drivers/infiniband/core/security.c

   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 #ifdef CONFIG_SECURITY_INFINIBAND
  34
  35 #include <linux/security.h>
  36 #include <linux/completion.h>
  37 #include <linux/list.h>
  38
  39 #include <rdma/ib_verbs.h>
  40 #include <rdma/ib_cache.h>
  41 #include "core_priv.h"
  42 #include "mad_priv.h"
  43
  44 static struct pkey_index_qp_list *get_pkey_idx_qp_list(struct ib_port_pkey *pp)
  45 {
  46         struct pkey_index_qp_list *pkey = NULL;
  47         struct pkey_index_qp_list *tmp_pkey;
  48         struct ib_device *dev = pp->sec->dev;
  49
  50         spin_lock(&dev->port_pkey_list[pp->port_num].list_lock);
  51         list_for_each_entry(tmp_pkey,
  52                             &dev->port_pkey_list[pp->port_num].pkey_list,
  53                             pkey_index_list) {
  54                 if (tmp_pkey->pkey_index == pp->pkey_index) {
  55                         pkey = tmp_pkey;
  56                         break;
  57                 }
  58         }
  59         spin_unlock(&dev->port_pkey_list[pp->port_num].list_lock);
  60         return pkey;
  61 }
  62
  63 static int get_pkey_and_subnet_prefix(struct ib_port_pkey *pp,
  64                                       u16 *pkey,
  65                                       u64 *subnet_prefix)
  66 {
  67         struct ib_device *dev = pp->sec->dev;
  68         int ret;
  69
  70         ret = ib_get_cached_pkey(dev, pp->port_num, pp->pkey_index, pkey);
  71         if (ret)
  72                 return ret;
  73
  74         ret = ib_get_cached_subnet_prefix(dev, pp->port_num, subnet_prefix);
  75
  76         return ret;
  77 }
  78
  79 static int enforce_qp_pkey_security(u16 pkey,
  80                                     u64 subnet_prefix,
  81                                     struct ib_qp_security *qp_sec)
  82 {
  83         struct ib_qp_security *shared_qp_sec;
  84         int ret;
  85
  86         ret = security_ib_pkey_access(qp_sec->security, subnet_prefix, pkey);
  87         if (ret)
  88                 return ret;
  89
  90         if (qp_sec->qp == qp_sec->qp->real_qp) {
  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         }
 101         return 0;
 102 }
 103
 104 /* The caller of this function must hold the QP security
 105  * mutex of the QP of the security structure in *pps.
 106  *
 107  * It takes separate ports_pkeys and security structure
 108  * because in some cases the pps will be for a new settings
 109  * or the pps will be for the real QP and security structure
 110  * will be for a shared QP.
 111  */
 112 static int check_qp_port_pkey_settings(struct ib_ports_pkeys *pps,
 113                                        struct ib_qp_security *sec)
 114 {
 115         u64 subnet_prefix;
 116         u16 pkey;
 117         int ret = 0;
 118
 119         if (!pps)
 120                 return 0;
 121
 122         if (pps->main.state != IB_PORT_PKEY_NOT_VALID) {
 123                 ret = get_pkey_and_subnet_prefix(&pps->main,
 124                                                  &pkey,
 125                                                  &subnet_prefix);
 126                 if (ret)
 127                         return ret;
 128
 129                 ret = enforce_qp_pkey_security(pkey,
 130                                                subnet_prefix,
 131                                                sec);
 132                 if (ret)
 133                         return ret;
 134         }
 135
 136         if (pps->alt.state != IB_PORT_PKEY_NOT_VALID) {
 137                 ret = get_pkey_and_subnet_prefix(&pps->alt,
 138                                                  &pkey,
 139                                                  &subnet_prefix);
 140                 if (ret)
 141                         return ret;
 142
 143                 ret = enforce_qp_pkey_security(pkey,
 144                                                subnet_prefix,
 145                                                sec);
 146         }
 147
 148         return ret;
 149 }
 150
 151 /* The caller of this function must hold the QP security
 152  * mutex.
