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Commit | Line | Data |
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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 | |
6 | * FIPS-188, copies of both documents can be found in the Documentation | |
7 | * directory. While CIPSO never became a full IETF RFC standard many vendors | |
8 | * have chosen to adopt the protocol and over the years it has become a | |
9 | * de-facto standard for labeled networking. | |
10 | * | |
11 | * Author: Paul Moore <paul.moore@hp.com> | |
12 | * | |
13 | */ | |
14 | ||
15 | /* | |
16 | * (c) Copyright Hewlett-Packard Development Company, L.P., 2006 | |
17 | * | |
18 | * This program is free software; you can redistribute it and/or modify | |
19 | * it under the terms of the GNU General Public License as published by | |
20 | * the Free Software Foundation; either version 2 of the License, or | |
21 | * (at your option) any later version. | |
22 | * | |
23 | * This program is distributed in the hope that it will be useful, | |
24 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
25 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
26 | * the GNU General Public License for more details. | |
27 | * | |
28 | * You should have received a copy of the GNU General Public License | |
29 | * along with this program; if not, write to the Free Software | |
30 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
31 | * | |
32 | */ | |
33 | ||
34 | #include <linux/init.h> | |
35 | #include <linux/types.h> | |
36 | #include <linux/rcupdate.h> | |
37 | #include <linux/list.h> | |
38 | #include <linux/spinlock.h> | |
39 | #include <linux/string.h> | |
40 | #include <linux/jhash.h> | |
41 | #include <net/ip.h> | |
42 | #include <net/icmp.h> | |
43 | #include <net/tcp.h> | |
44 | #include <net/netlabel.h> | |
45 | #include <net/cipso_ipv4.h> | |
ffb733c6 | 46 | #include <asm/atomic.h> |
446fda4f | 47 | #include <asm/bug.h> |
50e5d35c | 48 | #include <asm/unaligned.h> |
446fda4f PM |
49 | |
50 | struct cipso_v4_domhsh_entry { | |
51 | char *domain; | |
52 | u32 valid; | |
53 | struct list_head list; | |
54 | struct rcu_head rcu; | |
55 | }; | |
56 | ||
57 | /* List of available DOI definitions */ | |
58 | /* XXX - Updates should be minimal so having a single lock for the | |
59 | * cipso_v4_doi_list and the cipso_v4_doi_list->dom_list should be | |
60 | * okay. */ | |
61 | /* XXX - This currently assumes a minimal number of different DOIs in use, | |
62 | * if in practice there are a lot of different DOIs this list should | |
63 | * probably be turned into a hash table or something similar so we | |
64 | * can do quick lookups. */ | |
8ce11e6a | 65 | static DEFINE_SPINLOCK(cipso_v4_doi_list_lock); |
1596c97a | 66 | static LIST_HEAD(cipso_v4_doi_list); |
446fda4f PM |
67 | |
68 | /* Label mapping cache */ | |
69 | int cipso_v4_cache_enabled = 1; | |
70 | int cipso_v4_cache_bucketsize = 10; | |
71 | #define CIPSO_V4_CACHE_BUCKETBITS 7 | |
72 | #define CIPSO_V4_CACHE_BUCKETS (1 << CIPSO_V4_CACHE_BUCKETBITS) | |
73 | #define CIPSO_V4_CACHE_REORDERLIMIT 10 | |
74 | struct cipso_v4_map_cache_bkt { | |
75 | spinlock_t lock; | |
76 | u32 size; | |
77 | struct list_head list; | |
78 | }; | |
79 | struct cipso_v4_map_cache_entry { | |
80 | u32 hash; | |
81 | unsigned char *key; | |
82 | size_t key_len; | |
83 | ||
ffb733c6 | 84 | struct netlbl_lsm_cache *lsm_data; |
446fda4f PM |
85 | |
86 | u32 activity; | |
87 | struct list_head list; | |
88 | }; | |
89 | static struct cipso_v4_map_cache_bkt *cipso_v4_cache = NULL; | |
90 | ||
91 | /* Restricted bitmap (tag #1) flags */ | |
92 | int cipso_v4_rbm_optfmt = 0; | |
93 | int cipso_v4_rbm_strictvalid = 1; | |
94 | ||
f998e8cb PM |
95 | /* |
96 | * Protocol Constants | |
97 | */ | |
98 | ||
99 | /* Maximum size of the CIPSO IP option, derived from the fact that the maximum | |
100 | * IPv4 header size is 60 bytes and the base IPv4 header is 20 bytes long. */ | |
101 | #define CIPSO_V4_OPT_LEN_MAX 40 | |
102 | ||
103 | /* Length of the base CIPSO option, this includes the option type (1 byte), the | |
104 | * option length (1 byte), and the DOI (4 bytes). */ | |
105 | #define CIPSO_V4_HDR_LEN 6 | |
106 | ||
107 | /* Base length of the restrictive category bitmap tag (tag #1). */ | |
108 | #define CIPSO_V4_TAG_RBM_BLEN 4 | |
109 | ||
110 | /* Base length of the enumerated category tag (tag #2). */ | |
111 | #define CIPSO_V4_TAG_ENUM_BLEN 4 | |
112 | ||
113 | /* Base length of the ranged categories bitmap tag (tag #5). */ | |
114 | #define CIPSO_V4_TAG_RNG_BLEN 4 | |
115 | /* The maximum number of category ranges permitted in the ranged category tag | |
116 | * (tag #5). You may note that the IETF draft states that the maximum number | |
117 | * of category ranges is 7, but if the low end of the last category range is | |
118 | * zero then it is possibile to fit 8 category ranges because the zero should | |
119 | * be omitted. */ | |
120 | #define CIPSO_V4_TAG_RNG_CAT_MAX 8 | |
121 | ||
446fda4f PM |
122 | /* |
123 | * Helper Functions | |
124 | */ | |
125 | ||
126 | /** | |
127 | * cipso_v4_bitmap_walk - Walk a bitmap looking for a bit | |
128 | * @bitmap: the bitmap | |
129 | * @bitmap_len: length in bits | |
130 | * @offset: starting offset | |
131 | * @state: if non-zero, look for a set (1) bit else look for a cleared (0) bit | |
132 | * | |
133 | * Description: | |
134 | * Starting at @offset, walk the bitmap from left to right until either the | |
135 | * desired bit is found or we reach the end. Return the bit offset, -1 if | |
136 | * not found, or -2 if error. | |
137 | */ | |
138 | static int cipso_v4_bitmap_walk(const unsigned char *bitmap, | |
139 | u32 bitmap_len, | |
140 | u32 offset, | |
141 | u8 state) | |
142 | { | |
143 | u32 bit_spot; | |
144 | u32 byte_offset; | |
145 | unsigned char bitmask; | |
146 | unsigned char byte; | |
147 | ||
148 | /* gcc always rounds to zero when doing integer division */ | |
149 | byte_offset = offset / 8; | |
150 | byte = bitmap[byte_offset]; | |
151 | bit_spot = offset; | |
152 | bitmask = 0x80 >> (offset % 8); | |
153 | ||
154 | while (bit_spot < bitmap_len) { | |
155 | if ((state && (byte & bitmask) == bitmask) || | |
156 | (state == 0 && (byte & bitmask) == 0)) | |
157 | return bit_spot; | |
158 | ||
159 | bit_spot++; | |
160 | bitmask >>= 1; | |
161 | if (bitmask == 0) { | |
162 | byte = bitmap[++byte_offset]; | |
163 | bitmask = 0x80; | |
164 | } | |
165 | } | |
166 | ||
167 | return -1; | |
168 | } | |
169 | ||
170 | /** | |
171 | * cipso_v4_bitmap_setbit - Sets a single bit in a bitmap | |
172 | * @bitmap: the bitmap | |
173 | * @bit: the bit | |
174 | * @state: if non-zero, set the bit (1) else clear the bit (0) | |
175 | * | |
176 | * Description: | |
177 | * Set a single bit in the bitmask. Returns zero on success, negative values | |
178 | * on error. | |
179 | */ | |
180 | static void cipso_v4_bitmap_setbit(unsigned char *bitmap, | |
181 | u32 bit, | |
182 | u8 state) | |
183 | { | |
184 | u32 byte_spot; | |
185 | u8 bitmask; | |
186 | ||
187 | /* gcc always rounds to zero when doing integer division */ | |
188 | byte_spot = bit / 8; | |
189 | bitmask = 0x80 >> (bit % 8); | |
190 | if (state) | |
191 | bitmap[byte_spot] |= bitmask; | |
192 | else | |
193 | bitmap[byte_spot] &= ~bitmask; | |
194 | } | |
195 | ||
196 | /** | |
197 | * cipso_v4_doi_domhsh_free - Frees a domain list entry | |
198 | * @entry: the entry's RCU field | |
199 | * | |
200 | * Description: | |
201 | * This function is designed to be used as a callback to the call_rcu() | |
202 | * function so that the memory allocated to a domain list entry can be released | |
203 | * safely. | |
204 | * | |
205 | */ | |
206 | static void cipso_v4_doi_domhsh_free(struct rcu_head *entry) | |
207 | { | |
208 | struct cipso_v4_domhsh_entry *ptr; | |
209 | ||
210 | ptr = container_of(entry, struct cipso_v4_domhsh_entry, rcu); | |
211 | kfree(ptr->domain); | |
212 | kfree(ptr); | |
213 | } | |
214 | ||
215 | /** | |
216 | * cipso_v4_cache_entry_free - Frees a cache entry | |
217 | * @entry: the entry to free | |
218 | * | |
219 | * Description: | |
ffb733c6 | 220 | * This function frees the memory associated with a cache entry including the |
221 | * LSM cache data if there are no longer any users, i.e. reference count == 0. | |
446fda4f PM |
222 | * |
223 | */ | |
224 | static void cipso_v4_cache_entry_free(struct cipso_v4_map_cache_entry *entry) | |
225 | { | |
ffb733c6 | 226 | if (entry->lsm_data) |
227 | netlbl_secattr_cache_free(entry->lsm_data); | |
446fda4f PM |
228 | kfree(entry->key); |
229 | kfree(entry); | |
230 | } | |
231 | ||
232 | /** | |
233 | * cipso_v4_map_cache_hash - Hashing function for the CIPSO cache | |
234 | * @key: the hash key | |
235 | * @key_len: the length of the key in bytes | |
236 | * | |
237 | * Description: | |
238 | * The CIPSO tag hashing function. Returns a 32-bit hash value. | |
239 | * | |
240 | */ | |
241 | static u32 cipso_v4_map_cache_hash(const unsigned char *key, u32 key_len) | |
242 | { | |
243 | return jhash(key, key_len, 0); | |
