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
uapi_key_obj(u32 id)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
uapi_key_is_object(u32 key)174 static inline __attribute_const__ bool uapi_key_is_object(u32 key)
175 {
176 return (key & ~UVERBS_API_OBJ_KEY_MASK) == 0;
177 }
178
uapi_key_ioctl_method(u32 id)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
uapi_key_write_method(u32 id)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
uapi_key_write_ex_method(u32 id)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
uapi_key_attr_to_ioctl_method(u32 attr_key)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
uapi_key_is_ioctl_method(u32 key)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
uapi_key_is_write_method(u32 key)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
uapi_key_is_write_ex_method(u32 key)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
uapi_key_attrs_start(u32 ioctl_method_key)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
uapi_key_attr(u32 id)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 */
uapi_key_is_attr(u32 key)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 */
uapi_bkey_attr(u32 attr_key)279 static inline __attribute_const__ u32 uapi_bkey_attr(u32 attr_key)
280 {
281 return attr_key - 1;
282 }
283
uapi_bkey_to_key_attr(u32 attr_bkey)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
uverbs_attr_is_valid(const struct uverbs_attr_bundle * attrs_bundle,unsigned int idx)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 *
rdma_udata_to_uverbs_attr_bundle(struct ib_udata * udata)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
uverbs_attr_get(const struct uverbs_attr_bundle * attrs_bundle,u16 idx)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
uverbs_attr_get_enum_id(const struct uverbs_attr_bundle * attrs_bundle,u16 idx)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
uverbs_attr_get_obj(const struct uverbs_attr_bundle * attrs_bundle,u16 idx)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
uverbs_attr_get_uobject(const struct uverbs_attr_bundle * attrs_bundle,u16 idx)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
uverbs_attr_get_len(const struct uverbs_attr_bundle * attrs_bundle,u16 idx)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
uverbs_attr_ptr_get_array_size(struct uverbs_attr_bundle * attrs,u16 idx,size_t elem_size)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 */
uverbs_attr_get_uobjs_arr(const struct uverbs_attr_bundle * attrs_bundle,u16 attr_idx,struct ib_uobject *** arr)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
uverbs_attr_ptr_is_inline(const struct uverbs_attr * attr)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
uverbs_attr_get_alloced_ptr(const struct uverbs_attr_bundle * attrs_bundle,u16 idx)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
_uverbs_copy_from(void * to,const struct uverbs_attr_bundle * attrs_bundle,size_t idx,size_t size)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
_uverbs_copy_from_or_zero(void * to,const struct uverbs_attr_bundle * attrs_bundle,size_t idx,size_t size)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 *
ib_uverbs_get_ucontext(const struct uverbs_attr_bundle * attrs)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
uverbs_alloc(struct uverbs_attr_bundle * bundle,size_t size)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
uverbs_zalloc(struct uverbs_attr_bundle * bundle,size_t size)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
uverbs_kcalloc(struct uverbs_attr_bundle * bundle,size_t n,size_t size)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
uverbs_get_flags64(u64 * to,const struct uverbs_attr_bundle * attrs_bundle,size_t idx,u64 allowed_bits)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
uverbs_get_flags32(u32 * to,const struct uverbs_attr_bundle * attrs_bundle,size_t idx,u64 allowed_bits)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 }
uverbs_copy_to(const struct uverbs_attr_bundle * attrs_bundle,size_t idx,const void * from,size_t size)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 }
uverbs_alloc(struct uverbs_attr_bundle * bundle,size_t size)916 static inline __malloc void *uverbs_alloc(struct uverbs_attr_bundle *bundle,
917 size_t size)
918 {
919 return ERR_PTR(-EINVAL);
920 }
uverbs_zalloc(struct uverbs_attr_bundle * bundle,size_t size)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
_uverbs_get_const(s64 * to,const struct uverbs_attr_bundle * attrs_bundle,size_t idx,s64 lower_bound,u64 upper_bound,s64 * def_val)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
uverbs_copy_to_struct_or_zero(const struct uverbs_attr_bundle * bundle,size_t idx,const void * from,size_t size)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
_uverbs_get_const_signed(s64 * to,const struct uverbs_attr_bundle * attrs_bundle,size_t idx,s64 lower_bound,u64 upper_bound,s64 * def_val)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
_uverbs_get_const_unsigned(u64 * to,const struct uverbs_attr_bundle * attrs_bundle,size_t idx,u64 upper_bound,u64 * def_val)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
uverbs_get_raw_fd(int * to,const struct uverbs_attr_bundle * attrs_bundle,size_t idx)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