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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * CALIPSO - Common Architecture Label IPv6 Security Option
4 *
5 * This is an implementation of the CALIPSO protocol as specified in
6 * RFC 5570.
7 *
8 * Authors: Paul Moore <paul.moore@hp.com>
9 * Huw Davies <huw@codeweavers.com>
10 */
11
12/* (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008
13 * (c) Copyright Huw Davies <huw@codeweavers.com>, 2015
14 */
15
16#include <linux/init.h>
17#include <linux/types.h>
18#include <linux/rcupdate.h>
19#include <linux/list.h>
20#include <linux/spinlock.h>
21#include <linux/string.h>
22#include <linux/jhash.h>
23#include <linux/audit.h>
24#include <linux/slab.h>
25#include <net/ip.h>
26#include <net/icmp.h>
27#include <net/tcp.h>
28#include <net/netlabel.h>
29#include <net/calipso.h>
30#include <linux/atomic.h>
31#include <linux/bug.h>
32#include <asm/unaligned.h>
33#include <linux/crc-ccitt.h>
34
35/* Maximium size of the calipso option including
36 * the two-byte TLV header.
37 */
38#define CALIPSO_OPT_LEN_MAX (2 + 252)
39
40/* Size of the minimum calipso option including
41 * the two-byte TLV header.
42 */
43#define CALIPSO_HDR_LEN (2 + 8)
44
45/* Maximium size of the calipso option including
46 * the two-byte TLV header and upto 3 bytes of
47 * leading pad and 7 bytes of trailing pad.
48 */
49#define CALIPSO_OPT_LEN_MAX_WITH_PAD (3 + CALIPSO_OPT_LEN_MAX + 7)
50
51 /* Maximium size of u32 aligned buffer required to hold calipso
52 * option. Max of 3 initial pad bytes starting from buffer + 3.
53 * i.e. the worst case is when the previous tlv finishes on 4n + 3.
54 */
55#define CALIPSO_MAX_BUFFER (6 + CALIPSO_OPT_LEN_MAX)
56
57/* List of available DOI definitions */
58static DEFINE_SPINLOCK(calipso_doi_list_lock);
59static LIST_HEAD(calipso_doi_list);
60
61/* Label mapping cache */
62int calipso_cache_enabled = 1;
63int calipso_cache_bucketsize = 10;
64#define CALIPSO_CACHE_BUCKETBITS 7
65#define CALIPSO_CACHE_BUCKETS BIT(CALIPSO_CACHE_BUCKETBITS)
66#define CALIPSO_CACHE_REORDERLIMIT 10
67struct calipso_map_cache_bkt {
68 spinlock_t lock;
69 u32 size;
70 struct list_head list;
71};
72
73struct calipso_map_cache_entry {
74 u32 hash;
75 unsigned char *key;
76 size_t key_len;
77
78 struct netlbl_lsm_cache *lsm_data;
79
80 u32 activity;
81 struct list_head list;
82};
83
84static struct calipso_map_cache_bkt *calipso_cache;
85
86static void calipso_cache_invalidate(void);
87static void calipso_doi_putdef(struct calipso_doi *doi_def);
88
89/* Label Mapping Cache Functions
90 */
91
92/**
93 * calipso_cache_entry_free - Frees a cache entry
94 * @entry: the entry to free
95 *
96 * Description:
97 * This function frees the memory associated with a cache entry including the
98 * LSM cache data if there are no longer any users, i.e. reference count == 0.
99 *
100 */
101static void calipso_cache_entry_free(struct calipso_map_cache_entry *entry)
102{
103 if (entry->lsm_data)
104 netlbl_secattr_cache_free(entry->lsm_data);
105 kfree(entry->key);
106 kfree(entry);
107}
108
109/**
110 * calipso_map_cache_hash - Hashing function for the CALIPSO cache
111 * @key: the hash key
112 * @key_len: the length of the key in bytes
113 *
114 * Description:
115 * The CALIPSO tag hashing function. Returns a 32-bit hash value.
116 *
117 */
118static u32 calipso_map_cache_hash(const unsigned char *key, u32 key_len)
119{
120 return jhash(key, key_len, 0);
121}
122
123/**
124 * calipso_cache_init - Initialize the CALIPSO cache
125 *
126 * Description:
127 * Initializes the CALIPSO label mapping cache, this function should be called
128 * before any of the other functions defined in this file. Returns zero on
129 * success, negative values on error.
130 *
131 */
132static int __init calipso_cache_init(void)
133{
134 u32 iter;
135
136 calipso_cache = kcalloc(CALIPSO_CACHE_BUCKETS,
137 sizeof(struct calipso_map_cache_bkt),
138 GFP_KERNEL);
139 if (!calipso_cache)
140 return -ENOMEM;
141
142 for (iter = 0; iter < CALIPSO_CACHE_BUCKETS; iter++) {
143 spin_lock_init(&calipso_cache[iter].lock);
144 calipso_cache[iter].size = 0;
145 INIT_LIST_HEAD(&calipso_cache[iter].list);
146 }
147
148 return 0;
149}
150
151/**
152 * calipso_cache_invalidate - Invalidates the current CALIPSO cache
153 *
154 * Description:
155 * Invalidates and frees any entries in the CALIPSO cache. Returns zero on
156 * success and negative values on failure.
157 *
158 */
159static void calipso_cache_invalidate(void)
160{
161 struct calipso_map_cache_entry *entry, *tmp_entry;
162 u32 iter;
163
164 for (iter = 0; iter < CALIPSO_CACHE_BUCKETS; iter++) {
165 spin_lock_bh(&calipso_cache[iter].lock);
166 list_for_each_entry_safe(entry,
167 tmp_entry,
168 &calipso_cache[iter].list, list) {
169 list_del(&entry->list);
170 calipso_cache_entry_free(entry);
171 }
172 calipso_cache[iter].size = 0;
173 spin_unlock_bh(&calipso_cache[iter].lock);
174 }
175}
176
177/**
178 * calipso_cache_check - Check the CALIPSO cache for a label mapping
179 * @key: the buffer to check
180 * @key_len: buffer length in bytes
181 * @secattr: the security attribute struct to use
182 *
183 * Description:
184 * This function checks the cache to see if a label mapping already exists for
185 * the given key. If there is a match then the cache is adjusted and the
186 * @secattr struct is populated with the correct LSM security attributes. The
187 * cache is adjusted in the following manner if the entry is not already the
188 * first in the cache bucket:
189 *
190 * 1. The cache entry's activity counter is incremented
191 * 2. The previous (higher ranking) entry's activity counter is decremented
192 * 3. If the difference between the two activity counters is geater than
193 * CALIPSO_CACHE_REORDERLIMIT the two entries are swapped
194 *
195 * Returns zero on success, -ENOENT for a cache miss, and other negative values
196 * on error.
