Commit | Line | Data |
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1ccea77e | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
446fda4f PM |
2 | /* |
3 | * CIPSO - Commercial IP Security Option | |
4 | * | |
5 | * This is an implementation of the CIPSO 2.2 protocol as specified in | |
6 | * draft-ietf-cipso-ipsecurity-01.txt with additional tag types as found in | |
586c2500 | 7 | * FIPS-188. While CIPSO never became a full IETF RFC standard many vendors |
446fda4f PM |
8 | * have chosen to adopt the protocol and over the years it has become a |
9 | * de-facto standard for labeled networking. | |
10 | * | |
586c2500 PM |
11 | * The CIPSO draft specification can be found in the kernel's Documentation |
12 | * directory as well as the following URL: | |
7a6498eb | 13 | * https://tools.ietf.org/id/draft-ietf-cipso-ipsecurity-01.txt |
586c2500 | 14 | * The FIPS-188 specification can be found at the following URL: |
7a6498eb | 15 | * https://www.itl.nist.gov/fipspubs/fip188.htm |
586c2500 | 16 | * |
446fda4f | 17 | * Author: Paul Moore <paul.moore@hp.com> |
446fda4f PM |
18 | */ |
19 | ||
20 | /* | |
948bf85c | 21 | * (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008 |
446fda4f PM |
22 | */ |
23 | ||
24 | #include <linux/init.h> | |
25 | #include <linux/types.h> | |
26 | #include <linux/rcupdate.h> | |
27 | #include <linux/list.h> | |
28 | #include <linux/spinlock.h> | |
29 | #include <linux/string.h> | |
30 | #include <linux/jhash.h> | |
6c2e8ac0 | 31 | #include <linux/audit.h> |
5a0e3ad6 | 32 | #include <linux/slab.h> |
446fda4f PM |
33 | #include <net/ip.h> |
34 | #include <net/icmp.h> | |
35 | #include <net/tcp.h> | |
36 | #include <net/netlabel.h> | |
37 | #include <net/cipso_ipv4.h> | |
60063497 | 38 | #include <linux/atomic.h> |
4c787b16 | 39 | #include <linux/bug.h> |
50e5d35c | 40 | #include <asm/unaligned.h> |
446fda4f | 41 | |
446fda4f | 42 | /* List of available DOI definitions */ |
446fda4f PM |
43 | /* XXX - This currently assumes a minimal number of different DOIs in use, |
44 | * if in practice there are a lot of different DOIs this list should | |
45 | * probably be turned into a hash table or something similar so we | |
46 | * can do quick lookups. */ | |
8ce11e6a | 47 | static DEFINE_SPINLOCK(cipso_v4_doi_list_lock); |
1596c97a | 48 | static LIST_HEAD(cipso_v4_doi_list); |
446fda4f PM |
49 | |
50 | /* Label mapping cache */ | |
51 | int cipso_v4_cache_enabled = 1; | |
52 | int cipso_v4_cache_bucketsize = 10; | |
53 | #define CIPSO_V4_CACHE_BUCKETBITS 7 | |
54 | #define CIPSO_V4_CACHE_BUCKETS (1 << CIPSO_V4_CACHE_BUCKETBITS) | |
55 | #define CIPSO_V4_CACHE_REORDERLIMIT 10 | |
56 | struct cipso_v4_map_cache_bkt { | |
57 | spinlock_t lock; | |
58 | u32 size; | |
59 | struct list_head list; | |
60 | }; | |
988b1343 | 61 | |
446fda4f PM |
62 | struct cipso_v4_map_cache_entry { |
63 | u32 hash; | |
64 | unsigned char *key; | |
65 | size_t key_len; | |
66 | ||
ffb733c6 | 67 | struct netlbl_lsm_cache *lsm_data; |
446fda4f PM |
68 | |
69 | u32 activity; | |
70 | struct list_head list; | |
71 | }; | |
988b1343 FF |
72 | |
73 | static struct cipso_v4_map_cache_bkt *cipso_v4_cache; | |
446fda4f PM |
74 | |
75 | /* Restricted bitmap (tag #1) flags */ | |
db9c8e2b | 76 | int cipso_v4_rbm_optfmt; |
446fda4f PM |
77 | int cipso_v4_rbm_strictvalid = 1; |
78 | ||
f998e8cb PM |
79 | /* |
80 | * Protocol Constants | |
81 | */ | |
82 | ||
83 | /* Maximum size of the CIPSO IP option, derived from the fact that the maximum | |
84 | * IPv4 header size is 60 bytes and the base IPv4 header is 20 bytes long. */ | |
85 | #define CIPSO_V4_OPT_LEN_MAX 40 | |
86 | ||
87 | /* Length of the base CIPSO option, this includes the option type (1 byte), the | |
88 | * option length (1 byte), and the DOI (4 bytes). */ | |
89 | #define CIPSO_V4_HDR_LEN 6 | |
90 | ||
91 | /* Base length of the restrictive category bitmap tag (tag #1). */ | |
92 | #define CIPSO_V4_TAG_RBM_BLEN 4 | |
93 | ||
94 | /* Base length of the enumerated category tag (tag #2). */ | |
95 | #define CIPSO_V4_TAG_ENUM_BLEN 4 | |
96 | ||
97 | /* Base length of the ranged categories bitmap tag (tag #5). */ | |
98 | #define CIPSO_V4_TAG_RNG_BLEN 4 | |
99 | /* The maximum number of category ranges permitted in the ranged category tag | |
100 | * (tag #5). You may note that the IETF draft states that the maximum number | |
101 | * of category ranges is 7, but if the low end of the last category range is | |
25985edc | 102 | * zero then it is possible to fit 8 category ranges because the zero should |
f998e8cb PM |
103 | * be omitted. */ |
104 | #define CIPSO_V4_TAG_RNG_CAT_MAX 8 | |
105 | ||
15c45f7b PM |
106 | /* Base length of the local tag (non-standard tag). |
107 | * Tag definition (may change between kernel versions) | |
108 | * | |
109 | * 0 8 16 24 32 | |
110 | * +----------+----------+----------+----------+ | |
111 | * | 10000000 | 00000110 | 32-bit secid value | | |
112 | * +----------+----------+----------+----------+ | |
113 | * | in (host byte order)| | |
114 | * +----------+----------+ | |
115 | * | |
116 | */ | |
117 | #define CIPSO_V4_TAG_LOC_BLEN 6 | |
118 | ||
446fda4f PM |
119 | /* |
120 | * Helper Functions | |
121 | */ | |
122 | ||
446fda4f PM |
123 | /** |
124 | * cipso_v4_cache_entry_free - Frees a cache entry | |
125 | * @entry: the entry to free | |
126 | * | |
127 | * Description: | |
ffb733c6 | 128 | * This function frees the memory associated with a cache entry including the |
129 | * LSM cache data if there are no longer any users, i.e. reference count == 0. | |
446fda4f PM |
130 | * |
131 | */ | |
132 | static void cipso_v4_cache_entry_free(struct cipso_v4_map_cache_entry *entry) | |
133 | { | |
ffb733c6 | 134 | if (entry->lsm_data) |
135 | netlbl_secattr_cache_free(entry->lsm_data); | |
446fda4f PM |
136 | kfree(entry->key); |
137 | kfree(entry); | |
138 | } | |
139 | ||
140 | /** | |
141 | * cipso_v4_map_cache_hash - Hashing function for the CIPSO cache | |
142 | * @key: the hash key | |
143 | * @key_len: the length of the key in bytes | |
144 | * | |
145 | * Description: | |
146 | * The CIPSO tag hashing function. Returns a 32-bit hash value. | |
147 | * | |
148 | */ | |
149 | static u32 cipso_v4_map_cache_hash(const unsigned char *key, u32 key_len) | |
150 | { | |
151 | return jhash(key, key_len, 0); | |
152 | } | |
153 | ||
154 | /* | |
155 | * Label Mapping Cache Functions | |
156 | */ | |
157 | ||
158 | /** | |
159 | * cipso_v4_cache_init - Initialize the CIPSO cache | |
160 | * | |
161 | * Description: | |
162 | * Initializes the CIPSO label mapping cache, this function should be called | |
163 | * before any of the other functions defined in this file. Returns zero on | |
164 | * success, negative values on error. | |
165 | * | |
166 | */ | |
cb57659a | 167 | static int __init cipso_v4_cache_init(void) |
446fda4f PM |
168 | { |
169 | u32 iter; | |
170 | ||
171 | cipso_v4_cache = kcalloc(CIPSO_V4_CACHE_BUCKETS, | |
172 | sizeof(struct cipso_v4_map_cache_bkt), | |
173 | GFP_KERNEL); | |
51456b29 | 174 | if (!cipso_v4_cache) |
446fda4f PM |
175 | return -ENOMEM; |
176 | ||
177 | for (iter = 0; iter < CIPSO_V4_CACHE_BUCKETS; iter++) { | |
178 | spin_lock_init(&cipso_v4_cache[iter].lock); | |
179 | cipso_v4_cache[iter].size = 0; | |
180 | INIT_LIST_HEAD(&cipso_v4_cache[iter].list); | |
181 | } | |
182 | ||
183 | return 0; | |
184 | } | |
185 | ||
186 | /** | |
187 | * cipso_v4_cache_invalidate - Invalidates the current CIPSO cache | |
188 | * | |
189 | * Description: | |
4ac9e23c | 190 | * Invalidates and frees any entries in the CIPSO cache. |
446fda4f PM |
191 | * |
192 | */ | |
193 | void cipso_v4_cache_invalidate(void) | |
194 | { | |
195 | struct cipso_v4_map_cache_entry *entry, *tmp_entry; | |
196 | u32 iter; | |
197 | ||
198 | for (iter = 0; iter < CIPSO_V4_CACHE_BUCKETS; iter++) { | |
609c92fe | 199 | spin_lock_bh(&cipso_v4_cache[iter].lock); |
446fda4f PM |
200 | list_for_each_entry_safe(entry, |
201 | tmp_entry, | |
202 | &cipso_v4_cache[iter].list, list) { | |
203 | list_del(&entry->list); | |
204 | cipso_v4_cache_entry_free(entry); | |
205 | } | |
206 | cipso_v4_cache[iter].size = 0; | |
609c92fe | 207 | spin_unlock_bh(&cipso_v4_cache[iter].lock); |
446fda4f | 208 | } |
446fda4f PM |
209 | } |
210 | ||
211 | /** | |
212 | * cipso_v4_cache_check - Check the CIPSO cache for a label mapping | |
213 | * @key: the buffer to check | |
214 | * @key_len: buffer length in bytes | |
215 | * @secattr: the security attribute struct to use | |
216 | * | |
217 | * Description: | |
218 | * This function checks the cache to see if a label mapping already exists for | |
219 | * the given key. If there is a match then the cache is adjusted and the | |
220 | * @secattr struct is populated with the correct LSM security attributes. The | |
221 | * cache is adjusted in the following manner if the entry is not already the | |
222 | * first in the cache bucket: | |
223 | * | |
224 | * 1. The cache entry's activity counter is incremented | |
225 | * 2. The previous (higher ranking) entry's activity counter is decremented | |
226 | * 3. If the difference between the two activity counters is geater than | |
227 | * CIPSO_V4_CACHE_REORDERLIMIT the two entries are swapped | |
228 | * | |
229 | * Returns zero on success, -ENOENT for a cache miss, and other negative values | |
230 | * on error. | |
231 | * | |
232 | */ | |
233 | static int cipso_v4_cache_check(const unsigned char *key, | |
234 | u32 key_len, | |
235 | struct netlbl_lsm_secattr *secattr) | |
236 | { | |
237 | u32 bkt; | |
238 | struct cipso_v4_map_cache_entry *entry; | |
239 | struct cipso_v4_map_cache_entry *prev_entry = NULL; | |
240 | u32 hash; | |
241 | ||
dd44f04b | 242 | if (!READ_ONCE(cipso_v4_cache_enabled)) |
446fda4f PM |
243 | return -ENOENT; |
244 | ||
245 | hash = cipso_v4_map_cache_hash(key, key_len); | |
5e0f8923 | 246 | bkt = hash & (CIPSO_V4_CACHE_BUCKETS - 1); |
609c92fe | 247 | spin_lock_bh(&cipso_v4_cache[bkt].lock); |
446fda4f PM |
248 | list_for_each_entry(entry, &cipso_v4_cache[bkt].list, list) { |
249 | if (entry->hash == hash && | |
250 | entry->key_len == key_len && | |
251 | memcmp(entry->key, key, key_len) == 0) { | |
252 | entry->activity += 1; | |
b4217b82 | 253 | refcount_inc(&entry->lsm_data->refcount); |
ffb733c6 | 254 | secattr->cache = entry->lsm_data; |
701a90ba | 255 | secattr->flags |= NETLBL_SECATTR_CACHE; |
16efd454 | 256 | secattr->type = NETLBL_NLTYPE_CIPSOV4; |
51456b29 | 257 | if (!prev_entry) { |
609c92fe | 258 | spin_unlock_bh(&cipso_v4_cache[bkt].lock); |
446fda4f PM |
259 | return 0; |
260 | } | |
261 | ||
262 | if (prev_entry->activity > 0) | |
263 | prev_entry->activity -= 1; | |
264 | if (entry->activity > prev_entry->activity && | |
265 | entry->activity - prev_entry->activity > | |
266 | CIPSO_V4_CACHE_REORDERLIMIT) { | |
267 | __list_del(entry->list.prev, entry->list.next); | |
268 | __list_add(&entry->list, | |
269 | prev_entry->list.prev, | |
270 | &prev_entry->list); | |
271 | } | |
272 | ||
609c92fe | 273 | spin_unlock_bh(&cipso_v4_cache[bkt].lock); |
446fda4f PM |