244 | } | |
245 | ||
246 | /* | |
247 | * Label Mapping Cache Functions | |
248 | */ | |
249 | ||
250 | /** | |
251 | * cipso_v4_cache_init - Initialize the CIPSO cache | |
252 | * | |
253 | * Description: | |
254 | * Initializes the CIPSO label mapping cache, this function should be called | |
255 | * before any of the other functions defined in this file. Returns zero on | |
256 | * success, negative values on error. | |
257 | * | |
258 | */ | |
259 | static int cipso_v4_cache_init(void) | |
260 | { | |
261 | u32 iter; | |
262 | ||
263 | cipso_v4_cache = kcalloc(CIPSO_V4_CACHE_BUCKETS, | |
264 | sizeof(struct cipso_v4_map_cache_bkt), | |
265 | GFP_KERNEL); | |
266 | if (cipso_v4_cache == NULL) | |
267 | return -ENOMEM; | |
268 | ||
269 | for (iter = 0; iter < CIPSO_V4_CACHE_BUCKETS; iter++) { | |
270 | spin_lock_init(&cipso_v4_cache[iter].lock); | |
271 | cipso_v4_cache[iter].size = 0; | |
272 | INIT_LIST_HEAD(&cipso_v4_cache[iter].list); | |
273 | } | |
274 | ||
275 | return 0; | |
276 | } | |
277 | ||
278 | /** | |
279 | * cipso_v4_cache_invalidate - Invalidates the current CIPSO cache | |
280 | * | |
281 | * Description: | |
282 | * Invalidates and frees any entries in the CIPSO cache. Returns zero on | |
283 | * success and negative values on failure. | |
284 | * | |
285 | */ | |
286 | void cipso_v4_cache_invalidate(void) | |
287 | { | |
288 | struct cipso_v4_map_cache_entry *entry, *tmp_entry; | |
289 | u32 iter; | |
290 | ||
291 | for (iter = 0; iter < CIPSO_V4_CACHE_BUCKETS; iter++) { | |
609c92fe | 292 | spin_lock_bh(&cipso_v4_cache[iter].lock); |
446fda4f PM |
293 | list_for_each_entry_safe(entry, |
294 | tmp_entry, | |
295 | &cipso_v4_cache[iter].list, list) { | |
296 | list_del(&entry->list); | |
297 | cipso_v4_cache_entry_free(entry); | |
298 | } | |
299 | cipso_v4_cache[iter].size = 0; | |
609c92fe | 300 | spin_unlock_bh(&cipso_v4_cache[iter].lock); |
446fda4f PM |
301 | } |
302 | ||
303 | return; | |
304 | } | |
305 | ||
306 | /** | |
307 | * cipso_v4_cache_check - Check the CIPSO cache for a label mapping | |
308 | * @key: the buffer to check | |
309 | * @key_len: buffer length in bytes | |
310 | * @secattr: the security attribute struct to use | |
311 | * | |
312 | * Description: | |
313 | * This function checks the cache to see if a label mapping already exists for | |
314 | * the given key. If there is a match then the cache is adjusted and the | |
315 | * @secattr struct is populated with the correct LSM security attributes. The | |
316 | * cache is adjusted in the following manner if the entry is not already the | |
317 | * first in the cache bucket: | |
318 | * | |
319 | * 1. The cache entry's activity counter is incremented | |
320 | * 2. The previous (higher ranking) entry's activity counter is decremented | |
321 | * 3. If the difference between the two activity counters is geater than | |
322 | * CIPSO_V4_CACHE_REORDERLIMIT the two entries are swapped | |
323 | * | |
324 | * Returns zero on success, -ENOENT for a cache miss, and other negative values | |
325 | * on error. | |
326 | * | |
327 | */ | |
328 | static int cipso_v4_cache_check(const unsigned char *key, | |
329 | u32 key_len, | |
330 | struct netlbl_lsm_secattr *secattr) | |
331 | { | |
332 | u32 bkt; | |
333 | struct cipso_v4_map_cache_entry *entry; | |
334 | struct cipso_v4_map_cache_entry *prev_entry = NULL; | |
335 | u32 hash; | |
336 | ||
337 | if (!cipso_v4_cache_enabled) | |
338 | return -ENOENT; | |
339 | ||
340 | hash = cipso_v4_map_cache_hash(key, key_len); | |
341 | bkt = hash & (CIPSO_V4_CACHE_BUCKETBITS - 1); | |
609c92fe | 342 | spin_lock_bh(&cipso_v4_cache[bkt].lock); |
446fda4f PM |
343 | list_for_each_entry(entry, &cipso_v4_cache[bkt].list, list) { |
344 | if (entry->hash == hash && | |
345 | entry->key_len == key_len && | |
346 | memcmp(entry->key, key, key_len) == 0) { | |
347 | entry->activity += 1; | |
ffb733c6 | 348 | atomic_inc(&entry->lsm_data->refcount); |
349 | secattr->cache = entry->lsm_data; | |
701a90ba | 350 | secattr->flags |= NETLBL_SECATTR_CACHE; |
16efd454 | 351 | secattr->type = NETLBL_NLTYPE_CIPSOV4; |
446fda4f | 352 | if (prev_entry == NULL) { |
609c92fe | 353 | spin_unlock_bh(&cipso_v4_cache[bkt].lock); |
446fda4f PM |
354 | return 0; |
355 | } | |
356 | ||
357 | if (prev_entry->activity > 0) | |
358 | prev_entry->activity -= 1; | |
359 | if (entry->activity > prev_entry->activity && | |
360 | entry->activity - prev_entry->activity > | |
361 | CIPSO_V4_CACHE_REORDERLIMIT) { | |
362 | __list_del(entry->list.prev, entry->list.next); | |
363 | __list_add(&entry->list, | |
364 | prev_entry->list.prev, | |
365 | &prev_entry->list); | |
366 | } | |
367 | ||
609c92fe | 368 | spin_unlock_bh(&cipso_v4_cache[bkt].lock); |
446fda4f PM |
369 | return 0; |
370 | } | |
371 | prev_entry = entry; | |
372 | } | |
609c92fe | 373 | spin_unlock_bh(&cipso_v4_cache[bkt].lock); |
446fda4f PM |
374 | |
375 | return -ENOENT; | |
376 | } | |
377 | ||
378 | /** | |
379 | * cipso_v4_cache_add - Add an entry to the CIPSO cache | |
380 | * @skb: the packet | |
381 | * @secattr: the packet's security attributes | |
382 | * | |
383 | * Description: | |
384 | * Add a new entry into the CIPSO label mapping cache. Add the new entry to | |
385 | * head of the cache bucket's list, if the cache bucket is out of room remove | |
386 | * the last entry in the list first. It is important to note that there is | |
387 | * currently no checking for duplicate keys. Returns zero on success, | |
388 | * negative values on failure. | |
389 | * | |
390 | */ | |
391 | int cipso_v4_cache_add(const struct sk_buff *skb, | |
392 | const struct netlbl_lsm_secattr *secattr) | |
393 | { | |
394 | int ret_val = -EPERM; | |
395 | u32 bkt; | |
396 | struct cipso_v4_map_cache_entry *entry = NULL; | |
397 | struct cipso_v4_map_cache_entry *old_entry = NULL; | |
398 | unsigned char *cipso_ptr; | |
399 | u32 cipso_ptr_len; | |
400 | ||
401 | if (!cipso_v4_cache_enabled || cipso_v4_cache_bucketsize <= 0) | |
402 | return 0; | |
403 | ||
404 | cipso_ptr = CIPSO_V4_OPTPTR(skb); | |
405 | cipso_ptr_len = cipso_ptr[1]; | |
406 | ||
407 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); | |
408 | if (entry == NULL) | |
409 | return -ENOMEM; | |
fac5d731 | 410 | entry->key = kmemdup(cipso_ptr, cipso_ptr_len, GFP_ATOMIC); |
446fda4f PM |
411 | if (entry->key == NULL) { |
412 | ret_val = -ENOMEM; | |
413 | goto cache_add_failure; | |
414 | } | |
446fda4f PM |
415 | entry->key_len = cipso_ptr_len; |
416 | entry->hash = cipso_v4_map_cache_hash(cipso_ptr, cipso_ptr_len); | |
ffb733c6 | 417 | atomic_inc(&secattr->cache->refcount); |
418 | entry->lsm_data = secattr->cache; | |
446fda4f PM |
419 | |
420 | bkt = entry->hash & (CIPSO_V4_CACHE_BUCKETBITS - 1); | |
609c92fe | 421 | spin_lock_bh(&cipso_v4_cache[bkt].lock); |
446fda4f PM |
422 | if (cipso_v4_cache[bkt].size < cipso_v4_cache_bucketsize) { |
423 | list_add(&entry->list, &cipso_v4_cache[bkt].list); | |
424 | cipso_v4_cache[bkt].size += 1; | |
425 | } else { | |
426 | old_entry = list_entry(cipso_v4_cache[bkt].list.prev, | |
427 | struct cipso_v4_map_cache_entry, list); | |
428 | list_del(&old_entry->list); | |
429 | list_add(&entry->list, &cipso_v4_cache[bkt].list); | |
430 | cipso_v4_cache_entry_free(old_entry); | |
431 | } | |
609c92fe | 432 | spin_unlock_bh(&cipso_v4_cache[bkt].lock); |
446fda4f PM |
433 | |
434 | return 0; | |
435 | ||
436 | cache_add_failure: | |
437 | if (entry) | |
438 | cipso_v4_cache_entry_free(entry); | |
439 | return ret_val; | |
440 | } | |
441 | ||
442 | /* | |
443 | * DOI List Functions | |
444 | */ | |
445 | ||
446 | /** | |
447 | * cipso_v4_doi_search - Searches for a DOI definition | |
448 | * @doi: the DOI to search for | |
449 | * | |
450 | * Description: | |
451 | * Search the DOI definition list for a DOI definition with a DOI value that | |
452 | * matches @doi. The caller is responsibile for calling rcu_read_[un]lock(). | |
453 | * Returns a pointer to the DOI definition on success and NULL on failure. | |
454 | */ | |
455 | static struct cipso_v4_doi *cipso_v4_doi_search(u32 doi) | |
456 | { | |
457 | struct cipso_v4_doi *iter; | |
458 | ||
459 | list_for_each_entry_rcu(iter, &cipso_v4_doi_list, list) | |
460 | if (iter->doi == doi && iter->valid) | |
461 | return iter; | |
462 | return NULL; | |
463 | } | |
464 | ||
465 | /** | |
466 | * cipso_v4_doi_add - Add a new DOI to the CIPSO protocol engine | |
467 | * @doi_def: the DOI structure | |
468 | * | |
469 | * Description: | |
470 | * The caller defines a new DOI for use by the CIPSO engine and calls this | |
471 | * function to add it to the list of acceptable domains. The caller must | |
472 | * ensure that the mapping table specified in @doi_def->map meets all of the | |
473 | * requirements of the mapping type (see cipso_ipv4.h for details). Returns | |
474 | * zero on success and non-zero on failure. | |
475 | * | |
476 | */ | |
477 | int cipso_v4_doi_add(struct cipso_v4_doi *doi_def) | |
478 | { | |
6ce61a7c PM |
479 | u32 iter; |
480 | ||
446fda4f PM |
481 | if (doi_def == NULL || doi_def->doi == CIPSO_V4_DOI_UNKNOWN) |
