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 #ifndef _UVERBS_IOCTL_ 34 #define _UVERBS_IOCTL_ 35 36 #include <rdma/uverbs_types.h> 37 #include <linux/uaccess.h> 38 #include <rdma/rdma_user_ioctl.h> 39 #include <rdma/ib_user_ioctl_verbs.h> 40 #include <rdma/ib_user_ioctl_cmds.h> 41 42 /* 43 * ======================================= 44 * Verbs action specifications 45 * ======================================= 46 */ 47 48 enum uverbs_attr_type { 49 UVERBS_ATTR_TYPE_NA, 50 UVERBS_ATTR_TYPE_PTR_IN, 51 UVERBS_ATTR_TYPE_PTR_OUT, 52 UVERBS_ATTR_TYPE_IDR, 53 UVERBS_ATTR_TYPE_FD, 54 UVERBS_ATTR_TYPE_ENUM_IN, 55 UVERBS_ATTR_TYPE_IDRS_ARRAY, 56 }; 57 58 enum uverbs_obj_access { 59 UVERBS_ACCESS_READ, 60 UVERBS_ACCESS_WRITE, 61 UVERBS_ACCESS_NEW, 62 UVERBS_ACCESS_DESTROY 63 }; 64 65 /* Specification of a single attribute inside the ioctl message */ 66 /* good size 16 */ 67 struct uverbs_attr_spec { 68 u8 type; 69 70 /* 71 * Support extending attributes by length. Allow the user to provide 72 * more bytes than ptr.len, but check that everything after is zero'd 73 * by the user. 74 */ 75 u8 zero_trailing:1; 76 /* 77 * Valid only for PTR_IN. Allocate and copy the data inside 78 * the parser 79 */ 80 u8 alloc_and_copy:1; 81 u8 mandatory:1; 82 /* True if this is from UVERBS_ATTR_UHW */ 83 u8 is_udata:1; 84 85 union { 86 struct { 87 /* Current known size to kernel */ 88 u16 len; 89 /* User isn't allowed to provide something < min_len */ 90 u16 min_len; 91 } ptr; 92 93 struct { 94 /* 95 * higher bits mean the namespace and lower bits mean 96 * the type id within the namespace. 97 */ 98 u16 obj_type; 99 u8 access; 100 } obj; 101 102 struct { 103 u8 num_elems; 104 } enum_def; 105 } u; 106 107 /* This weird split lets us remove some padding */ 108 union { 109 struct { 110 /* 111 * The enum attribute can select one of the attributes 112 * contained in the ids array. Currently only PTR_IN 113 * attributes are supported in the ids array. 114 */ 115 const struct uverbs_attr_spec *ids; 116 } enum_def; 117 118 struct { 119 /* 120 * higher bits mean the namespace and lower bits mean 121 * the type id within the namespace. 122 */ 123 u16 obj_type; 124 u16 min_len; 125 u16 max_len; 126 u8 access; 127 } objs_arr; 128 } u2; 129 }; 130 131 /* 132 * Information about the API is loaded into a radix tree. For IOCTL we start 133 * with a tuple of: 134 * object_id, attr_id, method_id 135 * 136 * Which is a 48 bit value, with most of the bits guaranteed to be zero. Based 137 * on the current kernel support this is compressed into 16 bit key for the 138 * radix tree. Since this compression is entirely internal to the kernel the 139 * below limits can be revised if the kernel gains additional data. 140 * 141 * With 64 leafs per node this is a 3 level radix tree. 142 * 143 * The tree encodes multiple types, and uses a scheme where OBJ_ID,0,0 returns 144 * the object slot, and OBJ_ID,METH_ID,0 and returns the method slot. 145 * 146 * This also encodes the tables for the write() and write() extended commands 147 * using the coding 148 * OBJ_ID,UVERBS_API_METHOD_IS_WRITE,command # 149 * OBJ_ID,UVERBS_API_METHOD_IS_WRITE_EX,command_ex # 150 * ie the WRITE path is treated as a special method type in the ioctl 151 * framework. 