipso_v4_map_cat_enum_ntoh - Perform a category mapping from network to host | |
1061 | * @doi_def: the DOI definition | |
1062 | * @net_cat: the category list in network/CIPSO format | |
1063 | * @net_cat_len: the length of the CIPSO bitmap in bytes | |
1064 | * @secattr: the security attributes | |
1065 | * | |
1066 | * Description: | |
1067 | * Perform a label mapping to translate a CIPSO category list to the correct | |
1068 | * local MLS category bitmap using the given DOI definition. Returns zero on | |
1069 | * success, negative values on failure. | |
1070 | * | |
1071 | */ | |
1072 | static int cipso_v4_map_cat_enum_ntoh(const struct cipso_v4_doi *doi_def, | |
1073 | const unsigned char *net_cat, | |
1074 | u32 net_cat_len, | |
1075 | struct netlbl_lsm_secattr *secattr) | |
1076 | { | |
1077 | int ret_val; | |
1078 | u32 iter; | |
1079 | ||
1080 | for (iter = 0; iter < net_cat_len; iter += 2) { | |
16efd454 | 1081 | ret_val = netlbl_secattr_catmap_setbit(secattr->attr.mls.cat, |
d3e2ce3b | 1082 | get_unaligned_be16(&net_cat[iter]), |
50e5d35c | 1083 | GFP_ATOMIC); |
654bbc2a PM |
1084 | if (ret_val != 0) |
1085 | return ret_val; | |
1086 | } | |
1087 | ||
1088 | return 0; | |
1089 | } | |
1090 | ||
484b3669 PM |
1091 | /** |
1092 | * cipso_v4_map_cat_rng_valid - Checks to see if the categories are valid | |
1093 | * @doi_def: the DOI definition | |
1094 | * @rngcat: category list | |
1095 | * @rngcat_len: length of the category list in bytes | |
1096 | * | |
1097 | * Description: | |
1098 | * Checks the given categories against the given DOI definition and returns a | |
1099 | * negative value if any of the categories do not have a valid mapping and a | |
1100 | * zero value if all of the categories are valid. | |
1101 | * | |
1102 | */ | |
1103 | static int cipso_v4_map_cat_rng_valid(const struct cipso_v4_doi *doi_def, | |
1104 | const unsigned char *rngcat, | |
1105 | u32 rngcat_len) | |
1106 | { | |
1107 | u16 cat_high; | |
1108 | u16 cat_low; | |
1109 | u32 cat_prev = CIPSO_V4_MAX_REM_CATS + 1; | |
1110 | u32 iter; | |
1111 | ||
1112 | if (doi_def->type != CIPSO_V4_MAP_PASS || rngcat_len & 0x01) | |
1113 | return -EFAULT; | |
1114 | ||
1115 | for (iter = 0; iter < rngcat_len; iter += 4) { | |
d3e2ce3b | 1116 | cat_high = get_unaligned_be16(&rngcat[iter]); |
484b3669 | 1117 | if ((iter + 4) <= rngcat_len) |
d3e2ce3b | 1118 | cat_low = get_unaligned_be16(&rngcat[iter + 2]); |
484b3669 PM |
1119 | else |
1120 | cat_low = 0; | |
1121 | ||
1122 | if (cat_high > cat_prev) | |
1123 | return -EFAULT; | |
1124 | ||
1125 | cat_prev = cat_low; | |
1126 | } | |
1127 | ||
1128 | return 0; | |
1129 | } | |
1130 | ||
1131 | /** | |
1132 | * cipso_v4_map_cat_rng_hton - Perform a category mapping from host to network | |
1133 | * @doi_def: the DOI definition | |
1134 | * @secattr: the security attributes | |
1135 | * @net_cat: the zero'd out category list in network/CIPSO format | |
1136 | * @net_cat_len: the length of the CIPSO category list in bytes | |
1137 | * | |
1138 | * Description: | |
1139 | * Perform a label mapping to translate a local MLS category bitmap to the | |
1140 | * correct CIPSO category list using the given DOI definition. Returns the | |
1141 | * size in bytes of the network category bitmap on success, negative values | |
1142 | * otherwise. | |
1143 | * | |
1144 | */ | |
1145 | static int cipso_v4_map_cat_rng_hton(const struct cipso_v4_doi *doi_def, | |
1146 | const struct netlbl_lsm_secattr *secattr, | |
1147 | unsigned char *net_cat, | |
1148 | u32 net_cat_len) | |
1149 | { | |
484b3669 | 1150 | int iter = -1; |
f998e8cb | 1151 | u16 array[CIPSO_V4_TAG_RNG_CAT_MAX * 2]; |
484b3669 PM |
1152 | u32 array_cnt = 0; |
1153 | u32 cat_size = 0; | |
1154 | ||
f998e8cb | 1155 | /* make sure we don't overflow the 'array[]' variable */ |
128c6b6c PM |
1156 | if (net_cat_len > |
1157 | (CIPSO_V4_OPT_LEN_MAX - CIPSO_V4_HDR_LEN - CIPSO_V4_TAG_RNG_BLEN)) | |
1158 | return -ENOSPC; | |
484b3669 PM |
1159 | |
1160 | for (;;) { | |
16efd454 PM |
1161 | iter = netlbl_secattr_catmap_walk(secattr->attr.mls.cat, |
1162 | iter + 1); | |
484b3669 PM |
1163 | if (iter < 0) |
1164 | break; | |
1165 | cat_size += (iter == 0 ? 0 : sizeof(u16)); | |
1166 | if (cat_size > net_cat_len) | |
1167 | return -ENOSPC; | |
1168 | array[array_cnt++] = iter; | |
1169 | ||
16efd454 PM |
1170 | iter = netlbl_secattr_catmap_walk_rng(secattr->attr.mls.cat, |
1171 | iter); | |
484b3669 PM |
1172 | if (iter < 0) |
1173 | return -EFAULT; | |
1174 | cat_size += sizeof(u16); | |
1175 | if (cat_size > net_cat_len) | |
1176 | return -ENOSPC; | |
1177 | array[array_cnt++] = iter; | |
1178 | } | |
1179 | ||
1180 | for (iter = 0; array_cnt > 0;) { | |
1181 | *((__be16 *)&net_cat[iter]) = htons(array[--array_cnt]); | |
1182 | iter += 2; | |
1183 | array_cnt--; | |
1184 | if (array[array_cnt] != 0) { | |
1185 | *((__be16 *)&net_cat[iter]) = htons(array[array_cnt]); | |
1186 | iter += 2; | |
1187 | } | |
1188 | } | |
1189 | ||
1190 | return cat_size; | |
1191 | } | |
1192 | ||
1193 | /** | |
1194 | * cipso_v4_map_cat_rng_ntoh - Perform a category mapping from network to host | |
1195 | * @doi_def: the DOI definition | |
1196 | * @net_cat: the category list in network/CIPSO format | |
1197 | * @net_cat_len: the length of the CIPSO bitmap in bytes | |
1198 | * @secattr: the security attributes | |
1199 | * | |
1200 | * Description: | |
1201 | * Perform a label mapping to translate a CIPSO category list to the correct | |
1202 | * local MLS category bitmap using the given DOI definition. Returns zero on | |
1203 | * success, negative values on failure. | |
1204 | * | |
1205 | */ | |
1206 | static int cipso_v4_map_cat_rng_ntoh(const struct cipso_v4_doi *doi_def, | |
1207 | const unsigned char *net_cat, | |
1208 | u32 net_cat_len, | |
1209 | struct netlbl_lsm_secattr *secattr) | |
1210 | { | |
1211 | int ret_val; | |
1212 | u32 net_iter; | |
1213 | u16 cat_low; | |
1214 | u16 cat_high; | |
1215 | ||
132adf54 | 1216 | for (net_iter = 0; net_iter < net_cat_len; net_iter += 4) { |
d3e2ce3b | 1217 | cat_high = get_unaligned_be16(&net_cat[net_iter]); |
484b3669 | 1218 | if ((net_iter + 4) <= net_cat_len) |
