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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> | |
35410306 MB |
37 | #include <linux/uaccess.h> |
38 | #include <rdma/rdma_user_ioctl.h> | |
d70724f1 | 39 | #include <rdma/ib_user_ioctl_verbs.h> |
a0aa309c MB |
40 | |
41 | /* | |
42 | * ======================================= | |
43 | * Verbs action specifications | |
44 | * ======================================= | |
45 | */ | |
46 | ||
f43dbebf MB |
47 | enum uverbs_attr_type { |
48 | UVERBS_ATTR_TYPE_NA, | |
fac9658c MB |
49 | UVERBS_ATTR_TYPE_PTR_IN, |
50 | UVERBS_ATTR_TYPE_PTR_OUT, | |
f43dbebf MB |
51 | UVERBS_ATTR_TYPE_IDR, |
52 | UVERBS_ATTR_TYPE_FD, | |
53 | }; | |
54 | ||
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55 | enum uverbs_obj_access { |
56 | UVERBS_ACCESS_READ, | |
57 | UVERBS_ACCESS_WRITE, | |
58 | UVERBS_ACCESS_NEW, | |
59 | UVERBS_ACCESS_DESTROY | |
60 | }; | |
61 | ||
fac9658c MB |
62 | enum { |
63 | UVERBS_ATTR_SPEC_F_MANDATORY = 1U << 0, | |
64 | /* Support extending attributes by length */ | |
65 | UVERBS_ATTR_SPEC_F_MIN_SZ = 1U << 1, | |
66 | }; | |
67 | ||
f43dbebf MB |
68 | struct uverbs_attr_spec { |
69 | enum uverbs_attr_type type; | |
fac9658c MB |
70 | union { |
71 | u16 len; | |
72 | struct { | |
73 | /* | |
74 | * higher bits mean the namespace and lower bits mean | |
75 | * the type id within the namespace. | |
76 | */ | |
77 | u16 obj_type; | |
78 | u8 access; | |
79 | } obj; | |
80 | }; | |
81 | /* Combination of bits from enum UVERBS_ATTR_SPEC_F_XXXX */ | |
82 | u8 flags; | |
f43dbebf MB |
83 | }; |
84 | ||
85 | struct uverbs_attr_spec_hash { | |
86 | size_t num_attrs; | |
fac9658c | 87 | unsigned long *mandatory_attrs_bitmask; |
f43dbebf MB |
88 | struct uverbs_attr_spec attrs[0]; |
89 | }; | |
90 | ||
fac9658c MB |
91 | struct uverbs_attr_bundle; |
92 | struct ib_uverbs_file; | |
93 | ||
94 | enum { | |
95 | /* | |
96 | * Action marked with this flag creates a context (or root for all | |
97 | * objects). | |
98 | */ | |
99 | UVERBS_ACTION_FLAG_CREATE_ROOT = 1U << 0, | |
100 | }; | |
101 | ||
102 | struct uverbs_method_spec { | |
103 | /* Combination of bits from enum UVERBS_ACTION_FLAG_XXXX */ | |
104 | u32 flags; | |
105 | size_t num_buckets; | |
106 | size_t num_child_attrs; | |
107 | int (*handler)(struct ib_device *ib_dev, struct ib_uverbs_file *ufile, | |
108 | struct uverbs_attr_bundle *ctx); | |
109 | struct uverbs_attr_spec_hash *attr_buckets[0]; | |
110 | }; | |
111 | ||
112 | struct uverbs_method_spec_hash { | |
113 | size_t num_methods; | |
114 | struct uverbs_method_spec *methods[0]; | |
115 | }; | |
116 | ||
117 | struct uverbs_object_spec { | |
118 | const struct uverbs_obj_type *type_attrs; | |
119 | size_t num_buckets; | |
120 | struct uverbs_method_spec_hash *method_buckets[0]; | |
121 | }; | |
122 | ||
123 | struct uverbs_object_spec_hash { | |
124 | size_t num_objects; | |
125 | struct uverbs_object_spec *objects[0]; | |
126 | }; | |
127 | ||
128 | struct uverbs_root_spec { | |
129 | size_t num_buckets; | |
130 | struct uverbs_object_spec_hash *object_buckets[0]; | |
131 | }; | |
132 | ||
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133 | /* |
134 | * ======================================= | |
135 | * Verbs definitions | |
136 | * ======================================= | |
137 | */ | |
138 | ||
