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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 | |
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: | |
631dd1a8 | 12 | * http://tools.ietf.org/id/draft-ietf-cipso-ipsecurity-01.txt |
586c2500 PM |
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 | |
25985edc | 115 | * zero then it is possible to fit 8 category ranges because the zero should |
f998e8cb PM |
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 | 292 | } |
446fda4f PM |
293 | } |
294 | ||
295 | /** | |
296 | * cipso_v4_cache_check - Check the CIPSO cache for a label mapping | |
297 | * @key: the buffer to check | |
298 | * @key_len: buffer length in bytes | |
299 | * @secattr: the security attribute struct to use | |
300 | * | |
301 | * Description: | |
302 | * This function checks the cache to see if a label mapping already exists for | |
303 | * the given key. If there is a match then the cache is adjusted and the | |
304 | * @secattr struct is populated with the correct LSM security attributes. The | |
305 | * cache is adjusted in the following manner if the entry is not already the | |
306 | * first in the cache bucket: | |
307 | * | |
308 | * 1. The cache entry's activity counter is incremented | |
309 | * 2. The previous (higher ranking) entry's activity counter is decremented | |
310 | * 3. If the difference between the two activity counters is geater than | |
311 | * CIPSO_V4_CACHE_REORDERLIMIT the two entries are swapped | |
312 | * | |
313 | * Returns zero on success, -ENOENT for a cache miss, and other negative values | |
314 | * on error. | |
315 | * | |
316 | */ | |
317 | static int cipso_v4_cache_check(const unsigned char *key, | |
318 | u32 key_len, | |
319 | struct netlbl_lsm_secattr *secattr) | |
320 | { | |
321 | u32 bkt; | |
322 | struct cipso_v4_map_cache_entry *entry; | |
323 | struct cipso_v4_map_cache_entry *prev_entry = NULL; | |
324 | u32 hash; | |
325 | ||
326 | if (!cipso_v4_cache_enabled) | |
327 | return -ENOENT; | |
328 | ||
329 | hash = cipso_v4_map_cache_hash(key, key_len); | |
5e0f8923 | 330 | bkt = hash & (CIPSO_V4_CACHE_BUCKETS - 1); |
609c92fe | 331 | spin_lock_bh(&cipso_v4_cache[bkt].lock); |
446fda4f PM |
332 | list_for_each_entry(entry, &cipso_v4_cache[bkt].list, list) { |
333 | if (entry->hash == hash && | |
334 | entry->key_len == key_len && | |
335 | memcmp(entry->key, key, key_len) == 0) { | |
336 | entry->activity += 1; | |
ffb733c6 | 337 | atomic_inc(&entry->lsm_data->refcount); |
338 | secattr->cache = entry->lsm_data; | |
701a90ba | 339 | secattr->flags |= NETLBL_SECATTR_CACHE; |
16efd454 | 340 | secattr->type = NETLBL_NLTYPE_CIPSOV4; |
446fda4f | 341 | if (prev_entry == NULL) { |
609c92fe | 342 | spin_unlock_bh(&cipso_v4_cache[bkt].lock); |
446fda4f PM |
343 | return 0; |
344 | } | |
345 | ||
346 | if (prev_entry->activity > 0) | |
347 | prev_entry->activity -= 1; | |
348 | if (entry->activity > prev_entry->activity && | |
349 | entry->activity - prev_entry->activity > | |
350 | CIPSO_V4_CACHE_REORDERLIMIT) { | |
351 | __list_del(entry->list.prev, entry->list.next); | |
352 | __list_add(&entry->list, | |
353 | prev_entry->list.prev, | |
354 | &prev_entry->list); | |
355 | } | |
356 | ||
609c92fe | 357 | spin_unlock_bh(&cipso_v4_cache[bkt].lock); |
446fda4f PM |
358 | return 0; |
359 | } | |
360 | prev_entry = entry; | |
361 | } | |
609c92fe | 362 | spin_unlock_bh(&cipso_v4_cache[bkt].lock); |
446fda4f PM |
363 | |
364 | return -ENOENT; | |
365 | } | |
366 | ||
367 | /** | |
368 | * cipso_v4_cache_add - Add an entry to the CIPSO cache | |
369 | * @skb: the packet | |
370 | * @secattr: the packet's security attributes | |
371 | * | |
372 | * Description: | |
373 | * Add a new entry into the CIPSO label mapping cache. Add the new entry to | |
374 | * head of the cache bucket's list, if the cache bucket is out of room remove | |
375 | * the last entry in the list first. It is important to note that there is | |
376 | * currently no checking for duplicate keys. Returns zero on success, | |
377 | * negative values on failure. | |
378 | * | |
379 | */ | |
380 | int cipso_v4_cache_add(const struct sk_buff *skb, | |
381 | const struct netlbl_lsm_secattr *secattr) | |
382 | { | |
383 | int ret_val = -EPERM; | |
384 | u32 bkt; | |
385 | struct cipso_v4_map_cache_entry *entry = NULL; | |
386 | struct cipso_v4_map_cache_entry *old_entry = NULL; | |
387 | unsigned char *cipso_ptr; | |
388 | u32 cipso_ptr_len; | |
389 | ||
390 | if (!cipso_v4_cache_enabled || cipso_v4_cache_bucketsize <= 0) | |
391 | return 0; | |
392 | ||
393 | cipso_ptr = CIPSO_V4_OPTPTR(skb); | |
394 | cipso_ptr_len = cipso_ptr[1]; | |
395 | ||
396 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); | |
397 | if (entry == NULL) | |
398 | return -ENOMEM; | |
fac5d731 | 399 | entry->key = kmemdup(cipso_ptr, cipso_ptr_len, GFP_ATOMIC); |
446fda4f PM |
400 | if (entry->key == NULL) { |
401 | ret_val = -ENOMEM; | |
402 | goto cache_add_failure; | |
403 | } | |
446fda4f PM |
404 | entry->key_len = cipso_ptr_len; |
405 | entry->hash = cipso_v4_map_cache_hash(cipso_ptr, cipso_ptr_len); | |
ffb733c6 | 406 | atomic_inc(&secattr->cache->refcount); |
407 | entry->lsm_data = secattr->cache; | |
446fda4f | 408 | |
5e0f8923 | 409 | bkt = entry->hash & (CIPSO_V4_CACHE_BUCKETS - 1); |
609c92fe | 410 | spin_lock_bh(&cipso_v4_cache[bkt].lock); |
446fda4f PM |
411 | if (cipso_v4_cache[bkt].size < cipso_v4_cache_bucketsize) { |
412 | list_add(&entry->list, &cipso_v4_cache[bkt].list); | |
413 | cipso_v4_cache[bkt].size += 1; | |
414 | } else { | |
415 | old_entry = list_entry(cipso_v4_cache[bkt].list.prev, | |
416 | struct cipso_v4_map_cache_entry, list); | |
417 | list_del(&old_entry->list); | |
418 | list_add(&entry->list, &cipso_v4_cache[bkt].list); | |
419 | cipso_v4_cache_entry_free(old_entry); | |
420 | } | |
609c92fe | 421 | spin_unlock_bh(&cipso_v4_cache[bkt].lock); |
446fda4f PM |
422 | |
423 | return 0; | |
424 | ||
425 | cache_add_failure: | |
426 | if (entry) | |
427 | cipso_v4_cache_entry_free(entry); | |
428 | return ret_val; | |
429 | } | |
430 | ||
431 | /* | |
432 | * DOI List Functions | |
433 | */ | |
434 | ||
435 | /** | |
436 | * cipso_v4_doi_search - Searches for a DOI definition | |
437 | * @doi: the DOI to search for | |
438 | * | |
439 | * Description: | |
440 | * Search the DOI definition list for a DOI definition with a DOI value that | |
25985edc | 441 | * matches @doi. The caller is responsible for calling rcu_read_[un]lock(). |
446fda4f PM |
442 | * Returns a pointer to the DOI definition on success and NULL on failure. |
443 | */ | |
444 | static struct cipso_v4_doi *cipso_v4_doi_search(u32 doi) | |
445 | { | |
446 | struct cipso_v4_doi *iter; | |
447 | ||
448 | list_for_each_entry_rcu(iter, &cipso_v4_doi_list, list) | |
b1edeb10 | 449 | if (iter->doi == doi && atomic_read(&iter->refcount)) |
446fda4f PM |
450 | return iter; |
451 | return NULL; | |
452 | } | |
453 | ||
454 | /** | |
455 | * cipso_v4_doi_add - Add a new DOI to the CIPSO protocol engine | |
456 | * @doi_def: the DOI structure | |
6c2e8ac0 | 457 | * @audit_info: NetLabel audit information |
446fda4f PM |
458 | * |
459 | * Description: | |
460 | * The caller defines a new DOI for use by the CIPSO engine and calls this | |
461 | * function to add it to the list of acceptable domains. The caller must | |
462 | * ensure that the mapping table specified in @doi_def->map meets all of the | |
463 | * requirements of the mapping type (see cipso_ipv4.h for details). Returns | |
464 | * zero on success and non-zero on failure. | |
465 | * | |
466 | */ | |
6c2e8ac0 PM |
467 | int cipso_v4_doi_add(struct cipso_v4_doi *doi_def, |
468 | struct netlbl_audit *audit_info) | |
446fda4f | 469 | { |
6c2e8ac0 | 470 | int ret_val = -EINVAL; |
6ce61a7c | 471 | u32 iter; |
6c2e8ac0 PM |
472 | u32 doi; |
473 | u32 doi_type; | |
474 | struct audit_buffer *audit_buf; | |
475 | ||
476 | doi = doi_def->doi; | |
477 | doi_type = doi_def->type; | |
6ce61a7c | 478 | |
446fda4f | 479 | if (doi_def == NULL || doi_def->doi == CIPSO_V4_DOI_UNKNOWN) |
6c2e8ac0 | 480 | goto doi_add_return; |
6ce61a7c PM |
481 | for (iter = 0; iter < CIPSO_V4_TAG_MAXCNT; iter++) { |
482 | switch (doi_def->tags[iter]) { | |
483 | case CIPSO_V4_TAG_RBITMAP: | |
484 | break; | |
484b3669 | 485 | case CIPSO_V4_TAG_RANGE: |
654bbc2a PM |
486 | case CIPSO_V4_TAG_ENUM: |
487 | if (doi_def->type != CIPSO_V4_MAP_PASS) | |
6c2e8ac0 | 488 | goto doi_add_return; |
654bbc2a | 489 | break; |
15c45f7b PM |
490 | case CIPSO_V4_TAG_LOCAL: |
491 | if (doi_def->type != CIPSO_V4_MAP_LOCAL) | |
6c2e8ac0 PM |
492 | goto doi_add_return; |
493 | break; | |
494 | case CIPSO_V4_TAG_INVALID: | |
495 | if (iter == 0) | |
496 | goto doi_add_return; | |
15c45f7b | 497 | break; |
6ce61a7c | 498 | default: |
6c2e8ac0 | 499 | goto doi_add_return; |
6ce61a7c PM |
500 | } |
501 | } | |
446fda4f | 502 | |
b1edeb10 | 503 | atomic_set(&doi_def->refcount, 1); |
446fda4f | 504 | |
446fda4f | 505 | spin_lock(&cipso_v4_doi_list_lock); |
6c2e8ac0 PM |
506 | if (cipso_v4_doi_search(doi_def->doi) != NULL) { |
507 | spin_unlock(&cipso_v4_doi_list_lock); | |
508 | ret_val = -EEXIST; | |
509 | goto doi_add_return; | |
510 | } | |
446fda4f PM |
511 | list_add_tail_rcu(&doi_def->list, &cipso_v4_doi_list); |
512 | spin_unlock(&cipso_v4_doi_list_lock); | |
6c2e8ac0 PM |
513 | ret_val = 0; |
514 | ||
515 | doi_add_return: | |
516 | audit_buf = netlbl_audit_start(AUDIT_MAC_CIPSOV4_ADD, audit_info); | |
517 | if (audit_buf != NULL) { | |
518 | const char *type_str; | |
519 | switch (doi_type) { | |
520 | case CIPSO_V4_MAP_TRANS: | |
521 | type_str = "trans"; | |
522 | break; | |
523 | case CIPSO_V4_MAP_PASS: | |
524 | type_str = "pass"; | |
525 | break; | |
526 | case CIPSO_V4_MAP_LOCAL: | |
527 | type_str = "local"; | |
528 | break; | |
529 | default: | |