482 | return -EINVAL; | |
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 PM |
487 | case CIPSO_V4_TAG_RANGE: |
488 | if (doi_def->type != CIPSO_V4_MAP_PASS) | |
489 | return -EINVAL; | |
490 | break; | |
6ce61a7c PM |
491 | case CIPSO_V4_TAG_INVALID: |
492 | if (iter == 0) | |
493 | return -EINVAL; | |
494 | break; | |
654bbc2a PM |
495 | case CIPSO_V4_TAG_ENUM: |
496 | if (doi_def->type != CIPSO_V4_MAP_PASS) | |
497 | return -EINVAL; | |
498 | break; | |
6ce61a7c PM |
499 | default: |
500 | return -EINVAL; | |
501 | } | |
502 | } | |
446fda4f PM |
503 | |
504 | doi_def->valid = 1; | |
505 | INIT_RCU_HEAD(&doi_def->rcu); | |
506 | INIT_LIST_HEAD(&doi_def->dom_list); | |
507 | ||
446fda4f PM |
508 | spin_lock(&cipso_v4_doi_list_lock); |
509 | if (cipso_v4_doi_search(doi_def->doi) != NULL) | |
4be2700f | 510 | goto doi_add_failure; |
446fda4f PM |
511 | list_add_tail_rcu(&doi_def->list, &cipso_v4_doi_list); |
512 | spin_unlock(&cipso_v4_doi_list_lock); | |
446fda4f PM |
513 | |
514 | return 0; | |
515 | ||
4be2700f | 516 | doi_add_failure: |
446fda4f | 517 | spin_unlock(&cipso_v4_doi_list_lock); |
446fda4f PM |
518 | return -EEXIST; |
519 | } | |
520 | ||
521 | /** | |
522 | * cipso_v4_doi_remove - Remove an existing DOI from the CIPSO protocol engine | |
523 | * @doi: the DOI value | |
32f50cde | 524 | * @audit_secid: the LSM secid to use in the audit message |
446fda4f PM |
525 | * @callback: the DOI cleanup/free callback |
526 | * | |
527 | * Description: | |
528 | * Removes a DOI definition from the CIPSO engine, @callback is called to | |
529 | * free any memory. The NetLabel routines will be called to release their own | |
530 | * LSM domain mappings as well as our own domain list. Returns zero on | |
531 | * success and negative values on failure. | |
532 | * | |
533 | */ | |
32f50cde | 534 | int cipso_v4_doi_remove(u32 doi, |
95d4e6be | 535 | struct netlbl_audit *audit_info, |
32f50cde | 536 | void (*callback) (struct rcu_head * head)) |
446fda4f PM |
537 | { |
538 | struct cipso_v4_doi *doi_def; | |
539 | struct cipso_v4_domhsh_entry *dom_iter; | |
540 | ||
4be2700f PM |
541 | spin_lock(&cipso_v4_doi_list_lock); |
542 | doi_def = cipso_v4_doi_search(doi); | |
543 | if (doi_def != NULL) { | |
446fda4f PM |
544 | doi_def->valid = 0; |
545 | list_del_rcu(&doi_def->list); | |
546 | spin_unlock(&cipso_v4_doi_list_lock); | |
4be2700f | 547 | rcu_read_lock(); |
446fda4f PM |
548 | list_for_each_entry_rcu(dom_iter, &doi_def->dom_list, list) |
549 | if (dom_iter->valid) | |
eda61d32 PM |
550 | netlbl_cfg_map_del(dom_iter->domain, |
551 | audit_info); | |
446fda4f | 552 | rcu_read_unlock(); |
4be2700f | 553 | cipso_v4_cache_invalidate(); |
446fda4f PM |
554 | call_rcu(&doi_def->rcu, callback); |
555 | return 0; | |
556 | } | |
4be2700f | 557 | spin_unlock(&cipso_v4_doi_list_lock); |
446fda4f PM |
558 | |
559 | return -ENOENT; | |
560 | } | |
561 | ||
562 | /** | |
563 | * cipso_v4_doi_getdef - Returns a pointer to a valid DOI definition | |
564 | * @doi: the DOI value | |
565 | * | |
566 | * Description: | |
567 | * Searches for a valid DOI definition and if one is found it is returned to | |
568 | * the caller. Otherwise NULL is returned. The caller must ensure that | |
569 | * rcu_read_lock() is held while accessing the returned definition. | |
570 | * | |
571 | */ | |
572 | struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi) | |
573 | { | |
574 | return cipso_v4_doi_search(doi); | |
575 | } | |
576 | ||
577 | /** | |
fcd48280 PM |
578 | * cipso_v4_doi_walk - Iterate through the DOI definitions |
579 | * @skip_cnt: skip past this number of DOI definitions, updated | |
580 | * @callback: callback for each DOI definition | |
581 | * @cb_arg: argument for the callback function | |
446fda4f PM |
582 | * |
583 | * Description: | |
fcd48280 PM |
584 | * Iterate over the DOI definition list, skipping the first @skip_cnt entries. |
585 | * For each entry call @callback, if @callback returns a negative value stop | |
586 | * 'walking' through the list and return. Updates the value in @skip_cnt upon | |
587 | * return. Returns zero on success, negative values on failure. | |
446fda4f PM |
588 | * |
589 | */ | |
fcd48280 PM |
590 | int cipso_v4_doi_walk(u32 *skip_cnt, |
591 | int (*callback) (struct cipso_v4_doi *doi_def, void *arg), | |
592 | void *cb_arg) | |
446fda4f | 593 | { |
fcd48280 | 594 | int ret_val = -ENOENT; |
446fda4f | 595 | u32 doi_cnt = 0; |
fcd48280 | 596 | struct cipso_v4_doi *iter_doi; |
446fda4f | 597 | |
446fda4f | 598 | rcu_read_lock(); |
fcd48280 PM |
599 | list_for_each_entry_rcu(iter_doi, &cipso_v4_doi_list, list) |
600 | if (iter_doi->valid) { | |
601 | if (doi_cnt++ < *skip_cnt) | |
602 | continue; | |
603 | ret_val = callback(iter_doi, cb_arg); | |
604 | if (ret_val < 0) { | |
605 | doi_cnt--; | |
606 | goto doi_walk_return; | |
446fda4f | 607 | } |
446fda4f | 608 | } |
446fda4f | 609 | |
fcd48280 | 610 | doi_walk_return: |
446fda4f | 611 | rcu_read_unlock(); |
fcd48280 PM |
612 | *skip_cnt = doi_cnt; |
613 | return ret_val; | |
446fda4f PM |
614 | } |
615 | ||
616 | /** | |
617 | * cipso_v4_doi_domhsh_add - Adds a domain entry to a DOI definition | |
618 | * @doi_def: the DOI definition | |
619 | * @domain: the domain to add | |
620 | * | |
621 | * Description: | |
59c51591 | 622 | * Adds the @domain to the DOI specified by @doi_def, this function |
446fda4f PM |
623 | * should only be called by external functions (i.e. NetLabel). This function |
624 | * does allocate memory. Returns zero on success, negative values on failure. | |
625 | * | |
626 | */ | |
627 | int cipso_v4_doi_domhsh_add(struct cipso_v4_doi *doi_def, const char *domain) | |
628 | { | |
629 | struct cipso_v4_domhsh_entry *iter; | |
630 | struct cipso_v4_domhsh_entry *new_dom; | |
631 | ||
632 | new_dom = kzalloc(sizeof(*new_dom), GFP_KERNEL); | |
633 | if (new_dom == NULL) | |
634 | return -ENOMEM; | |
635 | if (domain) { | |
636 | new_dom->domain = kstrdup(domain, GFP_KERNEL); | |
637 | if (new_dom->domain == NULL) { | |
638 | kfree(new_dom); | |
639 | return -ENOMEM; | |
640 | } | |
641 | } | |
642 | new_dom->valid = 1; | |
643 | INIT_RCU_HEAD(&new_dom->rcu); | |
644 | ||
446fda4f | 645 | spin_lock(&cipso_v4_doi_list_lock); |
4be2700f | 646 | list_for_each_entry(iter, &doi_def->dom_list, list) |
446fda4f PM |
647 | if (iter->valid && |
648 | ((domain != NULL && iter->domain != NULL && | |
649 | strcmp(iter->domain, domain) == 0) || | |
650 | (domain == NULL && iter->domain == NULL))) { | |
651 | spin_unlock(&cipso_v4_doi_list_lock); | |
446fda4f PM |
652 | kfree(new_dom->domain); |
653 | kfree(new_dom); | |
654 | return -EEXIST; | |
655 | } | |
656 | list_add_tail_rcu(&new_dom->list, &doi_def->dom_list); | |
657 | spin_unlock(&cipso_v4_doi_list_lock); | |
446fda4f PM |
658 | |
659 | return 0; | |
660 | } | |
661 | ||
662 | /** | |
663 | * cipso_v4_doi_domhsh_remove - Removes a domain entry from a DOI definition | |
664 | * @doi_def: the DOI definition | |
665 | * @domain: the domain to remove | |
666 | * | |
667 | * Description: | |
668 | * Removes the @domain from the DOI specified by @doi_def, this function | |
669 | * should only be called by external functions (i.e. NetLabel). Returns zero | |
670 | * on success and negative values on error. | |
671 | * | |
672 | */ | |
673 | int cipso_v4_doi_domhsh_remove(struct cipso_v4_doi *doi_def, | |
674 | const char *domain) | |
675 | { | |
676 | struct cipso_v4_domhsh_entry *iter; | |
677 | ||
446fda4f | 678 | spin_lock(&cipso_v4_doi_list_lock); |
4be2700f | 679 | list_for_each_entry(iter, &doi_def->dom_list, list) |
446fda4f PM |
680 | if (iter->valid && |
681 | ((domain != NULL && iter->domain != NULL && | |
682 | strcmp(iter->domain, domain) == 0) || | |
683 | (domain == NULL && iter->domain == NULL))) { | |
684 | iter->valid = 0; | |
685 | list_del_rcu(&iter->list); | |
686 | spin_unlock(&cipso_v4_doi_list_lock); | |
446fda4f | 687 | call_rcu(&iter->rcu, cipso_v4_doi_domhsh_free); |
446fda4f PM |
688 | return 0; |
689 | } | |
690 | spin_unlock(&cipso_v4_doi_list_lock); | |
446fda4f PM |
691 | |
692 | return -ENOENT; | |
693 | } | |
694 | ||
695 | /* | |
696 | * Label Mapping Functions | |
697 | */ | |
698 | ||
699 | /** | |
700 | * cipso_v4_map_lvl_valid - Checks to see if the given level is understood | |
701 | * @doi_def: the DOI definition | |
702 | * @level: the level to check | |
703 | * | |
704 | * Description: | |
705 | * Checks the given level against the given DOI definition and returns a | |
706 | * negative value if the level does not have a valid mapping and a zero value | |
707 | * if the level is defined by the DOI. | |
708 | * | |
709 | */ | |
710 | static int cipso_v4_map_lvl_valid(const struct cipso_v4_doi *doi_def, u8 level) | |
711 | { | |
712 | switch (doi_def->type) { | |
713 | case CIPSO_V4_MAP_PASS: | |
714 | return 0; | |
715 | case CIPSO_V4_MAP_STD: | |
716 | if (doi_def->map.std->lvl.cipso[level] < CIPSO_V4_INV_LVL) | |
717 | return 0; | |
718 | break; | |
719 | } | |
720 | ||
721 | return -EFAULT; | |
