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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> | |
13 | #include <linux/syscalls.h> | |
14 | #include <linux/slab.h> | |
d407bd25 DB |
15 | #include <linux/vmalloc.h> |
16 | #include <linux/mmzone.h> | |
99c55f7d | 17 | #include <linux/anon_inodes.h> |
db20fd2b | 18 | #include <linux/file.h> |
09756af4 AS |
19 | #include <linux/license.h> |
20 | #include <linux/filter.h> | |
2541517c | 21 | #include <linux/version.h> |
535e7b4b | 22 | #include <linux/kernel.h> |
99c55f7d | 23 | |
b121d1e7 AS |
24 | DEFINE_PER_CPU(int, bpf_prog_active); |
25 | ||
1be7f75d AS |
26 | int sysctl_unprivileged_bpf_disabled __read_mostly; |
27 | ||
99c55f7d AS |
28 | static LIST_HEAD(bpf_map_types); |
29 | ||
30 | static struct bpf_map *find_and_alloc_map(union bpf_attr *attr) | |
31 | { | |
32 | struct bpf_map_type_list *tl; | |
33 | struct bpf_map *map; | |
34 | ||
35 | list_for_each_entry(tl, &bpf_map_types, list_node) { | |
36 | if (tl->type == attr->map_type) { | |
37 | map = tl->ops->map_alloc(attr); | |
38 | if (IS_ERR(map)) | |
39 | return map; | |
40 | map->ops = tl->ops; | |
41 | map->map_type = attr->map_type; | |
42 | return map; | |
43 | } | |
44 | } | |
45 | return ERR_PTR(-EINVAL); | |
46 | } | |
47 | ||
48 | /* boot time registration of different map implementations */ | |
49 | void bpf_register_map_type(struct bpf_map_type_list *tl) | |
50 | { | |
51 | list_add(&tl->list_node, &bpf_map_types); | |
52 | } | |
53 | ||
d407bd25 DB |
54 | void *bpf_map_area_alloc(size_t size) |
55 | { | |
56 | /* We definitely need __GFP_NORETRY, so OOM killer doesn't | |
57 | * trigger under memory pressure as we really just want to | |
58 | * fail instead. | |
59 | */ | |
60 | const gfp_t flags = __GFP_NOWARN | __GFP_NORETRY | __GFP_ZERO; | |
61 | void *area; | |
62 | ||
63 | if (size <= (PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER)) { | |
64 | area = kmalloc(size, GFP_USER | flags); | |
65 | if (area != NULL) | |
66 | return area; | |
67 | } | |
68 | ||
69 | return __vmalloc(size, GFP_KERNEL | __GFP_HIGHMEM | flags, | |
70 | PAGE_KERNEL); | |
71 | } | |
72 | ||
73 | void bpf_map_area_free(void *area) | |
74 | { | |
75 | kvfree(area); | |
76 | } | |
77 | ||
6c905981 AS |
78 | int bpf_map_precharge_memlock(u32 pages) |
79 | { | |
80 | struct user_struct *user = get_current_user(); | |
81 | unsigned long memlock_limit, cur; | |
82 | ||
83 | memlock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
84 | cur = atomic_long_read(&user->locked_vm); | |
85 | free_uid(user); | |
86 | if (cur + pages > memlock_limit) | |
87 | return -EPERM; | |
88 | return 0; | |
89 | } | |
90 | ||
aaac3ba9 AS |
91 | static int bpf_map_charge_memlock(struct bpf_map *map) |
92 | { | |
93 | struct user_struct *user = get_current_user(); | |
94 | unsigned long memlock_limit; | |
95 | ||
96 | memlock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
97 | ||
98 | atomic_long_add(map->pages, &user->locked_vm); | |
99 | ||
100 | if (atomic_long_read(&user->locked_vm) > memlock_limit) { | |
101 | atomic_long_sub(map->pages, &user->locked_vm); | |
102 | free_uid(user); | |
103 | return -EPERM; | |
104 | } | |
105 | map->user = user; | |
106 | return 0; | |
107 | } | |
108 | ||
109 | static void bpf_map_uncharge_memlock(struct bpf_map *map) | |
110 | { | |
111 | struct user_struct *user = map->user; | |
112 | ||
113 | atomic_long_sub(map->pages, &user->locked_vm); | |
114 | free_uid(user); | |
115 | } | |
116 | ||
99c55f7d AS |
117 | /* called from workqueue */ |
118 | static void bpf_map_free_deferred(struct work_struct *work) | |
119 | { | |
120 | struct bpf_map *map = container_of(work, struct bpf_map, work); | |
121 | ||
aaac3ba9 | 122 | bpf_map_uncharge_memlock(map); |
99c55f7d AS |
123 | /* implementation dependent freeing */ |
124 | map->ops->map_free(map); | |
125 | } | |
126 | ||
c9da161c DB |
127 | static void bpf_map_put_uref(struct bpf_map *map) |
128 | { | |
129 | if (atomic_dec_and_test(&map->usercnt)) { | |
130 | if (map->map_type == BPF_MAP_TYPE_PROG_ARRAY) | |
131 | bpf_fd_array_map_clear(map); | |
132 | } | |
133 | } | |
134 | ||
99c55f7d AS |
135 | /* decrement map refcnt and schedule it for freeing via workqueue |
136 | * (unrelying map implementation ops->map_free() might sleep) | |
137 | */ | |
138 | void bpf_map_put(struct bpf_map *map) | |
139 | { | |
140 | if (atomic_dec_and_test(&map->refcnt)) { | |
141 | INIT_WORK(&map->work, bpf_map_free_deferred); | |
142 | schedule_work(&map->work); | |
143 | } | |
144 | } | |
145 | ||
c9da161c | 146 | void bpf_map_put_with_uref(struct bpf_map *map) |