530 | type_str = "(unknown)"; | |
531 | } | |
532 | audit_log_format(audit_buf, | |
533 | " cipso_doi=%u cipso_type=%s res=%u", | |
534 | doi, type_str, ret_val == 0 ? 1 : 0); | |
535 | audit_log_end(audit_buf); | |
536 | } | |
446fda4f | 537 | |
6c2e8ac0 | 538 | return ret_val; |
446fda4f PM |
539 | } |
540 | ||
b1edeb10 PM |
541 | /** |
542 | * cipso_v4_doi_free - Frees a DOI definition | |
543 | * @entry: the entry's RCU field | |
544 | * | |
545 | * Description: | |
546 | * This function frees all of the memory associated with a DOI definition. | |
547 | * | |
548 | */ | |
549 | void cipso_v4_doi_free(struct cipso_v4_doi *doi_def) | |
550 | { | |
551 | if (doi_def == NULL) | |
552 | return; | |
553 | ||
554 | switch (doi_def->type) { | |
15c45f7b | 555 | case CIPSO_V4_MAP_TRANS: |
b1edeb10 PM |
556 | kfree(doi_def->map.std->lvl.cipso); |
557 | kfree(doi_def->map.std->lvl.local); | |
558 | kfree(doi_def->map.std->cat.cipso); | |
559 | kfree(doi_def->map.std->cat.local); | |
560 | break; | |
561 | } | |
562 | kfree(doi_def); | |
563 | } | |
564 | ||
565 | /** | |
566 | * cipso_v4_doi_free_rcu - Frees a DOI definition via the RCU pointer | |
567 | * @entry: the entry's RCU field | |
568 | * | |
569 | * Description: | |
570 | * This function is designed to be used as a callback to the call_rcu() | |
571 | * function so that the memory allocated to the DOI definition can be released | |
572 | * safely. | |
573 | * | |
574 | */ | |
575 | static void cipso_v4_doi_free_rcu(struct rcu_head *entry) | |
576 | { | |
577 | struct cipso_v4_doi *doi_def; | |
578 | ||
579 | doi_def = container_of(entry, struct cipso_v4_doi, rcu); | |
580 | cipso_v4_doi_free(doi_def); | |
581 | } | |
582 | ||
446fda4f PM |
583 | /** |
584 | * cipso_v4_doi_remove - Remove an existing DOI from the CIPSO protocol engine | |
585 | * @doi: the DOI value | |
32f50cde | 586 | * @audit_secid: the LSM secid to use in the audit message |
446fda4f PM |
587 | * |
588 | * Description: | |
b1edeb10 PM |
589 | * Removes a DOI definition from the CIPSO engine. The NetLabel routines will |
590 | * be called to release their own LSM domain mappings as well as our own | |
591 | * domain list. Returns zero on success and negative values on failure. | |
446fda4f PM |
592 | * |
593 | */ | |
b1edeb10 | 594 | int cipso_v4_doi_remove(u32 doi, struct netlbl_audit *audit_info) |
446fda4f | 595 | { |
6c2e8ac0 | 596 | int ret_val; |
446fda4f | 597 | struct cipso_v4_doi *doi_def; |
6c2e8ac0 | 598 | struct audit_buffer *audit_buf; |
446fda4f | 599 | |
4be2700f PM |
600 | spin_lock(&cipso_v4_doi_list_lock); |
601 | doi_def = cipso_v4_doi_search(doi); | |
b1edeb10 | 602 | if (doi_def == NULL) { |
446fda4f | 603 | spin_unlock(&cipso_v4_doi_list_lock); |
6c2e8ac0 PM |
604 | ret_val = -ENOENT; |
605 | goto doi_remove_return; | |
446fda4f | 606 | } |
b1edeb10 PM |
607 | if (!atomic_dec_and_test(&doi_def->refcount)) { |
608 | spin_unlock(&cipso_v4_doi_list_lock); | |
6c2e8ac0 PM |
609 | ret_val = -EBUSY; |
610 | goto doi_remove_return; | |
b1edeb10 PM |
611 | } |
612 | list_del_rcu(&doi_def->list); | |
4be2700f | 613 | spin_unlock(&cipso_v4_doi_list_lock); |
446fda4f | 614 | |
b1edeb10 PM |
615 | cipso_v4_cache_invalidate(); |
616 | call_rcu(&doi_def->rcu, cipso_v4_doi_free_rcu); | |
6c2e8ac0 PM |
617 | ret_val = 0; |
618 | ||
619 | doi_remove_return: | |
620 | audit_buf = netlbl_audit_start(AUDIT_MAC_CIPSOV4_DEL, audit_info); | |
621 | if (audit_buf != NULL) { | |
622 | audit_log_format(audit_buf, | |
623 | " cipso_doi=%u res=%u", | |
624 | doi, ret_val == 0 ? 1 : 0); | |
625 | audit_log_end(audit_buf); | |
626 | } | |
b1edeb10 | 627 | |
6c2e8ac0 | 628 | return ret_val; |
446fda4f PM |
629 | } |
630 | ||
631 | /** | |
b1edeb10 | 632 | * cipso_v4_doi_getdef - Returns a reference to a valid DOI definition |
446fda4f PM |
633 | * @doi: the DOI value |
634 | * | |
635 | * Description: | |
636 | * Searches for a valid DOI definition and if one is found it is returned to | |
637 | * the caller. Otherwise NULL is returned. The caller must ensure that | |
b1edeb10 PM |
638 | * rcu_read_lock() is held while accessing the returned definition and the DOI |
639 | * definition reference count is decremented when the caller is done. | |
446fda4f PM |
640 | * |
641 | */ | |
642 | struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi) | |
643 | { | |
b1edeb10 PM |
644 | struct cipso_v4_doi *doi_def; |
645 | ||
646 | rcu_read_lock(); | |
647 | doi_def = cipso_v4_doi_search(doi); | |
648 | if (doi_def == NULL) | |
649 | goto doi_getdef_return; | |
650 | if (!atomic_inc_not_zero(&doi_def->refcount)) | |
651 | doi_def = NULL; | |
652 | ||
653 | doi_getdef_return: | |
654 | rcu_read_unlock(); | |
655 | return doi_def; | |
656 | } | |
657 | ||
658 | /** | |
659 | * cipso_v4_doi_putdef - Releases a reference for the given DOI definition | |
660 | * @doi_def: the DOI definition | |
661 | * | |
662 | * Description: | |
663 | * Releases a DOI definition reference obtained from cipso_v4_doi_getdef(). | |
664 | * | |
665 | */ | |
666 | void cipso_v4_doi_putdef(struct cipso_v4_doi *doi_def) | |
667 | { | |
668 | if (doi_def == NULL) | |
669 | return; | |
670 | ||
671 | if (!atomic_dec_and_test(&doi_def->refcount)) | |
672 | return; | |
673 | spin_lock(&cipso_v4_doi_list_lock); | |
674 | list_del_rcu(&doi_def->list); | |
675 | spin_unlock(&cipso_v4_doi_list_lock); | |
676 | ||
677 | cipso_v4_cache_invalidate(); | |
678 | call_rcu(&doi_def->rcu, cipso_v4_doi_free_rcu); | |
446fda4f PM |
679 | } |
680 | ||
681 | /** | |
fcd48280 PM |
682 | * cipso_v4_doi_walk - Iterate through the DOI definitions |
683 | * @skip_cnt: skip past this number of DOI definitions, updated | |
684 | * @callback: callback for each DOI definition | |
685 | * @cb_arg: argument for the callback function | |
446fda4f PM |
686 | * |
687 | * Description: | |
fcd48280 PM |
688 | * Iterate over the DOI definition list, skipping the first @skip_cnt entries. |
689 | * For each entry call @callback, if @callback returns a negative value stop | |
690 | * 'walking' through the list and return. Updates the value in @skip_cnt upon | |
691 | * return. Returns zero on success, negative values on failure. | |
446fda4f PM |
692 | * |
693 | */ | |
fcd48280 PM |
694 | int cipso_v4_doi_walk(u32 *skip_cnt, |
695 | int (*callback) (struct cipso_v4_doi *doi_def, void *arg), | |
696 | void *cb_arg) | |
446fda4f | 697 | { |
fcd48280 | 698 | int ret_val = -ENOENT; |
446fda4f | 699 | u32 doi_cnt = 0; |
fcd48280 | 700 | struct cipso_v4_doi *iter_doi; |
446fda4f | 701 | |
446fda4f | 702 | rcu_read_lock(); |
fcd48280 | 703 | list_for_each_entry_rcu(iter_doi, &cipso_v4_doi_list, list) |
b1edeb10 | 704 | if (atomic_read(&iter_doi->refcount) > 0) { |
fcd48280 PM |
705 | if (doi_cnt++ < *skip_cnt) |
706 | continue; | |
707 | ret_val = callback(iter_doi, cb_arg); | |
708 | if (ret_val < 0) { | |
709 | doi_cnt--; | |
710 | goto doi_walk_return; | |
446fda4f | 711 | } |
446fda4f | 712 | } |
446fda4f | 713 | |
fcd48280 | 714 | doi_walk_return: |
446fda4f | 715 | rcu_read_unlock(); |
fcd48280 PM |
716 | *skip_cnt = doi_cnt; |
717 | return ret_val; | |
446fda4f PM |
718 | } |
719 | ||
446fda4f PM |
720 | /* |
721 | * Label Mapping Functions | |
722 | */ | |
723 | ||
724 | /** | |
725 | * cipso_v4_map_lvl_valid - Checks to see if the given level is understood | |
726 | * @doi_def: the DOI definition | |
727 | * @level: the level to check | |
728 | * | |
729 | * Description: | |
730 | * Checks the given level against the given DOI definition and returns a | |
731 | * negative value if the level does not have a valid mapping and a zero value | |
732 | * if the level is defined by the DOI. | |
733 | * | |
734 | */ | |
735 | static int cipso_v4_map_lvl_valid(const struct cipso_v4_doi *doi_def, u8 level) | |
736 | { | |
737 | switch (doi_def->type) { | |
738 | case CIPSO_V4_MAP_PASS: | |
739 | return 0; | |
15c45f7b | 740 | case CIPSO_V4_MAP_TRANS: |
446fda4f PM |
741 | if (doi_def->map.std->lvl.cipso[level] < CIPSO_V4_INV_LVL) |
742 | return 0; | |
743 | break; | |
744 | } | |
745 | ||
746 | return -EFAULT; | |
747 | } | |
748 | ||
749 | /** | |
750 | * cipso_v4_map_lvl_hton - Perform a level mapping from the host to the network | |
751 | * @doi_def: the DOI definition | |
752 | * @host_lvl: the host MLS level | |
753 | * @net_lvl: the network/CIPSO MLS level | |
754 | * | |
755 | * Description: | |
756 | * Perform a label mapping to translate a local MLS level to the correct | |
757 | * CIPSO level using the given DOI definition. Returns zero on success, | |
758 | * negative values otherwise. | |
759 | * | |
760 | */ | |
761 | static int cipso_v4_map_lvl_hton(const struct cipso_v4_doi *doi_def, | |
762 | u32 host_lvl, | |
763 | u32 *net_lvl) | |
764 | { | |
765 | switch (doi_def->type) { | |
766 | case CIPSO_V4_MAP_PASS: | |
767 | *net_lvl = host_lvl; | |
768 | return 0; | |
15c45f7b | 769 | case CIPSO_V4_MAP_TRANS: |
c6387a86 PM |
770 | if (host_lvl < doi_def->map.std->lvl.local_size && |
771 | doi_def->map.std->lvl.local[host_lvl] < CIPSO_V4_INV_LVL) { | |
446fda4f PM |
772 | *net_lvl = doi_def->map.std->lvl.local[host_lvl]; |
773 | return 0; | |
774 | } | |
c6387a86 | 775 | return -EPERM; |
446fda4f PM |
776 | } |
777 | ||
778 | return -EINVAL; | |
779 | } | |
780 | ||
781 | /** | |
782 | * cipso_v4_map_lvl_ntoh - Perform a level mapping from the network to the host | |
783 | * @doi_def: the DOI definition | |
784 | * @net_lvl: the network/CIPSO MLS level | |
785 | * @host_lvl: the host MLS level | |
786 | * | |
787 | * Description: | |
788 | * Perform a label mapping to translate a CIPSO level to the correct local MLS | |
789 | * level using the given DOI definition. Returns zero on success, negative | |
790 | * values otherwise. | |
791 | * | |
792 | */ | |
793 | static int cipso_v4_map_lvl_ntoh(const struct cipso_v4_doi *doi_def, | |
