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