1 /* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */ 2 /* 3 * Copyright (c) 2017, Mellanox Technologies inc. All rights reserved. 4 */ 5 6 #ifndef _UVERBS_IOCTL_ 7 #define _UVERBS_IOCTL_ 8 9 #include <rdma/uverbs_types.h> 10 #include <linux/uaccess.h> 11 #include <rdma/rdma_user_ioctl.h> 12 #include <rdma/ib_user_ioctl_verbs.h> 13 #include <rdma/ib_user_ioctl_cmds.h> 14 15 /* 16 * ======================================= 17 * Verbs action specifications 18 * ======================================= 19 */ 20 21 enum uverbs_attr_type { 22 UVERBS_ATTR_TYPE_NA, 23 UVERBS_ATTR_TYPE_PTR_IN, 24 UVERBS_ATTR_TYPE_PTR_OUT, 25 UVERBS_ATTR_TYPE_IDR, 26 UVERBS_ATTR_TYPE_FD, 27 UVERBS_ATTR_TYPE_RAW_FD, 28 UVERBS_ATTR_TYPE_ENUM_IN, 29 UVERBS_ATTR_TYPE_IDRS_ARRAY, 30 }; 31 32 enum uverbs_obj_access { 33 UVERBS_ACCESS_READ, 34 UVERBS_ACCESS_WRITE, 35 UVERBS_ACCESS_NEW, 36 UVERBS_ACCESS_DESTROY 37 }; 38 39 /* Specification of a single attribute inside the ioctl message */ 40 /* good size 16 */ 41 struct uverbs_attr_spec { 42 u8 type; 43 44 /* 45 * Support extending attributes by length. Allow the user to provide 46 * more bytes than ptr.len, but check that everything after is zero'd 47 * by the user. 48 */ 49 u8 zero_trailing:1; 50 /* 51 * Valid only for PTR_IN. Allocate and copy the data inside 52 * the parser 53 */ 54 u8 alloc_and_copy:1; 55 u8 mandatory:1; 56 /* True if this is from UVERBS_ATTR_UHW */ 57 u8 is_udata:1; 58 59 union { 60 struct { 61 /* Current known size to kernel */ 62 u16 len; 63 /* User isn't allowed to provide something < min_len */ 64 u16 min_len; 65 } ptr; 66 67 struct { 68 /* 69 * higher bits mean the namespace and lower bits mean 70 * the type id within the namespace. 71 */ 72 u16 obj_type; 73 u8 access; 74 } obj; 75 76 struct { 77 u8 num_elems; 78 } enum_def; 79 } u; 80 81 /* This weird split lets us remove some padding */ 82 union { 83 struct { 84 /* 85 * The enum attribute can select one of the attributes 86 * contained in the ids array. Currently only PTR_IN 87 * attributes are supported in the ids array. 88 */ 89 const struct uverbs_attr_spec *ids; 90 } enum_def; 91 92 struct { 93 /* 94 * higher bits mean the namespace and lower bits mean 95 * the type id within the namespace. 96 */ 97 u16 obj_type; 98 u16 min_len; 99 u16 max_len; 100 u8 access; 101 } objs_arr; 102 } u2; 103 }; 104 105 /* 106 * Information about the API is loaded into a radix tree. For IOCTL we start 107 * with a tuple of: 108 * object_id, attr_id, method_id 109 * 110 * Which is a 48 bit value, with most of the bits guaranteed to be zero. Based 111 * on the current kernel support this is compressed into 16 bit key for the 112 * radix tree. Since this compression is entirely internal to the kernel the 113 * below limits can be revised if the kernel gains additional data. 114 * 115 * With 64 leafs per node this is a 3 level radix tree. 116 * 117 * The tree encodes multiple types, and uses a scheme where OBJ_ID,0,0 returns 118 * the object slot, and OBJ_ID,METH_ID,0 and returns the method slot. 119 * 120 * This also encodes the tables for the write() and write() extended commands 121 * using the coding 122 * OBJ_ID,UVERBS_API_METHOD_IS_WRITE,command # 123 * OBJ_ID,UVERBS_API_METHOD_IS_WRITE_EX,command_ex # 124 * ie the WRITE path is treated as a special method type in the ioctl 125 * framework. 