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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> | |
3f07c014 | 16 | #include <linux/sched/signal.h> |
d407bd25 DB |
17 | #include <linux/vmalloc.h> |
18 | #include <linux/mmzone.h> | |
99c55f7d | 19 | #include <linux/anon_inodes.h> |
db20fd2b | 20 | #include <linux/file.h> |
09756af4 AS |
21 | #include <linux/license.h> |
22 | #include <linux/filter.h> | |
2541517c | 23 | #include <linux/version.h> |
535e7b4b | 24 | #include <linux/kernel.h> |
dc4bb0e2 | 25 | #include <linux/idr.h> |
cb4d2b3f MKL |
26 | #include <linux/cred.h> |
27 | #include <linux/timekeeping.h> | |
28 | #include <linux/ctype.h> | |
99c55f7d | 29 | |
14dc6f04 MKL |
30 | #define IS_FD_ARRAY(map) ((map)->map_type == BPF_MAP_TYPE_PROG_ARRAY || \ |
31 | (map)->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY || \ | |
32 | (map)->map_type == BPF_MAP_TYPE_CGROUP_ARRAY || \ | |
33 | (map)->map_type == BPF_MAP_TYPE_ARRAY_OF_MAPS) | |
34 | #define IS_FD_HASH(map) ((map)->map_type == BPF_MAP_TYPE_HASH_OF_MAPS) | |
35 | #define IS_FD_MAP(map) (IS_FD_ARRAY(map) || IS_FD_HASH(map)) | |
36 | ||
b121d1e7 | 37 | DEFINE_PER_CPU(int, bpf_prog_active); |
dc4bb0e2 MKL |
38 | static DEFINE_IDR(prog_idr); |
39 | static DEFINE_SPINLOCK(prog_idr_lock); | |
f3f1c054 MKL |
40 | static DEFINE_IDR(map_idr); |
41 | static DEFINE_SPINLOCK(map_idr_lock); | |
b121d1e7 | 42 | |
1be7f75d AS |
43 | int sysctl_unprivileged_bpf_disabled __read_mostly; |
44 | ||
40077e0c JB |
45 | static const struct bpf_map_ops * const bpf_map_types[] = { |
46 | #define BPF_PROG_TYPE(_id, _ops) | |
47 | #define BPF_MAP_TYPE(_id, _ops) \ | |
48 | [_id] = &_ops, | |
49 | #include <linux/bpf_types.h> | |
50 | #undef BPF_PROG_TYPE | |
51 | #undef BPF_MAP_TYPE | |
52 | }; | |
99c55f7d | 53 | |
752ba56f MS |
54 | /* |
55 | * If we're handed a bigger struct than we know of, ensure all the unknown bits | |
56 | * are 0 - i.e. new user-space does not rely on any kernel feature extensions | |
57 | * we don't know about yet. | |
58 | * | |
59 | * There is a ToCToU between this function call and the following | |
60 | * copy_from_user() call. However, this is not a concern since this function is | |
61 | * meant to be a future-proofing of bits. | |
62 | */ | |
58291a74 MS |
63 | static int check_uarg_tail_zero(void __user *uaddr, |
64 | size_t expected_size, | |
65 | size_t actual_size) | |
66 | { | |
67 | unsigned char __user *addr; | |
68 | unsigned char __user *end; | |
69 | unsigned char val; | |
70 | int err; | |
71 | ||
752ba56f MS |
72 | if (unlikely(actual_size > PAGE_SIZE)) /* silly large */ |
73 | return -E2BIG; | |
74 | ||
75 | if (unlikely(!access_ok(VERIFY_READ, uaddr, actual_size))) | |
76 | return -EFAULT; | |
77 | ||
58291a74 MS |
78 | if (actual_size <= expected_size) |
79 | return 0; | |
80 | ||
81 | addr = uaddr + expected_size; | |
82 | end = uaddr + actual_size; | |
83 | ||
84 | for (; addr < end; addr++) { | |
85 | err = get_user(val, addr); | |
86 | if (err) | |
87 | return err; | |
88 | if (val) | |
89 | return -E2BIG; | |
90 | } | |
91 | ||
92 | return 0; | |
93 | } | |
94 | ||
99c55f7d AS |
95 | static struct bpf_map *find_and_alloc_map(union bpf_attr *attr) |
96 | { | |
99c55f7d AS |
97 | struct bpf_map *map; |
98 | ||
40077e0c JB |
99 | if (attr->map_type >= ARRAY_SIZE(bpf_map_types) || |
100 | !bpf_map_types[attr->map_type]) | |
101 | return ERR_PTR(-EINVAL); | |
99c55f7d | 102 | |
40077e0c JB |
103 | map = bpf_map_types[attr->map_type]->map_alloc(attr); |
104 | if (IS_ERR(map)) | |
105 | return map; | |
106 | map->ops = bpf_map_types[attr->map_type]; | |
107 | map->map_type = attr->map_type; | |
108 | return map; | |
99c55f7d AS |
109 | } |
110 | ||
96eabe7a | 111 | void *bpf_map_area_alloc(size_t size, int numa_node) |
d407bd25 DB |
112 | { |
113 | /* We definitely need __GFP_NORETRY, so OOM killer doesn't | |
114 | * trigger under memory pressure as we really just want to | |
115 | * fail instead. | |
116 | */ | |
117 | const gfp_t flags = __GFP_NOWARN | __GFP_NORETRY | __GFP_ZERO; | |
118 | void *area; | |
119 | ||
120 | if (size <= (PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER)) { | |
96eabe7a | 121 | area = kmalloc_node(size, GFP_USER | flags, numa_node); |
d407bd25 DB |
122 | if (area != NULL) |
123 | return area; | |
124 | } | |
125 | ||
96eabe7a MKL |
126 | return __vmalloc_node_flags_caller(size, numa_node, GFP_KERNEL | flags, |
127 | __builtin_return_address(0)); | |
d407bd25 DB |
128 | } |
129 | ||
130 | void bpf_map_area_free(void *area) | |
131 | { | |
132 | kvfree(area); | |
133 | } | |
134 | ||
6c905981 AS |
135 | int bpf_map_precharge_memlock(u32 pages) |
136 | { | |
137 | struct user_struct *user = get_current_user(); | |
138 | unsigned long memlock_limit, cur; | |
139 | ||
140 | memlock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
141 | cur = atomic_long_read(&user->locked_vm); | |
142 | free_uid(user); | |
143 | if (cur + pages > memlock_limit) | |
144 | return -EPERM; | |
145 | return 0; | |
146 | } | |
147 | ||
aaac3ba9 AS |
148 | static int bpf_map_charge_memlock(struct bpf_map *map) |
149 | { | |
150 | struct user_struct *user = get_current_user(); | |
151 | unsigned long memlock_limit; | |
152 | ||
153 | memlock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
154 | ||
155 | atomic_long_add(map->pages, &user->locked_vm); | |
156 | ||
157 | if (atomic_long_read(&user->locked_vm) > memlock_limit) { | |
158 | atomic_long_sub(map->pages, &user->locked_vm); | |
159 | free_uid(user); | |
160 | return -EPERM; | |
161 | } | |
162 | map->user = user; | |
163 | return 0; | |
164 | } | |
165 | ||
166 | static void bpf_map_uncharge_memlock(struct bpf_map *map) | |
167 | { | |
168 | struct user_struct *user = map->user; | |
169 | ||
170 | atomic_long_sub(map->pages, &user->locked_vm); | |
171 | free_uid(user); | |
172 | } | |
173 | ||
f3f1c054 MKL |
174 | static int bpf_map_alloc_id(struct bpf_map *map) |
175 | { | |
176 | int id; | |
177 | ||
178 | spin_lock_bh(&map_idr_lock); | |
179 | id = idr_alloc_cyclic(&map_idr, map, 1, INT_MAX, GFP_ATOMIC); | |
180 | if (id > 0) | |
181 | map->id = id; | |
