1 /*
2  * Copyright (c) 2016 Mellanox Technologies Ltd.  All rights reserved.
3  *
4  * This software is available to you under a choice of one of two
5  * licenses.  You may choose to be licensed under the terms of the GNU
6  * General Public License (GPL) Version 2, available from the file
7  * COPYING in the main directory of this source tree, or the
8  * OpenIB.org BSD license below:
9  *
10  *     Redistribution and use in source and binary forms, with or
11  *     without modification, are permitted provided that the following
12  *     conditions are met:
13  *
14  *      - Redistributions of source code must retain the above
15  *        copyright notice, this list of conditions and the following
16  *        disclaimer.
17  *
18  *      - Redistributions in binary form must reproduce the above
19  *        copyright notice, this list of conditions and the following
20  *        disclaimer in the documentation and/or other materials
21  *        provided with the distribution.
22  *
23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30  * SOFTWARE.
31  */
32 
33 #include <linux/security.h>
34 #include <linux/completion.h>
35 #include <linux/list.h>
36 
37 #include <rdma/ib_verbs.h>
38 #include <rdma/ib_cache.h>
39 #include "core_priv.h"
40 #include "mad_priv.h"
41 
42 static LIST_HEAD(mad_agent_list);
43 /* Lock to protect mad_agent_list */
44 static DEFINE_SPINLOCK(mad_agent_list_lock);
45 
46 static struct pkey_index_qp_list *get_pkey_idx_qp_list(struct ib_port_pkey *pp)
47 {
48 	struct pkey_index_qp_list *pkey = NULL;
49 	struct pkey_index_qp_list *tmp_pkey;
50 	struct ib_device *dev = pp->sec->dev;
51 
52 	spin_lock(&dev->port_data[pp->port_num].pkey_list_lock);
53 	list_for_each_entry (tmp_pkey, &dev->port_data[pp->port_num].pkey_list,
54 			     pkey_index_list) {
55 		if (tmp_pkey->pkey_index == pp->pkey_index) {
56 			pkey = tmp_pkey;
57 			break;
58 		}
59 	}
60 	spin_unlock(&dev->port_data[pp->port_num].pkey_list_lock);
61 	return pkey;
62 }
63 
64 static int get_pkey_and_subnet_prefix(struct ib_port_pkey *pp,
65 				      u16 *pkey,
66 				      u64 *subnet_prefix)
67 {
68 	struct ib_device *dev = pp->sec->dev;
69 	int ret;
70 
71 	ret = ib_get_cached_pkey(dev, pp->port_num, pp->pkey_index, pkey);
72 	if (ret)
73 		return ret;
74 
75 	ret = ib_get_cached_subnet_prefix(dev, pp->port_num, subnet_prefix);
76 
77 	return ret;
78 }
79 
80 static int enforce_qp_pkey_security(u16 pkey,
81 				    u64 subnet_prefix,
82 				    struct ib_qp_security *qp_sec)
83 {
84 	struct ib_qp_security *shared_qp_sec;
85 	int ret;
86 
87 	ret = security_ib_pkey_access(qp_sec->security, subnet_prefix, pkey);
88 	if (ret)
89 		return ret;
90 
91 	list_for_each_entry(shared_qp_sec,
92 			    &qp_sec->shared_qp_list,
93 			    shared_qp_list) {
94 		ret = security_ib_pkey_access(shared_qp_sec->security,
95 					      subnet_prefix,
96 					      pkey);
97 		if (ret)
98 			return ret;
99 	}
100 	return 0;
101 }
102 
103 /* The caller of this function must hold the QP security
104  * mutex of the QP of the security structure in *pps.
105  *
106  * It takes separate ports_pkeys and security structure
107  * because in some cases the pps will be for a new settings
108  * or the pps will be for the real QP and security structure
109  * will be for a shared QP.