722 | } | |
723 | ||
724 | /** | |
725 | * cipso_v4_map_lvl_hton - Perform a level mapping from the host to the network | |
726 | * @doi_def: the DOI definition | |
727 | * @host_lvl: the host MLS level | |
728 | * @net_lvl: the network/CIPSO MLS level | |
729 | * | |
730 | * Description: | |
731 | * Perform a label mapping to translate a local MLS level to the correct | |
732 | * CIPSO level using the given DOI definition. Returns zero on success, | |
733 | * negative values otherwise. | |
734 | * | |
735 | */ | |
736 | static int cipso_v4_map_lvl_hton(const struct cipso_v4_doi *doi_def, | |
737 | u32 host_lvl, | |
738 | u32 *net_lvl) | |
739 | { | |
740 | switch (doi_def->type) { | |
741 | case CIPSO_V4_MAP_PASS: | |
742 | *net_lvl = host_lvl; | |
743 | return 0; | |
744 | case CIPSO_V4_MAP_STD: | |
c6387a86 PM |
745 | if (host_lvl < doi_def->map.std->lvl.local_size && |
746 | doi_def->map.std->lvl.local[host_lvl] < CIPSO_V4_INV_LVL) { | |
446fda4f PM |
747 | *net_lvl = doi_def->map.std->lvl.local[host_lvl]; |
748 | return 0; | |
749 | } | |
c6387a86 | 750 | return -EPERM; |
446fda4f PM |
751 | } |
752 | ||
753 | return -EINVAL; | |
754 | } | |
755 | ||
756 | /** | |
757 | * cipso_v4_map_lvl_ntoh - Perform a level mapping from the network to the host | |
758 | * @doi_def: the DOI definition | |
759 | * @net_lvl: the network/CIPSO MLS level | |
760 | * @host_lvl: the host MLS level | |
761 | * | |
762 | * Description: | |
763 | * Perform a label mapping to translate a CIPSO level to the correct local MLS | |
764 | * level using the given DOI definition. Returns zero on success, negative | |
765 | * values otherwise. | |
766 | * | |
767 | */ | |
768 | static int cipso_v4_map_lvl_ntoh(const struct cipso_v4_doi *doi_def, | |
769 | u32 net_lvl, | |
770 | u32 *host_lvl) | |
771 | { | |
772 | struct cipso_v4_std_map_tbl *map_tbl; | |
773 | ||
774 | switch (doi_def->type) { | |
775 | case CIPSO_V4_MAP_PASS: | |
776 | *host_lvl = net_lvl; | |
777 | return 0; | |
778 | case CIPSO_V4_MAP_STD: | |
779 | map_tbl = doi_def->map.std; | |
780 | if (net_lvl < map_tbl->lvl.cipso_size && | |
781 | map_tbl->lvl.cipso[net_lvl] < CIPSO_V4_INV_LVL) { | |
782 | *host_lvl = doi_def->map.std->lvl.cipso[net_lvl]; | |
783 | return 0; | |
784 | } | |
c6387a86 | 785 | return -EPERM; |
446fda4f PM |
786 | } |
787 | ||
788 | return -EINVAL; | |
789 | } | |
790 | ||
791 | /** | |
792 | * cipso_v4_map_cat_rbm_valid - Checks to see if the category bitmap is valid | |
793 | * @doi_def: the DOI definition | |
794 | * @bitmap: category bitmap | |
795 | * @bitmap_len: bitmap length in bytes | |
796 | * | |
797 | * Description: | |
798 | * Checks the given category bitmap against the given DOI definition and | |
799 | * returns a negative value if any of the categories in the bitmap do not have | |
800 | * a valid mapping and a zero value if all of the categories are valid. | |
801 | * | |
802 | */ | |
803 | static int cipso_v4_map_cat_rbm_valid(const struct cipso_v4_doi *doi_def, | |
804 | const unsigned char *bitmap, | |
805 | u32 bitmap_len) | |
806 | { | |
807 | int cat = -1; | |
808 | u32 bitmap_len_bits = bitmap_len * 8; | |
044a68ed PM |
809 | u32 cipso_cat_size; |
810 | u32 *cipso_array; | |
446fda4f PM |
811 | |
812 | switch (doi_def->type) { | |
813 | case CIPSO_V4_MAP_PASS: | |
814 | return 0; | |
815 | case CIPSO_V4_MAP_STD: | |
044a68ed PM |
816 | cipso_cat_size = doi_def->map.std->cat.cipso_size; |
817 | cipso_array = doi_def->map.std->cat.cipso; | |
446fda4f PM |
818 | for (;;) { |
819 | cat = cipso_v4_bitmap_walk(bitmap, | |
820 | bitmap_len_bits, | |
821 | cat + 1, | |
822 | 1); | |
823 | if (cat < 0) | |
824 | break; | |
825 | if (cat >= cipso_cat_size || | |
826 | cipso_array[cat] >= CIPSO_V4_INV_CAT) | |
827 | return -EFAULT; | |
828 | } | |
829 | ||
830 | if (cat == -1) | |
831 | return 0; | |
832 | break; | |
833 | } | |
834 | ||
835 | return -EFAULT; | |
836 | } | |
837 | ||
838 | /** | |
839 | * cipso_v4_map_cat_rbm_hton - Perform a category mapping from host to network | |
840 | * @doi_def: the DOI definition | |
02752760 | 841 | * @secattr: the security attributes |
446fda4f PM |
842 | * @net_cat: the zero'd out category bitmap in network/CIPSO format |
843 | * @net_cat_len: the length of the CIPSO bitmap in bytes | |
844 | * | |
845 | * Description: | |
846 | * Perform a label mapping to translate a local MLS category bitmap to the | |
847 | * correct CIPSO bitmap using the given DOI definition. Returns the minimum | |
848 | * size in bytes of the network bitmap on success, negative values otherwise. | |
849 | * | |
850 | */ | |
851 | static int cipso_v4_map_cat_rbm_hton(const struct cipso_v4_doi *doi_def, | |
02752760 | 852 | const struct netlbl_lsm_secattr *secattr, |
446fda4f PM |
853 | unsigned char *net_cat, |
854 | u32 net_cat_len) | |
855 | { | |
856 | int host_spot = -1; | |
02752760 | 857 | u32 net_spot = CIPSO_V4_INV_CAT; |
446fda4f | 858 | u32 net_spot_max = 0; |
446fda4f | 859 | u32 net_clen_bits = net_cat_len * 8; |
02752760 PM |
860 | u32 host_cat_size = 0; |
861 | u32 *host_cat_array = NULL; | |
446fda4f | 862 | |
02752760 | 863 | if (doi_def->type == CIPSO_V4_MAP_STD) { |
044a68ed PM |
864 | host_cat_size = doi_def->map.std->cat.local_size; |
865 | host_cat_array = doi_def->map.std->cat.local; | |
02752760 PM |
866 | } |
867 | ||
868 | for (;;) { | |
16efd454 | 869 | host_spot = netlbl_secattr_catmap_walk(secattr->attr.mls.cat, |
02752760 PM |
870 | host_spot + 1); |
871 | if (host_spot < 0) | |
872 | break; | |
873 | ||
874 | switch (doi_def->type) { | |
875 | case CIPSO_V4_MAP_PASS: | |
876 | net_spot = host_spot; | |
877 | break; | |
878 | case CIPSO_V4_MAP_STD: | |
446fda4f PM |
879 | if (host_spot >= host_cat_size) |
880 | return -EPERM; | |
446fda4f | 881 | net_spot = host_cat_array[host_spot]; |
9fade4bf PM |
882 | if (net_spot >= CIPSO_V4_INV_CAT) |
883 | return -EPERM; | |
02752760 | 884 | break; |
446fda4f | 885 | } |
02752760 PM |
886 | if (net_spot >= net_clen_bits) |
887 | return -ENOSPC; | |
888 | cipso_v4_bitmap_setbit(net_cat, net_spot, 1); | |
446fda4f | 889 | |
02752760 PM |
890 | if (net_spot > net_spot_max) |
891 | net_spot_max = net_spot; | |
446fda4f PM |
892 | } |
893 | ||
02752760 PM |
894 | if (++net_spot_max % 8) |
895 | return net_spot_max / 8 + 1; | |
896 | return net_spot_max / 8; | |
446fda4f PM |
897 | } |
898 | ||
899 | /** | |
900 | * cipso_v4_map_cat_rbm_ntoh - Perform a category mapping from network to host | |
901 | * @doi_def: the DOI definition | |
902 | * @net_cat: the category bitmap in network/CIPSO format | |
903 | * @net_cat_len: the length of the CIPSO bitmap in bytes | |
02752760 | 904 | * @secattr: the security attributes |
446fda4f PM |
905 | * |
906 | * Description: | |
907 | * Perform a label mapping to translate a CIPSO bitmap to the correct local | |
02752760 PM |
908 | * MLS category bitmap using the given DOI definition. Returns zero on |
909 | * success, negative values on failure. | |
446fda4f PM |
910 | * |
911 | */ | |
912 | static int cipso_v4_map_cat_rbm_ntoh(const struct cipso_v4_doi *doi_def, | |
913 | const unsigned char *net_cat, | |
914 | u32 net_cat_len, | |
02752760 | 915 | struct netlbl_lsm_secattr *secattr) |
446fda4f | 916 | { |
02752760 | 917 | int ret_val; |
446fda4f | 918 | int net_spot = -1; |
02752760 | 919 | u32 host_spot = CIPSO_V4_INV_CAT; |
446fda4f | 920 | u32 net_clen_bits = net_cat_len * 8; |
02752760 PM |
921 | u32 net_cat_size = 0; |
922 | u32 *net_cat_array = NULL; | |
446fda4f | 923 | |
02752760 | 924 | if (doi_def->type == CIPSO_V4_MAP_STD) { |
044a68ed PM |
925 | net_cat_size = doi_def->map.std->cat.cipso_size; |
926 | net_cat_array = doi_def->map.std->cat.cipso; | |
02752760 | 927 | } |
446fda4f | 928 | |
02752760 PM |
929 | for (;;) { |
930 | net_spot = cipso_v4_bitmap_walk(net_cat, | |
931 | net_clen_bits, | |
932 | net_spot + 1, | |
933 | 1); | |
934 | if (net_spot < 0) { | |
935 | if (net_spot == -2) | |
936 | return -EFAULT; | |
937 | return 0; | |
938 | } | |
939 | ||
940 | switch (doi_def->type) { | |
941 | case CIPSO_V4_MAP_PASS: | |
942 | host_spot = net_spot; | |
943 | break; | |
944 | case CIPSO_V4_MAP_STD: | |
945 | if (net_spot >= net_cat_size) | |
946 | return -EPERM; | |
446fda4f | 947 | host_spot = net_cat_array[net_spot]; |
9fade4bf PM |
948 | if (host_spot >= CIPSO_V4_INV_CAT) |
949 | return -EPERM; | |
02752760 | 950 | break; |
446fda4f | 951 | } |
16efd454 | 952 | ret_val = netlbl_secattr_catmap_setbit(secattr->attr.mls.cat, |
02752760 PM |
953 | host_spot, |
954 | GFP_ATOMIC); | |
955 | if (ret_val != 0) | |
956 | return ret_val; | |
446fda4f PM |
957 | } |
958 | ||
959 | return -EINVAL; | |
960 | } | |
961 | ||
654bbc2a PM |
962 | /** |
963 | * cipso_v4_map_cat_enum_valid - Checks to see if the categories are valid | |
964 | * @doi_def: the DOI definition | |
965 | * @enumcat: category list | |
966 | * @enumcat_len: length of the category list in bytes | |
967 | * | |
968 | * Description: | |
969 | * Checks the given categories against the given DOI definition and returns a | |
