summaryrefslogtreecommitdiff
path: root/net/netlabel/netlabel_calipso.c
blob: f28c8947c730e829bd6ede326b946640989e7865 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * NetLabel CALIPSO/IPv6 Support
 *
 * This file defines the CALIPSO/IPv6 functions for the NetLabel system.  The
 * NetLabel system manages static and dynamic label mappings for network
 * protocols such as CIPSO and CALIPSO.
 *
 * Authors: Paul Moore <paul@paul-moore.com>
 *          Huw Davies <huw@codeweavers.com>
 */

/* (c) Copyright Hewlett-Packard Development Company, L.P., 2006
 * (c) Copyright Huw Davies <huw@codeweavers.com>, 2015
 */

#include <linux/types.h>
#include <linux/socket.h>
#include <linux/string.h>
#include <linux/skbuff.h>
#include <linux/audit.h>
#include <linux/slab.h>
#include <net/sock.h>
#include <net/netlink.h>
#include <net/genetlink.h>
#include <net/netlabel.h>
#include <net/calipso.h>
#include <linux/atomic.h>

#include "netlabel_user.h"
#include "netlabel_calipso.h"
#include "netlabel_mgmt.h"
#include "netlabel_domainhash.h"

/* Argument struct for calipso_doi_walk() */
struct netlbl_calipso_doiwalk_arg {
	struct netlink_callback *nl_cb;
	struct sk_buff *skb;
	u32 seq;
};

/* Argument struct for netlbl_domhsh_walk() */
struct netlbl_domhsh_walk_arg {
	struct netlbl_audit *audit_info;
	u32 doi;
};

/* NetLabel Generic NETLINK CALIPSO family */
static struct genl_family netlbl_calipso_gnl_family;

/* NetLabel Netlink attribute policy */
static const struct nla_policy calipso_genl_policy[NLBL_CALIPSO_A_MAX + 1] = {
	[NLBL_CALIPSO_A_DOI] = { .type = NLA_U32 },
	[NLBL_CALIPSO_A_MTYPE] = { .type = NLA_U32 },
};

/* NetLabel Command Handlers
 */
/**
 * netlbl_calipso_add_pass - Adds a CALIPSO pass DOI definition
 * @info: the Generic NETLINK info block
 * @audit_info: NetLabel audit information
 *
 * Description:
 * Create a new CALIPSO_MAP_PASS DOI definition based on the given ADD message
 * and add it to the CALIPSO engine.  Return zero on success and non-zero on
 * error.
 *
 */
static int netlbl_calipso_add_pass(struct genl_info *info,
				   struct netlbl_audit *audit_info)
{
	int ret_val;
	struct calipso_doi *doi_def = NULL;

	doi_def = kmalloc(sizeof(*doi_def), GFP_KERNEL);
	if (!doi_def)
		return -ENOMEM;
	doi_def->type = CALIPSO_MAP_PASS;
	doi_def->doi = nla_get_u32(info->attrs[NLBL_CALIPSO_A_DOI]);
	ret_val = calipso_doi_add(doi_def, audit_info);
	if (ret_val != 0)
		calipso_doi_free(doi_def);

	return ret_val;
}

/**
 * netlbl_calipso_add - Handle an ADD message
 * @skb: the NETLINK buffer
 * @info: the Generic NETLINK info block
 *
 * Description:
 * Create a new DOI definition based on the given ADD message and add it to the
 * CALIPSO engine.  Returns zero on success, negative values on failure.
 *
 */
static int netlbl_calipso_add(struct sk_buff *skb, struct genl_info *info)

{
	int ret_val = -EINVAL;
	struct netlbl_audit audit_info;

	if (!info->attrs[NLBL_CALIPSO_A_DOI] ||
	    !info->attrs[NLBL_CALIPSO_A_MTYPE])
		return -EINVAL;

	netlbl_netlink_auditinfo(skb, &audit_info);
	switch (nla_get_u32(info->attrs[NLBL_CALIPSO_A_MTYPE])) {
	case CALIPSO_MAP_PASS:
		ret_val = netlbl_calipso_add_pass(info, &audit_info);
		break;
	}
	if (ret_val == 0)
		atomic_inc(&netlabel_mgmt_protocount);

	return ret_val;
}

/**
 * netlbl_calipso_list - Handle a LIST message
 * @skb: the NETLINK buffer
 * @info: the Generic NETLINK info block
 *
 * Description:
 * Process a user generated LIST message and respond accordingly.
 * Returns zero on success and negative values on error.
 *
 */
static int netlbl_calipso_list(struct sk_buff *skb, struct genl_info *info)
{
	int ret_val;
	struct sk_buff *ans_skb = NULL;
	void *data;
	u32 doi;
	struct calipso_doi *doi_def;

	if (!info->attrs[NLBL_CALIPSO_A_DOI]) {
		ret_val = -EINVAL;
		goto list_failure;
	}

	doi = nla_get_u32(info->attrs[NLBL_CALIPSO_A_DOI]);

	doi_def = calipso_doi_getdef(doi);
	if (!doi_def) {
		ret_val = -EINVAL;
		goto list_failure;
	}

	ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
	if (!ans_skb) {
		ret_val = -ENOMEM;
		goto list_failure_put;
	}
	data = genlmsg_put_reply(ans_skb, info, &netlbl_calipso_gnl_family,
				 0, NLBL_CALIPSO_C_LIST);
	if (!data) {
		ret_val = -ENOMEM;
		goto list_failure_put;
	}

	ret_val = nla_put_u32(ans_skb, NLBL_CALIPSO_A_MTYPE, doi_def->type);
	if (ret_val != 0)
		goto list_failure_put;

	calipso_doi_putdef(doi_def);

	genlmsg_end(ans_skb, data);
	return genlmsg_reply(ans_skb, info);

list_failure_put:
	calipso_doi_putdef(doi_def);
list_failure:
	kfree_skb(ans_skb);
	return ret_val;
}

/**
 * netlbl_calipso_listall_cb - calipso_doi_walk() callback for LISTALL
 * @doi_def: the CALIPSO DOI definition
 * @arg: the netlbl_calipso_doiwalk_arg structure
 *
 * Description:
 * This function is designed to be used as a callback to the
 * calipso_doi_walk() function for use in generating a response for a LISTALL
 * message.  Returns the size of the message on success, negative values on
 * failure.
 *
 */
static int netlbl_calipso_listall_cb(struct calipso_doi *doi_def, void *arg)
{
	int ret_val = -ENOMEM;
	struct netlbl_calipso_doiwalk_arg *cb_arg = arg;
	void *data;

	data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).portid,
			   cb_arg->seq, &netlbl_calipso_gnl_family,
			   NLM_F_MULTI, NLBL_CALIPSO_C_LISTALL);
	if (!data)
		goto listall_cb_failure;

	ret_val = nla_put_u32(cb_arg->skb, NLBL_CALIPSO_A_DOI, doi_def->doi);
	if (ret_val != 0)
		goto listall_cb_failure;
	ret_val = nla_put_u32(cb_arg->skb,
			      NLBL_CALIPSO_A_MTYPE,
			      doi_def->type);
	if (ret_val != 0)
		goto listall_cb_failure;

	genlmsg_end(cb_arg->skb, data);
	return 0;

listall_cb_failure:
	genlmsg_cancel(cb_arg->skb, data);
	return ret_val;
}

/**
 * netlbl_calipso_listall - Handle a LISTALL message
 * @skb: the NETLINK buffer
 * @cb: the NETLINK callback
 *
 * Description:
 * Process a user generated LISTALL message and respond accordingly.  Returns
 * zero on success and negative values on error.
 *
 */
static int netlbl_calipso_listall(struct sk_buff *skb,
				  struct netlink_callback *cb)
{
	struct netlbl_calipso_doiwalk_arg cb_arg;
	u32 doi_skip = cb->args[0];

	cb_arg.nl_cb = cb;
	cb_arg.skb = skb;
	cb_arg.seq = cb->nlh->nlmsg_seq;

	calipso_doi_walk(&doi_skip, netlbl_calipso_listall_cb, &cb_arg);

	cb->args[0] = doi_skip;
	return skb->len;
}

/**
 * netlbl_calipso_remove_cb - netlbl_calipso_remove() callback for REMOVE
 * @entry: LSM domain mapping entry
 * @arg: the netlbl_domhsh_walk_arg structure
 *
 * Description:
 * This function is intended for use by netlbl_calipso_remove() as the callback
 * for the netlbl_domhsh_walk() function; it removes LSM domain map entries
 * which are associated with the CALIPSO DOI specified in @arg.  Returns zero on
 * success, negative values on failure.
 *
 */
static int netlbl_calipso_remove_cb(struct netlbl_dom_map *entry, void *arg)
{
	struct netlbl_domhsh_walk_arg *cb_arg = arg;

	if (entry->def.type == NETLBL_NLTYPE_CALIPSO &&
	    entry->def.calipso->doi == cb_arg->doi)
		return netlbl_domhsh_remove_entry(entry, cb_arg->audit_info);

