summaryrefslogtreecommitdiffstats
path: root/drivers/infiniband/core/security.c
blob: feafdb961c485c61e3842d6a946d83b1bf7176b8 (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
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
/*
 * Copyright (c) 2016 Mellanox Technologies Ltd.  All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#ifdef CONFIG_SECURITY_INFINIBAND

#include <linux/security.h>
#include <linux/completion.h>
#include <linux/list.h>

#include <rdma/ib_verbs.h>
#include <rdma/ib_cache.h>
#include "core_priv.h"
#include "mad_priv.h"

static struct pkey_index_qp_list *get_pkey_idx_qp_list(struct ib_port_pkey *pp)
{
	struct pkey_index_qp_list *pkey = NULL;
	struct pkey_index_qp_list *tmp_pkey;
	struct ib_device *dev = pp->sec->dev;

	spin_lock(&dev->port_pkey_list[pp->port_num].list_lock);
	list_for_each_entry(tmp_pkey,
			    &dev->port_pkey_list[pp->port_num].pkey_list,
			    pkey_index_list) {
		if (tmp_pkey->pkey_index == pp->pkey_index) {
			pkey = tmp_pkey;
			break;
		}
	}
	spin_unlock(&dev->port_pkey_list[pp->port_num].list_lock);
	return pkey;
}

static int get_pkey_and_subnet_prefix(struct ib_port_pkey *pp,
				      u16 *pkey,
				      u64 *subnet_prefix)
{
	struct ib_device *dev = pp->sec->dev;
	int ret;

	ret = ib_get_cached_pkey(dev, pp->port_num, pp->pkey_index, pkey);
	if (ret)
		return ret;

	ret = ib_get_cached_subnet_prefix(dev, pp->port_num, subnet_prefix);

	return ret;
}

static int enforce_qp_pkey_security(u16 pkey,
				    u64 subnet_prefix,
				    struct ib_qp_security *qp_sec)
{
	struct ib_qp_security *shared_qp_sec;
	int ret;

	ret = security_ib_pkey_access(qp_sec->security, subnet_prefix, pkey);
	if (ret)
		return ret;

	list_for_each_entry(shared_qp_sec,
			    &qp_sec->shared_qp_list,
			    shared_qp_list) {
		ret = security_ib_pkey_access(shared_qp_sec->security,
					      subnet_prefix,
					      pkey);
		if (ret)
			return ret;
	}
	return 0;
}

/* The caller of this function must hold the QP security
 * mutex of the QP of the security structure in *pps.
 *
 * It takes separate ports_pkeys and security structure
 * because in some cases the pps will be for a new settings
 * or the pps will be for the real QP and security structure
 * will be for a shared QP.
 */
static int check_qp_port_pkey_settings(struct ib_ports_pkeys *pps,
				       struct ib_qp_security *sec)
{
	u64 subnet_prefix;
	u16 pkey;
	int ret = 0;

	if (!pps)
		return 0;

	if (pps->main.state != IB_PORT_PKEY_NOT_VALID) {
		ret = get_pkey_and_subnet_prefix(&pps->main,
						 &pkey,
						 &subnet_prefix);
		if (ret)
			return ret;

		ret = enforce_qp_pkey_security(pkey,
					       subnet_prefix,
					       sec);
		if (ret)
			return ret;
	}

	if (pps->alt.state != IB_PORT_PKEY_NOT_VALID) {
		ret = get_pkey_and_subnet_prefix(&pps->alt,
						 &pkey,
						 &subnet_prefix);
		if (ret)
			return ret;

		ret = enforce_qp_pkey_security(pkey,
					       subnet_prefix,
					       sec);
	}

	return ret;
}

/* The caller of this function must hold the QP security
 * mutex.
 */
static void qp_to_error(struct ib_qp_security *sec)
{
	struct ib_qp_security *shared_qp_sec;
	struct ib_qp_attr attr = {
		.qp_state = IB_QPS_ERR
	};
	struct ib_event event = {
		.event = IB_EVENT_QP_FATAL
	};