970 | * negative value if any of the categories do not have a valid mapping and a | |
971 | * zero value if all of the categories are valid. | |
972 | * | |
973 | */ | |
974 | static int cipso_v4_map_cat_enum_valid(const struct cipso_v4_doi *doi_def, | |
975 | const unsigned char *enumcat, | |
976 | u32 enumcat_len) | |
977 | { | |
978 | u16 cat; | |
979 | int cat_prev = -1; | |
980 | u32 iter; | |
981 | ||
982 | if (doi_def->type != CIPSO_V4_MAP_PASS || enumcat_len & 0x01) | |
983 | return -EFAULT; | |
984 | ||
985 | for (iter = 0; iter < enumcat_len; iter += 2) { | |
50e5d35c | 986 | cat = ntohs(get_unaligned((__be16 *)&enumcat[iter])); |
654bbc2a PM |
987 | if (cat <= cat_prev) |
988 | return -EFAULT; | |
989 | cat_prev = cat; | |
990 | } | |
991 | ||
992 | return 0; | |
993 | } | |
994 | ||
995 | /** | |
996 | * cipso_v4_map_cat_enum_hton - Perform a category mapping from host to network | |
997 | * @doi_def: the DOI definition | |
998 | * @secattr: the security attributes | |
999 | * @net_cat: the zero'd out category list in network/CIPSO format | |
1000 | * @net_cat_len: the length of the CIPSO category list in bytes | |
1001 | * | |
1002 | * Description: | |
1003 | * Perform a label mapping to translate a local MLS category bitmap to the | |
1004 | * correct CIPSO category list using the given DOI definition. Returns the | |
1005 | * size in bytes of the network category bitmap on success, negative values | |
1006 | * otherwise. | |
1007 | * | |
1008 | */ | |
1009 | static int cipso_v4_map_cat_enum_hton(const struct cipso_v4_doi *doi_def, | |
1010 | const struct netlbl_lsm_secattr *secattr, | |
1011 | unsigned char *net_cat, | |
1012 | u32 net_cat_len) | |
1013 | { | |
1014 | int cat = -1; | |
1015 | u32 cat_iter = 0; | |
1016 | ||
1017 | for (;;) { | |
16efd454 PM |
1018 | cat = netlbl_secattr_catmap_walk(secattr->attr.mls.cat, |
1019 | cat + 1); | |
654bbc2a PM |
1020 | if (cat < 0) |
1021 | break; | |
1022 | if ((cat_iter + 2) > net_cat_len) | |
1023 | return -ENOSPC; | |
1024 | ||
1025 | *((__be16 *)&net_cat[cat_iter]) = htons(cat); | |
1026 | cat_iter += 2; | |
1027 | } | |
1028 | ||
1029 | return cat_iter; | |
1030 | } | |
1031 | ||
1032 | /** | |
1033 | * cipso_v4_map_cat_enum_ntoh - Perform a category mapping from network to host | |
1034 | * @doi_def: the DOI definition | |
1035 | * @net_cat: the category list in network/CIPSO format | |
1036 | * @net_cat_len: the length of the CIPSO bitmap in bytes | |
1037 | * @secattr: the security attributes | |
1038 | * | |
1039 | * Description: | |
1040 | * Perform a label mapping to translate a CIPSO category list to the correct | |
1041 | * local MLS category bitmap using the given DOI definition. Returns zero on | |
1042 | * success, negative values on failure. | |
1043 | * | |
1044 | */ | |
1045 | static int cipso_v4_map_cat_enum_ntoh(const struct cipso_v4_doi *doi_def, | |
1046 | const unsigned char *net_cat, | |
1047 | u32 net_cat_len, | |
1048 | struct netlbl_lsm_secattr *secattr) | |
1049 | { | |
1050 | int ret_val; | |
1051 | u32 iter; | |
1052 | ||
1053 | for (iter = 0; iter < net_cat_len; iter += 2) { | |
16efd454 | 1054 | ret_val = netlbl_secattr_catmap_setbit(secattr->attr.mls.cat, |
50e5d35c PM |
1055 | ntohs(get_unaligned((__be16 *)&net_cat[iter])), |
1056 | GFP_ATOMIC); | |
654bbc2a PM |
1057 | if (ret_val != 0) |
1058 | return ret_val; | |
1059 | } | |
1060 | ||
1061 | return 0; | |
1062 | } | |
1063 | ||
484b3669 PM |
1064 | /** |
1065 | * cipso_v4_map_cat_rng_valid - Checks to see if the categories are valid | |
1066 | * @doi_def: the DOI definition | |
1067 | * @rngcat: category list | |
1068 | * @rngcat_len: length of the category list in bytes | |
1069 | * | |
1070 | * Description: | |
1071 | * Checks the given categories against the given DOI definition and returns a | |
1072 | * negative value if any of the categories do not have a valid mapping and a | |
1073 | * zero value if all of the categories are valid. | |
1074 | * | |
1075 | */ | |
1076 | static int cipso_v4_map_cat_rng_valid(const struct cipso_v4_doi *doi_def, | |
1077 | const unsigned char *rngcat, | |
1078 | u32 rngcat_len) | |
1079 | { | |
1080 | u16 cat_high; | |
1081 | u16 cat_low; | |
1082 | u32 cat_prev = CIPSO_V4_MAX_REM_CATS + 1; | |
1083 | u32 iter; | |
1084 | ||
1085 | if (doi_def->type != CIPSO_V4_MAP_PASS || rngcat_len & 0x01) | |
1086 | return -EFAULT; | |
1087 | ||
1088 | for (iter = 0; iter < rngcat_len; iter += 4) { | |
50e5d35c | 1089 | cat_high = ntohs(get_unaligned((__be16 *)&rngcat[iter])); |
484b3669 | 1090 | if ((iter + 4) <= rngcat_len) |
50e5d35c PM |
1091 | cat_low = ntohs( |
1092 | get_unaligned((__be16 *)&rngcat[iter + 2])); | |
484b3669 PM |
1093 | else |
1094 | cat_low = 0; | |
1095 | ||
1096 | if (cat_high > cat_prev) | |
1097 | return -EFAULT; | |
1098 | ||
1099 | cat_prev = cat_low; | |
1100 | } | |
1101 | ||
1102 | return 0; | |
1103 | } | |
1104 | ||
1105 | /** | |
1106 | * cipso_v4_map_cat_rng_hton - Perform a category mapping from host to network | |
1107 | * @doi_def: the DOI definition | |
1108 | * @secattr: the security attributes | |
1109 | * @net_cat: the zero'd out category list in network/CIPSO format | |
1110 | * @net_cat_len: the length of the CIPSO category list in bytes | |
1111 | * | |
1112 | * Description: | |
1113 | * Perform a label mapping to translate a local MLS category bitmap to the | |
1114 | * correct CIPSO category list using the given DOI definition. Returns the | |
1115 | * size in bytes of the network category bitmap on success, negative values | |
1116 | * otherwise. | |
1117 | * | |
1118 | */ | |
1119 | static int cipso_v4_map_cat_rng_hton(const struct cipso_v4_doi *doi_def, | |
1120 | const struct netlbl_lsm_secattr *secattr, | |
1121 | unsigned char *net_cat, | |
1122 | u32 net_cat_len) | |
1123 | { | |
484b3669 | 1124 | int iter = -1; |
f998e8cb | 1125 | u16 array[CIPSO_V4_TAG_RNG_CAT_MAX * 2]; |
484b3669 PM |
1126 | u32 array_cnt = 0; |
1127 | u32 cat_size = 0; | |
1128 | ||
f998e8cb | 1129 | /* make sure we don't overflow the 'array[]' variable */ |
128c6b6c PM |
1130 | if (net_cat_len > |
1131 | (CIPSO_V4_OPT_LEN_MAX - CIPSO_V4_HDR_LEN - CIPSO_V4_TAG_RNG_BLEN)) | |
1132 | return -ENOSPC; | |
484b3669 PM |
1133 | |
1134 | for (;;) { | |
16efd454 PM |
1135 | iter = netlbl_secattr_catmap_walk(secattr->attr.mls.cat, |
1136 | iter + 1); | |
484b3669 PM |
1137 | if (iter < 0) |
1138 | break; | |
1139 | cat_size += (iter == 0 ? 0 : sizeof(u16)); | |
1140 | if (cat_size > net_cat_len) | |
1141 | return -ENOSPC; | |
1142 | array[array_cnt++] = iter; | |
1143 | ||
16efd454 PM |
1144 | iter = netlbl_secattr_catmap_walk_rng(secattr->attr.mls.cat, |
1145 | iter); | |
484b3669 PM |
1146 | if (iter < 0) |
1147 | return -EFAULT; | |
1148 | cat_size += sizeof(u16); | |
1149 | if (cat_size > net_cat_len) | |
1150 | return -ENOSPC; | |
1151 | array[array_cnt++] = iter; | |
1152 | } | |
1153 | ||
1154 | for (iter = 0; array_cnt > 0;) { | |
1155 | *((__be16 *)&net_cat[iter]) = htons(array[--array_cnt]); | |
1156 | iter += 2; | |
1157 | array_cnt--; | |
1158 | if (array[array_cnt] != 0) { | |
1159 | *((__be16 *)&net_cat[iter]) = htons(array[array_cnt]); | |
1160 | iter += 2; | |
1161 | } | |
1162 | } | |
1163 | ||
1164 | return cat_size; | |
1165 | } | |
1166 | ||
1167 | /** | |
1168 | * cipso_v4_map_cat_rng_ntoh - Perform a category mapping from network to host | |
1169 | * @doi_def: the DOI definition | |
1170 | * @net_cat: the category list in network/CIPSO format | |
1171 | * @net_cat_len: the length of the CIPSO bitmap in bytes | |
1172 | * @secattr: the security attributes | |
1173 | * | |
1174 | * Description: | |
1175 | * Perform a label mapping to translate a CIPSO category list to the correct | |
1176 | * local MLS category bitmap using the given DOI definition. Returns zero on | |
1177 | * success, negative values on failure. | |
1178 | * | |
1179 | */ | |
1180 | static int cipso_v4_map_cat_rng_ntoh(const struct cipso_v4_doi *doi_def, | |
1181 | const unsigned char *net_cat, | |
1182 | u32 net_cat_len, | |
1183 | struct netlbl_lsm_secattr *secattr) | |
1184 | { | |
1185 | int ret_val; | |
1186 | u32 net_iter; | |
1187 | u16 cat_low; | |
1188 | u16 cat_high; | |
1189 | ||
132adf54 | 1190 | for (net_iter = 0; net_iter < net_cat_len; net_iter += 4) { |
50e5d35c | 1191 | cat_high = ntohs(get_unaligned((__be16 *)&net_cat[net_iter])); |
484b3669 | 1192 | if ((net_iter + 4) <= net_cat_len) |
50e5d35c PM |
1193 | cat_low = ntohs( |
1194 | get_unaligned((__be16 *)&net_cat[net_iter + 2])); | |
484b3669 PM |
1195 | else |
1196 | cat_low = 0; | |
1197 | ||
16efd454 | 1198 | ret_val = netlbl_secattr_catmap_setrng(secattr->attr.mls.cat, |
484b3669 PM |
1199 | cat_low, |
1200 | cat_high, | |
1201 | GFP_ATOMIC); | |
1202 | if (ret_val != 0) | |
1203 | return ret_val; | |
1204 | } | |
1205 | ||
1206 | return 0; | |
1207 | } | |
1208 | ||
446fda4f PM |
1209 | /* |
1210 | * Protocol Handling Functions | |
1211 | */ | |
1212 | ||
446fda4f PM |
1213 | /** |
1214 | * cipso_v4_gentag_hdr - Generate a CIPSO option header | |
1215 | * @doi_def: the DOI definition | |
