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99c55f7d AS |
1 | /* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com |
2 | * | |
3 | * This program is free software; you can redistribute it and/or | |
4 | * modify it under the terms of version 2 of the GNU General Public | |
5 | * License as published by the Free Software Foundation. | |
6 | * | |
7 | * This program is distributed in the hope that it will be useful, but | |
8 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
10 | * General Public License for more details. | |
11 | */ | |
12 | #include <linux/bpf.h> | |
a67edbf4 | 13 | #include <linux/bpf_trace.h> |
99c55f7d AS |
14 | #include <linux/syscalls.h> |
15 | #include <linux/slab.h> | |
d407bd25 DB |
16 | #include <linux/vmalloc.h> |
17 | #include <linux/mmzone.h> | |
99c55f7d | 18 | #include <linux/anon_inodes.h> |
db20fd2b | 19 | #include <linux/file.h> |
09756af4 AS |
20 | #include <linux/license.h> |
21 | #include <linux/filter.h> | |
2541517c | 22 | #include <linux/version.h> |
535e7b4b | 23 | #include <linux/kernel.h> |
99c55f7d | 24 | |
b121d1e7 AS |
25 | DEFINE_PER_CPU(int, bpf_prog_active); |
26 | ||
1be7f75d AS |
27 | int sysctl_unprivileged_bpf_disabled __read_mostly; |
28 | ||
99c55f7d AS |
29 | static LIST_HEAD(bpf_map_types); |
30 | ||
31 | static struct bpf_map *find_and_alloc_map(union bpf_attr *attr) | |
32 | { | |
33 | struct bpf_map_type_list *tl; | |
34 | struct bpf_map *map; | |
35 | ||
36 | list_for_each_entry(tl, &bpf_map_types, list_node) { | |
37 | if (tl->type == attr->map_type) { | |
38 | map = tl->ops->map_alloc(attr); | |
39 | if (IS_ERR(map)) | |
40 | return map; | |
41 | map->ops = tl->ops; | |
42 | map->map_type = attr->map_type; | |
43 | return map; | |
44 | } | |
45 | } | |
46 | return ERR_PTR(-EINVAL); | |
47 | } | |
48 | ||
49 | /* boot time registration of different map implementations */ | |
50 | void bpf_register_map_type(struct bpf_map_type_list *tl) | |
51 | { | |
52 | list_add(&tl->list_node, &bpf_map_types); | |
53 | } | |
54 | ||
d407bd25 DB |
55 | void *bpf_map_area_alloc(size_t size) |
56 | { | |
57 | /* We definitely need __GFP_NORETRY, so OOM killer doesn't | |
58 | * trigger under memory pressure as we really just want to | |
59 | * fail instead. | |
60 | */ | |
61 | const gfp_t flags = __GFP_NOWARN | __GFP_NORETRY | __GFP_ZERO; | |
62 | void *area; | |
63 | ||
64 | if (size <= (PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER)) { | |
65 | area = kmalloc(size, GFP_USER | flags); | |
66 | if (area != NULL) | |
67 | return area; | |
68 | } | |
69 | ||
70 | return __vmalloc(size, GFP_KERNEL | __GFP_HIGHMEM | flags, | |
71 | PAGE_KERNEL); | |
72 | } | |
73 | ||
74 | void bpf_map_area_free(void *area) | |
75 | { | |
76 | kvfree(area); | |
77 | } | |
78 | ||
6c905981 AS |
79 | int bpf_map_precharge_memlock(u32 pages) |
80 | { | |
81 | struct user_struct *user = get_current_user(); | |
82 | unsigned long memlock_limit, cur; | |
83 | ||
84 | memlock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
85 | cur = atomic_long_read(&user->locked_vm); | |
86 | free_uid(user); | |
87 | if (cur + pages > memlock_limit) | |
88 | return -EPERM; | |
89 | return 0; | |
90 | } | |
91 | ||
aaac3ba9 AS |
92 | static int bpf_map_charge_memlock(struct bpf_map *map) |
93 | { | |
94 | struct user_struct *user = get_current_user(); | |
95 | unsigned long memlock_limit; | |
96 | ||
97 | memlock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
98 | ||
99 | atomic_long_add(map->pages, &user->locked_vm); | |
100 | ||
101 | if (atomic_long_read(&user->locked_vm) > memlock_limit) { | |
102 | atomic_long_sub(map->pages, &user->locked_vm); | |
103 | free_uid(user); | |
104 | return -EPERM; | |
105 | } | |
106 | map->user = user; | |
107 | return 0; | |
108 | } | |
109 | ||
110 | static void bpf_map_uncharge_memlock(struct bpf_map *map) | |
111 | { | |
112 | struct user_struct *user = map->user; | |
113 | ||
114 | atomic_long_sub(map->pages, &user->locked_vm); | |
115 | free_uid(user); | |
116 | } | |
117 | ||
99c55f7d AS |
118 | /* called from workqueue */ |
119 | static void bpf_map_free_deferred(struct work_struct *work) | |
120 | { | |
121 | struct bpf_map *map = container_of(work, struct bpf_map, work); | |
122 | ||
aaac3ba9 | 123 | bpf_map_uncharge_memlock(map); |
99c55f7d AS |
124 | /* implementation dependent freeing */ |
125 | map->ops->map_free(map); | |
126 | } | |
127 | ||
c9da161c DB |
128 | static void bpf_map_put_uref(struct bpf_map *map) |
129 | { | |
130 | if (atomic_dec_and_test(&map->usercnt)) { | |
131 | if (map->map_type == BPF_MAP_TYPE_PROG_ARRAY) | |
132 | bpf_fd_array_map_clear(map); | |
133 | } | |
134 | } | |
135 | ||
99c55f7d AS |
136 | /* decrement map refcnt and schedule it for freeing via workqueue |
