drivers/infiniband/core/uverbs_ioctl.c

   1 /*
   2  * Copyright (c) 2017, Mellanox Technologies inc.  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 <rdma/rdma_user_ioctl.h>
  34 #include <rdma/uverbs_ioctl.h>
  35 #include "rdma_core.h"
  36 #include "uverbs.h"
  37
  38 struct bundle_alloc_head {
  39         struct bundle_alloc_head *next;
  40         u8 data[];
  41 };
  42
  43 struct bundle_priv {
  44         /* Must be first */
  45         struct bundle_alloc_head alloc_head;
  46         struct bundle_alloc_head *allocated_mem;
  47         size_t internal_avail;
  48         size_t internal_used;
  49
  50         struct radix_tree_root *radix;
  51         const struct uverbs_api_ioctl_method *method_elm;
  52         void __rcu **radix_slots;
  53         unsigned long radix_slots_len;
  54         u32 method_key;
  55
  56         struct ib_uverbs_attr __user *user_attrs;
  57         struct ib_uverbs_attr *uattrs;
  58
  59         DECLARE_BITMAP(uobj_finalize, UVERBS_API_ATTR_BKEY_LEN);
  60         DECLARE_BITMAP(spec_finalize, UVERBS_API_ATTR_BKEY_LEN);
  61
  62         /*
  63          * Must be last. bundle ends in a flex array which overlaps
  64          * internal_buffer.
  65          */
  66         struct uverbs_attr_bundle bundle;
  67         u64 internal_buffer[32];
  68 };
  69
  70 /*
  71  * Each method has an absolute minimum amount of memory it needs to allocate,
  72  * precompute that amount and determine if the onstack memory can be used or
  73  * if allocation is need.
  74  */
  75 void uapi_compute_bundle_size(struct uverbs_api_ioctl_method *method_elm,
  76                               unsigned int num_attrs)
  77 {
  78         struct bundle_priv *pbundle;
  79         size_t bundle_size =
  80                 offsetof(struct bundle_priv, internal_buffer) +
  81                 sizeof(*pbundle->bundle.attrs) * method_elm->key_bitmap_len +
  82                 sizeof(*pbundle->uattrs) * num_attrs;
  83
  84         method_elm->use_stack = bundle_size <= sizeof(*pbundle);
  85         method_elm->bundle_size =
  86                 ALIGN(bundle_size + 256, sizeof(*pbundle->internal_buffer));
  87
  88         /* Do not want order-2 allocations for this. */
  89         WARN_ON_ONCE(method_elm->bundle_size > PAGE_SIZE);
  90 }
  91
  92 /**
  93  * uverbs_alloc() - Quickly allocate memory for use with a bundle
  94  * @bundle: The bundle
  95  * @size: Number of bytes to allocate
  96  * @flags: Allocator flags
  97  *
  98  * The bundle allocator is intended for allocations that are connected with
  99  * processing the system call related to the bundle. The allocated memory is
 100  * always freed once the system call completes, and cannot be freed any other
 101  * way.
 102  *
 103  * This tries to use a small pool of pre-allocated memory for performance.