	return 0;
}

/**
 * netlbl_calipso_remove - Handle a REMOVE message
 * @skb: the NETLINK buffer
 * @info: the Generic NETLINK info block
 *
 * Description:
 * Process a user generated REMOVE message and respond accordingly.  Returns
 * zero on success, negative values on failure.
 *
 */
static int netlbl_calipso_remove(struct sk_buff *skb, struct genl_info *info)
{
	int ret_val = -EINVAL;
	struct netlbl_domhsh_walk_arg cb_arg;
	struct netlbl_audit audit_info;
	u32 skip_bkt = 0;
	u32 skip_chain = 0;

	if (!info->attrs[NLBL_CALIPSO_A_DOI])
		return -EINVAL;

	netlbl_netlink_auditinfo(skb, &audit_info);
	cb_arg.doi = nla_get_u32(info->attrs[NLBL_CALIPSO_A_DOI]);
	cb_arg.audit_info = &audit_info;
	ret_val = netlbl_domhsh_walk(&skip_bkt, &skip_chain,
				     netlbl_calipso_remove_cb, &cb_arg);
	if (ret_val == 0 || ret_val == -ENOENT) {
		ret_val = calipso_doi_remove(cb_arg.doi, &audit_info);
		if (ret_val == 0)
			atomic_dec(&netlabel_mgmt_protocount);
	}

	return ret_val;
}

/* NetLabel Generic NETLINK Command Definitions
 */

static const struct genl_small_ops netlbl_calipso_ops[] = {
	{
	.cmd = NLBL_CALIPSO_C_ADD,
	.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
	.flags = GENL_ADMIN_PERM,
	.doit = netlbl_calipso_add,
	.dumpit = NULL,
	},
	{
	.cmd = NLBL_CALIPSO_C_REMOVE,
	.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
	.flags = GENL_ADMIN_PERM,
	.doit = netlbl_calipso_remove,
	.dumpit = NULL,
	},
	{
	.cmd = NLBL_CALIPSO_C_LIST,
	.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
	.flags = 0,
	.doit = netlbl_calipso_list,
	.dumpit = NULL,
	},
	{
	.cmd = NLBL_CALIPSO_C_LISTALL,
	.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
	.flags = 0,
	.doit = NULL,
	.dumpit = netlbl_calipso_listall,
	},
};

static struct genl_family netlbl_calipso_gnl_family __ro_after_init = {
	.hdrsize = 0,
	.name = NETLBL_NLTYPE_CALIPSO_NAME,
	.version = NETLBL_PROTO_VERSION,
	.maxattr = NLBL_CALIPSO_A_MAX,
	.policy = calipso_genl_policy,
	.module = THIS_MODULE,
	.small_ops = netlbl_calipso_ops,
	.n_small_ops = ARRAY_SIZE(netlbl_calipso_ops),
};

/* NetLabel Generic NETLINK Protocol Functions
 */

/**
 * netlbl_calipso_genl_init - Register the CALIPSO NetLabel component
 *
 * Description:
 * Register the CALIPSO packet NetLabel component with the Generic NETLINK
 * mechanism.  Returns zero on success, negative values on failure.
 *
 */
int __init netlbl_calipso_genl_init(void)
{
	return genl_register_family(&netlbl_calipso_gnl_family);
}

static const struct netlbl_calipso_ops *calipso_ops;

/**
 * netlbl_calipso_ops_register - Register the CALIPSO operations
 * @ops: ops to register
 *
 * Description:
 * Register the CALIPSO packet engine operations.
 *
 */
const struct netlbl_calipso_ops *
netlbl_calipso_ops_register(const struct netlbl_calipso_ops *ops)
{
	return xchg(&calipso_ops, ops);
}
EXPORT_SYMBOL(netlbl_calipso_ops_register);

static const struct netlbl_calipso_ops *netlbl_calipso_ops_get(void)
{
	return READ_ONCE(calipso_ops);
}

