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         list_for_each_entry(shared_qp_sec,
  91                             &qp_sec->shared_qp_list,
  92                             shared_qp_list) {
  93                 ret = security_ib_pkey_access(shared_qp_sec->security,
  94                                               subnet_prefix,
  95                                               pkey);
  96                 if (ret)
  97                         return ret;
  98         }
  99         return 0;
 100 }
 101
 102 /* The caller of this function must hold the QP security
 103  * mutex of the QP of the security structure in *pps.
 104  *
 105  * It takes separate ports_pkeys and security structure
 106  * because in some cases the pps will be for a new settings
 107  * or the pps will be for the real QP and security structure
 108  * will be for a shared QP.
 109  */
 110 static int check_qp_port_pkey_settings(struct ib_ports_pkeys *pps,
 111                                        struct ib_qp_security *sec)
 112 {
 113         u64 subnet_prefix;
 114         u16 pkey;
 115         int ret = 0;
 116
 117         if (!pps)
 118                 return 0;
 119
 120         if (pps->main.state != IB_PORT_PKEY_NOT_VALID) {
 121                 ret = get_pkey_and_subnet_prefix(&pps->main,
 122                                                  &pkey,
 123                                                  &subnet_prefix);
 124                 if (ret)
 125                         return ret;
 126
 127                 ret = enforce_qp_pkey_security(pkey,
 128                                                subnet_prefix,
 129                                                sec);
 130                 if (ret)
 131                         return ret;
 132         }
 133
 134         if (pps->alt.state != IB_PORT_PKEY_NOT_VALID) {
 135                 ret = get_pkey_and_subnet_prefix(&pps->alt,
 136                                                  &pkey,
 137                                                  &subnet_prefix);
 138                 if (ret)
 139                         return ret;
 140
 141                 ret = enforce_qp_pkey_security(pkey,
 142                                                subnet_prefix,
 143                                                sec);
 144         }
 145
 146         return ret;
 147 }
 148
 149 /* The caller of this function must hold the QP security
 150  * mutex.
 151  */
 152 static void qp_to_error(struct ib_qp_security *sec)
 153 {
 154         struct ib_qp_security *shared_qp_sec;
 155         struct ib_qp_attr attr = {
 156                 .qp_state = IB_QPS_ERR
 157         };
 158         struct ib_event event = {
 159                 .event = IB_EVENT_QP_FATAL
 160         };
 161
 162         /* If the QP is in the process of being destroyed
 163          * the qp pointer in the security structure is
 164          * undefined.  It cannot be modified now.
 165          */
 166         if (sec->destroying)
 167                 return;
 168
 169         ib_modify_qp(sec->qp,
 170                      &attr,
 171                      IB_QP_STATE);
 172
 173         if (sec->qp->event_handler && sec->qp->qp_context) {
 174                 event.element.qp = sec->qp;
 175                 sec->qp->event_handler(&event,
 176                                        sec->qp->qp_context);
 177         }
 178
 179         list_for_each_entry(shared_qp_sec,
 180                             &sec->shared_qp_list,
 181                             shared_qp_list) {
 182                 struct ib_qp *qp = shared_qp_sec->qp;
 183
 184                 if (qp->event_handler && qp->qp_context) {
 185                         event.element.qp = qp;
 186                         event.device = qp->device;
 187                         qp->event_handler(&event,
 188                                           qp->qp_context);
 189                 }
 190         }
 191 }
 192
 193 static inline void check_pkey_qps(struct pkey_index_qp_list *pkey,
 194                                   struct ib_device *device,
 195                                   u8 port_num,
 196                                   u64 subnet_prefix)
 197 {
 198         struct ib_port_pkey *pp, *tmp_pp;
 199         bool comp;
 200         LIST_HEAD(to_error_list);
 201         u16 pkey_val;
 202
 203         if (!ib_get_cached_pkey(device,