d3e2ce3b | 1219 | cat_low = get_unaligned_be16(&net_cat[net_iter + 2]); |
484b3669 PM |
1220 | else |
1221 | cat_low = 0; | |
1222 | ||
16efd454 | 1223 | ret_val = netlbl_secattr_catmap_setrng(secattr->attr.mls.cat, |
484b3669 PM |
1224 | cat_low, |
1225 | cat_high, | |
1226 | GFP_ATOMIC); | |
1227 | if (ret_val != 0) | |
1228 | return ret_val; | |
1229 | } | |
1230 | ||
1231 | return 0; | |
1232 | } | |
1233 | ||
446fda4f PM |
1234 | /* |
1235 | * Protocol Handling Functions | |
1236 | */ | |
1237 | ||
446fda4f PM |
1238 | /** |
1239 | * cipso_v4_gentag_hdr - Generate a CIPSO option header | |
1240 | * @doi_def: the DOI definition | |
91b1ed0a | 1241 | * @len: the total tag length in bytes, not including this header |
446fda4f PM |
1242 | * @buf: the CIPSO option buffer |
1243 | * | |
1244 | * Description: | |
91b1ed0a | 1245 | * Write a CIPSO header into the beginning of @buffer. |
446fda4f PM |
1246 | * |
1247 | */ | |
91b1ed0a PM |
1248 | static void cipso_v4_gentag_hdr(const struct cipso_v4_doi *doi_def, |
1249 | unsigned char *buf, | |
1250 | u32 len) | |
446fda4f | 1251 | { |
446fda4f PM |
1252 | buf[0] = IPOPT_CIPSO; |
1253 | buf[1] = CIPSO_V4_HDR_LEN + len; | |
714e85be | 1254 | *(__be32 *)&buf[2] = htonl(doi_def->doi); |
446fda4f PM |
1255 | } |
1256 | ||
446fda4f PM |
1257 | /** |
1258 | * cipso_v4_gentag_rbm - Generate a CIPSO restricted bitmap tag (type #1) | |
1259 | * @doi_def: the DOI definition | |
1260 | * @secattr: the security attributes | |
1261 | * @buffer: the option buffer | |
1262 | * @buffer_len: length of buffer in bytes | |
1263 | * | |
1264 | * Description: | |
1265 | * Generate a CIPSO option using the restricted bitmap tag, tag type #1. The | |
1266 | * actual buffer length may be larger than the indicated size due to | |
91b1ed0a PM |
1267 | * translation between host and network category bitmaps. Returns the size of |
1268 | * the tag on success, negative values on failure. | |
446fda4f PM |
1269 | * |
1270 | */ | |
1271 | static int cipso_v4_gentag_rbm(const struct cipso_v4_doi *doi_def, | |
1272 | const struct netlbl_lsm_secattr *secattr, | |
91b1ed0a PM |
1273 | unsigned char *buffer, |
1274 | u32 buffer_len) | |
446fda4f | 1275 | { |
701a90ba | 1276 | int ret_val; |
91b1ed0a | 1277 | u32 tag_len; |
446fda4f PM |
1278 | u32 level; |
1279 | ||
701a90ba PM |
1280 | if ((secattr->flags & NETLBL_SECATTR_MLS_LVL) == 0) |
1281 | return -EPERM; | |
1282 | ||
16efd454 PM |
1283 | ret_val = cipso_v4_map_lvl_hton(doi_def, |
1284 | secattr->attr.mls.lvl, | |
1285 | &level); | |
91b1ed0a PM |
1286 | if (ret_val != 0) |
1287 | return ret_val; | |
446fda4f | 1288 | |
91b1ed0a | 1289 | if (secattr->flags & NETLBL_SECATTR_MLS_CAT) { |
446fda4f | 1290 | ret_val = cipso_v4_map_cat_rbm_hton(doi_def, |
02752760 | 1291 | secattr, |
91b1ed0a PM |
1292 | &buffer[4], |
1293 | buffer_len - 4); | |
446fda4f | 1294 | if (ret_val < 0) |
91b1ed0a | 1295 | return ret_val; |
446fda4f PM |
1296 | |
1297 | /* This will send packets using the "optimized" format when | |
1298 | * possibile as specified in section 3.4.2.6 of the | |
1299 | * CIPSO draft. */ | |
701a90ba | 1300 | if (cipso_v4_rbm_optfmt && ret_val > 0 && ret_val <= 10) |
91b1ed0a | 1301 | tag_len = 14; |
701a90ba | 1302 | else |
91b1ed0a PM |
1303 | tag_len = 4 + ret_val; |
1304 | } else | |
1305 | tag_len = 4; | |
446fda4f | 1306 | |
15c45f7b | 1307 | buffer[0] = CIPSO_V4_TAG_RBITMAP; |
91b1ed0a PM |
1308 | buffer[1] = tag_len; |
1309 | buffer[3] = level; | |
446fda4f | 1310 | |
91b1ed0a | 1311 | return tag_len; |
446fda4f PM |
1312 | } |
1313 | ||
1314 | /** | |
1315 | * cipso_v4_parsetag_rbm - Parse a CIPSO restricted bitmap tag | |
1316 | * @doi_def: the DOI definition | |
1317 | * @tag: the CIPSO tag | |
1318 | * @secattr: the security attributes | |
1319 | * | |
1320 | * Description: | |
1321 | * Parse a CIPSO restricted bitmap tag (tag type #1) and return the security | |
1322 | * attributes in @secattr. Return zero on success, negatives values on | |
1323 | * failure. | |
1324 | * | |
1325 | */ | |
1326 | static int cipso_v4_parsetag_rbm(const struct cipso_v4_doi *doi_def, | |
1327 | const unsigned char *tag, | |
1328 | struct netlbl_lsm_secattr *secattr) | |
1329 | { | |
1330 | int ret_val; | |
1331 | u8 tag_len = tag[1]; | |
1332 | u32 level; | |
1333 | ||
1334 | ret_val = cipso_v4_map_lvl_ntoh(doi_def, tag[3], &level); | |
1335 | if (ret_val != 0) | |
1336 | return ret_val; | |
16efd454 | 1337 | secattr->attr.mls.lvl = level; |
701a90ba | 1338 | secattr->flags |= NETLBL_SECATTR_MLS_LVL; |
446fda4f PM |
1339 | |
1340 | if (tag_len > 4) { | |
16efd454 PM |
1341 | secattr->attr.mls.cat = |
1342 | netlbl_secattr_catmap_alloc(GFP_ATOMIC); | |
1343 | if (secattr->attr.mls.cat == NULL) | |
446fda4f PM |
1344 | return -ENOMEM; |
1345 | ||
1346 | ret_val = cipso_v4_map_cat_rbm_ntoh(doi_def, | |
1347 | &tag[4], | |
1348 | tag_len - 4, | |
02752760 PM |
1349 | secattr); |
1350 | if (ret_val != 0) { | |
16efd454 | 1351 | netlbl_secattr_catmap_free(secattr->attr.mls.cat); |
446fda4f PM |
1352 | return ret_val; |
1353 | } | |
02752760 PM |
1354 | |
1355 | secattr->flags |= NETLBL_SECATTR_MLS_CAT; | |
446fda4f PM |
1356 | } |
1357 | ||
1358 | return 0; | |
1359 | } | |
1360 | ||
654bbc2a PM |
1361 | /** |
1362 | * cipso_v4_gentag_enum - Generate a CIPSO enumerated tag (type #2) | |
1363 | * @doi_def: the DOI definition | |
1364 | * @secattr: the security attributes | |
1365 | * @buffer: the option buffer | |
1366 | * @buffer_len: length of buffer in bytes | |
1367 | * | |
1368 | * Description: | |
1369 | * Generate a CIPSO option using the enumerated tag, tag type #2. Returns the | |
1370 | * size of the tag on success, negative values on failure. | |
1371 | * | |
1372 | */ | |
1373 | static int cipso_v4_gentag_enum(const struct cipso_v4_doi *doi_def, | |
1374 | const struct netlbl_lsm_secattr *secattr, | |
1375 | unsigned char *buffer, | |
1376 | u32 buffer_len) | |
1377 | { | |
1378 | int ret_val; | |
1379 | u32 tag_len; | |
1380 | u32 level; | |
1381 | ||
1382 | if (!(secattr->flags & NETLBL_SECATTR_MLS_LVL)) | |
1383 | return -EPERM; | |
1384 | ||
16efd454 PM |
1385 | ret_val = cipso_v4_map_lvl_hton(doi_def, |