 104  */
 105 __malloc void *_uverbs_alloc(struct uverbs_attr_bundle *bundle, size_t size,
 106                              gfp_t flags)
 107 {
 108         struct bundle_priv *pbundle =
 109                 container_of(bundle, struct bundle_priv, bundle);
 110         size_t new_used;
 111         void *res;
 112
 113         if (check_add_overflow(size, pbundle->internal_used, &new_used))
 114                 return ERR_PTR(-EOVERFLOW);
 115
 116         if (new_used > pbundle->internal_avail) {
 117                 struct bundle_alloc_head *buf;
 118
 119                 buf = kvmalloc(struct_size(buf, data, size), flags);
 120                 if (!buf)
 121                         return ERR_PTR(-ENOMEM);
 122                 buf->next = pbundle->allocated_mem;
 123                 pbundle->allocated_mem = buf;
 124                 return buf->data;
 125         }
 126
 127         res = (void *)pbundle->internal_buffer + pbundle->internal_used;
 128         pbundle->internal_used =
 129                 ALIGN(new_used, sizeof(*pbundle->internal_buffer));
 130         if (want_init_on_alloc(flags))
 131                 memset(res, 0, size);
 132         return res;
 133 }
 134 EXPORT_SYMBOL(_uverbs_alloc);
 135
 136 static bool uverbs_is_attr_cleared(const struct ib_uverbs_attr *uattr,
 137                                    u16 len)
 138 {
 139         if (uattr->len > sizeof(((struct ib_uverbs_attr *)0)->data))
 140                 return ib_is_buffer_cleared(u64_to_user_ptr(uattr->data) + len,
 141                                             uattr->len - len);
 142
 143         return !memchr_inv((const void *)&uattr->data + len,
 144                            0, uattr->len - len);
 145 }
 146
 147 static int uverbs_set_output(const struct uverbs_attr_bundle *bundle,
 148                              const struct uverbs_attr *attr)
 149 {
 150         struct bundle_priv *pbundle =
 151                 container_of(bundle, struct bundle_priv, bundle);
 152         u16 flags;
 153
 154         flags = pbundle->uattrs[attr->ptr_attr.uattr_idx].flags |
 155                 UVERBS_ATTR_F_VALID_OUTPUT;
 156         if (put_user(flags,
 157                      &pbundle->user_attrs[attr->ptr_attr.uattr_idx].flags))
 158                 return -EFAULT;
 159         return 0;
 160 }
 161
 162 static int uverbs_process_idrs_array(struct bundle_priv *pbundle,
 163                                      const struct uverbs_api_attr *attr_uapi,
 164                                      struct uverbs_objs_arr_attr *attr,
 165                                      struct ib_uverbs_attr *uattr,
 166                                      u32 attr_bkey)
 167 {
 168         const struct uverbs_attr_spec *spec = &attr_uapi->spec;
 169         size_t array_len;
 170         u32 *idr_vals;
 171         int ret = 0;
 172         size_t i;
 173
 174         if (uattr->attr_data.reserved)
 175                 return -EINVAL;
 176
 177         if (uattr->len % sizeof(u32))
 178                 return -EINVAL;
 179
 180         array_len = uattr->len / sizeof(u32);
 181         if (array_len < spec->u2.objs_arr.min_len ||
 182             array_len > spec->u2.objs_arr.max_len)
 183                 return -EINVAL;
 184
 185         attr->uobjects =
 186                 uverbs_alloc(&pbundle->bundle,
 187                              array_size(array_len, sizeof(*attr->uobjects)));
 188         if (IS_ERR(attr->uobjects))
 189                 return PTR_ERR(attr->uobjects);
 190
 191         /*
 192          * Since idr is 4B and *uobjects is >= 4B, we can use attr->uobjects
 193          * to store idrs array and avoid additional memory allocation. The
 194          * idrs array is offset to the end of the uobjects array so we will be
 195          * able to read idr and replace with a pointer.