794 | u32 net_lvl, | |
795 | u32 *host_lvl) | |
796 | { | |
797 | struct cipso_v4_std_map_tbl *map_tbl; | |
798 | ||
799 | switch (doi_def->type) { | |
800 | case CIPSO_V4_MAP_PASS: | |
801 | *host_lvl = net_lvl; | |
802 | return 0; | |
15c45f7b | 803 | case CIPSO_V4_MAP_TRANS: |
446fda4f PM |
804 | map_tbl = doi_def->map.std; |
805 | if (net_lvl < map_tbl->lvl.cipso_size && | |
806 | map_tbl->lvl.cipso[net_lvl] < CIPSO_V4_INV_LVL) { | |
807 | *host_lvl = doi_def->map.std->lvl.cipso[net_lvl]; | |
808 | return 0; | |
809 | } | |
c6387a86 | 810 | return -EPERM; |
446fda4f PM |
811 | } |
812 | ||
813 | return -EINVAL; | |
814 | } | |
815 | ||
816 | /** | |
817 | * cipso_v4_map_cat_rbm_valid - Checks to see if the category bitmap is valid | |
818 | * @doi_def: the DOI definition | |
819 | * @bitmap: category bitmap | |
820 | * @bitmap_len: bitmap length in bytes | |
821 | * | |
822 | * Description: | |
823 | * Checks the given category bitmap against the given DOI definition and | |
824 | * returns a negative value if any of the categories in the bitmap do not have | |
825 | * a valid mapping and a zero value if all of the categories are valid. | |
826 | * | |
827 | */ | |
828 | static int cipso_v4_map_cat_rbm_valid(const struct cipso_v4_doi *doi_def, | |
829 | const unsigned char *bitmap, | |
830 | u32 bitmap_len) | |
831 | { | |
832 | int cat = -1; | |
833 | u32 bitmap_len_bits = bitmap_len * 8; | |
044a68ed PM |
834 | u32 cipso_cat_size; |
835 | u32 *cipso_array; | |
446fda4f PM |
836 | |
837 | switch (doi_def->type) { | |
838 | case CIPSO_V4_MAP_PASS: | |
839 | return 0; | |
15c45f7b | 840 | case CIPSO_V4_MAP_TRANS: |
044a68ed PM |
841 | cipso_cat_size = doi_def->map.std->cat.cipso_size; |
842 | cipso_array = doi_def->map.std->cat.cipso; | |
446fda4f PM |
843 | for (;;) { |
844 | cat = cipso_v4_bitmap_walk(bitmap, | |
845 | bitmap_len_bits, | |
846 | cat + 1, | |
847 | 1); | |
848 | if (cat < 0) | |
849 | break; | |
850 | if (cat >= cipso_cat_size || | |
851 | cipso_array[cat] >= CIPSO_V4_INV_CAT) | |
852 | return -EFAULT; | |
853 | } | |
854 | ||
855 | if (cat == -1) | |
856 | return 0; | |
857 | break; | |
858 | } | |
859 | ||
860 | return -EFAULT; | |
861 | } | |
862 | ||
863 | /** | |
864 | * cipso_v4_map_cat_rbm_hton - Perform a category mapping from host to network | |
865 | * @doi_def: the DOI definition | |
02752760 | 866 | * @secattr: the security attributes |
446fda4f PM |
867 | * @net_cat: the zero'd out category bitmap in network/CIPSO format |
868 | * @net_cat_len: the length of the CIPSO bitmap in bytes | |
869 | * | |
870 | * Description: | |
871 | * Perform a label mapping to translate a local MLS category bitmap to the | |
872 | * correct CIPSO bitmap using the given DOI definition. Returns the minimum | |
873 | * size in bytes of the network bitmap on success, negative values otherwise. | |
874 | * | |
875 | */ | |
876 | static int cipso_v4_map_cat_rbm_hton(const struct cipso_v4_doi *doi_def, | |
02752760 | 877 | const struct netlbl_lsm_secattr *secattr, |
446fda4f PM |
878 | unsigned char *net_cat, |
879 | u32 net_cat_len) | |
880 | { | |
881 | int host_spot = -1; | |
02752760 | 882 | u32 net_spot = CIPSO_V4_INV_CAT; |
446fda4f | 883 | u32 net_spot_max = 0; |
446fda4f | 884 | u32 net_clen_bits = net_cat_len * 8; |
02752760 PM |
885 | u32 host_cat_size = 0; |
886 | u32 *host_cat_array = NULL; | |
446fda4f | 887 | |
15c45f7b | 888 | if (doi_def->type == CIPSO_V4_MAP_TRANS) { |
044a68ed PM |
889 | host_cat_size = doi_def->map.std->cat.local_size; |
890 | host_cat_array = doi_def->map.std->cat.local; | |
02752760 PM |
891 | } |
892 | ||
893 | for (;;) { | |
16efd454 | 894 | host_spot = netlbl_secattr_catmap_walk(secattr->attr.mls.cat, |
02752760 PM |
895 | host_spot + 1); |
896 | if (host_spot < 0) | |
897 | break; | |
898 | ||
899 | switch (doi_def->type) { | |
900 | case CIPSO_V4_MAP_PASS: | |
901 | net_spot = host_spot; | |
902 | break; | |
15c45f7b | 903 | case CIPSO_V4_MAP_TRANS: |
446fda4f PM |
904 | if (host_spot >= host_cat_size) |
905 | return -EPERM; | |
446fda4f | 906 | net_spot = host_cat_array[host_spot]; |
9fade4bf PM |
907 | if (net_spot >= CIPSO_V4_INV_CAT) |
908 | return -EPERM; | |
02752760 | 909 | break; |
446fda4f | 910 | } |
02752760 PM |
911 | if (net_spot >= net_clen_bits) |
912 | return -ENOSPC; | |
913 | cipso_v4_bitmap_setbit(net_cat, net_spot, 1); | |
446fda4f | 914 | |
02752760 PM |
915 | if (net_spot > net_spot_max) |
916 | net_spot_max = net_spot; | |
446fda4f PM |
917 | } |
918 | ||
02752760 PM |
919 | if (++net_spot_max % 8) |
920 | return net_spot_max / 8 + 1; | |
921 | return net_spot_max / 8; | |
446fda4f PM |
922 | } |
923 | ||
924 | /** | |
925 | * cipso_v4_map_cat_rbm_ntoh - Perform a category mapping from network to host | |
926 | * @doi_def: the DOI definition | |
927 | * @net_cat: the category bitmap in network/CIPSO format | |
928 | * @net_cat_len: the length of the CIPSO bitmap in bytes | |
02752760 | 929 | * @secattr: the security attributes |
446fda4f PM |
930 | * |
931 | * Description: | |
932 | * Perform a label mapping to translate a CIPSO bitmap to the correct local | |
02752760 PM |
933 | * MLS category bitmap using the given DOI definition. Returns zero on |
934 | * success, negative values on failure. | |
446fda4f PM |
935 | * |
936 | */ | |
937 | static int cipso_v4_map_cat_rbm_ntoh(const struct cipso_v4_doi *doi_def, | |
938 | const unsigned char *net_cat, | |
939 | u32 net_cat_len, | |
02752760 | 940 | struct netlbl_lsm_secattr *secattr) |
446fda4f | 941 | { |
02752760 | 942 | int ret_val; |
446fda4f | 943 | int net_spot = -1; |
02752760 | 944 | u32 host_spot = CIPSO_V4_INV_CAT; |
446fda4f | 945 | u32 net_clen_bits = net_cat_len * 8; |
02752760 PM |
946 | u32 net_cat_size = 0; |
947 | u32 *net_cat_array = NULL; | |
446fda4f | 948 | |
15c45f7b | 949 | if (doi_def->type == CIPSO_V4_MAP_TRANS) { |
044a68ed PM |
950 | net_cat_size = doi_def->map.std->cat.cipso_size; |
951 | net_cat_array = doi_def->map.std->cat.cipso; | |
02752760 | 952 | } |
446fda4f | 953 | |
02752760 PM |
954 | for (;;) { |
955 | net_spot = cipso_v4_bitmap_walk(net_cat, | |
956 | net_clen_bits, | |
957 | net_spot + 1, | |
958 | 1); | |
959 | if (net_spot < 0) { | |
960 | if (net_spot == -2) | |
961 | return -EFAULT; | |
962 | return 0; | |
963 | } | |
964 | ||
965 | switch (doi_def->type) { | |
966 | case CIPSO_V4_MAP_PASS: | |
967 | host_spot = net_spot; | |
968 | break; | |
15c45f7b | 969 | case CIPSO_V4_MAP_TRANS: |
02752760 PM |
970 | if (net_spot >= net_cat_size) |
971 | return -EPERM; | |
446fda4f | 972 | host_spot = net_cat_array[net_spot]; |
9fade4bf PM |
973 | if (host_spot >= CIPSO_V4_INV_CAT) |
974 | return -EPERM; | |
02752760 | 975 | break; |
446fda4f | 976 | } |
16efd454 | 977 | ret_val = netlbl_secattr_catmap_setbit(secattr->attr.mls.cat, |
02752760 PM |
978 | host_spot, |
979 | GFP_ATOMIC); | |
980 | if (ret_val != 0) | |
981 | return ret_val; | |
446fda4f PM |
982 | } |
983 | ||
984 | return -EINVAL; | |
985 | } | |
986 | ||
654bbc2a PM |
987 | /** |
988 | * cipso_v4_map_cat_enum_valid - Checks to see if the categories are valid | |
989 | * @doi_def: the DOI definition | |
990 | * @enumcat: category list | |
991 | * @enumcat_len: length of the category list in bytes | |
992 | * | |
993 | * Description: | |
994 | * Checks the given categories against the given DOI definition and returns a | |
995 | * negative value if any of the categories do not have a valid mapping and a | |
996 | * zero value if all of the categories are valid. | |
997 | * | |
998 | */ | |
999 | static int cipso_v4_map_cat_enum_valid(const struct cipso_v4_doi *doi_def, | |
1000 | const unsigned char *enumcat, | |
1001 | u32 enumcat_len) | |
1002 | { | |
1003 | u16 cat; | |
1004 | int cat_prev = -1; | |
1005 | u32 iter; | |
1006 | ||
1007 | if (doi_def->type != CIPSO_V4_MAP_PASS || enumcat_len & 0x01) | |
1008 | return -EFAULT; | |
1009 | ||
1010 | for (iter = 0; iter < enumcat_len; iter += 2) { | |
d3e2ce3b | 1011 | cat = get_unaligned_be16(&enumcat[iter]); |
654bbc2a PM |
1012 | if (cat <= cat_prev) |
1013 | return -EFAULT; | |
1014 | cat_prev = cat; | |
1015 | } | |
1016 | ||
1017 | return 0; | |
1018 | } | |
1019 | ||
1020 | /** | |
1021 | * cipso_v4_map_cat_enum_hton - Perform a category mapping from host to network | |
1022 | * @doi_def: the DOI definition | |
1023 | * @secattr: the security attributes | |
1024 | * @net_cat: the zero'd out category list in network/CIPSO format | |
1025 | * @net_cat_len: the length of the CIPSO category list in bytes | |
1026 | * | |
1027 | * Description: | |
1028 | * Perform a label mapping to translate a local MLS category bitmap to the | |
1029 | * correct CIPSO category list using the given DOI definition. Returns the | |
1030 | * size in bytes of the network category bitmap on success, negative values | |
1031 | * otherwise. | |
1032 | * | |
1033 | */ | |
1034 | static int cipso_v4_map_cat_enum_hton(const struct cipso_v4_doi *doi_def, | |
1035 | const struct netlbl_lsm_secattr *secattr, | |
1036 | unsigned char *net_cat, | |
1037 | u32 net_cat_len) | |
1038 | { | |
1039 | int cat = -1; | |
1040 | u32 cat_iter = 0; | |
1041 | ||
1042 | for (;;) { | |
16efd454 PM |
1043 | cat = netlbl_secattr_catmap_walk(secattr->attr.mls.cat, |
1044 | cat + 1); | |
654bbc2a PM |
1045 | if (cat < 0) |
1046 | break; | |
1047 | if ((cat_iter + 2) > net_cat_len) | |
1048 | return -ENOSPC; | |
1049 | ||
1050 | *((__be16 *)&net_cat[cat_iter]) = htons(cat); | |
1051 | cat_iter += 2; | |
1052 | } | |
1053 | ||
1054 | return cat_iter; | |
1055 | } | |
1056 | ||
1057 | /** | |
1058 | * cipso_v4_map_cat_enum_ntoh - Perform a category mapping from network to host | |
1059 | * @doi_def: the DOI definition | |
1060 | * @net_cat: the category list in network/CIPSO format | |