274 | return 0; |
275 | } | |
276 | prev_entry = entry; | |
277 | } | |
609c92fe | 278 | spin_unlock_bh(&cipso_v4_cache[bkt].lock); |
446fda4f PM |
279 | |
280 | return -ENOENT; | |
281 | } | |
282 | ||
283 | /** | |
284 | * cipso_v4_cache_add - Add an entry to the CIPSO cache | |
3628e3cb | 285 | * @cipso_ptr: pointer to CIPSO IP option |
446fda4f PM |
286 | * @secattr: the packet's security attributes |
287 | * | |
288 | * Description: | |
289 | * Add a new entry into the CIPSO label mapping cache. Add the new entry to | |
290 | * head of the cache bucket's list, if the cache bucket is out of room remove | |
291 | * the last entry in the list first. It is important to note that there is | |
292 | * currently no checking for duplicate keys. Returns zero on success, | |
293 | * negative values on failure. | |
294 | * | |
295 | */ | |
04f81f01 | 296 | int cipso_v4_cache_add(const unsigned char *cipso_ptr, |
446fda4f PM |
297 | const struct netlbl_lsm_secattr *secattr) |
298 | { | |
dd44f04b | 299 | int bkt_size = READ_ONCE(cipso_v4_cache_bucketsize); |
446fda4f PM |
300 | int ret_val = -EPERM; |
301 | u32 bkt; | |
302 | struct cipso_v4_map_cache_entry *entry = NULL; | |
303 | struct cipso_v4_map_cache_entry *old_entry = NULL; | |
446fda4f PM |
304 | u32 cipso_ptr_len; |
305 | ||
dd44f04b | 306 | if (!READ_ONCE(cipso_v4_cache_enabled) || bkt_size <= 0) |
446fda4f PM |
307 | return 0; |
308 | ||
446fda4f PM |
309 | cipso_ptr_len = cipso_ptr[1]; |
310 | ||
311 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); | |
51456b29 | 312 | if (!entry) |
446fda4f | 313 | return -ENOMEM; |
fac5d731 | 314 | entry->key = kmemdup(cipso_ptr, cipso_ptr_len, GFP_ATOMIC); |
51456b29 | 315 | if (!entry->key) { |
446fda4f PM |
316 | ret_val = -ENOMEM; |
317 | goto cache_add_failure; | |
318 | } | |
446fda4f PM |
319 | entry->key_len = cipso_ptr_len; |
320 | entry->hash = cipso_v4_map_cache_hash(cipso_ptr, cipso_ptr_len); | |
b4217b82 | 321 | refcount_inc(&secattr->cache->refcount); |
ffb733c6 | 322 | entry->lsm_data = secattr->cache; |
446fda4f | 323 | |
5e0f8923 | 324 | bkt = entry->hash & (CIPSO_V4_CACHE_BUCKETS - 1); |
609c92fe | 325 | spin_lock_bh(&cipso_v4_cache[bkt].lock); |
dd44f04b | 326 | if (cipso_v4_cache[bkt].size < bkt_size) { |
446fda4f PM |
327 | list_add(&entry->list, &cipso_v4_cache[bkt].list); |
328 | cipso_v4_cache[bkt].size += 1; | |
329 | } else { | |
330 | old_entry = list_entry(cipso_v4_cache[bkt].list.prev, | |
331 | struct cipso_v4_map_cache_entry, list); | |
332 | list_del(&old_entry->list); | |
333 | list_add(&entry->list, &cipso_v4_cache[bkt].list); | |
334 | cipso_v4_cache_entry_free(old_entry); | |
335 | } | |
609c92fe | 336 | spin_unlock_bh(&cipso_v4_cache[bkt].lock); |
446fda4f PM |
337 | |
338 | return 0; | |
339 | ||
340 | cache_add_failure: | |
341 | if (entry) | |
342 | cipso_v4_cache_entry_free(entry); | |
343 | return ret_val; | |
344 | } | |
345 | ||
346 | /* | |
347 | * DOI List Functions | |
348 | */ | |
349 | ||
350 | /** | |
351 | * cipso_v4_doi_search - Searches for a DOI definition | |
352 | * @doi: the DOI to search for | |
353 | * | |
354 | * Description: | |
355 | * Search the DOI definition list for a DOI definition with a DOI value that | |
25985edc | 356 | * matches @doi. The caller is responsible for calling rcu_read_[un]lock(). |
446fda4f PM |
357 | * Returns a pointer to the DOI definition on success and NULL on failure. |
358 | */ | |
359 | static struct cipso_v4_doi *cipso_v4_doi_search(u32 doi) | |
360 | { | |
361 | struct cipso_v4_doi *iter; | |
362 | ||
363 | list_for_each_entry_rcu(iter, &cipso_v4_doi_list, list) | |
f6a6fede | 364 | if (iter->doi == doi && refcount_read(&iter->refcount)) |
446fda4f PM |
365 | return iter; |
366 | return NULL; | |
367 | } | |
368 | ||
369 | /** | |
370 | * cipso_v4_doi_add - Add a new DOI to the CIPSO protocol engine | |
371 | * @doi_def: the DOI structure | |
6c2e8ac0 | 372 | * @audit_info: NetLabel audit information |
446fda4f PM |
373 | * |
374 | * Description: | |
375 | * The caller defines a new DOI for use by the CIPSO engine and calls this | |
376 | * function to add it to the list of acceptable domains. The caller must | |
377 | * ensure that the mapping table specified in @doi_def->map meets all of the | |
378 | * requirements of the mapping type (see cipso_ipv4.h for details). Returns | |
379 | * zero on success and non-zero on failure. | |
380 | * | |
381 | */ | |
6c2e8ac0 PM |
382 | int cipso_v4_doi_add(struct cipso_v4_doi *doi_def, |
383 | struct netlbl_audit *audit_info) | |
446fda4f | 384 | { |
6c2e8ac0 | 385 | int ret_val = -EINVAL; |
6ce61a7c | 386 | u32 iter; |
6c2e8ac0 PM |
387 | u32 doi; |
388 | u32 doi_type; | |
389 | struct audit_buffer *audit_buf; | |
390 | ||
391 | doi = doi_def->doi; | |
392 | doi_type = doi_def->type; | |
6ce61a7c | 393 | |
56755924 | 394 | if (doi_def->doi == CIPSO_V4_DOI_UNKNOWN) |
6c2e8ac0 | 395 | goto doi_add_return; |
6ce61a7c PM |
396 | for (iter = 0; iter < CIPSO_V4_TAG_MAXCNT; iter++) { |
397 | switch (doi_def->tags[iter]) { | |
398 | case CIPSO_V4_TAG_RBITMAP: | |
399 | break; | |
484b3669 | 400 | case CIPSO_V4_TAG_RANGE: |
654bbc2a PM |
401 | case CIPSO_V4_TAG_ENUM: |
402 | if (doi_def->type != CIPSO_V4_MAP_PASS) | |
6c2e8ac0 | 403 | goto doi_add_return; |
654bbc2a | 404 | break; |
15c45f7b PM |
405 | case CIPSO_V4_TAG_LOCAL: |
406 | if (doi_def->type != CIPSO_V4_MAP_LOCAL) | |
6c2e8ac0 PM |
407 | goto doi_add_return; |
408 | break; | |
409 | case CIPSO_V4_TAG_INVALID: | |
410 | if (iter == 0) | |
411 | goto doi_add_return; | |
15c45f7b | 412 | break; |
6ce61a7c | 413 | default: |
6c2e8ac0 | 414 | goto doi_add_return; |
6ce61a7c PM |
415 | } |
416 | } | |
446fda4f | 417 | |
f6a6fede | 418 | refcount_set(&doi_def->refcount, 1); |
446fda4f | 419 | |
446fda4f | 420 | spin_lock(&cipso_v4_doi_list_lock); |
00db4124 | 421 | if (cipso_v4_doi_search(doi_def->doi)) { |
6c2e8ac0 PM |
422 | spin_unlock(&cipso_v4_doi_list_lock); |
423 | ret_val = -EEXIST; | |
424 | goto doi_add_return; | |
425 | } | |
446fda4f PM |
426 | list_add_tail_rcu(&doi_def->list, &cipso_v4_doi_list); |
427 | spin_unlock(&cipso_v4_doi_list_lock); | |
6c2e8ac0 PM |
428 | ret_val = 0; |
429 | ||
430 | doi_add_return: | |
431 | audit_buf = netlbl_audit_start(AUDIT_MAC_CIPSOV4_ADD, audit_info); | |
00db4124 | 432 | if (audit_buf) { |
6c2e8ac0 PM |
433 | const char *type_str; |
434 | switch (doi_type) { | |
435 | case CIPSO_V4_MAP_TRANS: | |
436 | type_str = "trans"; | |
437 | break; | |
438 | case CIPSO_V4_MAP_PASS: | |
439 | type_str = "pass"; | |
440 | break; | |
441 | case CIPSO_V4_MAP_LOCAL: | |
442 | type_str = "local"; | |
443 | break; | |
444 | default: | |
445 | type_str = "(unknown)"; | |
446 | } | |
447 | audit_log_format(audit_buf, | |
448 | " cipso_doi=%u cipso_type=%s res=%u", | |
449 | doi, type_str, ret_val == 0 ? 1 : 0); | |
450 | audit_log_end(audit_buf); | |
451 | } | |
446fda4f | 452 | |
6c2e8ac0 | 453 | return ret_val; |
446fda4f PM |
454 | } |
455 | ||
b1edeb10 PM |
456 | /** |
457 | * cipso_v4_doi_free - Frees a DOI definition | |
4973404f | 458 | * @doi_def: the DOI definition |
b1edeb10 PM |
459 | * |
460 | * Description: | |
461 | * This function frees all of the memory associated with a DOI definition. | |
462 | * | |
463 | */ | |
464 | void cipso_v4_doi_free(struct cipso_v4_doi *doi_def) | |
465 | { | |
51456b29 | 466 | if (!doi_def) |
b1edeb10 PM |
467 | return; |
468 | ||
9756e44f | 469 | switch (doi_def->type) { |
470 | case CIPSO_V4_MAP_TRANS: | |
471 | kfree(doi_def->map.std->lvl.cipso); | |
472 | kfree(doi_def->map.std->lvl.local); | |
473 | kfree(doi_def->map.std->cat.cipso); | |
474 | kfree(doi_def->map.std->cat.local); | |
475 | kfree(doi_def->map.std); | |
476 | break; | |
b1edeb10 PM |
477 | } |
478 | kfree(doi_def); | |
479 | } | |
480 | ||
481 | /** | |
482 | * cipso_v4_doi_free_rcu - Frees a DOI definition via the RCU pointer | |
483 | * @entry: the entry's RCU field | |
484 | * | |
485 | * Description: | |
486 | * This function is designed to be used as a callback to the call_rcu() | |
487 | * function so that the memory allocated to the DOI definition can be released | |
488 | * safely. | |
489 | * | |
490 | */ | |
491 | static void cipso_v4_doi_free_rcu(struct rcu_head *entry) | |
492 | { | |
493 | struct cipso_v4_doi *doi_def; | |
494 | ||
495 | doi_def = container_of(entry, struct cipso_v4_doi, rcu); | |
496 | cipso_v4_doi_free(doi_def); | |
497 | } | |
498 | ||
446fda4f PM |
499 | /** |
500 | * cipso_v4_doi_remove - Remove an existing DOI from the CIPSO protocol engine | |
501 | * @doi: the DOI value | |
7edce636 | 502 | * @audit_info: NetLabel audit information |
446fda4f PM |
503 | * |
504 | * Description: | |
b1edeb10 PM |
505 | * Removes a DOI definition from the CIPSO engine. The NetLabel routines will |
506 | * be called to release their own LSM domain mappings as well as our own | |
507 | * domain list. Returns zero on success and negative values on failure. | |
446fda4f PM |
508 | * |
509 | */ | |
b1edeb10 | 510 | int cipso_v4_doi_remove(u32 doi, struct netlbl_audit *audit_info) |
446fda4f | 511 | { |
6c2e8ac0 | 512 | int ret_val; |
446fda4f | 513 | struct cipso_v4_doi *doi_def; |
6c2e8ac0 | 514 | struct audit_buffer *audit_buf; |
446fda4f | 515 | |
4be2700f PM |
516 | spin_lock(&cipso_v4_doi_list_lock); |
517 | doi_def = cipso_v4_doi_search(doi); | |
51456b29 | 518 | if (!doi_def) { |
446fda4f | 519 | spin_unlock(&cipso_v4_doi_list_lock); |
6c2e8ac0 PM |
520 | ret_val = -ENOENT; |
521 | goto doi_remove_return; | |
446fda4f | 522 | } |
b1edeb10 | 523 | list_del_rcu(&doi_def->list); |
4be2700f | 524 | spin_unlock(&cipso_v4_doi_list_lock); |
446fda4f | 525 | |
ad5d07f4 | 526 | cipso_v4_doi_putdef(doi_def); |
6c2e8ac0 PM |
527 | ret_val = 0; |
528 | ||
529 | doi_remove_return: | |
530 | audit_buf = netlbl_audit_start(AUDIT_MAC_CIPSOV4_DEL, audit_info); | |
00db4124 | 531 | if (audit_buf) { |
6c2e8ac0 PM |
532 | audit_log_format(audit_buf, |
533 | " cipso_doi=%u res=%u", | |
534 | doi, ret_val == 0 ? 1 : 0); | |
535 | audit_log_end(audit_buf); | |
536 | } | |
b1edeb10 | 537 | |
6c2e8ac0 | 538 | return ret_val; |
446fda4f PM |
539 | } |
540 | ||
541 | /** | |
b1edeb10 | 542 | * cipso_v4_doi_getdef - Returns a reference to a valid DOI definition |
446fda4f PM |
543 | * @doi: the DOI value |
544 | * | |
545 | * Description: | |
546 | * Searches for a valid DOI definition and if one is found it is returned to | |
547 | * the caller. Otherwise NULL is returned. The caller must ensure that | |
b1edeb10 PM |
548 | * rcu_read_lock() is held while accessing the returned definition and the DOI |
549 | * definition reference count is decremented when the caller is done. | |
446fda4f PM |
550 | * |
551 | */ | |
552 | struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi) | |
553 | { | |
b1edeb10 PM |
554 | struct cipso_v4_doi *doi_def; |
555 | ||
556 | rcu_read_lock(); | |
557 | doi_def = cipso_v4_doi_search(doi); | |
51456b29 | 558 | if (!doi_def) |
b1edeb10 | 559 | goto doi_getdef_return; |