 196          */
 197         idr_vals = (u32 *)(attr->uobjects + array_len) - array_len;
 198
 199         if (uattr->len > sizeof(uattr->data)) {
 200                 ret = copy_from_user(idr_vals, u64_to_user_ptr(uattr->data),
 201                                      uattr->len);
 202                 if (ret)
 203                         return -EFAULT;
 204         } else {
 205                 memcpy(idr_vals, &uattr->data, uattr->len);
 206         }
 207
 208         for (i = 0; i != array_len; i++) {
 209                 attr->uobjects[i] = uverbs_get_uobject_from_file(
 210                         spec->u2.objs_arr.obj_type, spec->u2.objs_arr.access,
 211                         idr_vals[i], &pbundle->bundle);
 212                 if (IS_ERR(attr->uobjects[i])) {
 213                         ret = PTR_ERR(attr->uobjects[i]);
 214                         break;
 215                 }
 216         }
 217
 218         attr->len = i;
 219         __set_bit(attr_bkey, pbundle->spec_finalize);
 220         return ret;
 221 }
 222
 223 static void uverbs_free_idrs_array(const struct uverbs_api_attr *attr_uapi,
 224                                    struct uverbs_objs_arr_attr *attr,
 225                                    bool commit,
 226                                    struct uverbs_attr_bundle *attrs)
 227 {
 228         const struct uverbs_attr_spec *spec = &attr_uapi->spec;
 229         size_t i;
 230
 231         for (i = 0; i != attr->len; i++)
 232                 uverbs_finalize_object(attr->uobjects[i],
 233                                        spec->u2.objs_arr.access, commit, attrs);
 234 }
 235
 236 static int uverbs_process_attr(struct bundle_priv *pbundle,
 237                                const struct uverbs_api_attr *attr_uapi,
 238                                struct ib_uverbs_attr *uattr, u32 attr_bkey)
 239 {
 240         const struct uverbs_attr_spec *spec = &attr_uapi->spec;
 241         struct uverbs_attr *e = &pbundle->bundle.attrs[attr_bkey];
 242         const struct uverbs_attr_spec *val_spec = spec;
 243         struct uverbs_obj_attr *o_attr;
 244
 245         switch (spec->type) {
 246         case UVERBS_ATTR_TYPE_ENUM_IN:
 247                 if (uattr->attr_data.enum_data.elem_id >= spec->u.enum_def.num_elems)
 248                         return -EOPNOTSUPP;
 249
 250                 if (uattr->attr_data.enum_data.reserved)
 251                         return -EINVAL;
 252
 253                 val_spec = &spec->u2.enum_def.ids[uattr->attr_data.enum_data.elem_id];
 254
 255                 /* Currently we only support PTR_IN based enums */
 256                 if (val_spec->type != UVERBS_ATTR_TYPE_PTR_IN)
 257                         return -EOPNOTSUPP;
 258
 259                 e->ptr_attr.enum_id = uattr->attr_data.enum_data.elem_id;
 260         /* fall through */
 261         case UVERBS_ATTR_TYPE_PTR_IN:
 262                 /* Ensure that any data provided by userspace beyond the known
 263                  * struct is zero. Userspace that knows how to use some future
 264                  * longer struct will fail here if used with an old kernel and
 265                  * non-zero content, making ABI compat/discovery simpler.
 266                  */
 267                 if (uattr->len > val_spec->u.ptr.len &&
 268                     val_spec->zero_trailing &&
 269                     !uverbs_is_attr_cleared(uattr, val_spec->u.ptr.len))
 270                         return -EOPNOTSUPP;
 271
 272         /* fall through */
 273         case UVERBS_ATTR_TYPE_PTR_OUT:
 274                 if (uattr->len < val_spec->u.ptr.min_len ||
 275                     (!val_spec->zero_trailing &&
 276                      uattr->len > val_spec->u.ptr.len))
 277                         return -EINVAL;
 278
 279                 if (spec->type != UVERBS_ATTR_TYPE_ENUM_IN &&
 280                     uattr->attr_data.reserved)
 281                         return -EINVAL;
 282
 283                 e->ptr_attr.uattr_idx = uattr - pbundle->uattrs;
 284                 e->ptr_attr.len = uattr->len;
 285
 286                 if (val_spec->alloc_and_copy && !uverbs_attr_ptr_is_inline(e)) {
 287                         void *p;
 288