1061 | * @net_cat_len: the length of the CIPSO bitmap in bytes | |
1062 | * @secattr: the security attributes | |
1063 | * | |
1064 | * Description: | |
1065 | * Perform a label mapping to translate a CIPSO category list to the correct | |
1066 | * local MLS category bitmap using the given DOI definition. Returns zero on | |
1067 | * success, negative values on failure. | |
1068 | * | |
1069 | */ | |
1070 | static int cipso_v4_map_cat_enum_ntoh(const struct cipso_v4_doi *doi_def, | |
1071 | const unsigned char *net_cat, | |
1072 | u32 net_cat_len, | |
1073 | struct netlbl_lsm_secattr *secattr) | |
1074 | { | |
1075 | int ret_val; | |
1076 | u32 iter; | |
1077 | ||
1078 | for (iter = 0; iter < net_cat_len; iter += 2) { | |
16efd454 | 1079 | ret_val = netlbl_secattr_catmap_setbit(secattr->attr.mls.cat, |
d3e2ce3b | 1080 | get_unaligned_be16(&net_cat[iter]), |
50e5d35c | 1081 | GFP_ATOMIC); |
654bbc2a PM |
1082 | if (ret_val != 0) |
1083 | return ret_val; | |
1084 | } | |
1085 | ||
1086 | return 0; | |
1087 | } | |
1088 | ||
484b3669 PM |
1089 | /** |
1090 | * cipso_v4_map_cat_rng_valid - Checks to see if the categories are valid | |
1091 | * @doi_def: the DOI definition | |
1092 | * @rngcat: category list | |
1093 | * @rngcat_len: length of the category list in bytes | |
1094 | * | |
1095 | * Description: | |
1096 | * Checks the given categories against the given DOI definition and returns a | |
1097 | * negative value if any of the categories do not have a valid mapping and a | |
1098 | * zero value if all of the categories are valid. | |
1099 | * | |
1100 | */ | |
1101 | static int cipso_v4_map_cat_rng_valid(const struct cipso_v4_doi *doi_def, | |
1102 | const unsigned char *rngcat, | |
1103 | u32 rngcat_len) | |
1104 | { | |
1105 | u16 cat_high; | |
1106 | u16 cat_low; | |
1107 | u32 cat_prev = CIPSO_V4_MAX_REM_CATS + 1; | |
1108 | u32 iter; | |
1109 | ||
1110 | if (doi_def->type != CIPSO_V4_MAP_PASS || rngcat_len & 0x01) | |
1111 | return -EFAULT; | |
1112 | ||
1113 | for (iter = 0; iter < rngcat_len; iter += 4) { | |
d3e2ce3b | 1114 | cat_high = get_unaligned_be16(&rngcat[iter]); |
484b3669 | 1115 | if ((iter + 4) <= rngcat_len) |
d3e2ce3b | 1116 | cat_low = get_unaligned_be16(&rngcat[iter + 2]); |
484b3669 PM |
1117 | else |
1118 | cat_low = 0; | |
1119 | ||
1120 | if (cat_high > cat_prev) | |
1121 | return -EFAULT; | |
1122 | ||
1123 | cat_prev = cat_low; | |
1124 | } | |
1125 | ||
1126 | return 0; | |
1127 | } | |
1128 | ||
1129 | /** | |
1130 | * cipso_v4_map_cat_rng_hton - Perform a category mapping from host to network | |
1131 | * @doi_def: the DOI definition | |
1132 | * @secattr: the security attributes | |
1133 | * @net_cat: the zero'd out category list in network/CIPSO format | |
1134 | * @net_cat_len: the length of the CIPSO category list in bytes | |
1135 | * | |
1136 | * Description: | |
1137 | * Perform a label mapping to translate a local MLS category bitmap to the | |
1138 | * correct CIPSO category list using the given DOI definition. Returns the | |
1139 | * size in bytes of the network category bitmap on success, negative values | |
1140 | * otherwise. | |
1141 | * | |
1142 | */ | |
1143 | static int cipso_v4_map_cat_rng_hton(const struct cipso_v4_doi *doi_def, | |
1144 | const struct netlbl_lsm_secattr *secattr, | |
1145 | unsigned char *net_cat, | |
1146 | u32 net_cat_len) | |
1147 | { | |
484b3669 | 1148 | int iter = -1; |
f998e8cb | 1149 | u16 array[CIPSO_V4_TAG_RNG_CAT_MAX * 2]; |
484b3669 PM |
1150 | u32 array_cnt = 0; |
1151 | u32 cat_size = 0; | |
1152 | ||
f998e8cb | 1153 | /* make sure we don't overflow the 'array[]' variable */ |
128c6b6c PM |
1154 | if (net_cat_len > |
1155 | (CIPSO_V4_OPT_LEN_MAX - CIPSO_V4_HDR_LEN - CIPSO_V4_TAG_RNG_BLEN)) | |
1156 | return -ENOSPC; | |
484b3669 PM |
1157 | |
1158 | for (;;) { | |
16efd454 PM |
1159 | iter = netlbl_secattr_catmap_walk(secattr->attr.mls.cat, |
1160 | iter + 1); | |
484b3669 PM |
1161 | if (iter < 0) |
1162 | break; | |
1163 | cat_size += (iter == 0 ? 0 : sizeof(u16)); | |
1164 | if (cat_size > net_cat_len) | |
1165 | return -ENOSPC; | |
1166 | array[array_cnt++] = iter; | |
1167 | ||
16efd454 PM |
1168 | iter = netlbl_secattr_catmap_walk_rng(secattr->attr.mls.cat, |
1169 | iter); | |
484b3669 PM |
1170 | if (iter < 0) |
1171 | return -EFAULT; | |
1172 | cat_size += sizeof(u16); | |
1173 | if (cat_size > net_cat_len) | |
1174 | return -ENOSPC; | |
1175 | array[array_cnt++] = iter; | |
1176 | } | |
1177 | ||
1178 | for (iter = 0; array_cnt > 0;) { | |
1179 | *((__be16 *)&net_cat[iter]) = htons(array[--array_cnt]); | |
1180 | iter += 2; | |
1181 | array_cnt--; | |
1182 | if (array[array_cnt] != 0) { | |
1183 | *((__be16 *)&net_cat[iter]) = htons(array[array_cnt]); | |
1184 | iter += 2; | |
1185 | } | |
1186 | } | |
1187 | ||
1188 | return cat_size; | |
1189 | } | |
1190 | ||
1191 | /** | |
1192 | * cipso_v4_map_cat_rng_ntoh - Perform a category mapping from network to host | |
1193 | * @doi_def: the DOI definition | |
1194 | * @net_cat: the category list in network/CIPSO format | |
1195 | * @net_cat_len: the length of the CIPSO bitmap in bytes | |
1196 | * @secattr: the security attributes | |
1197 | * | |
1198 | * Description: | |
1199 | * Perform a label mapping to translate a CIPSO category list to the correct | |
1200 | * local MLS category bitmap using the given DOI definition. Returns zero on | |
1201 | * success, negative values on failure. | |
1202 | * | |
1203 | */ | |
1204 | static int cipso_v4_map_cat_rng_ntoh(const struct cipso_v4_doi *doi_def, | |
1205 | const unsigned char *net_cat, | |
1206 | u32 net_cat_len, | |
1207 | struct netlbl_lsm_secattr *secattr) | |
1208 | { | |
1209 | int ret_val; | |
1210 | u32 net_iter; | |
1211 | u16 cat_low; | |
1212 | u16 cat_high; | |
1213 | ||
132adf54 | 1214 | for (net_iter = 0; net_iter < net_cat_len; net_iter += 4) { |
d3e2ce3b | 1215 | cat_high = get_unaligned_be16(&net_cat[net_iter]); |
484b3669 | 1216 | if ((net_iter + 4) <= net_cat_len) |
d3e2ce3b | 1217 | cat_low = get_unaligned_be16(&net_cat[net_iter + 2]); |
484b3669 PM |
1218 | else |
1219 | cat_low = 0; | |
1220 | ||
16efd454 | 1221 | ret_val = netlbl_secattr_catmap_setrng(secattr->attr.mls.cat, |
484b3669 PM |
1222 | cat_low, |
1223 | cat_high, | |
1224 | GFP_ATOMIC); | |
1225 | if (ret_val != 0) | |
1226 | return ret_val; | |
1227 | } | |
1228 | ||
1229 | return 0; | |
1230 | } | |
1231 | ||
446fda4f PM |
1232 | /* |
1233 | * Protocol Handling Functions | |
1234 | */ | |
1235 | ||
446fda4f PM |
1236 | /** |
1237 | * cipso_v4_gentag_hdr - Generate a CIPSO option header | |
1238 | * @doi_def: the DOI definition | |
91b1ed0a | 1239 | * @len: the total tag length in bytes, not including this header |
446fda4f PM |
1240 | * @buf: the CIPSO option buffer |
1241 | * | |
1242 | * Description: | |
91b1ed0a | 1243 | * Write a CIPSO header into the beginning of @buffer. |
446fda4f PM |
1244 | * |
1245 | */ | |
91b1ed0a PM |
1246 | static void cipso_v4_gentag_hdr(const struct cipso_v4_doi *doi_def, |
1247 | unsigned char *buf, | |
1248 | u32 len) | |
446fda4f | 1249 | { |
446fda4f PM |
1250 | buf[0] = IPOPT_CIPSO; |
1251 | buf[1] = CIPSO_V4_HDR_LEN + len; | |
714e85be | 1252 | *(__be32 *)&buf[2] = htonl(doi_def->doi); |
446fda4f PM |
1253 | } |
1254 | ||
446fda4f PM |
1255 | /** |
1256 | * cipso_v4_gentag_rbm - Generate a CIPSO restricted bitmap tag (type #1) | |
1257 | * @doi_def: the DOI definition | |
1258 | * @secattr: the security attributes | |
1259 | * @buffer: the option buffer | |
1260 | * @buffer_len: length of buffer in bytes | |
1261 | * | |
1262 | * Description: | |
1263 | * Generate a CIPSO option using the restricted bitmap tag, tag type #1. The | |
1264 | * actual buffer length may be larger than the indicated size due to | |
91b1ed0a PM |
1265 | * translation between host and network category bitmaps. Returns the size of |
1266 | * the tag on success, negative values on failure. | |
446fda4f PM |
1267 | * |
1268 | */ | |
1269 | static int cipso_v4_gentag_rbm(const struct cipso_v4_doi *doi_def, | |
1270 | const struct netlbl_lsm_secattr *secattr, | |
91b1ed0a PM |
1271 | unsigned char *buffer, |
1272 | u32 buffer_len) | |
446fda4f | 1273 | { |
701a90ba | 1274 | int ret_val; |
91b1ed0a | 1275 | u32 tag_len; |
446fda4f PM |
1276 | u32 level; |
1277 | ||
701a90ba PM |
1278 | if ((secattr->flags & NETLBL_SECATTR_MLS_LVL) == 0) |
1279 | return -EPERM; | |
1280 | ||
16efd454 PM |
1281 | ret_val = cipso_v4_map_lvl_hton(doi_def, |
1282 | secattr->attr.mls.lvl, | |
1283 | &level); | |
91b1ed0a PM |
1284 | if (ret_val != 0) |
1285 | return ret_val; | |
446fda4f | 1286 | |
91b1ed0a | 1287 | if (secattr->flags & NETLBL_SECATTR_MLS_CAT) { |
446fda4f | 1288 | ret_val = cipso_v4_map_cat_rbm_hton(doi_def, |
02752760 | 1289 | secattr, |
91b1ed0a PM |
1290 | &buffer[4], |
1291 | buffer_len - 4); | |
446fda4f | 1292 | if (ret_val < 0) |
91b1ed0a | 1293 | return ret_val; |
446fda4f PM |
1294 | |
1295 | /* This will send packets using the "optimized" format when | |
25985edc | 1296 | * possible as specified in section 3.4.2.6 of the |
446fda4f | 1297 | * CIPSO draft. */ |
701a90ba | 1298 | if (cipso_v4_rbm_optfmt && ret_val > 0 && ret_val <= 10) |
91b1ed0a | 1299 | tag_len = 14; |
701a90ba | 1300 | else |
91b1ed0a PM |
1301 | tag_len = 4 + ret_val; |
1302 | } else | |
1303 | tag_len = 4; | |
446fda4f | 1304 | |
15c45f7b | 1305 | buffer[0] = CIPSO_V4_TAG_RBITMAP; |
91b1ed0a PM |
1306 | buffer[1] = tag_len; |
1307 | buffer[3] = level; | |
446fda4f | 1308 | |
91b1ed0a | 1309 | return tag_len; |
446fda4f PM |
1310 | } |
1311 | ||
1312 | /** | |
1313 | * cipso_v4_parsetag_rbm - Parse a CIPSO restricted bitmap tag | |
1314 | * @doi_def: the DOI definition | |
1315 | * @tag: the CIPSO tag | |
1316 | * @secattr: the security attributes | |
1317 | * | |
1318 | * Description: | |