152 */ 153 enum uapi_radix_data { 154 UVERBS_API_NS_FLAG = 1U << UVERBS_ID_NS_SHIFT, 155 156 UVERBS_API_ATTR_KEY_BITS = 6, 157 UVERBS_API_ATTR_KEY_MASK = GENMASK(UVERBS_API_ATTR_KEY_BITS - 1, 0), 158 UVERBS_API_ATTR_BKEY_LEN = (1 << UVERBS_API_ATTR_KEY_BITS) - 1, 159 UVERBS_API_WRITE_KEY_NUM = 1 << UVERBS_API_ATTR_KEY_BITS, 160 161 UVERBS_API_METHOD_KEY_BITS = 5, 162 UVERBS_API_METHOD_KEY_SHIFT = UVERBS_API_ATTR_KEY_BITS, 163 UVERBS_API_METHOD_KEY_NUM_CORE = 22, 164 UVERBS_API_METHOD_IS_WRITE = 30 << UVERBS_API_METHOD_KEY_SHIFT, 165 UVERBS_API_METHOD_IS_WRITE_EX = 31 << UVERBS_API_METHOD_KEY_SHIFT, 166 UVERBS_API_METHOD_KEY_NUM_DRIVER = 167 (UVERBS_API_METHOD_IS_WRITE >> UVERBS_API_METHOD_KEY_SHIFT) - 168 UVERBS_API_METHOD_KEY_NUM_CORE, 169 UVERBS_API_METHOD_KEY_MASK = GENMASK( 170 UVERBS_API_METHOD_KEY_BITS + UVERBS_API_METHOD_KEY_SHIFT - 1, 171 UVERBS_API_METHOD_KEY_SHIFT), 172 173 UVERBS_API_OBJ_KEY_BITS = 5, 174 UVERBS_API_OBJ_KEY_SHIFT = 175 UVERBS_API_METHOD_KEY_BITS + UVERBS_API_METHOD_KEY_SHIFT, 176 UVERBS_API_OBJ_KEY_NUM_CORE = 20, 177 UVERBS_API_OBJ_KEY_NUM_DRIVER = 178 (1 << UVERBS_API_OBJ_KEY_BITS) - UVERBS_API_OBJ_KEY_NUM_CORE, 179 UVERBS_API_OBJ_KEY_MASK = GENMASK(31, UVERBS_API_OBJ_KEY_SHIFT), 180 181 /* This id guaranteed to not exist in the radix tree */ 182 UVERBS_API_KEY_ERR = 0xFFFFFFFF, 183 }; 184 185 static inline __attribute_const__ u32 uapi_key_obj(u32 id) 186 { 187 if (id & UVERBS_API_NS_FLAG) { 188 id &= ~UVERBS_API_NS_FLAG; 189 if (id >= UVERBS_API_OBJ_KEY_NUM_DRIVER) 190 return UVERBS_API_KEY_ERR; 191 id = id + UVERBS_API_OBJ_KEY_NUM_CORE; 192 } else { 193 if (id >= UVERBS_API_OBJ_KEY_NUM_CORE) 194 return UVERBS_API_KEY_ERR; 195 } 196 197 return id << UVERBS_API_OBJ_KEY_SHIFT; 198 } 199 200 static inline __attribute_const__ bool uapi_key_is_object(u32 key) 201 { 202 return (key & ~UVERBS_API_OBJ_KEY_MASK) == 0; 203 } 204 205 static inline __attribute_const__ u32 uapi_key_ioctl_method(u32 id) 206 { 207 if (id & UVERBS_API_NS_FLAG) { 208 id &= ~UVERBS_API_NS_FLAG; 209 if (id >= UVERBS_API_METHOD_KEY_NUM_DRIVER) 210 return UVERBS_API_KEY_ERR; 211 id = id + UVERBS_API_METHOD_KEY_NUM_CORE; 212 } else { 213 id++; 214 if (id >= UVERBS_API_METHOD_KEY_NUM_CORE) 215 return UVERBS_API_KEY_ERR; 216 } 217 218 return id << UVERBS_API_METHOD_KEY_SHIFT; 219 } 220 221 static inline __attribute_const__ u32 uapi_key_write_method(u32 id) 222 { 223 if (id >= UVERBS_API_WRITE_KEY_NUM) 224 return UVERBS_API_KEY_ERR; 225 return UVERBS_API_METHOD_IS_WRITE | id; 226 } 227 228 static inline __attribute_const__ u32 uapi_key_write_ex_method(u32 id) 229 { 230 if (id >= UVERBS_API_WRITE_KEY_NUM) 231 return UVERBS_API_KEY_ERR; 232 return UVERBS_API_METHOD_IS_WRITE_EX | id; 233 } 234 235 static inline __attribute_const__ u32 236 uapi_key_attr_to_ioctl_method(u32 attr_key) 237 { 238 return attr_key & 239 (UVERBS_API_OBJ_KEY_MASK | UVERBS_API_METHOD_KEY_MASK); 240 } 241 242 static inline __attribute_const__ bool uapi_key_is_ioctl_method(u32 key) 243 { 244 unsigned int method = key & UVERBS_API_METHOD_KEY_MASK; 245 246 return method != 0 && method < UVERBS_API_METHOD_IS_WRITE && 247 (key & UVERBS_API_ATTR_KEY_MASK) == 0; 248 } 249 250 static inline __attribute_const__ bool uapi_key_is_write_method(u32 key) 251 { 252 return (key & UVERBS_API_METHOD_KEY_MASK) == UVERBS_API_METHOD_IS_WRITE; 253 } 254 255 static inline __attribute_const__ bool uapi_key_is_write_ex_method(u32 key) 256 { 257 return (key & UVERBS_API_METHOD_KEY_MASK) == 258 UVERBS_API_METHOD_IS_WRITE_EX; 259 } 260 261 static inline __attribute_const__ u32 uapi_key_attrs_start(u32 ioctl_method_key) 262 { 263 /* 0 is the method slot itself */ 264 return ioctl_method_key + 1; 265 } 266 267 static inline __attribute_const__ u32 uapi_key_attr(u32 id) 268 { 269 /* 270 * The attr is designed to fit in the typical single radix tree node 271 * of 64 entries. Since allmost all methods have driver attributes we 272 * organize things so that the driver and core attributes interleave to 273 * reduce the length of the attributes array in typical cases. 