137 | * (unrelying map implementation ops->map_free() might sleep) | |
138 | */ | |
139 | void bpf_map_put(struct bpf_map *map) | |
140 | { | |
141 | if (atomic_dec_and_test(&map->refcnt)) { | |
142 | INIT_WORK(&map->work, bpf_map_free_deferred); | |
143 | schedule_work(&map->work); | |
144 | } | |
145 | } | |
146 | ||
c9da161c | 147 | void bpf_map_put_with_uref(struct bpf_map *map) |
99c55f7d | 148 | { |
c9da161c | 149 | bpf_map_put_uref(map); |
99c55f7d | 150 | bpf_map_put(map); |
c9da161c DB |
151 | } |
152 | ||
153 | static int bpf_map_release(struct inode *inode, struct file *filp) | |
154 | { | |
61d1b6a4 DB |
155 | struct bpf_map *map = filp->private_data; |
156 | ||
157 | if (map->ops->map_release) | |
158 | map->ops->map_release(map, filp); | |
159 | ||
160 | bpf_map_put_with_uref(map); | |
99c55f7d AS |
161 | return 0; |
162 | } | |
163 | ||
f99bf205 DB |
164 | #ifdef CONFIG_PROC_FS |
165 | static void bpf_map_show_fdinfo(struct seq_file *m, struct file *filp) | |
166 | { | |
167 | const struct bpf_map *map = filp->private_data; | |
21116b70 DB |
168 | const struct bpf_array *array; |
169 | u32 owner_prog_type = 0; | |
170 | ||
171 | if (map->map_type == BPF_MAP_TYPE_PROG_ARRAY) { | |
172 | array = container_of(map, struct bpf_array, map); | |
173 | owner_prog_type = array->owner_prog_type; | |
174 | } | |
f99bf205 DB |
175 | |
176 | seq_printf(m, | |
177 | "map_type:\t%u\n" | |
178 | "key_size:\t%u\n" | |
179 | "value_size:\t%u\n" | |
322cea2f | 180 | "max_entries:\t%u\n" |
21116b70 DB |
181 | "map_flags:\t%#x\n" |
182 | "memlock:\t%llu\n", | |
f99bf205 DB |
183 | map->map_type, |
184 | map->key_size, | |
185 | map->value_size, | |
322cea2f | 186 | map->max_entries, |
21116b70 DB |
187 | map->map_flags, |
188 | map->pages * 1ULL << PAGE_SHIFT); | |
189 | ||
190 | if (owner_prog_type) | |
191 | seq_printf(m, "owner_prog_type:\t%u\n", | |
192 | owner_prog_type); | |
f99bf205 DB |
193 | } |
194 | #endif | |
195 | ||
99c55f7d | 196 | static const struct file_operations bpf_map_fops = { |
f99bf205 DB |
197 | #ifdef CONFIG_PROC_FS |
198 | .show_fdinfo = bpf_map_show_fdinfo, | |
199 | #endif | |
200 | .release = bpf_map_release, | |
99c55f7d AS |
201 | }; |
202 | ||
b2197755 | 203 | int bpf_map_new_fd(struct bpf_map *map) |
aa79781b DB |
204 | { |
205 | return anon_inode_getfd("bpf-map", &bpf_map_fops, map, | |
206 | O_RDWR | O_CLOEXEC); | |
207 | } | |
208 | ||
99c55f7d AS |
209 | /* helper macro to check that unused fields 'union bpf_attr' are zero */ |
210 | #define CHECK_ATTR(CMD) \ | |
211 | memchr_inv((void *) &attr->CMD##_LAST_FIELD + \ | |
212 | sizeof(attr->CMD##_LAST_FIELD), 0, \ | |
213 | sizeof(*attr) - \ | |
214 | offsetof(union bpf_attr, CMD##_LAST_FIELD) - \ | |
215 | sizeof(attr->CMD##_LAST_FIELD)) != NULL | |
216 | ||
6c905981 | 217 | #define BPF_MAP_CREATE_LAST_FIELD map_flags |
99c55f7d AS |
218 | /* called via syscall */ |
219 | static int map_create(union bpf_attr *attr) | |
220 | { | |
221 | struct bpf_map *map; | |
222 | int err; | |
223 | ||
224 | err = CHECK_ATTR(BPF_MAP_CREATE); | |
225 | if (err) | |
226 | return -EINVAL; | |
227 | ||
228 | /* find map type and init map: hashtable vs rbtree vs bloom vs ... */ | |
229 | map = find_and_alloc_map(attr); | |
230 | if (IS_ERR(map)) | |
231 | return PTR_ERR(map); | |
232 | ||
233 | atomic_set(&map->refcnt, 1); | |
c9da161c | 234 | atomic_set(&map->usercnt, 1); |
99c55f7d | 235 | |
aaac3ba9 AS |
236 | err = bpf_map_charge_memlock(map); |
237 | if (err) | |
20b2b24f | 238 | goto free_map_nouncharge; |
aaac3ba9 | 239 | |
aa79781b | 240 | err = bpf_map_new_fd(map); |
99c55f7d AS |
241 | if (err < 0) |
242 | /* failed to allocate fd */ | |
243 | goto free_map; | |
244 | ||
a67edbf4 | 245 | trace_bpf_map_create(map, err); |
99c55f7d AS |
246 | return err; |
247 | ||
248 | free_map: | |
20b2b24f DB |
249 | bpf_map_uncharge_memlock(map); |
250 | free_map_nouncharge: | |
99c55f7d AS |
251 | map->ops->map_free(map); |
252 | return err; | |
253 | } | |
254 | ||
db20fd2b AS |
255 | /* if error is returned, fd is released. |
256 | * On success caller should complete fd access with matching fdput() | |
257 | */ | |
c2101297 | 258 | struct bpf_map *__bpf_map_get(struct fd f) |
db20fd2b | 259 | { |
db20fd2b AS |
260 | if (!f.file) |
261 | return ERR_PTR(-EBADF); | |
db20fd2b AS |
262 | if (f.file->f_op != &bpf_map_fops) { |
263 | fdput(f); | |
264 | return ERR_PTR(-EINVAL); | |
265 | } | |
266 | ||
c2101297 DB |
267 | return f.file->private_data; |
268 | } | |
269 | ||
92117d84 AS |
270 | /* prog's and map's refcnt limit */ |
271 | #define BPF_MAX_REFCNT 32768 | |
272 | ||
273 | struct bpf_map *bpf_map_inc(struct bpf_map *map, bool uref) | |
c9da161c | 274 | { |
92117d84 AS |