99c55f7d | 147 | { |
c9da161c | 148 | bpf_map_put_uref(map); |
99c55f7d | 149 | bpf_map_put(map); |
c9da161c DB |
150 | } |
151 | ||
152 | static int bpf_map_release(struct inode *inode, struct file *filp) | |
153 | { | |
61d1b6a4 DB |
154 | struct bpf_map *map = filp->private_data; |
155 | ||
156 | if (map->ops->map_release) | |
157 | map->ops->map_release(map, filp); | |
158 | ||
159 | bpf_map_put_with_uref(map); | |
99c55f7d AS |
160 | return 0; |
161 | } | |
162 | ||
f99bf205 DB |
163 | #ifdef CONFIG_PROC_FS |
164 | static void bpf_map_show_fdinfo(struct seq_file *m, struct file *filp) | |
165 | { | |
166 | const struct bpf_map *map = filp->private_data; | |
21116b70 DB |
167 | const struct bpf_array *array; |
168 | u32 owner_prog_type = 0; | |
169 | ||
170 | if (map->map_type == BPF_MAP_TYPE_PROG_ARRAY) { | |
171 | array = container_of(map, struct bpf_array, map); | |
172 | owner_prog_type = array->owner_prog_type; | |
173 | } | |
f99bf205 DB |
174 | |
175 | seq_printf(m, | |
176 | "map_type:\t%u\n" | |
177 | "key_size:\t%u\n" | |
178 | "value_size:\t%u\n" | |
322cea2f | 179 | "max_entries:\t%u\n" |
21116b70 DB |
180 | "map_flags:\t%#x\n" |
181 | "memlock:\t%llu\n", | |
f99bf205 DB |
182 | map->map_type, |
183 | map->key_size, | |
184 | map->value_size, | |
322cea2f | 185 | map->max_entries, |
21116b70 DB |
186 | map->map_flags, |
187 | map->pages * 1ULL << PAGE_SHIFT); | |
188 | ||
189 | if (owner_prog_type) | |
190 | seq_printf(m, "owner_prog_type:\t%u\n", | |
191 | owner_prog_type); | |
f99bf205 DB |
192 | } |
193 | #endif | |
194 | ||
99c55f7d | 195 | static const struct file_operations bpf_map_fops = { |
f99bf205 DB |
196 | #ifdef CONFIG_PROC_FS |
197 | .show_fdinfo = bpf_map_show_fdinfo, | |
198 | #endif | |
199 | .release = bpf_map_release, | |
99c55f7d AS |
200 | }; |
201 | ||
b2197755 | 202 | int bpf_map_new_fd(struct bpf_map *map) |
aa79781b DB |
203 | { |
204 | return anon_inode_getfd("bpf-map", &bpf_map_fops, map, | |
205 | O_RDWR | O_CLOEXEC); | |
206 | } | |
207 | ||
99c55f7d AS |
208 | /* helper macro to check that unused fields 'union bpf_attr' are zero */ |
209 | #define CHECK_ATTR(CMD) \ | |
210 | memchr_inv((void *) &attr->CMD##_LAST_FIELD + \ | |
211 | sizeof(attr->CMD##_LAST_FIELD), 0, \ | |
212 | sizeof(*attr) - \ | |
213 | offsetof(union bpf_attr, CMD##_LAST_FIELD) - \ | |
214 | sizeof(attr->CMD##_LAST_FIELD)) != NULL | |
215 | ||
6c905981 | 216 | #define BPF_MAP_CREATE_LAST_FIELD map_flags |
99c55f7d AS |
217 | /* called via syscall */ |
218 | static int map_create(union bpf_attr *attr) | |
219 | { | |
220 | struct bpf_map *map; | |
221 | int err; | |
222 | ||
223 | err = CHECK_ATTR(BPF_MAP_CREATE); | |
224 | if (err) | |
225 | return -EINVAL; | |
226 | ||
227 | /* find map type and init map: hashtable vs rbtree vs bloom vs ... */ | |
228 | map = find_and_alloc_map(attr); | |
229 | if (IS_ERR(map)) | |
230 | return PTR_ERR(map); | |
231 | ||
232 | atomic_set(&map->refcnt, 1); | |
c9da161c | 233 | atomic_set(&map->usercnt, 1); |
99c55f7d | 234 | |
aaac3ba9 AS |
235 | err = bpf_map_charge_memlock(map); |
236 | if (err) | |
20b2b24f | 237 | goto free_map_nouncharge; |
aaac3ba9 | 238 | |
aa79781b | 239 | err = bpf_map_new_fd(map); |
99c55f7d AS |
240 | if (err < 0) |
241 | /* failed to allocate fd */ | |
242 | goto free_map; | |
243 | ||
244 | return err; | |
245 | ||
246 | free_map: | |
20b2b24f DB |
247 | bpf_map_uncharge_memlock(map); |
248 | free_map_nouncharge: | |
99c55f7d AS |
249 | map->ops->map_free(map); |
250 | return err; | |
251 | } | |
252 | ||
db20fd2b AS |
253 | /* if error is returned, fd is released. |
254 | * On success caller should complete fd access with matching fdput() | |
255 | */ | |
c2101297 | 256 | struct bpf_map *__bpf_map_get(struct fd f) |
db20fd2b | 257 | { |
db20fd2b AS |
258 | if (!f.file) |
259 | return ERR_PTR(-EBADF); | |
db20fd2b AS |
260 | if (f.file->f_op != &bpf_map_fops) { |
261 | fdput(f); | |
262 | return ERR_PTR(-EINVAL); | |
263 | } | |
264 | ||
c2101297 DB |
265 | return f.file->private_data; |
266 | } | |
267 | ||
92117d84 AS |
268 | /* prog's and map's refcnt limit */ |
269 | #define BPF_MAX_REFCNT 32768 | |
270 | ||
271 | struct bpf_map *bpf_map_inc(struct bpf_map *map, bool uref) | |
c9da161c | 272 | { |
92117d84 AS |
273 | if (atomic_inc_return(&map->refcnt) > BPF_MAX_REFCNT) { |
274 | atomic_dec(&map->refcnt); | |
275 | return ERR_PTR(-EBUSY); | |
276 | } | |
c9da161c DB |
277 | if (uref) |
278 | atomic_inc(&map->usercnt); | |
92117d84 | 279 | return map; |
c9da161c DB |
280 | } |
281 | ||
