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