126 */ 127 enum uapi_radix_data { 128 UVERBS_API_NS_FLAG = 1U << UVERBS_ID_NS_SHIFT, 129 130 UVERBS_API_ATTR_KEY_BITS = 6, 131 UVERBS_API_ATTR_KEY_MASK = GENMASK(UVERBS_API_ATTR_KEY_BITS - 1, 0), 132 UVERBS_API_ATTR_BKEY_LEN = (1 << UVERBS_API_ATTR_KEY_BITS) - 1, 133 UVERBS_API_WRITE_KEY_NUM = 1 << UVERBS_API_ATTR_KEY_BITS, 134 135 UVERBS_API_METHOD_KEY_BITS = 5, 136 UVERBS_API_METHOD_KEY_SHIFT = UVERBS_API_ATTR_KEY_BITS, 137 UVERBS_API_METHOD_KEY_NUM_CORE = 22, 138 UVERBS_API_METHOD_IS_WRITE = 30 << UVERBS_API_METHOD_KEY_SHIFT, 139 UVERBS_API_METHOD_IS_WRITE_EX = 31 << UVERBS_API_METHOD_KEY_SHIFT, 140 UVERBS_API_METHOD_KEY_NUM_DRIVER = 141 (UVERBS_API_METHOD_IS_WRITE >> UVERBS_API_METHOD_KEY_SHIFT) - 142 UVERBS_API_METHOD_KEY_NUM_CORE, 143 UVERBS_API_METHOD_KEY_MASK = GENMASK( 144 UVERBS_API_METHOD_KEY_BITS + UVERBS_API_METHOD_KEY_SHIFT - 1, 145 UVERBS_API_METHOD_KEY_SHIFT), 146 147 UVERBS_API_OBJ_KEY_BITS = 5, 148 UVERBS_API_OBJ_KEY_SHIFT = 149 UVERBS_API_METHOD_KEY_BITS + UVERBS_API_METHOD_KEY_SHIFT, 150 UVERBS_API_OBJ_KEY_NUM_CORE = 20, 151 UVERBS_API_OBJ_KEY_NUM_DRIVER = 152 (1 << UVERBS_API_OBJ_KEY_BITS) - UVERBS_API_OBJ_KEY_NUM_CORE, 153 UVERBS_API_OBJ_KEY_MASK = GENMASK(31, UVERBS_API_OBJ_KEY_SHIFT), 154 155 /* This id guaranteed to not exist in the radix tree */ 156 UVERBS_API_KEY_ERR = 0xFFFFFFFF, 157 }; 158 159 static inline __attribute_const__ u32 uapi_key_obj(u32 id) 160 { 161 if (id & UVERBS_API_NS_FLAG) { 162 id &= ~UVERBS_API_NS_FLAG; 163 if (id >= UVERBS_API_OBJ_KEY_NUM_DRIVER) 164 return UVERBS_API_KEY_ERR; 165 id = id + UVERBS_API_OBJ_KEY_NUM_CORE; 166 } else { 167 if (id >= UVERBS_API_OBJ_KEY_NUM_CORE) 168 return UVERBS_API_KEY_ERR; 169 } 170 171 return id << UVERBS_API_OBJ_KEY_SHIFT; 172 } 173 174 static inline __attribute_const__ bool uapi_key_is_object(u32 key) 175 { 176 return (key & ~UVERBS_API_OBJ_KEY_MASK) == 0; 177 } 178 179 static inline __attribute_const__ u32 uapi_key_ioctl_method(u32 id) 180 { 181 if (id & UVERBS_API_NS_FLAG) { 182 id &= ~UVERBS_API_NS_FLAG; 183 if (id >= UVERBS_API_METHOD_KEY_NUM_DRIVER) 184 return UVERBS_API_KEY_ERR; 185 id = id + UVERBS_API_METHOD_KEY_NUM_CORE; 186 } else { 187 id++; 188 if (id >= UVERBS_API_METHOD_KEY_NUM_CORE) 189 return UVERBS_API_KEY_ERR; 190 } 191 192 return id << UVERBS_API_METHOD_KEY_SHIFT; 193 } 194 195 static inline __attribute_const__ u32 uapi_key_write_method(u32 id) 196 { 197 if (id >= UVERBS_API_WRITE_KEY_NUM) 198 return UVERBS_API_KEY_ERR; 199 return UVERBS_API_METHOD_IS_WRITE | id; 200 } 201 202 static inline __attribute_const__ u32 uapi_key_write_ex_method(u32 id) 203 { 204 if (id >= UVERBS_API_WRITE_KEY_NUM) 205 return UVERBS_API_KEY_ERR; 206 return UVERBS_API_METHOD_IS_WRITE_EX | id; 207 } 208 209 static inline __attribute_const__ u32 210 uapi_key_attr_to_ioctl_method(u32 attr_key) 211 { 212 return attr_key & 213 (UVERBS_API_OBJ_KEY_MASK | UVERBS_API_METHOD_KEY_MASK); 214 } 215 216 static inline __attribute_const__ bool uapi_key_is_ioctl_method(u32 key) 217 { 218 unsigned int method = key & UVERBS_API_METHOD_KEY_MASK; 219 220 return method != 0 && method < UVERBS_API_METHOD_IS_WRITE && 221 (key & UVERBS_API_ATTR_KEY_MASK) == 0; 222 } 223 224 static inline __attribute_const__ bool uapi_key_is_write_method(u32 key) 225 { 226 return (key & UVERBS_API_METHOD_KEY_MASK) == UVERBS_API_METHOD_IS_WRITE; 227 } 228 229 static inline __attribute_const__ bool uapi_key_is_write_ex_method(u32 key) 230 { 231 return (key & UVERBS_API_METHOD_KEY_MASK) == 232 UVERBS_API_METHOD_IS_WRITE_EX; 233 } 234 235 static inline __attribute_const__ u32 uapi_key_attrs_start(u32 ioctl_method_key) 236 { 237 /* 0 is the method slot itself */ 238 return ioctl_method_key + 1; 239 } 240 241 static inline __attribute_const__ u32 uapi_key_attr(u32 id) 242 { 243 /* 244 * The attr is designed to fit in the typical single radix tree node 245 * of 64 entries. Since allmost all methods have driver attributes we 246 * organize things so that the driver and core attributes interleave to 247 * reduce the length of the attributes array in typical cases. 