110  */
111 static int check_qp_port_pkey_settings(struct ib_ports_pkeys *pps,
112 				       struct ib_qp_security *sec)
113 {
114 	u64 subnet_prefix;
115 	u16 pkey;
116 	int ret = 0;
117 
118 	if (!pps)
119 		return 0;
120 
121 	if (pps->main.state != IB_PORT_PKEY_NOT_VALID) {
122 		ret = get_pkey_and_subnet_prefix(&pps->main,
123 						 &pkey,
124 						 &subnet_prefix);
125 		if (ret)
126 			return ret;
127 
128 		ret = enforce_qp_pkey_security(pkey,
129 					       subnet_prefix,
130 					       sec);
131 		if (ret)
132 			return ret;
133 	}
134 
135 	if (pps->alt.state != IB_PORT_PKEY_NOT_VALID) {
136 		ret = get_pkey_and_subnet_prefix(&pps->alt,
137 						 &pkey,
138 						 &subnet_prefix);
139 		if (ret)
140 			return ret;
141 
142 		ret = enforce_qp_pkey_security(pkey,
143 					       subnet_prefix,
144 					       sec);
145 	}
146 
147 	return ret;
148 }
149 
150 /* The caller of this function must hold the QP security
151  * mutex.
152  */
153 static void qp_to_error(struct ib_qp_security *sec)
154 {
155 	struct ib_qp_security *shared_qp_sec;
156 	struct ib_qp_attr attr = {
157 		.qp_state = IB_QPS_ERR
158 	};
159 	struct ib_event event = {
160 		.event = IB_EVENT_QP_FATAL
161 	};
162 
163 	/* If the QP is in the process of being destroyed
164 	 * the qp pointer in the security structure is
165 	 * undefined.  It cannot be modified now.
166 	 */
167 	if (sec->destroying)
168 		return;
169 
170 	ib_modify_qp(sec->qp,
171 		     &attr,
172 		     IB_QP_STATE);
173 
174 	if (sec->qp->event_handler && sec->qp->qp_context) {
175 		event.element.qp = sec->qp;
176 		sec->qp->event_handler(&event,
177 				       sec->qp->qp_context);
178 	}
179 
180 	list_for_each_entry(shared_qp_sec,
181 			    &sec->shared_qp_list,
182 			    shared_qp_list) {
183 		struct ib_qp *qp = shared_qp_sec->qp;
184 
185 		if (qp->event_handler && qp->qp_context) {
186 			event.element.qp = qp;
187 			event.device = qp->device;
188 			qp->event_handler(&event,
189 					  qp->qp_context);
190 		}
191 	}
192 }
193 
194 static inline void check_pkey_qps(struct pkey_index_qp_list *pkey,
195 				  struct ib_device *device,
196 				  u8 port_num,
197 				  u64 subnet_prefix)
198 {
199 	struct ib_port_pkey *pp, *tmp_pp;
200 	bool comp;
201 	LIST_HEAD(to_error_list);
202 	u16 pkey_val;
203 
204 	if (!ib_get_cached_pkey(device,
205 				port_num,
206 				pkey->pkey_index,
207 				&pkey_val)) {
208 		spin_lock(&pkey->qp_list_lock);
209 		list_for_each_entry(pp, &pkey->qp_list, qp_list) {
210 			if (atomic_read(&pp->sec->error_list_count))
211 				continue;
212 
213 			if (enforce_qp_pkey_security(pkey_val,
214 						     subnet_prefix,
215 						     pp->sec)) {
216 				atomic_inc(&pp->sec->error_list_count);
217 				list_add(&pp->to_error_list,
218 					 &to_error_list);
219 			}
220 		}
221 		spin_unlock(&pkey->qp_list_lock);
222 	}
223 
224 	list_for_each_entry_safe(pp,
225 				 tmp_pp,
226 				 &to_error_list,
227 				 to_error_list) {
228 		mutex_lock(&pp->sec->mutex);
229 		qp_to_error(pp->sec);
230 		list_del(&pp->to_error_list);
231 		atomic_dec(&pp->sec->error_list_count);
232 		comp = pp->sec->destroying;
233 		mutex_unlock(&pp->sec->mutex);
234 
235 		if (comp)
236 			complete(&pp->sec->error_complete);
237 	}
238 }
239 
240 /* The caller of this function must hold the QP security
241  * mutex.