1319 | * Parse a CIPSO restricted bitmap tag (tag type #1) and return the security | |
1320 | * attributes in @secattr. Return zero on success, negatives values on | |
1321 | * failure. | |
1322 | * | |
1323 | */ | |
1324 | static int cipso_v4_parsetag_rbm(const struct cipso_v4_doi *doi_def, | |
1325 | const unsigned char *tag, | |
1326 | struct netlbl_lsm_secattr *secattr) | |
1327 | { | |
1328 | int ret_val; | |
1329 | u8 tag_len = tag[1]; | |
1330 | u32 level; | |
1331 | ||
1332 | ret_val = cipso_v4_map_lvl_ntoh(doi_def, tag[3], &level); | |
1333 | if (ret_val != 0) | |
1334 | return ret_val; | |
16efd454 | 1335 | secattr->attr.mls.lvl = level; |
701a90ba | 1336 | secattr->flags |= NETLBL_SECATTR_MLS_LVL; |
446fda4f PM |
1337 | |
1338 | if (tag_len > 4) { | |
16efd454 PM |
1339 | secattr->attr.mls.cat = |
1340 | netlbl_secattr_catmap_alloc(GFP_ATOMIC); | |
1341 | if (secattr->attr.mls.cat == NULL) | |
446fda4f PM |
1342 | return -ENOMEM; |
1343 | ||
1344 | ret_val = cipso_v4_map_cat_rbm_ntoh(doi_def, | |
1345 | &tag[4], | |
1346 | tag_len - 4, | |
02752760 PM |
1347 | secattr); |
1348 | if (ret_val != 0) { | |
16efd454 | 1349 | netlbl_secattr_catmap_free(secattr->attr.mls.cat); |
446fda4f PM |
1350 | return ret_val; |
1351 | } | |
02752760 PM |
1352 | |
1353 | secattr->flags |= NETLBL_SECATTR_MLS_CAT; | |
446fda4f PM |
1354 | } |
1355 | ||
1356 | return 0; | |
1357 | } | |
1358 | ||
654bbc2a PM |
1359 | /** |
1360 | * cipso_v4_gentag_enum - Generate a CIPSO enumerated tag (type #2) | |
1361 | * @doi_def: the DOI definition | |
1362 | * @secattr: the security attributes | |
1363 | * @buffer: the option buffer | |
1364 | * @buffer_len: length of buffer in bytes | |
1365 | * | |
1366 | * Description: | |
1367 | * Generate a CIPSO option using the enumerated tag, tag type #2. Returns the | |
1368 | * size of the tag on success, negative values on failure. | |
1369 | * | |
1370 | */ | |
1371 | static int cipso_v4_gentag_enum(const struct cipso_v4_doi *doi_def, | |
1372 | const struct netlbl_lsm_secattr *secattr, | |
1373 | unsigned char *buffer, | |
1374 | u32 buffer_len) | |
1375 | { | |
1376 | int ret_val; | |
1377 | u32 tag_len; | |
1378 | u32 level; | |
1379 | ||
1380 | if (!(secattr->flags & NETLBL_SECATTR_MLS_LVL)) | |
1381 | return -EPERM; | |
1382 | ||
16efd454 PM |
1383 | ret_val = cipso_v4_map_lvl_hton(doi_def, |
1384 | secattr->attr.mls.lvl, | |
1385 | &level); | |
654bbc2a PM |
1386 | if (ret_val != 0) |
1387 | return ret_val; | |
1388 | ||
1389 | if (secattr->flags & NETLBL_SECATTR_MLS_CAT) { | |
1390 | ret_val = cipso_v4_map_cat_enum_hton(doi_def, | |
1391 | secattr, | |
1392 | &buffer[4], | |
1393 | buffer_len - 4); | |
1394 | if (ret_val < 0) | |
1395 | return ret_val; | |
1396 | ||
1397 | tag_len = 4 + ret_val; | |
1398 | } else | |
1399 | tag_len = 4; | |
1400 | ||
15c45f7b | 1401 | buffer[0] = CIPSO_V4_TAG_ENUM; |
654bbc2a PM |
1402 | buffer[1] = tag_len; |
1403 | buffer[3] = level; | |
1404 | ||
1405 | return tag_len; | |
1406 | } | |
1407 | ||
1408 | /** | |
1409 | * cipso_v4_parsetag_enum - Parse a CIPSO enumerated tag | |
1410 | * @doi_def: the DOI definition | |
1411 | * @tag: the CIPSO tag | |
1412 | * @secattr: the security attributes | |
1413 | * | |
1414 | * Description: | |
1415 | * Parse a CIPSO enumerated tag (tag type #2) and return the security | |
1416 | * attributes in @secattr. Return zero on success, negatives values on | |
1417 | * failure. | |
1418 | * | |
1419 | */ | |
1420 | static int cipso_v4_parsetag_enum(const struct cipso_v4_doi *doi_def, | |
1421 | const unsigned char *tag, | |
1422 | struct netlbl_lsm_secattr *secattr) | |
1423 | { | |
1424 | int ret_val; | |
1425 | u8 tag_len = tag[1]; | |
1426 | u32 level; | |
1427 | ||
1428 | ret_val = cipso_v4_map_lvl_ntoh(doi_def, tag[3], &level); | |
1429 | if (ret_val != 0) | |
1430 | return ret_val; | |
16efd454 | 1431 | secattr->attr.mls.lvl = level; |
654bbc2a PM |
1432 | secattr->flags |= NETLBL_SECATTR_MLS_LVL; |
1433 | ||
1434 | if (tag_len > 4) { | |
16efd454 PM |
1435 | secattr->attr.mls.cat = |
1436 | netlbl_secattr_catmap_alloc(GFP_ATOMIC); | |
1437 | if (secattr->attr.mls.cat == NULL) | |
654bbc2a PM |
1438 | return -ENOMEM; |
1439 | ||
1440 | ret_val = cipso_v4_map_cat_enum_ntoh(doi_def, | |
1441 | &tag[4], | |
1442 | tag_len - 4, | |
1443 | secattr); | |
1444 | if (ret_val != 0) { | |
16efd454 | 1445 | netlbl_secattr_catmap_free(secattr->attr.mls.cat); |
654bbc2a PM |
1446 | return ret_val; |
1447 | } | |
1448 | ||
1449 | secattr->flags |= NETLBL_SECATTR_MLS_CAT; | |
1450 | } | |
1451 | ||
1452 | return 0; | |
1453 | } | |
1454 | ||
484b3669 PM |
1455 | /** |
1456 | * cipso_v4_gentag_rng - Generate a CIPSO ranged tag (type #5) | |
1457 | * @doi_def: the DOI definition | |
1458 | * @secattr: the security attributes | |
1459 | * @buffer: the option buffer | |
1460 | * @buffer_len: length of buffer in bytes | |
1461 | * | |
1462 | * Description: | |
1463 | * Generate a CIPSO option using the ranged tag, tag type #5. Returns the | |
1464 | * size of the tag on success, negative values on failure. | |
1465 | * | |
1466 | */ | |
1467 | static int cipso_v4_gentag_rng(const struct cipso_v4_doi *doi_def, | |
1468 | const struct netlbl_lsm_secattr *secattr, | |
1469 | unsigned char *buffer, | |
1470 | u32 buffer_len) | |
1471 | { | |
1472 | int ret_val; | |
1473 | u32 tag_len; | |
1474 | u32 level; | |
1475 | ||
1476 | if (!(secattr->flags & NETLBL_SECATTR_MLS_LVL)) | |
1477 | return -EPERM; | |
1478 | ||
16efd454 PM |
1479 | ret_val = cipso_v4_map_lvl_hton(doi_def, |
1480 | secattr->attr.mls.lvl, | |
1481 | &level); | |
484b3669 PM |
1482 | if (ret_val != 0) |
1483 | return ret_val; | |
1484 | ||
1485 | if (secattr->flags & NETLBL_SECATTR_MLS_CAT) { | |
1486 | ret_val = cipso_v4_map_cat_rng_hton(doi_def, | |
1487 | secattr, | |
1488 | &buffer[4], | |
1489 | buffer_len - 4); | |
1490 | if (ret_val < 0) | |
1491 | return ret_val; | |
1492 | ||
1493 | tag_len = 4 + ret_val; | |
1494 | } else | |
1495 | tag_len = 4; | |
1496 | ||
15c45f7b | 1497 | buffer[0] = CIPSO_V4_TAG_RANGE; |
484b3669 PM |
1498 | buffer[1] = tag_len; |
1499 | buffer[3] = level; | |
1500 | ||
1501 | return tag_len; | |
1502 | } | |
1503 | ||
1504 | /** | |
1505 | * cipso_v4_parsetag_rng - Parse a CIPSO ranged tag | |
1506 | * @doi_def: the DOI definition | |
1507 | * @tag: the CIPSO tag | |
1508 | * @secattr: the security attributes | |
1509 | * | |
1510 | * Description: | |
1511 | * Parse a CIPSO ranged tag (tag type #5) and return the security attributes | |
1512 | * in @secattr. Return zero on success, negatives values on failure. | |
1513 | * | |
1514 | */ | |
1515 | static int cipso_v4_parsetag_rng(const struct cipso_v4_doi *doi_def, | |
1516 | const unsigned char *tag, | |
1517 | struct netlbl_lsm_secattr *secattr) | |
1518 | { | |
1519 | int ret_val; | |
1520 | u8 tag_len = tag[1]; | |
1521 | u32 level; | |
1522 | ||
1523 | ret_val = cipso_v4_map_lvl_ntoh(doi_def, tag[3], &level); | |
1524 | if (ret_val != 0) | |
1525 | return ret_val; | |
16efd454 | 1526 | secattr->attr.mls.lvl = level; |
484b3669 PM |
1527 | secattr->flags |= NETLBL_SECATTR_MLS_LVL; |
1528 | ||
1529 | if (tag_len > 4) { | |
16efd454 PM |
1530 | secattr->attr.mls.cat = |
1531 | netlbl_secattr_catmap_alloc(GFP_ATOMIC); | |
1532 | if (secattr->attr.mls.cat == NULL) | |
484b3669 PM |
1533 | return -ENOMEM; |
1534 | ||
1535 | ret_val = cipso_v4_map_cat_rng_ntoh(doi_def, | |
1536 | &tag[4], | |
1537 | tag_len - 4, | |
1538 | secattr); | |
1539 | if (ret_val != 0) { | |
16efd454 | 1540 | netlbl_secattr_catmap_free(secattr->attr.mls.cat); |
484b3669 PM |
1541 | return ret_val; |
1542 | } | |
1543 | ||
1544 | secattr->flags |= NETLBL_SECATTR_MLS_CAT; | |
1545 | } | |
1546 | ||
1547 | return 0; | |
1548 | } | |
1549 | ||
15c45f7b PM |
1550 | /** |
1551 | * cipso_v4_gentag_loc - Generate a CIPSO local tag (non-standard) | |
1552 | * @doi_def: the DOI definition | |
1553 | * @secattr: the security attributes | |
1554 | * @buffer: the option buffer | |
1555 | * @buffer_len: length of buffer in bytes | |
1556 | * | |
1557 | * Description: | |
1558 | * Generate a CIPSO option using the local tag. Returns the size of the tag | |
1559 | * on success, negative values on failure. | |
1560 | * | |
1561 | */ | |
1562 | static int cipso_v4_gentag_loc(const struct cipso_v4_doi *doi_def, | |
1563 | const struct netlbl_lsm_secattr *secattr, | |
1564 | unsigned char *buffer, | |
1565 | u32 buffer_len) | |
1566 | { | |
1567 | if (!(secattr->flags & NETLBL_SECATTR_SECID)) | |
1568 | return -EPERM; | |
1569 | ||
1570 | buffer[0] = CIPSO_V4_TAG_LOCAL; | |
1571 | buffer[1] = CIPSO_V4_TAG_LOC_BLEN; | |
1572 | *(u32 *)&buffer[2] = secattr->attr.secid; | |
1573 | ||
1574 | return CIPSO_V4_TAG_LOC_BLEN; | |
1575 | } | |
1576 | ||
1577 | /** | |
1578 | * cipso_v4_parsetag_loc - Parse a CIPSO local tag | |
1579 | * @doi_def: the DOI definition | |
1580 | * @tag: the CIPSO tag | |
1581 | * @secattr: the security attributes | |
1582 | * | |
1583 | * Description: | |
1584 | * Parse a CIPSO local tag and return the security attributes in @secattr. | |
1585 | * Return zero on success, negatives values on failure. | |
1586 | * | |
1587 | */ | |
1588 | static int cipso_v4_parsetag_loc(const struct cipso_v4_doi *doi_def, | |
1589 | const unsigned char *tag, | |
1590 | struct netlbl_lsm_secattr *secattr) | |
1591 | { | |
1592 | secattr->attr.secid = *(u32 *)&tag[2]; | |
1593 | secattr->flags |= NETLBL_SECATTR_SECID; | |
1594 | ||
1595 | return 0; | |
1596 | } | |
1597 | ||
446fda4f PM |
1598 | /** |
1599 | * cipso_v4_validate - Validate a CIPSO option | |
1600 | * @option: the start of the option, on error it is set to point to the error | |
1601 | * | |
1602 | * Description: | |
1603 | * This routine is called to validate a CIPSO option, it checks all of the | |