275 | if (atomic_inc_return(&map->refcnt) > BPF_MAX_REFCNT) { |
276 | atomic_dec(&map->refcnt); | |
277 | return ERR_PTR(-EBUSY); | |
278 | } | |
c9da161c DB |
279 | if (uref) |
280 | atomic_inc(&map->usercnt); | |
92117d84 | 281 | return map; |
c9da161c DB |
282 | } |
283 | ||
284 | struct bpf_map *bpf_map_get_with_uref(u32 ufd) | |
c2101297 DB |
285 | { |
286 | struct fd f = fdget(ufd); | |
287 | struct bpf_map *map; | |
288 | ||
289 | map = __bpf_map_get(f); | |
290 | if (IS_ERR(map)) | |
291 | return map; | |
292 | ||
92117d84 | 293 | map = bpf_map_inc(map, true); |
c2101297 | 294 | fdput(f); |
db20fd2b AS |
295 | |
296 | return map; | |
297 | } | |
298 | ||
b8cdc051 AS |
299 | int __weak bpf_stackmap_copy(struct bpf_map *map, void *key, void *value) |
300 | { | |
301 | return -ENOTSUPP; | |
302 | } | |
303 | ||
db20fd2b AS |
304 | /* last field in 'union bpf_attr' used by this command */ |
305 | #define BPF_MAP_LOOKUP_ELEM_LAST_FIELD value | |
306 | ||
307 | static int map_lookup_elem(union bpf_attr *attr) | |
308 | { | |
535e7b4b MS |
309 | void __user *ukey = u64_to_user_ptr(attr->key); |
310 | void __user *uvalue = u64_to_user_ptr(attr->value); | |
db20fd2b | 311 | int ufd = attr->map_fd; |
db20fd2b | 312 | struct bpf_map *map; |
8ebe667c | 313 | void *key, *value, *ptr; |
15a07b33 | 314 | u32 value_size; |
592867bf | 315 | struct fd f; |
db20fd2b AS |
316 | int err; |
317 | ||
318 | if (CHECK_ATTR(BPF_MAP_LOOKUP_ELEM)) | |
319 | return -EINVAL; | |
320 | ||
592867bf | 321 | f = fdget(ufd); |
c2101297 | 322 | map = __bpf_map_get(f); |
db20fd2b AS |
323 | if (IS_ERR(map)) |
324 | return PTR_ERR(map); | |
325 | ||
326 | err = -ENOMEM; | |
327 | key = kmalloc(map->key_size, GFP_USER); | |
328 | if (!key) | |
329 | goto err_put; | |
330 | ||
331 | err = -EFAULT; | |
332 | if (copy_from_user(key, ukey, map->key_size) != 0) | |
333 | goto free_key; | |
334 | ||
15a07b33 | 335 | if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH || |
8f844938 | 336 | map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH || |
15a07b33 AS |
337 | map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY) |
338 | value_size = round_up(map->value_size, 8) * num_possible_cpus(); | |
339 | else | |
340 | value_size = map->value_size; | |
341 | ||
8ebe667c | 342 | err = -ENOMEM; |
15a07b33 | 343 | value = kmalloc(value_size, GFP_USER | __GFP_NOWARN); |
db20fd2b | 344 | if (!value) |
8ebe667c AS |
345 | goto free_key; |
346 | ||
8f844938 MKL |
347 | if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH || |
348 | map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH) { | |
15a07b33 AS |
349 | err = bpf_percpu_hash_copy(map, key, value); |
350 | } else if (map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY) { | |
351 | err = bpf_percpu_array_copy(map, key, value); | |
557c0c6e AS |
352 | } else if (map->map_type == BPF_MAP_TYPE_STACK_TRACE) { |
353 | err = bpf_stackmap_copy(map, key, value); | |
15a07b33 AS |
354 | } else { |
355 | rcu_read_lock(); | |
356 | ptr = map->ops->map_lookup_elem(map, key); | |
357 | if (ptr) | |
358 | memcpy(value, ptr, value_size); | |
359 | rcu_read_unlock(); | |
360 | err = ptr ? 0 : -ENOENT; | |
361 | } | |
8ebe667c | 362 | |
15a07b33 | 363 | if (err) |
8ebe667c | 364 | goto free_value; |
db20fd2b AS |
365 | |
366 | err = -EFAULT; | |
15a07b33 | 367 | if (copy_to_user(uvalue, value, value_size) != 0) |
8ebe667c | 368 | goto free_value; |
db20fd2b | 369 | |
a67edbf4 | 370 | trace_bpf_map_lookup_elem(map, ufd, key, value); |
db20fd2b AS |
371 | err = 0; |
372 | ||
8ebe667c AS |
373 | free_value: |
374 | kfree(value); | |
db20fd2b AS |
375 | free_key: |
376 | kfree(key); | |
377 | err_put: | |
378 | fdput(f); | |
379 | return err; | |
380 | } | |
381 | ||
3274f520 | 382 | #define BPF_MAP_UPDATE_ELEM_LAST_FIELD flags |
db20fd2b AS |
383 | |
384 | static int map_update_elem(union bpf_attr *attr) | |
385 | { | |
535e7b4b MS |
386 | void __user *ukey = u64_to_user_ptr(attr->key); |
387 | void __user *uvalue = u64_to_user_ptr(attr->value); | |
db20fd2b | 388 | int ufd = attr->map_fd; |
db20fd2b AS |
389 | struct bpf_map *map; |
390 | void *key, *value; | |
15a07b33 | 391 | u32 value_size; |
592867bf | 392 | struct fd f; |
db20fd2b AS |
393 | int err; |
394 | ||
395 | if (CHECK_ATTR(BPF_MAP_UPDATE_ELEM)) | |
396 | return -EINVAL; | |
397 | ||
592867bf | 398 | f = fdget(ufd); |
c2101297 | 399 | map = __bpf_map_get(f); |
db20fd2b AS |
400 | if (IS_ERR(map)) |
401 | return PTR_ERR(map); | |
402 | ||
403 | err = -ENOMEM; | |
404 | key = kmalloc(map->key_size, GFP_USER); | |
405 | if (!key) | |
406 | goto err_put; | |
407 | ||
408 | err = -EFAULT; | |
409 | if (copy_from_user(key, ukey, map->key_size) != 0) | |
410 | goto free_key; | |
411 | ||
