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 #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 struct pkey_index_qp_list *get_pkey_idx_qp_list(struct ib_port_pkey *pp)
  43 {
  44         struct pkey_index_qp_list *pkey = NULL;
  45         struct pkey_index_qp_list *tmp_pkey;
  46         struct ib_device *dev = pp->sec->dev;
  47
  48         spin_lock(&dev->port_pkey_list[pp->port_num].list_lock);
  49         list_for_each_entry(tmp_pkey,
  50                             &dev->port_pkey_list[pp->port_num].pkey_list,
  51                             pkey_index_list) {
  52                 if (tmp_pkey->pkey_index == pp->pkey_index) {
  53                         pkey = tmp_pkey;
  54                         break;
  55                 }
  56         }
  57         spin_unlock(&dev->port_pkey_list[pp->port_num].list_lock);
  58         return pkey;
  59 }
  60
  61 static int get_pkey_and_subnet_prefix(struct ib_port_pkey *pp,
  62                                       u16 *pkey,
  63                                       u64 *subnet_prefix)
  64 {
  65         struct ib_device *dev = pp->sec->dev;
  66         int ret;
  67
  68         ret = ib_get_cached_pkey(dev, pp->port_num, pp->pkey_index, pkey);
  69         if (ret)
  70                 return ret;
  71
  72         ret = ib_get_cached_subnet_prefix(dev, pp->port_num, subnet_prefix);
  73
  74         return ret;
  75 }
  76
  77 static int enforce_qp_pkey_security(u16 pkey,
  78                                     u64 subnet_prefix,
  79                                     struct ib_qp_security *qp_sec)
  80 {
  81         struct ib_qp_security *shared_qp_sec;
  82         int ret;
  83
  84         ret = security_ib_pkey_access(qp_sec->security, subnet_prefix, pkey);
  85         if (ret)
  86                 return ret;
  87
  88         list_for_each_entry(shared_qp_sec,
  89                             &qp_sec->shared_qp_list,
  90                             shared_qp_list) {
  91                 ret = security_ib_pkey_access(shared_qp_sec->security,
  92                                               subnet_prefix,
  93                                               pkey);
  94                 if (ret)
  95                         return ret;
  96         }
  97         return 0;
  98 }
  99
 100 /* The caller of this function must hold the QP security
 101  * mutex of the QP of the security structure in *pps.
 102  *
 103  * It takes separate ports_pkeys and security structure
 104  * because in some cases the pps will be for a new settings
 105  * or the pps will be for the real QP and security structure
 106  * will be for a shared QP.
 107  */
 108 static int check_qp_port_pkey_settings(struct ib_ports_pkeys *pps,
 109                                        struct ib_qp_security *sec)
 110 {
 111         u64 subnet_prefix;
 112         u16 pkey;
 113         int ret = 0;
 114
 115         if (!pps)
 116                 return 0;
 117
 118         if (pps->main.state != IB_PORT_PKEY_NOT_VALID) {
 119                 ret = get_pkey_and_subnet_prefix(&pps->main,
 120                                                  &pkey,
 121                                                  &subnet_prefix);
 122                 if (ret)
 123                         return ret;
 124
 125                 ret = enforce_qp_pkey_security(pkey,
 126                                                subnet_prefix,
 127                                                sec);
 128                 if (ret)
 129                         return ret;
 130         }
 131
 132         if (pps->alt.state != IB_PORT_PKEY_NOT_VALID) {
 133                 ret = get_pkey_and_subnet_prefix(&pps->alt,
 134                                                  &pkey,
 135                                                  &subnet_prefix);
 136                 if (ret)
 137                         return ret;
 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_PORT)
 340                 new_pps->main.port_num = qp_attr->port_num;
 341         else if (qp_pps)
 342                 new_pps->main.port_num = qp_pps->main.port_num;
 343
 344         if (qp_attr_mask & IB_QP_PKEY_INDEX)
 345                 new_pps->main.pkey_index = qp_attr->pkey_index;
 346         else if (qp_pps)
 347                 new_pps->main.pkey_index = qp_pps->main.pkey_index;
 348
 349         if (((qp_attr_mask & IB_QP_PKEY_INDEX) &&
 350              (qp_attr_mask & IB_QP_PORT)) ||
 351             (qp_pps && qp_pps->main.state != IB_PORT_PKEY_NOT_VALID))
 352                 new_pps->main.state = IB_PORT_PKEY_VALID;