182 | spin_unlock_bh(&map_idr_lock); | |
183 | ||
184 | if (WARN_ON_ONCE(!id)) | |
185 | return -ENOSPC; | |
186 | ||
187 | return id > 0 ? 0 : id; | |
188 | } | |
189 | ||
bd5f5f4e | 190 | static void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock) |
f3f1c054 | 191 | { |
930651a7 ED |
192 | unsigned long flags; |
193 | ||
bd5f5f4e | 194 | if (do_idr_lock) |
930651a7 | 195 | spin_lock_irqsave(&map_idr_lock, flags); |
bd5f5f4e MKL |
196 | else |
197 | __acquire(&map_idr_lock); | |
198 | ||
f3f1c054 | 199 | idr_remove(&map_idr, map->id); |
bd5f5f4e MKL |
200 | |
201 | if (do_idr_lock) | |
930651a7 | 202 | spin_unlock_irqrestore(&map_idr_lock, flags); |
bd5f5f4e MKL |
203 | else |
204 | __release(&map_idr_lock); | |
f3f1c054 MKL |
205 | } |
206 | ||
99c55f7d AS |
207 | /* called from workqueue */ |
208 | static void bpf_map_free_deferred(struct work_struct *work) | |
209 | { | |
210 | struct bpf_map *map = container_of(work, struct bpf_map, work); | |
211 | ||
aaac3ba9 | 212 | bpf_map_uncharge_memlock(map); |
99c55f7d AS |
213 | /* implementation dependent freeing */ |
214 | map->ops->map_free(map); | |
215 | } | |
216 | ||
c9da161c DB |
217 | static void bpf_map_put_uref(struct bpf_map *map) |
218 | { | |
219 | if (atomic_dec_and_test(&map->usercnt)) { | |
220 | if (map->map_type == BPF_MAP_TYPE_PROG_ARRAY) | |
221 | bpf_fd_array_map_clear(map); | |
222 | } | |
223 | } | |
224 | ||
99c55f7d AS |
225 | /* decrement map refcnt and schedule it for freeing via workqueue |
226 | * (unrelying map implementation ops->map_free() might sleep) | |
227 | */ | |
bd5f5f4e | 228 | static void __bpf_map_put(struct bpf_map *map, bool do_idr_lock) |
99c55f7d AS |
229 | { |
230 | if (atomic_dec_and_test(&map->refcnt)) { | |
34ad5580 | 231 | /* bpf_map_free_id() must be called first */ |
bd5f5f4e | 232 | bpf_map_free_id(map, do_idr_lock); |
99c55f7d AS |
233 | INIT_WORK(&map->work, bpf_map_free_deferred); |
234 | schedule_work(&map->work); | |
235 | } | |
236 | } | |
237 | ||
bd5f5f4e MKL |
238 | void bpf_map_put(struct bpf_map *map) |
239 | { | |
240 | __bpf_map_put(map, true); | |
241 | } | |
242 | ||
c9da161c | 243 | void bpf_map_put_with_uref(struct bpf_map *map) |
99c55f7d | 244 | { |
c9da161c | 245 | bpf_map_put_uref(map); |
99c55f7d | 246 | bpf_map_put(map); |
c9da161c DB |
247 | } |
248 | ||
249 | static int bpf_map_release(struct inode *inode, struct file *filp) | |
250 | { | |
61d1b6a4 DB |
251 | struct bpf_map *map = filp->private_data; |
252 | ||
253 | if (map->ops->map_release) | |
254 | map->ops->map_release(map, filp); | |
255 | ||
256 | bpf_map_put_with_uref(map); | |
99c55f7d AS |
257 | return 0; |
258 | } | |
259 | ||
f99bf205 DB |
260 | #ifdef CONFIG_PROC_FS |
261 | static void bpf_map_show_fdinfo(struct seq_file *m, struct file *filp) | |
262 | { | |
263 | const struct bpf_map *map = filp->private_data; | |
21116b70 DB |
264 | const struct bpf_array *array; |
265 | u32 owner_prog_type = 0; | |
9780c0ab | 266 | u32 owner_jited = 0; |
21116b70 DB |
267 | |
268 | if (map->map_type == BPF_MAP_TYPE_PROG_ARRAY) { | |
269 | array = container_of(map, struct bpf_array, map); | |
270 | owner_prog_type = array->owner_prog_type; | |
9780c0ab | 271 | owner_jited = array->owner_jited; |
21116b70 | 272 | } |
f99bf205 DB |
273 | |
274 | seq_printf(m, | |
275 | "map_type:\t%u\n" | |
276 | "key_size:\t%u\n" | |
277 | "value_size:\t%u\n" | |
322cea2f | 278 | "max_entries:\t%u\n" |
21116b70 DB |
279 | "map_flags:\t%#x\n" |
280 | "memlock:\t%llu\n", | |
f99bf205 DB |
281 | map->map_type, |
282 | map->key_size, | |
283 | map->value_size, | |
322cea2f | 284 | map->max_entries, |
21116b70 DB |
285 | map->map_flags, |
286 | map->pages * 1ULL << PAGE_SHIFT); | |
287 | ||
9780c0ab | 288 | if (owner_prog_type) { |
21116b70 DB |
289 | seq_printf(m, "owner_prog_type:\t%u\n", |
290 | owner_prog_type); | |
9780c0ab DB |
291 | seq_printf(m, "owner_jited:\t%u\n", |
292 | owner_jited); | |
293 | } | |
f99bf205 DB |
294 | } |
295 | #endif | |
296 | ||
99c55f7d | 297 | static const struct file_operations bpf_map_fops = { |
f99bf205 DB |
298 | #ifdef CONFIG_PROC_FS |
299 | .show_fdinfo = bpf_map_show_fdinfo, | |
300 | #endif | |
301 | .release = bpf_map_release, | |
99c55f7d AS |
302 | }; |
303 | ||
b2197755 | 304 | int bpf_map_new_fd(struct bpf_map *map) |
aa79781b DB |
305 | { |
306 | return anon_inode_getfd("bpf-map", &bpf_map_fops, map, | |
307 | O_RDWR | O_CLOEXEC); | |
308 | } | |
309 | ||
99c55f7d AS |
310 | /* helper macro to check that unused fields 'union bpf_attr' are zero */ |
311 | #define CHECK_ATTR(CMD) \ | |
312 | memchr_inv((void *) &attr->CMD##_LAST_FIELD + \ | |
313 | sizeof(attr->CMD##_LAST_FIELD), 0, \ | |
314 | sizeof(*attr) - \ | |
315 | offsetof(union bpf_attr, CMD##_LAST_FIELD) - \ | |
316 | sizeof(attr->CMD##_LAST_FIELD)) != NULL | |
317 | ||
cb4d2b3f MKL |
318 | /* dst and src must have at least BPF_OBJ_NAME_LEN number of bytes. |
319 | * Return 0 on success and < 0 on error. | |
320 | */ | |
321 | static int bpf_obj_name_cpy(char *dst, const char *src) | |
322 | { | |
323 | const char *end = src + BPF_OBJ_NAME_LEN; | |
324 | ||
473d9734 MKL |
325 | memset(dst, 0, BPF_OBJ_NAME_LEN); |
326 | ||
cb4d2b3f MKL |
327 | /* Copy all isalnum() and '_' char */ |
328 | while (src < end && *src) { | |
329 | if (!isalnum(*src) && *src != '_') | |
330 | return -EINVAL; | |
331 | *dst++ = *src++; | |
332 | } | |
333 | ||
334 | /* No '\0' found in BPF_OBJ_NAME_LEN number of bytes */ | |
335 | if (src == end) | |
336 | return -EINVAL; | |
337 | ||
cb4d2b3f MKL |
338 | return 0; |
339 | } | |
340 | ||
ad5b177b | 341 | #define BPF_MAP_CREATE_LAST_FIELD map_name |
99c55f7d AS |
342 | /* called via syscall */ |
343 | static int map_create(union bpf_attr *attr) | |
344 | { | |
96eabe7a | 345 | int numa_node = bpf_map_attr_numa_node(attr); |
99c55f7d AS |
346 | struct bpf_map *map; |
347 | int err; | |
348 | ||
349 | err = CHECK_ATTR(BPF_MAP_CREATE); | |
350 | if (err) | |
351 | return -EINVAL; | |
352 | ||
96eabe7a | 353 | if (numa_node != NUMA_NO_NODE && |
96e5ae4e ED |
354 | ((unsigned int)numa_node >= nr_node_ids || |
355 | !node_online(numa_node))) | |
96eabe7a MKL |
356 | return -EINVAL; |