197 *
198 */
199static int calipso_cache_check(const unsigned char *key,
200 u32 key_len,
201 struct netlbl_lsm_secattr *secattr)
202{
203 u32 bkt;
204 struct calipso_map_cache_entry *entry;
205 struct calipso_map_cache_entry *prev_entry = NULL;
206 u32 hash;
207
208 if (!calipso_cache_enabled)
209 return -ENOENT;
210
211 hash = calipso_map_cache_hash(key, key_len);
212 bkt = hash & (CALIPSO_CACHE_BUCKETS - 1);
213 spin_lock_bh(&calipso_cache[bkt].lock);
214 list_for_each_entry(entry, &calipso_cache[bkt].list, list) {
215 if (entry->hash == hash &&
216 entry->key_len == key_len &&
217 memcmp(entry->key, key, key_len) == 0) {
218 entry->activity += 1;
219 refcount_inc(&entry->lsm_data->refcount);
220 secattr->cache = entry->lsm_data;
221 secattr->flags |= NETLBL_SECATTR_CACHE;
222 secattr->type = NETLBL_NLTYPE_CALIPSO;
223 if (!prev_entry) {
224 spin_unlock_bh(&calipso_cache[bkt].lock);
225 return 0;
226 }
227
228 if (prev_entry->activity > 0)
229 prev_entry->activity -= 1;
230 if (entry->activity > prev_entry->activity &&
231 entry->activity - prev_entry->activity >
232 CALIPSO_CACHE_REORDERLIMIT) {
233 __list_del(entry->list.prev, entry->list.next);
234 __list_add(&entry->list,
235 prev_entry->list.prev,
236 &prev_entry->list);
237 }
238
239 spin_unlock_bh(&calipso_cache[bkt].lock);
240 return 0;
241 }
242 prev_entry = entry;
243 }
244 spin_unlock_bh(&calipso_cache[bkt].lock);
245
246 return -ENOENT;
247}
248
249/**
250 * calipso_cache_add - Add an entry to the CALIPSO cache
251 * @calipso_ptr: the CALIPSO option
252 * @secattr: the packet's security attributes
253 *
254 * Description:
255 * Add a new entry into the CALIPSO label mapping cache. Add the new entry to
256 * head of the cache bucket's list, if the cache bucket is out of room remove
257 * the last entry in the list first. It is important to note that there is
258 * currently no checking for duplicate keys. Returns zero on success,
259 * negative values on failure. The key stored starts at calipso_ptr + 2,
260 * i.e. the type and length bytes are not stored, this corresponds to
261 * calipso_ptr[1] bytes of data.
262 *
263 */
264static int calipso_cache_add(const unsigned char *calipso_ptr,
265 const struct netlbl_lsm_secattr *secattr)
266{
267 int ret_val = -EPERM;
268 u32 bkt;
269 struct calipso_map_cache_entry *entry = NULL;
270 struct calipso_map_cache_entry *old_entry = NULL;
271 u32 calipso_ptr_len;
272
273 if (!calipso_cache_enabled || calipso_cache_bucketsize <= 0)
274 return 0;
275
276 calipso_ptr_len = calipso_ptr[1];
277
278 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
279 if (!entry)
280 return -ENOMEM;
281 entry->key = kmemdup(calipso_ptr + 2, calipso_ptr_len, GFP_ATOMIC);
282 if (!entry->key) {
283 ret_val = -ENOMEM;
284 goto cache_add_failure;
285 }
286 entry->key_len = calipso_ptr_len;
287 entry->hash = calipso_map_cache_hash(calipso_ptr, calipso_ptr_len);
288 refcount_inc(&secattr->cache->refcount);
289 entry->lsm_data = secattr->cache;
290
291 bkt = entry->hash & (CALIPSO_CACHE_BUCKETS - 1);
292 spin_lock_bh(&calipso_cache[bkt].lock);
293 if (calipso_cache[bkt].size < calipso_cache_bucketsize) {
294 list_add(&entry->list, &calipso_cache[bkt].list);
295 calipso_cache[bkt].size += 1;
296 } else {
297 old_entry = list_entry(calipso_cache[bkt].list.prev,
298 struct calipso_map_cache_entry, list);
299 list_del(&old_entry->list);
300 list_add(&entry->list, &calipso_cache[bkt].list);
301 calipso_cache_entry_free(old_entry);
302 }
303 spin_unlock_bh(&calipso_cache[bkt].lock);
304
305 return 0;
306
307cache_add_failure:
308 if (entry)
309 calipso_cache_entry_free(entry);
310 return ret_val;
311}
312
313/* DOI List Functions
314 */
315
316/**
317 * calipso_doi_search - Searches for a DOI definition
318 * @doi: the DOI to search for
319 *
320 * Description:
321 * Search the DOI definition list for a DOI definition with a DOI value that
322 * matches @doi. The caller is responsible for calling rcu_read_[un]lock().
323 * Returns a pointer to the DOI definition on success and NULL on failure.
324 */
325static struct calipso_doi *calipso_doi_search(u32 doi)
326{
327 struct calipso_doi *iter;
328
329 list_for_each_entry_rcu(iter, &calipso_doi_list, list)
330 if (iter->doi == doi && refcount_read(&iter->refcount))
331 return iter;
332 return NULL;
333}
334
335/**
336 * calipso_doi_add - Add a new DOI to the CALIPSO protocol engine
337 * @doi_def: the DOI structure
338 * @audit_info: NetLabel audit information
339 *
340 * Description:
341 * The caller defines a new DOI for use by the CALIPSO engine and calls this
342 * function to add it to the list of acceptable domains. The caller must
343 * ensure that the mapping table specified in @doi_def->map meets all of the
344 * requirements of the mapping type (see calipso.h for details). Returns
345 * zero on success and non-zero on failure.