1604 | * fields to ensure that they are at least valid, see the draft snippet below | |
1605 | * for details. If the option is valid then a zero value is returned and | |
1606 | * the value of @option is unchanged. If the option is invalid then a | |
1607 | * non-zero value is returned and @option is adjusted to point to the | |
1608 | * offending portion of the option. From the IETF draft ... | |
1609 | * | |
1610 | * "If any field within the CIPSO options, such as the DOI identifier, is not | |
1611 | * recognized the IP datagram is discarded and an ICMP 'parameter problem' | |
1612 | * (type 12) is generated and returned. The ICMP code field is set to 'bad | |
1613 | * parameter' (code 0) and the pointer is set to the start of the CIPSO field | |
1614 | * that is unrecognized." | |
1615 | * | |
1616 | */ | |
15c45f7b | 1617 | int cipso_v4_validate(const struct sk_buff *skb, unsigned char **option) |
446fda4f PM |
1618 | { |
1619 | unsigned char *opt = *option; | |
1620 | unsigned char *tag; | |
1621 | unsigned char opt_iter; | |
1622 | unsigned char err_offset = 0; | |
1623 | u8 opt_len; | |
1624 | u8 tag_len; | |
1625 | struct cipso_v4_doi *doi_def = NULL; | |
1626 | u32 tag_iter; | |
1627 | ||
1628 | /* caller already checks for length values that are too large */ | |
1629 | opt_len = opt[1]; | |
1630 | if (opt_len < 8) { | |
1631 | err_offset = 1; | |
1632 | goto validate_return; | |
1633 | } | |
1634 | ||
1635 | rcu_read_lock(); | |
d3e2ce3b | 1636 | doi_def = cipso_v4_doi_search(get_unaligned_be32(&opt[2])); |
446fda4f PM |
1637 | if (doi_def == NULL) { |
1638 | err_offset = 2; | |
1639 | goto validate_return_locked; | |
1640 | } | |
1641 | ||
15c45f7b | 1642 | opt_iter = CIPSO_V4_HDR_LEN; |
446fda4f PM |
1643 | tag = opt + opt_iter; |
1644 | while (opt_iter < opt_len) { | |
1645 | for (tag_iter = 0; doi_def->tags[tag_iter] != tag[0];) | |
1646 | if (doi_def->tags[tag_iter] == CIPSO_V4_TAG_INVALID || | |
1647 | ++tag_iter == CIPSO_V4_TAG_MAXCNT) { | |
1648 | err_offset = opt_iter; | |
1649 | goto validate_return_locked; | |
1650 | } | |
1651 | ||
1652 | tag_len = tag[1]; | |
1653 | if (tag_len > (opt_len - opt_iter)) { | |
1654 | err_offset = opt_iter + 1; | |
1655 | goto validate_return_locked; | |
1656 | } | |
1657 | ||
1658 | switch (tag[0]) { | |
1659 | case CIPSO_V4_TAG_RBITMAP: | |
15c45f7b | 1660 | if (tag_len < CIPSO_V4_TAG_RBM_BLEN) { |
446fda4f PM |
1661 | err_offset = opt_iter + 1; |
1662 | goto validate_return_locked; | |
1663 | } | |
1664 | ||
1665 | /* We are already going to do all the verification | |
1666 | * necessary at the socket layer so from our point of | |
1667 | * view it is safe to turn these checks off (and less | |
1668 | * work), however, the CIPSO draft says we should do | |
1669 | * all the CIPSO validations here but it doesn't | |
1670 | * really specify _exactly_ what we need to validate | |
1671 | * ... so, just make it a sysctl tunable. */ | |
1672 | if (cipso_v4_rbm_strictvalid) { | |
1673 | if (cipso_v4_map_lvl_valid(doi_def, | |
1674 | tag[3]) < 0) { | |
1675 | err_offset = opt_iter + 3; | |
1676 | goto validate_return_locked; | |
1677 | } | |
15c45f7b | 1678 | if (tag_len > CIPSO_V4_TAG_RBM_BLEN && |
446fda4f PM |
1679 | cipso_v4_map_cat_rbm_valid(doi_def, |
1680 | &tag[4], | |
1681 | tag_len - 4) < 0) { | |
1682 | err_offset = opt_iter + 4; | |
1683 | goto validate_return_locked; | |
1684 | } | |
1685 | } | |
1686 | break; | |
654bbc2a | 1687 | case CIPSO_V4_TAG_ENUM: |
15c45f7b | 1688 | if (tag_len < CIPSO_V4_TAG_ENUM_BLEN) { |
654bbc2a PM |
1689 | err_offset = opt_iter + 1; |
1690 | goto validate_return_locked; | |
1691 | } | |
1692 | ||
1693 | if (cipso_v4_map_lvl_valid(doi_def, | |
1694 | tag[3]) < 0) { | |
1695 | err_offset = opt_iter + 3; | |
1696 | goto validate_return_locked; | |
1697 | } | |
15c45f7b | 1698 | if (tag_len > CIPSO_V4_TAG_ENUM_BLEN && |
654bbc2a PM |
1699 | cipso_v4_map_cat_enum_valid(doi_def, |
1700 | &tag[4], | |
1701 | tag_len - 4) < 0) { | |
1702 | err_offset = opt_iter + 4; | |
1703 | goto validate_return_locked; | |
1704 | } | |
1705 | break; | |
484b3669 | 1706 | case CIPSO_V4_TAG_RANGE: |
15c45f7b | 1707 | if (tag_len < CIPSO_V4_TAG_RNG_BLEN) { |
484b3669 PM |
1708 | err_offset = opt_iter + 1; |
1709 | goto validate_return_locked; | |
1710 | } | |
1711 | ||
1712 | if (cipso_v4_map_lvl_valid(doi_def, | |
1713 | tag[3]) < 0) { | |
1714 | err_offset = opt_iter + 3; | |
1715 | goto validate_return_locked; | |
1716 | } | |
15c45f7b | 1717 | if (tag_len > CIPSO_V4_TAG_RNG_BLEN && |
484b3669 PM |
1718 | cipso_v4_map_cat_rng_valid(doi_def, |
1719 | &tag[4], | |
1720 | tag_len - 4) < 0) { | |
1721 | err_offset = opt_iter + 4; | |
1722 | goto validate_return_locked; | |
1723 | } | |
1724 | break; | |
15c45f7b PM |
1725 | case CIPSO_V4_TAG_LOCAL: |
1726 | /* This is a non-standard tag that we only allow for | |
1727 | * local connections, so if the incoming interface is | |
1728 | * not the loopback device drop the packet. */ | |
1729 | if (!(skb->dev->flags & IFF_LOOPBACK)) { | |
1730 | err_offset = opt_iter; | |
1731 | goto validate_return_locked; | |
1732 | } | |
1733 | if (tag_len != CIPSO_V4_TAG_LOC_BLEN) { | |
1734 | err_offset = opt_iter + 1; | |
1735 | goto validate_return_locked; | |
1736 | } | |
1737 | break; | |
446fda4f PM |
1738 | default: |
1739 | err_offset = opt_iter; | |
1740 | goto validate_return_locked; | |
1741 | } | |
1742 | ||
1743 | tag += tag_len; | |
1744 | opt_iter += tag_len; | |
1745 | } | |
1746 | ||
1747 | validate_return_locked: | |
1748 | rcu_read_unlock(); | |
1749 | validate_return: | |
1750 | *option = opt + err_offset; | |
1751 | return err_offset; | |
1752 | } | |
1753 | ||
1754 | /** | |
25985edc | 1755 | * cipso_v4_error - Send the correct response for a bad packet |
446fda4f PM |
1756 | * @skb: the packet |
1757 | * @error: the error code | |
1758 | * @gateway: CIPSO gateway flag | |
1759 | * | |
1760 | * Description: | |
1761 | * Based on the error code given in @error, send an ICMP error message back to | |
1762 | * the originating host. From the IETF draft ... | |
1763 | * | |
1764 | * "If the contents of the CIPSO [option] are valid but the security label is | |
1765 | * outside of the configured host or port label range, the datagram is | |
1766 | * discarded and an ICMP 'destination unreachable' (type 3) is generated and | |
1767 | * returned. The code field of the ICMP is set to 'communication with | |
1768 | * destination network administratively prohibited' (code 9) or to | |
1769 | * 'communication with destination host administratively prohibited' | |
1770 | * (code 10). The value of the code is dependent on whether the originator | |
1771 | * of the ICMP message is acting as a CIPSO host or a CIPSO gateway. The | |
1772 | * recipient of the ICMP message MUST be able to handle either value. The | |
1773 | * same procedure is performed if a CIPSO [option] can not be added to an | |
1774 | * IP packet because it is too large to fit in the IP options area." | |
1775 | * | |
1776 | * "If the error is triggered by receipt of an ICMP message, the message is | |
1777 | * discarded and no response is permitted (consistent with general ICMP | |
1778 | * processing rules)." | |
1779 | * | |
1780 | */ | |
1781 | void cipso_v4_error(struct sk_buff *skb, int error, u32 gateway) | |
1782 | { | |
eddc9ec5 | 1783 | if (ip_hdr(skb)->protocol == IPPROTO_ICMP || error != -EACCES) |
446fda4f PM |
1784 | return; |
1785 | ||
1786 | if (gateway) | |
1787 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_NET_ANO, 0); | |
1788 | else | |
1789 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_ANO, 0); | |
1790 | } | |
1791 | ||
1792 | /** | |
948bf85c PM |
1793 | * cipso_v4_genopt - Generate a CIPSO option |
1794 | * @buf: the option buffer | |
1795 | * @buf_len: the size of opt_buf | |
446fda4f | 1796 | * @doi_def: the CIPSO DOI to use |
948bf85c | 1797 | * @secattr: the security attributes |
446fda4f PM |
1798 | * |
1799 | * Description: | |
948bf85c PM |
1800 | * Generate a CIPSO option using the DOI definition and security attributes |
1801 | * passed to the function. Returns the length of the option on success and | |
1802 | * negative values on failure. | |
446fda4f PM |
1803 | * |
1804 | */ | |
948bf85c PM |
1805 | static int cipso_v4_genopt(unsigned char *buf, u32 buf_len, |
1806 | const struct cipso_v4_doi *doi_def, | |
1807 | const struct netlbl_lsm_secattr *secattr) | |
446fda4f | 1808 | { |
948bf85c | 1809 | int ret_val; |
446fda4f | 1810 | u32 iter; |
446fda4f | 1811 | |
948bf85c PM |
1812 | if (buf_len <= CIPSO_V4_HDR_LEN) |
1813 | return -ENOSPC; | |
91b1ed0a | 1814 | |
446fda4f PM |
1815 | /* XXX - This code assumes only one tag per CIPSO option which isn't |
1816 | * really a good assumption to make but since we only support the MAC | |
1817 | * tags right now it is a safe assumption. */ | |
1818 | iter = 0; | |
1819 | do { | |
91b1ed0a | 1820 | memset(buf, 0, buf_len); |
446fda4f PM |
1821 | switch (doi_def->tags[iter]) { |
1822 | case CIPSO_V4_TAG_RBITMAP: | |
1823 | ret_val = cipso_v4_gentag_rbm(doi_def, | |
91b1ed0a PM |
1824 | secattr, |
1825 | &buf[CIPSO_V4_HDR_LEN], | |
1826 | buf_len - CIPSO_V4_HDR_LEN); | |
446fda4f | 1827 | break; |
654bbc2a PM |
1828 | case CIPSO_V4_TAG_ENUM: |
1829 | ret_val = cipso_v4_gentag_enum(doi_def, | |
1830 | secattr, | |
1831 | &buf[CIPSO_V4_HDR_LEN], | |
1832 | buf_len - CIPSO_V4_HDR_LEN); | |
1833 | break; | |
484b3669 PM |
1834 | case CIPSO_V4_TAG_RANGE: |
1835 | ret_val = cipso_v4_gentag_rng(doi_def, | |
1836 | secattr, | |
1837 | &buf[CIPSO_V4_HDR_LEN], | |
1838 | buf_len - CIPSO_V4_HDR_LEN); | |
1839 | break; | |
15c45f7b PM |
1840 | case CIPSO_V4_TAG_LOCAL: |
1841 | ret_val = cipso_v4_gentag_loc(doi_def, | |
1842 | secattr, | |
1843 | &buf[CIPSO_V4_HDR_LEN], | |
1844 | buf_len - CIPSO_V4_HDR_LEN); | |
1845 | break; | |
446fda4f | 1846 | default: |