357 | ||
99c55f7d AS |
358 | /* find map type and init map: hashtable vs rbtree vs bloom vs ... */ |
359 | map = find_and_alloc_map(attr); | |
360 | if (IS_ERR(map)) | |
361 | return PTR_ERR(map); | |
362 | ||
ad5b177b MKL |
363 | err = bpf_obj_name_cpy(map->name, attr->map_name); |
364 | if (err) | |
365 | goto free_map_nouncharge; | |
366 | ||
99c55f7d | 367 | atomic_set(&map->refcnt, 1); |
c9da161c | 368 | atomic_set(&map->usercnt, 1); |
99c55f7d | 369 | |
aaac3ba9 AS |
370 | err = bpf_map_charge_memlock(map); |
371 | if (err) | |
20b2b24f | 372 | goto free_map_nouncharge; |
aaac3ba9 | 373 | |
f3f1c054 MKL |
374 | err = bpf_map_alloc_id(map); |
375 | if (err) | |
376 | goto free_map; | |
377 | ||
aa79781b | 378 | err = bpf_map_new_fd(map); |
bd5f5f4e MKL |
379 | if (err < 0) { |
380 | /* failed to allocate fd. | |
381 | * bpf_map_put() is needed because the above | |
382 | * bpf_map_alloc_id() has published the map | |
383 | * to the userspace and the userspace may | |
384 | * have refcnt-ed it through BPF_MAP_GET_FD_BY_ID. | |
385 | */ | |
386 | bpf_map_put(map); | |
387 | return err; | |
388 | } | |
99c55f7d | 389 | |
a67edbf4 | 390 | trace_bpf_map_create(map, err); |
99c55f7d AS |
391 | return err; |
392 | ||
393 | free_map: | |
20b2b24f DB |
394 | bpf_map_uncharge_memlock(map); |
395 | free_map_nouncharge: | |
99c55f7d AS |
396 | map->ops->map_free(map); |
397 | return err; | |
398 | } | |
399 | ||
db20fd2b AS |
400 | /* if error is returned, fd is released. |
401 | * On success caller should complete fd access with matching fdput() | |
402 | */ | |
c2101297 | 403 | struct bpf_map *__bpf_map_get(struct fd f) |
db20fd2b | 404 | { |
db20fd2b AS |
405 | if (!f.file) |
406 | return ERR_PTR(-EBADF); | |
db20fd2b AS |
407 | if (f.file->f_op != &bpf_map_fops) { |
408 | fdput(f); | |
409 | return ERR_PTR(-EINVAL); | |
410 | } | |
411 | ||
c2101297 DB |
412 | return f.file->private_data; |
413 | } | |
414 | ||
92117d84 AS |
415 | /* prog's and map's refcnt limit */ |
416 | #define BPF_MAX_REFCNT 32768 | |
417 | ||
418 | struct bpf_map *bpf_map_inc(struct bpf_map *map, bool uref) | |
c9da161c | 419 | { |
92117d84 AS |
420 | if (atomic_inc_return(&map->refcnt) > BPF_MAX_REFCNT) { |
421 | atomic_dec(&map->refcnt); | |
422 | return ERR_PTR(-EBUSY); | |
423 | } | |
c9da161c DB |
424 | if (uref) |
425 | atomic_inc(&map->usercnt); | |
92117d84 | 426 | return map; |
c9da161c DB |
427 | } |
428 | ||
429 | struct bpf_map *bpf_map_get_with_uref(u32 ufd) | |
c2101297 DB |
430 | { |
431 | struct fd f = fdget(ufd); | |
432 | struct bpf_map *map; | |
433 | ||
434 | map = __bpf_map_get(f); | |
435 | if (IS_ERR(map)) | |
436 | return map; | |
437 | ||
92117d84 | 438 | map = bpf_map_inc(map, true); |
c2101297 | 439 | fdput(f); |
db20fd2b AS |
440 | |
441 | return map; | |
442 | } | |
443 | ||
bd5f5f4e MKL |
444 | /* map_idr_lock should have been held */ |
445 | static struct bpf_map *bpf_map_inc_not_zero(struct bpf_map *map, | |
446 | bool uref) | |
447 | { | |
448 | int refold; | |
449 | ||
450 | refold = __atomic_add_unless(&map->refcnt, 1, 0); | |
451 | ||
452 | if (refold >= BPF_MAX_REFCNT) { | |
453 | __bpf_map_put(map, false); | |
454 | return ERR_PTR(-EBUSY); | |
455 | } | |
456 | ||
457 | if (!refold) | |
458 | return ERR_PTR(-ENOENT); | |
459 | ||
460 | if (uref) | |
461 | atomic_inc(&map->usercnt); | |
462 | ||
463 | return map; | |
464 | } | |
465 | ||
b8cdc051 AS |
466 | int __weak bpf_stackmap_copy(struct bpf_map *map, void *key, void *value) |
467 | { | |
468 | return -ENOTSUPP; | |
469 | } | |
470 | ||
db20fd2b AS |
471 | /* last field in 'union bpf_attr' used by this command */ |
472 | #define BPF_MAP_LOOKUP_ELEM_LAST_FIELD value | |
473 | ||
474 | static int map_lookup_elem(union bpf_attr *attr) | |
475 | { | |
535e7b4b MS |
476 | void __user *ukey = u64_to_user_ptr(attr->key); |
477 | void __user *uvalue = u64_to_user_ptr(attr->value); | |
db20fd2b | 478 | int ufd = attr->map_fd; |
db20fd2b | 479 | struct bpf_map *map; |
8ebe667c | 480 | void *key, *value, *ptr; |
15a07b33 | 481 | u32 value_size; |
592867bf | 482 | struct fd f; |
db20fd2b AS |
483 | int err; |
484 | ||
485 | if (CHECK_ATTR(BPF_MAP_LOOKUP_ELEM)) | |
486 | return -EINVAL; | |
487 | ||
592867bf | 488 | f = fdget(ufd); |
c2101297 | 489 | map = __bpf_map_get(f); |
db20fd2b AS |
490 | if (IS_ERR(map)) |
491 | return PTR_ERR(map); | |
492 | ||
e4448ed8 AV |
493 | key = memdup_user(ukey, map->key_size); |
494 | if (IS_ERR(key)) { | |
495 | err = PTR_ERR(key); | |
db20fd2b | 496 | goto err_put; |
e4448ed8 | 497 | } |
db20fd2b | 498 | |
15a07b33 | 499 | if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH || |
8f844938 | 500 | map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH || |
15a07b33 AS |
501 | map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY) |
502 | value_size = round_up(map->value_size, 8) * num_possible_cpus(); | |
14dc6f04 MKL |
503 | else if (IS_FD_MAP(map)) |
504 | value_size = sizeof(u32); | |
15a07b33 AS |
505 | else |
506 | value_size = map->value_size; | |
507 | ||
8ebe667c | 508 | err = -ENOMEM; |
15a07b33 | 509 | value = kmalloc(value_size, GFP_USER | __GFP_NOWARN); |
db20fd2b | 510 | if (!value) |
8ebe667c AS |
511 | goto free_key; |
512 | ||
8f844938 MKL |
513 | if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH || |
514 | map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH) { | |
15a07b33 AS |
515 | err = bpf_percpu_hash_copy(map, key, value); |
516 | } else if (map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY) { | |
517 | err = bpf_percpu_array_copy(map, key, value); | |
557c0c6e AS |
518 | } else if (map->map_type == BPF_MAP_TYPE_STACK_TRACE) { |
519 | err = bpf_stackmap_copy(map, key, value); | |
14dc6f04 MKL |
520 | } else if (IS_FD_ARRAY(map)) { |
521 | err = bpf_fd_array_map_lookup_elem(map, key, value); | |
522 | } else if (IS_FD_HASH(map)) { | |
523 | err = bpf_fd_htab_map_lookup_elem(map, key, value); | |
15a07b33 AS |
524 | } else { |
525 | rcu_read_lock(); | |
526 | ptr = map->ops->map_lookup_elem(map, key); | |
527 | if (ptr) | |
528 | memcpy(value, ptr, value_size); | |
529 | rcu_read_unlock(); | |