1386 | secattr->attr.mls.lvl, | |
1387 | &level); | |
654bbc2a PM |
1388 | if (ret_val != 0) |
1389 | return ret_val; | |
1390 | ||
1391 | if (secattr->flags & NETLBL_SECATTR_MLS_CAT) { | |
1392 | ret_val = cipso_v4_map_cat_enum_hton(doi_def, | |
1393 | secattr, | |
1394 | &buffer[4], | |
1395 | buffer_len - 4); | |
1396 | if (ret_val < 0) | |
1397 | return ret_val; | |
1398 | ||
1399 | tag_len = 4 + ret_val; | |
1400 | } else | |
1401 | tag_len = 4; | |
1402 | ||
15c45f7b | 1403 | buffer[0] = CIPSO_V4_TAG_ENUM; |
654bbc2a PM |
1404 | buffer[1] = tag_len; |
1405 | buffer[3] = level; | |
1406 | ||
1407 | return tag_len; | |
1408 | } | |
1409 | ||
1410 | /** | |
1411 | * cipso_v4_parsetag_enum - Parse a CIPSO enumerated tag | |
1412 | * @doi_def: the DOI definition | |
1413 | * @tag: the CIPSO tag | |
1414 | * @secattr: the security attributes | |
1415 | * | |
1416 | * Description: | |
1417 | * Parse a CIPSO enumerated tag (tag type #2) and return the security | |
1418 | * attributes in @secattr. Return zero on success, negatives values on | |
1419 | * failure. | |
1420 | * | |
1421 | */ | |
1422 | static int cipso_v4_parsetag_enum(const struct cipso_v4_doi *doi_def, | |
1423 | const unsigned char *tag, | |
1424 | struct netlbl_lsm_secattr *secattr) | |
1425 | { | |
1426 | int ret_val; | |
1427 | u8 tag_len = tag[1]; | |
1428 | u32 level; | |
1429 | ||
1430 | ret_val = cipso_v4_map_lvl_ntoh(doi_def, tag[3], &level); | |
1431 | if (ret_val != 0) | |
1432 | return ret_val; | |
16efd454 | 1433 | secattr->attr.mls.lvl = level; |
654bbc2a PM |
1434 | secattr->flags |= NETLBL_SECATTR_MLS_LVL; |
1435 | ||
1436 | if (tag_len > 4) { | |
16efd454 PM |
1437 | secattr->attr.mls.cat = |
1438 | netlbl_secattr_catmap_alloc(GFP_ATOMIC); | |
1439 | if (secattr->attr.mls.cat == NULL) | |
654bbc2a PM |
1440 | return -ENOMEM; |
1441 | ||
1442 | ret_val = cipso_v4_map_cat_enum_ntoh(doi_def, | |
1443 | &tag[4], | |
1444 | tag_len - 4, | |
1445 | secattr); | |
1446 | if (ret_val != 0) { | |
16efd454 | 1447 | netlbl_secattr_catmap_free(secattr->attr.mls.cat); |
654bbc2a PM |
1448 | return ret_val; |
1449 | } | |
1450 | ||
1451 | secattr->flags |= NETLBL_SECATTR_MLS_CAT; | |
1452 | } | |
1453 | ||
1454 | return 0; | |
1455 | } | |
1456 | ||
484b3669 PM |
1457 | /** |
1458 | * cipso_v4_gentag_rng - Generate a CIPSO ranged tag (type #5) | |
1459 | * @doi_def: the DOI definition | |
1460 | * @secattr: the security attributes | |
1461 | * @buffer: the option buffer | |
1462 | * @buffer_len: length of buffer in bytes | |
1463 | * | |
1464 | * Description: | |
1465 | * Generate a CIPSO option using the ranged tag, tag type #5. Returns the | |
1466 | * size of the tag on success, negative values on failure. | |
1467 | * | |
1468 | */ | |
1469 | static int cipso_v4_gentag_rng(const struct cipso_v4_doi *doi_def, | |
1470 | const struct netlbl_lsm_secattr *secattr, | |
1471 | unsigned char *buffer, | |
1472 | u32 buffer_len) | |
1473 | { | |
1474 | int ret_val; | |
1475 | u32 tag_len; | |
1476 | u32 level; | |
1477 | ||
1478 | if (!(secattr->flags & NETLBL_SECATTR_MLS_LVL)) | |
1479 | return -EPERM; | |
1480 | ||
16efd454 PM |
1481 | ret_val = cipso_v4_map_lvl_hton(doi_def, |
1482 | secattr->attr.mls.lvl, | |
1483 | &level); | |
484b3669 PM |
1484 | if (ret_val != 0) |
1485 | return ret_val; | |
1486 | ||
1487 | if (secattr->flags & NETLBL_SECATTR_MLS_CAT) { | |
1488 | ret_val = cipso_v4_map_cat_rng_hton(doi_def, | |
1489 | secattr, | |
1490 | &buffer[4], | |
1491 | buffer_len - 4); | |
1492 | if (ret_val < 0) | |
1493 | return ret_val; | |
1494 | ||
1495 | tag_len = 4 + ret_val; | |
1496 | } else | |
1497 | tag_len = 4; | |
1498 | ||
15c45f7b | 1499 | buffer[0] = CIPSO_V4_TAG_RANGE; |
484b3669 PM |
1500 | buffer[1] = tag_len; |
1501 | buffer[3] = level; | |
1502 | ||
1503 | return tag_len; | |
1504 | } | |
1505 | ||
1506 | /** | |
1507 | * cipso_v4_parsetag_rng - Parse a CIPSO ranged tag | |
1508 | * @doi_def: the DOI definition | |
1509 | * @tag: the CIPSO tag | |
1510 | * @secattr: the security attributes | |
1511 | * | |
1512 | * Description: | |
1513 | * Parse a CIPSO ranged tag (tag type #5) and return the security attributes | |
1514 | * in @secattr. Return zero on success, negatives values on failure. | |
1515 | * | |
1516 | */ | |
1517 | static int cipso_v4_parsetag_rng(const struct cipso_v4_doi *doi_def, | |
1518 | const unsigned char *tag, | |
1519 | struct netlbl_lsm_secattr *secattr) | |
1520 | { | |
1521 | int ret_val; | |
1522 | u8 tag_len = tag[1]; | |
1523 | u32 level; | |
1524 | ||
1525 | ret_val = cipso_v4_map_lvl_ntoh(doi_def, tag[3], &level); | |
1526 | if (ret_val != 0) | |
1527 | return ret_val; | |
16efd454 | 1528 | secattr->attr.mls.lvl = level; |
484b3669 PM |
1529 | secattr->flags |= NETLBL_SECATTR_MLS_LVL; |
1530 | ||
1531 | if (tag_len > 4) { | |
16efd454 PM |
1532 | secattr->attr.mls.cat = |
1533 | netlbl_secattr_catmap_alloc(GFP_ATOMIC); | |
1534 | if (secattr->attr.mls.cat == NULL) | |
484b3669 PM |
1535 | return -ENOMEM; |
1536 | ||
1537 | ret_val = cipso_v4_map_cat_rng_ntoh(doi_def, | |
1538 | &tag[4], | |
1539 | tag_len - 4, | |
1540 | secattr); | |
1541 | if (ret_val != 0) { | |
16efd454 | 1542 | netlbl_secattr_catmap_free(secattr->attr.mls.cat); |
484b3669 PM |
1543 | return ret_val; |
1544 | } | |
1545 | ||
1546 | secattr->flags |= NETLBL_SECATTR_MLS_CAT; | |
1547 | } | |
1548 | ||
1549 | return 0; | |
1550 | } | |
1551 | ||
15c45f7b PM |
1552 | /** |
1553 | * cipso_v4_gentag_loc - Generate a CIPSO local tag (non-standard) | |
1554 | * @doi_def: the DOI definition | |
1555 | * @secattr: the security attributes | |
1556 | * @buffer: the option buffer | |
1557 | * @buffer_len: length of buffer in bytes | |
1558 | * | |
1559 | * Description: | |
1560 | * Generate a CIPSO option using the local tag. Returns the size of the tag | |
1561 | * on success, negative values on failure. | |
1562 | * | |
1563 | */ | |
1564 | static int cipso_v4_gentag_loc(const struct cipso_v4_doi *doi_def, | |
1565 | const struct netlbl_lsm_secattr *secattr, | |
1566 | unsigned char *buffer, | |
1567 | u32 buffer_len) | |
1568 | { | |
1569 | if (!(secattr->flags & NETLBL_SECATTR_SECID)) | |