 353
 354         if (qp_attr_mask & IB_QP_ALT_PATH) {
 355                 new_pps->alt.port_num = qp_attr->alt_port_num;
 356                 new_pps->alt.pkey_index = qp_attr->alt_pkey_index;
 357                 new_pps->alt.state = IB_PORT_PKEY_VALID;
 358         } else if (qp_pps) {
 359                 new_pps->alt.port_num = qp_pps->alt.port_num;
 360                 new_pps->alt.pkey_index = qp_pps->alt.pkey_index;
 361                 if (qp_pps->alt.state != IB_PORT_PKEY_NOT_VALID)
 362                         new_pps->alt.state = IB_PORT_PKEY_VALID;
 363         }
 364
 365         new_pps->main.sec = qp->qp_sec;
 366         new_pps->alt.sec = qp->qp_sec;
 367         return new_pps;
 368 }
 369
 370 int ib_open_shared_qp_security(struct ib_qp *qp, struct ib_device *dev)
 371 {
 372         struct ib_qp *real_qp = qp->real_qp;
 373         int ret;
 374
 375         ret = ib_create_qp_security(qp, dev);
 376
 377         if (ret)
 378                 return ret;
 379
 380         if (!qp->qp_sec)
 381                 return 0;
 382
 383         mutex_lock(&real_qp->qp_sec->mutex);
 384         ret = check_qp_port_pkey_settings(real_qp->qp_sec->ports_pkeys,
 385                                           qp->qp_sec);
 386
 387         if (ret)
 388                 goto ret;
 389
 390         if (qp != real_qp)
 391                 list_add(&qp->qp_sec->shared_qp_list,
 392                          &real_qp->qp_sec->shared_qp_list);
 393 ret:
 394         mutex_unlock(&real_qp->qp_sec->mutex);
 395         if (ret)
 396                 destroy_qp_security(qp->qp_sec);
 397
 398         return ret;
 399 }
 400
 401 void ib_close_shared_qp_security(struct ib_qp_security *sec)
 402 {
 403         struct ib_qp *real_qp = sec->qp->real_qp;
 404
 405         mutex_lock(&real_qp->qp_sec->mutex);
 406         list_del(&sec->shared_qp_list);
 407         mutex_unlock(&real_qp->qp_sec->mutex);
 408
 409         destroy_qp_security(sec);
 410 }
 411
 412 int ib_create_qp_security(struct ib_qp *qp, struct ib_device *dev)
 413 {
 414         u8 i = rdma_start_port(dev);
 415         bool is_ib = false;
 416         int ret;
 417
 418         while (i <= rdma_end_port(dev) && !is_ib)
 419                 is_ib = rdma_protocol_ib(dev, i++);
 420
 421         /* If this isn't an IB device don't create the security context */
 422         if (!is_ib)
 423                 return 0;
 424
 425         qp->qp_sec = kzalloc(sizeof(*qp->qp_sec), GFP_KERNEL);
 426         if (!qp->qp_sec)
 427                 return -ENOMEM;
 428
 429         qp->qp_sec->qp = qp;
 430         qp->qp_sec->dev = dev;
 431         mutex_init(&qp->qp_sec->mutex);
 432         INIT_LIST_HEAD(&qp->qp_sec->shared_qp_list);
 433         atomic_set(&qp->qp_sec->error_list_count, 0);
 434         init_completion(&qp->qp_sec->error_complete);
 435         ret = security_ib_alloc_security(&qp->qp_sec->security);
 436         if (ret) {
 437                 kfree(qp->qp_sec);
 438                 qp->qp_sec = NULL;
 439         }
 440
 441         return ret;
 442 }
 443 EXPORT_SYMBOL(ib_create_qp_security);
 444
 445 void ib_destroy_qp_security_begin(struct ib_qp_security *sec)
 446 {
 447         /* Return if not IB */
 448         if (!sec)
 449                 return;
 450
 451         mutex_lock(&sec->mutex);
 452
 453         /* Remove the QP from the lists so it won't get added to
 454          * a to_error_list during the destroy process.
 455          */
 456         if (sec->ports_pkeys) {
 457                 port_pkey_list_remove(&sec->ports_pkeys->main);
 458                 port_pkey_list_remove(&sec->ports_pkeys->alt);
 459         }
 460
 461         /* If the QP is already in one or more of those lists
 462          * the destroying flag will ensure the to error flow
 463          * doesn't operate on an undefined QP.
 464          */
 465         sec->destroying = true;
 466
 467         /* Record the error list count to know how many completions
 468          * to wait for.
 469          */
 470         sec->error_comps_pending = atomic_read(&sec->error_list_count);
 471
 472         mutex_unlock(&sec->mutex);
 473 }
 474
 475 void ib_destroy_qp_security_abort(struct ib_qp_security *sec)
 476 {
 477         int ret;
 478         int i;
 479
 480         /* Return if not IB */
 481         if (!sec)
 482                 return;
 483
 484         /* If a concurrent cache update is in progress this
 485          * QP security could be marked for an error state
 486          * transition.  Wait for this to complete.