948bf85c | 1847 | return -EPERM; |
446fda4f PM |
1848 | } |
1849 | ||
1850 | iter++; | |
91b1ed0a | 1851 | } while (ret_val < 0 && |
446fda4f PM |
1852 | iter < CIPSO_V4_TAG_MAXCNT && |
1853 | doi_def->tags[iter] != CIPSO_V4_TAG_INVALID); | |
91b1ed0a | 1854 | if (ret_val < 0) |
948bf85c | 1855 | return ret_val; |
91b1ed0a | 1856 | cipso_v4_gentag_hdr(doi_def, buf, ret_val); |
948bf85c PM |
1857 | return CIPSO_V4_HDR_LEN + ret_val; |
1858 | } | |
1859 | ||
1860 | /** | |
1861 | * cipso_v4_sock_setattr - Add a CIPSO option to a socket | |
1862 | * @sk: the socket | |
1863 | * @doi_def: the CIPSO DOI to use | |
1864 | * @secattr: the specific security attributes of the socket | |
1865 | * | |
1866 | * Description: | |
1867 | * Set the CIPSO option on the given socket using the DOI definition and | |
1868 | * security attributes passed to the function. This function requires | |
1869 | * exclusive access to @sk, which means it either needs to be in the | |
1870 | * process of being created or locked. Returns zero on success and negative | |
1871 | * values on failure. | |
1872 | * | |
1873 | */ | |
1874 | int cipso_v4_sock_setattr(struct sock *sk, | |
1875 | const struct cipso_v4_doi *doi_def, | |
1876 | const struct netlbl_lsm_secattr *secattr) | |
1877 | { | |
1878 | int ret_val = -EPERM; | |
1879 | unsigned char *buf = NULL; | |
1880 | u32 buf_len; | |
1881 | u32 opt_len; | |
1882 | struct ip_options *opt = NULL; | |
1883 | struct inet_sock *sk_inet; | |
1884 | struct inet_connection_sock *sk_conn; | |
1885 | ||
1886 | /* In the case of sock_create_lite(), the sock->sk field is not | |
1887 | * defined yet but it is not a problem as the only users of these | |
1888 | * "lite" PF_INET sockets are functions which do an accept() call | |
1889 | * afterwards so we will label the socket as part of the accept(). */ | |
1890 | if (sk == NULL) | |
1891 | return 0; | |
1892 | ||
1893 | /* We allocate the maximum CIPSO option size here so we are probably | |
1894 | * being a little wasteful, but it makes our life _much_ easier later | |
1895 | * on and after all we are only talking about 40 bytes. */ | |
1896 | buf_len = CIPSO_V4_OPT_LEN_MAX; | |
1897 | buf = kmalloc(buf_len, GFP_ATOMIC); | |
1898 | if (buf == NULL) { | |
1899 | ret_val = -ENOMEM; | |
1900 | goto socket_setattr_failure; | |
1901 | } | |
1902 | ||
1903 | ret_val = cipso_v4_genopt(buf, buf_len, doi_def, secattr); | |
1904 | if (ret_val < 0) | |
1905 | goto socket_setattr_failure; | |
1906 | buf_len = ret_val; | |
446fda4f PM |
1907 | |
1908 | /* We can't use ip_options_get() directly because it makes a call to | |
1909 | * ip_options_get_alloc() which allocates memory with GFP_KERNEL and | |
f8687afe PM |
1910 | * we won't always have CAP_NET_RAW even though we _always_ want to |
1911 | * set the IPOPT_CIPSO option. */ | |
446fda4f PM |
1912 | opt_len = (buf_len + 3) & ~3; |
1913 | opt = kzalloc(sizeof(*opt) + opt_len, GFP_ATOMIC); | |
1914 | if (opt == NULL) { | |
1915 | ret_val = -ENOMEM; | |
1916 | goto socket_setattr_failure; | |
1917 | } | |
1918 | memcpy(opt->__data, buf, buf_len); | |
1919 | opt->optlen = opt_len; | |
f8687afe | 1920 | opt->cipso = sizeof(struct iphdr); |
446fda4f PM |
1921 | kfree(buf); |
1922 | buf = NULL; | |
446fda4f PM |
1923 | |
1924 | sk_inet = inet_sk(sk); | |
1925 | if (sk_inet->is_icsk) { | |
1926 | sk_conn = inet_csk(sk); | |
1927 | if (sk_inet->opt) | |
1928 | sk_conn->icsk_ext_hdr_len -= sk_inet->opt->optlen; | |
1929 | sk_conn->icsk_ext_hdr_len += opt->optlen; | |
1930 | sk_conn->icsk_sync_mss(sk, sk_conn->icsk_pmtu_cookie); | |
1931 | } | |
1932 | opt = xchg(&sk_inet->opt, opt); | |
1933 | kfree(opt); | |
1934 | ||
1935 | return 0; | |
1936 | ||
1937 | socket_setattr_failure: | |
1938 | kfree(buf); | |
1939 | kfree(opt); | |
1940 | return ret_val; | |
1941 | } | |
1942 | ||
014ab19a | 1943 | /** |
389fb800 PM |
1944 | * cipso_v4_req_setattr - Add a CIPSO option to a connection request socket |
1945 | * @req: the connection request socket | |
1946 | * @doi_def: the CIPSO DOI to use | |
1947 | * @secattr: the specific security attributes of the socket | |
014ab19a PM |
1948 | * |
1949 | * Description: | |
389fb800 PM |
1950 | * Set the CIPSO option on the given socket using the DOI definition and |
1951 | * security attributes passed to the function. Returns zero on success and | |
1952 | * negative values on failure. | |
014ab19a PM |
1953 | * |
1954 | */ | |
389fb800 PM |
1955 | int cipso_v4_req_setattr(struct request_sock *req, |
1956 | const struct cipso_v4_doi *doi_def, | |
1957 | const struct netlbl_lsm_secattr *secattr) | |
014ab19a | 1958 | { |
389fb800 PM |
1959 | int ret_val = -EPERM; |
1960 | unsigned char *buf = NULL; | |
1961 | u32 buf_len; | |
1962 | u32 opt_len; | |
1963 | struct ip_options *opt = NULL; | |
1964 | struct inet_request_sock *req_inet; | |
014ab19a | 1965 | |
389fb800 PM |
1966 | /* We allocate the maximum CIPSO option size here so we are probably |
1967 | * being a little wasteful, but it makes our life _much_ easier later | |
1968 | * on and after all we are only talking about 40 bytes. */ | |
1969 | buf_len = CIPSO_V4_OPT_LEN_MAX; | |
1970 | buf = kmalloc(buf_len, GFP_ATOMIC); | |
1971 | if (buf == NULL) { | |
1972 | ret_val = -ENOMEM; | |
1973 | goto req_setattr_failure; | |
1974 | } | |
1975 | ||
1976 | ret_val = cipso_v4_genopt(buf, buf_len, doi_def, secattr); | |
1977 | if (ret_val < 0) | |
1978 | goto req_setattr_failure; | |
1979 | buf_len = ret_val; | |
1980 | ||
1981 | /* We can't use ip_options_get() directly because it makes a call to | |
1982 | * ip_options_get_alloc() which allocates memory with GFP_KERNEL and | |
1983 | * we won't always have CAP_NET_RAW even though we _always_ want to | |
1984 | * set the IPOPT_CIPSO option. */ | |
1985 | opt_len = (buf_len + 3) & ~3; | |
1986 | opt = kzalloc(sizeof(*opt) + opt_len, GFP_ATOMIC); | |
1987 | if (opt == NULL) { | |
1988 | ret_val = -ENOMEM; | |
1989 | goto req_setattr_failure; | |
1990 | } | |
1991 | memcpy(opt->__data, buf, buf_len); | |
1992 | opt->optlen = opt_len; | |
1993 | opt->cipso = sizeof(struct iphdr); | |
1994 | kfree(buf); | |
1995 | buf = NULL; | |
1996 | ||
1997 | req_inet = inet_rsk(req); | |
1998 | opt = xchg(&req_inet->opt, opt); | |
1999 | kfree(opt); | |
2000 | ||
2001 | return 0; | |
2002 | ||
2003 | req_setattr_failure: | |
2004 | kfree(buf); | |
2005 | kfree(opt); | |
2006 | return ret_val; | |
2007 | } | |
2008 | ||
2009 | /** | |
2010 | * cipso_v4_delopt - Delete the CIPSO option from a set of IP options | |
2011 | * @opt_ptr: IP option pointer | |
2012 | * | |
2013 | * Description: | |
2014 | * Deletes the CIPSO IP option from a set of IP options and makes the necessary | |
2015 | * adjustments to the IP option structure. Returns zero on success, negative | |
2016 | * values on failure. | |
2017 | * | |
2018 | */ | |
4b17d50f | 2019 | static int cipso_v4_delopt(struct ip_options **opt_ptr) |
389fb800 PM |
2020 | { |
2021 | int hdr_delta = 0; | |
2022 | struct ip_options *opt = *opt_ptr; | |
014ab19a PM |
2023 | |
2024 | if (opt->srr || opt->rr || opt->ts || opt->router_alert) { | |
2025 | u8 cipso_len; | |
2026 | u8 cipso_off; | |
2027 | unsigned char *cipso_ptr; | |
2028 | int iter; | |
2029 | int optlen_new; | |
2030 | ||
2031 | cipso_off = opt->cipso - sizeof(struct iphdr); | |
2032 | cipso_ptr = &opt->__data[cipso_off]; | |
2033 | cipso_len = cipso_ptr[1]; | |
2034 | ||
2035 | if (opt->srr > opt->cipso) | |
2036 | opt->srr -= cipso_len; | |
2037 | if (opt->rr > opt->cipso) | |
2038 | opt->rr -= cipso_len; | |
2039 | if (opt->ts > opt->cipso) | |
2040 | opt->ts -= cipso_len; | |
2041 | if (opt->router_alert > opt->cipso) | |
2042 | opt->router_alert -= cipso_len; | |
2043 | opt->cipso = 0; | |
2044 | ||
2045 | memmove(cipso_ptr, cipso_ptr + cipso_len, | |
2046 | opt->optlen - cipso_off - cipso_len); | |
2047 | ||
2048 | /* determining the new total option length is tricky because of | |
2049 | * the padding necessary, the only thing i can think to do at | |
2050 | * this point is walk the options one-by-one, skipping the | |
2051 | * padding at the end to determine the actual option size and | |
2052 | * from there we can determine the new total option length */ | |
2053 | iter = 0; | |
2054 | optlen_new = 0; | |
2055 | while (iter < opt->optlen) | |
2056 | if (opt->__data[iter] != IPOPT_NOP) { | |
2057 | iter += opt->__data[iter + 1]; | |
2058 | optlen_new = iter; | |
2059 | } else | |
2060 | iter++; | |
2061 | hdr_delta = opt->optlen; | |
2062 | opt->optlen = (optlen_new + 3) & ~3; | |
2063 | hdr_delta -= opt->optlen; | |
2064 | } else { | |
2065 | /* only the cipso option was present on the socket so we can | |
2066 | * remove the entire option struct */ | |
389fb800 | 2067 | *opt_ptr = NULL; |
014ab19a PM |
2068 | hdr_delta = opt->optlen; |
2069 | kfree(opt); | |
2070 | } | |
2071 | ||
389fb800 PM |
2072 | return hdr_delta; |
2073 | } | |
2074 | ||
2075 | /** | |
2076 | * cipso_v4_sock_delattr - Delete the CIPSO option from a socket | |
2077 | * @sk: the socket | |
2078 | * | |
2079 | * Description: | |
2080 | * Removes the CIPSO option from a socket, if present. | |
2081 | * | |
2082 | */ | |
2083 | void cipso_v4_sock_delattr(struct sock *sk) | |
2084 | { | |
2085 | int hdr_delta; | |
2086 | struct ip_options *opt; | |
2087 | struct inet_sock *sk_inet; | |
2088 | ||
2089 | sk_inet = inet_sk(sk); | |
2090 | opt = sk_inet->opt; | |
2091 | if (opt == NULL || opt->cipso == 0) | |
2092 | return; | |
2093 | ||
2094 | hdr_delta = cipso_v4_delopt(&sk_inet->opt); | |
014ab19a PM |
2095 | if (sk_inet->is_icsk && hdr_delta > 0) { |
2096 | struct inet_connection_sock *sk_conn = inet_csk(sk); | |
2097 | sk_conn->icsk_ext_hdr_len -= hdr_delta; | |
2098 | sk_conn->icsk_sync_mss(sk, sk_conn->icsk_pmtu_cookie); | |
2099 | } | |
2100 | } | |
2101 | ||