1570 | return -EPERM; | |
1571 | ||
1572 | buffer[0] = CIPSO_V4_TAG_LOCAL; | |
1573 | buffer[1] = CIPSO_V4_TAG_LOC_BLEN; | |
1574 | *(u32 *)&buffer[2] = secattr->attr.secid; | |
1575 | ||
1576 | return CIPSO_V4_TAG_LOC_BLEN; | |
1577 | } | |
1578 | ||
1579 | /** | |
1580 | * cipso_v4_parsetag_loc - Parse a CIPSO local tag | |
1581 | * @doi_def: the DOI definition | |
1582 | * @tag: the CIPSO tag | |
1583 | * @secattr: the security attributes | |
1584 | * | |
1585 | * Description: | |
1586 | * Parse a CIPSO local tag and return the security attributes in @secattr. | |
1587 | * Return zero on success, negatives values on failure. | |
1588 | * | |
1589 | */ | |
1590 | static int cipso_v4_parsetag_loc(const struct cipso_v4_doi *doi_def, | |
1591 | const unsigned char *tag, | |
1592 | struct netlbl_lsm_secattr *secattr) | |
1593 | { | |
1594 | secattr->attr.secid = *(u32 *)&tag[2]; | |
1595 | secattr->flags |= NETLBL_SECATTR_SECID; | |
1596 | ||
1597 | return 0; | |
1598 | } | |
1599 | ||
446fda4f PM |
1600 | /** |
1601 | * cipso_v4_validate - Validate a CIPSO option | |
1602 | * @option: the start of the option, on error it is set to point to the error | |
1603 | * | |
1604 | * Description: | |
1605 | * This routine is called to validate a CIPSO option, it checks all of the | |
1606 | * fields to ensure that they are at least valid, see the draft snippet below | |
1607 | * for details. If the option is valid then a zero value is returned and | |
1608 | * the value of @option is unchanged. If the option is invalid then a | |
1609 | * non-zero value is returned and @option is adjusted to point to the | |
1610 | * offending portion of the option. From the IETF draft ... | |
1611 | * | |
1612 | * "If any field within the CIPSO options, such as the DOI identifier, is not | |
1613 | * recognized the IP datagram is discarded and an ICMP 'parameter problem' | |
1614 | * (type 12) is generated and returned. The ICMP code field is set to 'bad | |
1615 | * parameter' (code 0) and the pointer is set to the start of the CIPSO field | |
1616 | * that is unrecognized." | |
1617 | * | |
1618 | */ | |
15c45f7b | 1619 | int cipso_v4_validate(const struct sk_buff *skb, unsigned char **option) |
446fda4f PM |
1620 | { |
1621 | unsigned char *opt = *option; | |
1622 | unsigned char *tag; | |
1623 | unsigned char opt_iter; | |
1624 | unsigned char err_offset = 0; | |
1625 | u8 opt_len; | |
1626 | u8 tag_len; | |
1627 | struct cipso_v4_doi *doi_def = NULL; | |
1628 | u32 tag_iter; | |
1629 | ||
1630 | /* caller already checks for length values that are too large */ | |
1631 | opt_len = opt[1]; | |
1632 | if (opt_len < 8) { | |
1633 | err_offset = 1; | |
1634 | goto validate_return; | |
1635 | } | |
1636 | ||
1637 | rcu_read_lock(); | |
d3e2ce3b | 1638 | doi_def = cipso_v4_doi_search(get_unaligned_be32(&opt[2])); |
446fda4f PM |
1639 | if (doi_def == NULL) { |
1640 | err_offset = 2; | |
1641 | goto validate_return_locked; | |
1642 | } | |
1643 | ||
15c45f7b | 1644 | opt_iter = CIPSO_V4_HDR_LEN; |
446fda4f PM |
1645 | tag = opt + opt_iter; |
1646 | while (opt_iter < opt_len) { | |
1647 | for (tag_iter = 0; doi_def->tags[tag_iter] != tag[0];) | |
1648 | if (doi_def->tags[tag_iter] == CIPSO_V4_TAG_INVALID || | |
1649 | ++tag_iter == CIPSO_V4_TAG_MAXCNT) { | |
1650 | err_offset = opt_iter; | |
1651 | goto validate_return_locked; | |
1652 | } | |
1653 | ||
1654 | tag_len = tag[1]; | |
1655 | if (tag_len > (opt_len - opt_iter)) { | |
1656 | err_offset = opt_iter + 1; | |
1657 | goto validate_return_locked; | |
1658 | } | |
1659 | ||
1660 | switch (tag[0]) { | |
1661 | case CIPSO_V4_TAG_RBITMAP: | |
15c45f7b | 1662 | if (tag_len < CIPSO_V4_TAG_RBM_BLEN) { |
446fda4f PM |
1663 | err_offset = opt_iter + 1; |
1664 | goto validate_return_locked; | |
1665 | } | |
1666 | ||
1667 | /* We are already going to do all the verification | |
1668 | * necessary at the socket layer so from our point of | |
1669 | * view it is safe to turn these checks off (and less | |
1670 | * work), however, the CIPSO draft says we should do | |
1671 | * all the CIPSO validations here but it doesn't | |
1672 | * really specify _exactly_ what we need to validate | |
1673 | * ... so, just make it a sysctl tunable. */ | |
1674 | if (cipso_v4_rbm_strictvalid) { | |
1675 | if (cipso_v4_map_lvl_valid(doi_def, | |
1676 | tag[3]) < 0) { | |
1677 | err_offset = opt_iter + 3; | |
1678 | goto validate_return_locked; | |
1679 | } | |
15c45f7b | 1680 | if (tag_len > CIPSO_V4_TAG_RBM_BLEN && |
446fda4f PM |
1681 | cipso_v4_map_cat_rbm_valid(doi_def, |
1682 | &tag[4], | |
1683 | tag_len - 4) < 0) { | |
1684 | err_offset = opt_iter + 4; | |
1685 | goto validate_return_locked; | |
1686 | } | |
1687 | } | |
1688 | break; | |
654bbc2a | 1689 | case CIPSO_V4_TAG_ENUM: |
15c45f7b | 1690 | if (tag_len < CIPSO_V4_TAG_ENUM_BLEN) { |
654bbc2a PM |
1691 | err_offset = opt_iter + 1; |
1692 | goto validate_return_locked; | |
1693 | } | |
1694 | ||
1695 | if (cipso_v4_map_lvl_valid(doi_def, | |
1696 | tag[3]) < 0) { | |
1697 | err_offset = opt_iter + 3; | |
1698 | goto validate_return_locked; | |
1699 | } | |
15c45f7b | 1700 | if (tag_len > CIPSO_V4_TAG_ENUM_BLEN && |
654bbc2a PM |
1701 | cipso_v4_map_cat_enum_valid(doi_def, |
1702 | &tag[4], | |
1703 | tag_len - 4) < 0) { | |
1704 | err_offset = opt_iter + 4; | |
1705 | goto validate_return_locked; | |
1706 | } | |
1707 | break; | |
484b3669 | 1708 | case CIPSO_V4_TAG_RANGE: |
15c45f7b | 1709 | if (tag_len < CIPSO_V4_TAG_RNG_BLEN) { |
484b3669 PM |
1710 | err_offset = opt_iter + 1; |
1711 | goto validate_return_locked; | |
1712 | } | |
1713 | ||
1714 | if (cipso_v4_map_lvl_valid(doi_def, | |
1715 | tag[3]) < 0) { | |
1716 | err_offset = opt_iter + 3; | |
1717 | goto validate_return_locked; | |
1718 | } | |
15c45f7b | 1719 | if (tag_len > CIPSO_V4_TAG_RNG_BLEN && |
484b3669 PM |
1720 | cipso_v4_map_cat_rng_valid(doi_def, |
1721 | &tag[4], | |
1722 | tag_len - 4) < 0) { | |
1723 | err_offset = opt_iter + 4; | |
1724 | goto validate_return_locked; | |
1725 | } | |
1726 | break; | |
15c45f7b PM |
1727 | case CIPSO_V4_TAG_LOCAL: |
1728 | /* This is a non-standard tag that we only allow for | |