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139 | struct uverbs_attr_def { |
140 | u16 id; | |
141 | struct uverbs_attr_spec attr; | |
142 | }; | |
143 | ||
144 | struct uverbs_method_def { | |
145 | u16 id; | |
146 | /* Combination of bits from enum UVERBS_ACTION_FLAG_XXXX */ | |
147 | u32 flags; | |
148 | size_t num_attrs; | |
149 | const struct uverbs_attr_def * const (*attrs)[]; | |
150 | int (*handler)(struct ib_device *ib_dev, struct ib_uverbs_file *ufile, | |
151 | struct uverbs_attr_bundle *ctx); | |
152 | }; | |
153 | ||
5009010f | 154 | struct uverbs_object_def { |
09e3ebf8 | 155 | u16 id; |
5009010f | 156 | const struct uverbs_obj_type *type_attrs; |
09e3ebf8 MB |
157 | size_t num_methods; |
158 | const struct uverbs_method_def * const (*methods)[]; | |
159 | }; | |
160 | ||
161 | struct uverbs_object_tree_def { | |
162 | size_t num_objects; | |
163 | const struct uverbs_object_def * const (*objects)[]; | |
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164 | }; |
165 | ||
35410306 MB |
166 | #define UA_FLAGS(_flags) .flags = _flags |
167 | #define __UVERBS_ATTR0(_id, _len, _type, ...) \ | |
168 | ((const struct uverbs_attr_def) \ | |
169 | {.id = _id, .attr = {.type = _type, {.len = _len}, .flags = 0, } }) | |
170 | #define __UVERBS_ATTR1(_id, _len, _type, _flags) \ | |
171 | ((const struct uverbs_attr_def) \ | |
172 | {.id = _id, .attr = {.type = _type, {.len = _len}, _flags, } }) | |
173 | #define __UVERBS_ATTR(_id, _len, _type, _flags, _n, ...) \ | |
174 | __UVERBS_ATTR##_n(_id, _len, _type, _flags) | |
175 | /* | |
176 | * In new compiler, UVERBS_ATTR could be simplified by declaring it as | |
177 | * [_id] = {.type = _type, .len = _len, ##__VA_ARGS__} | |
178 | * But since we support older compilers too, we need the more complex code. | |
179 | */ | |
180 | #define UVERBS_ATTR(_id, _len, _type, ...) \ | |
181 | __UVERBS_ATTR(_id, _len, _type, ##__VA_ARGS__, 1, 0) | |
182 | #define UVERBS_ATTR_PTR_IN_SZ(_id, _len, ...) \ | |
183 | UVERBS_ATTR(_id, _len, UVERBS_ATTR_TYPE_PTR_IN, ##__VA_ARGS__) | |
184 | /* If sizeof(_type) <= sizeof(u64), this will be inlined rather than a pointer */ | |
185 | #define UVERBS_ATTR_PTR_IN(_id, _type, ...) \ | |
186 | UVERBS_ATTR_PTR_IN_SZ(_id, sizeof(_type), ##__VA_ARGS__) | |
187 | #define UVERBS_ATTR_PTR_OUT_SZ(_id, _len, ...) \ | |
188 | UVERBS_ATTR(_id, _len, UVERBS_ATTR_TYPE_PTR_OUT, ##__VA_ARGS__) | |
189 | #define UVERBS_ATTR_PTR_OUT(_id, _type, ...) \ | |
190 | UVERBS_ATTR_PTR_OUT_SZ(_id, sizeof(_type), ##__VA_ARGS__) | |
191 | ||
192 | /* | |
193 | * In new compiler, UVERBS_ATTR_IDR (and FD) could be simplified by declaring | |
194 | * it as | |
195 | * {.id = _id, \ | |
196 | * .attr {.type = __obj_class, \ | |
197 | * .obj = {.obj_type = _idr_type, \ | |
198 | * .access = _access \ | |
199 | * }, ##__VA_ARGS__ } } | |
200 | * But since we support older compilers too, we need the more complex code. | |
201 | */ | |
202 | #define ___UVERBS_ATTR_OBJ0(_id, _obj_class, _obj_type, _access, ...)\ | |
203 | ((const struct uverbs_attr_def) \ | |
204 | {.id = _id, \ | |
205 | .attr = {.type = _obj_class, \ | |
206 | {.obj = {.obj_type = _obj_type, .access = _access } },\ | |
207 | .flags = 0} }) | |
208 | #define ___UVERBS_ATTR_OBJ1(_id, _obj_class, _obj_type, _access, _flags)\ | |
209 | ((const struct uverbs_attr_def) \ | |
210 | {.id = _id, \ | |