f6a6fede | 560 | if (!refcount_inc_not_zero(&doi_def->refcount)) |
b1edeb10 PM |
561 | doi_def = NULL; |
562 | ||
563 | doi_getdef_return: | |
564 | rcu_read_unlock(); | |
565 | return doi_def; | |
566 | } | |
567 | ||
568 | /** | |
569 | * cipso_v4_doi_putdef - Releases a reference for the given DOI definition | |
570 | * @doi_def: the DOI definition | |
571 | * | |
572 | * Description: | |
573 | * Releases a DOI definition reference obtained from cipso_v4_doi_getdef(). | |
574 | * | |
575 | */ | |
576 | void cipso_v4_doi_putdef(struct cipso_v4_doi *doi_def) | |
577 | { | |
51456b29 | 578 | if (!doi_def) |
b1edeb10 PM |
579 | return; |
580 | ||
f6a6fede | 581 | if (!refcount_dec_and_test(&doi_def->refcount)) |
b1edeb10 | 582 | return; |
b1edeb10 PM |
583 | |
584 | cipso_v4_cache_invalidate(); | |
585 | call_rcu(&doi_def->rcu, cipso_v4_doi_free_rcu); | |
446fda4f PM |
586 | } |
587 | ||
588 | /** | |
fcd48280 PM |
589 | * cipso_v4_doi_walk - Iterate through the DOI definitions |
590 | * @skip_cnt: skip past this number of DOI definitions, updated | |
591 | * @callback: callback for each DOI definition | |
592 | * @cb_arg: argument for the callback function | |
446fda4f PM |
593 | * |
594 | * Description: | |
fcd48280 PM |
595 | * Iterate over the DOI definition list, skipping the first @skip_cnt entries. |
596 | * For each entry call @callback, if @callback returns a negative value stop | |
597 | * 'walking' through the list and return. Updates the value in @skip_cnt upon | |
598 | * return. Returns zero on success, negative values on failure. | |
446fda4f PM |
599 | * |
600 | */ | |
fcd48280 PM |
601 | int cipso_v4_doi_walk(u32 *skip_cnt, |
602 | int (*callback) (struct cipso_v4_doi *doi_def, void *arg), | |
603 | void *cb_arg) | |
446fda4f | 604 | { |
fcd48280 | 605 | int ret_val = -ENOENT; |
446fda4f | 606 | u32 doi_cnt = 0; |
fcd48280 | 607 | struct cipso_v4_doi *iter_doi; |
446fda4f | 608 | |
446fda4f | 609 | rcu_read_lock(); |
fcd48280 | 610 | list_for_each_entry_rcu(iter_doi, &cipso_v4_doi_list, list) |
f6a6fede | 611 | if (refcount_read(&iter_doi->refcount) > 0) { |
fcd48280 PM |
612 | if (doi_cnt++ < *skip_cnt) |
613 | continue; | |
614 | ret_val = callback(iter_doi, cb_arg); | |
615 | if (ret_val < 0) { | |
616 | doi_cnt--; | |
617 | goto doi_walk_return; | |
446fda4f | 618 | } |
446fda4f | 619 | } |
446fda4f | 620 | |
fcd48280 | 621 | doi_walk_return: |
446fda4f | 622 | rcu_read_unlock(); |
fcd48280 PM |
623 | *skip_cnt = doi_cnt; |
624 | return ret_val; | |
446fda4f PM |
625 | } |
626 | ||
446fda4f PM |
627 | /* |
628 | * Label Mapping Functions | |
629 | */ | |
630 | ||
631 | /** | |
632 | * cipso_v4_map_lvl_valid - Checks to see if the given level is understood | |
633 | * @doi_def: the DOI definition | |
634 | * @level: the level to check | |
635 | * | |
636 | * Description: | |
637 | * Checks the given level against the given DOI definition and returns a | |
638 | * negative value if the level does not have a valid mapping and a zero value | |
639 | * if the level is defined by the DOI. | |
640 | * | |
641 | */ | |
642 | static int cipso_v4_map_lvl_valid(const struct cipso_v4_doi *doi_def, u8 level) | |
643 | { | |
644 | switch (doi_def->type) { | |
645 | case CIPSO_V4_MAP_PASS: | |
646 | return 0; | |
15c45f7b | 647 | case CIPSO_V4_MAP_TRANS: |
5578de48 PM |
648 | if ((level < doi_def->map.std->lvl.cipso_size) && |
649 | (doi_def->map.std->lvl.cipso[level] < CIPSO_V4_INV_LVL)) | |
446fda4f PM |
650 | return 0; |
651 | break; | |
652 | } | |
653 | ||
654 | return -EFAULT; | |
655 | } | |
656 | ||
657 | /** | |
658 | * cipso_v4_map_lvl_hton - Perform a level mapping from the host to the network | |
659 | * @doi_def: the DOI definition | |
660 | * @host_lvl: the host MLS level | |
661 | * @net_lvl: the network/CIPSO MLS level | |
662 | * | |
663 | * Description: | |
664 | * Perform a label mapping to translate a local MLS level to the correct | |
665 | * CIPSO level using the given DOI definition. Returns zero on success, | |
666 | * negative values otherwise. | |
667 | * | |
668 | */ | |
669 | static int cipso_v4_map_lvl_hton(const struct cipso_v4_doi *doi_def, | |
670 | u32 host_lvl, | |
671 | u32 *net_lvl) | |
672 | { | |
673 | switch (doi_def->type) { | |
674 | case CIPSO_V4_MAP_PASS: | |
675 | *net_lvl = host_lvl; | |
676 | return 0; | |
15c45f7b | 677 | case CIPSO_V4_MAP_TRANS: |
c6387a86 PM |
678 | if (host_lvl < doi_def->map.std->lvl.local_size && |
679 | doi_def->map.std->lvl.local[host_lvl] < CIPSO_V4_INV_LVL) { | |
446fda4f PM |
680 | *net_lvl = doi_def->map.std->lvl.local[host_lvl]; |
681 | return 0; | |
682 | } | |
c6387a86 | 683 | return -EPERM; |
446fda4f PM |
684 | } |
685 | ||
686 | return -EINVAL; | |
687 | } | |
688 | ||
689 | /** | |
690 | * cipso_v4_map_lvl_ntoh - Perform a level mapping from the network to the host | |
691 | * @doi_def: the DOI definition | |
692 | * @net_lvl: the network/CIPSO MLS level | |
693 | * @host_lvl: the host MLS level | |
694 | * | |
695 | * Description: | |
696 | * Perform a label mapping to translate a CIPSO level to the correct local MLS | |
697 | * level using the given DOI definition. Returns zero on success, negative | |
698 | * values otherwise. | |
699 | * | |
700 | */ | |
701 | static int cipso_v4_map_lvl_ntoh(const struct cipso_v4_doi *doi_def, | |
702 | u32 net_lvl, | |
703 | u32 *host_lvl) | |
704 | { | |
705 | struct cipso_v4_std_map_tbl *map_tbl; | |
706 | ||
707 | switch (doi_def->type) { | |
708 | case CIPSO_V4_MAP_PASS: | |
709 | *host_lvl = net_lvl; | |
710 | return 0; | |
15c45f7b | 711 | case CIPSO_V4_MAP_TRANS: |
446fda4f PM |
712 | map_tbl = doi_def->map.std; |
713 | if (net_lvl < map_tbl->lvl.cipso_size && | |
714 | map_tbl->lvl.cipso[net_lvl] < CIPSO_V4_INV_LVL) { | |
715 | *host_lvl = doi_def->map.std->lvl.cipso[net_lvl]; | |
716 | return 0; | |
717 | } | |
c6387a86 | 718 | return -EPERM; |
446fda4f PM |
719 | } |
720 | ||
721 | return -EINVAL; | |
722 | } | |
723 | ||
724 | /** | |
725 | * cipso_v4_map_cat_rbm_valid - Checks to see if the category bitmap is valid | |
726 | * @doi_def: the DOI definition | |
727 | * @bitmap: category bitmap | |
728 | * @bitmap_len: bitmap length in bytes | |
729 | * | |
730 | * Description: | |
731 | * Checks the given category bitmap against the given DOI definition and | |
732 | * returns a negative value if any of the categories in the bitmap do not have | |
733 | * a valid mapping and a zero value if all of the categories are valid. | |
734 | * | |
735 | */ | |
736 | static int cipso_v4_map_cat_rbm_valid(const struct cipso_v4_doi *doi_def, | |
737 | const unsigned char *bitmap, | |
738 | u32 bitmap_len) | |
739 | { | |
740 | int cat = -1; | |
741 | u32 bitmap_len_bits = bitmap_len * 8; | |
044a68ed PM |
742 | u32 cipso_cat_size; |
743 | u32 *cipso_array; | |
446fda4f PM |
744 | |
745 | switch (doi_def->type) { | |
746 | case CIPSO_V4_MAP_PASS: | |
747 | return 0; | |
15c45f7b | 748 | case CIPSO_V4_MAP_TRANS: |
044a68ed PM |
749 | cipso_cat_size = doi_def->map.std->cat.cipso_size; |
750 | cipso_array = doi_def->map.std->cat.cipso; | |
446fda4f | 751 | for (;;) { |
3faa8f98 HD |
752 | cat = netlbl_bitmap_walk(bitmap, |
753 | bitmap_len_bits, | |
754 | cat + 1, | |
755 | 1); | |
446fda4f PM |
756 | if (cat < 0) |
757 | break; | |
758 | if (cat >= cipso_cat_size || | |
759 | cipso_array[cat] >= CIPSO_V4_INV_CAT) | |
760 | return -EFAULT; | |
761 | } | |
762 | ||
763 | if (cat == -1) | |
764 | return 0; | |
765 | break; | |
766 | } | |
767 | ||
768 | return -EFAULT; | |
769 | } | |
770 | ||
771 | /** | |
772 | * cipso_v4_map_cat_rbm_hton - Perform a category mapping from host to network | |
773 | * @doi_def: the DOI definition | |
02752760 | 774 | * @secattr: the security attributes |
446fda4f PM |
775 | * @net_cat: the zero'd out category bitmap in network/CIPSO format |
776 | * @net_cat_len: the length of the CIPSO bitmap in bytes | |
777 | * | |
778 | * Description: | |
779 | * Perform a label mapping to translate a local MLS category bitmap to the | |
780 | * correct CIPSO bitmap using the given DOI definition. Returns the minimum | |
781 | * size in bytes of the network bitmap on success, negative values otherwise. | |
782 | * | |
783 | */ | |
784 | static int cipso_v4_map_cat_rbm_hton(const struct cipso_v4_doi *doi_def, | |
02752760 | 785 | const struct netlbl_lsm_secattr *secattr, |
446fda4f PM |
786 | unsigned char *net_cat, |
787 | u32 net_cat_len) | |
788 | { | |
789 | int host_spot = -1; | |
02752760 | 790 | u32 net_spot = CIPSO_V4_INV_CAT; |
446fda4f | 791 | u32 net_spot_max = 0; |
446fda4f | 792 | u32 net_clen_bits = net_cat_len * 8; |
02752760 PM |
793 | u32 host_cat_size = 0; |
794 | u32 *host_cat_array = NULL; | |
446fda4f | 795 | |
15c45f7b | 796 | if (doi_def->type == CIPSO_V4_MAP_TRANS) { |
044a68ed PM |
797 | host_cat_size = doi_def->map.std->cat.local_size; |
798 | host_cat_array = doi_def->map.std->cat.local; | |
02752760 PM |
799 | } |
800 | ||
801 | for (;;) { | |
4fbe63d1 PM |
802 | host_spot = netlbl_catmap_walk(secattr->attr.mls.cat, |
803 | host_spot + 1); | |
02752760 PM |
804 | if (host_spot < 0) |
805 | break; | |
806 | ||
807 | switch (doi_def->type) { | |
808 | case CIPSO_V4_MAP_PASS: | |
809 | net_spot = host_spot; | |
810 | break; | |
15c45f7b | 811 | case CIPSO_V4_MAP_TRANS: |
446fda4f PM |
812 | if (host_spot >= host_cat_size) |
813 | return -EPERM; | |
446fda4f | 814 | net_spot = host_cat_array[host_spot]; |
9fade4bf PM |
815 | if (net_spot >= CIPSO_V4_INV_CAT) |
816 | return -EPERM; | |
02752760 | 817 | break; |
446fda4f | 818 | } |
02752760 PM |
819 | if (net_spot >= net_clen_bits) |
820 | return -ENOSPC; | |
3faa8f98 | 821 | netlbl_bitmap_setbit(net_cat, net_spot, 1); |
446fda4f | 822 | |
02752760 PM |
823 | if (net_spot > net_spot_max) |
824 | net_spot_max = net_spot; | |
446fda4f PM |
825 | } |
826 | ||
02752760 PM |
827 | if (++net_spot_max % 8) |
828 | return net_spot_max / 8 + 1; | |
829 | return net_spot_max / 8; | |
446fda4f PM |
830 | } |
831 | ||
832 | /** | |
833 | * cipso_v4_map_cat_rbm_ntoh - Perform a category mapping from network to host | |
834 | * @doi_def: the DOI definition | |
835 | * @net_cat: the category bitmap in network/CIPSO format | |
836 | * @net_cat_len: the length of the CIPSO bitmap in bytes | |
02752760 | 837 | * @secattr: the security attributes |
446fda4f PM |
838 | * |
839 | * Description: | |
840 | * Perform a label mapping to translate a CIPSO bitmap to the correct local | |
02752760 PM |
841 | * MLS category bitmap using the given DOI definition. Returns zero on |
842 | * success, negative values on failure. | |
446fda4f PM |
843 | * |
844 | */ | |
845 | static int cipso_v4_map_cat_rbm_ntoh(const struct cipso_v4_doi *doi_def, | |
846 | const unsigned char *net_cat, | |
847 | u32 net_cat_len, | |
02752760 | 848 | struct netlbl_lsm_secattr *secattr) |
446fda4f | 849 | { |
02752760 | 850 | int ret_val; |
446fda4f | 851 | int net_spot = -1; |
02752760 | 852 | u32 host_spot = CIPSO_V4_INV_CAT; |
446fda4f | 853 | u32 net_clen_bits = net_cat_len * 8; |
02752760 PM |
854 | u32 net_cat_size = 0; |