242  */
243 static int port_pkey_list_insert(struct ib_port_pkey *pp)
244 {
245 	struct pkey_index_qp_list *tmp_pkey;
246 	struct pkey_index_qp_list *pkey;
247 	struct ib_device *dev;
248 	u8 port_num = pp->port_num;
249 	int ret = 0;
250 
251 	if (pp->state != IB_PORT_PKEY_VALID)
252 		return 0;
253 
254 	dev = pp->sec->dev;
255 
256 	pkey = get_pkey_idx_qp_list(pp);
257 
258 	if (!pkey) {
259 		bool found = false;
260 
261 		pkey = kzalloc(sizeof(*pkey), GFP_KERNEL);
262 		if (!pkey)
263 			return -ENOMEM;
264 
265 		spin_lock(&dev->port_data[port_num].pkey_list_lock);
266 		/* Check for the PKey again.  A racing process may
267 		 * have created it.
268 		 */
269 		list_for_each_entry(tmp_pkey,
270 				    &dev->port_data[port_num].pkey_list,
271 				    pkey_index_list) {
272 			if (tmp_pkey->pkey_index == pp->pkey_index) {
273 				kfree(pkey);
274 				pkey = tmp_pkey;
275 				found = true;
276 				break;
277 			}
278 		}
279 
280 		if (!found) {
281 			pkey->pkey_index = pp->pkey_index;
282 			spin_lock_init(&pkey->qp_list_lock);
283 			INIT_LIST_HEAD(&pkey->qp_list);
284 			list_add(&pkey->pkey_index_list,
285 				 &dev->port_data[port_num].pkey_list);
286 		}
287 		spin_unlock(&dev->port_data[port_num].pkey_list_lock);
288 	}
289 
290 	spin_lock(&pkey->qp_list_lock);
291 	list_add(&pp->qp_list, &pkey->qp_list);
292 	spin_unlock(&pkey->qp_list_lock);
293 
294 	pp->state = IB_PORT_PKEY_LISTED;
295 
296 	return ret;
297 }
298 
299 /* The caller of this function must hold the QP security
300  * mutex.
301  */
302 static void port_pkey_list_remove(struct ib_port_pkey *pp)
303 {
304 	struct pkey_index_qp_list *pkey;
305 
306 	if (pp->state != IB_PORT_PKEY_LISTED)
307 		return;
308 
309 	pkey = get_pkey_idx_qp_list(pp);
310 
311 	spin_lock(&pkey->qp_list_lock);
312 	list_del(&pp->qp_list);
313 	spin_unlock(&pkey->qp_list_lock);
314 
315 	/* The setting may still be valid, i.e. after
316 	 * a destroy has failed for example.
317 	 */
318 	pp->state = IB_PORT_PKEY_VALID;
319 }
320 
321 static void destroy_qp_security(struct ib_qp_security *sec)
322 {
323 	security_ib_free_security(sec->security);
324 	kfree(sec->ports_pkeys);
325 	kfree(sec);
326 }
327 
328 /* The caller of this function must hold the QP security
329  * mutex.