530 | err = ptr ? 0 : -ENOENT; | |
531 | } | |
8ebe667c | 532 | |
15a07b33 | 533 | if (err) |
8ebe667c | 534 | goto free_value; |
db20fd2b AS |
535 | |
536 | err = -EFAULT; | |
15a07b33 | 537 | if (copy_to_user(uvalue, value, value_size) != 0) |
8ebe667c | 538 | goto free_value; |
db20fd2b | 539 | |
a67edbf4 | 540 | trace_bpf_map_lookup_elem(map, ufd, key, value); |
db20fd2b AS |
541 | err = 0; |
542 | ||
8ebe667c AS |
543 | free_value: |
544 | kfree(value); | |
db20fd2b AS |
545 | free_key: |
546 | kfree(key); | |
547 | err_put: | |
548 | fdput(f); | |
549 | return err; | |
550 | } | |
551 | ||
3274f520 | 552 | #define BPF_MAP_UPDATE_ELEM_LAST_FIELD flags |
db20fd2b AS |
553 | |
554 | static int map_update_elem(union bpf_attr *attr) | |
555 | { | |
535e7b4b MS |
556 | void __user *ukey = u64_to_user_ptr(attr->key); |
557 | void __user *uvalue = u64_to_user_ptr(attr->value); | |
db20fd2b | 558 | int ufd = attr->map_fd; |
db20fd2b AS |
559 | struct bpf_map *map; |
560 | void *key, *value; | |
15a07b33 | 561 | u32 value_size; |
592867bf | 562 | struct fd f; |
db20fd2b AS |
563 | int err; |
564 | ||
565 | if (CHECK_ATTR(BPF_MAP_UPDATE_ELEM)) | |
566 | return -EINVAL; | |
567 | ||
592867bf | 568 | f = fdget(ufd); |
c2101297 | 569 | map = __bpf_map_get(f); |
db20fd2b AS |
570 | if (IS_ERR(map)) |
571 | return PTR_ERR(map); | |
572 | ||
e4448ed8 AV |
573 | key = memdup_user(ukey, map->key_size); |
574 | if (IS_ERR(key)) { | |
575 | err = PTR_ERR(key); | |
db20fd2b | 576 | goto err_put; |
e4448ed8 | 577 | } |
db20fd2b | 578 | |
15a07b33 | 579 | if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH || |
8f844938 | 580 | map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH || |
15a07b33 AS |
581 | map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY) |
582 | value_size = round_up(map->value_size, 8) * num_possible_cpus(); | |
583 | else | |
584 | value_size = map->value_size; | |
585 | ||
db20fd2b | 586 | err = -ENOMEM; |
15a07b33 | 587 | value = kmalloc(value_size, GFP_USER | __GFP_NOWARN); |
db20fd2b AS |
588 | if (!value) |
589 | goto free_key; | |
590 | ||
591 | err = -EFAULT; | |
15a07b33 | 592 | if (copy_from_user(value, uvalue, value_size) != 0) |
db20fd2b AS |
593 | goto free_value; |
594 | ||
b121d1e7 AS |
595 | /* must increment bpf_prog_active to avoid kprobe+bpf triggering from |
596 | * inside bpf map update or delete otherwise deadlocks are possible | |
597 | */ | |
598 | preempt_disable(); | |
599 | __this_cpu_inc(bpf_prog_active); | |
8f844938 MKL |
600 | if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH || |
601 | map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH) { | |
15a07b33 AS |
602 | err = bpf_percpu_hash_update(map, key, value, attr->flags); |
603 | } else if (map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY) { | |
604 | err = bpf_percpu_array_update(map, key, value, attr->flags); | |
d056a788 | 605 | } else if (map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY || |
4ed8ec52 | 606 | map->map_type == BPF_MAP_TYPE_PROG_ARRAY || |
56f668df MKL |
607 | map->map_type == BPF_MAP_TYPE_CGROUP_ARRAY || |
608 | map->map_type == BPF_MAP_TYPE_ARRAY_OF_MAPS) { | |
d056a788 DB |
609 | rcu_read_lock(); |
610 | err = bpf_fd_array_map_update_elem(map, f.file, key, value, | |
611 | attr->flags); | |
612 | rcu_read_unlock(); | |
bcc6b1b7 MKL |
613 | } else if (map->map_type == BPF_MAP_TYPE_HASH_OF_MAPS) { |
614 | rcu_read_lock(); | |
615 | err = bpf_fd_htab_map_update_elem(map, f.file, key, value, | |
616 | attr->flags); | |
617 | rcu_read_unlock(); | |
15a07b33 AS |
618 | } else { |
619 | rcu_read_lock(); | |
620 | err = map->ops->map_update_elem(map, key, value, attr->flags); | |
621 | rcu_read_unlock(); | |
622 | } | |
b121d1e7 AS |
623 | __this_cpu_dec(bpf_prog_active); |
624 | preempt_enable(); | |
db20fd2b | 625 | |
a67edbf4 DB |
626 | if (!err) |
627 | trace_bpf_map_update_elem(map, ufd, key, value); | |
db20fd2b AS |
628 | free_value: |
629 | kfree(value); | |
630 | free_key: | |
631 | kfree(key); | |
632 | err_put: | |
633 | fdput(f); | |
634 | return err; | |
635 | } | |
636 | ||
637 | #define BPF_MAP_DELETE_ELEM_LAST_FIELD key | |
638 | ||
639 | static int map_delete_elem(union bpf_attr *attr) | |
640 | { | |
535e7b4b | 641 | void __user *ukey = u64_to_user_ptr(attr->key); |
db20fd2b | 642 | int ufd = attr->map_fd; |
db20fd2b | 643 | struct bpf_map *map; |
592867bf | 644 | struct fd f; |
db20fd2b AS |
645 | void *key; |
646 | int err; | |
647 | ||
648 | if (CHECK_ATTR(BPF_MAP_DELETE_ELEM)) | |
649 | return -EINVAL; | |
650 | ||
592867bf | 651 | f = fdget(ufd); |
c2101297 | 652 | map = __bpf_map_get(f); |
db20fd2b AS |
653 | if (IS_ERR(map)) |
654 | return PTR_ERR(map); | |
655 | ||
e4448ed8 AV |
656 | key = memdup_user(ukey, map->key_size); |
657 | if (IS_ERR(key)) { | |
658 | err = PTR_ERR(key); | |
db20fd2b | 659 | goto err_put; |
e4448ed8 | 660 | } |
db20fd2b | 661 | |
b121d1e7 AS |
662 | preempt_disable(); |
663 | __this_cpu_inc(bpf_prog_active); | |
db20fd2b AS |
664 | rcu_read_lock(); |
665 | err = map->ops->map_delete_elem(map, key); | |
666 | rcu_read_unlock(); | |
b121d1e7 AS |
667 | __this_cpu_dec(bpf_prog_active); |
668 | preempt_enable(); | |
db20fd2b | 669 | |
a67edbf4 DB |
670 | if (!err) |
671 | trace_bpf_map_delete_elem(map, ufd, key); | |
db20fd2b AS |
672 | kfree(key); |
673 | err_put: | |
674 | fdput(f); | |
675 | return err; | |
676 | } | |
677 | ||
678 | /* last field in 'union bpf_attr' used by this command */ | |
679 | #define BPF_MAP_GET_NEXT_KEY_LAST_FIELD next_key | |
680 | ||
681 | static int map_get_next_key(union bpf_attr *attr) | |
682 | { | |
535e7b4b MS |
683 | void __user *ukey = u64_to_user_ptr(attr->key); |
684 | void __user *unext_key = u64_to_user_ptr(attr->next_key); | |
db20fd2b | 685 | int ufd = attr->map_fd; |
db20fd2b AS |
686 | struct bpf_map *map; |
687 | void *key, *next_key; | |
592867bf | 688 | struct fd f; |
db20fd2b AS |
689 | int err; |
690 | ||
691 | if (CHECK_ATTR(BPF_MAP_GET_NEXT_KEY)) | |
692 | return -EINVAL; | |
693 | ||
592867bf | 694 | f = fdget(ufd); |
c2101297 | 695 | map = __bpf_map_get(f); |
db20fd2b AS |
696 | if (IS_ERR(map)) |
697 | return PTR_ERR(map); | |