855 | u32 *net_cat_array = NULL; | |
446fda4f | 856 | |
15c45f7b | 857 | if (doi_def->type == CIPSO_V4_MAP_TRANS) { |
044a68ed PM |
858 | net_cat_size = doi_def->map.std->cat.cipso_size; |
859 | net_cat_array = doi_def->map.std->cat.cipso; | |
02752760 | 860 | } |
446fda4f | 861 | |
02752760 | 862 | for (;;) { |
3faa8f98 HD |
863 | net_spot = netlbl_bitmap_walk(net_cat, |
864 | net_clen_bits, | |
865 | net_spot + 1, | |
866 | 1); | |
02752760 PM |
867 | if (net_spot < 0) { |
868 | if (net_spot == -2) | |
869 | return -EFAULT; | |
870 | return 0; | |
871 | } | |
872 | ||
873 | switch (doi_def->type) { | |
874 | case CIPSO_V4_MAP_PASS: | |
875 | host_spot = net_spot; | |
876 | break; | |
15c45f7b | 877 | case CIPSO_V4_MAP_TRANS: |
02752760 PM |
878 | if (net_spot >= net_cat_size) |
879 | return -EPERM; | |
446fda4f | 880 | host_spot = net_cat_array[net_spot]; |
9fade4bf PM |
881 | if (host_spot >= CIPSO_V4_INV_CAT) |
882 | return -EPERM; | |
02752760 | 883 | break; |
446fda4f | 884 | } |
4fbe63d1 | 885 | ret_val = netlbl_catmap_setbit(&secattr->attr.mls.cat, |
02752760 PM |
886 | host_spot, |
887 | GFP_ATOMIC); | |
888 | if (ret_val != 0) | |
889 | return ret_val; | |
446fda4f PM |
890 | } |
891 | ||
892 | return -EINVAL; | |
893 | } | |
894 | ||
654bbc2a PM |
895 | /** |
896 | * cipso_v4_map_cat_enum_valid - Checks to see if the categories are valid | |
897 | * @doi_def: the DOI definition | |
898 | * @enumcat: category list | |
899 | * @enumcat_len: length of the category list in bytes | |
900 | * | |
901 | * Description: | |
902 | * Checks the given categories against the given DOI definition and returns a | |
903 | * negative value if any of the categories do not have a valid mapping and a | |
904 | * zero value if all of the categories are valid. | |
905 | * | |
906 | */ | |
907 | static int cipso_v4_map_cat_enum_valid(const struct cipso_v4_doi *doi_def, | |
908 | const unsigned char *enumcat, | |
909 | u32 enumcat_len) | |
910 | { | |
911 | u16 cat; | |
912 | int cat_prev = -1; | |
913 | u32 iter; | |
914 | ||
915 | if (doi_def->type != CIPSO_V4_MAP_PASS || enumcat_len & 0x01) | |
916 | return -EFAULT; | |
917 | ||
918 | for (iter = 0; iter < enumcat_len; iter += 2) { | |
d3e2ce3b | 919 | cat = get_unaligned_be16(&enumcat[iter]); |
654bbc2a PM |
920 | if (cat <= cat_prev) |
921 | return -EFAULT; | |
922 | cat_prev = cat; | |
923 | } | |
924 | ||
925 | return 0; | |
926 | } | |
927 | ||
928 | /** | |
929 | * cipso_v4_map_cat_enum_hton - Perform a category mapping from host to network | |
930 | * @doi_def: the DOI definition | |
931 | * @secattr: the security attributes | |
932 | * @net_cat: the zero'd out category list in network/CIPSO format | |
933 | * @net_cat_len: the length of the CIPSO category list in bytes | |
934 | * | |
935 | * Description: | |
936 | * Perform a label mapping to translate a local MLS category bitmap to the | |
937 | * correct CIPSO category list using the given DOI definition. Returns the | |
938 | * size in bytes of the network category bitmap on success, negative values | |
939 | * otherwise. | |
940 | * | |
941 | */ | |
942 | static int cipso_v4_map_cat_enum_hton(const struct cipso_v4_doi *doi_def, | |
943 | const struct netlbl_lsm_secattr *secattr, | |
944 | unsigned char *net_cat, | |
945 | u32 net_cat_len) | |
946 | { | |
947 | int cat = -1; | |
948 | u32 cat_iter = 0; | |
949 | ||
950 | for (;;) { | |
4fbe63d1 | 951 | cat = netlbl_catmap_walk(secattr->attr.mls.cat, cat + 1); |
654bbc2a PM |
952 | if (cat < 0) |
953 | break; | |
954 | if ((cat_iter + 2) > net_cat_len) | |
955 | return -ENOSPC; | |
956 | ||
957 | *((__be16 *)&net_cat[cat_iter]) = htons(cat); | |
958 | cat_iter += 2; | |
959 | } | |
960 | ||
961 | return cat_iter; | |
962 | } | |
963 | ||
964 | /** | |
965 | * cipso_v4_map_cat_enum_ntoh - Perform a category mapping from network to host | |
966 | * @doi_def: the DOI definition | |
967 | * @net_cat: the category list in network/CIPSO format | |
968 | * @net_cat_len: the length of the CIPSO bitmap in bytes | |
969 | * @secattr: the security attributes | |
970 | * | |
971 | * Description: | |
972 | * Perform a label mapping to translate a CIPSO category list to the correct | |
973 | * local MLS category bitmap using the given DOI definition. Returns zero on | |
974 | * success, negative values on failure. | |
975 | * | |
976 | */ | |
977 | static int cipso_v4_map_cat_enum_ntoh(const struct cipso_v4_doi *doi_def, | |
978 | const unsigned char *net_cat, | |
979 | u32 net_cat_len, | |
980 | struct netlbl_lsm_secattr *secattr) | |
981 | { | |
982 | int ret_val; | |
983 | u32 iter; | |
984 | ||
985 | for (iter = 0; iter < net_cat_len; iter += 2) { | |
4fbe63d1 PM |
986 | ret_val = netlbl_catmap_setbit(&secattr->attr.mls.cat, |
987 | get_unaligned_be16(&net_cat[iter]), | |
988 | GFP_ATOMIC); | |
654bbc2a PM |
989 | if (ret_val != 0) |
990 | return ret_val; | |
991 | } | |
992 | ||
993 | return 0; | |
994 | } | |
995 | ||
484b3669 PM |
996 | /** |
997 | * cipso_v4_map_cat_rng_valid - Checks to see if the categories are valid | |
998 | * @doi_def: the DOI definition | |
999 | * @rngcat: category list | |
1000 | * @rngcat_len: length of the category list in bytes | |
1001 | * | |
1002 | * Description: | |
1003 | * Checks the given categories against the given DOI definition and returns a | |
1004 | * negative value if any of the categories do not have a valid mapping and a | |
1005 | * zero value if all of the categories are valid. | |
1006 | * | |
1007 | */ | |
1008 | static int cipso_v4_map_cat_rng_valid(const struct cipso_v4_doi *doi_def, | |
1009 | const unsigned char *rngcat, | |
1010 | u32 rngcat_len) | |
1011 | { | |
1012 | u16 cat_high; | |
1013 | u16 cat_low; | |
1014 | u32 cat_prev = CIPSO_V4_MAX_REM_CATS + 1; | |
1015 | u32 iter; | |
1016 | ||
1017 | if (doi_def->type != CIPSO_V4_MAP_PASS || rngcat_len & 0x01) | |
1018 | return -EFAULT; | |
1019 | ||
1020 | for (iter = 0; iter < rngcat_len; iter += 4) { | |
d3e2ce3b | 1021 | cat_high = get_unaligned_be16(&rngcat[iter]); |
484b3669 | 1022 | if ((iter + 4) <= rngcat_len) |
d3e2ce3b | 1023 | cat_low = get_unaligned_be16(&rngcat[iter + 2]); |
484b3669 PM |
1024 | else |
1025 | cat_low = 0; | |
1026 | ||
1027 | if (cat_high > cat_prev) | |
1028 | return -EFAULT; | |
1029 | ||
1030 | cat_prev = cat_low; | |
1031 | } | |
1032 | ||
1033 | return 0; | |
1034 | } | |
1035 | ||
1036 | /** | |
1037 | * cipso_v4_map_cat_rng_hton - Perform a category mapping from host to network | |
1038 | * @doi_def: the DOI definition | |
1039 | * @secattr: the security attributes | |
1040 | * @net_cat: the zero'd out category list in network/CIPSO format | |
1041 | * @net_cat_len: the length of the CIPSO category list in bytes | |
1042 | * | |
1043 | * Description: | |
1044 | * Perform a label mapping to translate a local MLS category bitmap to the | |
1045 | * correct CIPSO category list using the given DOI definition. Returns the | |
1046 | * size in bytes of the network category bitmap on success, negative values | |
1047 | * otherwise. | |
1048 | * | |
1049 | */ | |
1050 | static int cipso_v4_map_cat_rng_hton(const struct cipso_v4_doi *doi_def, | |
1051 | const struct netlbl_lsm_secattr *secattr, | |
1052 | unsigned char *net_cat, | |
1053 | u32 net_cat_len) | |
1054 | { | |
484b3669 | 1055 | int iter = -1; |
f998e8cb | 1056 | u16 array[CIPSO_V4_TAG_RNG_CAT_MAX * 2]; |
484b3669 PM |
1057 | u32 array_cnt = 0; |
1058 | u32 cat_size = 0; | |
1059 | ||
f998e8cb | 1060 | /* make sure we don't overflow the 'array[]' variable */ |
128c6b6c PM |
1061 | if (net_cat_len > |
1062 | (CIPSO_V4_OPT_LEN_MAX - CIPSO_V4_HDR_LEN - CIPSO_V4_TAG_RNG_BLEN)) | |
1063 | return -ENOSPC; | |
484b3669 PM |
1064 | |
1065 | for (;;) { | |
4fbe63d1 | 1066 | iter = netlbl_catmap_walk(secattr->attr.mls.cat, iter + 1); |
484b3669 PM |
1067 | if (iter < 0) |
1068 | break; | |
1069 | cat_size += (iter == 0 ? 0 : sizeof(u16)); | |
1070 | if (cat_size > net_cat_len) | |
1071 | return -ENOSPC; | |
1072 | array[array_cnt++] = iter; | |
1073 | ||
4fbe63d1 | 1074 | iter = netlbl_catmap_walkrng(secattr->attr.mls.cat, iter); |
484b3669 PM |
1075 | if (iter < 0) |
1076 | return -EFAULT; | |
1077 | cat_size += sizeof(u16); | |
1078 | if (cat_size > net_cat_len) | |
1079 | return -ENOSPC; | |
1080 | array[array_cnt++] = iter; | |
1081 | } | |
1082 | ||
1083 | for (iter = 0; array_cnt > 0;) { | |
1084 | *((__be16 *)&net_cat[iter]) = htons(array[--array_cnt]); | |
1085 | iter += 2; | |
1086 | array_cnt--; | |
1087 | if (array[array_cnt] != 0) { | |
1088 | *((__be16 *)&net_cat[iter]) = htons(array[array_cnt]); | |
1089 | iter += 2; | |
1090 | } | |
1091 | } | |
1092 | ||
1093 | return cat_size; | |
1094 | } | |
1095 | ||
1096 | /** | |
1097 | * cipso_v4_map_cat_rng_ntoh - Perform a category mapping from network to host | |
1098 | * @doi_def: the DOI definition | |
1099 | * @net_cat: the category list in network/CIPSO format | |
1100 | * @net_cat_len: the length of the CIPSO bitmap in bytes | |
1101 | * @secattr: the security attributes | |
1102 | * | |
1103 | * Description: | |
1104 | * Perform a label mapping to translate a CIPSO category list to the correct | |
1105 | * local MLS category bitmap using the given DOI definition. Returns zero on | |
1106 | * success, negative values on failure. | |
1107 | * | |
1108 | */ | |
1109 | static int cipso_v4_map_cat_rng_ntoh(const struct cipso_v4_doi *doi_def, | |
1110 | const unsigned char *net_cat, | |
1111 | u32 net_cat_len, | |
1112 | struct netlbl_lsm_secattr *secattr) | |
1113 | { | |
1114 | int ret_val; | |
1115 | u32 net_iter; | |
1116 | u16 cat_low; | |
1117 | u16 cat_high; | |
1118 | ||
132adf54 | 1119 | for (net_iter = 0; net_iter < net_cat_len; net_iter += 4) { |
d3e2ce3b | 1120 | cat_high = get_unaligned_be16(&net_cat[net_iter]); |
484b3669 | 1121 | if ((net_iter + 4) <= net_cat_len) |
d3e2ce3b | 1122 | cat_low = get_unaligned_be16(&net_cat[net_iter + 2]); |
484b3669 PM |
1123 | else |
1124 | cat_low = 0; | |
1125 | ||
4fbe63d1 PM |
1126 | ret_val = netlbl_catmap_setrng(&secattr->attr.mls.cat, |
1127 | cat_low, | |
1128 | cat_high, | |
1129 | GFP_ATOMIC); | |
484b3669 PM |
1130 | if (ret_val != 0) |
1131 | return ret_val; | |
1132 | } | |
1133 | ||
1134 | return 0; | |
1135 | } | |
1136 | ||
446fda4f PM |
1137 | /* |
1138 | * Protocol Handling Functions | |
1139 | */ | |
1140 | ||
446fda4f PM |
1141 | /** |
1142 | * cipso_v4_gentag_hdr - Generate a CIPSO option header | |
1143 | * @doi_def: the DOI definition | |
91b1ed0a | 1144 | * @len: the total tag length in bytes, not including this header |
446fda4f PM |
1145 | * @buf: the CIPSO option buffer |
1146 | * | |
1147 | * Description: | |
91b1ed0a | 1148 | * Write a CIPSO header into the beginning of @buffer. |
446fda4f PM |
1149 | * |
1150 | */ | |
91b1ed0a PM |
1151 | static void cipso_v4_gentag_hdr(const struct cipso_v4_doi *doi_def, |
1152 | unsigned char *buf, | |
1153 | u32 len) | |
446fda4f | 1154 | { |
446fda4f PM |
1155 | buf[0] = IPOPT_CIPSO; |
1156 | buf[1] = CIPSO_V4_HDR_LEN + len; | |