248 */ 249 if (id & UVERBS_API_NS_FLAG) { 250 id &= ~UVERBS_API_NS_FLAG; 251 id++; 252 if (id >= 1 << (UVERBS_API_ATTR_KEY_BITS - 1)) 253 return UVERBS_API_KEY_ERR; 254 id = (id << 1) | 0; 255 } else { 256 if (id >= 1 << (UVERBS_API_ATTR_KEY_BITS - 1)) 257 return UVERBS_API_KEY_ERR; 258 id = (id << 1) | 1; 259 } 260 261 return id; 262 } 263 264 /* Only true for ioctl methods */ 265 static inline __attribute_const__ bool uapi_key_is_attr(u32 key) 266 { 267 unsigned int method = key & UVERBS_API_METHOD_KEY_MASK; 268 269 return method != 0 && method < UVERBS_API_METHOD_IS_WRITE && 270 (key & UVERBS_API_ATTR_KEY_MASK) != 0; 271 } 272 273 /* 274 * This returns a value in the range [0 to UVERBS_API_ATTR_BKEY_LEN), 275 * basically it undoes the reservation of 0 in the ID numbering. attr_key 276 * must already be masked with UVERBS_API_ATTR_KEY_MASK, or be the output of 277 * uapi_key_attr(). 278 */ 279 static inline __attribute_const__ u32 uapi_bkey_attr(u32 attr_key) 280 { 281 return attr_key - 1; 282 } 283 284 static inline __attribute_const__ u32 uapi_bkey_to_key_attr(u32 attr_bkey) 285 { 286 return attr_bkey + 1; 287 } 288 289 /* 290 * ======================================= 291 * Verbs definitions 292 * ======================================= 293 */ 294 295 struct uverbs_attr_def { 296 u16 id; 297 struct uverbs_attr_spec attr; 298 }; 299 300 struct uverbs_method_def { 301 u16 id; 302 /* Combination of bits from enum UVERBS_ACTION_FLAG_XXXX */ 303 u32 flags; 304 size_t num_attrs; 305 const struct uverbs_attr_def * const (*attrs)[]; 306 int (*handler)(struct uverbs_attr_bundle *attrs); 307 }; 308 309 struct uverbs_object_def { 310 u16 id; 311 const struct uverbs_obj_type *type_attrs; 312 size_t num_methods; 313 const struct uverbs_method_def * const (*methods)[]; 314 }; 315 316 enum uapi_definition_kind { 317 UAPI_DEF_END = 0, 318 UAPI_DEF_OBJECT_START, 319 UAPI_DEF_WRITE, 320 UAPI_DEF_CHAIN_OBJ_TREE, 321 UAPI_DEF_CHAIN, 322 UAPI_DEF_IS_SUPPORTED_FUNC, 323 UAPI_DEF_IS_SUPPORTED_DEV_FN, 324 }; 325 326 enum uapi_definition_scope { 327 UAPI_SCOPE_OBJECT = 1, 328 UAPI_SCOPE_METHOD = 2, 329 }; 330 331 struct uapi_definition { 332 u8 kind; 333 u8 scope; 334 union { 335 struct { 336 u16 object_id; 337 } object_start; 338 struct { 339 u16 command_num; 340 u8 is_ex:1; 341 u8 has_udata:1; 342 u8 has_resp:1; 343 u8 req_size; 344 u8 resp_size; 345 } write; 346 }; 347 348 union { 349 bool (*func_is_supported)(struct ib_device *device); 350 int (*func_write)(struct uverbs_attr_bundle *attrs); 351 const struct uapi_definition *chain; 352 const struct uverbs_object_def *chain_obj_tree; 353 size_t needs_fn_offset; 354 }; 355 }; 356 357 /* Define things connected to object_id */ 358 #define DECLARE_UVERBS_OBJECT(_object_id, ...) \ 359 { \ 360 .kind = UAPI_DEF_OBJECT_START, \ 361 .object_start = { .object_id = _object_id }, \ 362 }, \ 363 ##__VA_ARGS__ 364 365 /* Use in a var_args of DECLARE_UVERBS_OBJECT */ 366 #define DECLARE_UVERBS_WRITE(_command_num, _func, _cmd_desc, ...) \ 367 { \ 368 .kind = UAPI_DEF_WRITE, \ 369 .scope = UAPI_SCOPE_OBJECT, \ 370 .write = { .is_ex = 0, .command_num = _command_num }, \ 371 .func_write = _func, \ 372 _cmd_desc, \ 373 }, \ 374 ##__VA_ARGS__ 375 376 /* Use in a var_args of DECLARE_UVERBS_OBJECT */ 377 #define DECLARE_UVERBS_WRITE_EX(_command_num, _func, _cmd_desc, ...) \ 378 { \ 379 .kind = UAPI_DEF_WRITE, \ 380 .scope = UAPI_SCOPE_OBJECT, \ 381 .write = { .is_ex = 1, .command_num = _command_num }, \ 382 .func_write = _func, \ 383 _cmd_desc, \ 384 }, \ 385 ##__VA_ARGS__ 386 387 /* 388 * Object is only supported if the function pointer named ibdev_fn in struct 389 * ib_device is not NULL. 390 */ 391 #define UAPI_DEF_OBJ_NEEDS_FN(ibdev_fn) \ 392 { \ 393 .kind = UAPI_DEF_IS_SUPPORTED_DEV_FN, \ 394 .scope = UAPI_SCOPE_OBJECT, \ 395 .needs_fn_offset = \ 396 offsetof(struct ib_device_ops, ibdev_fn) + \ 397 BUILD_BUG_ON_ZERO(sizeof_field(struct ib_device_ops, \ 398 ibdev_fn) != \ 399 sizeof(void *)), \ 400 } 401 402 /* 403 * Method is only supported if the function pointer named ibdev_fn in struct 404 * ib_device is not NULL. 405 */ 406 #define UAPI_DEF_METHOD_NEEDS_FN(ibdev_fn) \ 407 { \ 408 .kind = UAPI_DEF_IS_SUPPORTED_DEV_FN, \ 409 .scope = UAPI_SCOPE_METHOD, \ 410 .needs_fn_offset = \ 411 offsetof(struct ib_device_ops, ibdev_fn) + \ 412 BUILD_BUG_ON_ZERO(sizeof_field(struct ib_device_ops, \ 413 ibdev_fn) != \ 414 sizeof(void *)), \ 415 } 416 417 /* Call a function to determine if the entire object is supported or not */ 418 #define UAPI_DEF_IS_OBJ_SUPPORTED(_func) \ 419 { \ 420 .kind = UAPI_DEF_IS_SUPPORTED_FUNC, \ 421 .scope = UAPI_SCOPE_OBJECT, .func_is_supported = _func, \ 422 } 423 424 /* Include another struct uapi_definition in this one */ 425 #define UAPI_DEF_CHAIN(_def_var) \ 426 { \ 427 .kind = UAPI_DEF_CHAIN, .chain = _def_var, \ 428 } 429 430 /* Temporary until the tree base description is replaced */ 431 #define UAPI_DEF_CHAIN_OBJ_TREE(_object_enum, _object_ptr, ...) \ 432 { \ 433 .kind = UAPI_DEF_CHAIN_OBJ_TREE, \ 434 .object_start = { .object_id = _object_enum }, \ 435 .chain_obj_tree = _object_ptr, \ 436 }, \ 437 ##__VA_ARGS__ 438 #define UAPI_DEF_CHAIN_OBJ_TREE_NAMED(_object_enum, ...) \ 439 UAPI_DEF_CHAIN_OBJ_TREE(_object_enum, \ 440 PTR_IF(IS_ENABLED(CONFIG_INFINIBAND_USER_ACCESS), \ 441 &UVERBS_OBJECT(_object_enum)), \ 442 ##__VA_ARGS__) 443 444 /* 445 * ======================================= 446 * Attribute Specifications 447 * ======================================= 448 */ 449 450 #define UVERBS_ATTR_SIZE(_min_len, _len) \ 451 .u.ptr.min_len = _min_len, .u.ptr.len = _len 452 453 #define UVERBS_ATTR_NO_DATA() UVERBS_ATTR_SIZE(0, 0) 454 455 /* 456 * Specifies a uapi structure that cannot be extended. The user must always 457 * supply the whole structure and nothing more. The structure must be declared 458 * in a header under include/uapi/rdma. 459 */ 460 #define UVERBS_ATTR_TYPE(_type) \ 461 .u.ptr.min_len = sizeof(_type), .u.ptr.len = sizeof(_type) 462 /* 463 * Specifies a uapi structure where the user must provide at least up to 464 * member 'last'. Anything after last and up until the end of the structure 465 * can be non-zero, anything longer than the end of the structure must be 466 * zero. The structure must be declared in a header under include/uapi/rdma. 467 */ 468 #define UVERBS_ATTR_STRUCT(_type, _last) \ 469 .zero_trailing = 1, \ 470 UVERBS_ATTR_SIZE(offsetofend(_type, _last), sizeof(_type)) 471 /* 472 * Specifies at least min_len bytes must be passed in, but the amount can be 473 * larger, up to the protocol maximum size. No check for zeroing is done. 474 */ 475 #define UVERBS_ATTR_MIN_SIZE(_min_len) UVERBS_ATTR_SIZE(_min_len, USHRT_MAX) 476 477 /* Must be used in the '...' of any UVERBS_ATTR */ 478 #define UA_ALLOC_AND_COPY .alloc_and_copy = 1 479 #define UA_MANDATORY .mandatory = 1 480 #define UA_OPTIONAL .mandatory = 0 481 482 /* 483 * min_len must be bigger than 0 and _max_len must be smaller than 4095. Only 484 * READ\WRITE accesses are supported. 485 */ 486 #define UVERBS_ATTR_IDRS_ARR(_attr_id, _idr_type, _access, _min_len, _max_len, \ 487 ...) \ 488 (&(const struct uverbs_attr_def){ \ 489 .id = (_attr_id) + \ 490 BUILD_BUG_ON_ZERO((_min_len) == 0 || \ 491 (_max_len) > \ 492 PAGE_SIZE / sizeof(void *) || \ 493 (_min_len) > (_max_len) || \ 494 (_access) == UVERBS_ACCESS_NEW || \ 495 (_access) == UVERBS_ACCESS_DESTROY), \ 496 .attr = { .type = UVERBS_ATTR_TYPE_IDRS_ARRAY, \ 497 .u2.objs_arr.obj_type = _idr_type, \ 498 .u2.objs_arr.access = _access, \ 499 .u2.objs_arr.min_len = _min_len, \ 500 .u2.objs_arr.max_len = _max_len, \ 501 __VA_ARGS__ } }) 502 503 /* 504 * Only for use with UVERBS_ATTR_IDR, allows any uobject type to be accepted, 505 * the user must validate the type of the uobject instead. 