 204                                 port_num,
 205                                 pkey->pkey_index,
 206                                 &pkey_val)) {
 207                 spin_lock(&pkey->qp_list_lock);
 208                 list_for_each_entry(pp, &pkey->qp_list, qp_list) {
 209                         if (atomic_read(&pp->sec->error_list_count))
 210                                 continue;
 211
 212                         if (enforce_qp_pkey_security(pkey_val,
 213                                                      subnet_prefix,
 214                                                      pp->sec)) {
 215                                 atomic_inc(&pp->sec->error_list_count);
 216                                 list_add(&pp->to_error_list,
 217                                          &to_error_list);
 218                         }
 219                 }
 220                 spin_unlock(&pkey->qp_list_lock);
 221         }
 222
 223         list_for_each_entry_safe(pp,
 224                                  tmp_pp,
 225                                  &to_error_list,
 226                                  to_error_list) {
 227                 mutex_lock(&pp->sec->mutex);
 228                 qp_to_error(pp->sec);
 229                 list_del(&pp->to_error_list);
 230                 atomic_dec(&pp->sec->error_list_count);
 231                 comp = pp->sec->destroying;
 232                 mutex_unlock(&pp->sec->mutex);
 233
 234                 if (comp)
 235                         complete(&pp->sec->error_complete);
 236         }
 237 }
 238
 239 /* The caller of this function must hold the QP security
 240  * mutex.
 241  */
 242 static int port_pkey_list_insert(struct ib_port_pkey *pp)
 243 {
 244         struct pkey_index_qp_list *tmp_pkey;
 245         struct pkey_index_qp_list *pkey;
 246         struct ib_device *dev;
 247         u8 port_num = pp->port_num;
 248         int ret = 0;
 249
 250         if (pp->state != IB_PORT_PKEY_VALID)
 251                 return 0;
 252
 253         dev = pp->sec->dev;
 254
 255         pkey = get_pkey_idx_qp_list(pp);
 256
 257         if (!pkey) {
 258                 bool found = false;
 259
 260                 pkey = kzalloc(sizeof(*pkey), GFP_KERNEL);
 261                 if (!pkey)
 262                         return -ENOMEM;
 263
 264                 spin_lock(&dev->port_pkey_list[port_num].list_lock);
 265                 /* Check for the PKey again.  A racing process may
 266                  * have created it.
 267                  */
 268                 list_for_each_entry(tmp_pkey,
 269                                     &dev->port_pkey_list[port_num].pkey_list,
 270                                     pkey_index_list) {
 271                         if (tmp_pkey->pkey_index == pp->pkey_index) {
 272                                 kfree(pkey);
 273                                 pkey = tmp_pkey;
 274                                 found = true;
 275                                 break;
 276                         }
 277                 }
 278
 279                 if (!found) {
 280                         pkey->pkey_index = pp->pkey_index;
 281                         spin_lock_init(&pkey->qp_list_lock);
 282                         INIT_LIST_HEAD(&pkey->qp_list);
 283                         list_add(&pkey->pkey_index_list,
 284                                  &dev->port_pkey_list[port_num].pkey_list);
 285                 }
 286                 spin_unlock(&dev->port_pkey_list[port_num].list_lock);
 287         }
 288
 289         spin_lock(&pkey->qp_list_lock);
 290         list_add(&pp->qp_list, &pkey->qp_list);
 291         spin_unlock(&pkey->qp_list_lock);
 292
 293         pp->state = IB_PORT_PKEY_LISTED;
 294
 295         return ret;
 296 }
 297
 298 /* The caller of this function must hold the QP security
 299  * mutex.
 300  */
 301 static void port_pkey_list_remove(struct ib_port_pkey *pp)
 302 {
 303         struct pkey_index_qp_list *pkey;
 304
 305         if (pp->state != IB_PORT_PKEY_LISTED)
 306                 return;
 307
 308         pkey = get_pkey_idx_qp_list(pp);
 309
 310         spin_lock(&pkey->qp_list_lock);
 311         list_del(&pp->qp_list);
 312         spin_unlock(&pkey->qp_list_lock);
 313
 314         /* The setting may still be valid, i.e. after
 315          * a destroy has failed for example.