e233febd | 1157 | put_unaligned_be32(doi_def->doi, &buf[2]); |
446fda4f PM |
1158 | } |
1159 | ||
446fda4f PM |
1160 | /** |
1161 | * cipso_v4_gentag_rbm - Generate a CIPSO restricted bitmap tag (type #1) | |
1162 | * @doi_def: the DOI definition | |
1163 | * @secattr: the security attributes | |
1164 | * @buffer: the option buffer | |
1165 | * @buffer_len: length of buffer in bytes | |
1166 | * | |
1167 | * Description: | |
1168 | * Generate a CIPSO option using the restricted bitmap tag, tag type #1. The | |
1169 | * actual buffer length may be larger than the indicated size due to | |
91b1ed0a PM |
1170 | * translation between host and network category bitmaps. Returns the size of |
1171 | * the tag on success, negative values on failure. | |
446fda4f PM |
1172 | * |
1173 | */ | |
1174 | static int cipso_v4_gentag_rbm(const struct cipso_v4_doi *doi_def, | |
1175 | const struct netlbl_lsm_secattr *secattr, | |
91b1ed0a PM |
1176 | unsigned char *buffer, |
1177 | u32 buffer_len) | |
446fda4f | 1178 | { |
701a90ba | 1179 | int ret_val; |
91b1ed0a | 1180 | u32 tag_len; |
446fda4f PM |
1181 | u32 level; |
1182 | ||
701a90ba PM |
1183 | if ((secattr->flags & NETLBL_SECATTR_MLS_LVL) == 0) |
1184 | return -EPERM; | |
1185 | ||
16efd454 PM |
1186 | ret_val = cipso_v4_map_lvl_hton(doi_def, |
1187 | secattr->attr.mls.lvl, | |
1188 | &level); | |
91b1ed0a PM |
1189 | if (ret_val != 0) |
1190 | return ret_val; | |
446fda4f | 1191 | |
91b1ed0a | 1192 | if (secattr->flags & NETLBL_SECATTR_MLS_CAT) { |
446fda4f | 1193 | ret_val = cipso_v4_map_cat_rbm_hton(doi_def, |
02752760 | 1194 | secattr, |
91b1ed0a PM |
1195 | &buffer[4], |
1196 | buffer_len - 4); | |
446fda4f | 1197 | if (ret_val < 0) |
91b1ed0a | 1198 | return ret_val; |
446fda4f PM |
1199 | |
1200 | /* This will send packets using the "optimized" format when | |
25985edc | 1201 | * possible as specified in section 3.4.2.6 of the |
446fda4f | 1202 | * CIPSO draft. */ |
dd44f04b KI |
1203 | if (READ_ONCE(cipso_v4_rbm_optfmt) && ret_val > 0 && |
1204 | ret_val <= 10) | |
91b1ed0a | 1205 | tag_len = 14; |
701a90ba | 1206 | else |
91b1ed0a PM |
1207 | tag_len = 4 + ret_val; |
1208 | } else | |
1209 | tag_len = 4; | |
446fda4f | 1210 | |
15c45f7b | 1211 | buffer[0] = CIPSO_V4_TAG_RBITMAP; |
91b1ed0a PM |
1212 | buffer[1] = tag_len; |
1213 | buffer[3] = level; | |
446fda4f | 1214 | |
91b1ed0a | 1215 | return tag_len; |
446fda4f PM |
1216 | } |
1217 | ||
1218 | /** | |
1219 | * cipso_v4_parsetag_rbm - Parse a CIPSO restricted bitmap tag | |
1220 | * @doi_def: the DOI definition | |
1221 | * @tag: the CIPSO tag | |
1222 | * @secattr: the security attributes | |
1223 | * | |
1224 | * Description: | |
1225 | * Parse a CIPSO restricted bitmap tag (tag type #1) and return the security | |
1226 | * attributes in @secattr. Return zero on success, negatives values on | |
1227 | * failure. | |
1228 | * | |
1229 | */ | |
1230 | static int cipso_v4_parsetag_rbm(const struct cipso_v4_doi *doi_def, | |
1231 | const unsigned char *tag, | |
1232 | struct netlbl_lsm_secattr *secattr) | |
1233 | { | |
1234 | int ret_val; | |
1235 | u8 tag_len = tag[1]; | |
1236 | u32 level; | |
1237 | ||
1238 | ret_val = cipso_v4_map_lvl_ntoh(doi_def, tag[3], &level); | |
1239 | if (ret_val != 0) | |
1240 | return ret_val; | |
16efd454 | 1241 | secattr->attr.mls.lvl = level; |
701a90ba | 1242 | secattr->flags |= NETLBL_SECATTR_MLS_LVL; |
446fda4f PM |
1243 | |
1244 | if (tag_len > 4) { | |
446fda4f PM |
1245 | ret_val = cipso_v4_map_cat_rbm_ntoh(doi_def, |
1246 | &tag[4], | |
1247 | tag_len - 4, | |
02752760 PM |
1248 | secattr); |
1249 | if (ret_val != 0) { | |
4fbe63d1 | 1250 | netlbl_catmap_free(secattr->attr.mls.cat); |
446fda4f PM |
1251 | return ret_val; |
1252 | } | |
02752760 | 1253 | |
eead1c2e PA |
1254 | if (secattr->attr.mls.cat) |
1255 | secattr->flags |= NETLBL_SECATTR_MLS_CAT; | |
446fda4f PM |
1256 | } |
1257 | ||
1258 | return 0; | |
1259 | } | |
1260 | ||
654bbc2a PM |
1261 | /** |
1262 | * cipso_v4_gentag_enum - Generate a CIPSO enumerated tag (type #2) | |
1263 | * @doi_def: the DOI definition | |
1264 | * @secattr: the security attributes | |
1265 | * @buffer: the option buffer | |
1266 | * @buffer_len: length of buffer in bytes | |
1267 | * | |
1268 | * Description: | |
1269 | * Generate a CIPSO option using the enumerated tag, tag type #2. Returns the | |
1270 | * size of the tag on success, negative values on failure. | |
1271 | * | |
1272 | */ | |
1273 | static int cipso_v4_gentag_enum(const struct cipso_v4_doi *doi_def, | |
1274 | const struct netlbl_lsm_secattr *secattr, | |
1275 | unsigned char *buffer, | |
1276 | u32 buffer_len) | |
1277 | { | |
1278 | int ret_val; | |
1279 | u32 tag_len; | |
1280 | u32 level; | |
1281 | ||
1282 | if (!(secattr->flags & NETLBL_SECATTR_MLS_LVL)) | |
1283 | return -EPERM; | |
1284 | ||
16efd454 PM |
1285 | ret_val = cipso_v4_map_lvl_hton(doi_def, |
1286 | secattr->attr.mls.lvl, | |
1287 | &level); | |
654bbc2a PM |
1288 | if (ret_val != 0) |
1289 | return ret_val; | |
1290 | ||
1291 | if (secattr->flags & NETLBL_SECATTR_MLS_CAT) { | |
1292 | ret_val = cipso_v4_map_cat_enum_hton(doi_def, | |
1293 | secattr, | |
1294 | &buffer[4], | |
1295 | buffer_len - 4); | |
1296 | if (ret_val < 0) | |
1297 | return ret_val; | |
1298 | ||
1299 | tag_len = 4 + ret_val; | |
1300 | } else | |
1301 | tag_len = 4; | |
1302 | ||
15c45f7b | 1303 | buffer[0] = CIPSO_V4_TAG_ENUM; |
654bbc2a PM |
1304 | buffer[1] = tag_len; |
1305 | buffer[3] = level; | |
1306 | ||
1307 | return tag_len; | |
1308 | } | |
1309 | ||
1310 | /** | |
1311 | * cipso_v4_parsetag_enum - Parse a CIPSO enumerated tag | |
1312 | * @doi_def: the DOI definition | |
1313 | * @tag: the CIPSO tag | |
1314 | * @secattr: the security attributes | |
1315 | * | |
1316 | * Description: | |
1317 | * Parse a CIPSO enumerated tag (tag type #2) and return the security | |
1318 | * attributes in @secattr. Return zero on success, negatives values on | |
1319 | * failure. | |
1320 | * | |
1321 | */ | |
1322 | static int cipso_v4_parsetag_enum(const struct cipso_v4_doi *doi_def, | |
1323 | const unsigned char *tag, | |
1324 | struct netlbl_lsm_secattr *secattr) | |
1325 | { | |
1326 | int ret_val; | |
1327 | u8 tag_len = tag[1]; | |
1328 | u32 level; | |
1329 | ||
1330 | ret_val = cipso_v4_map_lvl_ntoh(doi_def, tag[3], &level); | |
1331 | if (ret_val != 0) | |
1332 | return ret_val; | |
16efd454 | 1333 | secattr->attr.mls.lvl = level; |
654bbc2a PM |
1334 | secattr->flags |= NETLBL_SECATTR_MLS_LVL; |
1335 | ||
1336 | if (tag_len > 4) { | |
654bbc2a PM |
1337 | ret_val = cipso_v4_map_cat_enum_ntoh(doi_def, |
1338 | &tag[4], | |
1339 | tag_len - 4, | |
1340 | secattr); | |
1341 | if (ret_val != 0) { | |
4fbe63d1 | 1342 | netlbl_catmap_free(secattr->attr.mls.cat); |
654bbc2a PM |
1343 | return ret_val; |
1344 | } | |
1345 | ||
1346 | secattr->flags |= NETLBL_SECATTR_MLS_CAT; | |
1347 | } | |
1348 | ||
1349 | return 0; | |
1350 | } | |
1351 | ||
484b3669 PM |
1352 | /** |
1353 | * cipso_v4_gentag_rng - Generate a CIPSO ranged tag (type #5) | |
1354 | * @doi_def: the DOI definition | |
1355 | * @secattr: the security attributes | |
1356 | * @buffer: the option buffer | |
1357 | * @buffer_len: length of buffer in bytes | |
1358 | * | |
1359 | * Description: | |
1360 | * Generate a CIPSO option using the ranged tag, tag type #5. Returns the | |
1361 | * size of the tag on success, negative values on failure. | |
1362 | * | |
1363 | */ | |
1364 | static int cipso_v4_gentag_rng(const struct cipso_v4_doi *doi_def, | |
1365 | const struct netlbl_lsm_secattr *secattr, | |
1366 | unsigned char *buffer, | |
1367 | u32 buffer_len) | |
1368 | { | |
1369 | int ret_val; | |
1370 | u32 tag_len; | |
1371 | u32 level; | |
1372 | ||
1373 | if (!(secattr->flags & NETLBL_SECATTR_MLS_LVL)) | |
1374 | return -EPERM; | |
1375 | ||
16efd454 PM |
1376 | ret_val = cipso_v4_map_lvl_hton(doi_def, |
1377 | secattr->attr.mls.lvl, | |
1378 | &level); | |
484b3669 PM |
1379 | if (ret_val != 0) |
1380 | return ret_val; | |
1381 | ||
1382 | if (secattr->flags & NETLBL_SECATTR_MLS_CAT) { | |
1383 | ret_val = cipso_v4_map_cat_rng_hton(doi_def, | |
1384 | secattr, | |
1385 | &buffer[4], | |
1386 | buffer_len - 4); | |
1387 | if (ret_val < 0) | |
1388 | return ret_val; | |
1389 | ||
1390 | tag_len = 4 + ret_val; | |
1391 | } else | |
1392 | tag_len = 4; | |
1393 | ||
15c45f7b | 1394 | buffer[0] = CIPSO_V4_TAG_RANGE; |
484b3669 PM |
1395 | buffer[1] = tag_len; |
1396 | buffer[3] = level; | |
1397 | ||
1398 | return tag_len; | |
1399 | } | |
1400 | ||
1401 | /** | |
1402 | * cipso_v4_parsetag_rng - Parse a CIPSO ranged tag | |
1403 | * @doi_def: the DOI definition | |
1404 | * @tag: the CIPSO tag | |
1405 | * @secattr: the security attributes | |
1406 | * | |
1407 | * Description: | |
1408 | * Parse a CIPSO ranged tag (tag type #5) and return the security attributes | |
1409 | * in @secattr. Return zero on success, negatives values on failure. | |
1410 | * | |
1411 | */ | |
1412 | static int cipso_v4_parsetag_rng(const struct cipso_v4_doi *doi_def, | |
1413 | const unsigned char *tag, | |
1414 | struct netlbl_lsm_secattr *secattr) | |
1415 | { | |
1416 | int ret_val; | |
1417 | u8 tag_len = tag[1]; | |
1418 | u32 level; | |
1419 | ||
1420 | ret_val = cipso_v4_map_lvl_ntoh(doi_def, tag[3], &level); | |
1421 | if (ret_val != 0) | |
1422 | return ret_val; | |
16efd454 | 1423 | secattr->attr.mls.lvl = level; |
484b3669 PM |
1424 | secattr->flags |= NETLBL_SECATTR_MLS_LVL; |
1425 | ||
1426 | if (tag_len > 4) { | |
484b3669 PM |
1427 | ret_val = cipso_v4_map_cat_rng_ntoh(doi_def, |
1428 | &tag[4], | |
1429 | tag_len - 4, | |
1430 | secattr); | |
1431 | if (ret_val != 0) { | |
4fbe63d1 | 1432 | netlbl_catmap_free(secattr->attr.mls.cat); |
484b3669 PM |
1433 | return ret_val; |
1434 | } | |
1435 | ||
eead1c2e PA |
1436 | if (secattr->attr.mls.cat) |
1437 | secattr->flags |= NETLBL_SECATTR_MLS_CAT; | |
484b3669 PM |
1438 | } |
1439 | ||
1440 | return 0; | |
1441 | } | |
1442 | ||
15c45f7b PM |
1443 | /** |
1444 | * cipso_v4_gentag_loc - Generate a CIPSO local tag (non-standard) | |
1445 | * @doi_def: the DOI definition | |
1446 | * @secattr: the security attributes | |
1447 | * @buffer: the option buffer | |
1448 | * @buffer_len: length of buffer in bytes | |
1449 | * | |
1450 | * Description: | |
1451 | * Generate a CIPSO option using the local tag. Returns the size of the tag | |
1452 | * on success, negative values on failure. | |
1453 | * | |
1454 | */ | |
1455 | static int cipso_v4_gentag_loc(const struct cipso_v4_doi *doi_def, | |
1456 | const struct netlbl_lsm_secattr *secattr, | |
1457 | unsigned char *buffer, | |
1458 | u32 buffer_len) | |
1459 | { | |
1460 | if (!(secattr->flags & NETLBL_SECATTR_SECID)) | |
1461 | return -EPERM; | |
1462 | ||
1463 | buffer[0] = CIPSO_V4_TAG_LOCAL; | |
1464 | buffer[1] = CIPSO_V4_TAG_LOC_BLEN; | |
1465 | *(u32 *)&buffer[2] = secattr->attr.secid; | |
1466 | ||
1467 | return CIPSO_V4_TAG_LOC_BLEN; | |
1468 | } | |
1469 | ||
1470 | /** | |
1471 | * cipso_v4_parsetag_loc - Parse a CIPSO local tag | |