	/* If the QP is in the process of being destroyed
	 * the qp pointer in the security structure is
	 * undefined.  It cannot be modified now.
	 */
	if (sec->destroying)
		return;

	ib_modify_qp(sec->qp,
		     &attr,
		     IB_QP_STATE);

	if (sec->qp->event_handler && sec->qp->qp_context) {
		event.element.qp = sec->qp;
		sec->qp->event_handler(&event,
				       sec->qp->qp_context);
	}

	list_for_each_entry(shared_qp_sec,
			    &sec->shared_qp_list,
			    shared_qp_list) {
		struct ib_qp *qp = shared_qp_sec->qp;

		if (qp->event_handler && qp->qp_context) {
			event.element.qp = qp;
			event.device = qp->device;
			qp->event_handler(&event,
					  qp->qp_context);
		}
	}
}

static inline void check_pkey_qps(struct pkey_index_qp_list *pkey,
				  struct ib_device *device,
				  u8 port_num,
				  u64 subnet_prefix)
{
	struct ib_port_pkey *pp, *tmp_pp;
	bool comp;
	LIST_HEAD(to_error_list);
	u16 pkey_val;

	if (!ib_get_cached_pkey(device,
				port_num,
				pkey->pkey_index,
				&pkey_val)) {
		spin_lock(&pkey->qp_list_lock);
		list_for_each_entry(pp, &pkey->qp_list, qp_list) {
			if (atomic_read(&pp->sec->error_list_count))
				continue;

			if (enforce_qp_pkey_security(pkey_val,
						     subnet_prefix,
						     pp->sec)) {
				atomic_inc(&pp->sec->error_list_count);
				list_add(&pp->to_error_list,
					 &to_error_list);
			}
		}
		spin_unlock(&pkey->qp_list_lock);
	}

	list_for_each_entry_safe(pp,
				 tmp_pp,
				 &to_error_list,
				 to_error_list) {
		mutex_lock(&pp->sec->mutex);
		qp_to_error(pp->sec);
		list_del(&pp->to_error_list);
		atomic_dec(&pp->sec->error_list_count);
		comp = pp->sec->destroying;
		mutex_unlock(&pp->sec->mutex);

		if (comp)
			complete(&pp->sec->error_complete);
	}
}

/* The caller of this function must hold the QP security
 * mutex.
 */
static int port_pkey_list_insert(struct ib_port_pkey *pp)
{
	struct pkey_index_qp_list *tmp_pkey;
	struct pkey_index_qp_list *pkey;
	struct ib_device *dev;
	u8 port_num = pp->port_num;
	int ret = 0;

	if (pp->state != IB_PORT_PKEY_VALID)
		return 0;

	dev = pp->sec->dev;

	pkey = get_pkey_idx_qp_list(pp);

	if (!pkey) {
		bool found = false;

		pkey = kzalloc(sizeof(*pkey), GFP_KERNEL);
		if (!pkey)
			return -ENOMEM;

		spin_lock(&dev->port_pkey_list[port_num].list_lock);
		/* Check for the PKey again.  A racing process may
		 * have created it.
		 */
		list_for_each_entry(tmp_pkey,
				    &dev->port_pkey_list[port_num].pkey_list,
				    pkey_index_list) {
			if (tmp_pkey->pkey_index == pp->pkey_index) {
				kfree(pkey);
				pkey = tmp_pkey;
				found = true;
				break;
			}
		}

		if (!found) {
			pkey->pkey_index = pp->pkey_index;
			spin_lock_init(&pkey->qp_list_lock);
			INIT_LIST_HEAD(&pkey->qp_list);
			list_add(&pkey->pkey_index_list,
				 &dev->port_pkey_list[port_num].pkey_list);
		}
		spin_unlock(&dev->port_pkey_list[port_num].list_lock);
	}

	spin_lock(&pkey->qp_list_lock);
	list_add(&pp->qp_list, &pkey->qp_list);
	spin_unlock(&pkey->qp_list_lock);

	pp->state = IB_PORT_PKEY_LISTED;

	return ret;
}

/* The caller of this function must hold the QP security
 * mutex.
 */
static void port_pkey_list_remove(struct ib_port_pkey *pp)
{
	struct pkey_index_qp_list *pkey;

	if (pp->state != IB_PORT_PKEY_LISTED)
		return;

	pkey = get_pkey_idx_qp_list(pp);

	spin_lock(&pkey->qp_list_lock);
	list_del(&pp->qp_list);
	spin_unlock(&pkey->qp_list_lock);

	/* The setting may still be valid, i.e. after
	 * a destroy has failed for example.
	 */
	pp->state = IB_PORT_PKEY_VALID;
}

static void destroy_qp_security(struct ib_qp_security *sec)
{
	security_ib_free_security(sec->security);
	kfree(sec->ports_pkeys);
	kfree(sec);
}