282 | struct bpf_map *bpf_map_get_with_uref(u32 ufd) | |
c2101297 DB |
283 | { |
284 | struct fd f = fdget(ufd); | |
285 | struct bpf_map *map; | |
286 | ||
287 | map = __bpf_map_get(f); | |
288 | if (IS_ERR(map)) | |
289 | return map; | |
290 | ||
92117d84 | 291 | map = bpf_map_inc(map, true); |
c2101297 | 292 | fdput(f); |
db20fd2b AS |
293 | |
294 | return map; | |
295 | } | |
296 | ||
b8cdc051 AS |
297 | int __weak bpf_stackmap_copy(struct bpf_map *map, void *key, void *value) |
298 | { | |
299 | return -ENOTSUPP; | |
300 | } | |
301 | ||
db20fd2b AS |
302 | /* last field in 'union bpf_attr' used by this command */ |
303 | #define BPF_MAP_LOOKUP_ELEM_LAST_FIELD value | |
304 | ||
305 | static int map_lookup_elem(union bpf_attr *attr) | |
306 | { | |
535e7b4b MS |
307 | void __user *ukey = u64_to_user_ptr(attr->key); |
308 | void __user *uvalue = u64_to_user_ptr(attr->value); | |
db20fd2b | 309 | int ufd = attr->map_fd; |
db20fd2b | 310 | struct bpf_map *map; |
8ebe667c | 311 | void *key, *value, *ptr; |
15a07b33 | 312 | u32 value_size; |
592867bf | 313 | struct fd f; |
db20fd2b AS |
314 | int err; |
315 | ||
316 | if (CHECK_ATTR(BPF_MAP_LOOKUP_ELEM)) | |
317 | return -EINVAL; | |
318 | ||
592867bf | 319 | f = fdget(ufd); |
c2101297 | 320 | map = __bpf_map_get(f); |
db20fd2b AS |
321 | if (IS_ERR(map)) |
322 | return PTR_ERR(map); | |
323 | ||
324 | err = -ENOMEM; | |
325 | key = kmalloc(map->key_size, GFP_USER); | |
326 | if (!key) | |
327 | goto err_put; | |
328 | ||
329 | err = -EFAULT; | |
330 | if (copy_from_user(key, ukey, map->key_size) != 0) | |
331 | goto free_key; | |
332 | ||
15a07b33 | 333 | if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH || |
8f844938 | 334 | map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH || |
15a07b33 AS |
335 | map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY) |
336 | value_size = round_up(map->value_size, 8) * num_possible_cpus(); | |
337 | else | |
338 | value_size = map->value_size; | |
339 | ||
8ebe667c | 340 | err = -ENOMEM; |
15a07b33 | 341 | value = kmalloc(value_size, GFP_USER | __GFP_NOWARN); |
db20fd2b | 342 | if (!value) |
8ebe667c AS |
343 | goto free_key; |
344 | ||
8f844938 MKL |
345 | if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH || |
346 | map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH) { | |
15a07b33 AS |
347 | err = bpf_percpu_hash_copy(map, key, value); |
348 | } else if (map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY) { | |
349 | err = bpf_percpu_array_copy(map, key, value); | |
557c0c6e AS |
350 | } else if (map->map_type == BPF_MAP_TYPE_STACK_TRACE) { |
351 | err = bpf_stackmap_copy(map, key, value); | |
15a07b33 AS |
352 | } else { |
353 | rcu_read_lock(); | |
354 | ptr = map->ops->map_lookup_elem(map, key); | |
355 | if (ptr) | |
356 | memcpy(value, ptr, value_size); | |
357 | rcu_read_unlock(); | |
358 | err = ptr ? 0 : -ENOENT; | |
359 | } | |
8ebe667c | 360 | |
15a07b33 | 361 | if (err) |
8ebe667c | 362 | goto free_value; |
db20fd2b AS |
363 | |
364 | err = -EFAULT; | |
15a07b33 | 365 | if (copy_to_user(uvalue, value, value_size) != 0) |
8ebe667c | 366 | goto free_value; |
db20fd2b AS |
367 | |
368 | err = 0; | |
369 | ||
8ebe667c AS |
370 | free_value: |
371 | kfree(value); | |
db20fd2b AS |
372 | free_key: |
373 | kfree(key); | |
374 | err_put: | |
375 | fdput(f); | |
376 | return err; | |
377 | } | |
378 | ||
3274f520 | 379 | #define BPF_MAP_UPDATE_ELEM_LAST_FIELD flags |
db20fd2b AS |
380 | |
381 | static int map_update_elem(union bpf_attr *attr) | |
382 | { | |
535e7b4b MS |
383 | void __user *ukey = u64_to_user_ptr(attr->key); |
384 | void __user *uvalue = u64_to_user_ptr(attr->value); | |
db20fd2b | 385 | int ufd = attr->map_fd; |
db20fd2b AS |
386 | struct bpf_map *map; |
387 | void *key, *value; | |
15a07b33 | 388 | u32 value_size; |
592867bf | 389 | struct fd f; |
db20fd2b AS |
390 | int err; |
391 | ||
392 | if (CHECK_ATTR(BPF_MAP_UPDATE_ELEM)) | |
393 | return -EINVAL; | |
394 | ||
592867bf | 395 | f = fdget(ufd); |
c2101297 | 396 | map = __bpf_map_get(f); |
db20fd2b AS |
397 | if (IS_ERR(map)) |
398 | return PTR_ERR(map); | |
399 | ||
400 | err = -ENOMEM; | |
401 | key = kmalloc(map->key_size, GFP_USER); | |
402 | if (!key) | |
403 | goto err_put; | |
404 | ||
405 | err = -EFAULT; | |
406 | if (copy_from_user(key, ukey, map->key_size) != 0) | |
407 | goto free_key; | |
408 | ||
15a07b33 | 409 | if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH || |
8f844938 | 410 | map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH || |
15a07b33 AS |