1472 | * @doi_def: the DOI definition | |
1473 | * @tag: the CIPSO tag | |
1474 | * @secattr: the security attributes | |
1475 | * | |
1476 | * Description: | |
1477 | * Parse a CIPSO local tag and return the security attributes in @secattr. | |
1478 | * Return zero on success, negatives values on failure. | |
1479 | * | |
1480 | */ | |
1481 | static int cipso_v4_parsetag_loc(const struct cipso_v4_doi *doi_def, | |
1482 | const unsigned char *tag, | |
1483 | struct netlbl_lsm_secattr *secattr) | |
1484 | { | |
1485 | secattr->attr.secid = *(u32 *)&tag[2]; | |
1486 | secattr->flags |= NETLBL_SECATTR_SECID; | |
1487 | ||
1488 | return 0; | |
1489 | } | |
1490 | ||
04f81f01 PM |
1491 | /** |
1492 | * cipso_v4_optptr - Find the CIPSO option in the packet | |
1493 | * @skb: the packet | |
1494 | * | |
1495 | * Description: | |
1496 | * Parse the packet's IP header looking for a CIPSO option. Returns a pointer | |
076ed3da | 1497 | * to the start of the CIPSO option on success, NULL if one is not found. |
04f81f01 PM |
1498 | * |
1499 | */ | |
1500 | unsigned char *cipso_v4_optptr(const struct sk_buff *skb) | |
1501 | { | |
1502 | const struct iphdr *iph = ip_hdr(skb); | |
1503 | unsigned char *optptr = (unsigned char *)&(ip_hdr(skb)[1]); | |
1504 | int optlen; | |
1505 | int taglen; | |
1506 | ||
076ed3da | 1507 | for (optlen = iph->ihl*4 - sizeof(struct iphdr); optlen > 1; ) { |
40413955 | 1508 | switch (optptr[0]) { |
40413955 | 1509 | case IPOPT_END: |
1510 | return NULL; | |
1511 | case IPOPT_NOOP: | |
1512 | taglen = 1; | |
1513 | break; | |
1514 | default: | |
1515 | taglen = optptr[1]; | |
1516 | } | |
076ed3da SN |
1517 | if (!taglen || taglen > optlen) |
1518 | return NULL; | |
1519 | if (optptr[0] == IPOPT_CIPSO) | |
1520 | return optptr; | |
1521 | ||
04f81f01 PM |
1522 | optlen -= taglen; |
1523 | optptr += taglen; | |
1524 | } | |
1525 | ||
1526 | return NULL; | |
1527 | } | |
1528 | ||
446fda4f PM |
1529 | /** |
1530 | * cipso_v4_validate - Validate a CIPSO option | |
3628e3cb | 1531 | * @skb: the packet |
446fda4f PM |
1532 | * @option: the start of the option, on error it is set to point to the error |
1533 | * | |
1534 | * Description: | |
1535 | * This routine is called to validate a CIPSO option, it checks all of the | |
1536 | * fields to ensure that they are at least valid, see the draft snippet below | |
1537 | * for details. If the option is valid then a zero value is returned and | |
1538 | * the value of @option is unchanged. If the option is invalid then a | |
1539 | * non-zero value is returned and @option is adjusted to point to the | |
1540 | * offending portion of the option. From the IETF draft ... | |
1541 | * | |
1542 | * "If any field within the CIPSO options, such as the DOI identifier, is not | |
1543 | * recognized the IP datagram is discarded and an ICMP 'parameter problem' | |
1544 | * (type 12) is generated and returned. The ICMP code field is set to 'bad | |
1545 | * parameter' (code 0) and the pointer is set to the start of the CIPSO field | |
1546 | * that is unrecognized." | |
1547 | * | |
1548 | */ | |
15c45f7b | 1549 | int cipso_v4_validate(const struct sk_buff *skb, unsigned char **option) |
446fda4f PM |
1550 | { |
1551 | unsigned char *opt = *option; | |
1552 | unsigned char *tag; | |
1553 | unsigned char opt_iter; | |
1554 | unsigned char err_offset = 0; | |
1555 | u8 opt_len; | |
1556 | u8 tag_len; | |
1557 | struct cipso_v4_doi *doi_def = NULL; | |
1558 | u32 tag_iter; | |
1559 | ||
1560 | /* caller already checks for length values that are too large */ | |
1561 | opt_len = opt[1]; | |
1562 | if (opt_len < 8) { | |
1563 | err_offset = 1; | |
1564 | goto validate_return; | |
1565 | } | |
1566 | ||
1567 | rcu_read_lock(); | |
d3e2ce3b | 1568 | doi_def = cipso_v4_doi_search(get_unaligned_be32(&opt[2])); |
51456b29 | 1569 | if (!doi_def) { |
446fda4f PM |
1570 | err_offset = 2; |
1571 | goto validate_return_locked; | |
1572 | } | |
1573 | ||
15c45f7b | 1574 | opt_iter = CIPSO_V4_HDR_LEN; |
446fda4f PM |
1575 | tag = opt + opt_iter; |
1576 | while (opt_iter < opt_len) { | |
1577 | for (tag_iter = 0; doi_def->tags[tag_iter] != tag[0];) | |
1578 | if (doi_def->tags[tag_iter] == CIPSO_V4_TAG_INVALID || | |
1579 | ++tag_iter == CIPSO_V4_TAG_MAXCNT) { | |
1580 | err_offset = opt_iter; | |
1581 | goto validate_return_locked; | |
1582 | } | |
1583 | ||
d71b7896 ED |
1584 | if (opt_iter + 1 == opt_len) { |
1585 | err_offset = opt_iter; | |
1586 | goto validate_return_locked; | |
1587 | } | |
446fda4f PM |
1588 | tag_len = tag[1]; |
1589 | if (tag_len > (opt_len - opt_iter)) { | |
1590 | err_offset = opt_iter + 1; | |
1591 | goto validate_return_locked; | |
1592 | } | |
1593 | ||
1594 | switch (tag[0]) { | |
1595 | case CIPSO_V4_TAG_RBITMAP: | |
15c45f7b | 1596 | if (tag_len < CIPSO_V4_TAG_RBM_BLEN) { |
446fda4f PM |
1597 | err_offset = opt_iter + 1; |
1598 | goto validate_return_locked; | |
1599 | } | |
1600 | ||
1601 | /* We are already going to do all the verification | |
1602 | * necessary at the socket layer so from our point of | |
1603 | * view it is safe to turn these checks off (and less | |
1604 | * work), however, the CIPSO draft says we should do | |
1605 | * all the CIPSO validations here but it doesn't | |
1606 | * really specify _exactly_ what we need to validate | |
1607 | * ... so, just make it a sysctl tunable. */ | |
dd44f04b | 1608 | if (READ_ONCE(cipso_v4_rbm_strictvalid)) { |
446fda4f PM |
1609 | if (cipso_v4_map_lvl_valid(doi_def, |
1610 | tag[3]) < 0) { | |
1611 | err_offset = opt_iter + 3; | |
1612 | goto validate_return_locked; | |
1613 | } | |
15c45f7b | 1614 | if (tag_len > CIPSO_V4_TAG_RBM_BLEN && |
446fda4f PM |
1615 | cipso_v4_map_cat_rbm_valid(doi_def, |
1616 | &tag[4], | |
1617 | tag_len - 4) < 0) { | |
1618 | err_offset = opt_iter + 4; | |
1619 | goto validate_return_locked; | |
1620 | } | |
1621 | } | |
1622 | break; | |
654bbc2a | 1623 | case CIPSO_V4_TAG_ENUM: |
15c45f7b | 1624 | if (tag_len < CIPSO_V4_TAG_ENUM_BLEN) { |
654bbc2a PM |
1625 | err_offset = opt_iter + 1; |
1626 | goto validate_return_locked; | |
1627 | } | |
1628 | ||
1629 | if (cipso_v4_map_lvl_valid(doi_def, | |
1630 | tag[3]) < 0) { | |
1631 | err_offset = opt_iter + 3; | |
1632 | goto validate_return_locked; | |
1633 | } | |
15c45f7b | 1634 | if (tag_len > CIPSO_V4_TAG_ENUM_BLEN && |
654bbc2a PM |
1635 | cipso_v4_map_cat_enum_valid(doi_def, |
1636 | &tag[4], | |
1637 | tag_len - 4) < 0) { | |
1638 | err_offset = opt_iter + 4; | |
1639 | goto validate_return_locked; | |
1640 | } | |
1641 | break; | |
484b3669 | 1642 | case CIPSO_V4_TAG_RANGE: |
15c45f7b | 1643 | if (tag_len < CIPSO_V4_TAG_RNG_BLEN) { |
484b3669 PM |
1644 | err_offset = opt_iter + 1; |
1645 | goto validate_return_locked; | |
1646 | } | |
1647 | ||
1648 | if (cipso_v4_map_lvl_valid(doi_def, | |
1649 | tag[3]) < 0) { | |
1650 | err_offset = opt_iter + 3; | |
1651 | goto validate_return_locked; | |
1652 | } | |
15c45f7b | 1653 | if (tag_len > CIPSO_V4_TAG_RNG_BLEN && |
484b3669 PM |
1654 | cipso_v4_map_cat_rng_valid(doi_def, |
1655 | &tag[4], | |
1656 | tag_len - 4) < 0) { | |
1657 | err_offset = opt_iter + 4; | |
1658 | goto validate_return_locked; | |
1659 | } | |
1660 | break; | |
15c45f7b PM |
1661 | case CIPSO_V4_TAG_LOCAL: |
1662 | /* This is a non-standard tag that we only allow for | |
1663 | * local connections, so if the incoming interface is | |
89d7ae34 PM |
1664 | * not the loopback device drop the packet. Further, |
1665 | * there is no legitimate reason for setting this from | |
1666 | * userspace so reject it if skb is NULL. */ | |
51456b29 | 1667 | if (!skb || !(skb->dev->flags & IFF_LOOPBACK)) { |
15c45f7b PM |
1668 | err_offset = opt_iter; |
1669 | goto validate_return_locked; | |
1670 | } | |
1671 | if (tag_len != CIPSO_V4_TAG_LOC_BLEN) { | |
1672 | err_offset = opt_iter + 1; | |
1673 | goto validate_return_locked; | |
1674 | } | |
1675 | break; | |
446fda4f PM |
1676 | default: |
1677 | err_offset = opt_iter; | |
1678 | goto validate_return_locked; | |
1679 | } | |
1680 | ||
1681 | tag += tag_len; | |
1682 | opt_iter += tag_len; | |
1683 | } | |
1684 | ||
1685 | validate_return_locked: | |
1686 | rcu_read_unlock(); | |
1687 | validate_return: | |
1688 | *option = opt + err_offset; | |
1689 | return err_offset; | |
1690 | } | |
1691 | ||
1692 | /** | |
25985edc | 1693 | * cipso_v4_error - Send the correct response for a bad packet |
446fda4f PM |
1694 | * @skb: the packet |
1695 | * @error: the error code | |
1696 | * @gateway: CIPSO gateway flag | |
1697 | * | |
1698 | * Description: | |
1699 | * Based on the error code given in @error, send an ICMP error message back to | |
1700 | * the originating host. From the IETF draft ... | |
1701 | * | |
1702 | * "If the contents of the CIPSO [option] are valid but the security label is | |
1703 | * outside of the configured host or port label range, the datagram is | |
1704 | * discarded and an ICMP 'destination unreachable' (type 3) is generated and | |
1705 | * returned. The code field of the ICMP is set to 'communication with | |
1706 | * destination network administratively prohibited' (code 9) or to | |
1707 | * 'communication with destination host administratively prohibited' | |
1708 | * (code 10). The value of the code is dependent on whether the originator | |
1709 | * of the ICMP message is acting as a CIPSO host or a CIPSO gateway. The | |
1710 | * recipient of the ICMP message MUST be able to handle either value. The | |
1711 | * same procedure is performed if a CIPSO [option] can not be added to an | |
1712 | * IP packet because it is too large to fit in the IP options area." | |
1713 | * | |
1714 | * "If the error is triggered by receipt of an ICMP message, the message is | |
1715 | * discarded and no response is permitted (consistent with general ICMP | |
1716 | * processing rules)." | |
1717 | * | |
1718 | */ | |
1719 | void cipso_v4_error(struct sk_buff *skb, int error, u32 gateway) | |
1720 | { | |
3da1ed7a NS |
1721 | unsigned char optbuf[sizeof(struct ip_options) + 40]; |
1722 | struct ip_options *opt = (struct ip_options *)optbuf; | |
3e72dfdf | 1723 | int res; |
3da1ed7a | 1724 | |
eddc9ec5 | 1725 | if (ip_hdr(skb)->protocol == IPPROTO_ICMP || error != -EACCES) |
446fda4f PM |
1726 | return; |
1727 | ||
3da1ed7a NS |
1728 | /* |
1729 | * We might be called above the IP layer, | |
1730 | * so we can not use icmp_send and IPCB here. | |
1731 | */ | |
1732 | ||
1733 | memset(opt, 0, sizeof(struct ip_options)); | |
1734 | opt->optlen = ip_hdr(skb)->ihl*4 - sizeof(struct iphdr); | |
3e72dfdf MC |
1735 | rcu_read_lock(); |
1736 | res = __ip_options_compile(dev_net(skb->dev), opt, skb, NULL); | |
1737 | rcu_read_unlock(); | |
1738 | ||
1739 | if (res) | |
3da1ed7a NS |
1740 | return; |
1741 | ||
446fda4f | 1742 | if (gateway) |
3da1ed7a | 1743 | __icmp_send(skb, ICMP_DEST_UNREACH, ICMP_NET_ANO, 0, opt); |
446fda4f | 1744 | else |
3da1ed7a | 1745 | __icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_ANO, 0, opt); |
446fda4f PM |
1746 | } |
1747 | ||
1748 | /** | |
948bf85c PM |