 289                         p = uverbs_alloc(&pbundle->bundle, uattr->len);
 290                         if (IS_ERR(p))
 291                                 return PTR_ERR(p);
 292
 293                         e->ptr_attr.ptr = p;
 294
 295                         if (copy_from_user(p, u64_to_user_ptr(uattr->data),
 296                                            uattr->len))
 297                                 return -EFAULT;
 298                 } else {
 299                         e->ptr_attr.data = uattr->data;
 300                 }
 301                 break;
 302
 303         case UVERBS_ATTR_TYPE_IDR:
 304         case UVERBS_ATTR_TYPE_FD:
 305                 if (uattr->attr_data.reserved)
 306                         return -EINVAL;
 307
 308                 if (uattr->len != 0)
 309                         return -EINVAL;
 310
 311                 o_attr = &e->obj_attr;
 312                 o_attr->attr_elm = attr_uapi;
 313
 314                 /*
 315                  * The type of uattr->data is u64 for UVERBS_ATTR_TYPE_IDR and
 316                  * s64 for UVERBS_ATTR_TYPE_FD. We can cast the u64 to s64
 317                  * here without caring about truncation as we know that the
 318                  * IDR implementation today rejects negative IDs
 319                  */
 320                 o_attr->uobject = uverbs_get_uobject_from_file(
 321                         spec->u.obj.obj_type, spec->u.obj.access,
 322                         uattr->data_s64, &pbundle->bundle);
 323                 if (IS_ERR(o_attr->uobject))
 324                         return PTR_ERR(o_attr->uobject);
 325                 __set_bit(attr_bkey, pbundle->uobj_finalize);
 326
 327                 if (spec->u.obj.access == UVERBS_ACCESS_NEW) {
 328                         unsigned int uattr_idx = uattr - pbundle->uattrs;
 329                         s64 id = o_attr->uobject->id;
 330
 331                         /* Copy the allocated id to the user-space */
 332                         if (put_user(id, &pbundle->user_attrs[uattr_idx].data))
 333                                 return -EFAULT;
 334                 }
 335
 336                 break;
 337
 338         case UVERBS_ATTR_TYPE_IDRS_ARRAY:
 339                 return uverbs_process_idrs_array(pbundle, attr_uapi,
 340                                                  &e->objs_arr_attr, uattr,
 341                                                  attr_bkey);
 342         default:
 343                 return -EOPNOTSUPP;
 344         }
 345
 346         return 0;
 347 }
 348
 349 /*
 350  * We search the radix tree with the method prefix and now we want to fast
 351  * search the suffix bits to get a particular attribute pointer. It is not
 352  * totally clear to me if this breaks the radix tree encasulation or not, but
 353  * it uses the iter data to determine if the method iter points at the same
 354  * chunk that will store the attribute, if so it just derefs it directly. By
 355  * construction in most kernel configs the method and attrs will all fit in a
 356  * single radix chunk, so in most cases this will have no search. Other cases
 357  * this falls back to a full search.
 358  */
 359 static void __rcu **uapi_get_attr_for_method(struct bundle_priv *pbundle,
 360                                              u32 attr_key)
 361 {
 362         void __rcu **slot;
 363
 364         if (likely(attr_key < pbundle->radix_slots_len)) {
 365                 void *entry;
 366
 367                 slot = pbundle->radix_slots + attr_key;
 368                 entry = rcu_dereference_raw(*slot);
 369                 if (likely(!radix_tree_is_internal_node(entry) && entry))
 370                         return slot;
 371         }
 372
 373         return radix_tree_lookup_slot(pbundle->radix,
 374                                       pbundle->method_key | attr_key);
 375 }
 376
 377 static int uverbs_set_attr(struct bundle_priv *pbundle,
 378                            struct ib_uverbs_attr *uattr)
 379 {
 380         u32 attr_key = uapi_key_attr(uattr->attr_id);
 381         u32 attr_bkey = uapi_bkey_attr(attr_key);
 382         const struct uverbs_api_attr *attr;
 383         void __rcu **slot;
 384         int ret;
 385