 153  */
 154 static void qp_to_error(struct ib_qp_security *sec)
 155 {
 156         struct ib_qp_security *shared_qp_sec;
 157         struct ib_qp_attr attr = {
 158                 .qp_state = IB_QPS_ERR
 159         };
 160         struct ib_event event = {
 161                 .event = IB_EVENT_QP_FATAL
 162         };
 163
 164         /* If the QP is in the process of being destroyed
 165          * the qp pointer in the security structure is
 166          * undefined.  It cannot be modified now.
 167          */
 168         if (sec->destroying)
 169                 return;
 170
 171         ib_modify_qp(sec->qp,
 172                      &attr,
 173                      IB_QP_STATE);
 174
 175         if (sec->qp->event_handler && sec->qp->qp_context) {
 176                 event.element.qp = sec->qp;
 177                 sec->qp->event_handler(&event,
 178                                        sec->qp->qp_context);
 179         }
 180
 181         list_for_each_entry(shared_qp_sec,
 182                             &sec->shared_qp_list,
 183                             shared_qp_list) {
 184                 struct ib_qp *qp = shared_qp_sec->qp;
 185
 186                 if (qp->event_handler && qp->qp_context) {
 187                         event.element.qp = qp;
 188                         event.device = qp->device;
 189                         qp->event_handler(&event,
 190                                           qp->qp_context);
 191                 }
 192         }
 193 }
 194
 195 static inline void check_pkey_qps(struct pkey_index_qp_list *pkey,
 196                                   struct ib_device *device,
 197                                   u8 port_num,
 198                                   u64 subnet_prefix)
 199 {
 200         struct ib_port_pkey *pp, *tmp_pp;
 201         bool comp;
 202         LIST_HEAD(to_error_list);
 203         u16 pkey_val;
 204
 205         if (!ib_get_cached_pkey(device,
 206                                 port_num,
 207                                 pkey->pkey_index,
 208                                 &pkey_val)) {
 209                 spin_lock(&pkey->qp_list_lock);
 210                 list_for_each_entry(pp, &pkey->qp_list, qp_list) {
 211                         if (atomic_read(&pp->sec->error_list_count))
 212                                 continue;
 213
 214                         if (enforce_qp_pkey_security(pkey_val,
 215                                                      subnet_prefix,
 216                                                      pp->sec)) {
 217                                 atomic_inc(&pp->sec->error_list_count);
 218                                 list_add(&pp->to_error_list,
 219                                          &to_error_list);
 220                         }
 221                 }
 222                 spin_unlock(&pkey->qp_list_lock);
 223         }
 224
 225         list_for_each_entry_safe(pp,
 226                                  tmp_pp,
 227                                  &to_error_list,
 228                                  to_error_list) {
 229                 mutex_lock(&pp->sec->mutex);
 230                 qp_to_error(pp->sec);
 231                 list_del(&pp->to_error_list);
 232                 atomic_dec(&pp->sec->error_list_count);
 233                 comp = pp->sec->destroying;
 234                 mutex_unlock(&pp->sec->mutex);
 235
 236                 if (comp)
 237                         complete(&pp->sec->error_complete);
 238         }
 239 }
 240
 241 /* The caller of this function must hold the QP security
 242  * mutex.
 243  */
 244 static int port_pkey_list_insert(struct ib_port_pkey *pp)
 245 {
 246         struct pkey_index_qp_list *tmp_pkey;
 247         struct pkey_index_qp_list *pkey;
 248         struct ib_device *dev;
 249         u8 port_num = pp->port_num;
 250         int ret = 0;
 251
 252         if (pp->state != IB_PORT_PKEY_VALID)
 253                 return 0;
 254
 255         dev = pp->sec->dev;
 256
 257         pkey = get_pkey_idx_qp_list(pp);
 258
 259         if (!pkey) {
 260                 bool found = false;
 261
 262                 pkey = kzalloc(sizeof(*pkey), GFP_KERNEL);
 263                 if (!pkey)
 264                         return -ENOMEM;
 265
 266                 spin_lock(&dev->port_pkey_list[port_num].list_lock);
 267                 /* Check for the PKey again.  A racing process may
 268                  * have created it.