/* The caller of this function must hold the QP security
 * mutex.
 */
static struct ib_ports_pkeys *get_new_pps(const struct ib_qp *qp,
					  const struct ib_qp_attr *qp_attr,
					  int qp_attr_mask)
{
	struct ib_ports_pkeys *new_pps;
	struct ib_ports_pkeys *qp_pps = qp->qp_sec->ports_pkeys;

	new_pps = kzalloc(sizeof(*new_pps), GFP_KERNEL);
	if (!new_pps)
		return NULL;

	if (qp_attr_mask & (IB_QP_PKEY_INDEX | IB_QP_PORT)) {
		if (!qp_pps) {
			new_pps->main.port_num = qp_attr->port_num;
			new_pps->main.pkey_index = qp_attr->pkey_index;
		} else {
			new_pps->main.port_num = (qp_attr_mask & IB_QP_PORT) ?
						  qp_attr->port_num :
						  qp_pps->main.port_num;

			new_pps->main.pkey_index =
					(qp_attr_mask & IB_QP_PKEY_INDEX) ?
					 qp_attr->pkey_index :
					 qp_pps->main.pkey_index;
		}
		new_pps->main.state = IB_PORT_PKEY_VALID;
	} else if (qp_pps) {
		new_pps->main.port_num = qp_pps->main.port_num;
		new_pps->main.pkey_index = qp_pps->main.pkey_index;
		if (qp_pps->main.state != IB_PORT_PKEY_NOT_VALID)
			new_pps->main.state = IB_PORT_PKEY_VALID;
	}

	if (qp_attr_mask & IB_QP_ALT_PATH) {
		new_pps->alt.port_num = qp_attr->alt_port_num;
		new_pps->alt.pkey_index = qp_attr->alt_pkey_index;
		new_pps->alt.state = IB_PORT_PKEY_VALID;
	} else if (qp_pps) {
		new_pps->alt.port_num = qp_pps->alt.port_num;
		new_pps->alt.pkey_index = qp_pps->alt.pkey_index;
		if (qp_pps->alt.state != IB_PORT_PKEY_NOT_VALID)
			new_pps->alt.state = IB_PORT_PKEY_VALID;
	}

	new_pps->main.sec = qp->qp_sec;
	new_pps->alt.sec = qp->qp_sec;
	return new_pps;
}

int ib_open_shared_qp_security(struct ib_qp *qp, struct ib_device *dev)
{
	struct ib_qp *real_qp = qp->real_qp;
	int ret;

	ret = ib_create_qp_security(qp, dev);

	if (ret)
		return ret;

	mutex_lock(&real_qp->qp_sec->mutex);
	ret = check_qp_port_pkey_settings(real_qp->qp_sec->ports_pkeys,
					  qp->qp_sec);

	if (ret)
		goto ret;

	if (qp != real_qp)
		list_add(&qp->qp_sec->shared_qp_list,
			 &real_qp->qp_sec->shared_qp_list);
ret:
	mutex_unlock(&real_qp->qp_sec->mutex);
	if (ret)
		destroy_qp_security(qp->qp_sec);

	return ret;
}

void ib_close_shared_qp_security(struct ib_qp_security *sec)
{
	struct ib_qp *real_qp = sec->qp->real_qp;

	mutex_lock(&real_qp->qp_sec->mutex);
	list_del(&sec->shared_qp_list);
	mutex_unlock(&real_qp->qp_sec->mutex);

	destroy_qp_security(sec);
}

int ib_create_qp_security(struct ib_qp *qp, struct ib_device *dev)
{
	u8 i = rdma_start_port(dev);
	bool is_ib = false;
	int ret;

	while (i <= rdma_end_port(dev) && !is_ib)
		is_ib = rdma_protocol_ib(dev, i++);

	/* If this isn't an IB device don't create the security context */
	if (!is_ib)
		return 0;

	qp->qp_sec = kzalloc(sizeof(*qp->qp_sec), GFP_KERNEL);
	if (!qp->qp_sec)
		return -ENOMEM;

	qp->qp_sec->qp = qp;
	qp->qp_sec->dev = dev;
	mutex_init(&qp->qp_sec->mutex);
	INIT_LIST_HEAD(&qp->qp_sec->shared_qp_list);
	atomic_set(&qp->qp_sec->error_list_count, 0);
	init_completion(&qp->qp_sec->error_complete);
	ret = security_ib_alloc_security(&qp->qp_sec->security);
	if (ret) {
		kfree(qp->qp_sec);
		qp->qp_sec = NULL;
	}

	return ret;
}
EXPORT_SYMBOL(ib_create_qp_security);

void ib_destroy_qp_security_begin(struct ib_qp_security *sec)
{
	/* Return if not IB */
	if (!sec)
		return;

	mutex_lock(&sec->mutex);