 316          */
 317         pp->state = IB_PORT_PKEY_VALID;
 318 }
 319
 320 static void destroy_qp_security(struct ib_qp_security *sec)
 321 {
 322         security_ib_free_security(sec->security);
 323         kfree(sec->ports_pkeys);
 324         kfree(sec);
 325 }
 326
 327 /* The caller of this function must hold the QP security
 328  * mutex.
 329  */
 330 static struct ib_ports_pkeys *get_new_pps(const struct ib_qp *qp,
 331                                           const struct ib_qp_attr *qp_attr,
 332                                           int qp_attr_mask)
 333 {
 334         struct ib_ports_pkeys *new_pps;
 335         struct ib_ports_pkeys *qp_pps = qp->qp_sec->ports_pkeys;
 336
 337         new_pps = kzalloc(sizeof(*new_pps), GFP_KERNEL);
 338         if (!new_pps)
 339                 return NULL;
 340
 341         if (qp_attr_mask & IB_QP_PORT)
 342                 new_pps->main.port_num = qp_attr->port_num;
 343         else if (qp_pps)
 344                 new_pps->main.port_num = qp_pps->main.port_num;
 345
 346         if (qp_attr_mask & IB_QP_PKEY_INDEX)
 347                 new_pps->main.pkey_index = qp_attr->pkey_index;
 348         else if (qp_pps)
 349                 new_pps->main.pkey_index = qp_pps->main.pkey_index;
 350
 351         if (((qp_attr_mask & IB_QP_PKEY_INDEX) &&
 352              (qp_attr_mask & IB_QP_PORT)) ||
 353             (qp_pps && qp_pps->main.state != IB_PORT_PKEY_NOT_VALID))
 354                 new_pps->main.state = IB_PORT_PKEY_VALID;
 355
 356         if (qp_attr_mask & IB_QP_ALT_PATH) {
 357                 new_pps->alt.port_num = qp_attr->alt_port_num;
 358                 new_pps->alt.pkey_index = qp_attr->alt_pkey_index;
 359                 new_pps->alt.state = IB_PORT_PKEY_VALID;
 360         } else if (qp_pps) {
 361                 new_pps->alt.port_num = qp_pps->alt.port_num;
 362                 new_pps->alt.pkey_index = qp_pps->alt.pkey_index;
 363                 if (qp_pps->alt.state != IB_PORT_PKEY_NOT_VALID)
 364                         new_pps->alt.state = IB_PORT_PKEY_VALID;
 365         }
 366
 367         new_pps->main.sec = qp->qp_sec;
 368         new_pps->alt.sec = qp->qp_sec;
 369         return new_pps;
 370 }
 371
 372 int ib_open_shared_qp_security(struct ib_qp *qp, struct ib_device *dev)
 373 {
 374         struct ib_qp *real_qp = qp->real_qp;
 375         int ret;
 376
 377         ret = ib_create_qp_security(qp, dev);
 378
 379         if (ret)
 380                 return ret;
 381
 382         if (!qp->qp_sec)
 383                 return 0;
 384
 385         mutex_lock(&real_qp->qp_sec->mutex);
 386         ret = check_qp_port_pkey_settings(real_qp->qp_sec->ports_pkeys,
 387                                           qp->qp_sec);
 388
 389         if (ret)
 390                 goto ret;
 391
 392         if (qp != real_qp)
 393                 list_add(&qp->qp_sec->shared_qp_list,
 394                          &real_qp->qp_sec->shared_qp_list);
 395 ret:
 396         mutex_unlock(&real_qp->qp_sec->mutex);
 397         if (ret)
 398                 destroy_qp_security(qp->qp_sec);
 399
 400         return ret;
 401 }
 402
 403 void ib_close_shared_qp_security(struct ib_qp_security *sec)
 404 {
 405         struct ib_qp *real_qp = sec->qp->real_qp;
 406
 407         mutex_lock(&real_qp->qp_sec->mutex);
 408         list_del(&sec->shared_qp_list);