1749 | * cipso_v4_genopt - Generate a CIPSO option |
1750 | * @buf: the option buffer | |
1751 | * @buf_len: the size of opt_buf | |
446fda4f | 1752 | * @doi_def: the CIPSO DOI to use |
948bf85c | 1753 | * @secattr: the security attributes |
446fda4f PM |
1754 | * |
1755 | * Description: | |
948bf85c PM |
1756 | * Generate a CIPSO option using the DOI definition and security attributes |
1757 | * passed to the function. Returns the length of the option on success and | |
1758 | * negative values on failure. | |
446fda4f PM |
1759 | * |
1760 | */ | |
948bf85c PM |
1761 | static int cipso_v4_genopt(unsigned char *buf, u32 buf_len, |
1762 | const struct cipso_v4_doi *doi_def, | |
1763 | const struct netlbl_lsm_secattr *secattr) | |
446fda4f | 1764 | { |
948bf85c | 1765 | int ret_val; |
446fda4f | 1766 | u32 iter; |
446fda4f | 1767 | |
948bf85c PM |
1768 | if (buf_len <= CIPSO_V4_HDR_LEN) |
1769 | return -ENOSPC; | |
91b1ed0a | 1770 | |
446fda4f PM |
1771 | /* XXX - This code assumes only one tag per CIPSO option which isn't |
1772 | * really a good assumption to make but since we only support the MAC | |
1773 | * tags right now it is a safe assumption. */ | |
1774 | iter = 0; | |
1775 | do { | |
91b1ed0a | 1776 | memset(buf, 0, buf_len); |
446fda4f PM |
1777 | switch (doi_def->tags[iter]) { |
1778 | case CIPSO_V4_TAG_RBITMAP: | |
1779 | ret_val = cipso_v4_gentag_rbm(doi_def, | |
91b1ed0a PM |
1780 | secattr, |
1781 | &buf[CIPSO_V4_HDR_LEN], | |
1782 | buf_len - CIPSO_V4_HDR_LEN); | |
446fda4f | 1783 | break; |
654bbc2a PM |
1784 | case CIPSO_V4_TAG_ENUM: |
1785 | ret_val = cipso_v4_gentag_enum(doi_def, | |
1786 | secattr, | |
1787 | &buf[CIPSO_V4_HDR_LEN], | |
1788 | buf_len - CIPSO_V4_HDR_LEN); | |
1789 | break; | |
484b3669 PM |
1790 | case CIPSO_V4_TAG_RANGE: |
1791 | ret_val = cipso_v4_gentag_rng(doi_def, | |
1792 | secattr, | |
1793 | &buf[CIPSO_V4_HDR_LEN], | |
1794 | buf_len - CIPSO_V4_HDR_LEN); | |
1795 | break; | |
15c45f7b PM |
1796 | case CIPSO_V4_TAG_LOCAL: |
1797 | ret_val = cipso_v4_gentag_loc(doi_def, | |
1798 | secattr, | |
1799 | &buf[CIPSO_V4_HDR_LEN], | |
1800 | buf_len - CIPSO_V4_HDR_LEN); | |
1801 | break; | |
446fda4f | 1802 | default: |
948bf85c | 1803 | return -EPERM; |
446fda4f PM |
1804 | } |
1805 | ||
1806 | iter++; | |
91b1ed0a | 1807 | } while (ret_val < 0 && |
446fda4f PM |
1808 | iter < CIPSO_V4_TAG_MAXCNT && |
1809 | doi_def->tags[iter] != CIPSO_V4_TAG_INVALID); | |
91b1ed0a | 1810 | if (ret_val < 0) |
948bf85c | 1811 | return ret_val; |
91b1ed0a | 1812 | cipso_v4_gentag_hdr(doi_def, buf, ret_val); |
948bf85c PM |
1813 | return CIPSO_V4_HDR_LEN + ret_val; |
1814 | } | |
1815 | ||
1816 | /** | |
1817 | * cipso_v4_sock_setattr - Add a CIPSO option to a socket | |
1818 | * @sk: the socket | |
1819 | * @doi_def: the CIPSO DOI to use | |
1820 | * @secattr: the specific security attributes of the socket | |
1821 | * | |
1822 | * Description: | |
1823 | * Set the CIPSO option on the given socket using the DOI definition and | |
1824 | * security attributes passed to the function. This function requires | |
1825 | * exclusive access to @sk, which means it either needs to be in the | |
1826 | * process of being created or locked. Returns zero on success and negative | |
1827 | * values on failure. | |
1828 | * | |
1829 | */ | |
1830 | int cipso_v4_sock_setattr(struct sock *sk, | |
1831 | const struct cipso_v4_doi *doi_def, | |
1832 | const struct netlbl_lsm_secattr *secattr) | |
1833 | { | |
1834 | int ret_val = -EPERM; | |
1835 | unsigned char *buf = NULL; | |
1836 | u32 buf_len; | |
1837 | u32 opt_len; | |
f6d8bd05 | 1838 | struct ip_options_rcu *old, *opt = NULL; |
948bf85c PM |
1839 | struct inet_sock *sk_inet; |
1840 | struct inet_connection_sock *sk_conn; | |
1841 | ||
1842 | /* In the case of sock_create_lite(), the sock->sk field is not | |
1843 | * defined yet but it is not a problem as the only users of these | |
1844 | * "lite" PF_INET sockets are functions which do an accept() call | |
1845 | * afterwards so we will label the socket as part of the accept(). */ | |
51456b29 | 1846 | if (!sk) |
948bf85c PM |
1847 | return 0; |
1848 | ||
1849 | /* We allocate the maximum CIPSO option size here so we are probably | |
1850 | * being a little wasteful, but it makes our life _much_ easier later | |
1851 | * on and after all we are only talking about 40 bytes. */ | |
1852 | buf_len = CIPSO_V4_OPT_LEN_MAX; | |
1853 | buf = kmalloc(buf_len, GFP_ATOMIC); | |
51456b29 | 1854 | if (!buf) { |
948bf85c PM |
1855 | ret_val = -ENOMEM; |
1856 | goto socket_setattr_failure; | |
1857 | } | |
1858 | ||
1859 | ret_val = cipso_v4_genopt(buf, buf_len, doi_def, secattr); | |
1860 | if (ret_val < 0) | |
1861 | goto socket_setattr_failure; | |
1862 | buf_len = ret_val; | |
446fda4f PM |
1863 | |
1864 | /* We can't use ip_options_get() directly because it makes a call to | |
1865 | * ip_options_get_alloc() which allocates memory with GFP_KERNEL and | |
f8687afe PM |
1866 | * we won't always have CAP_NET_RAW even though we _always_ want to |
1867 | * set the IPOPT_CIPSO option. */ | |
446fda4f PM |
1868 | opt_len = (buf_len + 3) & ~3; |
1869 | opt = kzalloc(sizeof(*opt) + opt_len, GFP_ATOMIC); | |
51456b29 | 1870 | if (!opt) { |
446fda4f PM |
1871 | ret_val = -ENOMEM; |
1872 | goto socket_setattr_failure; | |
1873 | } | |
f6d8bd05 ED |
1874 | memcpy(opt->opt.__data, buf, buf_len); |
1875 | opt->opt.optlen = opt_len; | |
1876 | opt->opt.cipso = sizeof(struct iphdr); | |
446fda4f PM |
1877 | kfree(buf); |
1878 | buf = NULL; | |
446fda4f PM |
1879 | |
1880 | sk_inet = inet_sk(sk); | |
f6d8bd05 | 1881 | |
1e1d04e6 HFS |
1882 | old = rcu_dereference_protected(sk_inet->inet_opt, |
1883 | lockdep_sock_is_held(sk)); | |
446fda4f PM |
1884 | if (sk_inet->is_icsk) { |
1885 | sk_conn = inet_csk(sk); | |
f6d8bd05 ED |
1886 | if (old) |
1887 | sk_conn->icsk_ext_hdr_len -= old->opt.optlen; | |
1888 | sk_conn->icsk_ext_hdr_len += opt->opt.optlen; | |
446fda4f PM |
1889 | sk_conn->icsk_sync_mss(sk, sk_conn->icsk_pmtu_cookie); |
1890 | } | |
f6d8bd05 ED |
1891 | rcu_assign_pointer(sk_inet->inet_opt, opt); |
1892 | if (old) | |
4f9c8c1b | 1893 | kfree_rcu(old, rcu); |
446fda4f PM |
1894 | |
1895 | return 0; | |
1896 | ||
1897 | socket_setattr_failure: | |
1898 | kfree(buf); | |
1899 | kfree(opt); | |
1900 | return ret_val; | |
1901 | } | |
1902 | ||
014ab19a | 1903 | /** |
389fb800 PM |
1904 | * cipso_v4_req_setattr - Add a CIPSO option to a connection request socket |
1905 | * @req: the connection request socket | |
1906 | * @doi_def: the CIPSO DOI to use | |
1907 | * @secattr: the specific security attributes of the socket | |
014ab19a PM |
1908 | * |
1909 | * Description: | |
389fb800 PM |
1910 | * Set the CIPSO option on the given socket using the DOI definition and |
1911 | * security attributes passed to the function. Returns zero on success and | |
1912 | * negative values on failure. | |
014ab19a PM |
1913 | * |
1914 | */ | |
389fb800 PM |
1915 | int cipso_v4_req_setattr(struct request_sock *req, |
1916 | const struct cipso_v4_doi *doi_def, | |
1917 | const struct netlbl_lsm_secattr *secattr) | |
014ab19a | 1918 | { |
389fb800 PM |
1919 | int ret_val = -EPERM; |
1920 | unsigned char *buf = NULL; | |
1921 | u32 buf_len; | |
1922 | u32 opt_len; | |
f6d8bd05 | 1923 | struct ip_options_rcu *opt = NULL; |
389fb800 | 1924 | struct inet_request_sock *req_inet; |
014ab19a | 1925 | |
389fb800 PM |
1926 | /* We allocate the maximum CIPSO option size here so we are probably |
1927 | * being a little wasteful, but it makes our life _much_ easier later | |
1928 | * on and after all we are only talking about 40 bytes. */ | |
1929 | buf_len = CIPSO_V4_OPT_LEN_MAX; | |
1930 | buf = kmalloc(buf_len, GFP_ATOMIC); | |
51456b29 | 1931 | if (!buf) { |
389fb800 PM |
1932 | ret_val = -ENOMEM; |
1933 | goto req_setattr_failure; | |
1934 | } | |
1935 | ||
1936 | ret_val = cipso_v4_genopt(buf, buf_len, doi_def, secattr); | |
1937 | if (ret_val < 0) | |
1938 | goto req_setattr_failure; | |
1939 | buf_len = ret_val; | |
1940 | ||
1941 | /* We can't use ip_options_get() directly because it makes a call to | |
1942 | * ip_options_get_alloc() which allocates memory with GFP_KERNEL and | |
1943 | * we won't always have CAP_NET_RAW even though we _always_ want to | |
1944 | * set the IPOPT_CIPSO option. */ | |
1945 | opt_len = (buf_len + 3) & ~3; | |
1946 | opt = kzalloc(sizeof(*opt) + opt_len, GFP_ATOMIC); | |
51456b29 | 1947 | if (!opt) { |
389fb800 PM |
1948 | ret_val = -ENOMEM; |
1949 | goto req_setattr_failure; | |
1950 | } | |
f6d8bd05 ED |
1951 | memcpy(opt->opt.__data, buf, buf_len); |
1952 | opt->opt.optlen = opt_len; | |
1953 | opt->opt.cipso = sizeof(struct iphdr); | |
389fb800 PM |
1954 | kfree(buf); |
1955 | buf = NULL; | |
1956 | ||
1957 | req_inet = inet_rsk(req); | |
c92e8c02 | 1958 | opt = xchg((__force struct ip_options_rcu **)&req_inet->ireq_opt, opt); |
f6d8bd05 | 1959 | if (opt) |
4f9c8c1b | 1960 | kfree_rcu(opt, rcu); |
389fb800 PM |
1961 | |
1962 | return 0; | |
1963 | ||
1964 | req_setattr_failure: | |
1965 | kfree(buf); | |
1966 | kfree(opt); | |
1967 | return ret_val; | |
1968 | } | |
1969 | ||
1970 | /** | |
1971 | * cipso_v4_delopt - Delete the CIPSO option from a set of IP options | |
1972 | * @opt_ptr: IP option pointer | |
1973 | * | |
1974 | * Description: | |
1975 | * Deletes the CIPSO IP option from a set of IP options and makes the necessary | |
1976 | * adjustments to the IP option structure. Returns zero on success, negative | |
1977 | * values on failure. | |
1978 | * | |
1979 | */ | |
c92e8c02 | 1980 | static int cipso_v4_delopt(struct ip_options_rcu __rcu **opt_ptr) |
389fb800 | 1981 | { |
c92e8c02 | 1982 | struct ip_options_rcu *opt = rcu_dereference_protected(*opt_ptr, 1); |
389fb800 | 1983 | int hdr_delta = 0; |
014ab19a | 1984 | |
c92e8c02 ED |
1985 | if (!opt || opt->opt.cipso == 0) |
1986 | return 0; | |
f6d8bd05 | 1987 | if (opt->opt.srr || opt->opt.rr || opt->opt.ts || opt->opt.router_alert) { |
014ab19a PM |
1988 | u8 cipso_len; |
1989 | u8 cipso_off; | |
1990 | unsigned char *cipso_ptr; | |
1991 | int iter; | |
1992 | int optlen_new; | |
1993 | ||
f6d8bd05 ED |
1994 | cipso_off = opt->opt.cipso - sizeof(struct iphdr); |
1995 | cipso_ptr = &opt->opt.__data[cipso_off]; | |
014ab19a PM |
1996 | cipso_len = cipso_ptr[1]; |
1997 | ||
f6d8bd05 ED |
1998 | if (opt->opt.srr > opt->opt.cipso) |
1999 | opt->opt.srr -= cipso_len; | |
2000 | if (opt->opt.rr > opt->opt.cipso) | |
2001 | opt->opt.rr -= cipso_len; | |
2002 | if (opt->opt.ts > opt->opt.cipso) | |
2003 | opt->opt.ts -= cipso_len; | |
2004 | if (opt->opt.router_alert > opt->opt.cipso) | |
2005 | opt->opt.router_alert -= cipso_len; | |
2006 | opt->opt.cipso = 0; | |
014ab19a PM |
2007 | |
2008 | memmove(cipso_ptr, cipso_ptr + cipso_len, | |
f6d8bd05 | 2009 | opt->opt.optlen - cipso_off - cipso_len); |
014ab19a PM |
2010 | |
2011 | /* determining the new total option length is tricky because of | |
2012 | * the padding necessary, the only thing i can think to do at | |