/**
 * calipso_doi_add - Add a new DOI to the CALIPSO protocol engine
 * @doi_def: the DOI structure
 * @audit_info: NetLabel audit information
 *
 * Description:
 * The caller defines a new DOI for use by the CALIPSO engine and calls this
 * function to add it to the list of acceptable domains.  The caller must
 * ensure that the mapping table specified in @doi_def->map meets all of the
 * requirements of the mapping type (see calipso.h for details).  Returns
 * zero on success and non-zero on failure.
 *
 */
int calipso_doi_add(struct calipso_doi *doi_def,
		    struct netlbl_audit *audit_info)
{
	int ret_val = -ENOMSG;
	const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();

	if (ops)
		ret_val = ops->doi_add(doi_def, audit_info);
	return ret_val;
}

/**
 * calipso_doi_free - Frees a DOI definition
 * @doi_def: the DOI definition
 *
 * Description:
 * This function frees all of the memory associated with a DOI definition.
 *
 */
void calipso_doi_free(struct calipso_doi *doi_def)
{
	const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();

	if (ops)
		ops->doi_free(doi_def);
}

/**
 * calipso_doi_remove - Remove an existing DOI from the CALIPSO protocol engine
 * @doi: the DOI value
 * @audit_info: NetLabel audit information
 *
 * Description:
 * Removes a DOI definition from the CALIPSO engine.  The NetLabel routines will
 * be called to release their own LSM domain mappings as well as our own
 * domain list.  Returns zero on success and negative values on failure.
 *
 */
int calipso_doi_remove(u32 doi, struct netlbl_audit *audit_info)
{
	int ret_val = -ENOMSG;
	const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();

	if (ops)
		ret_val = ops->doi_remove(doi, audit_info);
	return ret_val;
}

/**
 * calipso_doi_getdef - Returns a reference to a valid DOI definition
 * @doi: the DOI value
 *
 * Description:
 * Searches for a valid DOI definition and if one is found it is returned to
 * the caller.  Otherwise NULL is returned.  The caller must ensure that
 * calipso_doi_putdef() is called when the caller is done.
 *
 */
struct calipso_doi *calipso_doi_getdef(u32 doi)
{
	struct calipso_doi *ret_val = NULL;
	const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();

	if (ops)
		ret_val = ops->doi_getdef(doi);
	return ret_val;
}

/**
 * calipso_doi_putdef - Releases a reference for the given DOI definition
 * @doi_def: the DOI definition
 *
 * Description:
 * Releases a DOI definition reference obtained from calipso_doi_getdef().
 *
 */
void calipso_doi_putdef(struct calipso_doi *doi_def)
{
	const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();

	if (ops)
		ops->doi_putdef(doi_def);
}

/**
 * calipso_doi_walk - Iterate through the DOI definitions
 * @skip_cnt: skip past this number of DOI definitions, updated
 * @callback: callback for each DOI definition
 * @cb_arg: argument for the callback function
 *
 * Description:
 * Iterate over the DOI definition list, skipping the first @skip_cnt entries.
 * For each entry call @callback, if @callback returns a negative value stop
 * 'walking' through the list and return.  Updates the value in @skip_cnt upon
 * return.  Returns zero on success, negative values on failure.
 *
 */
int calipso_doi_walk(u32 *skip_cnt,
		     int (*callback)(struct calipso_doi *doi_def, void *arg),
		     void *cb_arg)
{
	int ret_val = -ENOMSG;
	const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();

	if (ops)
		ret_val = ops->doi_walk(skip_cnt, callback, cb_arg);
	return ret_val;
}

/**
 * calipso_sock_getattr - Get the security attributes from a sock
 * @sk: the sock
 * @secattr: the security attributes
 *
 * Description:
 * Query @sk to see if there is a CALIPSO option attached to the sock and if
 * there is return the CALIPSO security attributes in @secattr.  This function
 * requires that @sk be locked, or privately held, but it does not do any
 * locking itself.  Returns zero on success and negative values on failure.
 *
 */
int calipso_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr)
{
	int ret_val = -ENOMSG;
	const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();

	if (ops)
		ret_val = ops->sock_getattr(sk, secattr);
	return ret_val;
}

/**
 * calipso_sock_setattr - Add a CALIPSO option to a socket
 * @sk: the socket
 * @doi_def: the CALIPSO DOI to use
 * @secattr: the specific security attributes of the socket
 *
 * Description:
 * Set the CALIPSO option on the given socket using the DOI definition and
 * security attributes passed to the function.  This function requires
 * exclusive access to @sk, which means it either needs to be in the
 * process of being created or locked.  Returns zero on success and negative
 * values on failure.
 *
 */
int calipso_sock_setattr(struct sock *sk,
			 const struct calipso_doi *doi_def,
			 const struct netlbl_lsm_secattr *secattr)
{
	int ret_val = -ENOMSG;
	const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();