91b1ed0a | 1216 | * @len: the total tag length in bytes, not including this header |
446fda4f PM |
1217 | * @buf: the CIPSO option buffer |
1218 | * | |
1219 | * Description: | |
91b1ed0a | 1220 | * Write a CIPSO header into the beginning of @buffer. |
446fda4f PM |
1221 | * |
1222 | */ | |
91b1ed0a PM |
1223 | static void cipso_v4_gentag_hdr(const struct cipso_v4_doi *doi_def, |
1224 | unsigned char *buf, | |
1225 | u32 len) | |
446fda4f | 1226 | { |
446fda4f PM |
1227 | buf[0] = IPOPT_CIPSO; |
1228 | buf[1] = CIPSO_V4_HDR_LEN + len; | |
714e85be | 1229 | *(__be32 *)&buf[2] = htonl(doi_def->doi); |
446fda4f PM |
1230 | } |
1231 | ||
446fda4f PM |
1232 | /** |
1233 | * cipso_v4_gentag_rbm - Generate a CIPSO restricted bitmap tag (type #1) | |
1234 | * @doi_def: the DOI definition | |
1235 | * @secattr: the security attributes | |
1236 | * @buffer: the option buffer | |
1237 | * @buffer_len: length of buffer in bytes | |
1238 | * | |
1239 | * Description: | |
1240 | * Generate a CIPSO option using the restricted bitmap tag, tag type #1. The | |
1241 | * actual buffer length may be larger than the indicated size due to | |
91b1ed0a PM |
1242 | * translation between host and network category bitmaps. Returns the size of |
1243 | * the tag on success, negative values on failure. | |
446fda4f PM |
1244 | * |
1245 | */ | |
1246 | static int cipso_v4_gentag_rbm(const struct cipso_v4_doi *doi_def, | |
1247 | const struct netlbl_lsm_secattr *secattr, | |
91b1ed0a PM |
1248 | unsigned char *buffer, |
1249 | u32 buffer_len) | |
446fda4f | 1250 | { |
701a90ba | 1251 | int ret_val; |
91b1ed0a | 1252 | u32 tag_len; |
446fda4f PM |
1253 | u32 level; |
1254 | ||
701a90ba PM |
1255 | if ((secattr->flags & NETLBL_SECATTR_MLS_LVL) == 0) |
1256 | return -EPERM; | |
1257 | ||
16efd454 PM |
1258 | ret_val = cipso_v4_map_lvl_hton(doi_def, |
1259 | secattr->attr.mls.lvl, | |
1260 | &level); | |
91b1ed0a PM |
1261 | if (ret_val != 0) |
1262 | return ret_val; | |
446fda4f | 1263 | |
91b1ed0a | 1264 | if (secattr->flags & NETLBL_SECATTR_MLS_CAT) { |
446fda4f | 1265 | ret_val = cipso_v4_map_cat_rbm_hton(doi_def, |
02752760 | 1266 | secattr, |
91b1ed0a PM |
1267 | &buffer[4], |
1268 | buffer_len - 4); | |
446fda4f | 1269 | if (ret_val < 0) |
91b1ed0a | 1270 | return ret_val; |
446fda4f PM |
1271 | |
1272 | /* This will send packets using the "optimized" format when | |
1273 | * possibile as specified in section 3.4.2.6 of the | |
1274 | * CIPSO draft. */ | |
701a90ba | 1275 | if (cipso_v4_rbm_optfmt && ret_val > 0 && ret_val <= 10) |
91b1ed0a | 1276 | tag_len = 14; |
701a90ba | 1277 | else |
91b1ed0a PM |
1278 | tag_len = 4 + ret_val; |
1279 | } else | |
1280 | tag_len = 4; | |
446fda4f | 1281 | |
91b1ed0a PM |
1282 | buffer[0] = 0x01; |
1283 | buffer[1] = tag_len; | |
1284 | buffer[3] = level; | |
446fda4f | 1285 | |
91b1ed0a | 1286 | return tag_len; |
446fda4f PM |
1287 | } |
1288 | ||
1289 | /** | |
1290 | * cipso_v4_parsetag_rbm - Parse a CIPSO restricted bitmap tag | |
1291 | * @doi_def: the DOI definition | |
1292 | * @tag: the CIPSO tag | |
1293 | * @secattr: the security attributes | |
1294 | * | |
1295 | * Description: | |
1296 | * Parse a CIPSO restricted bitmap tag (tag type #1) and return the security | |
1297 | * attributes in @secattr. Return zero on success, negatives values on | |
1298 | * failure. | |
1299 | * | |
1300 | */ | |
1301 | static int cipso_v4_parsetag_rbm(const struct cipso_v4_doi *doi_def, | |
1302 | const unsigned char *tag, | |
1303 | struct netlbl_lsm_secattr *secattr) | |
1304 | { | |
1305 | int ret_val; | |
1306 | u8 tag_len = tag[1]; | |
1307 | u32 level; | |
1308 | ||
1309 | ret_val = cipso_v4_map_lvl_ntoh(doi_def, tag[3], &level); | |
1310 | if (ret_val != 0) | |
1311 | return ret_val; | |
16efd454 | 1312 | secattr->attr.mls.lvl = level; |
701a90ba | 1313 | secattr->flags |= NETLBL_SECATTR_MLS_LVL; |
446fda4f PM |
1314 | |
1315 | if (tag_len > 4) { | |
16efd454 PM |
1316 | secattr->attr.mls.cat = |
1317 | netlbl_secattr_catmap_alloc(GFP_ATOMIC); | |
1318 | if (secattr->attr.mls.cat == NULL) | |
446fda4f PM |
1319 | return -ENOMEM; |
1320 | ||
1321 | ret_val = cipso_v4_map_cat_rbm_ntoh(doi_def, | |
1322 | &tag[4], | |
1323 | tag_len - 4, | |
02752760 PM |
1324 | secattr); |
1325 | if (ret_val != 0) { | |
16efd454 | 1326 | netlbl_secattr_catmap_free(secattr->attr.mls.cat); |
446fda4f PM |
1327 | return ret_val; |
1328 | } | |
02752760 PM |
1329 | |
1330 | secattr->flags |= NETLBL_SECATTR_MLS_CAT; | |
446fda4f PM |
1331 | } |
1332 | ||
1333 | return 0; | |
1334 | } | |
1335 | ||
654bbc2a PM |
1336 | /** |
1337 | * cipso_v4_gentag_enum - Generate a CIPSO enumerated tag (type #2) | |
1338 | * @doi_def: the DOI definition | |
1339 | * @secattr: the security attributes | |
1340 | * @buffer: the option buffer | |
1341 | * @buffer_len: length of buffer in bytes | |
1342 | * | |
1343 | * Description: | |
1344 | * Generate a CIPSO option using the enumerated tag, tag type #2. Returns the | |
1345 | * size of the tag on success, negative values on failure. | |
1346 | * | |
1347 | */ | |
1348 | static int cipso_v4_gentag_enum(const struct cipso_v4_doi *doi_def, | |
1349 | const struct netlbl_lsm_secattr *secattr, | |
1350 | unsigned char *buffer, | |
1351 | u32 buffer_len) | |
1352 | { | |
1353 | int ret_val; | |
1354 | u32 tag_len; | |
1355 | u32 level; | |
1356 | ||
1357 | if (!(secattr->flags & NETLBL_SECATTR_MLS_LVL)) | |
1358 | return -EPERM; | |
1359 | ||
16efd454 PM |
1360 | ret_val = cipso_v4_map_lvl_hton(doi_def, |
1361 | secattr->attr.mls.lvl, | |
1362 | &level); | |
654bbc2a PM |
1363 | if (ret_val != 0) |
1364 | return ret_val; | |
1365 | ||
1366 | if (secattr->flags & NETLBL_SECATTR_MLS_CAT) { | |
1367 | ret_val = cipso_v4_map_cat_enum_hton(doi_def, | |
1368 | secattr, | |
1369 | &buffer[4], | |
1370 | buffer_len - 4); | |
1371 | if (ret_val < 0) | |
1372 | return ret_val; | |
1373 | ||
1374 | tag_len = 4 + ret_val; | |
1375 | } else | |
1376 | tag_len = 4; | |
1377 | ||
1378 | buffer[0] = 0x02; | |
1379 | buffer[1] = tag_len; | |
1380 | buffer[3] = level; | |
1381 | ||
1382 | return tag_len; | |
1383 | } | |
1384 | ||
1385 | /** | |
1386 | * cipso_v4_parsetag_enum - Parse a CIPSO enumerated tag | |
1387 | * @doi_def: the DOI definition | |
1388 | * @tag: the CIPSO tag | |
1389 | * @secattr: the security attributes | |
1390 | * | |
1391 | * Description: | |
1392 | * Parse a CIPSO enumerated tag (tag type #2) and return the security | |
1393 | * attributes in @secattr. Return zero on success, negatives values on | |
1394 | * failure. | |
1395 | * | |
1396 | */ | |
1397 | static int cipso_v4_parsetag_enum(const struct cipso_v4_doi *doi_def, | |
1398 | const unsigned char *tag, | |
1399 | struct netlbl_lsm_secattr *secattr) | |
1400 | { | |
1401 | int ret_val; | |
1402 | u8 tag_len = tag[1]; | |
1403 | u32 level; | |
1404 | ||
1405 | ret_val = cipso_v4_map_lvl_ntoh(doi_def, tag[3], &level); | |
1406 | if (ret_val != 0) | |
1407 | return ret_val; | |
16efd454 | 1408 | secattr->attr.mls.lvl = level; |
654bbc2a PM |
1409 | secattr->flags |= NETLBL_SECATTR_MLS_LVL; |
1410 | ||
1411 | if (tag_len > 4) { | |
16efd454 PM |
1412 | secattr->attr.mls.cat = |
1413 | netlbl_secattr_catmap_alloc(GFP_ATOMIC); | |
1414 | if (secattr->attr.mls.cat == NULL) | |
654bbc2a PM |
1415 | return -ENOMEM; |
1416 | ||
1417 | ret_val = cipso_v4_map_cat_enum_ntoh(doi_def, | |
1418 | &tag[4], | |
1419 | tag_len - 4, | |
1420 | secattr); | |
1421 | if (ret_val != 0) { | |
16efd454 | 1422 | netlbl_secattr_catmap_free(secattr->attr.mls.cat); |
654bbc2a PM |
1423 | return ret_val; |
1424 | } | |
1425 | ||
1426 | secattr->flags |= NETLBL_SECATTR_MLS_CAT; | |
1427 | } | |
1428 | ||
1429 | return 0; | |
1430 | } | |
1431 | ||
484b3669 PM |
1432 | /** |
1433 | * cipso_v4_gentag_rng - Generate a CIPSO ranged tag (type #5) | |
1434 | * @doi_def: the DOI definition | |
1435 | * @secattr: the security attributes | |
1436 | * @buffer: the option buffer | |
1437 | * @buffer_len: length of buffer in bytes | |
1438 | * | |
1439 | * Description: | |
1440 | * Generate a CIPSO option using the ranged tag, tag type #5. Returns the | |
1441 | * size of the tag on success, negative values on failure. | |
1442 | * | |
1443 | */ | |
1444 | static int cipso_v4_gentag_rng(const struct cipso_v4_doi *doi_def, | |
1445 | const struct netlbl_lsm_secattr *secattr, | |
1446 | unsigned char *buffer, | |
1447 | u32 buffer_len) | |
1448 | { | |
1449 | int ret_val; | |
1450 | u32 tag_len; | |
1451 | u32 level; | |
1452 | ||
1453 | if (!(secattr->flags & NETLBL_SECATTR_MLS_LVL)) | |
1454 | return -EPERM; | |
1455 | ||
16efd454 PM |
1456 | ret_val = cipso_v4_map_lvl_hton(doi_def, |
1457 | secattr->attr.mls.lvl, | |
1458 | &level); | |
484b3669 PM |
1459 | if (ret_val != 0) |
1460 | return ret_val; | |
1461 | ||
1462 | if (secattr->flags & NETLBL_SECATTR_MLS_CAT) { | |
1463 | ret_val = cipso_v4_map_cat_rng_hton(doi_def, | |
1464 | secattr, | |
1465 | &buffer[4], | |
1466 | buffer_len - 4); | |
1467 | if (ret_val < 0) | |
1468 | return ret_val; | |