346 *
347 */
348static int calipso_doi_add(struct calipso_doi *doi_def,
349 struct netlbl_audit *audit_info)
350{
351 int ret_val = -EINVAL;
352 u32 doi;
353 u32 doi_type;
354 struct audit_buffer *audit_buf;
355
356 doi = doi_def->doi;
357 doi_type = doi_def->type;
358
359 if (doi_def->doi == CALIPSO_DOI_UNKNOWN)
360 goto doi_add_return;
361
362 refcount_set(&doi_def->refcount, 1);
363
364 spin_lock(&calipso_doi_list_lock);
365 if (calipso_doi_search(doi_def->doi)) {
366 spin_unlock(&calipso_doi_list_lock);
367 ret_val = -EEXIST;
368 goto doi_add_return;
369 }
370 list_add_tail_rcu(&doi_def->list, &calipso_doi_list);
371 spin_unlock(&calipso_doi_list_lock);
372 ret_val = 0;
373
374doi_add_return:
375 audit_buf = netlbl_audit_start(AUDIT_MAC_CALIPSO_ADD, audit_info);
376 if (audit_buf) {
377 const char *type_str;
378
379 switch (doi_type) {
380 case CALIPSO_MAP_PASS:
381 type_str = "pass";
382 break;
383 default:
384 type_str = "(unknown)";
385 }
386 audit_log_format(audit_buf,
387 " calipso_doi=%u calipso_type=%s res=%u",
388 doi, type_str, ret_val == 0 ? 1 : 0);
389 audit_log_end(audit_buf);
390 }
391
392 return ret_val;
393}
394
395/**
396 * calipso_doi_free - Frees a DOI definition
397 * @doi_def: the DOI definition
398 *
399 * Description:
400 * This function frees all of the memory associated with a DOI definition.
401 *
402 */
403static void calipso_doi_free(struct calipso_doi *doi_def)
404{
405 kfree(doi_def);
406}
407
408/**
409 * calipso_doi_free_rcu - Frees a DOI definition via the RCU pointer
410 * @entry: the entry's RCU field
411 *
412 * Description:
413 * This function is designed to be used as a callback to the call_rcu()
414 * function so that the memory allocated to the DOI definition can be released
415 * safely.
416 *
417 */
418static void calipso_doi_free_rcu(struct rcu_head *entry)
419{
420 struct calipso_doi *doi_def;
421
422 doi_def = container_of(entry, struct calipso_doi, rcu);
423 calipso_doi_free(doi_def);
424}
425
426/**
427 * calipso_doi_remove - Remove an existing DOI from the CALIPSO protocol engine
428 * @doi: the DOI value
429 * @audit_info: NetLabel audit information
430 *
431 * Description:
432 * Removes a DOI definition from the CALIPSO engine. The NetLabel routines will
433 * be called to release their own LSM domain mappings as well as our own
434 * domain list. Returns zero on success and negative values on failure.
435 *
436 */
437static int calipso_doi_remove(u32 doi, struct netlbl_audit *audit_info)
438{
439 int ret_val;
440 struct calipso_doi *doi_def;
441 struct audit_buffer *audit_buf;
442
443 spin_lock(&calipso_doi_list_lock);
444 doi_def = calipso_doi_search(doi);
445 if (!doi_def) {
446 spin_unlock(&calipso_doi_list_lock);
447 ret_val = -ENOENT;
448 goto doi_remove_return;
449 }
450 list_del_rcu(&doi_def->list);
451 spin_unlock(&calipso_doi_list_lock);
452
453 calipso_doi_putdef(doi_def);
454 ret_val = 0;
455
456doi_remove_return:
457 audit_buf = netlbl_audit_start(AUDIT_MAC_CALIPSO_DEL, audit_info);
458 if (audit_buf) {
459 audit_log_format(audit_buf,
460 " calipso_doi=%u res=%u",
461 doi, ret_val == 0 ? 1 : 0);
462 audit_log_end(audit_buf);
463 }
464
465 return ret_val;
466}
467
468/**
469 * calipso_doi_getdef - Returns a reference to a valid DOI definition
470 * @doi: the DOI value
471 *
472 * Description:
473 * Searches for a valid DOI definition and if one is found it is returned to
474 * the caller. Otherwise NULL is returned. The caller must ensure that
475 * calipso_doi_putdef() is called when the caller is done.
476 *
477 */
478static struct calipso_doi *calipso_doi_getdef(u32 doi)
479{
480 struct calipso_doi *doi_def;
481
482 rcu_read_lock();
483 doi_def = calipso_doi_search(doi);
484 if (!doi_def)
485 goto doi_getdef_return;
486 if (!refcount_inc_not_zero(&doi_def->refcount))
487 doi_def = NULL;
488
489doi_getdef_return:
490 rcu_read_unlock();
491 return doi_def;
492}
493
494/**
495 * calipso_doi_putdef - Releases a reference for the given DOI definition
496 * @doi_def: the DOI definition
497 *
498 * Description:
499 * Releases a DOI definition reference obtained from calipso_doi_getdef().
500 *
501 */
502static void calipso_doi_putdef(struct calipso_doi *doi_def)
503{
504 if (!doi_def)
505 return;
506
507 if (!refcount_dec_and_test(&doi_def->refcount))
508 return;
509
510 calipso_cache_invalidate();
511 call_rcu(&doi_def->rcu, calipso_doi_free_rcu);
512}
513
514/**
515 * calipso_doi_walk - Iterate through the DOI definitions
516 * @skip_cnt: skip past this number of DOI definitions, updated
517 * @callback: callback for each DOI definition
518 * @cb_arg: argument for the callback function
519 *
520 * Description:
521 * Iterate over the DOI definition list, skipping the first @skip_cnt entries.
522 * For each entry call @callback, if @callback returns a negative value stop
523 * 'walking' through the list and return. Updates the value in @skip_cnt upon
524 * return. Returns zero on success, negative values on failure.
525 *
526 */
527static int calipso_doi_walk(u32 *skip_cnt,
528 int (*callback)(struct calipso_doi *doi_def,
529 void *arg),
530 void *cb_arg)
531{
532 int ret_val = -ENOENT;
533 u32 doi_cnt = 0;
534 struct calipso_doi *iter_doi;
535
536 rcu_read_lock();
537 list_for_each_entry_rcu(iter_doi, &calipso_doi_list, list)
538 if (refcount_read(&iter_doi->refcount) > 0) {
539 if (doi_cnt++ < *skip_cnt)
540 continue;
541 ret_val = callback(iter_doi, cb_arg);
542 if (ret_val < 0) {
543 doi_cnt--;
544 goto doi_walk_return;
545 }
546 }
547
548doi_walk_return:
549 rcu_read_unlock();
550 *skip_cnt = doi_cnt;
551 return ret_val;
552}
553
554/**
555 * calipso_validate - Validate a CALIPSO option
556 * @skb: the packet
557 * @option: the start of the option
558 *
559 * Description:
560 * This routine is called to validate a CALIPSO option.