698 | ||
8fe45924 | 699 | if (ukey) { |
e4448ed8 AV |
700 | key = memdup_user(ukey, map->key_size); |
701 | if (IS_ERR(key)) { | |
702 | err = PTR_ERR(key); | |
8fe45924 | 703 | goto err_put; |
e4448ed8 | 704 | } |
8fe45924 TQ |
705 | } else { |
706 | key = NULL; | |
707 | } | |
db20fd2b AS |
708 | |
709 | err = -ENOMEM; | |
710 | next_key = kmalloc(map->key_size, GFP_USER); | |
711 | if (!next_key) | |
712 | goto free_key; | |
713 | ||
714 | rcu_read_lock(); | |
715 | err = map->ops->map_get_next_key(map, key, next_key); | |
716 | rcu_read_unlock(); | |
717 | if (err) | |
718 | goto free_next_key; | |
719 | ||
720 | err = -EFAULT; | |
721 | if (copy_to_user(unext_key, next_key, map->key_size) != 0) | |
722 | goto free_next_key; | |
723 | ||
a67edbf4 | 724 | trace_bpf_map_next_key(map, ufd, key, next_key); |
db20fd2b AS |
725 | err = 0; |
726 | ||
727 | free_next_key: | |
728 | kfree(next_key); | |
729 | free_key: | |
730 | kfree(key); | |
731 | err_put: | |
732 | fdput(f); | |
733 | return err; | |
734 | } | |
735 | ||
be9370a7 JB |
736 | static const struct bpf_verifier_ops * const bpf_prog_types[] = { |
737 | #define BPF_PROG_TYPE(_id, _ops) \ | |
738 | [_id] = &_ops, | |
40077e0c | 739 | #define BPF_MAP_TYPE(_id, _ops) |
be9370a7 JB |
740 | #include <linux/bpf_types.h> |
741 | #undef BPF_PROG_TYPE | |
40077e0c | 742 | #undef BPF_MAP_TYPE |
be9370a7 | 743 | }; |
09756af4 AS |
744 | |
745 | static int find_prog_type(enum bpf_prog_type type, struct bpf_prog *prog) | |
746 | { | |
be9370a7 JB |
747 | if (type >= ARRAY_SIZE(bpf_prog_types) || !bpf_prog_types[type]) |
748 | return -EINVAL; | |
09756af4 | 749 | |
be9370a7 JB |
750 | prog->aux->ops = bpf_prog_types[type]; |
751 | prog->type = type; | |
752 | return 0; | |
09756af4 AS |
753 | } |
754 | ||
755 | /* drop refcnt on maps used by eBPF program and free auxilary data */ | |
756 | static void free_used_maps(struct bpf_prog_aux *aux) | |
757 | { | |
758 | int i; | |
759 | ||
760 | for (i = 0; i < aux->used_map_cnt; i++) | |
761 | bpf_map_put(aux->used_maps[i]); | |
762 | ||
763 | kfree(aux->used_maps); | |
764 | } | |
765 | ||
5ccb071e DB |
766 | int __bpf_prog_charge(struct user_struct *user, u32 pages) |
767 | { | |
768 | unsigned long memlock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
769 | unsigned long user_bufs; | |
770 | ||
771 | if (user) { | |
772 | user_bufs = atomic_long_add_return(pages, &user->locked_vm); | |
773 | if (user_bufs > memlock_limit) { | |
774 | atomic_long_sub(pages, &user->locked_vm); | |
775 | return -EPERM; | |
776 | } | |
777 | } | |
778 | ||
779 | return 0; | |
780 | } | |
781 | ||
782 | void __bpf_prog_uncharge(struct user_struct *user, u32 pages) | |
783 | { | |
784 | if (user) | |
785 | atomic_long_sub(pages, &user->locked_vm); | |
786 | } | |
787 | ||
aaac3ba9 AS |
788 | static int bpf_prog_charge_memlock(struct bpf_prog *prog) |
789 | { | |
790 | struct user_struct *user = get_current_user(); | |
5ccb071e | 791 | int ret; |
aaac3ba9 | 792 | |
5ccb071e DB |
793 | ret = __bpf_prog_charge(user, prog->pages); |
794 | if (ret) { | |
aaac3ba9 | 795 | free_uid(user); |
5ccb071e | 796 | return ret; |
aaac3ba9 | 797 | } |
5ccb071e | 798 | |
aaac3ba9 AS |
799 | prog->aux->user = user; |
800 | return 0; | |
801 | } | |
802 | ||
803 | static void bpf_prog_uncharge_memlock(struct bpf_prog *prog) | |
804 | { | |
805 | struct user_struct *user = prog->aux->user; | |
806 | ||
5ccb071e | 807 | __bpf_prog_uncharge(user, prog->pages); |
aaac3ba9 AS |
808 | free_uid(user); |
809 | } | |
810 | ||
dc4bb0e2 MKL |
811 | static int bpf_prog_alloc_id(struct bpf_prog *prog) |
812 | { | |
813 | int id; | |
814 | ||
815 | spin_lock_bh(&prog_idr_lock); | |
816 | id = idr_alloc_cyclic(&prog_idr, prog, 1, INT_MAX, GFP_ATOMIC); | |
817 | if (id > 0) | |
818 | prog->aux->id = id; | |
819 | spin_unlock_bh(&prog_idr_lock); | |
820 | ||
821 | /* id is in [1, INT_MAX) */ | |
822 | if (WARN_ON_ONCE(!id)) | |
823 | return -ENOSPC; | |
824 | ||
825 | return id > 0 ? 0 : id; | |
826 | } | |
827 | ||
b16d9aa4 | 828 | static void bpf_prog_free_id(struct bpf_prog *prog, bool do_idr_lock) |
dc4bb0e2 MKL |
829 | { |
830 | /* cBPF to eBPF migrations are currently not in the idr store. */ | |
831 | if (!prog->aux->id) | |
832 | return; | |
833 | ||
b16d9aa4 MKL |
834 | if (do_idr_lock) |
835 | spin_lock_bh(&prog_idr_lock); | |
836 | else | |
837 | __acquire(&prog_idr_lock); | |
838 | ||
dc4bb0e2 | 839 | idr_remove(&prog_idr, prog->aux->id); |
b16d9aa4 MKL |
840 | |
841 | if (do_idr_lock) | |
842 | spin_unlock_bh(&prog_idr_lock); | |
843 | else | |
844 | __release(&prog_idr_lock); | |
dc4bb0e2 MKL |
845 | } |
846 | ||
1aacde3d | 847 | static void __bpf_prog_put_rcu(struct rcu_head *rcu) |
abf2e7d6 AS |
848 | { |
849 | struct bpf_prog_aux *aux = container_of(rcu, struct bpf_prog_aux, rcu); | |
850 | ||
851 | free_used_maps(aux); | |
aaac3ba9 | 852 | bpf_prog_uncharge_memlock(aux->prog); |
abf2e7d6 AS |
853 | bpf_prog_free(aux->prog); |
854 | } | |
855 | ||
b16d9aa4 | 856 | static void __bpf_prog_put(struct bpf_prog *prog, bool do_idr_lock) |
09756af4 | 857 | { |
a67edbf4 DB |
858 | if (atomic_dec_and_test(&prog->aux->refcnt)) { |
859 | trace_bpf_prog_put_rcu(prog); | |
34ad5580 | 860 | /* bpf_prog_free_id() must be called first */ |
b16d9aa4 | 861 | bpf_prog_free_id(prog, do_idr_lock); |
74451e66 | 862 | bpf_prog_kallsyms_del(prog); |
1aacde3d | 863 | call_rcu(&prog->aux->rcu, __bpf_prog_put_rcu); |
a67edbf4 | 864 | } |
09756af4 | 865 | } |
b16d9aa4 MKL |
866 | |
867 | void bpf_prog_put(struct bpf_prog *prog) | |
868 | { | |
869 | __bpf_prog_put(prog, true); | |
870 | } | |
e2e9b654 | 871 | EXPORT_SYMBOL_GPL(bpf_prog_put); |
09756af4 AS |
872 | |
873 | static int bpf_prog_release(struct inode *inode, struct file *filp) | |
874 | { | |
875 | struct bpf_prog *prog = filp->private_data; | |
876 | ||
1aacde3d | 877 | bpf_prog_put(prog); |
09756af4 AS |
878 | return 0; |
879 | } | |
880 | ||
7bd509e3 DB |
881 | #ifdef CONFIG_PROC_FS |
882 | static void bpf_prog_show_fdinfo(struct seq_file *m, struct file *filp) | |
883 | { | |
884 | const struct bpf_prog *prog = filp->private_data; | |