274 */ 275 if (id & UVERBS_API_NS_FLAG) { 276 id &= ~UVERBS_API_NS_FLAG; 277 id++; 278 if (id >= 1 << (UVERBS_API_ATTR_KEY_BITS - 1)) 279 return UVERBS_API_KEY_ERR; 280 id = (id << 1) | 0; 281 } else { 282 if (id >= 1 << (UVERBS_API_ATTR_KEY_BITS - 1)) 283 return UVERBS_API_KEY_ERR; 284 id = (id << 1) | 1; 285 } 286 287 return id; 288 } 289 290 /* Only true for ioctl methods */ 291 static inline __attribute_const__ bool uapi_key_is_attr(u32 key) 292 { 293 unsigned int method = key & UVERBS_API_METHOD_KEY_MASK; 294 295 return method != 0 && method < UVERBS_API_METHOD_IS_WRITE && 296 (key & UVERBS_API_ATTR_KEY_MASK) != 0; 297 } 298 299 /* 300 * This returns a value in the range [0 to UVERBS_API_ATTR_BKEY_LEN), 301 * basically it undoes the reservation of 0 in the ID numbering. attr_key 302 * must already be masked with UVERBS_API_ATTR_KEY_MASK, or be the output of 303 * uapi_key_attr(). 304 */ 305 static inline __attribute_const__ u32 uapi_bkey_attr(u32 attr_key) 306 { 307 return attr_key - 1; 308 } 309 310 static inline __attribute_const__ u32 uapi_bkey_to_key_attr(u32 attr_bkey) 311 { 312 return attr_bkey + 1; 313 } 314 315 /* 316 * ======================================= 317 * Verbs definitions 318 * ======================================= 319 */ 320 321 struct uverbs_attr_def { 322 u16 id; 323 struct uverbs_attr_spec attr; 324 }; 325 326 struct uverbs_method_def { 327 u16 id; 328 /* Combination of bits from enum UVERBS_ACTION_FLAG_XXXX */ 329 u32 flags; 330 size_t num_attrs; 331 const struct uverbs_attr_def * const (*attrs)[]; 332 int (*handler)(struct uverbs_attr_bundle *attrs); 333 }; 334 335 struct uverbs_object_def { 336 u16 id; 337 const struct uverbs_obj_type *type_attrs; 338 size_t num_methods; 339 const struct uverbs_method_def * const (*methods)[]; 340 }; 341 342 enum uapi_definition_kind { 343 UAPI_DEF_END = 0, 344 UAPI_DEF_OBJECT_START, 345 UAPI_DEF_WRITE, 346 UAPI_DEF_CHAIN_OBJ_TREE, 347 UAPI_DEF_CHAIN, 348 UAPI_DEF_IS_SUPPORTED_FUNC, 349 UAPI_DEF_IS_SUPPORTED_DEV_FN, 350 }; 351 352 enum uapi_definition_scope { 353 UAPI_SCOPE_OBJECT = 1, 354 UAPI_SCOPE_METHOD = 2, 355 }; 356 357 struct uapi_definition { 358 u8 kind; 359 u8 scope; 360 union { 361 struct { 362 u16 object_id; 363 } object_start; 364 struct { 365 u16 command_num; 366 u8 is_ex:1; 367 u8 has_udata:1; 368 u8 has_resp:1; 369 u8 req_size; 370 u8 resp_size; 371 } write; 372 }; 373 374 union { 375 bool (*func_is_supported)(struct ib_device *device); 376 int (*func_write)(struct uverbs_attr_bundle *attrs); 377 const struct uapi_definition *chain; 378 const struct uverbs_object_def *chain_obj_tree; 379 size_t needs_fn_offset; 380 }; 381 }; 382 383 /* Define things connected to object_id */ 384 #define DECLARE_UVERBS_OBJECT(_object_id, ...) \ 385 { \ 386 .kind = UAPI_DEF_OBJECT_START, \ 387 .object_start = { .object_id = _object_id }, \ 388 }, \ 389 ##__VA_ARGS__ 390 391 /* Use in a var_args of DECLARE_UVERBS_OBJECT */ 392 #define DECLARE_UVERBS_WRITE(_command_num, _func, _cmd_desc, ...) \ 393 { \ 394 .kind = UAPI_DEF_WRITE, \ 395 .scope = UAPI_SCOPE_OBJECT, \ 396 .write = { .is_ex = 0, .command_num = _command_num }, \ 397 .func_write = _func, \ 398 _cmd_desc, \ 399 }, \ 400 ##__VA_ARGS__ 401 402 /* Use in a var_args of DECLARE_UVERBS_OBJECT */ 403 #define DECLARE_UVERBS_WRITE_EX(_command_num, _func, _cmd_desc, ...) \ 404 { \ 405 .kind = UAPI_DEF_WRITE, \ 406 .scope = UAPI_SCOPE_OBJECT, \ 407 .write = { .is_ex = 1, .command_num = _command_num }, \ 408 .func_write = _func, \ 409 _cmd_desc, \ 410 }, \ 411 ##__VA_ARGS__ 412 413 /* 414 * Object is only supported if the function pointer named ibdev_fn in struct 415 * ib_device is not NULL. 416 */ 417 #define UAPI_DEF_OBJ_NEEDS_FN(ibdev_fn) \ 418 { \ 419 .kind = UAPI_DEF_IS_SUPPORTED_DEV_FN, \ 420 .scope = UAPI_SCOPE_OBJECT, \ 421 .needs_fn_offset = \ 422 offsetof(struct ib_device_ops, ibdev_fn) + \ 423 BUILD_BUG_ON_ZERO(sizeof_field(struct ib_device_ops, \ 424 ibdev_fn) != \ 425 sizeof(void *)), \ 426 } 427 428 /* 429 * Method is only supported if the function pointer named ibdev_fn in struct 430 * ib_device is not NULL. 431 */ 432 #define UAPI_DEF_METHOD_NEEDS_FN(ibdev_fn) \ 433 { \ 434 .kind = UAPI_DEF_IS_SUPPORTED_DEV_FN, \ 435 .scope = UAPI_SCOPE_METHOD, \ 436 .needs_fn_offset = \ 437 offsetof(struct ib_device_ops, ibdev_fn) + \ 438 BUILD_BUG_ON_ZERO(sizeof_field(struct ib_device_ops, \ 439 ibdev_fn) != \ 440 sizeof(void *)), \ 441 } 442 443 /* Call a function to determine if the entire object is supported or not */ 444 #define UAPI_DEF_IS_OBJ_SUPPORTED(_func) \ 445 { \ 446 .kind = UAPI_DEF_IS_SUPPORTED_FUNC, \ 447 .scope = UAPI_SCOPE_OBJECT, .func_is_supported = _func, \ 448 } 449 450 /* Include another struct uapi_definition in this one */ 451 #define UAPI_DEF_CHAIN(_def_var) \ 452 { \ 453 .kind = UAPI_DEF_CHAIN, .chain = _def_var, \ 454 } 455 456 /* Temporary until the tree base description is replaced */ 457 #define UAPI_DEF_CHAIN_OBJ_TREE(_object_enum, _object_ptr, ...) \ 458 { \ 459 .kind = UAPI_DEF_CHAIN_OBJ_TREE, \ 460 .object_start = { .object_id = _object_enum }, \ 461 .chain_obj_tree = _object_ptr, \ 462 }, \ 463 ##__VA_ARGS__ 464 #define UAPI_DEF_CHAIN_OBJ_TREE_NAMED(_object_enum, ...) \ 465 UAPI_DEF_CHAIN_OBJ_TREE(_object_enum, &UVERBS_OBJECT(_object_enum), \ 466 ##__VA_ARGS__) 467 468 /* 469 * ======================================= 470 * Attribute Specifications 471 * ======================================= 472 */ 473 474 #define UVERBS_ATTR_SIZE(_min_len, _len) \ 475 .u.ptr.min_len = _min_len, .u.ptr.len = _len 476 477 #define UVERBS_ATTR_NO_DATA() UVERBS_ATTR_SIZE(0, 0) 478 479 /* 480 * Specifies a uapi structure that cannot be extended. The user must always 481 * supply the whole structure and nothing more. The structure must be declared 482 * in a header under include/uapi/rdma. 483 */ 484 #define UVERBS_ATTR_TYPE(_type) \ 485 .u.ptr.min_len = sizeof(_type), .u.ptr.len = sizeof(_type) 486 /* 487 * Specifies a uapi structure where the user must provide at least up to 488 * member 'last'. Anything after last and up until the end of the structure 489 * can be non-zero, anything longer than the end of the structure must be 490 * zero. The structure must be declared in a header under include/uapi/rdma. 491 */ 492 #define UVERBS_ATTR_STRUCT(_type, _last) \ 493 .zero_trailing = 1, \ 494 UVERBS_ATTR_SIZE(offsetofend(_type, _last), sizeof(_type)) 495 /* 496 * Specifies at least min_len bytes must be passed in, but the amount can be 497 * larger, up to the protocol maximum size. No check for zeroing is done. 498 */ 499 #define UVERBS_ATTR_MIN_SIZE(_min_len) UVERBS_ATTR_SIZE(_min_len, USHRT_MAX) 500 501 /* Must be used in the '...' of any UVERBS_ATTR */ 502 #define UA_ALLOC_AND_COPY .alloc_and_copy = 1 503 #define UA_MANDATORY .mandatory = 1 504 #define UA_OPTIONAL .mandatory = 0 505 506 /* 507 * min_len must be bigger than 0 and _max_len must be smaller than 4095. Only 508 * READ\WRITE accesses are supported. 