561 * If the option is valid then %true is returned, otherwise
562 * %false is returned.
563 *
564 * The caller should have already checked that the length of the
565 * option (including the TLV header) is >= 10 and that the catmap
566 * length is consistent with the option length.
567 *
568 * We leave checks on the level and categories to the socket layer.
569 */
570bool calipso_validate(const struct sk_buff *skb, const unsigned char *option)
571{
572 struct calipso_doi *doi_def;
573 bool ret_val;
574 u16 crc, len = option[1] + 2;
575 static const u8 zero[2];
576
577 /* The original CRC runs over the option including the TLV header
578 * with the CRC-16 field (at offset 8) zeroed out. */
579 crc = crc_ccitt(0xffff, option, 8);
580 crc = crc_ccitt(crc, zero, sizeof(zero));
581 if (len > 10)
582 crc = crc_ccitt(crc, option + 10, len - 10);
583 crc = ~crc;
584 if (option[8] != (crc & 0xff) || option[9] != ((crc >> 8) & 0xff))
585 return false;
586
587 rcu_read_lock();
588 doi_def = calipso_doi_search(get_unaligned_be32(option + 2));
589 ret_val = !!doi_def;
590 rcu_read_unlock();
591
592 return ret_val;
593}
594
595/**
596 * calipso_map_cat_hton - Perform a category mapping from host to network
597 * @doi_def: the DOI definition
598 * @secattr: the security attributes
599 * @net_cat: the zero'd out category bitmap in network/CALIPSO format
600 * @net_cat_len: the length of the CALIPSO bitmap in bytes
601 *
602 * Description:
603 * Perform a label mapping to translate a local MLS category bitmap to the
604 * correct CALIPSO bitmap using the given DOI definition. Returns the minimum
605 * size in bytes of the network bitmap on success, negative values otherwise.
606 *
607 */
608static int calipso_map_cat_hton(const struct calipso_doi *doi_def,
609 const struct netlbl_lsm_secattr *secattr,
610 unsigned char *net_cat,
611 u32 net_cat_len)
612{
613 int spot = -1;
614 u32 net_spot_max = 0;
615 u32 net_clen_bits = net_cat_len * 8;
616
617 for (;;) {
618 spot = netlbl_catmap_walk(secattr->attr.mls.cat,
619 spot + 1);
620 if (spot < 0)
621 break;
622 if (spot >= net_clen_bits)
623 return -ENOSPC;
624 netlbl_bitmap_setbit(net_cat, spot, 1);
625
626 if (spot > net_spot_max)
627 net_spot_max = spot;
628 }
629
630 return (net_spot_max / 32 + 1) * 4;
631}
632
633/**
634 * calipso_map_cat_ntoh - Perform a category mapping from network to host
635 * @doi_def: the DOI definition
636 * @net_cat: the category bitmap in network/CALIPSO format
637 * @net_cat_len: the length of the CALIPSO bitmap in bytes
638 * @secattr: the security attributes
639 *
640 * Description:
641 * Perform a label mapping to translate a CALIPSO bitmap to the correct local
642 * MLS category bitmap using the given DOI definition. Returns zero on
643 * success, negative values on failure.
644 *
645 */
646static int calipso_map_cat_ntoh(const struct calipso_doi *doi_def,
647 const unsigned char *net_cat,
648 u32 net_cat_len,
649 struct netlbl_lsm_secattr *secattr)
650{
651 int ret_val;
652 int spot = -1;
653 u32 net_clen_bits = net_cat_len * 8;
654
655 for (;;) {
656 spot = netlbl_bitmap_walk(net_cat,
657 net_clen_bits,
658 spot + 1,
659 1);
660 if (spot < 0) {
661 if (spot == -2)
662 return -EFAULT;
663 return 0;
664 }
665
666 ret_val = netlbl_catmap_setbit(&secattr->attr.mls.cat,
667 spot,
668 GFP_ATOMIC);
669 if (ret_val != 0)
670 return ret_val;
671 }
672
673 return -EINVAL;
674}
675
676/**
677 * calipso_pad_write - Writes pad bytes in TLV format
678 * @buf: the buffer
679 * @offset: offset from start of buffer to write padding
680 * @count: number of pad bytes to write
681 *
682 * Description:
683 * Write @count bytes of TLV padding into @buffer starting at offset @offset.
684 * @count should be less than 8 - see RFC 4942.
685 *
686 */
687static int calipso_pad_write(unsigned char *buf, unsigned int offset,
688 unsigned int count)
689{
690 if (WARN_ON_ONCE(count >= 8))
691 return -EINVAL;
692
693 switch (count) {
694 case 0:
695 break;
696 case 1:
697 buf[offset] = IPV6_TLV_PAD1;
698 break;
699 default:
700 buf[offset] = IPV6_TLV_PADN;
701 buf[offset + 1] = count - 2;
702 if (count > 2)
703 memset(buf + offset + 2, 0, count - 2);
704 break;
705 }
706 return 0;
707}
708
709/**
710 * calipso_genopt - Generate a CALIPSO option
711 * @buf: the option buffer
712 * @start: offset from which to write
713 * @buf_len: the size of opt_buf
714 * @doi_def: the CALIPSO DOI to use
715 * @secattr: the security attributes
716 *
717 * Description:
718 * Generate a CALIPSO option using the DOI definition and security attributes
719 * passed to the function. This also generates upto three bytes of leading
720 * padding that ensures that the option is 4n + 2 aligned. It returns the
721 * number of bytes written (including any initial padding).
722 */
723static int calipso_genopt(unsigned char *buf, u32 start, u32 buf_len,
724 const struct calipso_doi *doi_def,
725 const struct netlbl_lsm_secattr *secattr)
726{
727 int ret_val;
728 u32 len, pad;
729 u16 crc;
730 static const unsigned char padding[4] = {2, 1, 0, 3};
731 unsigned char *calipso;
732
733 /* CALIPSO has 4n + 2 alignment */
734 pad = padding[start & 3];
735 if (buf_len <= start + pad + CALIPSO_HDR_LEN)
736 return -ENOSPC;
737
738 if ((secattr->flags & NETLBL_SECATTR_MLS_LVL) == 0)
739 return -EPERM;
740
741 len = CALIPSO_HDR_LEN;
742
743 if (secattr->flags & NETLBL_SECATTR_MLS_CAT) {
744 ret_val = calipso_map_cat_hton(doi_def,
745 secattr,
746 buf + start + pad + len,
747 buf_len - start - pad - len);
748 if (ret_val < 0)
749 return ret_val;
750 len += ret_val;
751 }
752
753 calipso_pad_write(buf, start, pad);
754 calipso = buf + start + pad;
755
756 calipso[0] = IPV6_TLV_CALIPSO;
757 calipso[1] = len - 2;
758 *(__be32 *)(calipso + 2) = htonl(doi_def->doi);
759 calipso[6] = (len - CALIPSO_HDR_LEN) / 4;
760 calipso[7] = secattr->attr.mls.lvl;
761 crc = ~crc_ccitt(0xffff, calipso, len);
762 calipso[8] = crc & 0xff;
763 calipso[9] = (crc >> 8) & 0xff;
764 return pad + len;
765}
766
767/* Hop-by-hop hdr helper functions
768 */
769
770/**
771 * calipso_opt_update - Replaces socket's hop options with a new set
772 * @sk: the socket
773 * @hop: new hop options
774 *
775 * Description:
776 * Replaces @sk's hop options with @hop. @hop may be NULL to leave
777 * the socket with no hop options.