	if (ops)
		ret_val = ops->sock_setattr(sk, doi_def, secattr);
	return ret_val;
}

/**
 * calipso_sock_delattr - Delete the CALIPSO option from a socket
 * @sk: the socket
 *
 * Description:
 * Removes the CALIPSO option from a socket, if present.
 *
 */
void calipso_sock_delattr(struct sock *sk)
{
	const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();

	if (ops)
		ops->sock_delattr(sk);
}

/**
 * calipso_req_setattr - Add a CALIPSO option to a connection request socket
 * @req: the connection request socket
 * @doi_def: the CALIPSO DOI to use
 * @secattr: the specific security attributes of the socket
 *
 * Description:
 * Set the CALIPSO option on the given socket using the DOI definition and
 * security attributes passed to the function.  Returns zero on success and
 * negative values on failure.
 *
 */
int calipso_req_setattr(struct request_sock *req,
			const struct calipso_doi *doi_def,
			const struct netlbl_lsm_secattr *secattr)
{
	int ret_val = -ENOMSG;
	const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();

	if (ops)
		ret_val = ops->req_setattr(req, doi_def, secattr);
	return ret_val;
}

/**
 * calipso_req_delattr - Delete the CALIPSO option from a request socket
 * @req: the request socket
 *
 * Description:
 * Removes the CALIPSO option from a request socket, if present.
 *
 */
void calipso_req_delattr(struct request_sock *req)
{
	const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();

	if (ops)
		ops->req_delattr(req);
}

/**
 * calipso_optptr - Find the CALIPSO option in the packet
 * @skb: the packet
 *
 * Description:
 * Parse the packet's IP header looking for a CALIPSO option.  Returns a pointer
 * to the start of the CALIPSO option on success, NULL if one if not found.
 *
 */
unsigned char *calipso_optptr(const struct sk_buff *skb)
{
	unsigned char *ret_val = NULL;
	const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();

	if (ops)
		ret_val = ops->skbuff_optptr(skb);
	return ret_val;
}

/**
 * calipso_getattr - Get the security attributes from a memory block.
 * @calipso: the CALIPSO option
 * @secattr: the security attributes
 *
 * Description:
 * Inspect @calipso and return the security attributes in @secattr.
 * Returns zero on success and negative values on failure.
 *
 */
int calipso_getattr(const unsigned char *calipso,
		    struct netlbl_lsm_secattr *secattr)
{
	int ret_val = -ENOMSG;
	const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();

	if (ops)
		ret_val = ops->opt_getattr(calipso, secattr);
	return ret_val;
}

/**
 * calipso_skbuff_setattr - Set the CALIPSO option on a packet
 * @skb: the packet
 * @doi_def: the CALIPSO DOI to use
 * @secattr: the security attributes
 *
 * Description:
 * Set the CALIPSO option on the given packet based on the security attributes.
 * Returns a pointer to the IP header on success and NULL on failure.
 *
 */
int calipso_skbuff_setattr(struct sk_buff *skb,
			   const struct calipso_doi *doi_def,
			   const struct netlbl_lsm_secattr *secattr)
{
	int ret_val = -ENOMSG;
	const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();

	if (ops)
		ret_val = ops->skbuff_setattr(skb, doi_def, secattr);
	return ret_val;
}

/**
 * calipso_skbuff_delattr - Delete any CALIPSO options from a packet
 * @skb: the packet
 *
 * Description:
 * Removes any and all CALIPSO options from the given packet.  Returns zero on
 * success, negative values on failure.
 *
 */
int calipso_skbuff_delattr(struct sk_buff *skb)
{
	int ret_val = -ENOMSG;
	const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();

	if (ops)
		ret_val = ops->skbuff_delattr(skb);
	return ret_val;
}

/**
 * calipso_cache_invalidate - Invalidates the current CALIPSO cache
 *
 * Description:
 * Invalidates and frees any entries in the CALIPSO cache.  Returns zero on
 * success and negative values on failure.
 *
 */
void calipso_cache_invalidate(void)
{
	const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();

	if (ops)
		ops->cache_invalidate();
}

/**
 * calipso_cache_add - Add an entry to the CALIPSO cache
 * @calipso_ptr: the CALIPSO option
 * @secattr: the packet's security attributes
 *
 * Description:
 * Add a new entry into the CALIPSO label mapping cache.
 * Returns zero on success, negative values on failure.
 *
 */
int calipso_cache_add(const unsigned char *calipso_ptr,
		      const struct netlbl_lsm_secattr *secattr)

{
	int ret_val = -ENOMSG;
	const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();

	if (ops)
		ret_val = ops->cache_add(calipso_ptr, secattr);
	return ret_val;
}