 409         mutex_unlock(&real_qp->qp_sec->mutex);
 410
 411         destroy_qp_security(sec);
 412 }
 413
 414 int ib_create_qp_security(struct ib_qp *qp, struct ib_device *dev)
 415 {
 416         u8 i = rdma_start_port(dev);
 417         bool is_ib = false;
 418         int ret;
 419
 420         while (i <= rdma_end_port(dev) && !is_ib)
 421                 is_ib = rdma_protocol_ib(dev, i++);
 422
 423         /* If this isn't an IB device don't create the security context */
 424         if (!is_ib)
 425                 return 0;
 426
 427         qp->qp_sec = kzalloc(sizeof(*qp->qp_sec), GFP_KERNEL);
 428         if (!qp->qp_sec)
 429                 return -ENOMEM;
 430
 431         qp->qp_sec->qp = qp;
 432         qp->qp_sec->dev = dev;
 433         mutex_init(&qp->qp_sec->mutex);
 434         INIT_LIST_HEAD(&qp->qp_sec->shared_qp_list);
 435         atomic_set(&qp->qp_sec->error_list_count, 0);
 436         init_completion(&qp->qp_sec->error_complete);
 437         ret = security_ib_alloc_security(&qp->qp_sec->security);
 438         if (ret) {
 439                 kfree(qp->qp_sec);
 440                 qp->qp_sec = NULL;
 441         }
 442
 443         return ret;
 444 }
 445 EXPORT_SYMBOL(ib_create_qp_security);
 446
 447 void ib_destroy_qp_security_begin(struct ib_qp_security *sec)
 448 {
 449         /* Return if not IB */
 450         if (!sec)
 451                 return;
 452
 453         mutex_lock(&sec->mutex);
 454
 455         /* Remove the QP from the lists so it won't get added to
 456          * a to_error_list during the destroy process.
 457          */
 458         if (sec->ports_pkeys) {
 459                 port_pkey_list_remove(&sec->ports_pkeys->main);
 460                 port_pkey_list_remove(&sec->ports_pkeys->alt);
 461         }
 462
 463         /* If the QP is already in one or more of those lists
 464          * the destroying flag will ensure the to error flow
 465          * doesn't operate on an undefined QP.
 466          */
 467         sec->destroying = true;
 468
 469         /* Record the error list count to know how many completions
 470          * to wait for.
 471          */
 472         sec->error_comps_pending = atomic_read(&sec->error_list_count);
 473
 474         mutex_unlock(&sec->mutex);
 475 }
 476
 477 void ib_destroy_qp_security_abort(struct ib_qp_security *sec)
 478 {
 479         int ret;
 480         int i;
 481
 482         /* Return if not IB */
 483         if (!sec)
 484                 return;
 485
 486         /* If a concurrent cache update is in progress this
 487          * QP security could be marked for an error state
 488          * transition.  Wait for this to complete.
 489          */
 490         for (i = 0; i < sec->error_comps_pending; i++)
 491                 wait_for_completion(&sec->error_complete);
 492
 493         mutex_lock(&sec->mutex);
 494         sec->destroying = false;
 495
 496         /* Restore the position in the lists and verify
 497          * access is still allowed in case a cache update
 498          * occurred while attempting to destroy.
 499          *
 500          * Because these setting were listed already
 501          * and removed during ib_destroy_qp_security_begin
 502          * we know the pkey_index_qp_list for the PKey
 503          * already exists so port_pkey_list_insert won't fail.