411 | map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY) |
412 | value_size = round_up(map->value_size, 8) * num_possible_cpus(); | |
413 | else | |
414 | value_size = map->value_size; | |
415 | ||
db20fd2b | 416 | err = -ENOMEM; |
15a07b33 | 417 | value = kmalloc(value_size, GFP_USER | __GFP_NOWARN); |
db20fd2b AS |
418 | if (!value) |
419 | goto free_key; | |
420 | ||
421 | err = -EFAULT; | |
15a07b33 | 422 | if (copy_from_user(value, uvalue, value_size) != 0) |
db20fd2b AS |
423 | goto free_value; |
424 | ||
b121d1e7 AS |
425 | /* must increment bpf_prog_active to avoid kprobe+bpf triggering from |
426 | * inside bpf map update or delete otherwise deadlocks are possible | |
427 | */ | |
428 | preempt_disable(); | |
429 | __this_cpu_inc(bpf_prog_active); | |
8f844938 MKL |
430 | if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH || |
431 | map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH) { | |
15a07b33 AS |
432 | err = bpf_percpu_hash_update(map, key, value, attr->flags); |
433 | } else if (map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY) { | |
434 | err = bpf_percpu_array_update(map, key, value, attr->flags); | |
d056a788 | 435 | } else if (map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY || |
4ed8ec52 MKL |
436 | map->map_type == BPF_MAP_TYPE_PROG_ARRAY || |
437 | map->map_type == BPF_MAP_TYPE_CGROUP_ARRAY) { | |
d056a788 DB |
438 | rcu_read_lock(); |
439 | err = bpf_fd_array_map_update_elem(map, f.file, key, value, | |
440 | attr->flags); | |
441 | rcu_read_unlock(); | |
15a07b33 AS |
442 | } else { |
443 | rcu_read_lock(); | |
444 | err = map->ops->map_update_elem(map, key, value, attr->flags); | |
445 | rcu_read_unlock(); | |
446 | } | |
b121d1e7 AS |
447 | __this_cpu_dec(bpf_prog_active); |
448 | preempt_enable(); | |
db20fd2b AS |
449 | |
450 | free_value: | |
451 | kfree(value); | |
452 | free_key: | |
453 | kfree(key); | |
454 | err_put: | |
455 | fdput(f); | |
456 | return err; | |
457 | } | |
458 | ||
459 | #define BPF_MAP_DELETE_ELEM_LAST_FIELD key | |
460 | ||
461 | static int map_delete_elem(union bpf_attr *attr) | |
462 | { | |
535e7b4b | 463 | void __user *ukey = u64_to_user_ptr(attr->key); |
db20fd2b | 464 | int ufd = attr->map_fd; |
db20fd2b | 465 | struct bpf_map *map; |
592867bf | 466 | struct fd f; |
db20fd2b AS |
467 | void *key; |
468 | int err; | |
469 | ||
470 | if (CHECK_ATTR(BPF_MAP_DELETE_ELEM)) | |
471 | return -EINVAL; | |
472 | ||
592867bf | 473 | f = fdget(ufd); |
c2101297 | 474 | map = __bpf_map_get(f); |
db20fd2b AS |
475 | if (IS_ERR(map)) |
476 | return PTR_ERR(map); | |
477 | ||
478 | err = -ENOMEM; | |
479 | key = kmalloc(map->key_size, GFP_USER); | |
480 | if (!key) | |
481 | goto err_put; | |
482 | ||
483 | err = -EFAULT; | |
484 | if (copy_from_user(key, ukey, map->key_size) != 0) | |
485 | goto free_key; | |
486 | ||
b121d1e7 AS |
487 | preempt_disable(); |
488 | __this_cpu_inc(bpf_prog_active); | |
db20fd2b AS |
489 | rcu_read_lock(); |
490 | err = map->ops->map_delete_elem(map, key); | |
491 | rcu_read_unlock(); | |
b121d1e7 AS |
492 | __this_cpu_dec(bpf_prog_active); |
493 | preempt_enable(); | |
db20fd2b AS |
494 | |
495 | free_key: | |
496 | kfree(key); | |
497 | err_put: | |
498 | fdput(f); | |
499 | return err; | |
500 | } | |
501 | ||
502 | /* last field in 'union bpf_attr' used by this command */ | |
503 | #define BPF_MAP_GET_NEXT_KEY_LAST_FIELD next_key | |
504 | ||
505 | static int map_get_next_key(union bpf_attr *attr) | |
506 | { | |
535e7b4b MS |
507 | void __user *ukey = u64_to_user_ptr(attr->key); |
508 | void __user *unext_key = u64_to_user_ptr(attr->next_key); | |
db20fd2b | 509 | int ufd = attr->map_fd; |
db20fd2b AS |
510 | struct bpf_map *map; |
511 | void *key, *next_key; | |
592867bf | 512 | struct fd f; |
db20fd2b AS |
513 | int err; |
514 | ||
515 | if (CHECK_ATTR(BPF_MAP_GET_NEXT_KEY)) | |
516 | return -EINVAL; | |
517 | ||
592867bf | 518 | f = fdget(ufd); |
c2101297 | 519 | map = __bpf_map_get(f); |
db20fd2b AS |
520 | if (IS_ERR(map)) |
521 | return PTR_ERR(map); | |
522 | ||
523 | err = -ENOMEM; | |
524 | key = kmalloc(map->key_size, GFP_USER); | |
525 | if (!key) | |
526 | goto err_put; | |
527 | ||
528 | err = -EFAULT; | |
529 | if (copy_from_user(key, ukey, map->key_size) != 0) | |
530 | goto free_key; | |
531 | ||
532 | err = -ENOMEM; | |
533 | next_key = kmalloc(map->key_size, GFP_USER); | |
534 | if (!next_key) | |
535 | goto free_key; | |
536 | ||
537 | rcu_read_lock(); | |
538 | err = map->ops->map_get_next_key(map, key, next_key); | |
539 | rcu_read_unlock(); | |
540 | if (err) | |