1729 | * local connections, so if the incoming interface is | |
1730 | * not the loopback device drop the packet. */ | |
1731 | if (!(skb->dev->flags & IFF_LOOPBACK)) { | |
1732 | err_offset = opt_iter; | |
1733 | goto validate_return_locked; | |
1734 | } | |
1735 | if (tag_len != CIPSO_V4_TAG_LOC_BLEN) { | |
1736 | err_offset = opt_iter + 1; | |
1737 | goto validate_return_locked; | |
1738 | } | |
1739 | break; | |
446fda4f PM |
1740 | default: |
1741 | err_offset = opt_iter; | |
1742 | goto validate_return_locked; | |
1743 | } | |
1744 | ||
1745 | tag += tag_len; | |
1746 | opt_iter += tag_len; | |
1747 | } | |
1748 | ||
1749 | validate_return_locked: | |
1750 | rcu_read_unlock(); | |
1751 | validate_return: | |
1752 | *option = opt + err_offset; | |
1753 | return err_offset; | |
1754 | } | |
1755 | ||
1756 | /** | |
1757 | * cipso_v4_error - Send the correct reponse for a bad packet | |
1758 | * @skb: the packet | |
1759 | * @error: the error code | |
1760 | * @gateway: CIPSO gateway flag | |
1761 | * | |
1762 | * Description: | |
1763 | * Based on the error code given in @error, send an ICMP error message back to | |
1764 | * the originating host. From the IETF draft ... | |
1765 | * | |
1766 | * "If the contents of the CIPSO [option] are valid but the security label is | |
1767 | * outside of the configured host or port label range, the datagram is | |
1768 | * discarded and an ICMP 'destination unreachable' (type 3) is generated and | |
1769 | * returned. The code field of the ICMP is set to 'communication with | |
1770 | * destination network administratively prohibited' (code 9) or to | |
1771 | * 'communication with destination host administratively prohibited' | |
1772 | * (code 10). The value of the code is dependent on whether the originator | |
1773 | * of the ICMP message is acting as a CIPSO host or a CIPSO gateway. The | |
1774 | * recipient of the ICMP message MUST be able to handle either value. The | |
1775 | * same procedure is performed if a CIPSO [option] can not be added to an | |
1776 | * IP packet because it is too large to fit in the IP options area." | |
1777 | * | |
1778 | * "If the error is triggered by receipt of an ICMP message, the message is | |
1779 | * discarded and no response is permitted (consistent with general ICMP | |
1780 | * processing rules)." | |
1781 | * | |
1782 | */ | |
1783 | void cipso_v4_error(struct sk_buff *skb, int error, u32 gateway) | |
1784 | { | |
eddc9ec5 | 1785 | if (ip_hdr(skb)->protocol == IPPROTO_ICMP || error != -EACCES) |
446fda4f PM |
1786 | return; |
1787 | ||
1788 | if (gateway) | |
1789 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_NET_ANO, 0); | |
1790 | else | |
1791 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_ANO, 0); | |
1792 | } | |
1793 | ||
1794 | /** | |
948bf85c PM |
1795 | * cipso_v4_genopt - Generate a CIPSO option |
1796 | * @buf: the option buffer | |
1797 | * @buf_len: the size of opt_buf | |
446fda4f | 1798 | * @doi_def: the CIPSO DOI to use |
948bf85c | 1799 | * @secattr: the security attributes |
446fda4f PM |
1800 | * |
1801 | * Description: | |
948bf85c PM |
1802 | * Generate a CIPSO option using the DOI definition and security attributes |
1803 | * passed to the function. Returns the length of the option on success and | |
1804 | * negative values on failure. | |
446fda4f PM |
1805 | * |
1806 | */ | |
948bf85c PM |
1807 | static int cipso_v4_genopt(unsigned char *buf, u32 buf_len, |
1808 | const struct cipso_v4_doi *doi_def, | |
1809 | const struct netlbl_lsm_secattr *secattr) | |
446fda4f | 1810 | { |
948bf85c | 1811 | int ret_val; |
446fda4f | 1812 | u32 iter; |
446fda4f | 1813 | |
948bf85c PM |
1814 | if (buf_len <= CIPSO_V4_HDR_LEN) |
1815 | return -ENOSPC; | |
91b1ed0a | 1816 | |
446fda4f PM |
1817 | /* XXX - This code assumes only one tag per CIPSO option which isn't |
1818 | * really a good assumption to make but since we only support the MAC | |
1819 | * tags right now it is a safe assumption. */ | |
1820 | iter = 0; | |
1821 | do { | |
91b1ed0a | 1822 | memset(buf, 0, buf_len); |
446fda4f PM |
1823 | switch (doi_def->tags[iter]) { |
1824 | case CIPSO_V4_TAG_RBITMAP: | |
1825 | ret_val = cipso_v4_gentag_rbm(doi_def, | |
91b1ed0a PM |
1826 | secattr, |
1827 | &buf[CIPSO_V4_HDR_LEN], | |
1828 | buf_len - CIPSO_V4_HDR_LEN); | |
446fda4f | 1829 | break; |
654bbc2a PM |
1830 | case CIPSO_V4_TAG_ENUM: |
1831 | ret_val = cipso_v4_gentag_enum(doi_def, | |
1832 | secattr, | |
1833 | &buf[CIPSO_V4_HDR_LEN], | |
1834 | buf_len - CIPSO_V4_HDR_LEN); | |
1835 | break; | |
484b3669 PM |
1836 | case CIPSO_V4_TAG_RANGE: |
1837 | ret_val = cipso_v4_gentag_rng(doi_def, | |
1838 | secattr, | |
1839 | &buf[CIPSO_V4_HDR_LEN], | |
1840 | buf_len - CIPSO_V4_HDR_LEN); | |
1841 | break; | |
15c45f7b PM |
1842 | case CIPSO_V4_TAG_LOCAL: |
1843 | ret_val = cipso_v4_gentag_loc(doi_def, | |
1844 | secattr, | |
1845 | &buf[CIPSO_V4_HDR_LEN], | |
1846 | buf_len - CIPSO_V4_HDR_LEN); | |
1847 | break; | |
446fda4f | 1848 | default: |
948bf85c | 1849 | return -EPERM; |
446fda4f PM |
1850 | } |
1851 | ||
1852 | iter++; | |
91b1ed0a | 1853 | } while (ret_val < 0 && |
446fda4f PM |
1854 | iter < CIPSO_V4_TAG_MAXCNT && |
1855 | doi_def->tags[iter] != CIPSO_V4_TAG_INVALID); | |
91b1ed0a | 1856 | if (ret_val < 0) |
948bf85c | 1857 | return ret_val; |
91b1ed0a | 1858 | cipso_v4_gentag_hdr(doi_def, buf, ret_val); |
948bf85c PM |
1859 | return CIPSO_V4_HDR_LEN + ret_val; |
1860 | } | |
1861 | ||
1862 | /** | |
1863 | * cipso_v4_sock_setattr - Add a CIPSO option to a socket | |
1864 | * @sk: the socket | |
1865 | * @doi_def: the CIPSO DOI to use | |
1866 | * @secattr: the specific security attributes of the socket | |
1867 | * | |
1868 | * Description: | |
1869 | * Set the CIPSO option on the given socket using the DOI definition and | |
1870 | * security attributes passed to the function. This function requires | |
1871 | * exclusive access to @sk, which means it either needs to be in the | |
1872 | * process of being created or locked. Returns zero on success and negative | |
1873 | * values on failure. | |
1874 | * | |
1875 | */ | |
1876 | int cipso_v4_sock_setattr(struct sock *sk, | |