211 | .attr = {.type = _obj_class, \ | |
212 | {.obj = {.obj_type = _obj_type, .access = _access} }, \ | |
213 | _flags} }) | |
214 | #define ___UVERBS_ATTR_OBJ(_id, _obj_class, _obj_type, _access, _flags, \ | |
215 | _n, ...) \ | |
216 | ___UVERBS_ATTR_OBJ##_n(_id, _obj_class, _obj_type, _access, _flags) | |
217 | #define __UVERBS_ATTR_OBJ(_id, _obj_class, _obj_type, _access, ...) \ | |
218 | ___UVERBS_ATTR_OBJ(_id, _obj_class, _obj_type, _access, \ | |
219 | ##__VA_ARGS__, 1, 0) | |
220 | #define UVERBS_ATTR_IDR(_id, _idr_type, _access, ...) \ | |
221 | __UVERBS_ATTR_OBJ(_id, UVERBS_ATTR_TYPE_IDR, _idr_type, _access,\ | |
222 | ##__VA_ARGS__) | |
223 | #define UVERBS_ATTR_FD(_id, _fd_type, _access, ...) \ | |
224 | __UVERBS_ATTR_OBJ(_id, UVERBS_ATTR_TYPE_FD, _fd_type, \ | |
225 | (_access) + BUILD_BUG_ON_ZERO( \ | |
226 | (_access) != UVERBS_ACCESS_NEW && \ | |
227 | (_access) != UVERBS_ACCESS_READ), \ | |
228 | ##__VA_ARGS__) | |
229 | #define DECLARE_UVERBS_ATTR_SPEC(_name, ...) \ | |
230 | const struct uverbs_attr_def _name = __VA_ARGS__ | |
231 | ||
232 | #define _UVERBS_METHOD_ATTRS_SZ(...) \ | |
233 | (sizeof((const struct uverbs_attr_def * const []){__VA_ARGS__}) /\ | |
234 | sizeof(const struct uverbs_attr_def *)) | |
235 | #define _UVERBS_METHOD(_id, _handler, _flags, ...) \ | |
236 | ((const struct uverbs_method_def) { \ | |
237 | .id = _id, \ | |
238 | .flags = _flags, \ | |
239 | .handler = _handler, \ | |
240 | .num_attrs = _UVERBS_METHOD_ATTRS_SZ(__VA_ARGS__), \ | |
241 | .attrs = &(const struct uverbs_attr_def * const []){__VA_ARGS__} }) | |
242 | #define DECLARE_UVERBS_METHOD(_name, _id, _handler, ...) \ | |
243 | const struct uverbs_method_def _name = \ | |
244 | _UVERBS_METHOD(_id, _handler, 0, ##__VA_ARGS__) | |
245 | #define DECLARE_UVERBS_CTX_METHOD(_name, _id, _handler, _flags, ...) \ | |
246 | const struct uverbs_method_def _name = \ | |
247 | _UVERBS_METHOD(_id, _handler, \ | |
248 | UVERBS_ACTION_FLAG_CREATE_ROOT, \ | |
249 | ##__VA_ARGS__) | |
250 | #define _UVERBS_OBJECT_METHODS_SZ(...) \ | |
251 | (sizeof((const struct uverbs_method_def * const []){__VA_ARGS__}) / \ | |
252 | sizeof(const struct uverbs_method_def *)) | |
5009010f MB |
253 | #define _UVERBS_OBJECT(_id, _type_attrs, ...) \ |
254 | ((const struct uverbs_object_def) { \ | |
09e3ebf8 | 255 | .id = _id, \ |
35410306 MB |
256 | .type_attrs = _type_attrs, \ |
257 | .num_methods = _UVERBS_OBJECT_METHODS_SZ(__VA_ARGS__), \ | |
258 | .methods = &(const struct uverbs_method_def * const []){__VA_ARGS__} }) | |
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259 | #define DECLARE_UVERBS_OBJECT(_name, _id, _type_attrs, ...) \ |
260 | const struct uverbs_object_def _name = \ | |
261 | _UVERBS_OBJECT(_id, _type_attrs, ##__VA_ARGS__) | |
09e3ebf8 MB |
262 | #define _UVERBS_TREE_OBJECTS_SZ(...) \ |
263 | (sizeof((const struct uverbs_object_def * const []){__VA_ARGS__}) / \ | |
264 | sizeof(const struct uverbs_object_def *)) | |
265 | #define _UVERBS_OBJECT_TREE(...) \ | |
266 | ((const struct uverbs_object_tree_def) { \ | |
267 | .num_objects = _UVERBS_TREE_OBJECTS_SZ(__VA_ARGS__), \ | |
268 | .objects = &(const struct uverbs_object_def * const []){__VA_ARGS__} }) | |
269 | #define DECLARE_UVERBS_OBJECT_TREE(_name, ...) \ | |
270 | const struct uverbs_object_tree_def _name = \ | |
271 | _UVERBS_OBJECT_TREE(__VA_ARGS__) | |
272 | ||