506 */ 507 #define UVERBS_IDR_ANY_OBJECT 0xFFFF 508 509 #define UVERBS_ATTR_IDR(_attr_id, _idr_type, _access, ...) \ 510 (&(const struct uverbs_attr_def){ \ 511 .id = _attr_id, \ 512 .attr = { .type = UVERBS_ATTR_TYPE_IDR, \ 513 .u.obj.obj_type = _idr_type, \ 514 .u.obj.access = _access, \ 515 __VA_ARGS__ } }) 516 517 #define UVERBS_ATTR_FD(_attr_id, _fd_type, _access, ...) \ 518 (&(const struct uverbs_attr_def){ \ 519 .id = (_attr_id) + \ 520 BUILD_BUG_ON_ZERO((_access) != UVERBS_ACCESS_NEW && \ 521 (_access) != UVERBS_ACCESS_READ), \ 522 .attr = { .type = UVERBS_ATTR_TYPE_FD, \ 523 .u.obj.obj_type = _fd_type, \ 524 .u.obj.access = _access, \ 525 __VA_ARGS__ } }) 526 527 #define UVERBS_ATTR_RAW_FD(_attr_id, ...) \ 528 (&(const struct uverbs_attr_def){ \ 529 .id = (_attr_id), \ 530 .attr = { .type = UVERBS_ATTR_TYPE_RAW_FD, __VA_ARGS__ } }) 531 532 #define UVERBS_ATTR_PTR_IN(_attr_id, _type, ...) \ 533 (&(const struct uverbs_attr_def){ \ 534 .id = _attr_id, \ 535 .attr = { .type = UVERBS_ATTR_TYPE_PTR_IN, \ 536 _type, \ 537 __VA_ARGS__ } }) 538 539 #define UVERBS_ATTR_PTR_OUT(_attr_id, _type, ...) \ 540 (&(const struct uverbs_attr_def){ \ 541 .id = _attr_id, \ 542 .attr = { .type = UVERBS_ATTR_TYPE_PTR_OUT, \ 543 _type, \ 544 __VA_ARGS__ } }) 545 546 /* _enum_arry should be a 'static const union uverbs_attr_spec[]' */ 547 #define UVERBS_ATTR_ENUM_IN(_attr_id, _enum_arr, ...) \ 548 (&(const struct uverbs_attr_def){ \ 549 .id = _attr_id, \ 550 .attr = { .type = UVERBS_ATTR_TYPE_ENUM_IN, \ 551 .u2.enum_def.ids = _enum_arr, \ 552 .u.enum_def.num_elems = ARRAY_SIZE(_enum_arr), \ 553 __VA_ARGS__ }, \ 554 }) 555 556 /* An input value that is a member in the enum _enum_type. */ 557 #define UVERBS_ATTR_CONST_IN(_attr_id, _enum_type, ...) \ 558 UVERBS_ATTR_PTR_IN( \ 559 _attr_id, \ 560 UVERBS_ATTR_SIZE( \ 561 sizeof(u64) + BUILD_BUG_ON_ZERO(!sizeof(_enum_type)), \ 562 sizeof(u64)), \ 563 __VA_ARGS__) 564 565 /* 566 * An input value that is a bitwise combination of values of _enum_type. 567 * This permits the flag value to be passed as either a u32 or u64, it must 568 * be retrieved via uverbs_get_flag(). 569 */ 570 #define UVERBS_ATTR_FLAGS_IN(_attr_id, _enum_type, ...) \ 571 UVERBS_ATTR_PTR_IN( \ 572 _attr_id, \ 573 UVERBS_ATTR_SIZE(sizeof(u32) + BUILD_BUG_ON_ZERO( \ 574 !sizeof(_enum_type *)), \ 575 sizeof(u64)), \ 576 __VA_ARGS__) 577 578 /* 579 * This spec is used in order to pass information to the hardware driver in a 580 * legacy way. Every verb that could get driver specific data should get this 581 * spec. 582 */ 583 #define UVERBS_ATTR_UHW() \ 584 UVERBS_ATTR_PTR_IN(UVERBS_ATTR_UHW_IN, \ 585 UVERBS_ATTR_MIN_SIZE(0), \ 586 UA_OPTIONAL, \ 587 .is_udata = 1), \ 588 UVERBS_ATTR_PTR_OUT(UVERBS_ATTR_UHW_OUT, \ 589 UVERBS_ATTR_MIN_SIZE(0), \ 590 UA_OPTIONAL, \ 591 .is_udata = 1) 592 593 /* ================================================= 594 * Parsing infrastructure 595 * ================================================= 596 */ 597 598 599 struct uverbs_ptr_attr { 600 /* 601 * If UVERBS_ATTR_SPEC_F_ALLOC_AND_COPY is set then the 'ptr' is 602 * used. 603 */ 604 union { 605 void *ptr; 606 u64 data; 607 }; 608 u16 len; 609 u16 uattr_idx; 610 u8 enum_id; 611 }; 612 613 struct uverbs_obj_attr { 614 struct ib_uobject *uobject; 615 const struct uverbs_api_attr *attr_elm; 616 }; 617 618 struct uverbs_objs_arr_attr { 619 struct ib_uobject **uobjects; 620 u16 len; 621 }; 622 623 struct uverbs_attr { 624 union { 625 struct uverbs_ptr_attr ptr_attr; 626 struct uverbs_obj_attr obj_attr; 627 struct uverbs_objs_arr_attr objs_arr_attr; 628 }; 629 }; 630 631 struct uverbs_attr_bundle { 632 struct_group_tagged(uverbs_attr_bundle_hdr, hdr, 633 struct ib_udata driver_udata; 634 struct ib_udata ucore; 635 struct ib_uverbs_file *ufile; 636 struct ib_ucontext *context; 637 struct ib_uobject *uobject; 638 DECLARE_BITMAP(attr_present, UVERBS_API_ATTR_BKEY_LEN); 639 ); 640 struct uverbs_attr attrs[]; 641 }; 642 643 static inline bool uverbs_attr_is_valid(const struct uverbs_attr_bundle *attrs_bundle, 644 unsigned int idx) 645 { 646 return test_bit(uapi_bkey_attr(uapi_key_attr(idx)), 647 attrs_bundle->attr_present); 648 } 649 650 /** 651 * rdma_udata_to_drv_context - Helper macro to get the driver's context out of 652 * ib_udata which is embedded in uverbs_attr_bundle. 