 269                  */
 270                 list_for_each_entry(tmp_pkey,
 271                                     &dev->port_pkey_list[port_num].pkey_list,
 272                                     pkey_index_list) {
 273                         if (tmp_pkey->pkey_index == pp->pkey_index) {
 274                                 kfree(pkey);
 275                                 pkey = tmp_pkey;
 276                                 found = true;
 277                                 break;
 278                         }
 279                 }
 280
 281                 if (!found) {
 282                         pkey->pkey_index = pp->pkey_index;
 283                         spin_lock_init(&pkey->qp_list_lock);
 284                         INIT_LIST_HEAD(&pkey->qp_list);
 285                         list_add(&pkey->pkey_index_list,
 286                                  &dev->port_pkey_list[port_num].pkey_list);
 287                 }
 288                 spin_unlock(&dev->port_pkey_list[port_num].list_lock);
 289         }
 290
 291         spin_lock(&pkey->qp_list_lock);
 292         list_add(&pp->qp_list, &pkey->qp_list);
 293         spin_unlock(&pkey->qp_list_lock);
 294
 295         pp->state = IB_PORT_PKEY_LISTED;
 296
 297         return ret;
 298 }
 299
 300 /* The caller of this function must hold the QP security
 301  * mutex.
 302  */
 303 static void port_pkey_list_remove(struct ib_port_pkey *pp)
 304 {
 305         struct pkey_index_qp_list *pkey;
 306
 307         if (pp->state != IB_PORT_PKEY_LISTED)
 308                 return;
 309
 310         pkey = get_pkey_idx_qp_list(pp);
 311
 312         spin_lock(&pkey->qp_list_lock);
 313         list_del(&pp->qp_list);
 314         spin_unlock(&pkey->qp_list_lock);
 315
 316         /* The setting may still be valid, i.e. after
 317          * a destroy has failed for example.
 318          */
 319         pp->state = IB_PORT_PKEY_VALID;
 320 }
 321
 322 static void destroy_qp_security(struct ib_qp_security *sec)
 323 {
 324         security_ib_free_security(sec->security);
 325         kfree(sec->ports_pkeys);
 326         kfree(sec);
 327 }
 328
 329 /* The caller of this function must hold the QP security
 330  * mutex.
 331  */
 332 static struct ib_ports_pkeys *get_new_pps(const struct ib_qp *qp,
 333                                           const struct ib_qp_attr *qp_attr,
 334                                           int qp_attr_mask)
 335 {
 336         struct ib_ports_pkeys *new_pps;
 337         struct ib_ports_pkeys *qp_pps = qp->qp_sec->ports_pkeys;
 338
 339         new_pps = kzalloc(sizeof(*new_pps), GFP_KERNEL);
 340         if (!new_pps)
 341                 return NULL;
 342
 343         if (qp_attr_mask & (IB_QP_PKEY_INDEX | IB_QP_PORT)) {
 344                 if (!qp_pps) {
 345                         new_pps->main.port_num = qp_attr->port_num;
 346                         new_pps->main.pkey_index = qp_attr->pkey_index;
 347                 } else {
 348                         new_pps->main.port_num = (qp_attr_mask & IB_QP_PORT) ?
 349                                                   qp_attr->port_num :
 350                                                   qp_pps->main.port_num;
 351
 352                         new_pps->main.pkey_index =
 353                                         (qp_attr_mask & IB_QP_PKEY_INDEX) ?