330  */
331 static struct ib_ports_pkeys *get_new_pps(const struct ib_qp *qp,
332 					  const struct ib_qp_attr *qp_attr,
333 					  int qp_attr_mask)
334 {
335 	struct ib_ports_pkeys *new_pps;
336 	struct ib_ports_pkeys *qp_pps = qp->qp_sec->ports_pkeys;
337 
338 	new_pps = kzalloc(sizeof(*new_pps), GFP_KERNEL);
339 	if (!new_pps)
340 		return NULL;
341 
342 	if (qp_attr_mask & IB_QP_PORT)
343 		new_pps->main.port_num = qp_attr->port_num;
344 	else if (qp_pps)
345 		new_pps->main.port_num = qp_pps->main.port_num;
346 
347 	if (qp_attr_mask & IB_QP_PKEY_INDEX)
348 		new_pps->main.pkey_index = qp_attr->pkey_index;
349 	else if (qp_pps)
350 		new_pps->main.pkey_index = qp_pps->main.pkey_index;
351 
352 	if (((qp_attr_mask & IB_QP_PKEY_INDEX) &&
353 	     (qp_attr_mask & IB_QP_PORT)) ||
354 	    (qp_pps && qp_pps->main.state != IB_PORT_PKEY_NOT_VALID))
355 		new_pps->main.state = IB_PORT_PKEY_VALID;
356 
357 	if (qp_attr_mask & IB_QP_ALT_PATH) {
358 		new_pps->alt.port_num = qp_attr->alt_port_num;
359 		new_pps->alt.pkey_index = qp_attr->alt_pkey_index;
360 		new_pps->alt.state = IB_PORT_PKEY_VALID;
361 	} else if (qp_pps) {
362 		new_pps->alt.port_num = qp_pps->alt.port_num;
363 		new_pps->alt.pkey_index = qp_pps->alt.pkey_index;
364 		if (qp_pps->alt.state != IB_PORT_PKEY_NOT_VALID)
365 			new_pps->alt.state = IB_PORT_PKEY_VALID;
366 	}
367 
368 	new_pps->main.sec = qp->qp_sec;
369 	new_pps->alt.sec = qp->qp_sec;
370 	return new_pps;
371 }
372 
373 int ib_open_shared_qp_security(struct ib_qp *qp, struct ib_device *dev)
374 {
375 	struct ib_qp *real_qp = qp->real_qp;
376 	int ret;
377 
378 	ret = ib_create_qp_security(qp, dev);
379 
380 	if (ret)
381 		return ret;
382 
383 	if (!qp->qp_sec)
384 		return 0;
385 
386 	mutex_lock(&real_qp->qp_sec->mutex);
387 	ret = check_qp_port_pkey_settings(real_qp->qp_sec->ports_pkeys,
388 					  qp->qp_sec);
389 
390 	if (ret)
391 		goto ret;
392 
393 	if (qp != real_qp)
394 		list_add(&qp->qp_sec->shared_qp_list,
395 			 &real_qp->qp_sec->shared_qp_list);
396 ret:
397 	mutex_unlock(&real_qp->qp_sec->mutex);
398 	if (ret)
399 		destroy_qp_security(qp->qp_sec);
400 
401 	return ret;
402 }
403 
404 void ib_close_shared_qp_security(struct ib_qp_security *sec)
405 {
406 	struct ib_qp *real_qp = sec->qp->real_qp;
407 
408 	mutex_lock(&real_qp->qp_sec->mutex);
409 	list_del(&sec->shared_qp_list);
410 	mutex_unlock(&real_qp->qp_sec->mutex);
411 
412 	destroy_qp_security(sec);
413 }
414 
415 int ib_create_qp_security(struct ib_qp *qp, struct ib_device *dev)
416 {
417 	unsigned int i;
418 	bool is_ib = false;
419 	int ret;
420 
421 	rdma_for_each_port (dev, i) {
422 		is_ib = rdma_protocol_ib(dev, i);
423 		if (is_ib)
424 			break;
425 	}
426 
427 	/* If this isn't an IB device don't create the security context */
428 	if (!is_ib)
429 		return 0;
430 
431 	qp->qp_sec = kzalloc(sizeof(*qp->qp_sec), GFP_KERNEL);
432 	if (!qp->qp_sec)
433 		return -ENOMEM;
434 
435 	qp->qp_sec->qp = qp;
436 	qp->qp_sec->dev = dev;
437 	mutex_init(&qp->qp_sec->mutex);
438 	INIT_LIST_HEAD(&qp->qp_sec->shared_qp_list);
439 	atomic_set(&qp->qp_sec->error_list_count, 0);
440 	init_completion(&qp->qp_sec->error_complete);
441 	ret = security_ib_alloc_security(&qp->qp_sec->security);
442 	if (ret) {
443 		kfree(qp->qp_sec);
444 		qp->qp_sec = NULL;
445 	}
446 
447 	return ret;
448 }
449 EXPORT_SYMBOL(ib_create_qp_security);
450 
451 void ib_destroy_qp_security_begin(struct ib_qp_security *sec)
452 {
453 	/* Return if not IB */
454 	if (!sec)
455 		return;
456 
457 	mutex_lock(&sec->mutex);
458 
459 	/* Remove the QP from the lists so it won't get added to
460 	 * a to_error_list during the destroy process.