778 *
779 */
780static int calipso_opt_update(struct sock *sk, struct ipv6_opt_hdr *hop)
781{
782 struct ipv6_txoptions *old = txopt_get(inet6_sk(sk)), *txopts;
783
784 txopts = ipv6_renew_options(sk, old, IPV6_HOPOPTS, hop);
785 txopt_put(old);
786 if (IS_ERR(txopts))
787 return PTR_ERR(txopts);
788
789 txopts = ipv6_update_options(sk, txopts);
790 if (txopts) {
791 atomic_sub(txopts->tot_len, &sk->sk_omem_alloc);
792 txopt_put(txopts);
793 }
794
795 return 0;
796}
797
798/**
799 * calipso_tlv_len - Returns the length of the TLV
800 * @opt: the option header
801 * @offset: offset of the TLV within the header
802 *
803 * Description:
804 * Returns the length of the TLV option at offset @offset within
805 * the option header @opt. Checks that the entire TLV fits inside
806 * the option header, returns a negative value if this is not the case.
807 */
808static int calipso_tlv_len(struct ipv6_opt_hdr *opt, unsigned int offset)
809{
810 unsigned char *tlv = (unsigned char *)opt;
811 unsigned int opt_len = ipv6_optlen(opt), tlv_len;
812
813 if (offset < sizeof(*opt) || offset >= opt_len)
814 return -EINVAL;
815 if (tlv[offset] == IPV6_TLV_PAD1)
816 return 1;
817 if (offset + 1 >= opt_len)
818 return -EINVAL;
819 tlv_len = tlv[offset + 1] + 2;
820 if (offset + tlv_len > opt_len)
821 return -EINVAL;
822 return tlv_len;
823}
824
825/**
826 * calipso_opt_find - Finds the CALIPSO option in an IPv6 hop options header
827 * @hop: the hop options header
828 * @start: on return holds the offset of any leading padding
829 * @end: on return holds the offset of the first non-pad TLV after CALIPSO
830 *
831 * Description:
832 * Finds the space occupied by a CALIPSO option (including any leading and
833 * trailing padding).
834 *
835 * If a CALIPSO option exists set @start and @end to the
836 * offsets within @hop of the start of padding before the first
837 * CALIPSO option and the end of padding after the first CALIPSO
838 * option. In this case the function returns 0.
839 *
840 * In the absence of a CALIPSO option, @start and @end will be
841 * set to the start and end of any trailing padding in the header.
842 * This is useful when appending a new option, as the caller may want
843 * to overwrite some of this padding. In this case the function will
844 * return -ENOENT.
845 */
846static int calipso_opt_find(struct ipv6_opt_hdr *hop, unsigned int *start,
847 unsigned int *end)
848{
849 int ret_val = -ENOENT, tlv_len;
850 unsigned int opt_len, offset, offset_s = 0, offset_e = 0;
851 unsigned char *opt = (unsigned char *)hop;
852
853 opt_len = ipv6_optlen(hop);
854 offset = sizeof(*hop);
855
856 while (offset < opt_len) {
857 tlv_len = calipso_tlv_len(hop, offset);
858 if (tlv_len < 0)
859 return tlv_len;
860
861 switch (opt[offset]) {
862 case IPV6_TLV_PAD1:
863 case IPV6_TLV_PADN:
864 if (offset_e)
865 offset_e = offset;
866 break;
867 case IPV6_TLV_CALIPSO:
868 ret_val = 0;
869 offset_e = offset;
870 break;
871 default:
872 if (offset_e == 0)
873 offset_s = offset;
874 else
875 goto out;
876 }
877 offset += tlv_len;
878 }
879
880out:
881 if (offset_s)
882 *start = offset_s + calipso_tlv_len(hop, offset_s);
883 else
884 *start = sizeof(*hop);
885 if (offset_e)
886 *end = offset_e + calipso_tlv_len(hop, offset_e);
887 else
888 *end = opt_len;
889
890 return ret_val;
891}
892
893/**
894 * calipso_opt_insert - Inserts a CALIPSO option into an IPv6 hop opt hdr
895 * @hop: the original hop options header
896 * @doi_def: the CALIPSO DOI to use
897 * @secattr: the specific security attributes of the socket
898 *
899 * Description:
900 * Creates a new hop options header based on @hop with a
901 * CALIPSO option added to it. If @hop already contains a CALIPSO
902 * option this is overwritten, otherwise the new option is appended
903 * after any existing options. If @hop is NULL then the new header
904 * will contain just the CALIPSO option and any needed padding.