1469 | ||
1470 | tag_len = 4 + ret_val; | |
1471 | } else | |
1472 | tag_len = 4; | |
1473 | ||
1474 | buffer[0] = 0x05; | |
1475 | buffer[1] = tag_len; | |
1476 | buffer[3] = level; | |
1477 | ||
1478 | return tag_len; | |
1479 | } | |
1480 | ||
1481 | /** | |
1482 | * cipso_v4_parsetag_rng - Parse a CIPSO ranged tag | |
1483 | * @doi_def: the DOI definition | |
1484 | * @tag: the CIPSO tag | |
1485 | * @secattr: the security attributes | |
1486 | * | |
1487 | * Description: | |
1488 | * Parse a CIPSO ranged tag (tag type #5) and return the security attributes | |
1489 | * in @secattr. Return zero on success, negatives values on failure. | |
1490 | * | |
1491 | */ | |
1492 | static int cipso_v4_parsetag_rng(const struct cipso_v4_doi *doi_def, | |
1493 | const unsigned char *tag, | |
1494 | struct netlbl_lsm_secattr *secattr) | |
1495 | { | |
1496 | int ret_val; | |
1497 | u8 tag_len = tag[1]; | |
1498 | u32 level; | |
1499 | ||
1500 | ret_val = cipso_v4_map_lvl_ntoh(doi_def, tag[3], &level); | |
1501 | if (ret_val != 0) | |
1502 | return ret_val; | |
16efd454 | 1503 | secattr->attr.mls.lvl = level; |
484b3669 PM |
1504 | secattr->flags |= NETLBL_SECATTR_MLS_LVL; |
1505 | ||
1506 | if (tag_len > 4) { | |
16efd454 PM |
1507 | secattr->attr.mls.cat = |
1508 | netlbl_secattr_catmap_alloc(GFP_ATOMIC); | |
1509 | if (secattr->attr.mls.cat == NULL) | |
484b3669 PM |
1510 | return -ENOMEM; |
1511 | ||
1512 | ret_val = cipso_v4_map_cat_rng_ntoh(doi_def, | |
1513 | &tag[4], | |
1514 | tag_len - 4, | |
1515 | secattr); | |
1516 | if (ret_val != 0) { | |
16efd454 | 1517 | netlbl_secattr_catmap_free(secattr->attr.mls.cat); |
484b3669 PM |
1518 | return ret_val; |
1519 | } | |
1520 | ||
1521 | secattr->flags |= NETLBL_SECATTR_MLS_CAT; | |
1522 | } | |
1523 | ||
1524 | return 0; | |
1525 | } | |
1526 | ||
446fda4f PM |
1527 | /** |
1528 | * cipso_v4_validate - Validate a CIPSO option | |
1529 | * @option: the start of the option, on error it is set to point to the error | |
1530 | * | |
1531 | * Description: | |
1532 | * This routine is called to validate a CIPSO option, it checks all of the | |
1533 | * fields to ensure that they are at least valid, see the draft snippet below | |
1534 | * for details. If the option is valid then a zero value is returned and | |
1535 | * the value of @option is unchanged. If the option is invalid then a | |
1536 | * non-zero value is returned and @option is adjusted to point to the | |
1537 | * offending portion of the option. From the IETF draft ... | |
1538 | * | |
1539 | * "If any field within the CIPSO options, such as the DOI identifier, is not | |
1540 | * recognized the IP datagram is discarded and an ICMP 'parameter problem' | |
1541 | * (type 12) is generated and returned. The ICMP code field is set to 'bad | |
1542 | * parameter' (code 0) and the pointer is set to the start of the CIPSO field | |
1543 | * that is unrecognized." | |
1544 | * | |
1545 | */ | |
1546 | int cipso_v4_validate(unsigned char **option) | |
1547 | { | |
1548 | unsigned char *opt = *option; | |
1549 | unsigned char *tag; | |
1550 | unsigned char opt_iter; | |
1551 | unsigned char err_offset = 0; | |
1552 | u8 opt_len; | |
1553 | u8 tag_len; | |
1554 | struct cipso_v4_doi *doi_def = NULL; | |
1555 | u32 tag_iter; | |
1556 | ||
1557 | /* caller already checks for length values that are too large */ | |
1558 | opt_len = opt[1]; | |
1559 | if (opt_len < 8) { | |
1560 | err_offset = 1; | |
1561 | goto validate_return; | |
1562 | } | |
1563 | ||
1564 | rcu_read_lock(); | |
50e5d35c | 1565 | doi_def = cipso_v4_doi_search(ntohl(get_unaligned((__be32 *)&opt[2]))); |
446fda4f PM |
1566 | if (doi_def == NULL) { |
1567 | err_offset = 2; | |
1568 | goto validate_return_locked; | |
1569 | } | |
1570 | ||
1571 | opt_iter = 6; | |
1572 | tag = opt + opt_iter; | |
1573 | while (opt_iter < opt_len) { | |
1574 | for (tag_iter = 0; doi_def->tags[tag_iter] != tag[0];) | |
1575 | if (doi_def->tags[tag_iter] == CIPSO_V4_TAG_INVALID || | |
1576 | ++tag_iter == CIPSO_V4_TAG_MAXCNT) { | |
1577 | err_offset = opt_iter; | |
1578 | goto validate_return_locked; | |
1579 | } | |
1580 | ||
1581 | tag_len = tag[1]; | |
1582 | if (tag_len > (opt_len - opt_iter)) { | |
1583 | err_offset = opt_iter + 1; | |
1584 | goto validate_return_locked; | |
1585 | } | |
1586 | ||
1587 | switch (tag[0]) { | |
1588 | case CIPSO_V4_TAG_RBITMAP: | |
1589 | if (tag_len < 4) { | |
1590 | err_offset = opt_iter + 1; | |
1591 | goto validate_return_locked; | |
1592 | } | |
1593 | ||
1594 | /* We are already going to do all the verification | |
1595 | * necessary at the socket layer so from our point of | |
1596 | * view it is safe to turn these checks off (and less | |
1597 | * work), however, the CIPSO draft says we should do | |
1598 | * all the CIPSO validations here but it doesn't | |
1599 | * really specify _exactly_ what we need to validate | |
1600 | * ... so, just make it a sysctl tunable. */ | |
1601 | if (cipso_v4_rbm_strictvalid) { | |
1602 | if (cipso_v4_map_lvl_valid(doi_def, | |
1603 | tag[3]) < 0) { | |
1604 | err_offset = opt_iter + 3; | |
1605 | goto validate_return_locked; | |
1606 | } | |
1607 | if (tag_len > 4 && | |
1608 | cipso_v4_map_cat_rbm_valid(doi_def, | |
1609 | &tag[4], | |
1610 | tag_len - 4) < 0) { | |
1611 | err_offset = opt_iter + 4; | |
1612 | goto validate_return_locked; | |
1613 | } | |
1614 | } | |
1615 | break; | |
654bbc2a PM |
1616 | case CIPSO_V4_TAG_ENUM: |
1617 | if (tag_len < 4) { | |
1618 | err_offset = opt_iter + 1; | |
1619 | goto validate_return_locked; | |
1620 | } | |
1621 | ||
1622 | if (cipso_v4_map_lvl_valid(doi_def, | |
1623 | tag[3]) < 0) { | |
1624 | err_offset = opt_iter + 3; | |
1625 | goto validate_return_locked; | |
1626 | } | |
1627 | if (tag_len > 4 && | |
1628 | cipso_v4_map_cat_enum_valid(doi_def, | |
1629 | &tag[4], | |
1630 | tag_len - 4) < 0) { | |
1631 | err_offset = opt_iter + 4; | |
1632 | goto validate_return_locked; | |
1633 | } | |
1634 | break; | |
484b3669 PM |
1635 | case CIPSO_V4_TAG_RANGE: |
1636 | if (tag_len < 4) { | |
1637 | err_offset = opt_iter + 1; | |
1638 | goto validate_return_locked; | |
1639 | } | |
1640 | ||
1641 | if (cipso_v4_map_lvl_valid(doi_def, | |
1642 | tag[3]) < 0) { | |
1643 | err_offset = opt_iter + 3; | |
1644 | goto validate_return_locked; | |
1645 | } | |
1646 | if (tag_len > 4 && | |
1647 | cipso_v4_map_cat_rng_valid(doi_def, | |
1648 | &tag[4], | |
1649 | tag_len - 4) < 0) { | |
1650 | err_offset = opt_iter + 4; | |
1651 | goto validate_return_locked; | |
1652 | } | |
1653 | break; | |
446fda4f PM |
1654 | default: |
1655 | err_offset = opt_iter; | |
1656 | goto validate_return_locked; | |
1657 | } | |
1658 | ||
1659 | tag += tag_len; | |
1660 | opt_iter += tag_len; | |
1661 | } | |
1662 | ||
1663 | validate_return_locked: | |
1664 | rcu_read_unlock(); | |
1665 | validate_return: | |
1666 | *option = opt + err_offset; | |
1667 | return err_offset; | |
1668 | } | |
1669 | ||
1670 | /** | |
1671 | * cipso_v4_error - Send the correct reponse for a bad packet | |
1672 | * @skb: the packet | |
1673 | * @error: the error code | |
1674 | * @gateway: CIPSO gateway flag | |
1675 | * | |
1676 | * Description: | |
1677 | * Based on the error code given in @error, send an ICMP error message back to | |
1678 | * the originating host. From the IETF draft ... | |
1679 | * | |
1680 | * "If the contents of the CIPSO [option] are valid but the security label is | |
1681 | * outside of the configured host or port label range, the datagram is | |
1682 | * discarded and an ICMP 'destination unreachable' (type 3) is generated and | |
1683 | * returned. The code field of the ICMP is set to 'communication with | |
1684 | * destination network administratively prohibited' (code 9) or to | |
1685 | * 'communication with destination host administratively prohibited' | |
1686 | * (code 10). The value of the code is dependent on whether the originator | |
1687 | * of the ICMP message is acting as a CIPSO host or a CIPSO gateway. The | |
1688 | * recipient of the ICMP message MUST be able to handle either value. The | |
1689 | * same procedure is performed if a CIPSO [option] can not be added to an | |
1690 | * IP packet because it is too large to fit in the IP options area." | |
1691 | * | |
1692 | * "If the error is triggered by receipt of an ICMP message, the message is | |
1693 | * discarded and no response is permitted (consistent with general ICMP | |
1694 | * processing rules)." | |
1695 | * | |
1696 | */ | |
1697 | void cipso_v4_error(struct sk_buff *skb, int error, u32 gateway) | |
1698 | { | |
eddc9ec5 | 1699 | if (ip_hdr(skb)->protocol == IPPROTO_ICMP || error != -EACCES) |
446fda4f PM |
1700 | return; |
1701 | ||
1702 | if (gateway) | |
1703 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_NET_ANO, 0); | |
1704 | else | |
1705 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_ANO, 0); | |
1706 | } | |
1707 | ||
1708 | /** | |
ba6ff9f2 PM |
1709 | * cipso_v4_sock_setattr - Add a CIPSO option to a socket |
1710 | * @sk: the socket | |
446fda4f PM |