 504          */
 505         if (sec->ports_pkeys) {
 506                 port_pkey_list_insert(&sec->ports_pkeys->main);
 507                 port_pkey_list_insert(&sec->ports_pkeys->alt);
 508         }
 509
 510         ret = check_qp_port_pkey_settings(sec->ports_pkeys, sec);
 511         if (ret)
 512                 qp_to_error(sec);
 513
 514         mutex_unlock(&sec->mutex);
 515 }
 516
 517 void ib_destroy_qp_security_end(struct ib_qp_security *sec)
 518 {
 519         int i;
 520
 521         /* Return if not IB */
 522         if (!sec)
 523                 return;
 524
 525         /* If a concurrent cache update is occurring we must
 526          * wait until this QP security structure is processed
 527          * in the QP to error flow before destroying it because
 528          * the to_error_list is in use.
 529          */
 530         for (i = 0; i < sec->error_comps_pending; i++)
 531                 wait_for_completion(&sec->error_complete);
 532
 533         destroy_qp_security(sec);
 534 }
 535
 536 void ib_security_cache_change(struct ib_device *device,
 537                               u8 port_num,
 538                               u64 subnet_prefix)
 539 {
 540         struct pkey_index_qp_list *pkey;
 541
 542         list_for_each_entry(pkey,
 543                             &device->port_pkey_list[port_num].pkey_list,
 544                             pkey_index_list) {
 545                 check_pkey_qps(pkey,
 546                                device,
 547                                port_num,
 548                                subnet_prefix);
 549         }
 550 }
 551
 552 void ib_security_destroy_port_pkey_list(struct ib_device *device)
 553 {
 554         struct pkey_index_qp_list *pkey, *tmp_pkey;
 555         int i;
 556
 557         for (i = rdma_start_port(device); i <= rdma_end_port(device); i++) {
 558                 spin_lock(&device->port_pkey_list[i].list_lock);
 559                 list_for_each_entry_safe(pkey,
 560                                          tmp_pkey,
 561                                          &device->port_pkey_list[i].pkey_list,
 562                                          pkey_index_list) {
 563                         list_del(&pkey->pkey_index_list);
 564                         kfree(pkey);
 565                 }
 566                 spin_unlock(&device->port_pkey_list[i].list_lock);
 567         }
 568 }
 569
 570 int ib_security_modify_qp(struct ib_qp *qp,
 571                           struct ib_qp_attr *qp_attr,
 572                           int qp_attr_mask,
 573                           struct ib_udata *udata)
 574 {
 575         int ret = 0;
 576         struct ib_ports_pkeys *tmp_pps;
 577         struct ib_ports_pkeys *new_pps = NULL;
 578         struct ib_qp *real_qp = qp->real_qp;
 579         bool special_qp = (real_qp->qp_type == IB_QPT_SMI ||
 580                            real_qp->qp_type == IB_QPT_GSI ||
 581                            real_qp->qp_type >= IB_QPT_RESERVED1);
 582         bool pps_change = ((qp_attr_mask & (IB_QP_PKEY_INDEX | IB_QP_PORT)) ||
 583                            (qp_attr_mask & IB_QP_ALT_PATH));
 584
 585         WARN_ONCE((qp_attr_mask & IB_QP_PORT &&
 586                    rdma_protocol_ib(real_qp->device, qp_attr->port_num) &&
 587                    !real_qp->qp_sec),
 588                    "%s: QP security is not initialized for IB QP: %d\n",
 589                    __func__, real_qp->qp_num);
 590
 591         /* The port/pkey settings are maintained only for the real QP. Open
 592          * handles on the real QP will be in the shared_qp_list. When
 593          * enforcing security on the real QP all the shared QPs will be
 594          * checked as well.
 595          */
 596
 597         if (pps_change && !special_qp && real_qp->qp_sec) {
 598                 mutex_lock(&real_qp->qp_sec->mutex);
 599                 new_pps = get_new_pps(real_qp,
 600                                       qp_attr,
 601                                       qp_attr_mask);
 602                 if (!new_pps) {
 603                         mutex_unlock(&real_qp->qp_sec->mutex);
 604                         return -ENOMEM;
 605                 }
 606                 /* Add this QP to the lists for the new port
 607                  * and pkey settings before checking for permission
 608                  * in case there is a concurrent cache update
 609                  * occurring.  Walking the list for a cache change
 610                  * doesn't acquire the security mutex unless it's
 611                  * sending the QP to error.