653 * 654 * If udata is not NULL this cannot fail. Otherwise a NULL udata will result 655 * in a NULL ucontext pointer, as a safety precaution. Callers should be using 656 * 'udata' to determine if the driver call is in user or kernel mode, not 657 * 'ucontext'. 658 * 659 */ 660 static inline struct uverbs_attr_bundle * 661 rdma_udata_to_uverbs_attr_bundle(struct ib_udata *udata) 662 { 663 return container_of(udata, struct uverbs_attr_bundle, driver_udata); 664 } 665 666 #define rdma_udata_to_drv_context(udata, drv_dev_struct, member) \ 667 (udata ? container_of(rdma_udata_to_uverbs_attr_bundle(udata)->context, \ 668 drv_dev_struct, member) : (drv_dev_struct *)NULL) 669 670 #define IS_UVERBS_COPY_ERR(_ret) ((_ret) && (_ret) != -ENOENT) 671 672 static inline const struct uverbs_attr *uverbs_attr_get(const struct uverbs_attr_bundle *attrs_bundle, 673 u16 idx) 674 { 675 if (!uverbs_attr_is_valid(attrs_bundle, idx)) 676 return ERR_PTR(-ENOENT); 677 678 return &attrs_bundle->attrs[uapi_bkey_attr(uapi_key_attr(idx))]; 679 } 680 681 static inline int uverbs_attr_get_enum_id(const struct uverbs_attr_bundle *attrs_bundle, 682 u16 idx) 683 { 684 const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx); 685 686 if (IS_ERR(attr)) 687 return PTR_ERR(attr); 688 689 return attr->ptr_attr.enum_id; 690 } 691 692 static inline void *uverbs_attr_get_obj(const struct uverbs_attr_bundle *attrs_bundle, 693 u16 idx) 694 { 695 const struct uverbs_attr *attr; 696 697 attr = uverbs_attr_get(attrs_bundle, idx); 698 if (IS_ERR(attr)) 699 return ERR_CAST(attr); 700 701 return attr->obj_attr.uobject->object; 702 } 703 704 static inline struct ib_uobject *uverbs_attr_get_uobject(const struct uverbs_attr_bundle *attrs_bundle, 705 u16 idx) 706 { 707 const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx); 708 709 if (IS_ERR(attr)) 710 return ERR_CAST(attr); 711 712 return attr->obj_attr.uobject; 713 } 714 715 static inline int 716 uverbs_attr_get_len(const struct uverbs_attr_bundle *attrs_bundle, u16 idx) 717 { 718 const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx); 719 720 if (IS_ERR(attr)) 721 return PTR_ERR(attr); 722 723 return attr->ptr_attr.len; 724 } 725 726 void uverbs_finalize_uobj_create(const struct uverbs_attr_bundle *attrs_bundle, 727 u16 idx); 728 729 /* 730 * uverbs_attr_ptr_get_array_size() - Get array size pointer by a ptr 731 * attribute. 732 * @attrs: The attribute bundle 733 * @idx: The ID of the attribute 734 * @elem_size: The size of the element in the array 735 */ 736 static inline int 737 uverbs_attr_ptr_get_array_size(struct uverbs_attr_bundle *attrs, u16 idx, 738 size_t elem_size) 739 { 740 int size = uverbs_attr_get_len(attrs, idx); 741 742 if (size < 0) 743 return size; 744 745 if (size % elem_size) 746 return -EINVAL; 747 748 return size / elem_size; 749 } 750 751 /** 752 * uverbs_attr_get_uobjs_arr() - Provides array's properties for attribute for 753 * UVERBS_ATTR_TYPE_IDRS_ARRAY. 754 * @arr: Returned pointer to array of pointers for uobjects or NULL if 755 * the attribute isn't provided. 756 * 757 * Return: The array length or 0 if no attribute was provided. 