f1f7714e | 885 | char prog_tag[sizeof(prog->tag) * 2 + 1] = { }; |
7bd509e3 | 886 | |
f1f7714e | 887 | bin2hex(prog_tag, prog->tag, sizeof(prog->tag)); |
7bd509e3 DB |
888 | seq_printf(m, |
889 | "prog_type:\t%u\n" | |
890 | "prog_jited:\t%u\n" | |
f1f7714e | 891 | "prog_tag:\t%s\n" |
7bd509e3 DB |
892 | "memlock:\t%llu\n", |
893 | prog->type, | |
894 | prog->jited, | |
f1f7714e | 895 | prog_tag, |
7bd509e3 DB |
896 | prog->pages * 1ULL << PAGE_SHIFT); |
897 | } | |
898 | #endif | |
899 | ||
09756af4 | 900 | static const struct file_operations bpf_prog_fops = { |
7bd509e3 DB |
901 | #ifdef CONFIG_PROC_FS |
902 | .show_fdinfo = bpf_prog_show_fdinfo, | |
903 | #endif | |
904 | .release = bpf_prog_release, | |
09756af4 AS |
905 | }; |
906 | ||
b2197755 | 907 | int bpf_prog_new_fd(struct bpf_prog *prog) |
aa79781b DB |
908 | { |
909 | return anon_inode_getfd("bpf-prog", &bpf_prog_fops, prog, | |
910 | O_RDWR | O_CLOEXEC); | |
911 | } | |
912 | ||
113214be | 913 | static struct bpf_prog *____bpf_prog_get(struct fd f) |
09756af4 | 914 | { |
09756af4 AS |
915 | if (!f.file) |
916 | return ERR_PTR(-EBADF); | |
09756af4 AS |
917 | if (f.file->f_op != &bpf_prog_fops) { |
918 | fdput(f); | |
919 | return ERR_PTR(-EINVAL); | |
920 | } | |
921 | ||
c2101297 | 922 | return f.file->private_data; |
09756af4 AS |
923 | } |
924 | ||
59d3656d | 925 | struct bpf_prog *bpf_prog_add(struct bpf_prog *prog, int i) |
92117d84 | 926 | { |
59d3656d BB |
927 | if (atomic_add_return(i, &prog->aux->refcnt) > BPF_MAX_REFCNT) { |
928 | atomic_sub(i, &prog->aux->refcnt); | |
92117d84 AS |
929 | return ERR_PTR(-EBUSY); |
930 | } | |
931 | return prog; | |
932 | } | |
59d3656d BB |
933 | EXPORT_SYMBOL_GPL(bpf_prog_add); |
934 | ||
c540594f DB |
935 | void bpf_prog_sub(struct bpf_prog *prog, int i) |
936 | { | |
937 | /* Only to be used for undoing previous bpf_prog_add() in some | |
938 | * error path. We still know that another entity in our call | |
939 | * path holds a reference to the program, thus atomic_sub() can | |
940 | * be safely used in such cases! | |
941 | */ | |
942 | WARN_ON(atomic_sub_return(i, &prog->aux->refcnt) == 0); | |
943 | } | |
944 | EXPORT_SYMBOL_GPL(bpf_prog_sub); | |
945 | ||
59d3656d BB |
946 | struct bpf_prog *bpf_prog_inc(struct bpf_prog *prog) |
947 | { | |
948 | return bpf_prog_add(prog, 1); | |
949 | } | |
97bc402d | 950 | EXPORT_SYMBOL_GPL(bpf_prog_inc); |
92117d84 | 951 | |
b16d9aa4 | 952 | /* prog_idr_lock should have been held */ |
a6f6df69 | 953 | struct bpf_prog *bpf_prog_inc_not_zero(struct bpf_prog *prog) |
b16d9aa4 MKL |
954 | { |
955 | int refold; | |
956 | ||
957 | refold = __atomic_add_unless(&prog->aux->refcnt, 1, 0); | |
958 | ||
959 | if (refold >= BPF_MAX_REFCNT) { | |
960 | __bpf_prog_put(prog, false); | |
961 | return ERR_PTR(-EBUSY); | |
962 | } | |
963 | ||
964 | if (!refold) | |
965 | return ERR_PTR(-ENOENT); | |
966 | ||
967 | return prog; | |
968 | } | |
a6f6df69 | 969 | EXPORT_SYMBOL_GPL(bpf_prog_inc_not_zero); |
b16d9aa4 | 970 | |
113214be | 971 | static struct bpf_prog *__bpf_prog_get(u32 ufd, enum bpf_prog_type *type) |
09756af4 AS |
972 | { |
973 | struct fd f = fdget(ufd); | |
974 | struct bpf_prog *prog; | |
975 | ||
113214be | 976 | prog = ____bpf_prog_get(f); |
09756af4 AS |
977 | if (IS_ERR(prog)) |
978 | return prog; | |
113214be DB |
979 | if (type && prog->type != *type) { |
980 | prog = ERR_PTR(-EINVAL); | |
981 | goto out; | |
982 | } | |
09756af4 | 983 | |
92117d84 | 984 | prog = bpf_prog_inc(prog); |
113214be | 985 | out: |
09756af4 AS |
986 | fdput(f); |
987 | return prog; | |
988 | } | |
113214be DB |
989 | |
990 | struct bpf_prog *bpf_prog_get(u32 ufd) | |
991 | { | |
992 | return __bpf_prog_get(ufd, NULL); | |
993 | } | |
994 | ||
995 | struct bpf_prog *bpf_prog_get_type(u32 ufd, enum bpf_prog_type type) | |
996 | { | |
a67edbf4 DB |
997 | struct bpf_prog *prog = __bpf_prog_get(ufd, &type); |
998 | ||
999 | if (!IS_ERR(prog)) | |
1000 | trace_bpf_prog_get_type(prog); | |
1001 | return prog; | |
113214be DB |
1002 | } |
1003 | EXPORT_SYMBOL_GPL(bpf_prog_get_type); | |
09756af4 AS |
1004 | |
1005 | /* last field in 'union bpf_attr' used by this command */ | |
cb4d2b3f | 1006 | #define BPF_PROG_LOAD_LAST_FIELD prog_name |
09756af4 AS |
1007 | |
1008 | static int bpf_prog_load(union bpf_attr *attr) | |
1009 | { | |
1010 | enum bpf_prog_type type = attr->prog_type; | |
1011 | struct bpf_prog *prog; | |
1012 | int err; | |
1013 | char license[128]; | |
1014 | bool is_gpl; | |
1015 | ||
1016 | if (CHECK_ATTR(BPF_PROG_LOAD)) | |
1017 | return -EINVAL; | |
1018 | ||
e07b98d9 DM |
1019 | if (attr->prog_flags & ~BPF_F_STRICT_ALIGNMENT) |
1020 | return -EINVAL; | |
1021 | ||
09756af4 | 1022 | /* copy eBPF program license from user space */ |
535e7b4b | 1023 | if (strncpy_from_user(license, u64_to_user_ptr(attr->license), |
09756af4 AS |
1024 | sizeof(license) - 1) < 0) |
1025 | return -EFAULT; | |
1026 | license[sizeof(license) - 1] = 0; | |
1027 | ||
1028 | /* eBPF programs must be GPL compatible to use GPL-ed functions */ | |
1029 | is_gpl = license_is_gpl_compatible(license); | |
1030 | ||
ef0915ca DB |
1031 | if (attr->insn_cnt == 0 || attr->insn_cnt > BPF_MAXINSNS) |
1032 | return -E2BIG; | |
09756af4 | 1033 | |
2541517c AS |
1034 | if (type == BPF_PROG_TYPE_KPROBE && |
1035 | attr->kern_version != LINUX_VERSION_CODE) | |
1036 | return -EINVAL; | |
1037 | ||
80b7d819 CF |
1038 | if (type != BPF_PROG_TYPE_SOCKET_FILTER && |
1039 | type != BPF_PROG_TYPE_CGROUP_SKB && | |
1040 | !capable(CAP_SYS_ADMIN)) | |
1be7f75d AS |
1041 | return -EPERM; |
1042 | ||
09756af4 AS |
1043 | /* plain bpf_prog allocation */ |
1044 | prog = bpf_prog_alloc(bpf_prog_size(attr->insn_cnt), GFP_USER); | |
1045 | if (!prog) | |
1046 | return -ENOMEM; | |
1047 | ||
aaac3ba9 AS |
1048 | err = bpf_prog_charge_memlock(prog); |
1049 | if (err) | |
1050 | goto free_prog_nouncharge; | |
1051 | ||
09756af4 AS |
1052 | prog->len = attr->insn_cnt; |
1053 | ||
1054 | err = -EFAULT; | |
535e7b4b | 1055 | if (copy_from_user(prog->insns, u64_to_user_ptr(attr->insns), |
aafe6ae9 | 1056 | bpf_prog_insn_size(prog)) != 0) |
09756af4 AS |
1057 | goto free_prog; |