 354                                          qp_attr->pkey_index :
 355                                          qp_pps->main.pkey_index;
 356                 }
 357                 new_pps->main.state = IB_PORT_PKEY_VALID;
 358         } else if (qp_pps) {
 359                 new_pps->main.port_num = qp_pps->main.port_num;
 360                 new_pps->main.pkey_index = qp_pps->main.pkey_index;
 361                 if (qp_pps->main.state != IB_PORT_PKEY_NOT_VALID)
 362                         new_pps->main.state = IB_PORT_PKEY_VALID;
 363         }
 364
 365         if (qp_attr_mask & IB_QP_ALT_PATH) {
 366                 new_pps->alt.port_num = qp_attr->alt_port_num;
 367                 new_pps->alt.pkey_index = qp_attr->alt_pkey_index;
 368                 new_pps->alt.state = IB_PORT_PKEY_VALID;
 369         } else if (qp_pps) {
 370                 new_pps->alt.port_num = qp_pps->alt.port_num;
 371                 new_pps->alt.pkey_index = qp_pps->alt.pkey_index;
 372                 if (qp_pps->alt.state != IB_PORT_PKEY_NOT_VALID)
 373                         new_pps->alt.state = IB_PORT_PKEY_VALID;
 374         }
 375
 376         new_pps->main.sec = qp->qp_sec;
 377         new_pps->alt.sec = qp->qp_sec;
 378         return new_pps;
 379 }
 380
 381 int ib_open_shared_qp_security(struct ib_qp *qp, struct ib_device *dev)
 382 {
 383         struct ib_qp *real_qp = qp->real_qp;
 384         int ret;
 385
 386         ret = ib_create_qp_security(qp, dev);
 387
 388         if (ret)
 389                 return ret;
 390
 391         mutex_lock(&real_qp->qp_sec->mutex);
 392         ret = check_qp_port_pkey_settings(real_qp->qp_sec->ports_pkeys,
 393                                           qp->qp_sec);
 394
 395         if (ret)
 396                 goto ret;
 397
 398         if (qp != real_qp)
 399                 list_add(&qp->qp_sec->shared_qp_list,
 400                          &real_qp->qp_sec->shared_qp_list);
 401 ret:
 402         mutex_unlock(&real_qp->qp_sec->mutex);
 403         if (ret)
 404                 destroy_qp_security(qp->qp_sec);
 405
 406         return ret;
 407 }
 408
 409 void ib_close_shared_qp_security(struct ib_qp_security *sec)
 410 {
 411         struct ib_qp *real_qp = sec->qp->real_qp;
 412
 413         mutex_lock(&real_qp->qp_sec->mutex);
 414         list_del(&sec->shared_qp_list);
 415         mutex_unlock(&real_qp->qp_sec->mutex);
 416
 417         destroy_qp_security(sec);
 418 }
 419
 420 int ib_create_qp_security(struct ib_qp *qp, struct ib_device *dev)
 421 {
 422         int ret;
 423
 424         qp->qp_sec = kzalloc(sizeof(*qp->qp_sec), GFP_KERNEL);
 425         if (!qp->qp_sec)
 426                 return -ENOMEM;
 427
 428         qp->qp_sec->qp = qp;
 429         qp->qp_sec->dev = dev;
 430         mutex_init(&qp->qp_sec->mutex);
 431         INIT_LIST_HEAD(&qp->qp_sec->shared_qp_list);
 432         atomic_set(&qp->qp_sec->error_list_count, 0);
 433         init_completion(&qp->qp_sec->error_complete);
 434         ret = security_ib_alloc_security(&qp->qp_sec->security);
 435         if (ret)
 436                 kfree(qp->qp_sec);
 437
 438         return ret;
 439 }
 440 EXPORT_SYMBOL(ib_create_qp_security);
 441
 442 void ib_destroy_qp_security_begin(struct ib_qp_security *sec)
 443 {
 444         mutex_lock(&sec->mutex);
 445
 446         /* Remove the QP from the lists so it won't get added to
 447          * a to_error_list during the destroy process.
 448          */
 449         if (sec->ports_pkeys) {
 450                 port_pkey_list_remove(&sec->ports_pkeys->main);
 451                 port_pkey_list_remove(&sec->ports_pkeys->alt);
 452         }
 453
 454         /* If the QP is already in one or more of those lists
 455          * the destroying flag will ensure the to error flow
 456          * doesn't operate on an undefined QP.
 457          */
 458         sec->destroying = true;
 459
 460         /* Record the error list count to know how many completions
 461          * to wait for.
 462          */
 463         sec->error_comps_pending = atomic_read(&sec->error_list_count);
 464
 465         mutex_unlock(&sec->mutex);
 466 }
 467
 468 void ib_destroy_qp_security_abort(struct ib_qp_security *sec)
 469 {
 470         int ret;
 471         int i;
 472
 473         /* If a concurrent cache update is in progress this
 474          * QP security could be marked for an error state
 475          * transition.  Wait for this to complete.
 476          */
 477         for (i = 0; i < sec->error_comps_pending; i++)
 478                 wait_for_completion(&sec->error_complete);
 479
 480         mutex_lock(&sec->mutex);
 481         sec->destroying = false;
 482
 483         /* Restore the position in the lists and verify
 484          * access is still allowed in case a cache update
 485          * occurred while attempting to destroy.