 386         slot = uapi_get_attr_for_method(pbundle, attr_key);
 387         if (!slot) {
 388                 /*
 389                  * Kernel does not support the attribute but user-space says it
 390                  * is mandatory
 391                  */
 392                 if (uattr->flags & UVERBS_ATTR_F_MANDATORY)
 393                         return -EPROTONOSUPPORT;
 394                 return 0;
 395         }
 396         attr = rcu_dereference_protected(*slot, true);
 397
 398         /* Reject duplicate attributes from user-space */
 399         if (test_bit(attr_bkey, pbundle->bundle.attr_present))
 400                 return -EINVAL;
 401
 402         ret = uverbs_process_attr(pbundle, attr, uattr, attr_bkey);
 403         if (ret)
 404                 return ret;
 405
 406         __set_bit(attr_bkey, pbundle->bundle.attr_present);
 407
 408         return 0;
 409 }
 410
 411 static int ib_uverbs_run_method(struct bundle_priv *pbundle,
 412                                 unsigned int num_attrs)
 413 {
 414         int (*handler)(struct uverbs_attr_bundle *attrs);
 415         size_t uattrs_size = array_size(sizeof(*pbundle->uattrs), num_attrs);
 416         unsigned int destroy_bkey = pbundle->method_elm->destroy_bkey;
 417         unsigned int i;
 418         int ret;
 419
 420         /* See uverbs_disassociate_api() */
 421         handler = srcu_dereference(
 422                 pbundle->method_elm->handler,
 423                 &pbundle->bundle.ufile->device->disassociate_srcu);
 424         if (!handler)
 425                 return -EIO;
 426
 427         pbundle->uattrs = uverbs_alloc(&pbundle->bundle, uattrs_size);
 428         if (IS_ERR(pbundle->uattrs))
 429                 return PTR_ERR(pbundle->uattrs);
 430         if (copy_from_user(pbundle->uattrs, pbundle->user_attrs, uattrs_size))
 431                 return -EFAULT;
 432
 433         for (i = 0; i != num_attrs; i++) {
 434                 ret = uverbs_set_attr(pbundle, &pbundle->uattrs[i]);
 435                 if (unlikely(ret))
 436                         return ret;
 437         }
 438
 439         /* User space did not provide all the mandatory attributes */
 440         if (unlikely(!bitmap_subset(pbundle->method_elm->attr_mandatory,
 441                                     pbundle->bundle.attr_present,
 442                                     pbundle->method_elm->key_bitmap_len)))
 443                 return -EINVAL;
 444
 445         if (pbundle->method_elm->has_udata)
 446                 uverbs_fill_udata(&pbundle->bundle,
 447                                   &pbundle->bundle.driver_udata,
 448                                   UVERBS_ATTR_UHW_IN, UVERBS_ATTR_UHW_OUT);
 449         else
 450                 pbundle->bundle.driver_udata = (struct ib_udata){};
 451
 452         if (destroy_bkey != UVERBS_API_ATTR_BKEY_LEN) {
 453                 struct uverbs_obj_attr *destroy_attr =
 454                         &pbundle->bundle.attrs[destroy_bkey].obj_attr;
 455
 456                 ret = uobj_destroy(destroy_attr->uobject, &pbundle->bundle);
 457                 if (ret)
 458                         return ret;
 459                 __clear_bit(destroy_bkey, pbundle->uobj_finalize);
 460
 461                 ret = handler(&pbundle->bundle);
 462                 uobj_put_destroy(destroy_attr->uobject);
 463         } else {
 464                 ret = handler(&pbundle->bundle);
 465         }
 466
 467         /*
 468          * Until the drivers are revised to use the bundle directly we have to
 469          * assume that the driver wrote to its UHW_OUT and flag userspace
 470          * appropriately.
 471          */
 472         if (!ret && pbundle->method_elm->has_udata) {
 473                 const struct uverbs_attr *attr =
 474                         uverbs_attr_get(&pbundle->bundle, UVERBS_ATTR_UHW_OUT);
 475
 476                 if (!IS_ERR(attr))
 477                         ret = uverbs_set_output(&pbundle->bundle, attr);
 478         }
 479
 480         /*
 481          * EPROTONOSUPPORT is ONLY to be returned if the ioctl framework can
 482          * not invoke the method because the request is not supported.  No
 483          * other cases should return this code.