758 */ 759 static inline int uverbs_attr_get_uobjs_arr( 760 const struct uverbs_attr_bundle *attrs_bundle, u16 attr_idx, 761 struct ib_uobject ***arr) 762 { 763 const struct uverbs_attr *attr = 764 uverbs_attr_get(attrs_bundle, attr_idx); 765 766 if (IS_ERR(attr)) { 767 *arr = NULL; 768 return 0; 769 } 770 771 *arr = attr->objs_arr_attr.uobjects; 772 773 return attr->objs_arr_attr.len; 774 } 775 776 static inline bool uverbs_attr_ptr_is_inline(const struct uverbs_attr *attr) 777 { 778 return attr->ptr_attr.len <= sizeof(attr->ptr_attr.data); 779 } 780 781 static inline void *uverbs_attr_get_alloced_ptr( 782 const struct uverbs_attr_bundle *attrs_bundle, u16 idx) 783 { 784 const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx); 785 786 if (IS_ERR(attr)) 787 return (void *)attr; 788 789 return uverbs_attr_ptr_is_inline(attr) ? (void *)&attr->ptr_attr.data : 790 attr->ptr_attr.ptr; 791 } 792 793 static inline int _uverbs_copy_from(void *to, 794 const struct uverbs_attr_bundle *attrs_bundle, 795 size_t idx, 796 size_t size) 797 { 798 const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx); 799 800 if (IS_ERR(attr)) 801 return PTR_ERR(attr); 802 803 /* 804 * Validation ensures attr->ptr_attr.len >= size. If the caller is 805 * using UVERBS_ATTR_SPEC_F_MIN_SZ_OR_ZERO then it must call 806 * uverbs_copy_from_or_zero. 807 */ 808 if (unlikely(size < attr->ptr_attr.len)) 809 return -EINVAL; 810 811 if (uverbs_attr_ptr_is_inline(attr)) 812 memcpy(to, &attr->ptr_attr.data, attr->ptr_attr.len); 813 else if (copy_from_user(to, u64_to_user_ptr(attr->ptr_attr.data), 814 attr->ptr_attr.len)) 815 return -EFAULT; 816 817 return 0; 818 } 819 820 static inline int _uverbs_copy_from_or_zero(void *to, 821 const struct uverbs_attr_bundle *attrs_bundle, 822 size_t idx, 823 size_t size) 824 { 825 const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx); 826 size_t min_size; 827 828 if (IS_ERR(attr)) 829 return PTR_ERR(attr); 830 831 min_size = min_t(size_t, size, attr->ptr_attr.len); 832 833 if (uverbs_attr_ptr_is_inline(attr)) 834 memcpy(to, &attr->ptr_attr.data, min_size); 835 else if (copy_from_user(to, u64_to_user_ptr(attr->ptr_attr.data), 836 min_size)) 837 return -EFAULT; 838 839 if (size > min_size) 840 memset(to + min_size, 0, size - min_size); 841 842 return 0; 843 } 844 845 #define uverbs_copy_from(to, attrs_bundle, idx) \ 846 _uverbs_copy_from(to, attrs_bundle, idx, sizeof(*to)) 847 848 #define uverbs_copy_from_or_zero(to, attrs_bundle, idx) \ 849 _uverbs_copy_from_or_zero(to, attrs_bundle, idx, sizeof(*to)) 850 851 static inline struct ib_ucontext * 852 ib_uverbs_get_ucontext(const struct uverbs_attr_bundle *attrs) 853 { 854 return ib_uverbs_get_ucontext_file(attrs->ufile); 855 } 856 857 #if IS_ENABLED(CONFIG_INFINIBAND_USER_ACCESS) 858 int uverbs_get_flags64(u64 *to, const struct uverbs_attr_bundle *attrs_bundle, 859 size_t idx, u64 allowed_bits); 860 int uverbs_get_flags32(u32 *to, const struct uverbs_attr_bundle *attrs_bundle, 861 size_t idx, u64 allowed_bits); 862 int uverbs_copy_to(const struct uverbs_attr_bundle *attrs_bundle, size_t idx, 863 const void *from, size_t size); 864 __malloc void *_uverbs_alloc(struct uverbs_attr_bundle *bundle, size_t size, 865 gfp_t flags); 866 867 static inline __malloc void *uverbs_alloc(struct uverbs_attr_bundle *bundle, 868 size_t size) 869 { 870 return _uverbs_alloc(bundle, size, GFP_KERNEL); 871 } 872 873 static inline __malloc void *uverbs_zalloc(struct uverbs_attr_bundle *bundle, 874 size_t size) 875 { 876 return _uverbs_alloc(bundle, size, GFP_KERNEL | __GFP_ZERO); 877 } 878 879 static inline __malloc void *uverbs_kcalloc(struct uverbs_attr_bundle *bundle, 880 size_t n, size_t size) 881 { 882 size_t bytes; 883 884 if (unlikely(check_mul_overflow(n, size, &bytes))) 885 return ERR_PTR(-EOVERFLOW); 886 return uverbs_zalloc(bundle, bytes); 887 } 888 889 int _uverbs_get_const_signed(s64 *to, 890 const struct uverbs_attr_bundle *attrs_bundle, 891 size_t idx, s64 