541 | goto free_next_key; | |
542 | ||
543 | err = -EFAULT; | |
544 | if (copy_to_user(unext_key, next_key, map->key_size) != 0) | |
545 | goto free_next_key; | |
546 | ||
547 | err = 0; | |
548 | ||
549 | free_next_key: | |
550 | kfree(next_key); | |
551 | free_key: | |
552 | kfree(key); | |
553 | err_put: | |
554 | fdput(f); | |
555 | return err; | |
556 | } | |
557 | ||
09756af4 AS |
558 | static LIST_HEAD(bpf_prog_types); |
559 | ||
560 | static int find_prog_type(enum bpf_prog_type type, struct bpf_prog *prog) | |
561 | { | |
562 | struct bpf_prog_type_list *tl; | |
563 | ||
564 | list_for_each_entry(tl, &bpf_prog_types, list_node) { | |
565 | if (tl->type == type) { | |
566 | prog->aux->ops = tl->ops; | |
24701ece | 567 | prog->type = type; |
09756af4 AS |
568 | return 0; |
569 | } | |
570 | } | |
24701ece | 571 | |
09756af4 AS |
572 | return -EINVAL; |
573 | } | |
574 | ||
575 | void bpf_register_prog_type(struct bpf_prog_type_list *tl) | |
576 | { | |
577 | list_add(&tl->list_node, &bpf_prog_types); | |
578 | } | |
579 | ||
0a542a86 AS |
580 | /* fixup insn->imm field of bpf_call instructions: |
581 | * if (insn->imm == BPF_FUNC_map_lookup_elem) | |
582 | * insn->imm = bpf_map_lookup_elem - __bpf_call_base; | |
583 | * else if (insn->imm == BPF_FUNC_map_update_elem) | |
584 | * insn->imm = bpf_map_update_elem - __bpf_call_base; | |
585 | * else ... | |
586 | * | |
587 | * this function is called after eBPF program passed verification | |
588 | */ | |
589 | static void fixup_bpf_calls(struct bpf_prog *prog) | |
590 | { | |
591 | const struct bpf_func_proto *fn; | |
592 | int i; | |
593 | ||
594 | for (i = 0; i < prog->len; i++) { | |
595 | struct bpf_insn *insn = &prog->insnsi[i]; | |
596 | ||
597 | if (insn->code == (BPF_JMP | BPF_CALL)) { | |
598 | /* we reach here when program has bpf_call instructions | |
599 | * and it passed bpf_check(), means that | |
600 | * ops->get_func_proto must have been supplied, check it | |
601 | */ | |
602 | BUG_ON(!prog->aux->ops->get_func_proto); | |
603 | ||
c46646d0 DB |
604 | if (insn->imm == BPF_FUNC_get_route_realm) |
605 | prog->dst_needed = 1; | |
3ad00405 DB |
606 | if (insn->imm == BPF_FUNC_get_prandom_u32) |
607 | bpf_user_rnd_init_once(); | |
17bedab2 MKL |
608 | if (insn->imm == BPF_FUNC_xdp_adjust_head) |
609 | prog->xdp_adjust_head = 1; | |
04fd61ab AS |
610 | if (insn->imm == BPF_FUNC_tail_call) { |
611 | /* mark bpf_tail_call as different opcode | |
612 | * to avoid conditional branch in | |
613 | * interpeter for every normal call | |
614 | * and to prevent accidental JITing by | |
615 | * JIT compiler that doesn't support | |
616 | * bpf_tail_call yet | |
617 | */ | |
618 | insn->imm = 0; | |
619 | insn->code |= BPF_X; | |
620 | continue; | |
621 | } | |
622 | ||
0a542a86 AS |
623 | fn = prog->aux->ops->get_func_proto(insn->imm); |
624 | /* all functions that have prototype and verifier allowed | |
625 | * programs to call them, must be real in-kernel functions | |
626 | */ | |
627 | BUG_ON(!fn->func); | |
628 | insn->imm = fn->func - __bpf_call_base; | |
629 | } | |
630 | } | |
631 | } | |
632 | ||
09756af4 AS |
633 | /* drop refcnt on maps used by eBPF program and free auxilary data */ |
634 | static void free_used_maps(struct bpf_prog_aux *aux) | |
635 | { | |
636 | int i; | |
637 | ||
638 | for (i = 0; i < aux->used_map_cnt; i++) | |
639 | bpf_map_put(aux->used_maps[i]); | |
640 | ||
641 | kfree(aux->used_maps); | |
642 | } | |
643 | ||
5ccb071e DB |
644 | int __bpf_prog_charge(struct user_struct *user, u32 pages) |
645 | { | |
646 | unsigned long memlock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
647 | unsigned long user_bufs; | |
648 | ||
649 | if (user) { | |
650 | user_bufs = atomic_long_add_return(pages, &user->locked_vm); | |
651 | if (user_bufs > memlock_limit) { | |
652 | atomic_long_sub(pages, &user->locked_vm); | |
653 | return -EPERM; | |
654 | } | |
655 | } | |
656 | ||
657 | return 0; | |
658 | } | |
659 | ||
660 | void __bpf_prog_uncharge(struct user_struct *user, u32 pages) | |
661 | { | |
662 | if (user) | |
663 | atomic_long_sub(pages, &user->locked_vm); | |
664 | } | |
665 | ||
aaac3ba9 AS |
666 | static int bpf_prog_charge_memlock(struct bpf_prog *prog) |
667 | { | |
668 | struct user_struct *user = get_current_user(); | |
5ccb071e | 669 | int ret; |
aaac3ba9 | 670 | |
5ccb071e DB |
671 | ret = __bpf_prog_charge(user, prog->pages); |
672 | if (ret) { | |
aaac3ba9 | 673 | free_uid(user); |
5ccb071e | 674 | return ret; |
aaac3ba9 | 675 | } |
5ccb071e | 676 | |
aaac3ba9 AS |
677 | prog->aux->user = user; |
678 | return 0; | |