509 */ 510 #define UVERBS_ATTR_IDRS_ARR(_attr_id, _idr_type, _access, _min_len, _max_len, \ 511 ...) \ 512 (&(const struct uverbs_attr_def){ \ 513 .id = (_attr_id) + \ 514 BUILD_BUG_ON_ZERO((_min_len) == 0 || \ 515 (_max_len) > \ 516 PAGE_SIZE / sizeof(void *) || \ 517 (_min_len) > (_max_len) || \ 518 (_access) == UVERBS_ACCESS_NEW || \ 519 (_access) == UVERBS_ACCESS_DESTROY), \ 520 .attr = { .type = UVERBS_ATTR_TYPE_IDRS_ARRAY, \ 521 .u2.objs_arr.obj_type = _idr_type, \ 522 .u2.objs_arr.access = _access, \ 523 .u2.objs_arr.min_len = _min_len, \ 524 .u2.objs_arr.max_len = _max_len, \ 525 __VA_ARGS__ } }) 526 527 /* 528 * Only for use with UVERBS_ATTR_IDR, allows any uobject type to be accepted, 529 * the user must validate the type of the uobject instead. 530 */ 531 #define UVERBS_IDR_ANY_OBJECT 0xFFFF 532 533 #define UVERBS_ATTR_IDR(_attr_id, _idr_type, _access, ...) \ 534 (&(const struct uverbs_attr_def){ \ 535 .id = _attr_id, \ 536 .attr = { .type = UVERBS_ATTR_TYPE_IDR, \ 537 .u.obj.obj_type = _idr_type, \ 538 .u.obj.access = _access, \ 539 __VA_ARGS__ } }) 540 541 #define UVERBS_ATTR_FD(_attr_id, _fd_type, _access, ...) \ 542 (&(const struct uverbs_attr_def){ \ 543 .id = (_attr_id) + \ 544 BUILD_BUG_ON_ZERO((_access) != UVERBS_ACCESS_NEW && \ 545 (_access) != UVERBS_ACCESS_READ), \ 546 .attr = { .type = UVERBS_ATTR_TYPE_FD, \ 547 .u.obj.obj_type = _fd_type, \ 548 .u.obj.access = _access, \ 549 __VA_ARGS__ } }) 550 551 #define UVERBS_ATTR_PTR_IN(_attr_id, _type, ...) \ 552 (&(const struct uverbs_attr_def){ \ 553 .id = _attr_id, \ 554 .attr = { .type = UVERBS_ATTR_TYPE_PTR_IN, \ 555 _type, \ 556 __VA_ARGS__ } }) 557 558 #define UVERBS_ATTR_PTR_OUT(_attr_id, _type, ...) \ 559 (&(const struct uverbs_attr_def){ \ 560 .id = _attr_id, \ 561 .attr = { .type = UVERBS_ATTR_TYPE_PTR_OUT, \ 562 _type, \ 563 __VA_ARGS__ } }) 564 565 /* _enum_arry should be a 'static const union uverbs_attr_spec[]' */ 566 #define UVERBS_ATTR_ENUM_IN(_attr_id, _enum_arr, ...) \ 567 (&(const struct uverbs_attr_def){ \ 568 .id = _attr_id, \ 569 .attr = { .type = UVERBS_ATTR_TYPE_ENUM_IN, \ 570 .u2.enum_def.ids = _enum_arr, \ 571 .u.enum_def.num_elems = ARRAY_SIZE(_enum_arr), \ 572 __VA_ARGS__ }, \ 573 }) 574 575 /* An input value that is a member in the enum _enum_type. */ 576 #define UVERBS_ATTR_CONST_IN(_attr_id, _enum_type, ...) \ 577 UVERBS_ATTR_PTR_IN( \ 578 _attr_id, \ 579 UVERBS_ATTR_SIZE( \ 580 sizeof(u64) + BUILD_BUG_ON_ZERO(!sizeof(_enum_type)), \ 581 sizeof(u64)), \ 582 __VA_ARGS__) 583 584 /* 585 * An input value that is a bitwise combination of values of _enum_type. 586 * This permits the flag value to be passed as either a u32 or u64, it must 587 * be retrieved via uverbs_get_flag(). 