 486          *
 487          * Because these setting were listed already
 488          * and removed during ib_destroy_qp_security_begin
 489          * we know the pkey_index_qp_list for the PKey
 490          * already exists so port_pkey_list_insert won't fail.
 491          */
 492         if (sec->ports_pkeys) {
 493                 port_pkey_list_insert(&sec->ports_pkeys->main);
 494                 port_pkey_list_insert(&sec->ports_pkeys->alt);
 495         }
 496
 497         ret = check_qp_port_pkey_settings(sec->ports_pkeys, sec);
 498         if (ret)
 499                 qp_to_error(sec);
 500
 501         mutex_unlock(&sec->mutex);
 502 }
 503
 504 void ib_destroy_qp_security_end(struct ib_qp_security *sec)
 505 {
 506         int i;
 507
 508         /* If a concurrent cache update is occurring we must
 509          * wait until this QP security structure is processed
 510          * in the QP to error flow before destroying it because
 511          * the to_error_list is in use.
 512          */
 513         for (i = 0; i < sec->error_comps_pending; i++)
 514                 wait_for_completion(&sec->error_complete);
 515
 516         destroy_qp_security(sec);
 517 }
 518
 519 void ib_security_cache_change(struct ib_device *device,
 520                               u8 port_num,
 521                               u64 subnet_prefix)
 522 {
 523         struct pkey_index_qp_list *pkey;
 524
 525         list_for_each_entry(pkey,
 526                             &device->port_pkey_list[port_num].pkey_list,
 527                             pkey_index_list) {
 528                 check_pkey_qps(pkey,
 529                                device,
 530                                port_num,
 531                                subnet_prefix);
 532         }
 533 }
 534
 535 void ib_security_destroy_port_pkey_list(struct ib_device *device)
 536 {
 537         struct pkey_index_qp_list *pkey, *tmp_pkey;
 538         int i;
 539
 540         for (i = rdma_start_port(device); i <= rdma_end_port(device); i++) {
 541                 spin_lock(&device->port_pkey_list[i].list_lock);
 542                 list_for_each_entry_safe(pkey,
 543                                          tmp_pkey,
 544                                          &device->port_pkey_list[i].pkey_list,
 545                                          pkey_index_list) {
 546                         list_del(&pkey->pkey_index_list);
 547                         kfree(pkey);
 548                 }
 549                 spin_unlock(&device->port_pkey_list[i].list_lock);
 550         }
 551 }
 552
 553 int ib_security_modify_qp(struct ib_qp *qp,
 554                           struct ib_qp_attr *qp_attr,
 555                           int qp_attr_mask,
 556                           struct ib_udata *udata)
 557 {
 558         int ret = 0;
 559         struct ib_ports_pkeys *tmp_pps;
 560         struct ib_ports_pkeys *new_pps;
 561         bool special_qp = (qp->qp_type == IB_QPT_SMI ||
 562                            qp->qp_type == IB_QPT_GSI ||
 563                            qp->qp_type >= IB_QPT_RESERVED1);
 564         bool pps_change = ((qp_attr_mask & (IB_QP_PKEY_INDEX | IB_QP_PORT)) ||
 565                            (qp_attr_mask & IB_QP_ALT_PATH));
 566
 567         if (pps_change && !special_qp) {
 568                 mutex_lock(&qp->qp_sec->mutex);
 569                 new_pps = get_new_pps(qp,
 570                                       qp_attr,
 571                                       qp_attr_mask);
 572
 573                 /* Add this QP to the lists for the new port
 574                  * and pkey settings before checking for permission
 575                  * in case there is a concurrent cache update
 576                  * occurring.  Walking the list for a cache change
 577                  * doesn't acquire the security mutex unless it's
 578                  * sending the QP to error.