1877 | const struct cipso_v4_doi *doi_def, | |
1878 | const struct netlbl_lsm_secattr *secattr) | |
1879 | { | |
1880 | int ret_val = -EPERM; | |
1881 | unsigned char *buf = NULL; | |
1882 | u32 buf_len; | |
1883 | u32 opt_len; | |
1884 | struct ip_options *opt = NULL; | |
1885 | struct inet_sock *sk_inet; | |
1886 | struct inet_connection_sock *sk_conn; | |
1887 | ||
1888 | /* In the case of sock_create_lite(), the sock->sk field is not | |
1889 | * defined yet but it is not a problem as the only users of these | |
1890 | * "lite" PF_INET sockets are functions which do an accept() call | |
1891 | * afterwards so we will label the socket as part of the accept(). */ | |
1892 | if (sk == NULL) | |
1893 | return 0; | |
1894 | ||
1895 | /* We allocate the maximum CIPSO option size here so we are probably | |
1896 | * being a little wasteful, but it makes our life _much_ easier later | |
1897 | * on and after all we are only talking about 40 bytes. */ | |
1898 | buf_len = CIPSO_V4_OPT_LEN_MAX; | |
1899 | buf = kmalloc(buf_len, GFP_ATOMIC); | |
1900 | if (buf == NULL) { | |
1901 | ret_val = -ENOMEM; | |
1902 | goto socket_setattr_failure; | |
1903 | } | |
1904 | ||
1905 | ret_val = cipso_v4_genopt(buf, buf_len, doi_def, secattr); | |
1906 | if (ret_val < 0) | |
1907 | goto socket_setattr_failure; | |
1908 | buf_len = ret_val; | |
446fda4f PM |
1909 | |
1910 | /* We can't use ip_options_get() directly because it makes a call to | |
1911 | * ip_options_get_alloc() which allocates memory with GFP_KERNEL and | |
f8687afe PM |
1912 | * we won't always have CAP_NET_RAW even though we _always_ want to |
1913 | * set the IPOPT_CIPSO option. */ | |
446fda4f PM |
1914 | opt_len = (buf_len + 3) & ~3; |
1915 | opt = kzalloc(sizeof(*opt) + opt_len, GFP_ATOMIC); | |
1916 | if (opt == NULL) { | |
1917 | ret_val = -ENOMEM; | |
1918 | goto socket_setattr_failure; | |
1919 | } | |
1920 | memcpy(opt->__data, buf, buf_len); | |
1921 | opt->optlen = opt_len; | |
f8687afe | 1922 | opt->cipso = sizeof(struct iphdr); |
446fda4f PM |
1923 | kfree(buf); |
1924 | buf = NULL; | |
446fda4f PM |
1925 | |
1926 | sk_inet = inet_sk(sk); | |
1927 | if (sk_inet->is_icsk) { | |
1928 | sk_conn = inet_csk(sk); | |
1929 | if (sk_inet->opt) | |
1930 | sk_conn->icsk_ext_hdr_len -= sk_inet->opt->optlen; | |
1931 | sk_conn->icsk_ext_hdr_len += opt->optlen; | |
1932 | sk_conn->icsk_sync_mss(sk, sk_conn->icsk_pmtu_cookie); | |
1933 | } | |
1934 | opt = xchg(&sk_inet->opt, opt); | |
1935 | kfree(opt); | |
1936 | ||
1937 | return 0; | |
1938 | ||
1939 | socket_setattr_failure: | |
1940 | kfree(buf); | |
1941 | kfree(opt); | |
1942 | return ret_val; | |
1943 | } | |
1944 | ||
014ab19a | 1945 | /** |
389fb800 PM |
1946 | * cipso_v4_req_setattr - Add a CIPSO option to a connection request socket |
1947 | * @req: the connection request socket | |
1948 | * @doi_def: the CIPSO DOI to use | |
1949 | * @secattr: the specific security attributes of the socket | |
014ab19a PM |
1950 | * |
1951 | * Description: | |
389fb800 PM |
1952 | * Set the CIPSO option on the given socket using the DOI definition and |
1953 | * security attributes passed to the function. Returns zero on success and | |
1954 | * negative values on failure. | |
014ab19a PM |
1955 | * |
1956 | */ | |
389fb800 PM |
1957 | int cipso_v4_req_setattr(struct request_sock *req, |
1958 | const struct cipso_v4_doi *doi_def, | |
1959 | const struct netlbl_lsm_secattr *secattr) | |
014ab19a | 1960 | { |
389fb800 PM |
1961 | int ret_val = -EPERM; |
1962 | unsigned char *buf = NULL; | |
1963 | u32 buf_len; | |
1964 | u32 opt_len; | |
1965 | struct ip_options *opt = NULL; | |
1966 | struct inet_request_sock *req_inet; | |
014ab19a | 1967 | |
389fb800 PM |
1968 | /* We allocate the maximum CIPSO option size here so we are probably |
1969 | * being a little wasteful, but it makes our life _much_ easier later | |
1970 | * on and after all we are only talking about 40 bytes. */ | |
1971 | buf_len = CIPSO_V4_OPT_LEN_MAX; | |
1972 | buf = kmalloc(buf_len, GFP_ATOMIC); | |
1973 | if (buf == NULL) { | |
1974 | ret_val = -ENOMEM; | |
1975 | goto req_setattr_failure; | |
1976 | } | |
1977 | ||
1978 | ret_val = cipso_v4_genopt(buf, buf_len, doi_def, secattr); | |
1979 | if (ret_val < 0) | |
1980 | goto req_setattr_failure; | |
1981 | buf_len = ret_val; | |
1982 | ||
1983 | /* We can't use ip_options_get() directly because it makes a call to | |
1984 | * ip_options_get_alloc() which allocates memory with GFP_KERNEL and | |
1985 | * we won't always have CAP_NET_RAW even though we _always_ want to | |
1986 | * set the IPOPT_CIPSO option. */ | |
1987 | opt_len = (buf_len + 3) & ~3; | |
1988 | opt = kzalloc(sizeof(*opt) + opt_len, GFP_ATOMIC); | |
1989 | if (opt == NULL) { | |
1990 | ret_val = -ENOMEM; | |
1991 | goto req_setattr_failure; | |
1992 | } | |
1993 | memcpy(opt->__data, buf, buf_len); | |
1994 | opt->optlen = opt_len; | |
1995 | opt->cipso = sizeof(struct iphdr); | |
1996 | kfree(buf); | |
1997 | buf = NULL; | |
1998 | ||
1999 | req_inet = inet_rsk(req); | |
2000 | opt = xchg(&req_inet->opt, opt); | |
2001 | kfree(opt); | |
2002 | ||
2003 | return 0; | |
2004 | ||
2005 | req_setattr_failure: | |
2006 | kfree(buf); | |
2007 | kfree(opt); | |
2008 | return ret_val; | |
2009 | } | |
2010 | ||
2011 | /** | |
2012 | * cipso_v4_delopt - Delete the CIPSO option from a set of IP options | |
2013 | * @opt_ptr: IP option pointer | |
2014 | * | |
2015 | * Description: | |
2016 | * Deletes the CIPSO IP option from a set of IP options and makes the necessary | |
2017 | * adjustments to the IP option structure. Returns zero on success, negative | |
2018 | * values on failure. | |
2019 | * | |
2020 | */ | |
4b17d50f | 2021 | static int cipso_v4_delopt(struct ip_options **opt_ptr) |
389fb800 PM |
2022 | { |
2023 | int hdr_delta = 0; | |
2024 | struct ip_options *opt = *opt_ptr; | |
014ab19a PM |
2025 | |
2026 | if (opt->srr || opt->rr || opt->ts || opt->router_alert) { | |
2027 | u8 cipso_len; | |
2028 | u8 cipso_off; | |
2029 | unsigned char *cipso_ptr; | |
2030 | int iter; | |
2031 | int optlen_new; | |
2032 | ||
2033 | cipso_off = opt->cipso - sizeof(struct iphdr); | |