15a07b33 | 412 | if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH || |
8f844938 | 413 | map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH || |
15a07b33 AS |
414 | map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY) |
415 | value_size = round_up(map->value_size, 8) * num_possible_cpus(); | |
416 | else | |
417 | value_size = map->value_size; | |
418 | ||
db20fd2b | 419 | err = -ENOMEM; |
15a07b33 | 420 | value = kmalloc(value_size, GFP_USER | __GFP_NOWARN); |
db20fd2b AS |
421 | if (!value) |
422 | goto free_key; | |
423 | ||
424 | err = -EFAULT; | |
15a07b33 | 425 | if (copy_from_user(value, uvalue, value_size) != 0) |
db20fd2b AS |
426 | goto free_value; |
427 | ||
b121d1e7 AS |
428 | /* must increment bpf_prog_active to avoid kprobe+bpf triggering from |
429 | * inside bpf map update or delete otherwise deadlocks are possible | |
430 | */ | |
431 | preempt_disable(); | |
432 | __this_cpu_inc(bpf_prog_active); | |
8f844938 MKL |
433 | if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH || |
434 | map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH) { | |
15a07b33 AS |
435 | err = bpf_percpu_hash_update(map, key, value, attr->flags); |
436 | } else if (map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY) { | |
437 | err = bpf_percpu_array_update(map, key, value, attr->flags); | |
d056a788 | 438 | } else if (map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY || |
4ed8ec52 MKL |
439 | map->map_type == BPF_MAP_TYPE_PROG_ARRAY || |
440 | map->map_type == BPF_MAP_TYPE_CGROUP_ARRAY) { | |
d056a788 DB |
441 | rcu_read_lock(); |
442 | err = bpf_fd_array_map_update_elem(map, f.file, key, value, | |
443 | attr->flags); | |
444 | rcu_read_unlock(); | |
15a07b33 AS |
445 | } else { |
446 | rcu_read_lock(); | |
447 | err = map->ops->map_update_elem(map, key, value, attr->flags); | |
448 | rcu_read_unlock(); | |
449 | } | |
b121d1e7 AS |
450 | __this_cpu_dec(bpf_prog_active); |
451 | preempt_enable(); | |
db20fd2b | 452 | |
a67edbf4 DB |
453 | if (!err) |
454 | trace_bpf_map_update_elem(map, ufd, key, value); | |
db20fd2b AS |
455 | free_value: |
456 | kfree(value); | |
457 | free_key: | |
458 | kfree(key); | |
459 | err_put: | |
460 | fdput(f); | |
461 | return err; | |
462 | } | |
463 | ||
464 | #define BPF_MAP_DELETE_ELEM_LAST_FIELD key | |
465 | ||
466 | static int map_delete_elem(union bpf_attr *attr) | |
467 | { | |
535e7b4b | 468 | void __user *ukey = u64_to_user_ptr(attr->key); |
db20fd2b | 469 | int ufd = attr->map_fd; |
db20fd2b | 470 | struct bpf_map *map; |
592867bf | 471 | struct fd f; |
db20fd2b AS |
472 | void *key; |
473 | int err; | |
474 | ||
475 | if (CHECK_ATTR(BPF_MAP_DELETE_ELEM)) | |
476 | return -EINVAL; | |
477 | ||
592867bf | 478 | f = fdget(ufd); |
c2101297 | 479 | map = __bpf_map_get(f); |
db20fd2b AS |
480 | if (IS_ERR(map)) |
481 | return PTR_ERR(map); | |
482 | ||
483 | err = -ENOMEM; | |
484 | key = kmalloc(map->key_size, GFP_USER); | |
485 | if (!key) | |
486 | goto err_put; | |
487 | ||
488 | err = -EFAULT; | |
489 | if (copy_from_user(key, ukey, map->key_size) != 0) | |
490 | goto free_key; | |
491 | ||
b121d1e7 AS |
492 | preempt_disable(); |
493 | __this_cpu_inc(bpf_prog_active); | |
db20fd2b AS |
494 | rcu_read_lock(); |
495 | err = map->ops->map_delete_elem(map, key); | |
496 | rcu_read_unlock(); | |
b121d1e7 AS |
497 | __this_cpu_dec(bpf_prog_active); |
498 | preempt_enable(); | |
db20fd2b | 499 | |
a67edbf4 DB |
500 | if (!err) |
501 | trace_bpf_map_delete_elem(map, ufd, key); | |
db20fd2b AS |
502 | free_key: |
503 | kfree(key); | |
504 | err_put: | |
505 | fdput(f); | |
506 | return err; | |
507 | } | |
508 | ||
509 | /* last field in 'union bpf_attr' used by this command */ | |
510 | #define BPF_MAP_GET_NEXT_KEY_LAST_FIELD next_key | |
511 | ||
512 | static int map_get_next_key(union bpf_attr *attr) | |
513 | { | |
535e7b4b MS |
514 | void __user *ukey = u64_to_user_ptr(attr->key); |
515 | void __user *unext_key = u64_to_user_ptr(attr->next_key); | |
db20fd2b | 516 | int ufd = attr->map_fd; |
db20fd2b AS |
517 | struct bpf_map *map; |
518 | void *key, *next_key; | |
592867bf | 519 | struct fd f; |
db20fd2b AS |
520 | int err; |
521 | ||
522 | if (CHECK_ATTR(BPF_MAP_GET_NEXT_KEY)) | |
523 | return -EINVAL; | |
524 | ||
592867bf | 525 | f = fdget(ufd); |
c2101297 | 526 | map = __bpf_map_get(f); |
db20fd2b AS |
527 | if (IS_ERR(map)) |
528 | return PTR_ERR(map); | |
529 | ||
530 | err = -ENOMEM; | |
531 | key = kmalloc(map->key_size, GFP_USER); | |
532 | if (!key) | |
533 | goto err_put; | |
534 | ||
535 | err = -EFAULT; | |
536 | if (copy_from_user(key, ukey, map->key_size) != 0) | |
537 | goto free_key; | |
538 | ||
539 | err = -ENOMEM; | |
540 | next_key = kmalloc(map->key_size, GFP_USER); | |