fac9658c MB |
273 | /* ================================================= |
274 | * Parsing infrastructure | |
275 | * ================================================= | |
276 | */ | |
277 | ||
278 | struct uverbs_ptr_attr { | |
279 | union { | |
280 | u64 data; | |
281 | void __user *ptr; | |
282 | }; | |
283 | u16 len; | |
284 | /* Combination of bits from enum UVERBS_ATTR_F_XXXX */ | |
285 | u16 flags; | |
286 | }; | |
287 | ||
f43dbebf | 288 | struct uverbs_obj_attr { |
fac9658c MB |
289 | /* pointer to the kernel descriptor -> type, access, etc */ |
290 | const struct uverbs_obj_type *type; | |
f43dbebf | 291 | struct ib_uobject *uobject; |
fac9658c MB |
292 | /* fd or id in idr of this object */ |
293 | int id; | |
f43dbebf MB |
294 | }; |
295 | ||
296 | struct uverbs_attr { | |
fac9658c MB |
297 | /* |
298 | * pointer to the user-space given attribute, in order to write the | |
299 | * new uobject's id or update flags. | |
300 | */ | |
301 | struct ib_uverbs_attr __user *uattr; | |
302 | union { | |
303 | struct uverbs_ptr_attr ptr_attr; | |
304 | struct uverbs_obj_attr obj_attr; | |
305 | }; | |
f43dbebf MB |
306 | }; |
307 | ||
308 | struct uverbs_attr_bundle_hash { | |
309 | /* if bit i is set, it means attrs[i] contains valid information */ | |
310 | unsigned long *valid_bitmap; | |
311 | size_t num_attrs; | |
312 | /* | |
313 | * arrays of attributes, each element corresponds to the specification | |
314 | * of the attribute in the same index. | |
315 | */ | |
316 | struct uverbs_attr *attrs; | |
317 | }; | |
318 | ||
319 | struct uverbs_attr_bundle { | |
320 | size_t num_buckets; | |
321 | struct uverbs_attr_bundle_hash hash[]; | |
322 | }; | |
323 | ||
324 | static inline bool uverbs_attr_is_valid_in_hash(const struct uverbs_attr_bundle_hash *attrs_hash, | |
325 | unsigned int idx) | |
326 | { | |
327 | return test_bit(idx, attrs_hash->valid_bitmap); | |
328 | } | |
329 | ||
35410306 MB |
330 | static inline bool uverbs_attr_is_valid(const struct uverbs_attr_bundle *attrs_bundle, |
331 | unsigned int idx) | |
332 | { | |
333 | u16 idx_bucket = idx >> UVERBS_ID_NS_SHIFT; | |
334 | ||
335 | if (attrs_bundle->num_buckets <= idx_bucket) | |
336 | return false; | |
337 | ||
338 | return uverbs_attr_is_valid_in_hash(&attrs_bundle->hash[idx_bucket], | |
339 | idx & ~UVERBS_ID_NS_MASK); | |
340 | } | |
341 | ||
d70724f1 MB |
342 | static inline const struct uverbs_attr *uverbs_attr_get(const struct uverbs_attr_bundle *attrs_bundle, |
343 | u16 idx) | |
344 | { | |
345 | u16 idx_bucket = idx >> UVERBS_ID_NS_SHIFT; | |
346 | ||
347 | if (!uverbs_attr_is_valid(attrs_bundle, idx)) | |
348 | return ERR_PTR(-ENOENT); | |
349 | ||
350 | return &attrs_bundle->hash[idx_bucket].attrs[idx & ~UVERBS_ID_NS_MASK]; | |
351 | } | |
352 | ||
353 | static inline int uverbs_copy_to(const struct uverbs_attr_bundle *attrs_bundle, | |
354 | size_t idx, const void *from) | |
355 | { | |
356 | const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx); | |
357 | u16 flags; | |
358 | ||
359 | if (IS_ERR(attr)) | |
360 | return PTR_ERR(attr); | |
361 | ||
362 | flags = attr->ptr_attr.flags | UVERBS_ATTR_F_VALID_OUTPUT; | |
363 | return (!copy_to_user(attr->ptr_attr.ptr, from, attr->ptr_attr.len) && | |
364 | !put_user(flags, &attr->uattr->flags)) ? 0 : -EFAULT; | |
365 | } | |
366 | ||