	/* Remove the QP from the lists so it won't get added to
	 * a to_error_list during the destroy process.
	 */
	if (sec->ports_pkeys) {
		port_pkey_list_remove(&sec->ports_pkeys->main);
		port_pkey_list_remove(&sec->ports_pkeys->alt);
	}

	/* If the QP is already in one or more of those lists
	 * the destroying flag will ensure the to error flow
	 * doesn't operate on an undefined QP.
	 */
	sec->destroying = true;

	/* Record the error list count to know how many completions
	 * to wait for.
	 */
	sec->error_comps_pending = atomic_read(&sec->error_list_count);

	mutex_unlock(&sec->mutex);
}

void ib_destroy_qp_security_abort(struct ib_qp_security *sec)
{
	int ret;
	int i;

	/* Return if not IB */
	if (!sec)
		return;

	/* If a concurrent cache update is in progress this
	 * QP security could be marked for an error state
	 * transition.  Wait for this to complete.
	 */
	for (i = 0; i < sec->error_comps_pending; i++)
		wait_for_completion(&sec->error_complete);

	mutex_lock(&sec->mutex);
	sec->destroying = false;

	/* Restore the position in the lists and verify
	 * access is still allowed in case a cache update
	 * occurred while attempting to destroy.
	 *
	 * Because these setting were listed already
	 * and removed during ib_destroy_qp_security_begin
	 * we know the pkey_index_qp_list for the PKey
	 * already exists so port_pkey_list_insert won't fail.
	 */
	if (sec->ports_pkeys) {
		port_pkey_list_insert(&sec->ports_pkeys->main);
		port_pkey_list_insert(&sec->ports_pkeys->alt);
	}

	ret = check_qp_port_pkey_settings(sec->ports_pkeys, sec);
	if (ret)
		qp_to_error(sec);

	mutex_unlock(&sec->mutex);
}

void ib_destroy_qp_security_end(struct ib_qp_security *sec)
{
	int i;

	/* Return if not IB */
	if (!sec)
		return;

	/* If a concurrent cache update is occurring we must
	 * wait until this QP security structure is processed
	 * in the QP to error flow before destroying it because
	 * the to_error_list is in use.
	 */
	for (i = 0; i < sec->error_comps_pending; i++)
		wait_for_completion(&sec->error_complete);

	destroy_qp_security(sec);
}

void ib_security_cache_change(struct ib_device *device,
			      u8 port_num,
			      u64 subnet_prefix)
{
	struct pkey_index_qp_list *pkey;

	list_for_each_entry(pkey,
			    &device->port_pkey_list[port_num].pkey_list,
			    pkey_index_list) {
		check_pkey_qps(pkey,
			       device,
			       port_num,
			       subnet_prefix);
	}
}

void ib_security_destroy_port_pkey_list(struct ib_device *device)
{
	struct pkey_index_qp_list *pkey, *tmp_pkey;
	int i;

	for (i = rdma_start_port(device); i <= rdma_end_port(device); i++) {
		spin_lock(&device->port_pkey_list[i].list_lock);
		list_for_each_entry_safe(pkey,
					 tmp_pkey,
					 &device->port_pkey_list[i].pkey_list,
					 pkey_index_list) {
			list_del(&pkey->pkey_index_list);
			kfree(pkey);
		}
		spin_unlock(&device->port_pkey_list[i].list_lock);
	}
}

int ib_security_modify_qp(struct ib_qp *qp,
			  struct ib_qp_attr *qp_attr,
			  int qp_attr_mask,
			  struct ib_udata *udata)
{
	int ret = 0;
	struct ib_ports_pkeys *tmp_pps;
	struct ib_ports_pkeys *new_pps = NULL;
	struct ib_qp *real_qp = qp->real_qp;
	bool special_qp = (real_qp->qp_type == IB_QPT_SMI ||
			   real_qp->qp_type == IB_QPT_GSI ||
			   real_qp->qp_type >= IB_QPT_RESERVED1);
	bool pps_change = ((qp_attr_mask & (IB_QP_PKEY_INDEX | IB_QP_PORT)) ||
			   (qp_attr_mask & IB_QP_ALT_PATH));

	WARN_ONCE((qp_attr_mask & IB_QP_PORT &&
		   rdma_protocol_ib(real_qp->device, qp_attr->port_num) &&
		   !real_qp->qp_sec),
		   "%s: QP security is not initialized for IB QP: %d\n",
		   __func__, real_qp->qp_num);