541 | if (!next_key) | |
542 | goto free_key; | |
543 | ||
544 | rcu_read_lock(); | |
545 | err = map->ops->map_get_next_key(map, key, next_key); | |
546 | rcu_read_unlock(); | |
547 | if (err) | |
548 | goto free_next_key; | |
549 | ||
550 | err = -EFAULT; | |
551 | if (copy_to_user(unext_key, next_key, map->key_size) != 0) | |
552 | goto free_next_key; | |
553 | ||
a67edbf4 | 554 | trace_bpf_map_next_key(map, ufd, key, next_key); |
db20fd2b AS |
555 | err = 0; |
556 | ||
557 | free_next_key: | |
558 | kfree(next_key); | |
559 | free_key: | |
560 | kfree(key); | |
561 | err_put: | |
562 | fdput(f); | |
563 | return err; | |
564 | } | |
565 | ||
09756af4 AS |
566 | static LIST_HEAD(bpf_prog_types); |
567 | ||
568 | static int find_prog_type(enum bpf_prog_type type, struct bpf_prog *prog) | |
569 | { | |
570 | struct bpf_prog_type_list *tl; | |
571 | ||
572 | list_for_each_entry(tl, &bpf_prog_types, list_node) { | |
573 | if (tl->type == type) { | |
574 | prog->aux->ops = tl->ops; | |
24701ece | 575 | prog->type = type; |
09756af4 AS |
576 | return 0; |
577 | } | |
578 | } | |
24701ece | 579 | |
09756af4 AS |
580 | return -EINVAL; |
581 | } | |
582 | ||
583 | void bpf_register_prog_type(struct bpf_prog_type_list *tl) | |
584 | { | |
585 | list_add(&tl->list_node, &bpf_prog_types); | |
586 | } | |
587 | ||
0a542a86 AS |
588 | /* fixup insn->imm field of bpf_call instructions: |
589 | * if (insn->imm == BPF_FUNC_map_lookup_elem) | |
590 | * insn->imm = bpf_map_lookup_elem - __bpf_call_base; | |
591 | * else if (insn->imm == BPF_FUNC_map_update_elem) | |
592 | * insn->imm = bpf_map_update_elem - __bpf_call_base; | |
593 | * else ... | |
594 | * | |
595 | * this function is called after eBPF program passed verification | |
596 | */ | |
597 | static void fixup_bpf_calls(struct bpf_prog *prog) | |
598 | { | |
599 | const struct bpf_func_proto *fn; | |
600 | int i; | |
601 | ||
602 | for (i = 0; i < prog->len; i++) { | |
603 | struct bpf_insn *insn = &prog->insnsi[i]; | |
604 | ||
605 | if (insn->code == (BPF_JMP | BPF_CALL)) { | |
606 | /* we reach here when program has bpf_call instructions | |
607 | * and it passed bpf_check(), means that | |
608 | * ops->get_func_proto must have been supplied, check it | |
609 | */ | |
610 | BUG_ON(!prog->aux->ops->get_func_proto); | |
611 | ||
c46646d0 DB |
612 | if (insn->imm == BPF_FUNC_get_route_realm) |
613 | prog->dst_needed = 1; | |
3ad00405 DB |
614 | if (insn->imm == BPF_FUNC_get_prandom_u32) |
615 | bpf_user_rnd_init_once(); | |
17bedab2 MKL |
616 | if (insn->imm == BPF_FUNC_xdp_adjust_head) |
617 | prog->xdp_adjust_head = 1; | |
04fd61ab AS |
618 | if (insn->imm == BPF_FUNC_tail_call) { |
619 | /* mark bpf_tail_call as different opcode | |
620 | * to avoid conditional branch in | |
621 | * interpeter for every normal call | |
622 | * and to prevent accidental JITing by | |
623 | * JIT compiler that doesn't support | |
624 | * bpf_tail_call yet | |
625 | */ | |
626 | insn->imm = 0; | |
627 | insn->code |= BPF_X; | |
628 | continue; | |
629 | } | |
630 | ||
0a542a86 AS |
631 | fn = prog->aux->ops->get_func_proto(insn->imm); |
632 | /* all functions that have prototype and verifier allowed | |
633 | * programs to call them, must be real in-kernel functions | |
634 | */ | |
635 | BUG_ON(!fn->func); | |
636 | insn->imm = fn->func - __bpf_call_base; | |
637 | } | |
638 | } | |
639 | } | |
640 | ||
09756af4 AS |
641 | /* drop refcnt on maps used by eBPF program and free auxilary data */ |
642 | static void free_used_maps(struct bpf_prog_aux *aux) | |
643 | { | |
644 | int i; | |
645 | ||
646 | for (i = 0; i < aux->used_map_cnt; i++) | |
647 | bpf_map_put(aux->used_maps[i]); | |
648 | ||
649 | kfree(aux->used_maps); | |
650 | } | |
651 | ||
5ccb071e DB |
652 | int __bpf_prog_charge(struct user_struct *user, u32 pages) |
653 | { | |
654 | unsigned long memlock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
655 | unsigned long user_bufs; | |
656 | ||
657 | if (user) { | |
658 | user_bufs = atomic_long_add_return(pages, &user->locked_vm); | |
659 | if (user_bufs > memlock_limit) { | |
660 | atomic_long_sub(pages, &user->locked_vm); | |
661 | return -EPERM; | |
662 | } | |
663 | } | |
664 | ||
665 | return 0; | |
666 | } | |
667 | ||
668 | void __bpf_prog_uncharge(struct user_struct *user, u32 pages) | |
669 | { | |
670 | if (user) | |
671 | atomic_long_sub(pages, &user->locked_vm); | |
672 | } | |
673 | ||
aaac3ba9 AS |
674 | static int bpf_prog_charge_memlock(struct bpf_prog *prog) |
675 | { | |
676 | struct user_struct *user = get_current_user(); | |
5ccb071e | 677 | int ret; |
aaac3ba9 | 678 | |
5ccb071e DB |
679 | ret = __bpf_prog_charge(user, prog->pages); |
680 | if (ret) { | |
aaac3ba9 | 681 | free_uid(user); |
5ccb071e | 682 | return ret; |