lower_bound, u64 upper_bound, 892 s64 *def_val); 893 int _uverbs_get_const_unsigned(u64 *to, 894 const struct uverbs_attr_bundle *attrs_bundle, 895 size_t idx, u64 upper_bound, u64 *def_val); 896 int uverbs_copy_to_struct_or_zero(const struct uverbs_attr_bundle *bundle, 897 size_t idx, const void *from, size_t size); 898 #else 899 static inline int 900 uverbs_get_flags64(u64 *to, const struct uverbs_attr_bundle *attrs_bundle, 901 size_t idx, u64 allowed_bits) 902 { 903 return -EINVAL; 904 } 905 static inline int 906 uverbs_get_flags32(u32 *to, const struct uverbs_attr_bundle *attrs_bundle, 907 size_t idx, u64 allowed_bits) 908 { 909 return -EINVAL; 910 } 911 static inline int uverbs_copy_to(const struct uverbs_attr_bundle *attrs_bundle, 912 size_t idx, const void *from, size_t size) 913 { 914 return -EINVAL; 915 } 916 static inline __malloc void *uverbs_alloc(struct uverbs_attr_bundle *bundle, 917 size_t size) 918 { 919 return ERR_PTR(-EINVAL); 920 } 921 static inline __malloc void *uverbs_zalloc(struct uverbs_attr_bundle *bundle, 922 size_t size) 923 { 924 return ERR_PTR(-EINVAL); 925 } 926 static inline int 927 _uverbs_get_const(s64 *to, const struct uverbs_attr_bundle *attrs_bundle, 928 size_t idx, s64 lower_bound, u64 upper_bound, 929 s64 *def_val) 930 { 931 return -EINVAL; 932 } 933 static inline int 934 uverbs_copy_to_struct_or_zero(const struct uverbs_attr_bundle *bundle, 935 size_t idx, const void *from, size_t size) 936 { 937 return -EINVAL; 938 } 939 static inline int 940 _uverbs_get_const_signed(s64 *to, 941 const struct uverbs_attr_bundle *attrs_bundle, 942 size_t idx, s64 lower_bound, u64 upper_bound, 943 s64 *def_val) 944 { 945 return -EINVAL; 946 } 947 static inline int 948 _uverbs_get_const_unsigned(u64 *to, 949 const struct uverbs_attr_bundle *attrs_bundle, 950 size_t idx, u64 upper_bound, u64 *def_val) 951 { 952 return -EINVAL; 953 } 954 #endif 955 956 #define uverbs_get_const_signed(_to, _attrs_bundle, _idx) \ 957 ({ \ 958 s64 _val; \ 959 int _ret = \ 960 _uverbs_get_const_signed(&_val, _attrs_bundle, _idx, \ 961 type_min(typeof(*(_to))), \ 962 type_max(typeof(*(_to))), NULL); \ 963 (*(_to)) = _val; \ 964 _ret; \ 965 }) 966 967 #define uverbs_get_const_unsigned(_to, _attrs_bundle, _idx) \ 968 ({ \ 969 u64 _val; \ 970 int _ret = \ 971 _uverbs_get_const_unsigned(&_val, _attrs_bundle, _idx, \ 972 type_max(typeof(*(_to))), NULL); \ 973 (*(_to)) = _val; \ 974 _ret; \ 975 }) 976 977 #define uverbs_get_const_default_signed(_to, _attrs_bundle, _idx, _default) \ 978 ({ \ 979 s64 _val; \ 980 s64 _def_val = _default; \ 981 int _ret = \ 982 _uverbs_get_const_signed(&_val, _attrs_bundle, _idx, \ 983 type_min(typeof(*(_to))), \ 984 type_max(typeof(*(_to))), &_def_val); \ 985 (*(_to)) = _val; \ 986 _ret; \ 987 }) 988 989 #define uverbs_get_const_default_unsigned(_to, _attrs_bundle, _idx, _default) \ 990 ({ \ 991 u64 _val; \ 992 u64 _def_val = _default; \ 993 int _ret = \ 994 _uverbs_get_const_unsigned(&_val, _attrs_bundle, _idx, \ 995 type_max(typeof(*(_to))), &_def_val); \ 996 (*(_to)) = _val; \ 997 _ret; \ 998 }) 999 1000 #define uverbs_get_const(_to, _attrs_bundle, _idx) \ 1001 (is_signed_type(typeof(*(_to))) ? \ 1002 uverbs_get_const_signed(_to, _attrs_bundle, _idx) : \ 1003 uverbs_get_const_unsigned(_to, _attrs_bundle, _idx)) \ 1004 1005 #define uverbs_get_const_default(_to, _attrs_bundle, _idx, _default) \ 1006 (is_signed_type(typeof(*(_to))) ? \ 1007 uverbs_get_const_default_signed(_to, _attrs_bundle, _idx, \ 1008 _default) : \ 1009 uverbs_get_const_default_unsigned(_to, _attrs_bundle, _idx, \ 1010 _default)) 1011 1012 static inline int 1013 uverbs_get_raw_fd(int *to, const struct uverbs_attr_bundle *attrs_bundle, 1014 size_t idx) 1015 { 1016 return uverbs_get_const_signed(to, attrs_bundle, idx); 1017 } 1018 1019 #endif 1020