905 *
906 */
907static struct ipv6_opt_hdr *
908calipso_opt_insert(struct ipv6_opt_hdr *hop,
909 const struct calipso_doi *doi_def,
910 const struct netlbl_lsm_secattr *secattr)
911{
912 unsigned int start, end, buf_len, pad, hop_len;
913 struct ipv6_opt_hdr *new;
914 int ret_val;
915
916 if (hop) {
917 hop_len = ipv6_optlen(hop);
918 ret_val = calipso_opt_find(hop, &start, &end);
919 if (ret_val && ret_val != -ENOENT)
920 return ERR_PTR(ret_val);
921 } else {
922 hop_len = 0;
923 start = sizeof(*hop);
924 end = 0;
925 }
926
927 buf_len = hop_len + start - end + CALIPSO_OPT_LEN_MAX_WITH_PAD;
928 new = kzalloc(buf_len, GFP_ATOMIC);
929 if (!new)
930 return ERR_PTR(-ENOMEM);
931
932 if (start > sizeof(*hop))
933 memcpy(new, hop, start);
934 ret_val = calipso_genopt((unsigned char *)new, start, buf_len, doi_def,
935 secattr);
936 if (ret_val < 0) {
937 kfree(new);
938 return ERR_PTR(ret_val);
939 }
940
941 buf_len = start + ret_val;
942 /* At this point buf_len aligns to 4n, so (buf_len & 4) pads to 8n */
943 pad = ((buf_len & 4) + (end & 7)) & 7;
944 calipso_pad_write((unsigned char *)new, buf_len, pad);
945 buf_len += pad;
946
947 if (end != hop_len) {
948 memcpy((char *)new + buf_len, (char *)hop + end, hop_len - end);
949 buf_len += hop_len - end;
950 }
951 new->nexthdr = 0;
952 new->hdrlen = buf_len / 8 - 1;
953
954 return new;
955}
956
957/**
958 * calipso_opt_del - Removes the CALIPSO option from an option header
959 * @hop: the original header
960 * @new: the new header
961 *
962 * Description:
963 * Creates a new header based on @hop without any CALIPSO option. If @hop
964 * doesn't contain a CALIPSO option it returns -ENOENT. If @hop contains
965 * no other non-padding options, it returns zero with @new set to NULL.
966 * Otherwise it returns zero, creates a new header without the CALIPSO
967 * option (and removing as much padding as possible) and returns with
968 * @new set to that header.
969 *
970 */
971static int calipso_opt_del(struct ipv6_opt_hdr *hop,
972 struct ipv6_opt_hdr **new)
973{
974 int ret_val;
975 unsigned int start, end, delta, pad, hop_len;
976
977 ret_val = calipso_opt_find(hop, &start, &end);
978 if (ret_val)
979 return ret_val;
980
981 hop_len = ipv6_optlen(hop);
982 if (start == sizeof(*hop) && end == hop_len) {
983 /* There's no other option in the header so return NULL */
984 *new = NULL;
985 return 0;
986 }
987
988 delta = (end - start) & ~7;
989 *new = kzalloc(hop_len - delta, GFP_ATOMIC);
990 if (!*new)
991 return -ENOMEM;
992
993 memcpy(*new, hop, start);
994 (*new)->hdrlen -= delta / 8;
995 pad = (end - start) & 7;
996 calipso_pad_write((unsigned char *)*new, start, pad);
997 if (end != hop_len)
998 memcpy((char *)*new + start + pad, (char *)hop + end,
999 hop_len - end);
1000
1001 return 0;
1002}
1003
1004/**
1005 * calipso_opt_getattr - Get the security attributes from a memory block
1006 * @calipso: the CALIPSO option
1007 * @secattr: the security attributes
1008 *
1009 * Description:
1010 * Inspect @calipso and return the security attributes in @secattr.
1011 * Returns zero on success and negative values on failure.
1012 *
1013 */
1014static int calipso_opt_getattr(const unsigned char *calipso,
1015 struct netlbl_lsm_secattr *secattr)
1016{
1017 int ret_val = -ENOMSG;
1018 u32 doi, len = calipso[1], cat_len = calipso[6] * 4;
1019 struct calipso_doi *doi_def;
1020
1021 if (cat_len + 8 > len)
1022 return -EINVAL;
1023
1024 if (calipso_cache_check(calipso + 2, calipso[1], secattr) == 0)
1025 return 0;
1026
1027 doi = get_unaligned_be32(calipso + 2);
1028 rcu_read_lock();
1029 doi_def = calipso_doi_search(doi);
1030 if (!doi_def)
1031 goto getattr_return;
1032
1033 secattr->attr.mls.lvl = calipso[7];
1034 secattr->flags |= NETLBL_SECATTR_MLS_LVL;
1035
1036 if (cat_len) {
1037 ret_val = calipso_map_cat_ntoh(doi_def,
1038 calipso + 10,
1039 cat_len,
1040 secattr);
1041 if (ret_val != 0) {
1042 netlbl_catmap_free(secattr->attr.mls.cat);
1043 goto getattr_return;
1044 }
1045
1046 if (secattr->attr.mls.cat)
1047 secattr->flags |= NETLBL_SECATTR_MLS_CAT;
1048 }
1049
1050 secattr->type = NETLBL_NLTYPE_CALIPSO;
1051
1052getattr_return:
1053 rcu_read_unlock();
1054 return ret_val;
1055}
1056
1057/* sock functions.
1058 */
1059
1060/**
1061 * calipso_sock_getattr - Get the security attributes from a sock
1062 * @sk: the sock
1063 * @secattr: the security attributes
1064 *
1065 * Description:
1066 * Query @sk to see if there is a CALIPSO option attached to the sock and if
1067 * there is return the CALIPSO security attributes in @secattr. This function
1068 * requires that @sk be locked, or privately held, but it does not do any
1069 * locking itself. Returns zero on success and negative values on failure.
1070 *
1071 */
1072static int calipso_sock_getattr(struct sock *sk,
1073 struct netlbl_lsm_secattr *secattr)
1074{
1075 struct ipv6_opt_hdr *hop;
1076 int opt_len, len, ret_val = -ENOMSG, offset;
1077 unsigned char *opt;
1078 struct ipv6_txoptions *txopts = txopt_get(inet6_sk(sk));
1079
1080 if (!txopts || !txopts->hopopt)
1081 goto done;
1082
1083 hop = txopts->hopopt;
1084 opt = (unsigned char *)hop;
1085 opt_len = ipv6_optlen(hop);
1086 offset = sizeof(*hop);
1087 while (offset < opt_len) {
1088 len = calipso_tlv_len(hop, offset);
1089 if (len < 0) {
1090 ret_val = len;
1091 goto done;
1092 }
1093 switch (opt[offset]) {
1094 case IPV6_TLV_CALIPSO:
1095 if (len < CALIPSO_HDR_LEN)
1096 ret_val = -EINVAL;
1097 else
1098 ret_val = calipso_opt_getattr(&opt[offset],
1099 secattr);
1100 goto done;
1101 default:
1102 offset += len;
1103 break;
1104 }
1105 }
1106done:
1107 txopt_put(txopts);
1108 return ret_val;
1109}
1110
1111/**
1112 * calipso_sock_setattr - Add a CALIPSO option to a socket
1113 * @sk: the socket
1114 * @doi_def: the CALIPSO DOI to use
1115 * @secattr: the specific security attributes of the socket
1116 *
1117 * Description:
1118 * Set the CALIPSO option on the given socket using the DOI definition and
1119 * security attributes passed to the function. This function requires
1120 * exclusive access to @sk, which means it either needs to be in the
1121 * process of being created or locked. Returns zero on success and negative
1122 * values on failure.