 484          */
 485         if (WARN_ON_ONCE(ret == -EPROTONOSUPPORT))
 486                 return -EINVAL;
 487
 488         return ret;
 489 }
 490
 491 static void bundle_destroy(struct bundle_priv *pbundle, bool commit)
 492 {
 493         unsigned int key_bitmap_len = pbundle->method_elm->key_bitmap_len;
 494         struct bundle_alloc_head *memblock;
 495         unsigned int i;
 496
 497         /* fast path for simple uobjects */
 498         i = -1;
 499         while ((i = find_next_bit(pbundle->uobj_finalize, key_bitmap_len,
 500                                   i + 1)) < key_bitmap_len) {
 501                 struct uverbs_attr *attr = &pbundle->bundle.attrs[i];
 502
 503                 uverbs_finalize_object(
 504                         attr->obj_attr.uobject,
 505                         attr->obj_attr.attr_elm->spec.u.obj.access, commit,
 506                         &pbundle->bundle);
 507         }
 508
 509         i = -1;
 510         while ((i = find_next_bit(pbundle->spec_finalize, key_bitmap_len,
 511                                   i + 1)) < key_bitmap_len) {
 512                 struct uverbs_attr *attr = &pbundle->bundle.attrs[i];
 513                 const struct uverbs_api_attr *attr_uapi;
 514                 void __rcu **slot;
 515
 516                 slot = uapi_get_attr_for_method(
 517                         pbundle,
 518                         pbundle->method_key | uapi_bkey_to_key_attr(i));
 519                 if (WARN_ON(!slot))
 520                         continue;
 521
 522                 attr_uapi = rcu_dereference_protected(*slot, true);
 523
 524                 if (attr_uapi->spec.type == UVERBS_ATTR_TYPE_IDRS_ARRAY) {
 525                         uverbs_free_idrs_array(attr_uapi, &attr->objs_arr_attr,
 526                                                commit, &pbundle->bundle);
 527                 }
 528         }
 529
 530         for (memblock = pbundle->allocated_mem; memblock;) {
 531                 struct bundle_alloc_head *tmp = memblock;
 532
 533                 memblock = memblock->next;
 534                 kvfree(tmp);
 535         }
 536 }
 537
 538 static int ib_uverbs_cmd_verbs(struct ib_uverbs_file *ufile,
 539                                struct ib_uverbs_ioctl_hdr *hdr,
 540                                struct ib_uverbs_attr __user *user_attrs)
 541 {
 542         const struct uverbs_api_ioctl_method *method_elm;
 543         struct uverbs_api *uapi = ufile->device->uapi;
 544         struct radix_tree_iter attrs_iter;
 545         struct bundle_priv *pbundle;
 546         struct bundle_priv onstack;
 547         void __rcu **slot;
 548         int ret;
 549
 550         if (unlikely(hdr->driver_id != uapi->driver_id))
 551                 return -EINVAL;
 552
 553         slot = radix_tree_iter_lookup(
 554                 &uapi->radix, &attrs_iter,
 555                 uapi_key_obj(hdr->object_id) |
 556                         uapi_key_ioctl_method(hdr->method_id));
 557         if (unlikely(!slot))
 558                 return -EPROTONOSUPPORT;
 559         method_elm = rcu_dereference_protected(*slot, true);
 560
 561         if (!method_elm->use_stack) {
 562                 pbundle = kmalloc(method_elm->bundle_size, GFP_KERNEL);
 563                 if (!pbundle)
 564                         return -ENOMEM;
 565                 pbundle->internal_avail =
 566                         method_elm->bundle_size -
 567                         offsetof(struct bundle_priv, internal_buffer);
 568                 pbundle->alloc_head.next = NULL;
 569                 pbundle->allocated_mem = &pbundle->alloc_head;
 570         } else {
 571                 pbundle = &onstack;
 572                 pbundle->internal_avail = sizeof(pbundle->internal_buffer);
 573                 pbundle->allocated_mem = NULL;
 574         }
 575
 576         /* Space for the pbundle->bundle.attrs flex array */
 577         pbundle->method_elm = method_elm;