679 | } | |
680 | ||
681 | static void bpf_prog_uncharge_memlock(struct bpf_prog *prog) | |
682 | { | |
683 | struct user_struct *user = prog->aux->user; | |
684 | ||
5ccb071e | 685 | __bpf_prog_uncharge(user, prog->pages); |
aaac3ba9 AS |
686 | free_uid(user); |
687 | } | |
688 | ||
1aacde3d | 689 | static void __bpf_prog_put_rcu(struct rcu_head *rcu) |
abf2e7d6 AS |
690 | { |
691 | struct bpf_prog_aux *aux = container_of(rcu, struct bpf_prog_aux, rcu); | |
692 | ||
693 | free_used_maps(aux); | |
aaac3ba9 | 694 | bpf_prog_uncharge_memlock(aux->prog); |
abf2e7d6 AS |
695 | bpf_prog_free(aux->prog); |
696 | } | |
697 | ||
09756af4 AS |
698 | void bpf_prog_put(struct bpf_prog *prog) |
699 | { | |
e9d8afa9 | 700 | if (atomic_dec_and_test(&prog->aux->refcnt)) |
1aacde3d | 701 | call_rcu(&prog->aux->rcu, __bpf_prog_put_rcu); |
09756af4 | 702 | } |
e2e9b654 | 703 | EXPORT_SYMBOL_GPL(bpf_prog_put); |
09756af4 AS |
704 | |
705 | static int bpf_prog_release(struct inode *inode, struct file *filp) | |
706 | { | |
707 | struct bpf_prog *prog = filp->private_data; | |
708 | ||
1aacde3d | 709 | bpf_prog_put(prog); |
09756af4 AS |
710 | return 0; |
711 | } | |
712 | ||
7bd509e3 DB |
713 | #ifdef CONFIG_PROC_FS |
714 | static void bpf_prog_show_fdinfo(struct seq_file *m, struct file *filp) | |
715 | { | |
716 | const struct bpf_prog *prog = filp->private_data; | |
f1f7714e | 717 | char prog_tag[sizeof(prog->tag) * 2 + 1] = { }; |
7bd509e3 | 718 | |
f1f7714e | 719 | bin2hex(prog_tag, prog->tag, sizeof(prog->tag)); |
7bd509e3 DB |
720 | seq_printf(m, |
721 | "prog_type:\t%u\n" | |
722 | "prog_jited:\t%u\n" | |
f1f7714e | 723 | "prog_tag:\t%s\n" |
7bd509e3 DB |
724 | "memlock:\t%llu\n", |
725 | prog->type, | |
726 | prog->jited, | |
f1f7714e | 727 | prog_tag, |
7bd509e3 DB |
728 | prog->pages * 1ULL << PAGE_SHIFT); |
729 | } | |
730 | #endif | |
731 | ||
09756af4 | 732 | static const struct file_operations bpf_prog_fops = { |
7bd509e3 DB |
733 | #ifdef CONFIG_PROC_FS |
734 | .show_fdinfo = bpf_prog_show_fdinfo, | |
735 | #endif | |
736 | .release = bpf_prog_release, | |
09756af4 AS |
737 | }; |
738 | ||
b2197755 | 739 | int bpf_prog_new_fd(struct bpf_prog *prog) |
aa79781b DB |
740 | { |
741 | return anon_inode_getfd("bpf-prog", &bpf_prog_fops, prog, | |
742 | O_RDWR | O_CLOEXEC); | |
743 | } | |
744 | ||
113214be | 745 | static struct bpf_prog *____bpf_prog_get(struct fd f) |
09756af4 | 746 | { |
09756af4 AS |
747 | if (!f.file) |
748 | return ERR_PTR(-EBADF); | |
09756af4 AS |
749 | if (f.file->f_op != &bpf_prog_fops) { |
750 | fdput(f); | |
751 | return ERR_PTR(-EINVAL); | |
752 | } | |
753 | ||
c2101297 | 754 | return f.file->private_data; |
09756af4 AS |
755 | } |
756 | ||
59d3656d | 757 | struct bpf_prog *bpf_prog_add(struct bpf_prog *prog, int i) |
92117d84 | 758 | { |
59d3656d BB |
759 | if (atomic_add_return(i, &prog->aux->refcnt) > BPF_MAX_REFCNT) { |
760 | atomic_sub(i, &prog->aux->refcnt); | |
92117d84 AS |
761 | return ERR_PTR(-EBUSY); |
762 | } | |
763 | return prog; | |
764 | } | |
59d3656d BB |
765 | EXPORT_SYMBOL_GPL(bpf_prog_add); |
766 | ||
c540594f DB |
767 | void bpf_prog_sub(struct bpf_prog *prog, int i) |
768 | { | |
769 | /* Only to be used for undoing previous bpf_prog_add() in some | |
770 | * error path. We still know that another entity in our call | |
771 | * path holds a reference to the program, thus atomic_sub() can | |
772 | * be safely used in such cases! | |
773 | */ | |
774 | WARN_ON(atomic_sub_return(i, &prog->aux->refcnt) == 0); | |
775 | } | |
776 | EXPORT_SYMBOL_GPL(bpf_prog_sub); | |
777 | ||
59d3656d BB |
778 | struct bpf_prog *bpf_prog_inc(struct bpf_prog *prog) |
779 | { | |
780 | return bpf_prog_add(prog, 1); | |
781 | } | |
97bc402d | 782 | EXPORT_SYMBOL_GPL(bpf_prog_inc); |
92117d84 | 783 | |
113214be | 784 | static struct bpf_prog *__bpf_prog_get(u32 ufd, enum bpf_prog_type *type) |
09756af4 AS |
785 | { |
786 | struct fd f = fdget(ufd); | |
787 | struct bpf_prog *prog; | |
788 | ||
113214be | 789 | prog = ____bpf_prog_get(f); |
09756af4 AS |
790 | if (IS_ERR(prog)) |
791 | return prog; | |
113214be DB |
792 | if (type && prog->type != *type) { |
793 | prog = ERR_PTR(-EINVAL); | |
794 | goto out; | |
795 | } | |
09756af4 | 796 | |
92117d84 | 797 | prog = bpf_prog_inc(prog); |
113214be | 798 | out: |
09756af4 AS |
799 | fdput(f); |
800 | return prog; | |
801 | } | |
113214be DB |
802 | |
803 | struct bpf_prog *bpf_prog_get(u32 ufd) | |
804 | { | |
805 | return __bpf_prog_get(ufd, NULL); | |
806 | } | |
807 | ||
808 | struct bpf_prog *bpf_prog_get_type(u32 ufd, enum bpf_prog_type type) | |