	/* The port/pkey settings are maintained only for the real QP. Open
	 * handles on the real QP will be in the shared_qp_list. When
	 * enforcing security on the real QP all the shared QPs will be
	 * checked as well.
	 */

	if (pps_change && !special_qp && real_qp->qp_sec) {
		mutex_lock(&real_qp->qp_sec->mutex);
		new_pps = get_new_pps(real_qp,
				      qp_attr,
				      qp_attr_mask);
		if (!new_pps) {
			mutex_unlock(&real_qp->qp_sec->mutex);
			return -ENOMEM;
		}
		/* Add this QP to the lists for the new port
		 * and pkey settings before checking for permission
		 * in case there is a concurrent cache update
		 * occurring.  Walking the list for a cache change
		 * doesn't acquire the security mutex unless it's
		 * sending the QP to error.
		 */
		ret = port_pkey_list_insert(&new_pps->main);

		if (!ret)
			ret = port_pkey_list_insert(&new_pps->alt);

		if (!ret)
			ret = check_qp_port_pkey_settings(new_pps,
							  real_qp->qp_sec);
	}

	if (!ret)
		ret = real_qp->device->modify_qp(real_qp,
						 qp_attr,
						 qp_attr_mask,
						 udata);

	if (new_pps) {
		/* Clean up the lists and free the appropriate
		 * ports_pkeys structure.
		 */
		if (ret) {
			tmp_pps = new_pps;
		} else {
			tmp_pps = real_qp->qp_sec->ports_pkeys;
			real_qp->qp_sec->ports_pkeys = new_pps;
		}

		if (tmp_pps) {
			port_pkey_list_remove(&tmp_pps->main);
			port_pkey_list_remove(&tmp_pps->alt);
		}
		kfree(tmp_pps);
		mutex_unlock(&real_qp->qp_sec->mutex);
	}
	return ret;
}
EXPORT_SYMBOL(ib_security_modify_qp);

int ib_security_pkey_access(struct ib_device *dev,
			    u8 port_num,
			    u16 pkey_index,
			    void *sec)
{
	u64 subnet_prefix;
	u16 pkey;
	int ret;

	if (!rdma_protocol_ib(dev, port_num))
		return 0;

	ret = ib_get_cached_pkey(dev, port_num, pkey_index, &pkey);
	if (ret)
		return ret;

	ret = ib_get_cached_subnet_prefix(dev, port_num, &subnet_prefix);

	if (ret)
		return ret;

	return security_ib_pkey_access(sec, subnet_prefix, pkey);
}
EXPORT_SYMBOL(ib_security_pkey_access);

static int ib_mad_agent_security_change(struct notifier_block *nb,
					unsigned long event,
					void *data)
{
	struct ib_mad_agent *ag = container_of(nb, struct ib_mad_agent, lsm_nb);

	if (event != LSM_POLICY_CHANGE)
		return NOTIFY_DONE;

	ag->smp_allowed = !security_ib_endport_manage_subnet(ag->security,
							     ag->device->name,
							     ag->port_num);

	return NOTIFY_OK;
}

int ib_mad_agent_security_setup(struct ib_mad_agent *agent,
				enum ib_qp_type qp_type)
{
	int ret;

	if (!rdma_protocol_ib(agent->device, agent->port_num))
		return 0;

	ret = security_ib_alloc_security(&agent->security);
	if (ret)
		return ret;

	if (qp_type != IB_QPT_SMI)
		return 0;

	ret = security_ib_endport_manage_subnet(agent->security,
						agent->device->name,
						agent->port_num);
	if (ret)
		return ret;

	agent->lsm_nb.notifier_call = ib_mad_agent_security_change;
	ret = register_lsm_notifier(&agent->lsm_nb);
	if (ret)
		return ret;

	agent->smp_allowed = true;
	agent->lsm_nb_reg = true;
	return 0;
}

void ib_mad_agent_security_cleanup(struct ib_mad_agent *agent)
{
	if (!rdma_protocol_ib(agent->device, agent->port_num))
		return;

	security_ib_free_security(agent->security);
	if (agent->lsm_nb_reg)
		unregister_lsm_notifier(&agent->lsm_nb);
}

int ib_mad_enforce_security(struct ib_mad_agent_private *map, u16 pkey_index)
{
	if (!rdma_protocol_ib(map->agent.device, map->agent.port_num))
		return 0;

	if (map->agent.qp->qp_type == IB_QPT_SMI) {
		if (!map->agent.smp_allowed)
			return -EACCES;
		return 0;
	}

	return ib_security_pkey_access(map->agent.device,
				       map->agent.port_num,
				       pkey_index,
				       map->agent.security);
}

#endif /* CONFIG_SECURITY_INFINIBAND */