2034 | cipso_ptr = &opt->__data[cipso_off]; | |
2035 | cipso_len = cipso_ptr[1]; | |
2036 | ||
2037 | if (opt->srr > opt->cipso) | |
2038 | opt->srr -= cipso_len; | |
2039 | if (opt->rr > opt->cipso) | |
2040 | opt->rr -= cipso_len; | |
2041 | if (opt->ts > opt->cipso) | |
2042 | opt->ts -= cipso_len; | |
2043 | if (opt->router_alert > opt->cipso) | |
2044 | opt->router_alert -= cipso_len; | |
2045 | opt->cipso = 0; | |
2046 | ||
2047 | memmove(cipso_ptr, cipso_ptr + cipso_len, | |
2048 | opt->optlen - cipso_off - cipso_len); | |
2049 | ||
2050 | /* determining the new total option length is tricky because of | |
2051 | * the padding necessary, the only thing i can think to do at | |
2052 | * this point is walk the options one-by-one, skipping the | |
2053 | * padding at the end to determine the actual option size and | |
2054 | * from there we can determine the new total option length */ | |
2055 | iter = 0; | |
2056 | optlen_new = 0; | |
2057 | while (iter < opt->optlen) | |
2058 | if (opt->__data[iter] != IPOPT_NOP) { | |
2059 | iter += opt->__data[iter + 1]; | |
2060 | optlen_new = iter; | |
2061 | } else | |
2062 | iter++; | |
2063 | hdr_delta = opt->optlen; | |
2064 | opt->optlen = (optlen_new + 3) & ~3; | |
2065 | hdr_delta -= opt->optlen; | |
2066 | } else { | |
2067 | /* only the cipso option was present on the socket so we can | |
2068 | * remove the entire option struct */ | |
389fb800 | 2069 | *opt_ptr = NULL; |
014ab19a PM |
2070 | hdr_delta = opt->optlen; |
2071 | kfree(opt); | |
2072 | } | |
2073 | ||
389fb800 PM |
2074 | return hdr_delta; |
2075 | } | |
2076 | ||
2077 | /** | |
2078 | * cipso_v4_sock_delattr - Delete the CIPSO option from a socket | |
2079 | * @sk: the socket | |
2080 | * | |
2081 | * Description: | |
2082 | * Removes the CIPSO option from a socket, if present. | |
2083 | * | |
2084 | */ | |
2085 | void cipso_v4_sock_delattr(struct sock *sk) | |
2086 | { | |
2087 | int hdr_delta; | |
2088 | struct ip_options *opt; | |
2089 | struct inet_sock *sk_inet; | |
2090 | ||
2091 | sk_inet = inet_sk(sk); | |
2092 | opt = sk_inet->opt; | |
2093 | if (opt == NULL || opt->cipso == 0) | |
2094 | return; | |
2095 | ||
2096 | hdr_delta = cipso_v4_delopt(&sk_inet->opt); | |
014ab19a PM |
2097 | if (sk_inet->is_icsk && hdr_delta > 0) { |
2098 | struct inet_connection_sock *sk_conn = inet_csk(sk); | |
2099 | sk_conn->icsk_ext_hdr_len -= hdr_delta; | |
2100 | sk_conn->icsk_sync_mss(sk, sk_conn->icsk_pmtu_cookie); | |
2101 | } | |
2102 | } | |
2103 | ||
389fb800 PM |
2104 | /** |
2105 | * cipso_v4_req_delattr - Delete the CIPSO option from a request socket | |
2106 | * @reg: the request socket | |
2107 | * | |
2108 | * Description: | |
2109 | * Removes the CIPSO option from a request socket, if present. | |
2110 | * | |
2111 | */ | |
2112 | void cipso_v4_req_delattr(struct request_sock *req) | |
2113 | { | |
2114 | struct ip_options *opt; | |
2115 | struct inet_request_sock *req_inet; | |
2116 | ||
2117 | req_inet = inet_rsk(req); | |
2118 | opt = req_inet->opt; | |
2119 | if (opt == NULL || opt->cipso == 0) | |
2120 | return; | |
2121 | ||
2122 | cipso_v4_delopt(&req_inet->opt); | |
2123 | } | |
2124 | ||
446fda4f | 2125 | /** |
63d804ea PM |
2126 | * cipso_v4_getattr - Helper function for the cipso_v4_*_getattr functions |
2127 | * @cipso: the CIPSO v4 option | |
446fda4f PM |
2128 | * @secattr: the security attributes |
2129 | * | |
2130 | * Description: | |
63d804ea PM |
2131 | * Inspect @cipso and return the security attributes in @secattr. Returns zero |
2132 | * on success and negative values on failure. | |
446fda4f PM |
2133 | * |
2134 | */ | |
63d804ea PM |
2135 | static int cipso_v4_getattr(const unsigned char *cipso, |
2136 | struct netlbl_lsm_secattr *secattr) | |
446fda4f PM |
2137 | { |
2138 | int ret_val = -ENOMSG; | |
446fda4f PM |
2139 | u32 doi; |
2140 | struct cipso_v4_doi *doi_def; | |
2141 | ||
63d804ea PM |
2142 | if (cipso_v4_cache_check(cipso, cipso[1], secattr) == 0) |
2143 | return 0; | |
446fda4f | 2144 | |
d3e2ce3b | 2145 | doi = get_unaligned_be32(&cipso[2]); |
446fda4f | 2146 | rcu_read_lock(); |
9bb5fd2b | 2147 | doi_def = cipso_v4_doi_search(doi); |
63d804ea PM |
2148 | if (doi_def == NULL) |
2149 | goto getattr_return; | |
91b1ed0a PM |
2150 | /* XXX - This code assumes only one tag per CIPSO option which isn't |
2151 | * really a good assumption to make but since we only support the MAC | |
2152 | * tags right now it is a safe assumption. */ | |
63d804ea | 2153 | switch (cipso[6]) { |
446fda4f | 2154 | case CIPSO_V4_TAG_RBITMAP: |
63d804ea | 2155 | ret_val = cipso_v4_parsetag_rbm(doi_def, &cipso[6], secattr); |
446fda4f | 2156 | break; |
654bbc2a | 2157 | case CIPSO_V4_TAG_ENUM: |
63d804ea | 2158 | ret_val = cipso_v4_parsetag_enum(doi_def, &cipso[6], secattr); |
654bbc2a | 2159 | break; |
484b3669 | 2160 | case CIPSO_V4_TAG_RANGE: |
63d804ea | 2161 | ret_val = cipso_v4_parsetag_rng(doi_def, &cipso[6], secattr); |
484b3669 | 2162 | break; |
15c45f7b PM |
2163 | case CIPSO_V4_TAG_LOCAL: |
2164 | ret_val = cipso_v4_parsetag_loc(doi_def, &cipso[6], secattr); | |
2165 | break; | |
446fda4f | 2166 | } |
16efd454 PM |
2167 | if (ret_val == 0) |
2168 | secattr->type = NETLBL_NLTYPE_CIPSOV4; | |
446fda4f | 2169 | |
63d804ea PM |
2170 | getattr_return: |
2171 | rcu_read_unlock(); | |
14a72f53 PM |
2172 | return ret_val; |
2173 | } | |
2174 | ||
63d804ea PM |
2175 | /** |
2176 | * cipso_v4_sock_getattr - Get the security attributes from a sock | |
2177 | * @sk: the sock | |
2178 | * @secattr: the security attributes | |
2179 | * | |
2180 | * Description: | |
2181 | * Query @sk to see if there is a CIPSO option attached to the sock and if | |
2182 | * there is return the CIPSO security attributes in @secattr. This function | |
2183 | * requires that @sk be locked, or privately held, but it does not do any | |
2184 | * locking itself. Returns zero on success and negative values on failure. | |
2185 | * | |
2186 | */ | |
2187 | int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr) | |
2188 | { | |
2189 | struct ip_options *opt; | |
2190 | ||
2191 | opt = inet_sk(sk)->opt; | |
2192 | if (opt == NULL || opt->cipso == 0) | |