aaac3ba9 | 683 | } |
5ccb071e | 684 | |
aaac3ba9 AS |
685 | prog->aux->user = user; |
686 | return 0; | |
687 | } | |
688 | ||
689 | static void bpf_prog_uncharge_memlock(struct bpf_prog *prog) | |
690 | { | |
691 | struct user_struct *user = prog->aux->user; | |
692 | ||
5ccb071e | 693 | __bpf_prog_uncharge(user, prog->pages); |
aaac3ba9 AS |
694 | free_uid(user); |
695 | } | |
696 | ||
1aacde3d | 697 | static void __bpf_prog_put_rcu(struct rcu_head *rcu) |
abf2e7d6 AS |
698 | { |
699 | struct bpf_prog_aux *aux = container_of(rcu, struct bpf_prog_aux, rcu); | |
700 | ||
701 | free_used_maps(aux); | |
aaac3ba9 | 702 | bpf_prog_uncharge_memlock(aux->prog); |
abf2e7d6 AS |
703 | bpf_prog_free(aux->prog); |
704 | } | |
705 | ||
09756af4 AS |
706 | void bpf_prog_put(struct bpf_prog *prog) |
707 | { | |
a67edbf4 DB |
708 | if (atomic_dec_and_test(&prog->aux->refcnt)) { |
709 | trace_bpf_prog_put_rcu(prog); | |
74451e66 | 710 | bpf_prog_kallsyms_del(prog); |
1aacde3d | 711 | call_rcu(&prog->aux->rcu, __bpf_prog_put_rcu); |
a67edbf4 | 712 | } |
09756af4 | 713 | } |
e2e9b654 | 714 | EXPORT_SYMBOL_GPL(bpf_prog_put); |
09756af4 AS |
715 | |
716 | static int bpf_prog_release(struct inode *inode, struct file *filp) | |
717 | { | |
718 | struct bpf_prog *prog = filp->private_data; | |
719 | ||
1aacde3d | 720 | bpf_prog_put(prog); |
09756af4 AS |
721 | return 0; |
722 | } | |
723 | ||
7bd509e3 DB |
724 | #ifdef CONFIG_PROC_FS |
725 | static void bpf_prog_show_fdinfo(struct seq_file *m, struct file *filp) | |
726 | { | |
727 | const struct bpf_prog *prog = filp->private_data; | |
f1f7714e | 728 | char prog_tag[sizeof(prog->tag) * 2 + 1] = { }; |
7bd509e3 | 729 | |
f1f7714e | 730 | bin2hex(prog_tag, prog->tag, sizeof(prog->tag)); |
7bd509e3 DB |
731 | seq_printf(m, |
732 | "prog_type:\t%u\n" | |
733 | "prog_jited:\t%u\n" | |
f1f7714e | 734 | "prog_tag:\t%s\n" |
7bd509e3 DB |
735 | "memlock:\t%llu\n", |
736 | prog->type, | |
737 | prog->jited, | |
f1f7714e | 738 | prog_tag, |
7bd509e3 DB |
739 | prog->pages * 1ULL << PAGE_SHIFT); |
740 | } | |
741 | #endif | |
742 | ||
09756af4 | 743 | static const struct file_operations bpf_prog_fops = { |
7bd509e3 DB |
744 | #ifdef CONFIG_PROC_FS |
745 | .show_fdinfo = bpf_prog_show_fdinfo, | |
746 | #endif | |
747 | .release = bpf_prog_release, | |
09756af4 AS |
748 | }; |
749 | ||
b2197755 | 750 | int bpf_prog_new_fd(struct bpf_prog *prog) |
aa79781b DB |
751 | { |
752 | return anon_inode_getfd("bpf-prog", &bpf_prog_fops, prog, | |
753 | O_RDWR | O_CLOEXEC); | |
754 | } | |
755 | ||
113214be | 756 | static struct bpf_prog *____bpf_prog_get(struct fd f) |
09756af4 | 757 | { |
09756af4 AS |
758 | if (!f.file) |
759 | return ERR_PTR(-EBADF); | |
09756af4 AS |
760 | if (f.file->f_op != &bpf_prog_fops) { |
761 | fdput(f); | |
762 | return ERR_PTR(-EINVAL); | |
763 | } | |
764 | ||
c2101297 | 765 | return f.file->private_data; |
09756af4 AS |
766 | } |
767 | ||
59d3656d | 768 | struct bpf_prog *bpf_prog_add(struct bpf_prog *prog, int i) |
92117d84 | 769 | { |
59d3656d BB |
770 | if (atomic_add_return(i, &prog->aux->refcnt) > BPF_MAX_REFCNT) { |
771 | atomic_sub(i, &prog->aux->refcnt); | |
92117d84 AS |
772 | return ERR_PTR(-EBUSY); |
773 | } | |
774 | return prog; | |
775 | } | |
59d3656d BB |
776 | EXPORT_SYMBOL_GPL(bpf_prog_add); |
777 | ||
c540594f DB |
778 | void bpf_prog_sub(struct bpf_prog *prog, int i) |
779 | { | |
780 | /* Only to be used for undoing previous bpf_prog_add() in some | |
781 | * error path. We still know that another entity in our call | |
782 | * path holds a reference to the program, thus atomic_sub() can | |
783 | * be safely used in such cases! | |
784 | */ | |
785 | WARN_ON(atomic_sub_return(i, &prog->aux->refcnt) == 0); | |
786 | } | |
787 | EXPORT_SYMBOL_GPL(bpf_prog_sub); | |
788 | ||
59d3656d BB |
789 | struct bpf_prog *bpf_prog_inc(struct bpf_prog *prog) |
790 | { | |
791 | return bpf_prog_add(prog, 1); | |
792 | } | |
97bc402d | 793 | EXPORT_SYMBOL_GPL(bpf_prog_inc); |
92117d84 | 794 | |
113214be | 795 | static struct bpf_prog *__bpf_prog_get(u32 ufd, enum bpf_prog_type *type) |
09756af4 AS |
796 | { |
797 | struct fd f = fdget(ufd); | |
798 | struct bpf_prog *prog; | |
799 | ||
113214be | 800 | prog = ____bpf_prog_get(f); |
09756af4 AS |
801 | if (IS_ERR(prog)) |
802 | return prog; | |
113214be DB |
803 | if (type && prog->type != *type) { |
804 | prog = ERR_PTR(-EINVAL); | |
805 | goto out; | |
806 | } | |
09756af4 | 807 | |
92117d84 | 808 | prog = bpf_prog_inc(prog); |
113214be | 809 | out: |
09756af4 AS |
810 | fdput(f); |
811 | return prog; | |
812 | } | |
113214be DB |
813 | |
814 | struct bpf_prog *bpf_prog_get(u32 ufd) | |
815 | { | |
816 | return __bpf_prog_get(ufd, NULL); | |
817 | } | |