 579                  */
 580                 ret = port_pkey_list_insert(&new_pps->main);
 581
 582                 if (!ret)
 583                         ret = port_pkey_list_insert(&new_pps->alt);
 584
 585                 if (!ret)
 586                         ret = check_qp_port_pkey_settings(new_pps,
 587                                                           qp->qp_sec);
 588         }
 589
 590         if (!ret)
 591                 ret = qp->device->modify_qp(qp->real_qp,
 592                                             qp_attr,
 593                                             qp_attr_mask,
 594                                             udata);
 595
 596         if (pps_change && !special_qp) {
 597                 /* Clean up the lists and free the appropriate
 598                  * ports_pkeys structure.
 599                  */
 600                 if (ret) {
 601                         tmp_pps = new_pps;
 602                 } else {
 603                         tmp_pps = qp->qp_sec->ports_pkeys;
 604                         qp->qp_sec->ports_pkeys = new_pps;
 605                 }
 606
 607                 if (tmp_pps) {
 608                         port_pkey_list_remove(&tmp_pps->main);
 609                         port_pkey_list_remove(&tmp_pps->alt);
 610                 }
 611                 kfree(tmp_pps);
 612                 mutex_unlock(&qp->qp_sec->mutex);
 613         }
 614         return ret;
 615 }
 616 EXPORT_SYMBOL(ib_security_modify_qp);
 617
 618 int ib_security_pkey_access(struct ib_device *dev,
 619                             u8 port_num,
 620                             u16 pkey_index,
 621                             void *sec)
 622 {
 623         u64 subnet_prefix;
 624         u16 pkey;
 625         int ret;
 626
 627         ret = ib_get_cached_pkey(dev, port_num, pkey_index, &pkey);
 628         if (ret)
 629                 return ret;
 630
 631         ret = ib_get_cached_subnet_prefix(dev, port_num, &subnet_prefix);
 632
 633         if (ret)
 634                 return ret;
 635
 636         return security_ib_pkey_access(sec, subnet_prefix, pkey);
 637 }
 638 EXPORT_SYMBOL(ib_security_pkey_access);
 639
 640 static int ib_mad_agent_security_change(struct notifier_block *nb,
 641                                         unsigned long event,
 642                                         void *data)
 643 {
 644         struct ib_mad_agent *ag = container_of(nb, struct ib_mad_agent, lsm_nb);
 645
 646         if (event != LSM_POLICY_CHANGE)
 647                 return NOTIFY_DONE;
 648
 649         ag->smp_allowed = !security_ib_endport_manage_subnet(ag->security,
 650                                                              ag->device->name,
 651                                                              ag->port_num);
 652
 653         return NOTIFY_OK;
 654 }
 655
 656 int ib_mad_agent_security_setup(struct ib_mad_agent *agent,
 657                                 enum ib_qp_type qp_type)
 658 {
 659         int ret;
 660
 661         ret = security_ib_alloc_security(&agent->security);
 662         if (ret)
 663                 return ret;
 664
 665         if (qp_type != IB_QPT_SMI)
 666                 return 0;
 667
 668         ret = security_ib_endport_manage_subnet(agent->security,
 669                                                 agent->device->name,
 670                                                 agent->port_num);
 671         if (ret)
 672                 return ret;
 673
 674         agent->lsm_nb.notifier_call = ib_mad_agent_security_change;
 675         ret = register_lsm_notifier(&agent->lsm_nb);
 676         if (ret)
 677                 return ret;
 678
 679         agent->smp_allowed = true;
 680         agent->lsm_nb_reg = true;
 681         return 0;
 682 }
 683
 684 void ib_mad_agent_security_cleanup(struct ib_mad_agent *agent)
 685 {
 686         security_ib_free_security(agent->security);
 687         if (agent->lsm_nb_reg)
 688                 unregister_lsm_notifier(&agent->lsm_nb);
 689 }
 690
 691 int ib_mad_enforce_security(struct ib_mad_agent_private *map, u16 pkey_index)
 692 {
 693         int ret;
 694
 695         if (map->agent.qp->qp_type == IB_QPT_SMI && !map->agent.smp_allowed)
 696                 return -EACCES;
 697
 698         ret = ib_security_pkey_access(map->agent.device,
 699                                       map->agent.port_num,
 700                                       pkey_index,
 701                                       map->agent.security);
 702
 703         if (ret)
 704                 return ret;
 705
 706         return 0;
 707 }
 708
 709 #endif /* CONFIG_SECURITY_INFINIBAND */