 487          */
 488         for (i = 0; i < sec->error_comps_pending; i++)
 489                 wait_for_completion(&sec->error_complete);
 490
 491         mutex_lock(&sec->mutex);
 492         sec->destroying = false;
 493
 494         /* Restore the position in the lists and verify
 495          * access is still allowed in case a cache update
 496          * occurred while attempting to destroy.
 497          *
 498          * Because these setting were listed already
 499          * and removed during ib_destroy_qp_security_begin
 500          * we know the pkey_index_qp_list for the PKey
 501          * already exists so port_pkey_list_insert won't fail.
 502          */
 503         if (sec->ports_pkeys) {
 504                 port_pkey_list_insert(&sec->ports_pkeys->main);
 505                 port_pkey_list_insert(&sec->ports_pkeys->alt);
 506         }
 507
 508         ret = check_qp_port_pkey_settings(sec->ports_pkeys, sec);
 509         if (ret)
 510                 qp_to_error(sec);
 511
 512         mutex_unlock(&sec->mutex);
 513 }
 514
 515 void ib_destroy_qp_security_end(struct ib_qp_security *sec)
 516 {
 517         int i;
 518
 519         /* Return if not IB */
 520         if (!sec)
 521                 return;
 522
 523         /* If a concurrent cache update is occurring we must
 524          * wait until this QP security structure is processed
 525          * in the QP to error flow before destroying it because
 526          * the to_error_list is in use.
 527          */
 528         for (i = 0; i < sec->error_comps_pending; i++)
 529                 wait_for_completion(&sec->error_complete);
 530
 531         destroy_qp_security(sec);
 532 }
 533
 534 void ib_security_cache_change(struct ib_device *device,
 535                               u8 port_num,
 536                               u64 subnet_prefix)
 537 {
 538         struct pkey_index_qp_list *pkey;
 539
 540         list_for_each_entry(pkey,
 541                             &device->port_pkey_list[port_num].pkey_list,
 542                             pkey_index_list) {
 543                 check_pkey_qps(pkey,
 544                                device,
 545                                port_num,
 546                                subnet_prefix);
 547         }
 548 }
 549
 550 void ib_security_destroy_port_pkey_list(struct ib_device *device)
 551 {
 552         struct pkey_index_qp_list *pkey, *tmp_pkey;
 553         int i;
 554
 555         for (i = rdma_start_port(device); i <= rdma_end_port(device); i++) {
 556                 spin_lock(&device->port_pkey_list[i].list_lock);
 557                 list_for_each_entry_safe(pkey,
 558                                          tmp_pkey,
 559                                          &device->port_pkey_list[i].pkey_list,
 560                                          pkey_index_list) {
 561                         list_del(&pkey->pkey_index_list);
 562                         kfree(pkey);
 563                 }
 564                 spin_unlock(&device->port_pkey_list[i].list_lock);
 565         }
 566 }
 567
 568 int ib_security_modify_qp(struct ib_qp *qp,
 569                           struct ib_qp_attr *qp_attr,
 570                           int qp_attr_mask,
 571                           struct ib_udata *udata)
 572 {
 573         int ret = 0;
 574         struct ib_ports_pkeys *tmp_pps;
 575         struct ib_ports_pkeys *new_pps = NULL;
 576         struct ib_qp *real_qp = qp->real_qp;
 577         bool special_qp = (real_qp->qp_type == IB_QPT_SMI ||
 578                            real_qp->qp_type == IB_QPT_GSI ||
 579                            real_qp->qp_type >= IB_QPT_RESERVED1);
 580         bool pps_change = ((qp_attr_mask & (IB_QP_PKEY_INDEX | IB_QP_PORT)) ||
 581                            (qp_attr_mask & IB_QP_ALT_PATH));
 582
 583         WARN_ONCE((qp_attr_mask & IB_QP_PORT &&
 584                    rdma_protocol_ib(real_qp->device, qp_attr->port_num) &&
 585                    !real_qp->qp_sec),
 586                    "%s: QP security is not initialized for IB QP: %d\n",
 587                    __func__, real_qp->qp_num);
 588
 589         /* The port/pkey settings are maintained only for the real QP. Open
 590          * handles on the real QP will be in the shared_qp_list. When
 591          * enforcing security on the real QP all the shared QPs will be
 592          * checked as well.
 593          */
 594
 595         if (pps_change && !special_qp && real_qp->qp_sec) {
 596                 mutex_lock(&real_qp->qp_sec->mutex);
 597                 new_pps = get_new_pps(real_qp,
 598                                       qp_attr,
 599                                       qp_attr_mask);
 600                 if (!new_pps) {
 601                         mutex_unlock(&real_qp->qp_sec->mutex);
 602                         return -ENOMEM;
 603                 }
 604                 /* Add this QP to the lists for the new port
 605                  * and pkey settings before checking for permission
 606                  * in case there is a concurrent cache update
 607                  * occurring.  Walking the list for a cache change
 608                  * doesn't acquire the security mutex unless it's
 609                  * sending the QP to error.