818 | ||
819 | struct bpf_prog *bpf_prog_get_type(u32 ufd, enum bpf_prog_type type) | |
820 | { | |
a67edbf4 DB |
821 | struct bpf_prog *prog = __bpf_prog_get(ufd, &type); |
822 | ||
823 | if (!IS_ERR(prog)) | |
824 | trace_bpf_prog_get_type(prog); | |
825 | return prog; | |
113214be DB |
826 | } |
827 | EXPORT_SYMBOL_GPL(bpf_prog_get_type); | |
09756af4 AS |
828 | |
829 | /* last field in 'union bpf_attr' used by this command */ | |
2541517c | 830 | #define BPF_PROG_LOAD_LAST_FIELD kern_version |
09756af4 AS |
831 | |
832 | static int bpf_prog_load(union bpf_attr *attr) | |
833 | { | |
834 | enum bpf_prog_type type = attr->prog_type; | |
835 | struct bpf_prog *prog; | |
836 | int err; | |
837 | char license[128]; | |
838 | bool is_gpl; | |
839 | ||
840 | if (CHECK_ATTR(BPF_PROG_LOAD)) | |
841 | return -EINVAL; | |
842 | ||
843 | /* copy eBPF program license from user space */ | |
535e7b4b | 844 | if (strncpy_from_user(license, u64_to_user_ptr(attr->license), |
09756af4 AS |
845 | sizeof(license) - 1) < 0) |
846 | return -EFAULT; | |
847 | license[sizeof(license) - 1] = 0; | |
848 | ||
849 | /* eBPF programs must be GPL compatible to use GPL-ed functions */ | |
850 | is_gpl = license_is_gpl_compatible(license); | |
851 | ||
ef0915ca DB |
852 | if (attr->insn_cnt == 0 || attr->insn_cnt > BPF_MAXINSNS) |
853 | return -E2BIG; | |
09756af4 | 854 | |
2541517c AS |
855 | if (type == BPF_PROG_TYPE_KPROBE && |
856 | attr->kern_version != LINUX_VERSION_CODE) | |
857 | return -EINVAL; | |
858 | ||
1be7f75d AS |
859 | if (type != BPF_PROG_TYPE_SOCKET_FILTER && !capable(CAP_SYS_ADMIN)) |
860 | return -EPERM; | |
861 | ||
09756af4 AS |
862 | /* plain bpf_prog allocation */ |
863 | prog = bpf_prog_alloc(bpf_prog_size(attr->insn_cnt), GFP_USER); | |
864 | if (!prog) | |
865 | return -ENOMEM; | |
866 | ||
aaac3ba9 AS |
867 | err = bpf_prog_charge_memlock(prog); |
868 | if (err) | |
869 | goto free_prog_nouncharge; | |
870 | ||
09756af4 AS |
871 | prog->len = attr->insn_cnt; |
872 | ||
873 | err = -EFAULT; | |
535e7b4b | 874 | if (copy_from_user(prog->insns, u64_to_user_ptr(attr->insns), |
aafe6ae9 | 875 | bpf_prog_insn_size(prog)) != 0) |
09756af4 AS |
876 | goto free_prog; |
877 | ||
878 | prog->orig_prog = NULL; | |
a91263d5 | 879 | prog->jited = 0; |
09756af4 AS |
880 | |
881 | atomic_set(&prog->aux->refcnt, 1); | |
a91263d5 | 882 | prog->gpl_compatible = is_gpl ? 1 : 0; |
09756af4 AS |
883 | |
884 | /* find program type: socket_filter vs tracing_filter */ | |
885 | err = find_prog_type(type, prog); | |
886 | if (err < 0) | |
887 | goto free_prog; | |
888 | ||
889 | /* run eBPF verifier */ | |
9bac3d6d | 890 | err = bpf_check(&prog, attr); |
09756af4 AS |
891 | if (err < 0) |
892 | goto free_used_maps; | |
893 | ||
0a542a86 AS |
894 | /* fixup BPF_CALL->imm field */ |
895 | fixup_bpf_calls(prog); | |
896 | ||
09756af4 | 897 | /* eBPF program is ready to be JITed */ |
d1c55ab5 | 898 | prog = bpf_prog_select_runtime(prog, &err); |
04fd61ab AS |
899 | if (err < 0) |
900 | goto free_used_maps; | |
09756af4 | 901 | |
aa79781b | 902 | err = bpf_prog_new_fd(prog); |
09756af4 AS |
903 | if (err < 0) |
904 | /* failed to allocate fd */ | |
905 | goto free_used_maps; | |
906 | ||
74451e66 | 907 | bpf_prog_kallsyms_add(prog); |
a67edbf4 | 908 | trace_bpf_prog_load(prog, err); |
09756af4 AS |
909 | return err; |
910 | ||
911 | free_used_maps: | |
912 | free_used_maps(prog->aux); | |
913 | free_prog: | |
aaac3ba9 AS |
914 | bpf_prog_uncharge_memlock(prog); |
915 | free_prog_nouncharge: | |
09756af4 AS |
916 | bpf_prog_free(prog); |
917 | return err; | |
918 | } | |
919 | ||
b2197755 DB |
920 | #define BPF_OBJ_LAST_FIELD bpf_fd |
921 | ||
922 | static int bpf_obj_pin(const union bpf_attr *attr) | |
923 | { | |
924 | if (CHECK_ATTR(BPF_OBJ)) | |
925 | return -EINVAL; | |
926 | ||
535e7b4b | 927 | return bpf_obj_pin_user(attr->bpf_fd, u64_to_user_ptr(attr->pathname)); |
b2197755 DB |
928 | } |
929 | ||
930 | static int bpf_obj_get(const union bpf_attr *attr) | |
931 | { | |
932 | if (CHECK_ATTR(BPF_OBJ) || attr->bpf_fd != 0) | |
933 | return -EINVAL; | |
934 | ||
535e7b4b | 935 | return bpf_obj_get_user(u64_to_user_ptr(attr->pathname)); |
b2197755 DB |
936 | } |
937 | ||
f4324551 DM |
938 | #ifdef CONFIG_CGROUP_BPF |
939 | ||
7f677633 | 940 | #define BPF_PROG_ATTACH_LAST_FIELD attach_flags |
f4324551 DM |
941 | |
942 | static int bpf_prog_attach(const union bpf_attr *attr) | |
943 | { | |
7f677633 | 944 | enum bpf_prog_type ptype; |
f4324551 DM |
945 | struct bpf_prog *prog; |
946 | struct cgroup *cgrp; | |
7f677633 | 947 | int ret; |
f4324551 DM |
948 | |
949 | if (!capable(CAP_NET_ADMIN)) | |
950 | return -EPERM; | |
951 | ||
952 | if (CHECK_ATTR(BPF_PROG_ATTACH)) | |
953 | return -EINVAL; | |