1058 | ||
1059 | prog->orig_prog = NULL; | |
a91263d5 | 1060 | prog->jited = 0; |
09756af4 AS |
1061 | |
1062 | atomic_set(&prog->aux->refcnt, 1); | |
a91263d5 | 1063 | prog->gpl_compatible = is_gpl ? 1 : 0; |
09756af4 AS |
1064 | |
1065 | /* find program type: socket_filter vs tracing_filter */ | |
1066 | err = find_prog_type(type, prog); | |
1067 | if (err < 0) | |
1068 | goto free_prog; | |
1069 | ||
cb4d2b3f MKL |
1070 | prog->aux->load_time = ktime_get_boot_ns(); |
1071 | err = bpf_obj_name_cpy(prog->aux->name, attr->prog_name); | |
1072 | if (err) | |
1073 | goto free_prog; | |
1074 | ||
09756af4 | 1075 | /* run eBPF verifier */ |
9bac3d6d | 1076 | err = bpf_check(&prog, attr); |
09756af4 AS |
1077 | if (err < 0) |
1078 | goto free_used_maps; | |
1079 | ||
1080 | /* eBPF program is ready to be JITed */ | |
d1c55ab5 | 1081 | prog = bpf_prog_select_runtime(prog, &err); |
04fd61ab AS |
1082 | if (err < 0) |
1083 | goto free_used_maps; | |
09756af4 | 1084 | |
dc4bb0e2 MKL |
1085 | err = bpf_prog_alloc_id(prog); |
1086 | if (err) | |
1087 | goto free_used_maps; | |
1088 | ||
aa79781b | 1089 | err = bpf_prog_new_fd(prog); |
b16d9aa4 MKL |
1090 | if (err < 0) { |
1091 | /* failed to allocate fd. | |
1092 | * bpf_prog_put() is needed because the above | |
1093 | * bpf_prog_alloc_id() has published the prog | |
1094 | * to the userspace and the userspace may | |
1095 | * have refcnt-ed it through BPF_PROG_GET_FD_BY_ID. | |
1096 | */ | |
1097 | bpf_prog_put(prog); | |
1098 | return err; | |
1099 | } | |
09756af4 | 1100 | |
74451e66 | 1101 | bpf_prog_kallsyms_add(prog); |
a67edbf4 | 1102 | trace_bpf_prog_load(prog, err); |
09756af4 AS |
1103 | return err; |
1104 | ||
1105 | free_used_maps: | |
1106 | free_used_maps(prog->aux); | |
1107 | free_prog: | |
aaac3ba9 AS |
1108 | bpf_prog_uncharge_memlock(prog); |
1109 | free_prog_nouncharge: | |
09756af4 AS |
1110 | bpf_prog_free(prog); |
1111 | return err; | |
1112 | } | |
1113 | ||
b2197755 DB |
1114 | #define BPF_OBJ_LAST_FIELD bpf_fd |
1115 | ||
1116 | static int bpf_obj_pin(const union bpf_attr *attr) | |
1117 | { | |
1118 | if (CHECK_ATTR(BPF_OBJ)) | |
1119 | return -EINVAL; | |
1120 | ||
535e7b4b | 1121 | return bpf_obj_pin_user(attr->bpf_fd, u64_to_user_ptr(attr->pathname)); |
b2197755 DB |
1122 | } |
1123 | ||
1124 | static int bpf_obj_get(const union bpf_attr *attr) | |
1125 | { | |
1126 | if (CHECK_ATTR(BPF_OBJ) || attr->bpf_fd != 0) | |
1127 | return -EINVAL; | |
1128 | ||
535e7b4b | 1129 | return bpf_obj_get_user(u64_to_user_ptr(attr->pathname)); |
b2197755 DB |
1130 | } |
1131 | ||
f4324551 DM |
1132 | #ifdef CONFIG_CGROUP_BPF |
1133 | ||
464bc0fd | 1134 | #define BPF_PROG_ATTACH_LAST_FIELD attach_flags |
174a79ff | 1135 | |
5a67da2a | 1136 | static int sockmap_get_from_fd(const union bpf_attr *attr, bool attach) |
174a79ff | 1137 | { |
5a67da2a | 1138 | struct bpf_prog *prog = NULL; |
174a79ff JF |
1139 | int ufd = attr->target_fd; |
1140 | struct bpf_map *map; | |
1141 | struct fd f; | |
1142 | int err; | |
1143 | ||
1144 | f = fdget(ufd); | |
1145 | map = __bpf_map_get(f); | |
1146 | if (IS_ERR(map)) | |
1147 | return PTR_ERR(map); | |
1148 | ||
5a67da2a JF |
1149 | if (attach) { |
1150 | prog = bpf_prog_get_type(attr->attach_bpf_fd, | |
1151 | BPF_PROG_TYPE_SK_SKB); | |
1152 | if (IS_ERR(prog)) { | |
1153 | fdput(f); | |
1154 | return PTR_ERR(prog); | |
1155 | } | |
174a79ff JF |
1156 | } |
1157 | ||
5a67da2a | 1158 | err = sock_map_prog(map, prog, attr->attach_type); |
174a79ff JF |
1159 | if (err) { |
1160 | fdput(f); | |
5a67da2a JF |
1161 | if (prog) |
1162 | bpf_prog_put(prog); | |
ae2b27b8 | 1163 | return err; |
174a79ff JF |
1164 | } |
1165 | ||
1166 | fdput(f); | |
ae2b27b8 | 1167 | return 0; |
174a79ff | 1168 | } |
f4324551 | 1169 | |
324bda9e AS |
1170 | #define BPF_F_ATTACH_MASK \ |
1171 | (BPF_F_ALLOW_OVERRIDE | BPF_F_ALLOW_MULTI) | |
1172 | ||
f4324551 DM |
1173 | static int bpf_prog_attach(const union bpf_attr *attr) |
1174 | { | |
7f677633 | 1175 | enum bpf_prog_type ptype; |
f4324551 DM |
1176 | struct bpf_prog *prog; |
1177 | struct cgroup *cgrp; | |
7f677633 | 1178 | int ret; |
f4324551 DM |
1179 | |
1180 | if (!capable(CAP_NET_ADMIN)) | |
1181 | return -EPERM; | |
1182 | ||
1183 | if (CHECK_ATTR(BPF_PROG_ATTACH)) | |
1184 | return -EINVAL; | |
1185 | ||
324bda9e | 1186 | if (attr->attach_flags & ~BPF_F_ATTACH_MASK) |
7f677633 AS |
1187 | return -EINVAL; |
1188 | ||
f4324551 DM |
1189 | switch (attr->attach_type) { |
1190 | case BPF_CGROUP_INET_INGRESS: | |
1191 | case BPF_CGROUP_INET_EGRESS: | |
b2cd1257 | 1192 | ptype = BPF_PROG_TYPE_CGROUP_SKB; |
f4324551 | 1193 | break; |
61023658 DA |
1194 | case BPF_CGROUP_INET_SOCK_CREATE: |
1195 | ptype = BPF_PROG_TYPE_CGROUP_SOCK; | |
1196 | break; | |
40304b2a LB |
1197 | case BPF_CGROUP_SOCK_OPS: |
1198 | ptype = BPF_PROG_TYPE_SOCK_OPS; | |
1199 | break; | |
464bc0fd JF |
1200 | case BPF_SK_SKB_STREAM_PARSER: |
1201 | case BPF_SK_SKB_STREAM_VERDICT: | |
5a67da2a | 1202 | return sockmap_get_from_fd(attr, true); |
f4324551 DM |
1203 | default: |
1204 | return -EINVAL; | |
1205 | } | |
1206 | ||
b2cd1257 DA |
1207 | prog = bpf_prog_get_type(attr->attach_bpf_fd, ptype); |
1208 | if (IS_ERR(prog)) | |
1209 | return PTR_ERR(prog); | |
1210 | ||
1211 | cgrp = cgroup_get_from_fd(attr->target_fd); | |
1212 | if (IS_ERR(cgrp)) { | |
1213 | bpf_prog_put(prog); | |
1214 | return PTR_ERR(cgrp); | |
1215 | } | |
1216 | ||
324bda9e AS |
1217 | ret = cgroup_bpf_attach(cgrp, prog, attr->attach_type, |
1218 | attr->attach_flags); | |
7f677633 AS |
1219 | if (ret) |
1220 | bpf_prog_put(prog); | |
b2cd1257 DA |
1221 | cgroup_put(cgrp); |
1222 | ||
7f677633 | 1223 | return ret; |
f4324551 DM |
1224 | } |
1225 | ||
1226 | #define BPF_PROG_DETACH_LAST_FIELD attach_type | |
1227 | ||
1228 | static int bpf_prog_detach(const union bpf_attr *attr) | |
1229 | { | |
324bda9e AS |
1230 | enum bpf_prog_type ptype; |
1231 | struct bpf_prog *prog; | |
f4324551 | 1232 | struct cgroup *cgrp; |
7f677633 | 1233 | int ret; |
f4324551 DM |
1234 | |
1235 | if (!capable(CAP_NET_ADMIN)) | |
1236 | return -EPERM; | |
1237 | ||
1238 | if (CHECK_ATTR(BPF_PROG_DETACH)) | |