389fb800 PM |
2102 | /** |
2103 | * cipso_v4_req_delattr - Delete the CIPSO option from a request socket | |
2104 | * @reg: the request socket | |
2105 | * | |
2106 | * Description: | |
2107 | * Removes the CIPSO option from a request socket, if present. | |
2108 | * | |
2109 | */ | |
2110 | void cipso_v4_req_delattr(struct request_sock *req) | |
2111 | { | |
2112 | struct ip_options *opt; | |
2113 | struct inet_request_sock *req_inet; | |
2114 | ||
2115 | req_inet = inet_rsk(req); | |
2116 | opt = req_inet->opt; | |
2117 | if (opt == NULL || opt->cipso == 0) | |
2118 | return; | |
2119 | ||
2120 | cipso_v4_delopt(&req_inet->opt); | |
2121 | } | |
2122 | ||
446fda4f | 2123 | /** |
63d804ea PM |
2124 | * cipso_v4_getattr - Helper function for the cipso_v4_*_getattr functions |
2125 | * @cipso: the CIPSO v4 option | |
446fda4f PM |
2126 | * @secattr: the security attributes |
2127 | * | |
2128 | * Description: | |
63d804ea PM |
2129 | * Inspect @cipso and return the security attributes in @secattr. Returns zero |
2130 | * on success and negative values on failure. | |
446fda4f PM |
2131 | * |
2132 | */ | |
63d804ea PM |
2133 | static int cipso_v4_getattr(const unsigned char *cipso, |
2134 | struct netlbl_lsm_secattr *secattr) | |
446fda4f PM |
2135 | { |
2136 | int ret_val = -ENOMSG; | |
446fda4f PM |
2137 | u32 doi; |
2138 | struct cipso_v4_doi *doi_def; | |
2139 | ||
63d804ea PM |
2140 | if (cipso_v4_cache_check(cipso, cipso[1], secattr) == 0) |
2141 | return 0; | |
446fda4f | 2142 | |
d3e2ce3b | 2143 | doi = get_unaligned_be32(&cipso[2]); |
446fda4f | 2144 | rcu_read_lock(); |
9bb5fd2b | 2145 | doi_def = cipso_v4_doi_search(doi); |
63d804ea PM |
2146 | if (doi_def == NULL) |
2147 | goto getattr_return; | |
91b1ed0a PM |
2148 | /* XXX - This code assumes only one tag per CIPSO option which isn't |
2149 | * really a good assumption to make but since we only support the MAC | |
2150 | * tags right now it is a safe assumption. */ | |
63d804ea | 2151 | switch (cipso[6]) { |
446fda4f | 2152 | case CIPSO_V4_TAG_RBITMAP: |
63d804ea | 2153 | ret_val = cipso_v4_parsetag_rbm(doi_def, &cipso[6], secattr); |
446fda4f | 2154 | break; |
654bbc2a | 2155 | case CIPSO_V4_TAG_ENUM: |
63d804ea | 2156 | ret_val = cipso_v4_parsetag_enum(doi_def, &cipso[6], secattr); |
654bbc2a | 2157 | break; |
484b3669 | 2158 | case CIPSO_V4_TAG_RANGE: |
63d804ea | 2159 | ret_val = cipso_v4_parsetag_rng(doi_def, &cipso[6], secattr); |
484b3669 | 2160 | break; |
15c45f7b PM |
2161 | case CIPSO_V4_TAG_LOCAL: |
2162 | ret_val = cipso_v4_parsetag_loc(doi_def, &cipso[6], secattr); | |
2163 | break; | |
446fda4f | 2164 | } |
16efd454 PM |
2165 | if (ret_val == 0) |
2166 | secattr->type = NETLBL_NLTYPE_CIPSOV4; | |
446fda4f | 2167 | |
63d804ea PM |
2168 | getattr_return: |
2169 | rcu_read_unlock(); | |
14a72f53 PM |
2170 | return ret_val; |
2171 | } | |
2172 | ||
63d804ea PM |
2173 | /** |
2174 | * cipso_v4_sock_getattr - Get the security attributes from a sock | |
2175 | * @sk: the sock | |
2176 | * @secattr: the security attributes | |
2177 | * | |
2178 | * Description: | |
2179 | * Query @sk to see if there is a CIPSO option attached to the sock and if | |
2180 | * there is return the CIPSO security attributes in @secattr. This function | |
2181 | * requires that @sk be locked, or privately held, but it does not do any | |
2182 | * locking itself. Returns zero on success and negative values on failure. | |
2183 | * | |
2184 | */ | |
2185 | int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr) | |
2186 | { | |
2187 | struct ip_options *opt; | |
2188 | ||
2189 | opt = inet_sk(sk)->opt; | |
2190 | if (opt == NULL || opt->cipso == 0) | |
2191 | return -ENOMSG; | |
2192 | ||
2193 | return cipso_v4_getattr(opt->__data + opt->cipso - sizeof(struct iphdr), | |
2194 | secattr); | |
2195 | } | |
2196 | ||
948bf85c PM |
2197 | /** |
2198 | * cipso_v4_skbuff_setattr - Set the CIPSO option on a packet | |
2199 | * @skb: the packet | |
2200 | * @secattr: the security attributes | |
2201 | * | |
2202 | * Description: | |
2203 | * Set the CIPSO option on the given packet based on the security attributes. | |
2204 | * Returns a pointer to the IP header on success and NULL on failure. | |
2205 | * | |
2206 | */ | |
2207 | int cipso_v4_skbuff_setattr(struct sk_buff *skb, | |
2208 | const struct cipso_v4_doi *doi_def, | |
2209 | const struct netlbl_lsm_secattr *secattr) | |
2210 | { | |
2211 | int ret_val; | |
2212 | struct iphdr *iph; | |
2213 | struct ip_options *opt = &IPCB(skb)->opt; | |
2214 | unsigned char buf[CIPSO_V4_OPT_LEN_MAX]; | |
2215 | u32 buf_len = CIPSO_V4_OPT_LEN_MAX; | |
2216 | u32 opt_len; | |
2217 | int len_delta; | |
2218 | ||
00af5c69 | 2219 | ret_val = cipso_v4_genopt(buf, buf_len, doi_def, secattr); |
2220 | if (ret_val < 0) | |
2221 | return ret_val; | |
2222 | buf_len = ret_val; | |
948bf85c PM |
2223 | opt_len = (buf_len + 3) & ~3; |
2224 | ||
2225 | /* we overwrite any existing options to ensure that we have enough | |
2226 | * room for the CIPSO option, the reason is that we _need_ to guarantee | |
2227 | * that the security label is applied to the packet - we do the same | |
2228 | * thing when using the socket options and it hasn't caused a problem, | |
2229 | * if we need to we can always revisit this choice later */ | |
2230 | ||
2231 | len_delta = opt_len - opt->optlen; | |
2232 | /* if we don't ensure enough headroom we could panic on the skb_push() | |
2233 | * call below so make sure we have enough, we are also "mangling" the | |
2234 | * packet so we should probably do a copy-on-write call anyway */ | |
2235 | ret_val = skb_cow(skb, skb_headroom(skb) + len_delta); | |
2236 | if (ret_val < 0) | |
2237 | return ret_val; | |
2238 | ||
2239 | if (len_delta > 0) { | |
2240 | /* we assume that the header + opt->optlen have already been | |
2241 | * "pushed" in ip_options_build() or similar */ | |
2242 | iph = ip_hdr(skb); | |
2243 | skb_push(skb, len_delta); | |
2244 | memmove((char *)iph - len_delta, iph, iph->ihl << 2); | |
2245 | skb_reset_network_header(skb); | |
2246 | iph = ip_hdr(skb); | |
2247 | } else if (len_delta < 0) { | |
2248 | iph = ip_hdr(skb); | |
2249 | memset(iph + 1, IPOPT_NOP, opt->optlen); | |
2250 | } else | |
2251 | iph = ip_hdr(skb); | |
2252 | ||
2253 | if (opt->optlen > 0) | |
2254 | memset(opt, 0, sizeof(*opt)); | |
2255 | opt->optlen = opt_len; | |
2256 | opt->cipso = sizeof(struct iphdr); | |
2257 | opt->is_changed = 1; | |
2258 | ||
2259 | /* we have to do the following because we are being called from a | |
2260 | * netfilter hook which means the packet already has had the header | |
2261 | * fields populated and the checksum calculated - yes this means we | |
2262 | * are doing more work than needed but we do it to keep the core | |
2263 | * stack clean and tidy */ | |
2264 | memcpy(iph + 1, buf, buf_len); | |
2265 | if (opt_len > buf_len) | |
2266 | memset((char *)(iph + 1) + buf_len, 0, opt_len - buf_len); | |
2267 | if (len_delta != 0) { | |
2268 | iph->ihl = 5 + (opt_len >> 2); | |
2269 | iph->tot_len = htons(skb->len); | |
2270 | } | |
2271 | ip_send_check(iph); | |
2272 | ||
2273 | return 0; | |
2274 | } | |
2275 | ||
2276 | /** | |
2277 | * cipso_v4_skbuff_delattr - Delete any CIPSO options from a packet | |
2278 | * @skb: the packet | |
2279 | * | |
2280 | * Description: | |
2281 | * Removes any and all CIPSO options from the given packet. Returns zero on | |
2282 | * success, negative values on failure. | |
2283 | * | |
2284 | */ | |
2285 | int cipso_v4_skbuff_delattr(struct sk_buff *skb) | |
2286 | { | |
2287 | int ret_val; | |
2288 | struct iphdr *iph; | |
2289 | struct ip_options *opt = &IPCB(skb)->opt; | |
2290 | unsigned char *cipso_ptr; | |
2291 | ||
2292 | if (opt->cipso == 0) | |
2293 | return 0; | |
2294 | ||
2295 | /* since we are changing the packet we should make a copy */ | |
2296 | ret_val = skb_cow(skb, skb_headroom(skb)); | |
2297 | if (ret_val < 0) | |
2298 | return ret_val; | |
2299 | ||
2300 | /* the easiest thing to do is just replace the cipso option with noop | |
2301 | * options since we don't change the size of the packet, although we | |
2302 | * still need to recalculate the checksum */ | |
2303 | ||
2304 | iph = ip_hdr(skb); | |
2305 | cipso_ptr = (unsigned char *)iph + opt->cipso; | |
2306 | memset(cipso_ptr, IPOPT_NOOP, cipso_ptr[1]); | |
2307 | opt->cipso = 0; | |
2308 | opt->is_changed = 1; | |
2309 | ||
2310 | ip_send_check(iph); | |
2311 | ||
2312 | return 0; | |
2313 | } | |
2314 | ||
446fda4f PM |
2315 | /** |
2316 | * cipso_v4_skbuff_getattr - Get the security attributes from the CIPSO option | |
2317 | * @skb: the packet | |
2318 | * @secattr: the security attributes | |
2319 | * | |
2320 | * Description: | |
2321 | * Parse the given packet's CIPSO option and return the security attributes. | |
2322 | * Returns zero on success and negative values on failure. | |
2323 | * | |
2324 | */ | |
2325 | int cipso_v4_skbuff_getattr(const struct sk_buff *skb, | |
2326 | struct netlbl_lsm_secattr *secattr) | |
2327 | { | |
63d804ea | 2328 | return cipso_v4_getattr(CIPSO_V4_OPTPTR(skb), secattr); |
446fda4f PM |
2329 | } |
2330 | ||
2331 | /* | |
2332 | * Setup Functions | |
2333 | */ | |
2334 | ||
2335 | /** | |
2336 | * cipso_v4_init - Initialize the CIPSO module | |
2337 | * | |
2338 | * Description: | |
2339 | * Initialize the CIPSO module and prepare it for use. Returns zero on success | |
2340 | * and negative values on failure. | |
2341 | * | |
2342 | */ | |
2343 | static int __init cipso_v4_init(void) | |
2344 | { | |
2345 | int ret_val; | |
2346 | ||
2347 | ret_val = cipso_v4_cache_init(); | |
2348 | if (ret_val != 0) | |
2349 | panic("Failed to initialize the CIPSO/IPv4 cache (%d)\n", | |
2350 | ret_val); | |
2351 | ||
2352 | return 0; | |
2353 | } | |
2354 | ||
2355 | subsys_initcall(cipso_v4_init); |