 578         pbundle->method_key = attrs_iter.index;
 579         pbundle->bundle.ufile = ufile;
 580         pbundle->bundle.context = NULL; /* only valid if bundle has uobject */
 581         pbundle->radix = &uapi->radix;
 582         pbundle->radix_slots = slot;
 583         pbundle->radix_slots_len = radix_tree_chunk_size(&attrs_iter);
 584         pbundle->user_attrs = user_attrs;
 585
 586         pbundle->internal_used = ALIGN(pbundle->method_elm->key_bitmap_len *
 587                                                sizeof(*pbundle->bundle.attrs),
 588                                        sizeof(*pbundle->internal_buffer));
 589         memset(pbundle->bundle.attr_present, 0,
 590                sizeof(pbundle->bundle.attr_present));
 591         memset(pbundle->uobj_finalize, 0, sizeof(pbundle->uobj_finalize));
 592         memset(pbundle->spec_finalize, 0, sizeof(pbundle->spec_finalize));
 593
 594         ret = ib_uverbs_run_method(pbundle, hdr->num_attrs);
 595         bundle_destroy(pbundle, ret == 0);
 596         return ret;
 597 }
 598
 599 long ib_uverbs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 600 {
 601         struct ib_uverbs_file *file = filp->private_data;
 602         struct ib_uverbs_ioctl_hdr __user *user_hdr =
 603                 (struct ib_uverbs_ioctl_hdr __user *)arg;
 604         struct ib_uverbs_ioctl_hdr hdr;
 605         int srcu_key;
 606         int err;
 607
 608         if (unlikely(cmd != RDMA_VERBS_IOCTL))
 609                 return -ENOIOCTLCMD;
 610
 611         err = copy_from_user(&hdr, user_hdr, sizeof(hdr));
 612         if (err)
 613                 return -EFAULT;
 614
 615         if (hdr.length > PAGE_SIZE ||
 616             hdr.length != struct_size(&hdr, attrs, hdr.num_attrs))
 617                 return -EINVAL;
 618
 619         if (hdr.reserved1 || hdr.reserved2)
 620                 return -EPROTONOSUPPORT;
 621
 622         srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
 623         err = ib_uverbs_cmd_verbs(file, &hdr, user_hdr->attrs);
 624         srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
 625         return err;
 626 }
 627
 628 int uverbs_get_flags64(u64 *to, const struct uverbs_attr_bundle *attrs_bundle,
 629                        size_t idx, u64 allowed_bits)
 630 {
 631         const struct uverbs_attr *attr;
 632         u64 flags;
 633
 634         attr = uverbs_attr_get(attrs_bundle, idx);
 635         /* Missing attribute means 0 flags */
 636         if (IS_ERR(attr)) {
 637                 *to = 0;
 638                 return 0;
 639         }
 640
 641         /*
 642          * New userspace code should use 8 bytes to pass flags, but we
 643          * transparently support old userspaces that were using 4 bytes as
 644          * well.
 645          */
 646         if (attr->ptr_attr.len == 8)
 647                 flags = attr->ptr_attr.data;
 648         else if (attr->ptr_attr.len == 4)
 649                 flags = *(u32 *)&attr->ptr_attr.data;
 650         else
 651                 return -EINVAL;
 652
 653         if (flags & ~allowed_bits)
 654                 return -EINVAL;
 655
 656         *to = flags;
 657         return 0;
 658 }
 659 EXPORT_SYMBOL(uverbs_get_flags64);
 660
 661 int uverbs_get_flags32(u32 *to, const struct uverbs_attr_bundle *attrs_bundle,
 662                        size_t idx, u64 allowed_bits)
 663 {
 664         u64 flags;
 665         int ret;
 666
 667         ret = uverbs_get_flags64(&flags, attrs_bundle, idx, allowed_bits);
 668         if (ret)
 669                 return ret;
 670
 671         if (flags > U32_MAX)
 672                 return -EINVAL;
 673         *to = flags;
 674
 675         return 0;
 676 }
 677 EXPORT_SYMBOL(uverbs_get_flags32);
 678
 679 /*
 680  * Fill a ib_udata struct (core or uhw) using the given attribute IDs.
 681  * This is primarily used to convert the UVERBS_ATTR_UHW() into the
 682  * ib_udata format used by the drivers.