1123 *
1124 */
1125static int calipso_sock_setattr(struct sock *sk,
1126 const struct calipso_doi *doi_def,
1127 const struct netlbl_lsm_secattr *secattr)
1128{
1129 int ret_val;
1130 struct ipv6_opt_hdr *old, *new;
1131 struct ipv6_txoptions *txopts = txopt_get(inet6_sk(sk));
1132
1133 old = NULL;
1134 if (txopts)
1135 old = txopts->hopopt;
1136
1137 new = calipso_opt_insert(old, doi_def, secattr);
1138 txopt_put(txopts);
1139 if (IS_ERR(new))
1140 return PTR_ERR(new);
1141
1142 ret_val = calipso_opt_update(sk, new);
1143
1144 kfree(new);
1145 return ret_val;
1146}
1147
1148/**
1149 * calipso_sock_delattr - Delete the CALIPSO option from a socket
1150 * @sk: the socket
1151 *
1152 * Description:
1153 * Removes the CALIPSO option from a socket, if present.
1154 *
1155 */
1156static void calipso_sock_delattr(struct sock *sk)
1157{
1158 struct ipv6_opt_hdr *new_hop;
1159 struct ipv6_txoptions *txopts = txopt_get(inet6_sk(sk));
1160
1161 if (!txopts || !txopts->hopopt)
1162 goto done;
1163
1164 if (calipso_opt_del(txopts->hopopt, &new_hop))
1165 goto done;
1166
1167 calipso_opt_update(sk, new_hop);
1168 kfree(new_hop);
1169
1170done:
1171 txopt_put(txopts);
1172}
1173
1174/* request sock functions.
1175 */
1176
1177/**
1178 * calipso_req_setattr - Add a CALIPSO option to a connection request socket
1179 * @req: the connection request socket
1180 * @doi_def: the CALIPSO DOI to use
1181 * @secattr: the specific security attributes of the socket
1182 *
1183 * Description:
1184 * Set the CALIPSO option on the given socket using the DOI definition and
1185 * security attributes passed to the function. Returns zero on success and
1186 * negative values on failure.
1187 *
1188 */
1189static int calipso_req_setattr(struct request_sock *req,
1190 const struct calipso_doi *doi_def,
1191 const struct netlbl_lsm_secattr *secattr)
1192{
1193 struct ipv6_txoptions *txopts;
1194 struct inet_request_sock *req_inet = inet_rsk(req);
1195 struct ipv6_opt_hdr *old, *new;
1196 struct sock *sk = sk_to_full_sk(req_to_sk(req));
1197
1198 if (req_inet->ipv6_opt && req_inet->ipv6_opt->hopopt)
1199 old = req_inet->ipv6_opt->hopopt;
1200 else
1201 old = NULL;
1202
1203 new = calipso_opt_insert(old, doi_def, secattr);
1204 if (IS_ERR(new))
1205 return PTR_ERR(new);
1206
1207 txopts = ipv6_renew_options(sk, req_inet->ipv6_opt, IPV6_HOPOPTS, new);
1208
1209 kfree(new);
1210
1211 if (IS_ERR(txopts))
1212 return PTR_ERR(txopts);
1213
1214 txopts = xchg(&req_inet->ipv6_opt, txopts);
1215 if (txopts) {
1216 atomic_sub(txopts->tot_len, &sk->sk_omem_alloc);
1217 txopt_put(txopts);
1218 }
1219
1220 return 0;
1221}
1222
1223/**
1224 * calipso_req_delattr - Delete the CALIPSO option from a request socket
1225 * @req: the request socket
1226 *
1227 * Description:
1228 * Removes the CALIPSO option from a request socket, if present.
1229 *
1230 */
1231static void calipso_req_delattr(struct request_sock *req)
1232{
1233 struct inet_request_sock *req_inet = inet_rsk(req);
1234 struct ipv6_opt_hdr *new;
1235 struct ipv6_txoptions *txopts;
1236 struct sock *sk = sk_to_full_sk(req_to_sk(req));
1237
1238 if (!req_inet->ipv6_opt || !req_inet->ipv6_opt->hopopt)
1239 return;
1240
1241 if (calipso_opt_del(req_inet->ipv6_opt->hopopt, &new))
1242 return; /* Nothing to do */
1243
1244 txopts = ipv6_renew_options(sk, req_inet->ipv6_opt, IPV6_HOPOPTS, new);
1245
1246 if (!IS_ERR(txopts)) {
1247 txopts = xchg(&req_inet->ipv6_opt, txopts);
1248 if (txopts) {
1249 atomic_sub(txopts->tot_len, &sk->sk_omem_alloc);
1250 txopt_put(txopts);
1251 }
1252 }
1253 kfree(new);
1254}
1255
1256/* skbuff functions.
1257 */
1258
1259/**
1260 * calipso_skbuff_optptr - Find the CALIPSO option in the packet
1261 * @skb: the packet
1262 *
1263 * Description:
1264 * Parse the packet's IP header looking for a CALIPSO option. Returns a pointer
1265 * to the start of the CALIPSO option on success, NULL if one if not found.
1266 *
1267 */
1268static unsigned char *calipso_skbuff_optptr(const struct sk_buff *skb)
1269{
1270 const struct ipv6hdr *ip6_hdr = ipv6_hdr(skb);
1271 int offset;
1272
1273 if (ip6_hdr->nexthdr != NEXTHDR_HOP)
1274 return NULL;
1275
1276 offset = ipv6_find_tlv(skb, sizeof(*ip6_hdr), IPV6_TLV_CALIPSO);
1277 if (offset >= 0)
1278 return (unsigned char *)ip6_hdr + offset;
1279
1280 return NULL;
1281}
1282
1283/**
1284 * calipso_skbuff_setattr - Set the CALIPSO option on a packet
1285 * @skb: the packet
1286 * @doi_def: the CALIPSO DOI to use
1287 * @secattr: the security attributes
1288 *
1289 * Description:
1290 * Set the CALIPSO option on the given packet based on the security attributes.
1291 * Returns a pointer to the IP header on success and NULL on failure.