 610                  */
 611                 ret = port_pkey_list_insert(&new_pps->main);
 612
 613                 if (!ret)
 614                         ret = port_pkey_list_insert(&new_pps->alt);
 615
 616                 if (!ret)
 617                         ret = check_qp_port_pkey_settings(new_pps,
 618                                                           real_qp->qp_sec);
 619         }
 620
 621         if (!ret)
 622                 ret = real_qp->device->modify_qp(real_qp,
 623                                                  qp_attr,
 624                                                  qp_attr_mask,
 625                                                  udata);
 626
 627         if (new_pps) {
 628                 /* Clean up the lists and free the appropriate
 629                  * ports_pkeys structure.
 630                  */
 631                 if (ret) {
 632                         tmp_pps = new_pps;
 633                 } else {
 634                         tmp_pps = real_qp->qp_sec->ports_pkeys;
 635                         real_qp->qp_sec->ports_pkeys = new_pps;
 636                 }
 637
 638                 if (tmp_pps) {
 639                         port_pkey_list_remove(&tmp_pps->main);
 640                         port_pkey_list_remove(&tmp_pps->alt);
 641                 }
 642                 kfree(tmp_pps);
 643                 mutex_unlock(&real_qp->qp_sec->mutex);
 644         }
 645         return ret;
 646 }
 647
 648 static int ib_security_pkey_access(struct ib_device *dev,
 649                                    u8 port_num,
 650                                    u16 pkey_index,
 651                                    void *sec)
 652 {
 653         u64 subnet_prefix;
 654         u16 pkey;
 655         int ret;
 656
 657         if (!rdma_protocol_ib(dev, port_num))
 658                 return 0;
 659
 660         ret = ib_get_cached_pkey(dev, port_num, pkey_index, &pkey);
 661         if (ret)
 662                 return ret;
 663
 664         ret = ib_get_cached_subnet_prefix(dev, port_num, &subnet_prefix);
 665
 666         if (ret)
 667                 return ret;
 668
 669         return security_ib_pkey_access(sec, subnet_prefix, pkey);
 670 }
 671
 672 static int ib_mad_agent_security_change(struct notifier_block *nb,
 673                                         unsigned long event,
 674                                         void *data)
 675 {
 676         struct ib_mad_agent *ag = container_of(nb, struct ib_mad_agent, lsm_nb);
 677
 678         if (event != LSM_POLICY_CHANGE)
 679                 return NOTIFY_DONE;
 680
 681         ag->smp_allowed = !security_ib_endport_manage_subnet(ag->security,
 682                                                              ag->device->name,
 683                                                              ag->port_num);
 684
 685         return NOTIFY_OK;
 686 }
 687
 688 int ib_mad_agent_security_setup(struct ib_mad_agent *agent,
 689                                 enum ib_qp_type qp_type)
 690 {
 691         int ret;
 692
 693         if (!rdma_protocol_ib(agent->device, agent->port_num))
 694                 return 0;
 695
 696         ret = security_ib_alloc_security(&agent->security);
 697         if (ret)
 698                 return ret;
 699
 700         if (qp_type != IB_QPT_SMI)
 701                 return 0;
 702
 703         ret = security_ib_endport_manage_subnet(agent->security,
 704                                                 agent->device->name,
 705                                                 agent->port_num);
 706         if (ret)
 707                 goto free_security;
 708
 709         agent->lsm_nb.notifier_call = ib_mad_agent_security_change;
 710         ret = register_lsm_notifier(&agent->lsm_nb);
 711         if (ret)
 712                 goto free_security;
 713
 714         agent->smp_allowed = true;
 715         agent->lsm_nb_reg = true;
 716         return 0;
 717
 718 free_security:
 719         security_ib_free_security(agent->security);
 720         return ret;
 721 }
 722
 723 void ib_mad_agent_security_cleanup(struct ib_mad_agent *agent)
 724 {
 725         if (!rdma_protocol_ib(agent->device, agent->port_num))
 726                 return;
 727
 728         if (agent->lsm_nb_reg)
 729                 unregister_lsm_notifier(&agent->lsm_nb);
 730
 731         security_ib_free_security(agent->security);
 732 }
 733
 734 int ib_mad_enforce_security(struct ib_mad_agent_private *map, u16 pkey_index)
 735 {
 736         if (!rdma_protocol_ib(map->agent.device, map->agent.port_num))
 737                 return 0;
 738
 739         if (map->agent.qp->qp_type == IB_QPT_SMI) {
 740                 if (!map->agent.smp_allowed)
 741                         return -EACCES;
 742                 return 0;
 743         }
 744
 745         return ib_security_pkey_access(map->agent.device,
 746                                        map->agent.port_num,
 747                                        pkey_index,
 748                                        map->agent.security);
 749 }