 612                  */
 613                 ret = port_pkey_list_insert(&new_pps->main);
 614
 615                 if (!ret)
 616                         ret = port_pkey_list_insert(&new_pps->alt);
 617
 618                 if (!ret)
 619                         ret = check_qp_port_pkey_settings(new_pps,
 620                                                           real_qp->qp_sec);
 621         }
 622
 623         if (!ret)
 624                 ret = real_qp->device->modify_qp(real_qp,
 625                                                  qp_attr,
 626                                                  qp_attr_mask,
 627                                                  udata);
 628
 629         if (new_pps) {
 630                 /* Clean up the lists and free the appropriate
 631                  * ports_pkeys structure.
 632                  */
 633                 if (ret) {
 634                         tmp_pps = new_pps;
 635                 } else {
 636                         tmp_pps = real_qp->qp_sec->ports_pkeys;
 637                         real_qp->qp_sec->ports_pkeys = new_pps;
 638                 }
 639
 640                 if (tmp_pps) {
 641                         port_pkey_list_remove(&tmp_pps->main);
 642                         port_pkey_list_remove(&tmp_pps->alt);
 643                 }
 644                 kfree(tmp_pps);
 645                 mutex_unlock(&real_qp->qp_sec->mutex);
 646         }
 647         return ret;
 648 }
 649 EXPORT_SYMBOL(ib_security_modify_qp);
 650
 651 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 EXPORT_SYMBOL(ib_security_pkey_access);
 675
 676 static int ib_mad_agent_security_change(struct notifier_block *nb,
 677                                         unsigned long event,
 678                                         void *data)
 679 {
 680         struct ib_mad_agent *ag = container_of(nb, struct ib_mad_agent, lsm_nb);
 681
 682         if (event != LSM_POLICY_CHANGE)
 683                 return NOTIFY_DONE;
 684
 685         ag->smp_allowed = !security_ib_endport_manage_subnet(ag->security,
 686                                                              ag->device->name,
 687                                                              ag->port_num);
 688
 689         return NOTIFY_OK;
 690 }
 691
 692 int ib_mad_agent_security_setup(struct ib_mad_agent *agent,
 693                                 enum ib_qp_type qp_type)
 694 {
 695         int ret;
 696
 697         if (!rdma_protocol_ib(agent->device, agent->port_num))
 698                 return 0;
 699
 700         ret = security_ib_alloc_security(&agent->security);
 701         if (ret)
 702                 return ret;
 703
 704         if (qp_type != IB_QPT_SMI)
 705                 return 0;
 706
 707         ret = security_ib_endport_manage_subnet(agent->security,
 708                                                 agent->device->name,
 709                                                 agent->port_num);
 710         if (ret)
 711                 goto free_security;
 712
 713         agent->lsm_nb.notifier_call = ib_mad_agent_security_change;
 714         ret = register_lsm_notifier(&agent->lsm_nb);
 715         if (ret)
 716                 goto free_security;
 717
 718         agent->smp_allowed = true;
 719         agent->lsm_nb_reg = true;
 720         return 0;
 721
 722 free_security:
 723         security_ib_free_security(agent->security);
 724         return ret;
 725 }
 726
 727 void ib_mad_agent_security_cleanup(struct ib_mad_agent *agent)
 728 {
 729         if (!rdma_protocol_ib(agent->device, agent->port_num))
 730                 return;
 731
 732         if (agent->lsm_nb_reg)
 733                 unregister_lsm_notifier(&agent->lsm_nb);
 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 (!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
 755 #endif /* CONFIG_SECURITY_INFINIBAND */