588 */ 589 #define UVERBS_ATTR_FLAGS_IN(_attr_id, _enum_type, ...) \ 590 UVERBS_ATTR_PTR_IN( \ 591 _attr_id, \ 592 UVERBS_ATTR_SIZE(sizeof(u32) + BUILD_BUG_ON_ZERO( \ 593 !sizeof(_enum_type *)), \ 594 sizeof(u64)), \ 595 __VA_ARGS__) 596 597 /* 598 * This spec is used in order to pass information to the hardware driver in a 599 * legacy way. Every verb that could get driver specific data should get this 600 * spec. 601 */ 602 #define UVERBS_ATTR_UHW() \ 603 UVERBS_ATTR_PTR_IN(UVERBS_ATTR_UHW_IN, \ 604 UVERBS_ATTR_MIN_SIZE(0), \ 605 UA_OPTIONAL, \ 606 .is_udata = 1), \ 607 UVERBS_ATTR_PTR_OUT(UVERBS_ATTR_UHW_OUT, \ 608 UVERBS_ATTR_MIN_SIZE(0), \ 609 UA_OPTIONAL, \ 610 .is_udata = 1) 611 612 /* ================================================= 613 * Parsing infrastructure 614 * ================================================= 615 */ 616 617 618 struct uverbs_ptr_attr { 619 /* 620 * If UVERBS_ATTR_SPEC_F_ALLOC_AND_COPY is set then the 'ptr' is 621 * used. 622 */ 623 union { 624 void *ptr; 625 u64 data; 626 }; 627 u16 len; 628 u16 uattr_idx; 629 u8 enum_id; 630 }; 631 632 struct uverbs_obj_attr { 633 struct ib_uobject *uobject; 634 const struct uverbs_api_attr *attr_elm; 635 }; 636 637 struct uverbs_objs_arr_attr { 638 struct ib_uobject **uobjects; 639 u16 len; 640 }; 641 642 struct uverbs_attr { 643 union { 644 struct uverbs_ptr_attr ptr_attr; 645 struct uverbs_obj_attr obj_attr; 646 struct uverbs_objs_arr_attr objs_arr_attr; 647 }; 648 }; 649 650 struct uverbs_attr_bundle { 651 struct ib_udata driver_udata; 652 struct ib_udata ucore; 653 struct ib_uverbs_file *ufile; 654 struct ib_ucontext *context; 655 DECLARE_BITMAP(attr_present, UVERBS_API_ATTR_BKEY_LEN); 656 struct uverbs_attr attrs[]; 657 }; 658 659 static inline bool uverbs_attr_is_valid(const struct uverbs_attr_bundle *attrs_bundle, 660 unsigned int idx) 661 { 662 return test_bit(uapi_bkey_attr(uapi_key_attr(idx)), 663 attrs_bundle->attr_present); 664 } 665 666 /** 667 * rdma_udata_to_drv_context - Helper macro to get the driver's context out of 668 * ib_udata which is embedded in uverbs_attr_bundle. 669 * 670 * If udata is not NULL this cannot fail. Otherwise a NULL udata will result 671 * in a NULL ucontext pointer, as a safety precaution. Callers should be using 672 * 'udata' to determine if the driver call is in user or kernel mode, not 673 * 'ucontext'. 674 * 675 */ 676 #define rdma_udata_to_drv_context(udata, drv_dev_struct, member) \ 677 (udata ? container_of(container_of(udata, struct uverbs_attr_bundle, \ 678 driver_udata) \ 679 ->context, \ 680 drv_dev_struct, member) : \ 681 (drv_dev_struct *)NULL) 682 683 #define IS_UVERBS_COPY_ERR(_ret) ((_ret) && (_ret) != -ENOENT) 684 685 static inline const struct uverbs_attr *uverbs_attr_get(const struct uverbs_attr_bundle *attrs_bundle, 686 u16 idx) 687 { 688 if (!uverbs_attr_is_valid(attrs_bundle, idx)) 689 return ERR_PTR(-ENOENT); 690 691 return &attrs_bundle->attrs[uapi_bkey_attr(uapi_key_attr(idx))]; 692 } 693 694 static inline int uverbs_attr_get_enum_id(const struct uverbs_attr_bundle *attrs_bundle, 695 u16 idx) 696 { 697 const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx); 698 699 if (IS_ERR(attr)) 700 return PTR_ERR(attr); 701 702 return attr->ptr_attr.enum_id; 703 } 704 705 static inline void *uverbs_attr_get_obj(const struct uverbs_attr_bundle *attrs_bundle, 706 u16 idx) 707 { 708 const struct uverbs_attr *attr; 709 710 attr = uverbs_attr_get(attrs_bundle, idx); 711 if (IS_ERR(attr)) 712 return ERR_CAST(attr); 713 714 return attr->obj_attr.uobject->object; 715 } 716 717 static inline struct ib_uobject *uverbs_attr_get_uobject(const struct uverbs_attr_bundle *attrs_bundle, 718 u16 idx) 719 { 720 const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx); 721 722 if (IS_ERR(attr)) 723 return ERR_CAST(attr); 724 725 return attr->obj_attr.uobject; 726 } 727 728 static inline int 729 uverbs_attr_get_len(const struct uverbs_attr_bundle *attrs_bundle, u16 idx) 730 { 731 const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx); 732 733 if (IS_ERR(attr)) 734 return PTR_ERR(attr); 735 736 return attr->ptr_attr.len; 737 } 738 739 void uverbs_finalize_uobj_create(const struct uverbs_attr_bundle *attrs_bundle, 740 u16 idx); 741 742 /* 743 * uverbs_attr_ptr_get_array_size() - Get array size pointer by a ptr 744 * attribute. 745 * @attrs: The attribute bundle 746 * @idx: The ID of the attribute 747 * @elem_size: The size of the element in the array 748 */ 749 static inline int 750 uverbs_attr_ptr_get_array_size(struct uverbs_attr_bundle *attrs, u16 idx, 751 size_t elem_size) 752 { 753 int size = uverbs_attr_get_len(attrs, idx); 754 755 if (size < 0) 756 return size; 757 758 if (size % elem_size) 759 return -EINVAL; 760 761 return size / elem_size; 762 } 763 764 /** 765 * uverbs_attr_get_uobjs_arr() - Provides array's properties for attribute for 766 * UVERBS_ATTR_TYPE_IDRS_ARRAY. 767 * @arr: Returned pointer to array of pointers for uobjects or NULL if 768 * the attribute isn't provided. 769 * 770 * Return: The array length or 0 if no attribute was provided. 771 */ 772 static inline int uverbs_attr_get_uobjs_arr( 773 const struct uverbs_attr_bundle *attrs_bundle, u16 attr_idx, 774 struct ib_uobject ***arr) 775 { 776 const struct uverbs_attr *attr = 777 uverbs_attr_get(attrs_bundle, attr_idx); 778 779 if (IS_ERR(attr)) { 780 *arr = NULL; 781 return 0; 782 } 783 784 *arr = attr->objs_arr_attr.uobjects; 785 786 return attr->objs_arr_attr.len; 787 } 788 789 static inline bool uverbs_attr_ptr_is_inline(const struct uverbs_attr *attr) 790 { 791 return attr->ptr_attr.len <= sizeof(attr->ptr_attr.data); 792 } 793 794 static inline void *uverbs_attr_get_alloced_ptr( 795 const struct uverbs_attr_bundle *attrs_bundle, u16 idx) 796 { 797 const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx); 798 799 if (IS_ERR(attr)) 800 return (void *)attr; 801 802 return uverbs_attr_ptr_is_inline(attr) ? (void *)&attr->ptr_attr.data : 803 attr->ptr_attr.ptr; 804 } 805 806 static inline int _uverbs_copy_from(void *to, 807 const struct uverbs_attr_bundle *attrs_bundle, 808 size_t idx, 809 size_t size) 810 { 811 const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx); 812 813 if (IS_ERR(attr)) 814 return PTR_ERR(attr); 815 816 /* 817 * Validation ensures attr->ptr_attr.len >= size. If the caller is 818 * using UVERBS_ATTR_SPEC_F_MIN_SZ_OR_ZERO then it must call 819 * uverbs_copy_from_or_zero. 820 */ 821 if (unlikely(size < attr->ptr_attr.len)) 822 return -EINVAL; 823 824 if (uverbs_attr_ptr_is_inline(attr)) 825 memcpy(to, &attr->ptr_attr.data, attr->ptr_attr.len); 826 else if (copy_from_user(to, u64_to_user_ptr(attr->ptr_attr.data), 827 attr->ptr_attr.len)) 828 return -EFAULT; 829 830 return 0; 831 } 832 833 static inline int _uverbs_copy_from_or_zero(void *to, 834 const struct uverbs_attr_bundle *attrs_bundle, 835 size_t idx, 836 size_t size) 837 { 838 const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx); 839 size_t min_size; 840 841 if (IS_ERR(attr)) 842 return PTR_ERR(attr); 843 844 min_size = min_t(size_t, size, attr->ptr_attr.len); 845 846 if (uverbs_attr_ptr_is_inline(attr)) 847 memcpy(to, &attr->ptr_attr.data, min_size); 848 else if (copy_from_user(to, u64_to_user_ptr(attr->ptr_attr.data), 