809 | { | |
810 | return __bpf_prog_get(ufd, &type); | |
811 | } | |
812 | EXPORT_SYMBOL_GPL(bpf_prog_get_type); | |
09756af4 AS |
813 | |
814 | /* last field in 'union bpf_attr' used by this command */ | |
2541517c | 815 | #define BPF_PROG_LOAD_LAST_FIELD kern_version |
09756af4 AS |
816 | |
817 | static int bpf_prog_load(union bpf_attr *attr) | |
818 | { | |
819 | enum bpf_prog_type type = attr->prog_type; | |
820 | struct bpf_prog *prog; | |
821 | int err; | |
822 | char license[128]; | |
823 | bool is_gpl; | |
824 | ||
825 | if (CHECK_ATTR(BPF_PROG_LOAD)) | |
826 | return -EINVAL; | |
827 | ||
828 | /* copy eBPF program license from user space */ | |
535e7b4b | 829 | if (strncpy_from_user(license, u64_to_user_ptr(attr->license), |
09756af4 AS |
830 | sizeof(license) - 1) < 0) |
831 | return -EFAULT; | |
832 | license[sizeof(license) - 1] = 0; | |
833 | ||
834 | /* eBPF programs must be GPL compatible to use GPL-ed functions */ | |
835 | is_gpl = license_is_gpl_compatible(license); | |
836 | ||
ef0915ca DB |
837 | if (attr->insn_cnt == 0 || attr->insn_cnt > BPF_MAXINSNS) |
838 | return -E2BIG; | |
09756af4 | 839 | |
2541517c AS |
840 | if (type == BPF_PROG_TYPE_KPROBE && |
841 | attr->kern_version != LINUX_VERSION_CODE) | |
842 | return -EINVAL; | |
843 | ||
1be7f75d AS |
844 | if (type != BPF_PROG_TYPE_SOCKET_FILTER && !capable(CAP_SYS_ADMIN)) |
845 | return -EPERM; | |
846 | ||
09756af4 AS |
847 | /* plain bpf_prog allocation */ |
848 | prog = bpf_prog_alloc(bpf_prog_size(attr->insn_cnt), GFP_USER); | |
849 | if (!prog) | |
850 | return -ENOMEM; | |
851 | ||
aaac3ba9 AS |
852 | err = bpf_prog_charge_memlock(prog); |
853 | if (err) | |
854 | goto free_prog_nouncharge; | |
855 | ||
09756af4 AS |
856 | prog->len = attr->insn_cnt; |
857 | ||
858 | err = -EFAULT; | |
535e7b4b | 859 | if (copy_from_user(prog->insns, u64_to_user_ptr(attr->insns), |
aafe6ae9 | 860 | bpf_prog_insn_size(prog)) != 0) |
09756af4 AS |
861 | goto free_prog; |
862 | ||
863 | prog->orig_prog = NULL; | |
a91263d5 | 864 | prog->jited = 0; |
09756af4 AS |
865 | |
866 | atomic_set(&prog->aux->refcnt, 1); | |
a91263d5 | 867 | prog->gpl_compatible = is_gpl ? 1 : 0; |
09756af4 AS |
868 | |
869 | /* find program type: socket_filter vs tracing_filter */ | |
870 | err = find_prog_type(type, prog); | |
871 | if (err < 0) | |
872 | goto free_prog; | |
873 | ||
874 | /* run eBPF verifier */ | |
9bac3d6d | 875 | err = bpf_check(&prog, attr); |
09756af4 AS |
876 | if (err < 0) |
877 | goto free_used_maps; | |
878 | ||
0a542a86 AS |
879 | /* fixup BPF_CALL->imm field */ |
880 | fixup_bpf_calls(prog); | |
881 | ||
09756af4 | 882 | /* eBPF program is ready to be JITed */ |
d1c55ab5 | 883 | prog = bpf_prog_select_runtime(prog, &err); |
04fd61ab AS |
884 | if (err < 0) |
885 | goto free_used_maps; | |
09756af4 | 886 | |
aa79781b | 887 | err = bpf_prog_new_fd(prog); |
09756af4 AS |
888 | if (err < 0) |
889 | /* failed to allocate fd */ | |
890 | goto free_used_maps; | |
891 | ||
892 | return err; | |
893 | ||
894 | free_used_maps: | |
895 | free_used_maps(prog->aux); | |
896 | free_prog: | |
aaac3ba9 AS |
897 | bpf_prog_uncharge_memlock(prog); |
898 | free_prog_nouncharge: | |
09756af4 AS |
899 | bpf_prog_free(prog); |
900 | return err; | |
901 | } | |
902 | ||
b2197755 DB |
903 | #define BPF_OBJ_LAST_FIELD bpf_fd |
904 | ||
905 | static int bpf_obj_pin(const union bpf_attr *attr) | |
906 | { | |
907 | if (CHECK_ATTR(BPF_OBJ)) | |
908 | return -EINVAL; | |
909 | ||
535e7b4b | 910 | return bpf_obj_pin_user(attr->bpf_fd, u64_to_user_ptr(attr->pathname)); |
b2197755 DB |
911 | } |
912 | ||
913 | static int bpf_obj_get(const union bpf_attr *attr) | |
914 | { | |
915 | if (CHECK_ATTR(BPF_OBJ) || attr->bpf_fd != 0) | |
916 | return -EINVAL; | |
917 | ||
535e7b4b | 918 | return bpf_obj_get_user(u64_to_user_ptr(attr->pathname)); |
b2197755 DB |
919 | } |
920 | ||
f4324551 DM |
921 | #ifdef CONFIG_CGROUP_BPF |
922 | ||
7f677633 | 923 | #define BPF_PROG_ATTACH_LAST_FIELD attach_flags |
f4324551 DM |
924 | |
925 | static int bpf_prog_attach(const union bpf_attr *attr) | |
926 | { | |
7f677633 | 927 | enum bpf_prog_type ptype; |
f4324551 DM |
928 | struct bpf_prog *prog; |
929 | struct cgroup *cgrp; | |
7f677633 | 930 | int ret; |
f4324551 DM |
931 | |
932 | if (!capable(CAP_NET_ADMIN)) | |
933 | return -EPERM; | |
934 | ||
935 | if (CHECK_ATTR(BPF_PROG_ATTACH)) | |
936 | return -EINVAL; | |
937 | ||
7f677633 AS |
938 | if (attr->attach_flags & ~BPF_F_ALLOW_OVERRIDE) |
939 | return -EINVAL; | |
940 | ||
f4324551 DM |
941 | switch (attr->attach_type) { |