1292 *
1293 */
1294static int calipso_skbuff_setattr(struct sk_buff *skb,
1295 const struct calipso_doi *doi_def,
1296 const struct netlbl_lsm_secattr *secattr)
1297{
1298 int ret_val;
1299 struct ipv6hdr *ip6_hdr;
1300 struct ipv6_opt_hdr *hop;
1301 unsigned char buf[CALIPSO_MAX_BUFFER];
1302 int len_delta, new_end, pad, payload;
1303 unsigned int start, end;
1304
1305 ip6_hdr = ipv6_hdr(skb);
1306 if (ip6_hdr->nexthdr == NEXTHDR_HOP) {
1307 hop = (struct ipv6_opt_hdr *)(ip6_hdr + 1);
1308 ret_val = calipso_opt_find(hop, &start, &end);
1309 if (ret_val && ret_val != -ENOENT)
1310 return ret_val;
1311 } else {
1312 start = 0;
1313 end = 0;
1314 }
1315
1316 memset(buf, 0, sizeof(buf));
1317 ret_val = calipso_genopt(buf, start & 3, sizeof(buf), doi_def, secattr);
1318 if (ret_val < 0)
1319 return ret_val;
1320
1321 new_end = start + ret_val;
1322 /* At this point new_end aligns to 4n, so (new_end & 4) pads to 8n */
1323 pad = ((new_end & 4) + (end & 7)) & 7;
1324 len_delta = new_end - (int)end + pad;
1325 ret_val = skb_cow(skb, skb_headroom(skb) + len_delta);
1326 if (ret_val < 0)
1327 return ret_val;
1328
1329 ip6_hdr = ipv6_hdr(skb); /* Reset as skb_cow() may have moved it */
1330
1331 if (len_delta) {
1332 if (len_delta > 0)
1333 skb_push(skb, len_delta);
1334 else
1335 skb_pull(skb, -len_delta);
1336 memmove((char *)ip6_hdr - len_delta, ip6_hdr,
1337 sizeof(*ip6_hdr) + start);
1338 skb_reset_network_header(skb);
1339 ip6_hdr = ipv6_hdr(skb);
1340 payload = ntohs(ip6_hdr->payload_len);
1341 ip6_hdr->payload_len = htons(payload + len_delta);
1342 }
1343
1344 hop = (struct ipv6_opt_hdr *)(ip6_hdr + 1);
1345 if (start == 0) {
1346 struct ipv6_opt_hdr *new_hop = (struct ipv6_opt_hdr *)buf;
1347
1348 new_hop->nexthdr = ip6_hdr->nexthdr;
1349 new_hop->hdrlen = len_delta / 8 - 1;
1350 ip6_hdr->nexthdr = NEXTHDR_HOP;
1351 } else {
1352 hop->hdrlen += len_delta / 8;
1353 }
1354 memcpy((char *)hop + start, buf + (start & 3), new_end - start);
1355 calipso_pad_write((unsigned char *)hop, new_end, pad);
1356
1357 return 0;
1358}
1359
1360/**
1361 * calipso_skbuff_delattr - Delete any CALIPSO options from a packet
1362 * @skb: the packet
1363 *
1364 * Description:
1365 * Removes any and all CALIPSO options from the given packet. Returns zero on
1366 * success, negative values on failure.
1367 *
1368 */
1369static int calipso_skbuff_delattr(struct sk_buff *skb)
1370{
1371 int ret_val;
1372 struct ipv6hdr *ip6_hdr;
1373 struct ipv6_opt_hdr *old_hop;
1374 u32 old_hop_len, start = 0, end = 0, delta, size, pad;
1375
1376 if (!calipso_skbuff_optptr(skb))
1377 return 0;
1378
1379 /* since we are changing the packet we should make a copy */
1380 ret_val = skb_cow(skb, skb_headroom(skb));
1381 if (ret_val < 0)
1382 return ret_val;
1383
1384 ip6_hdr = ipv6_hdr(skb);
1385 old_hop = (struct ipv6_opt_hdr *)(ip6_hdr + 1);
1386 old_hop_len = ipv6_optlen(old_hop);
1387
1388 ret_val = calipso_opt_find(old_hop, &start, &end);
1389 if (ret_val)
1390 return ret_val;
1391
1392 if (start == sizeof(*old_hop) && end == old_hop_len) {
1393 /* There's no other option in the header so we delete
1394 * the whole thing. */
1395 delta = old_hop_len;
1396 size = sizeof(*ip6_hdr);
1397 ip6_hdr->nexthdr = old_hop->nexthdr;
1398 } else {
1399 delta = (end - start) & ~7;
1400 if (delta)
1401 old_hop->hdrlen -= delta / 8;
1402 pad = (end - start) & 7;
1403 size = sizeof(*ip6_hdr) + start + pad;
1404 calipso_pad_write((unsigned char *)old_hop, start, pad);
1405 }
1406
1407 if (delta) {
1408 skb_pull(skb, delta);
1409 memmove((char *)ip6_hdr + delta, ip6_hdr, size);
1410 skb_reset_network_header(skb);
1411 }
1412
1413 return 0;
1414}
1415
1416static const struct netlbl_calipso_ops ops = {
1417 .doi_add = calipso_doi_add,
1418 .doi_free = calipso_doi_free,
1419 .doi_remove = calipso_doi_remove,
1420 .doi_getdef = calipso_doi_getdef,
1421 .doi_putdef = calipso_doi_putdef,
1422 .doi_walk = calipso_doi_walk,
1423 .sock_getattr = calipso_sock_getattr,
1424 .sock_setattr = calipso_sock_setattr,
1425 .sock_delattr = calipso_sock_delattr,
1426 .req_setattr = calipso_req_setattr,
1427 .req_delattr = calipso_req_delattr,
1428 .opt_getattr = calipso_opt_getattr,
1429 .skbuff_optptr = calipso_skbuff_optptr,
1430 .skbuff_setattr = calipso_skbuff_setattr,
1431 .skbuff_delattr = calipso_skbuff_delattr,
1432 .cache_invalidate = calipso_cache_invalidate,
1433 .cache_add = calipso_cache_add
1434};
1435
1436/**
1437 * calipso_init - Initialize the CALIPSO module
1438 *
1439 * Description:
1440 * Initialize the CALIPSO module and prepare it for use. Returns zero on
1441 * success and negative values on failure.
1442 *
1443 */
1444int __init calipso_init(void)
1445{
1446 int ret_val;
1447
1448 ret_val = calipso_cache_init();
1449 if (!ret_val)
1450 netlbl_calipso_ops_register(&ops);
1451 return ret_val;
1452}
1453
1454void calipso_exit(void)
1455{
1456 netlbl_calipso_ops_register(NULL);
1457 calipso_cache_invalidate();
1458 kfree(calipso_cache);
1459}