2193 | return -ENOMSG; | |
2194 | ||
2195 | return cipso_v4_getattr(opt->__data + opt->cipso - sizeof(struct iphdr), | |
2196 | secattr); | |
2197 | } | |
2198 | ||
948bf85c PM |
2199 | /** |
2200 | * cipso_v4_skbuff_setattr - Set the CIPSO option on a packet | |
2201 | * @skb: the packet | |
2202 | * @secattr: the security attributes | |
2203 | * | |
2204 | * Description: | |
2205 | * Set the CIPSO option on the given packet based on the security attributes. | |
2206 | * Returns a pointer to the IP header on success and NULL on failure. | |
2207 | * | |
2208 | */ | |
2209 | int cipso_v4_skbuff_setattr(struct sk_buff *skb, | |
2210 | const struct cipso_v4_doi *doi_def, | |
2211 | const struct netlbl_lsm_secattr *secattr) | |
2212 | { | |
2213 | int ret_val; | |
2214 | struct iphdr *iph; | |
2215 | struct ip_options *opt = &IPCB(skb)->opt; | |
2216 | unsigned char buf[CIPSO_V4_OPT_LEN_MAX]; | |
2217 | u32 buf_len = CIPSO_V4_OPT_LEN_MAX; | |
2218 | u32 opt_len; | |
2219 | int len_delta; | |
2220 | ||
00af5c69 | 2221 | ret_val = cipso_v4_genopt(buf, buf_len, doi_def, secattr); |
2222 | if (ret_val < 0) | |
2223 | return ret_val; | |
2224 | buf_len = ret_val; | |
948bf85c PM |
2225 | opt_len = (buf_len + 3) & ~3; |
2226 | ||
2227 | /* we overwrite any existing options to ensure that we have enough | |
2228 | * room for the CIPSO option, the reason is that we _need_ to guarantee | |
2229 | * that the security label is applied to the packet - we do the same | |
2230 | * thing when using the socket options and it hasn't caused a problem, | |
2231 | * if we need to we can always revisit this choice later */ | |
2232 | ||
2233 | len_delta = opt_len - opt->optlen; | |
2234 | /* if we don't ensure enough headroom we could panic on the skb_push() | |
2235 | * call below so make sure we have enough, we are also "mangling" the | |
2236 | * packet so we should probably do a copy-on-write call anyway */ | |
2237 | ret_val = skb_cow(skb, skb_headroom(skb) + len_delta); | |
2238 | if (ret_val < 0) | |
2239 | return ret_val; | |
2240 | ||
2241 | if (len_delta > 0) { | |
2242 | /* we assume that the header + opt->optlen have already been | |
2243 | * "pushed" in ip_options_build() or similar */ | |
2244 | iph = ip_hdr(skb); | |
2245 | skb_push(skb, len_delta); | |
2246 | memmove((char *)iph - len_delta, iph, iph->ihl << 2); | |
2247 | skb_reset_network_header(skb); | |
2248 | iph = ip_hdr(skb); | |
2249 | } else if (len_delta < 0) { | |
2250 | iph = ip_hdr(skb); | |
2251 | memset(iph + 1, IPOPT_NOP, opt->optlen); | |
2252 | } else | |
2253 | iph = ip_hdr(skb); | |
2254 | ||
2255 | if (opt->optlen > 0) | |
2256 | memset(opt, 0, sizeof(*opt)); | |
2257 | opt->optlen = opt_len; | |
2258 | opt->cipso = sizeof(struct iphdr); | |
2259 | opt->is_changed = 1; | |
2260 | ||
2261 | /* we have to do the following because we are being called from a | |
2262 | * netfilter hook which means the packet already has had the header | |
2263 | * fields populated and the checksum calculated - yes this means we | |
2264 | * are doing more work than needed but we do it to keep the core | |
2265 | * stack clean and tidy */ | |
2266 | memcpy(iph + 1, buf, buf_len); | |
2267 | if (opt_len > buf_len) | |
2268 | memset((char *)(iph + 1) + buf_len, 0, opt_len - buf_len); | |
2269 | if (len_delta != 0) { | |
2270 | iph->ihl = 5 + (opt_len >> 2); | |
2271 | iph->tot_len = htons(skb->len); | |
2272 | } | |
2273 | ip_send_check(iph); | |
2274 | ||
2275 | return 0; | |
2276 | } | |
2277 | ||
2278 | /** | |
2279 | * cipso_v4_skbuff_delattr - Delete any CIPSO options from a packet | |
2280 | * @skb: the packet | |
2281 | * | |
2282 | * Description: | |
2283 | * Removes any and all CIPSO options from the given packet. Returns zero on | |
2284 | * success, negative values on failure. | |
2285 | * | |
2286 | */ | |
2287 | int cipso_v4_skbuff_delattr(struct sk_buff *skb) | |
2288 | { | |
2289 | int ret_val; | |
2290 | struct iphdr *iph; | |
2291 | struct ip_options *opt = &IPCB(skb)->opt; | |
2292 | unsigned char *cipso_ptr; | |
2293 | ||
2294 | if (opt->cipso == 0) | |
2295 | return 0; | |
2296 | ||
2297 | /* since we are changing the packet we should make a copy */ | |
2298 | ret_val = skb_cow(skb, skb_headroom(skb)); | |
2299 | if (ret_val < 0) | |
2300 | return ret_val; | |
2301 | ||
2302 | /* the easiest thing to do is just replace the cipso option with noop | |
2303 | * options since we don't change the size of the packet, although we | |
2304 | * still need to recalculate the checksum */ | |
2305 | ||
2306 | iph = ip_hdr(skb); | |
2307 | cipso_ptr = (unsigned char *)iph + opt->cipso; | |
2308 | memset(cipso_ptr, IPOPT_NOOP, cipso_ptr[1]); | |
2309 | opt->cipso = 0; | |
2310 | opt->is_changed = 1; | |
2311 | ||
2312 | ip_send_check(iph); | |
2313 | ||
2314 | return 0; | |
2315 | } | |
2316 | ||
446fda4f PM |
2317 | /** |
2318 | * cipso_v4_skbuff_getattr - Get the security attributes from the CIPSO option | |
2319 | * @skb: the packet | |
2320 | * @secattr: the security attributes | |
2321 | * | |
2322 | * Description: | |
2323 | * Parse the given packet's CIPSO option and return the security attributes. | |
2324 | * Returns zero on success and negative values on failure. | |
2325 | * | |
2326 | */ | |
2327 | int cipso_v4_skbuff_getattr(const struct sk_buff *skb, | |
2328 | struct netlbl_lsm_secattr *secattr) | |
2329 | { | |
63d804ea | 2330 | return cipso_v4_getattr(CIPSO_V4_OPTPTR(skb), secattr); |
446fda4f PM |
2331 | } |
2332 | ||
2333 | /* | |
2334 | * Setup Functions | |
2335 | */ | |
2336 | ||
2337 | /** | |
2338 | * cipso_v4_init - Initialize the CIPSO module | |
2339 | * | |
2340 | * Description: | |
2341 | * Initialize the CIPSO module and prepare it for use. Returns zero on success | |
2342 | * and negative values on failure. | |
2343 | * | |
2344 | */ | |
2345 | static int __init cipso_v4_init(void) | |
2346 | { | |
2347 | int ret_val; | |
2348 | ||
2349 | ret_val = cipso_v4_cache_init(); | |
2350 | if (ret_val != 0) | |
2351 | panic("Failed to initialize the CIPSO/IPv4 cache (%d)\n", | |
2352 | ret_val); | |
2353 | ||
2354 | return 0; | |
2355 | } | |
2356 | ||
2357 | subsys_initcall(cipso_v4_init); |