942 | case BPF_CGROUP_INET_INGRESS: | |
943 | case BPF_CGROUP_INET_EGRESS: | |
b2cd1257 | 944 | ptype = BPF_PROG_TYPE_CGROUP_SKB; |
f4324551 | 945 | break; |
61023658 DA |
946 | case BPF_CGROUP_INET_SOCK_CREATE: |
947 | ptype = BPF_PROG_TYPE_CGROUP_SOCK; | |
948 | break; | |
f4324551 DM |
949 | default: |
950 | return -EINVAL; | |
951 | } | |
952 | ||
b2cd1257 DA |
953 | prog = bpf_prog_get_type(attr->attach_bpf_fd, ptype); |
954 | if (IS_ERR(prog)) | |
955 | return PTR_ERR(prog); | |
956 | ||
957 | cgrp = cgroup_get_from_fd(attr->target_fd); | |
958 | if (IS_ERR(cgrp)) { | |
959 | bpf_prog_put(prog); | |
960 | return PTR_ERR(cgrp); | |
961 | } | |
962 | ||
7f677633 AS |
963 | ret = cgroup_bpf_update(cgrp, prog, attr->attach_type, |
964 | attr->attach_flags & BPF_F_ALLOW_OVERRIDE); | |
965 | if (ret) | |
966 | bpf_prog_put(prog); | |
b2cd1257 DA |
967 | cgroup_put(cgrp); |
968 | ||
7f677633 | 969 | return ret; |
f4324551 DM |
970 | } |
971 | ||
972 | #define BPF_PROG_DETACH_LAST_FIELD attach_type | |
973 | ||
974 | static int bpf_prog_detach(const union bpf_attr *attr) | |
975 | { | |
976 | struct cgroup *cgrp; | |
7f677633 | 977 | int ret; |
f4324551 DM |
978 | |
979 | if (!capable(CAP_NET_ADMIN)) | |
980 | return -EPERM; | |
981 | ||
982 | if (CHECK_ATTR(BPF_PROG_DETACH)) | |
983 | return -EINVAL; | |
984 | ||
985 | switch (attr->attach_type) { | |
986 | case BPF_CGROUP_INET_INGRESS: | |
987 | case BPF_CGROUP_INET_EGRESS: | |
61023658 | 988 | case BPF_CGROUP_INET_SOCK_CREATE: |
f4324551 DM |
989 | cgrp = cgroup_get_from_fd(attr->target_fd); |
990 | if (IS_ERR(cgrp)) | |
991 | return PTR_ERR(cgrp); | |
992 | ||
7f677633 | 993 | ret = cgroup_bpf_update(cgrp, NULL, attr->attach_type, false); |
f4324551 DM |
994 | cgroup_put(cgrp); |
995 | break; | |
996 | ||
997 | default: | |
998 | return -EINVAL; | |
999 | } | |
1000 | ||
7f677633 | 1001 | return ret; |
f4324551 DM |
1002 | } |
1003 | #endif /* CONFIG_CGROUP_BPF */ | |
1004 | ||
99c55f7d AS |
1005 | SYSCALL_DEFINE3(bpf, int, cmd, union bpf_attr __user *, uattr, unsigned int, size) |
1006 | { | |
1007 | union bpf_attr attr = {}; | |
1008 | int err; | |
1009 | ||
1be7f75d | 1010 | if (!capable(CAP_SYS_ADMIN) && sysctl_unprivileged_bpf_disabled) |
99c55f7d AS |
1011 | return -EPERM; |
1012 | ||
1013 | if (!access_ok(VERIFY_READ, uattr, 1)) | |
1014 | return -EFAULT; | |
1015 | ||
1016 | if (size > PAGE_SIZE) /* silly large */ | |
1017 | return -E2BIG; | |
1018 | ||
1019 | /* If we're handed a bigger struct than we know of, | |
1020 | * ensure all the unknown bits are 0 - i.e. new | |
1021 | * user-space does not rely on any kernel feature | |
1022 | * extensions we dont know about yet. | |
1023 | */ | |
1024 | if (size > sizeof(attr)) { | |
1025 | unsigned char __user *addr; | |
1026 | unsigned char __user *end; | |
1027 | unsigned char val; | |
1028 | ||
1029 | addr = (void __user *)uattr + sizeof(attr); | |
1030 | end = (void __user *)uattr + size; | |
1031 | ||
1032 | for (; addr < end; addr++) { | |
1033 | err = get_user(val, addr); | |
1034 | if (err) | |
1035 | return err; | |
1036 | if (val) | |
1037 | return -E2BIG; | |
1038 | } | |
1039 | size = sizeof(attr); | |
1040 | } | |
1041 | ||
1042 | /* copy attributes from user space, may be less than sizeof(bpf_attr) */ | |
1043 | if (copy_from_user(&attr, uattr, size) != 0) | |
1044 | return -EFAULT; | |
1045 | ||
1046 | switch (cmd) { | |
1047 | case BPF_MAP_CREATE: | |
1048 | err = map_create(&attr); | |
1049 | break; | |
db20fd2b AS |
1050 | case BPF_MAP_LOOKUP_ELEM: |
1051 | err = map_lookup_elem(&attr); | |
1052 | break; | |
1053 | case BPF_MAP_UPDATE_ELEM: | |
1054 | err = map_update_elem(&attr); | |
1055 | break; | |
1056 | case BPF_MAP_DELETE_ELEM: | |
1057 | err = map_delete_elem(&attr); | |
1058 | break; | |
1059 | case BPF_MAP_GET_NEXT_KEY: | |
1060 | err = map_get_next_key(&attr); | |
1061 | break; | |
09756af4 AS |
1062 | case BPF_PROG_LOAD: |
1063 | err = bpf_prog_load(&attr); | |
1064 | break; | |
b2197755 DB |
1065 | case BPF_OBJ_PIN: |
1066 | err = bpf_obj_pin(&attr); | |
1067 | break; | |
1068 | case BPF_OBJ_GET: | |
1069 | err = bpf_obj_get(&attr); | |
1070 | break; | |
f4324551 DM |
1071 | |
1072 | #ifdef CONFIG_CGROUP_BPF | |
1073 | case BPF_PROG_ATTACH: | |
1074 | err = bpf_prog_attach(&attr); | |
1075 | break; | |
1076 | case BPF_PROG_DETACH: | |
1077 | err = bpf_prog_detach(&attr); | |
1078 | break; | |
1079 | #endif | |
1080 | ||
99c55f7d AS |
1081 | default: |
1082 | err = -EINVAL; | |
1083 | break; | |
1084 | } | |
1085 | ||
1086 | return err; | |
1087 | } |