367 | static inline int _uverbs_copy_from(void *to, size_t to_size, | |
368 | const struct uverbs_attr_bundle *attrs_bundle, | |
369 | size_t idx) | |
370 | { | |
371 | const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx); | |
372 | ||
373 | if (IS_ERR(attr)) | |
374 | return PTR_ERR(attr); | |
375 | ||
376 | if (to_size <= sizeof(((struct ib_uverbs_attr *)0)->data)) | |
377 | memcpy(to, &attr->ptr_attr.data, attr->ptr_attr.len); | |
378 | else if (copy_from_user(to, attr->ptr_attr.ptr, attr->ptr_attr.len)) | |
379 | return -EFAULT; | |
380 | ||
381 | return 0; | |
382 | } | |
383 | ||
384 | #define uverbs_copy_from(to, attrs_bundle, idx) \ | |
385 | _uverbs_copy_from(to, sizeof(*(to)), attrs_bundle, idx) | |
386 | ||
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387 | /* ================================================= |
388 | * Definitions -> Specs infrastructure | |
389 | * ================================================= | |
390 | */ | |
391 | ||
392 | /* | |
393 | * uverbs_alloc_spec_tree - Merges different common and driver specific feature | |
394 | * into one parsing tree that every uverbs command will be parsed upon. | |
395 | * | |
396 | * @num_trees: Number of trees in the array @trees. | |
397 | * @trees: Array of pointers to tree root definitions to merge. Each such tree | |
398 | * possibly contains objects, methods and attributes definitions. | |
399 | * | |
400 | * Returns: | |
401 | * uverbs_root_spec *: The root of the merged parsing tree. | |
402 | * On error, we return an error code. Error is checked via IS_ERR. | |
403 | * | |
404 | * The following merges could take place: | |
405 | * a. Two trees representing the same method with different handler | |
406 | * -> We take the handler of the tree that its handler != NULL | |
407 | * and its index in the trees array is greater. The incentive for that | |
408 | * is that developers are expected to first merge common trees and then | |
409 | * merge trees that gives specialized the behaviour. | |
410 | * b. Two trees representing the same object with different | |
411 | * type_attrs (struct uverbs_obj_type): | |
412 | * -> We take the type_attrs of the tree that its type_attr != NULL | |
413 | * and its index in the trees array is greater. This could be used | |
414 | * in order to override the free function, allocation size, etc. | |
415 | * c. Two trees representing the same method attribute (same id but possibly | |
416 | * different attributes): | |
417 | * -> ERROR (-ENOENT), we believe that's not the programmer's intent. | |
418 | * | |
419 | * An object without any methods is considered invalid and will abort the | |
420 | * function with -ENOENT error. | |
421 | */ | |
52427112 | 422 | #if IS_ENABLED(CONFIG_INFINIBAND_USER_ACCESS) |
118620d3 MB |
423 | struct uverbs_root_spec *uverbs_alloc_spec_tree(unsigned int num_trees, |
424 | const struct uverbs_object_tree_def **trees); | |
425 | void uverbs_free_spec_tree(struct uverbs_root_spec *root); | |
52427112 MB |
426 | #else |
427 | static inline struct uverbs_root_spec *uverbs_alloc_spec_tree(unsigned int num_trees, | |
428 | const struct uverbs_object_tree_def **trees) | |
429 | { | |
430 | return NULL; | |
431 | } | |
432 | ||
433 | static inline void uverbs_free_spec_tree(struct uverbs_root_spec *root) | |
434 | { | |
435 | } | |
436 | #endif | |
a0aa309c | 437 | |
118620d3 | 438 | #endif |