 683  */
 684 void uverbs_fill_udata(struct uverbs_attr_bundle *bundle,
 685                        struct ib_udata *udata, unsigned int attr_in,
 686                        unsigned int attr_out)
 687 {
 688         struct bundle_priv *pbundle =
 689                 container_of(bundle, struct bundle_priv, bundle);
 690         const struct uverbs_attr *in =
 691                 uverbs_attr_get(&pbundle->bundle, attr_in);
 692         const struct uverbs_attr *out =
 693                 uverbs_attr_get(&pbundle->bundle, attr_out);
 694
 695         if (!IS_ERR(in)) {
 696                 udata->inlen = in->ptr_attr.len;
 697                 if (uverbs_attr_ptr_is_inline(in))
 698                         udata->inbuf =
 699                                 &pbundle->user_attrs[in->ptr_attr.uattr_idx]
 700                                          .data;
 701                 else
 702                         udata->inbuf = u64_to_user_ptr(in->ptr_attr.data);
 703         } else {
 704                 udata->inbuf = NULL;
 705                 udata->inlen = 0;
 706         }
 707
 708         if (!IS_ERR(out)) {
 709                 udata->outbuf = u64_to_user_ptr(out->ptr_attr.data);
 710                 udata->outlen = out->ptr_attr.len;
 711         } else {
 712                 udata->outbuf = NULL;
 713                 udata->outlen = 0;
 714         }
 715 }
 716
 717 int uverbs_copy_to(const struct uverbs_attr_bundle *bundle, size_t idx,
 718                    const void *from, size_t size)
 719 {
 720         const struct uverbs_attr *attr = uverbs_attr_get(bundle, idx);
 721         size_t min_size;
 722
 723         if (IS_ERR(attr))
 724                 return PTR_ERR(attr);
 725
 726         min_size = min_t(size_t, attr->ptr_attr.len, size);
 727         if (copy_to_user(u64_to_user_ptr(attr->ptr_attr.data), from, min_size))
 728                 return -EFAULT;
 729
 730         return uverbs_set_output(bundle, attr);
 731 }
 732 EXPORT_SYMBOL(uverbs_copy_to);
 733
 734
 735 /*
 736  * This is only used if the caller has directly used copy_to_use to write the
 737  * data.  It signals to user space that the buffer is filled in.
 738  */
 739 int uverbs_output_written(const struct uverbs_attr_bundle *bundle, size_t idx)
 740 {
 741         const struct uverbs_attr *attr = uverbs_attr_get(bundle, idx);
 742
 743         if (IS_ERR(attr))
 744                 return PTR_ERR(attr);
 745
 746         return uverbs_set_output(bundle, attr);
 747 }
 748
 749 int _uverbs_get_const(s64 *to, const struct uverbs_attr_bundle *attrs_bundle,
 750                       size_t idx, s64 lower_bound, u64 upper_bound,
 751                       s64  *def_val)
 752 {
 753         const struct uverbs_attr *attr;
 754
 755         attr = uverbs_attr_get(attrs_bundle, idx);
 756         if (IS_ERR(attr)) {
 757                 if ((PTR_ERR(attr) != -ENOENT) || !def_val)
 758                         return PTR_ERR(attr);
 759
 760                 *to = *def_val;
 761         } else {
 762                 *to = attr->ptr_attr.data;
 763         }
 764
 765         if (*to < lower_bound || (*to > 0 && (u64)*to > upper_bound))
 766                 return -EINVAL;
 767
 768         return 0;
 769 }
 770 EXPORT_SYMBOL(_uverbs_get_const);
 771
 772 int uverbs_copy_to_struct_or_zero(const struct uverbs_attr_bundle *bundle,
 773                                   size_t idx, const void *from, size_t size)
 774 {
 775         const struct uverbs_attr *attr = uverbs_attr_get(bundle, idx);
 776
 777         if (IS_ERR(attr))
 778                 return PTR_ERR(attr);
 779
 780         if (size < attr->ptr_attr.len) {
 781                 if (clear_user(u64_to_user_ptr(attr->ptr_attr.data) + size,
 782                                attr->ptr_attr.len - size))
 783                         return -EFAULT;
 784         }
 785         return uverbs_copy_to(bundle, idx, from, size);
 786 }