461 	 */
462 	if (sec->ports_pkeys) {
463 		port_pkey_list_remove(&sec->ports_pkeys->main);
464 		port_pkey_list_remove(&sec->ports_pkeys->alt);
465 	}
466 
467 	/* If the QP is already in one or more of those lists
468 	 * the destroying flag will ensure the to error flow
469 	 * doesn't operate on an undefined QP.
470 	 */
471 	sec->destroying = true;
472 
473 	/* Record the error list count to know how many completions
474 	 * to wait for.
475 	 */
476 	sec->error_comps_pending = atomic_read(&sec->error_list_count);
477 
478 	mutex_unlock(&sec->mutex);
479 }
480 
481 void ib_destroy_qp_security_abort(struct ib_qp_security *sec)
482 {
483 	int ret;
484 	int i;
485 
486 	/* Return if not IB */
487 	if (!sec)
488 		return;
489 
490 	/* If a concurrent cache update is in progress this
491 	 * QP security could be marked for an error state
492 	 * transition.  Wait for this to complete.
493 	 */
494 	for (i = 0; i < sec->error_comps_pending; i++)
495 		wait_for_completion(&sec->error_complete);
496 
497 	mutex_lock(&sec->mutex);
498 	sec->destroying = false;
499 
500 	/* Restore the position in the lists and verify
501 	 * access is still allowed in case a cache update
502 	 * occurred while attempting to destroy.
503 	 *
504 	 * Because these setting were listed already
505 	 * and removed during ib_destroy_qp_security_begin
506 	 * we know the pkey_index_qp_list for the PKey
507 	 * already exists so port_pkey_list_insert won't fail.
508 	 */
509 	if (sec->ports_pkeys) {
510 		port_pkey_list_insert(&sec->ports_pkeys->main);
511 		port_pkey_list_insert(&sec->ports_pkeys->alt);
512 	}
513 
514 	ret = check_qp_port_pkey_settings(sec->ports_pkeys, sec);
515 	if (ret)
516 		qp_to_error(sec);
517 
518 	mutex_unlock(&sec->mutex);
519 }
520 
521 void ib_destroy_qp_security_end(struct ib_qp_security *sec)
522 {
523 	int i;
524 
525 	/* Return if not IB */
526 	if (!sec)
527 		return;
528 
529 	/* If a concurrent cache update is occurring we must
530 	 * wait until this QP security structure is processed
531 	 * in the QP to error flow before destroying it because
532 	 * the to_error_list is in use.