1711 | * @doi_def: the CIPSO DOI to use |
1712 | * @secattr: the specific security attributes of the socket | |
1713 | * | |
1714 | * Description: | |
1715 | * Set the CIPSO option on the given socket using the DOI definition and | |
1716 | * security attributes passed to the function. This function requires | |
ba6ff9f2 PM |
1717 | * exclusive access to @sk, which means it either needs to be in the |
1718 | * process of being created or locked. Returns zero on success and negative | |
1719 | * values on failure. | |
446fda4f PM |
1720 | * |
1721 | */ | |
ba6ff9f2 PM |
1722 | int cipso_v4_sock_setattr(struct sock *sk, |
1723 | const struct cipso_v4_doi *doi_def, | |
1724 | const struct netlbl_lsm_secattr *secattr) | |
446fda4f PM |
1725 | { |
1726 | int ret_val = -EPERM; | |
1727 | u32 iter; | |
91b1ed0a | 1728 | unsigned char *buf; |
446fda4f PM |
1729 | u32 buf_len = 0; |
1730 | u32 opt_len; | |
1731 | struct ip_options *opt = NULL; | |
446fda4f PM |
1732 | struct inet_sock *sk_inet; |
1733 | struct inet_connection_sock *sk_conn; | |
1734 | ||
1735 | /* In the case of sock_create_lite(), the sock->sk field is not | |
1736 | * defined yet but it is not a problem as the only users of these | |
1737 | * "lite" PF_INET sockets are functions which do an accept() call | |
1738 | * afterwards so we will label the socket as part of the accept(). */ | |
446fda4f PM |
1739 | if (sk == NULL) |
1740 | return 0; | |
1741 | ||
91b1ed0a PM |
1742 | /* We allocate the maximum CIPSO option size here so we are probably |
1743 | * being a little wasteful, but it makes our life _much_ easier later | |
1744 | * on and after all we are only talking about 40 bytes. */ | |
1745 | buf_len = CIPSO_V4_OPT_LEN_MAX; | |
1746 | buf = kmalloc(buf_len, GFP_ATOMIC); | |
1747 | if (buf == NULL) { | |
1748 | ret_val = -ENOMEM; | |
1749 | goto socket_setattr_failure; | |
1750 | } | |
1751 | ||
446fda4f PM |
1752 | /* XXX - This code assumes only one tag per CIPSO option which isn't |
1753 | * really a good assumption to make but since we only support the MAC | |
1754 | * tags right now it is a safe assumption. */ | |
1755 | iter = 0; | |
1756 | do { | |
91b1ed0a | 1757 | memset(buf, 0, buf_len); |
446fda4f PM |
1758 | switch (doi_def->tags[iter]) { |
1759 | case CIPSO_V4_TAG_RBITMAP: | |
1760 | ret_val = cipso_v4_gentag_rbm(doi_def, | |
91b1ed0a PM |
1761 | secattr, |
1762 | &buf[CIPSO_V4_HDR_LEN], | |
1763 | buf_len - CIPSO_V4_HDR_LEN); | |
446fda4f | 1764 | break; |
654bbc2a PM |
1765 | case CIPSO_V4_TAG_ENUM: |
1766 | ret_val = cipso_v4_gentag_enum(doi_def, | |
1767 | secattr, | |
1768 | &buf[CIPSO_V4_HDR_LEN], | |
1769 | buf_len - CIPSO_V4_HDR_LEN); | |
1770 | break; | |
484b3669 PM |
1771 | case CIPSO_V4_TAG_RANGE: |
1772 | ret_val = cipso_v4_gentag_rng(doi_def, | |
1773 | secattr, | |
1774 | &buf[CIPSO_V4_HDR_LEN], | |
1775 | buf_len - CIPSO_V4_HDR_LEN); | |
1776 | break; | |
446fda4f PM |
1777 | default: |
1778 | ret_val = -EPERM; | |
1779 | goto socket_setattr_failure; | |
1780 | } | |
1781 | ||
1782 | iter++; | |
91b1ed0a | 1783 | } while (ret_val < 0 && |
446fda4f PM |
1784 | iter < CIPSO_V4_TAG_MAXCNT && |
1785 | doi_def->tags[iter] != CIPSO_V4_TAG_INVALID); | |
91b1ed0a | 1786 | if (ret_val < 0) |
446fda4f | 1787 | goto socket_setattr_failure; |
91b1ed0a PM |
1788 | cipso_v4_gentag_hdr(doi_def, buf, ret_val); |
1789 | buf_len = CIPSO_V4_HDR_LEN + ret_val; | |
446fda4f PM |
1790 | |
1791 | /* We can't use ip_options_get() directly because it makes a call to | |
1792 | * ip_options_get_alloc() which allocates memory with GFP_KERNEL and | |
f8687afe PM |
1793 | * we won't always have CAP_NET_RAW even though we _always_ want to |
1794 | * set the IPOPT_CIPSO option. */ | |
446fda4f PM |
1795 | opt_len = (buf_len + 3) & ~3; |
1796 | opt = kzalloc(sizeof(*opt) + opt_len, GFP_ATOMIC); | |
1797 | if (opt == NULL) { | |
1798 | ret_val = -ENOMEM; | |
1799 | goto socket_setattr_failure; | |
1800 | } | |
1801 | memcpy(opt->__data, buf, buf_len); | |
1802 | opt->optlen = opt_len; | |
f8687afe | 1803 | opt->cipso = sizeof(struct iphdr); |
446fda4f PM |
1804 | kfree(buf); |
1805 | buf = NULL; | |
446fda4f PM |
1806 | |
1807 | sk_inet = inet_sk(sk); | |
1808 | if (sk_inet->is_icsk) { | |
1809 | sk_conn = inet_csk(sk); | |
1810 | if (sk_inet->opt) | |
1811 | sk_conn->icsk_ext_hdr_len -= sk_inet->opt->optlen; | |
1812 | sk_conn->icsk_ext_hdr_len += opt->optlen; | |
1813 | sk_conn->icsk_sync_mss(sk, sk_conn->icsk_pmtu_cookie); | |
1814 | } | |
1815 | opt = xchg(&sk_inet->opt, opt); | |
1816 | kfree(opt); | |
1817 | ||
1818 | return 0; | |
1819 | ||
1820 | socket_setattr_failure: | |
1821 | kfree(buf); | |
1822 | kfree(opt); | |
1823 | return ret_val; | |
1824 | } | |
1825 | ||
1826 | /** | |
63d804ea PM |
1827 | * cipso_v4_getattr - Helper function for the cipso_v4_*_getattr functions |
1828 | * @cipso: the CIPSO v4 option | |
446fda4f PM |
1829 | * @secattr: the security attributes |
1830 | * | |
1831 | * Description: | |
63d804ea PM |
1832 | * Inspect @cipso and return the security attributes in @secattr. Returns zero |
1833 | * on success and negative values on failure. | |
446fda4f PM |
1834 | * |
1835 | */ | |
63d804ea PM |
1836 | static int cipso_v4_getattr(const unsigned char *cipso, |
1837 | struct netlbl_lsm_secattr *secattr) | |
446fda4f PM |
1838 | { |
1839 | int ret_val = -ENOMSG; | |
446fda4f PM |
1840 | u32 doi; |
1841 | struct cipso_v4_doi *doi_def; | |
1842 | ||
63d804ea PM |
1843 | if (cipso_v4_cache_check(cipso, cipso[1], secattr) == 0) |
1844 | return 0; | |
446fda4f | 1845 | |
63d804ea | 1846 | doi = ntohl(get_unaligned((__be32 *)&cipso[2])); |
446fda4f | 1847 | rcu_read_lock(); |
9bb5fd2b | 1848 | doi_def = cipso_v4_doi_search(doi); |
63d804ea PM |
1849 | if (doi_def == NULL) |
1850 | goto getattr_return; | |
91b1ed0a PM |
1851 | /* XXX - This code assumes only one tag per CIPSO option which isn't |
1852 | * really a good assumption to make but since we only support the MAC | |
1853 | * tags right now it is a safe assumption. */ | |
63d804ea | 1854 | switch (cipso[6]) { |
446fda4f | 1855 | case CIPSO_V4_TAG_RBITMAP: |
63d804ea | 1856 | ret_val = cipso_v4_parsetag_rbm(doi_def, &cipso[6], secattr); |
446fda4f | 1857 | break; |
654bbc2a | 1858 | case CIPSO_V4_TAG_ENUM: |
63d804ea | 1859 | ret_val = cipso_v4_parsetag_enum(doi_def, &cipso[6], secattr); |
654bbc2a | 1860 | break; |
484b3669 | 1861 | case CIPSO_V4_TAG_RANGE: |
63d804ea | 1862 | ret_val = cipso_v4_parsetag_rng(doi_def, &cipso[6], secattr); |
484b3669 | 1863 | break; |
446fda4f | 1864 | } |
16efd454 PM |
1865 | if (ret_val == 0) |
1866 | secattr->type = NETLBL_NLTYPE_CIPSOV4; | |
446fda4f | 1867 | |
63d804ea PM |
1868 | getattr_return: |
1869 | rcu_read_unlock(); | |
14a72f53 PM |
1870 | return ret_val; |
1871 | } | |
1872 | ||
63d804ea PM |
1873 | /** |
1874 | * cipso_v4_sock_getattr - Get the security attributes from a sock | |
1875 | * @sk: the sock | |
1876 | * @secattr: the security attributes | |
1877 | * | |
1878 | * Description: | |
1879 | * Query @sk to see if there is a CIPSO option attached to the sock and if | |
1880 | * there is return the CIPSO security attributes in @secattr. This function | |
1881 | * requires that @sk be locked, or privately held, but it does not do any | |
1882 | * locking itself. Returns zero on success and negative values on failure. | |
1883 | * | |
1884 | */ | |
1885 | int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr) | |
1886 | { | |
1887 | struct ip_options *opt; | |
1888 | ||
1889 | opt = inet_sk(sk)->opt; | |
1890 | if (opt == NULL || opt->cipso == 0) | |
1891 | return -ENOMSG; | |
1892 | ||
1893 | return cipso_v4_getattr(opt->__data + opt->cipso - sizeof(struct iphdr), | |
1894 | secattr); | |
1895 | } | |
1896 | ||
446fda4f PM |
1897 | /** |
1898 | * cipso_v4_skbuff_getattr - Get the security attributes from the CIPSO option | |
1899 | * @skb: the packet | |
1900 | * @secattr: the security attributes | |
1901 | * | |
1902 | * Description: | |
1903 | * Parse the given packet's CIPSO option and return the security attributes. | |
1904 | * Returns zero on success and negative values on failure. | |
1905 | * | |
1906 | */ | |
1907 | int cipso_v4_skbuff_getattr(const struct sk_buff *skb, | |
1908 | struct netlbl_lsm_secattr *secattr) | |
1909 | { | |
63d804ea | 1910 | return cipso_v4_getattr(CIPSO_V4_OPTPTR(skb), secattr); |
446fda4f PM |
1911 | } |
1912 | ||
1913 | /* | |
1914 | * Setup Functions | |
1915 | */ | |
1916 | ||
1917 | /** | |
1918 | * cipso_v4_init - Initialize the CIPSO module | |
1919 | * | |
1920 | * Description: | |
1921 | * Initialize the CIPSO module and prepare it for use. Returns zero on success | |
1922 | * and negative values on failure. | |
1923 | * | |
1924 | */ | |
1925 | static int __init cipso_v4_init(void) | |
1926 | { | |
1927 | int ret_val; | |
1928 | ||
1929 | ret_val = cipso_v4_cache_init(); | |
1930 | if (ret_val != 0) | |
1931 | panic("Failed to initialize the CIPSO/IPv4 cache (%d)\n", | |
1932 | ret_val); | |
1933 | ||
1934 | return 0; | |
1935 | } | |
1936 | ||
1937 | subsys_initcall(cipso_v4_init); |