2013 | * this point is walk the options one-by-one, skipping the | |
2014 | * padding at the end to determine the actual option size and | |
2015 | * from there we can determine the new total option length */ | |
2016 | iter = 0; | |
2017 | optlen_new = 0; | |
f6d8bd05 ED |
2018 | while (iter < opt->opt.optlen) |
2019 | if (opt->opt.__data[iter] != IPOPT_NOP) { | |
2020 | iter += opt->opt.__data[iter + 1]; | |
014ab19a PM |
2021 | optlen_new = iter; |
2022 | } else | |
2023 | iter++; | |
f6d8bd05 ED |
2024 | hdr_delta = opt->opt.optlen; |
2025 | opt->opt.optlen = (optlen_new + 3) & ~3; | |
2026 | hdr_delta -= opt->opt.optlen; | |
014ab19a PM |
2027 | } else { |
2028 | /* only the cipso option was present on the socket so we can | |
2029 | * remove the entire option struct */ | |
389fb800 | 2030 | *opt_ptr = NULL; |
f6d8bd05 | 2031 | hdr_delta = opt->opt.optlen; |
4f9c8c1b | 2032 | kfree_rcu(opt, rcu); |
014ab19a PM |
2033 | } |
2034 | ||
389fb800 PM |
2035 | return hdr_delta; |
2036 | } | |
2037 | ||
2038 | /** | |
2039 | * cipso_v4_sock_delattr - Delete the CIPSO option from a socket | |
2040 | * @sk: the socket | |
2041 | * | |
2042 | * Description: | |
2043 | * Removes the CIPSO option from a socket, if present. | |
2044 | * | |
2045 | */ | |
2046 | void cipso_v4_sock_delattr(struct sock *sk) | |
2047 | { | |
389fb800 | 2048 | struct inet_sock *sk_inet; |
c92e8c02 | 2049 | int hdr_delta; |
389fb800 PM |
2050 | |
2051 | sk_inet = inet_sk(sk); | |
389fb800 | 2052 | |
f6d8bd05 | 2053 | hdr_delta = cipso_v4_delopt(&sk_inet->inet_opt); |
014ab19a PM |
2054 | if (sk_inet->is_icsk && hdr_delta > 0) { |
2055 | struct inet_connection_sock *sk_conn = inet_csk(sk); | |
2056 | sk_conn->icsk_ext_hdr_len -= hdr_delta; | |
2057 | sk_conn->icsk_sync_mss(sk, sk_conn->icsk_pmtu_cookie); | |
2058 | } | |
2059 | } | |
2060 | ||
389fb800 PM |
2061 | /** |
2062 | * cipso_v4_req_delattr - Delete the CIPSO option from a request socket | |
3628e3cb | 2063 | * @req: the request socket |
389fb800 PM |
2064 | * |
2065 | * Description: | |
2066 | * Removes the CIPSO option from a request socket, if present. | |
2067 | * | |
2068 | */ | |
2069 | void cipso_v4_req_delattr(struct request_sock *req) | |
2070 | { | |
c92e8c02 | 2071 | cipso_v4_delopt(&inet_rsk(req)->ireq_opt); |
389fb800 PM |
2072 | } |
2073 | ||
446fda4f | 2074 | /** |
63d804ea PM |
2075 | * cipso_v4_getattr - Helper function for the cipso_v4_*_getattr functions |
2076 | * @cipso: the CIPSO v4 option | |
446fda4f PM |
2077 | * @secattr: the security attributes |
2078 | * | |
2079 | * Description: | |
63d804ea PM |
2080 | * Inspect @cipso and return the security attributes in @secattr. Returns zero |
2081 | * on success and negative values on failure. | |
446fda4f PM |
2082 | * |
2083 | */ | |
04f81f01 PM |
2084 | int cipso_v4_getattr(const unsigned char *cipso, |
2085 | struct netlbl_lsm_secattr *secattr) | |
446fda4f PM |
2086 | { |
2087 | int ret_val = -ENOMSG; | |
446fda4f PM |
2088 | u32 doi; |
2089 | struct cipso_v4_doi *doi_def; | |
2090 | ||
63d804ea PM |
2091 | if (cipso_v4_cache_check(cipso, cipso[1], secattr) == 0) |
2092 | return 0; | |
446fda4f | 2093 | |
d3e2ce3b | 2094 | doi = get_unaligned_be32(&cipso[2]); |
446fda4f | 2095 | rcu_read_lock(); |
9bb5fd2b | 2096 | doi_def = cipso_v4_doi_search(doi); |
51456b29 | 2097 | if (!doi_def) |
63d804ea | 2098 | goto getattr_return; |
91b1ed0a PM |
2099 | /* XXX - This code assumes only one tag per CIPSO option which isn't |
2100 | * really a good assumption to make but since we only support the MAC | |
2101 | * tags right now it is a safe assumption. */ | |
63d804ea | 2102 | switch (cipso[6]) { |
446fda4f | 2103 | case CIPSO_V4_TAG_RBITMAP: |
63d804ea | 2104 | ret_val = cipso_v4_parsetag_rbm(doi_def, &cipso[6], secattr); |
446fda4f | 2105 | break; |
654bbc2a | 2106 | case CIPSO_V4_TAG_ENUM: |
63d804ea | 2107 | ret_val = cipso_v4_parsetag_enum(doi_def, &cipso[6], secattr); |
654bbc2a | 2108 | break; |
484b3669 | 2109 | case CIPSO_V4_TAG_RANGE: |
63d804ea | 2110 | ret_val = cipso_v4_parsetag_rng(doi_def, &cipso[6], secattr); |
484b3669 | 2111 | break; |
15c45f7b PM |
2112 | case CIPSO_V4_TAG_LOCAL: |
2113 | ret_val = cipso_v4_parsetag_loc(doi_def, &cipso[6], secattr); | |
2114 | break; | |
446fda4f | 2115 | } |
16efd454 PM |
2116 | if (ret_val == 0) |
2117 | secattr->type = NETLBL_NLTYPE_CIPSOV4; | |
446fda4f | 2118 | |
63d804ea PM |
2119 | getattr_return: |
2120 | rcu_read_unlock(); | |
14a72f53 PM |
2121 | return ret_val; |
2122 | } | |
2123 | ||
63d804ea PM |
2124 | /** |
2125 | * cipso_v4_sock_getattr - Get the security attributes from a sock | |
2126 | * @sk: the sock | |
2127 | * @secattr: the security attributes | |
2128 | * | |
2129 | * Description: | |
2130 | * Query @sk to see if there is a CIPSO option attached to the sock and if | |
2131 | * there is return the CIPSO security attributes in @secattr. This function | |
2132 | * requires that @sk be locked, or privately held, but it does not do any | |
2133 | * locking itself. Returns zero on success and negative values on failure. | |
2134 | * | |
2135 | */ | |
2136 | int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr) | |
2137 | { | |
f6d8bd05 ED |
2138 | struct ip_options_rcu *opt; |
2139 | int res = -ENOMSG; | |
63d804ea | 2140 | |
f6d8bd05 ED |
2141 | rcu_read_lock(); |
2142 | opt = rcu_dereference(inet_sk(sk)->inet_opt); | |
2143 | if (opt && opt->opt.cipso) | |
2144 | res = cipso_v4_getattr(opt->opt.__data + | |
2145 | opt->opt.cipso - | |
2146 | sizeof(struct iphdr), | |
2147 | secattr); | |
2148 | rcu_read_unlock(); | |
2149 | return res; | |
63d804ea PM |
2150 | } |
2151 | ||
948bf85c PM |
2152 | /** |
2153 | * cipso_v4_skbuff_setattr - Set the CIPSO option on a packet | |
2154 | * @skb: the packet | |
3628e3cb | 2155 | * @doi_def: the DOI structure |
948bf85c PM |
2156 | * @secattr: the security attributes |
2157 | * | |
2158 | * Description: | |
2159 | * Set the CIPSO option on the given packet based on the security attributes. | |
2160 | * Returns a pointer to the IP header on success and NULL on failure. | |
2161 | * | |
2162 | */ | |
2163 | int cipso_v4_skbuff_setattr(struct sk_buff *skb, | |
2164 | const struct cipso_v4_doi *doi_def, | |
2165 | const struct netlbl_lsm_secattr *secattr) | |
2166 | { | |
2167 | int ret_val; | |
2168 | struct iphdr *iph; | |
2169 | struct ip_options *opt = &IPCB(skb)->opt; | |
2170 | unsigned char buf[CIPSO_V4_OPT_LEN_MAX]; | |
2171 | u32 buf_len = CIPSO_V4_OPT_LEN_MAX; | |
2172 | u32 opt_len; | |
2173 | int len_delta; | |
2174 | ||
00af5c69 | 2175 | ret_val = cipso_v4_genopt(buf, buf_len, doi_def, secattr); |
2176 | if (ret_val < 0) | |
2177 | return ret_val; | |
2178 | buf_len = ret_val; | |
948bf85c PM |
2179 | opt_len = (buf_len + 3) & ~3; |
2180 | ||
2181 | /* we overwrite any existing options to ensure that we have enough | |
2182 | * room for the CIPSO option, the reason is that we _need_ to guarantee | |
2183 | * that the security label is applied to the packet - we do the same | |
2184 | * thing when using the socket options and it hasn't caused a problem, | |
2185 | * if we need to we can always revisit this choice later */ | |
2186 | ||
2187 | len_delta = opt_len - opt->optlen; | |
2188 | /* if we don't ensure enough headroom we could panic on the skb_push() | |
2189 | * call below so make sure we have enough, we are also "mangling" the | |
2190 | * packet so we should probably do a copy-on-write call anyway */ | |
2191 | ret_val = skb_cow(skb, skb_headroom(skb) + len_delta); | |
2192 | if (ret_val < 0) | |
2193 | return ret_val; | |
2194 | ||
2195 | if (len_delta > 0) { | |
2196 | /* we assume that the header + opt->optlen have already been | |
2197 | * "pushed" in ip_options_build() or similar */ | |
2198 | iph = ip_hdr(skb); | |
2199 | skb_push(skb, len_delta); | |
2200 | memmove((char *)iph - len_delta, iph, iph->ihl << 2); | |
2201 | skb_reset_network_header(skb); | |
2202 | iph = ip_hdr(skb); | |
2203 | } else if (len_delta < 0) { | |
2204 | iph = ip_hdr(skb); | |
2205 | memset(iph + 1, IPOPT_NOP, opt->optlen); | |
2206 | } else | |
2207 | iph = ip_hdr(skb); | |
2208 | ||
2209 | if (opt->optlen > 0) | |
2210 | memset(opt, 0, sizeof(*opt)); | |
2211 | opt->optlen = opt_len; | |
2212 | opt->cipso = sizeof(struct iphdr); | |
2213 | opt->is_changed = 1; | |
2214 | ||
2215 | /* we have to do the following because we are being called from a | |
2216 | * netfilter hook which means the packet already has had the header | |
2217 | * fields populated and the checksum calculated - yes this means we | |
2218 | * are doing more work than needed but we do it to keep the core | |
2219 | * stack clean and tidy */ | |
2220 | memcpy(iph + 1, buf, buf_len); | |
2221 | if (opt_len > buf_len) | |
2222 | memset((char *)(iph + 1) + buf_len, 0, opt_len - buf_len); | |
2223 | if (len_delta != 0) { | |
2224 | iph->ihl = 5 + (opt_len >> 2); | |
7eb072be | 2225 | iph_set_totlen(iph, skb->len); |
948bf85c PM |
2226 | } |
2227 | ip_send_check(iph); | |
2228 | ||
2229 | return 0; | |
2230 | } | |
2231 | ||
2232 | /** | |
2233 | * cipso_v4_skbuff_delattr - Delete any CIPSO options from a packet | |
2234 | * @skb: the packet | |
2235 | * | |
2236 | * Description: | |
2237 | * Removes any and all CIPSO options from the given packet. Returns zero on | |
2238 | * success, negative values on failure. | |
2239 | * | |
2240 | */ | |
2241 | int cipso_v4_skbuff_delattr(struct sk_buff *skb) | |
2242 | { | |
2243 | int ret_val; | |
2244 | struct iphdr *iph; | |
2245 | struct ip_options *opt = &IPCB(skb)->opt; | |
2246 | unsigned char *cipso_ptr; | |
2247 | ||
2248 | if (opt->cipso == 0) | |
2249 | return 0; | |
2250 | ||
2251 | /* since we are changing the packet we should make a copy */ | |
2252 | ret_val = skb_cow(skb, skb_headroom(skb)); | |
2253 | if (ret_val < 0) | |
2254 | return ret_val; | |
2255 | ||
2256 | /* the easiest thing to do is just replace the cipso option with noop | |
2257 | * options since we don't change the size of the packet, although we | |
2258 | * still need to recalculate the checksum */ | |
2259 | ||
2260 | iph = ip_hdr(skb); | |
2261 | cipso_ptr = (unsigned char *)iph + opt->cipso; | |
2262 | memset(cipso_ptr, IPOPT_NOOP, cipso_ptr[1]); | |
2263 | opt->cipso = 0; | |
2264 | opt->is_changed = 1; | |
2265 | ||
2266 | ip_send_check(iph); | |
2267 | ||
2268 | return 0; | |
2269 | } | |
2270 | ||
446fda4f PM |
2271 | /* |
2272 | * Setup Functions | |
2273 | */ | |
2274 | ||
2275 | /** | |
2276 | * cipso_v4_init - Initialize the CIPSO module | |
2277 | * | |
2278 | * Description: | |
2279 | * Initialize the CIPSO module and prepare it for use. Returns zero on success | |
2280 | * and negative values on failure. | |
2281 | * | |
2282 | */ | |
2283 | static int __init cipso_v4_init(void) | |
2284 | { | |
2285 | int ret_val; | |
2286 | ||
2287 | ret_val = cipso_v4_cache_init(); | |
2288 | if (ret_val != 0) | |
2289 | panic("Failed to initialize the CIPSO/IPv4 cache (%d)\n", | |
2290 | ret_val); | |
2291 | ||
2292 | return 0; | |
2293 | } | |
2294 | ||
2295 | subsys_initcall(cipso_v4_init); |