533 	 */
534 	for (i = 0; i < sec->error_comps_pending; i++)
535 		wait_for_completion(&sec->error_complete);
536 
537 	destroy_qp_security(sec);
538 }
539 
540 void ib_security_cache_change(struct ib_device *device,
541 			      u8 port_num,
542 			      u64 subnet_prefix)
543 {
544 	struct pkey_index_qp_list *pkey;
545 
546 	list_for_each_entry (pkey, &device->port_data[port_num].pkey_list,
547 			     pkey_index_list) {
548 		check_pkey_qps(pkey,
549 			       device,
550 			       port_num,
551 			       subnet_prefix);
552 	}
553 }
554 
555 void ib_security_release_port_pkey_list(struct ib_device *device)
556 {
557 	struct pkey_index_qp_list *pkey, *tmp_pkey;
558 	unsigned int i;
559 
560 	rdma_for_each_port (device, i) {
561 		list_for_each_entry_safe(pkey,
562 					 tmp_pkey,
563 					 &device->port_data[i].pkey_list,
564 					 pkey_index_list) {
565 			list_del(&pkey->pkey_index_list);
566 			kfree(pkey);
567 		}
568 	}
569 }
570 
571 int ib_security_modify_qp(struct ib_qp *qp,
572 			  struct ib_qp_attr *qp_attr,
573 			  int qp_attr_mask,
574 			  struct ib_udata *udata)
575 {
576 	int ret = 0;
577 	struct ib_ports_pkeys *tmp_pps;
578 	struct ib_ports_pkeys *new_pps = NULL;
579 	struct ib_qp *real_qp = qp->real_qp;
580 	bool special_qp = (real_qp->qp_type == IB_QPT_SMI ||
581 			   real_qp->qp_type == IB_QPT_GSI ||
582 			   real_qp->qp_type >= IB_QPT_RESERVED1);
583 	bool pps_change = ((qp_attr_mask & (IB_QP_PKEY_INDEX | IB_QP_PORT)) ||
584 			   (qp_attr_mask & IB_QP_ALT_PATH));
585 
586 	WARN_ONCE((qp_attr_mask & IB_QP_PORT &&
587 		   rdma_protocol_ib(real_qp->device, qp_attr->port_num) &&
588 		   !real_qp->qp_sec),
589 		   "%s: QP security is not initialized for IB QP: %d\n",
590 		   __func__, real_qp->qp_num);
591 
592 	/* The port/pkey settings are maintained only for the real QP. Open
593 	 * handles on the real QP will be in the shared_qp_list. When
594 	 * enforcing security on the real QP all the shared QPs will be
595 	 * checked as well.
596 	 */
597 
598 	if (pps_change && !special_qp && real_qp->qp_sec) {
599 		mutex_lock(&real_qp->qp_sec->mutex);
600 		new_pps = get_new_pps(real_qp,
601 				      qp_attr,
602 				      qp_attr_mask);
603 		if (!new_pps) {
604 			mutex_unlock(&real_qp->qp_sec->mutex);
605 			return -ENOMEM;
606 		}
607 		/* Add this QP to the lists for the new port
608 		 * and pkey settings before checking for permission
609 		 * in case there is a concurrent cache update
610 		 * occurring.  Walking the list for a cache change
611 		 * doesn't acquire the security mutex unless it's
612 		 * sending the QP to error.
613 		 */
614 		ret = port_pkey_list_insert(&new_pps->main);
615 
616 		if (!ret)
617 			ret = port_pkey_list_insert(&new_pps->alt);
618 
619 		if (!ret)
620 			ret = check_qp_port_pkey_settings(new_pps,
621 							  real_qp->qp_sec);
622 	}
623 
624 	if (!ret)
625 		ret = real_qp->device->ops.modify_qp(real_qp,
626 						     qp_attr,
627 						     qp_attr_mask,
628 						     udata);
629 
630 	if (new_pps) {
631 		/* Clean up the lists and free the appropriate
632 		 * ports_pkeys structure.