849 min_size)) 850 return -EFAULT; 851 852 if (size > min_size) 853 memset(to + min_size, 0, size - min_size); 854 855 return 0; 856 } 857 858 #define uverbs_copy_from(to, attrs_bundle, idx) \ 859 _uverbs_copy_from(to, attrs_bundle, idx, sizeof(*to)) 860 861 #define uverbs_copy_from_or_zero(to, attrs_bundle, idx) \ 862 _uverbs_copy_from_or_zero(to, attrs_bundle, idx, sizeof(*to)) 863 864 static inline struct ib_ucontext * 865 ib_uverbs_get_ucontext(const struct uverbs_attr_bundle *attrs) 866 { 867 return ib_uverbs_get_ucontext_file(attrs->ufile); 868 } 869 870 #if IS_ENABLED(CONFIG_INFINIBAND_USER_ACCESS) 871 int uverbs_get_flags64(u64 *to, const struct uverbs_attr_bundle *attrs_bundle, 872 size_t idx, u64 allowed_bits); 873 int uverbs_get_flags32(u32 *to, const struct uverbs_attr_bundle *attrs_bundle, 874 size_t idx, u64 allowed_bits); 875 int uverbs_copy_to(const struct uverbs_attr_bundle *attrs_bundle, size_t idx, 876 const void *from, size_t size); 877 __malloc void *_uverbs_alloc(struct uverbs_attr_bundle *bundle, size_t size, 878 gfp_t flags); 879 880 static inline __malloc void *uverbs_alloc(struct uverbs_attr_bundle *bundle, 881 size_t size) 882 { 883 return _uverbs_alloc(bundle, size, GFP_KERNEL); 884 } 885 886 static inline __malloc void *uverbs_zalloc(struct uverbs_attr_bundle *bundle, 887 size_t size) 888 { 889 return _uverbs_alloc(bundle, size, GFP_KERNEL | __GFP_ZERO); 890 } 891 int _uverbs_get_const(s64 *to, const struct uverbs_attr_bundle *attrs_bundle, 892 size_t idx, s64 lower_bound, u64 upper_bound, 893 s64 *def_val); 894 int uverbs_copy_to_struct_or_zero(const struct uverbs_attr_bundle *bundle, 895 size_t idx, const void *from, size_t size); 896 #else 897 static inline int 898 uverbs_get_flags64(u64 *to, const struct uverbs_attr_bundle *attrs_bundle, 899 size_t idx, u64 allowed_bits) 900 { 901 return -EINVAL; 902 } 903 static inline int 904 uverbs_get_flags32(u32 *to, const struct uverbs_attr_bundle *attrs_bundle, 905 size_t idx, u64 allowed_bits) 906 { 907 return -EINVAL; 908 } 909 static inline int uverbs_copy_to(const struct uverbs_attr_bundle *attrs_bundle, 910 size_t idx, const void *from, size_t size) 911 { 912 return -EINVAL; 913 } 914 static inline __malloc void *uverbs_alloc(struct uverbs_attr_bundle *bundle, 915 size_t size) 916 { 917 return ERR_PTR(-EINVAL); 918 } 919 static inline __malloc void *uverbs_zalloc(struct uverbs_attr_bundle *bundle, 920 size_t size) 921 { 922 return ERR_PTR(-EINVAL); 923 } 924 static inline int 925 _uverbs_get_const(s64 *to, const struct uverbs_attr_bundle *attrs_bundle, 926 size_t idx, s64 lower_bound, u64 upper_bound, 927 s64 *def_val) 928 { 929 return -EINVAL; 930 } 931 static inline int 932 uverbs_copy_to_struct_or_zero(const struct uverbs_attr_bundle *bundle, 933 size_t idx, const void *from, size_t size) 934 { 935 return -EINVAL; 936 } 937 #endif 938 939 #define uverbs_get_const(_to, _attrs_bundle, _idx) \ 940 ({ \ 941 s64 _val; \ 942 int _ret = _uverbs_get_const(&_val, _attrs_bundle, _idx, \ 943 type_min(typeof(*_to)), \ 944 type_max(typeof(*_to)), NULL); \ 945 (*_to) = _val; \ 946 _ret; \ 947 }) 948 949 #define uverbs_get_const_default(_to, _attrs_bundle, _idx, _default) \ 950 ({ \ 951 s64 _val; \ 952 s64 _def_val = _default; \ 953 int _ret = \ 954 _uverbs_get_const(&_val, _attrs_bundle, _idx, \ 955 type_min(typeof(*_to)), \ 956 type_max(typeof(*_to)), &_def_val); \ 957 (*_to) = _val; \ 958 _ret; \ 959 }) 960 #endif 961