954 | ||
7f677633 AS |
955 | if (attr->attach_flags & ~BPF_F_ALLOW_OVERRIDE) |
956 | return -EINVAL; | |
957 | ||
f4324551 DM |
958 | switch (attr->attach_type) { |
959 | case BPF_CGROUP_INET_INGRESS: | |
960 | case BPF_CGROUP_INET_EGRESS: | |
b2cd1257 | 961 | ptype = BPF_PROG_TYPE_CGROUP_SKB; |
f4324551 | 962 | break; |
61023658 DA |
963 | case BPF_CGROUP_INET_SOCK_CREATE: |
964 | ptype = BPF_PROG_TYPE_CGROUP_SOCK; | |
965 | break; | |
f4324551 DM |
966 | default: |
967 | return -EINVAL; | |
968 | } | |
969 | ||
b2cd1257 DA |
970 | prog = bpf_prog_get_type(attr->attach_bpf_fd, ptype); |
971 | if (IS_ERR(prog)) | |
972 | return PTR_ERR(prog); | |
973 | ||
974 | cgrp = cgroup_get_from_fd(attr->target_fd); | |
975 | if (IS_ERR(cgrp)) { | |
976 | bpf_prog_put(prog); | |
977 | return PTR_ERR(cgrp); | |
978 | } | |
979 | ||
7f677633 AS |
980 | ret = cgroup_bpf_update(cgrp, prog, attr->attach_type, |
981 | attr->attach_flags & BPF_F_ALLOW_OVERRIDE); | |
982 | if (ret) | |
983 | bpf_prog_put(prog); | |
b2cd1257 DA |
984 | cgroup_put(cgrp); |
985 | ||
7f677633 | 986 | return ret; |
f4324551 DM |
987 | } |
988 | ||
989 | #define BPF_PROG_DETACH_LAST_FIELD attach_type | |
990 | ||
991 | static int bpf_prog_detach(const union bpf_attr *attr) | |
992 | { | |
993 | struct cgroup *cgrp; | |
7f677633 | 994 | int ret; |
f4324551 DM |
995 | |
996 | if (!capable(CAP_NET_ADMIN)) | |
997 | return -EPERM; | |
998 | ||
999 | if (CHECK_ATTR(BPF_PROG_DETACH)) | |
1000 | return -EINVAL; | |
1001 | ||
1002 | switch (attr->attach_type) { | |
1003 | case BPF_CGROUP_INET_INGRESS: | |
1004 | case BPF_CGROUP_INET_EGRESS: | |
61023658 | 1005 | case BPF_CGROUP_INET_SOCK_CREATE: |
f4324551 DM |
1006 | cgrp = cgroup_get_from_fd(attr->target_fd); |
1007 | if (IS_ERR(cgrp)) | |
1008 | return PTR_ERR(cgrp); | |
1009 | ||
7f677633 | 1010 | ret = cgroup_bpf_update(cgrp, NULL, attr->attach_type, false); |
f4324551 DM |
1011 | cgroup_put(cgrp); |
1012 | break; | |
1013 | ||
1014 | default: | |
1015 | return -EINVAL; | |
1016 | } | |
1017 | ||
7f677633 | 1018 | return ret; |
f4324551 DM |
1019 | } |
1020 | #endif /* CONFIG_CGROUP_BPF */ | |
1021 | ||
99c55f7d AS |
1022 | SYSCALL_DEFINE3(bpf, int, cmd, union bpf_attr __user *, uattr, unsigned int, size) |
1023 | { | |
1024 | union bpf_attr attr = {}; | |
1025 | int err; | |
1026 | ||
1be7f75d | 1027 | if (!capable(CAP_SYS_ADMIN) && sysctl_unprivileged_bpf_disabled) |
99c55f7d AS |
1028 | return -EPERM; |
1029 | ||
1030 | if (!access_ok(VERIFY_READ, uattr, 1)) | |
1031 | return -EFAULT; | |
1032 | ||
1033 | if (size > PAGE_SIZE) /* silly large */ | |
1034 | return -E2BIG; | |
1035 | ||
1036 | /* If we're handed a bigger struct than we know of, | |
1037 | * ensure all the unknown bits are 0 - i.e. new | |
1038 | * user-space does not rely on any kernel feature | |
1039 | * extensions we dont know about yet. | |
1040 | */ | |
1041 | if (size > sizeof(attr)) { | |
1042 | unsigned char __user *addr; | |
1043 | unsigned char __user *end; | |
1044 | unsigned char val; | |
1045 | ||
1046 | addr = (void __user *)uattr + sizeof(attr); | |
1047 | end = (void __user *)uattr + size; | |
1048 | ||
1049 | for (; addr < end; addr++) { | |
1050 | err = get_user(val, addr); | |
1051 | if (err) | |
1052 | return err; | |
1053 | if (val) | |
1054 | return -E2BIG; | |
1055 | } | |
1056 | size = sizeof(attr); | |
1057 | } | |
1058 | ||
1059 | /* copy attributes from user space, may be less than sizeof(bpf_attr) */ | |
1060 | if (copy_from_user(&attr, uattr, size) != 0) | |
1061 | return -EFAULT; | |
1062 | ||
1063 | switch (cmd) { | |
1064 | case BPF_MAP_CREATE: | |
1065 | err = map_create(&attr); | |
1066 | break; | |
db20fd2b AS |
1067 | case BPF_MAP_LOOKUP_ELEM: |
1068 | err = map_lookup_elem(&attr); | |
1069 | break; | |
1070 | case BPF_MAP_UPDATE_ELEM: | |
1071 | err = map_update_elem(&attr); | |
1072 | break; | |
1073 | case BPF_MAP_DELETE_ELEM: | |
1074 | err = map_delete_elem(&attr); | |
1075 | break; | |
1076 | case BPF_MAP_GET_NEXT_KEY: | |
1077 | err = map_get_next_key(&attr); | |
1078 | break; | |
09756af4 AS |
1079 | case BPF_PROG_LOAD: |
1080 | err = bpf_prog_load(&attr); | |
1081 | break; | |
b2197755 DB |
1082 | case BPF_OBJ_PIN: |
1083 | err = bpf_obj_pin(&attr); | |
1084 | break; | |
1085 | case BPF_OBJ_GET: | |
1086 | err = bpf_obj_get(&attr); | |
1087 | break; | |
f4324551 DM |
1088 | |
1089 | #ifdef CONFIG_CGROUP_BPF | |
1090 | case BPF_PROG_ATTACH: | |
1091 | err = bpf_prog_attach(&attr); | |
1092 | break; | |
1093 | case BPF_PROG_DETACH: | |
1094 | err = bpf_prog_detach(&attr); | |
1095 | break; | |
1096 | #endif | |
1097 | ||
99c55f7d AS |
1098 | default: |
1099 | err = -EINVAL; | |
1100 | break; | |
1101 | } | |
1102 | ||
1103 | return err; | |
1104 | } |