633 		 */
634 		if (ret) {
635 			tmp_pps = new_pps;
636 		} else {
637 			tmp_pps = real_qp->qp_sec->ports_pkeys;
638 			real_qp->qp_sec->ports_pkeys = new_pps;
639 		}
640 
641 		if (tmp_pps) {
642 			port_pkey_list_remove(&tmp_pps->main);
643 			port_pkey_list_remove(&tmp_pps->alt);
644 		}
645 		kfree(tmp_pps);
646 		mutex_unlock(&real_qp->qp_sec->mutex);
647 	}
648 	return ret;
649 }
650 
651 static int ib_security_pkey_access(struct ib_device *dev,
652 				   u8 port_num,
653 				   u16 pkey_index,
654 				   void *sec)
655 {
656 	u64 subnet_prefix;
657 	u16 pkey;
658 	int ret;
659 
660 	if (!rdma_protocol_ib(dev, port_num))
661 		return 0;
662 
663 	ret = ib_get_cached_pkey(dev, port_num, pkey_index, &pkey);
664 	if (ret)
665 		return ret;
666 
667 	ret = ib_get_cached_subnet_prefix(dev, port_num, &subnet_prefix);
668 
669 	if (ret)
670 		return ret;
671 
672 	return security_ib_pkey_access(sec, subnet_prefix, pkey);
673 }
674 
675 void ib_mad_agent_security_change(void)
676 {
677 	struct ib_mad_agent *ag;
678 
679 	spin_lock(&mad_agent_list_lock);
680 	list_for_each_entry(ag,
681 			    &mad_agent_list,
682 			    mad_agent_sec_list)
683 		WRITE_ONCE(ag->smp_allowed,
684 			   !security_ib_endport_manage_subnet(ag->security,
685 				dev_name(&ag->device->dev), ag->port_num));
686 	spin_unlock(&mad_agent_list_lock);
687 }
688 
689 int ib_mad_agent_security_setup(struct ib_mad_agent *agent,
690 				enum ib_qp_type qp_type)
691 {
692 	int ret;
693 
694 	if (!rdma_protocol_ib(agent->device, agent->port_num))
695 		return 0;
696 
697 	INIT_LIST_HEAD(&agent->mad_agent_sec_list);
698 
699 	ret = security_ib_alloc_security(&agent->security);
700 	if (ret)
701 		return ret;
702 
703 	if (qp_type != IB_QPT_SMI)
704 		return 0;
705 
706 	spin_lock(&mad_agent_list_lock);
707 	ret = security_ib_endport_manage_subnet(agent->security,
708 						dev_name(&agent->device->dev),
709 						agent->port_num);
710 	if (ret)
711 		goto free_security;
712 
713 	WRITE_ONCE(agent->smp_allowed, true);
714 	list_add(&agent->mad_agent_sec_list, &mad_agent_list);
715 	spin_unlock(&mad_agent_list_lock);
716 	return 0;
717 
718 free_security:
719 	spin_unlock(&mad_agent_list_lock);
720 	security_ib_free_security(agent->security);
721 	return ret;
722 }
723 
724 void ib_mad_agent_security_cleanup(struct ib_mad_agent *agent)
725 {
726 	if (!rdma_protocol_ib(agent->device, agent->port_num))
727 		return;
728 
729 	if (agent->qp->qp_type == IB_QPT_SMI) {
730 		spin_lock(&mad_agent_list_lock);
731 		list_del(&agent->mad_agent_sec_list);
732 		spin_unlock(&mad_agent_list_lock);
733 	}
734 
735 	security_ib_free_security(agent->security);
736 }
737 
738 int ib_mad_enforce_security(struct ib_mad_agent_private *map, u16 pkey_index)
739 {
740 	if (!rdma_protocol_ib(map->agent.device, map->agent.port_num))
741 		return 0;
742 
743 	if (map->agent.qp->qp_type == IB_QPT_SMI) {
744 		if (!READ_ONCE(map->agent.smp_allowed))
745 			return -EACCES;
746 		return 0;
747 	}
748 
749 	return ib_security_pkey_access(map->agent.device,
750 				       map->agent.port_num,
751 				       pkey_index,
752 				       map->agent.security);
753 }
754