1239 | return -EINVAL; | |
1240 | ||
1241 | switch (attr->attach_type) { | |
1242 | case BPF_CGROUP_INET_INGRESS: | |
1243 | case BPF_CGROUP_INET_EGRESS: | |
324bda9e AS |
1244 | ptype = BPF_PROG_TYPE_CGROUP_SKB; |
1245 | break; | |
61023658 | 1246 | case BPF_CGROUP_INET_SOCK_CREATE: |
324bda9e AS |
1247 | ptype = BPF_PROG_TYPE_CGROUP_SOCK; |
1248 | break; | |
40304b2a | 1249 | case BPF_CGROUP_SOCK_OPS: |
324bda9e | 1250 | ptype = BPF_PROG_TYPE_SOCK_OPS; |
f4324551 | 1251 | break; |
5a67da2a JF |
1252 | case BPF_SK_SKB_STREAM_PARSER: |
1253 | case BPF_SK_SKB_STREAM_VERDICT: | |
324bda9e | 1254 | return sockmap_get_from_fd(attr, false); |
f4324551 DM |
1255 | default: |
1256 | return -EINVAL; | |
1257 | } | |
1258 | ||
324bda9e AS |
1259 | cgrp = cgroup_get_from_fd(attr->target_fd); |
1260 | if (IS_ERR(cgrp)) | |
1261 | return PTR_ERR(cgrp); | |
1262 | ||
1263 | prog = bpf_prog_get_type(attr->attach_bpf_fd, ptype); | |
1264 | if (IS_ERR(prog)) | |
1265 | prog = NULL; | |
1266 | ||
1267 | ret = cgroup_bpf_detach(cgrp, prog, attr->attach_type, 0); | |
1268 | if (prog) | |
1269 | bpf_prog_put(prog); | |
1270 | cgroup_put(cgrp); | |
7f677633 | 1271 | return ret; |
f4324551 | 1272 | } |
40304b2a | 1273 | |
468e2f64 AS |
1274 | #define BPF_PROG_QUERY_LAST_FIELD query.prog_cnt |
1275 | ||
1276 | static int bpf_prog_query(const union bpf_attr *attr, | |
1277 | union bpf_attr __user *uattr) | |
1278 | { | |
1279 | struct cgroup *cgrp; | |
1280 | int ret; | |
1281 | ||
1282 | if (!capable(CAP_NET_ADMIN)) | |
1283 | return -EPERM; | |
1284 | if (CHECK_ATTR(BPF_PROG_QUERY)) | |
1285 | return -EINVAL; | |
1286 | if (attr->query.query_flags & ~BPF_F_QUERY_EFFECTIVE) | |
1287 | return -EINVAL; | |
1288 | ||
1289 | switch (attr->query.attach_type) { | |
1290 | case BPF_CGROUP_INET_INGRESS: | |
1291 | case BPF_CGROUP_INET_EGRESS: | |
1292 | case BPF_CGROUP_INET_SOCK_CREATE: | |
1293 | case BPF_CGROUP_SOCK_OPS: | |
1294 | break; | |
1295 | default: | |
1296 | return -EINVAL; | |
1297 | } | |
1298 | cgrp = cgroup_get_from_fd(attr->query.target_fd); | |
1299 | if (IS_ERR(cgrp)) | |
1300 | return PTR_ERR(cgrp); | |
1301 | ret = cgroup_bpf_query(cgrp, attr, uattr); | |
1302 | cgroup_put(cgrp); | |
1303 | return ret; | |
1304 | } | |
f4324551 DM |
1305 | #endif /* CONFIG_CGROUP_BPF */ |
1306 | ||
1cf1cae9 AS |
1307 | #define BPF_PROG_TEST_RUN_LAST_FIELD test.duration |
1308 | ||
1309 | static int bpf_prog_test_run(const union bpf_attr *attr, | |
1310 | union bpf_attr __user *uattr) | |
1311 | { | |
1312 | struct bpf_prog *prog; | |
1313 | int ret = -ENOTSUPP; | |
1314 | ||
1315 | if (CHECK_ATTR(BPF_PROG_TEST_RUN)) | |
1316 | return -EINVAL; | |
1317 | ||
1318 | prog = bpf_prog_get(attr->test.prog_fd); | |
1319 | if (IS_ERR(prog)) | |
1320 | return PTR_ERR(prog); | |
1321 | ||
1322 | if (prog->aux->ops->test_run) | |
1323 | ret = prog->aux->ops->test_run(prog, attr, uattr); | |
1324 | ||
1325 | bpf_prog_put(prog); | |
1326 | return ret; | |
1327 | } | |
1328 | ||
34ad5580 MKL |
1329 | #define BPF_OBJ_GET_NEXT_ID_LAST_FIELD next_id |
1330 | ||
1331 | static int bpf_obj_get_next_id(const union bpf_attr *attr, | |
1332 | union bpf_attr __user *uattr, | |
1333 | struct idr *idr, | |
1334 | spinlock_t *lock) | |
1335 | { | |
1336 | u32 next_id = attr->start_id; | |
1337 | int err = 0; | |
1338 | ||
1339 | if (CHECK_ATTR(BPF_OBJ_GET_NEXT_ID) || next_id >= INT_MAX) | |
1340 | return -EINVAL; | |
1341 | ||
1342 | if (!capable(CAP_SYS_ADMIN)) | |
1343 | return -EPERM; | |
1344 | ||
1345 | next_id++; | |
1346 | spin_lock_bh(lock); | |
1347 | if (!idr_get_next(idr, &next_id)) | |
1348 | err = -ENOENT; | |
1349 | spin_unlock_bh(lock); | |
1350 | ||
1351 | if (!err) | |
1352 | err = put_user(next_id, &uattr->next_id); | |
1353 | ||
1354 | return err; | |
1355 | } | |
1356 | ||
b16d9aa4 MKL |
1357 | #define BPF_PROG_GET_FD_BY_ID_LAST_FIELD prog_id |
1358 | ||
1359 | static int bpf_prog_get_fd_by_id(const union bpf_attr *attr) | |
1360 | { | |
1361 | struct bpf_prog *prog; | |
1362 | u32 id = attr->prog_id; | |
1363 | int fd; | |
1364 | ||
1365 | if (CHECK_ATTR(BPF_PROG_GET_FD_BY_ID)) | |
1366 | return -EINVAL; | |
1367 | ||
1368 | if (!capable(CAP_SYS_ADMIN)) | |
1369 | return -EPERM; | |
1370 | ||
1371 | spin_lock_bh(&prog_idr_lock); | |
1372 | prog = idr_find(&prog_idr, id); | |
1373 | if (prog) | |
1374 | prog = bpf_prog_inc_not_zero(prog); | |
1375 | else | |
1376 | prog = ERR_PTR(-ENOENT); | |
1377 | spin_unlock_bh(&prog_idr_lock); | |
1378 | ||
1379 | if (IS_ERR(prog)) | |
1380 | return PTR_ERR(prog); | |
1381 | ||
1382 | fd = bpf_prog_new_fd(prog); | |
1383 | if (fd < 0) | |
1384 | bpf_prog_put(prog); | |
1385 | ||
1386 | return fd; | |
1387 | } | |
1388 | ||
bd5f5f4e MKL |
1389 | #define BPF_MAP_GET_FD_BY_ID_LAST_FIELD map_id |
1390 | ||
1391 | static int bpf_map_get_fd_by_id(const union bpf_attr *attr) | |
1392 | { | |
1393 | struct bpf_map *map; | |
1394 | u32 id = attr->map_id; | |
1395 | int fd; | |
1396 | ||
1397 | if (CHECK_ATTR(BPF_MAP_GET_FD_BY_ID)) | |
1398 | return -EINVAL; | |
1399 | ||
1400 | if (!capable(CAP_SYS_ADMIN)) | |
1401 | return -EPERM; | |
1402 | ||
1403 | spin_lock_bh(&map_idr_lock); | |
1404 | map = idr_find(&map_idr, id); | |
1405 | if (map) | |
1406 | map = bpf_map_inc_not_zero(map, true); | |
1407 | else | |
1408 | map = ERR_PTR(-ENOENT); | |
1409 | spin_unlock_bh(&map_idr_lock); | |
1410 | ||
1411 | if (IS_ERR(map)) | |
1412 | return PTR_ERR(map); | |
1413 | ||
1414 | fd = bpf_map_new_fd(map); | |
1415 | if (fd < 0) | |
1416 | bpf_map_put(map); | |
1417 | ||
1418 | return fd; | |
1419 | } | |
1420 | ||
1e270976 MKL |
1421 | static int bpf_prog_get_info_by_fd(struct bpf_prog *prog, |
1422 | const union bpf_attr *attr, | |
1423 | union bpf_attr __user *uattr) | |
1424 | { | |
1425 | struct bpf_prog_info __user *uinfo = u64_to_user_ptr(attr->info.info); | |
1426 | struct bpf_prog_info info = {}; | |
1427 | u32 info_len = attr->info.info_len; | |
1428 | char __user *uinsns; | |
1429 | u32 ulen; | |
1430 | int err; | |
1431 | ||
1432 | err = check_uarg_tail_zero(uinfo, sizeof(info), info_len); | |
1433 | if (err) | |
1434 | return err; | |
1435 | info_len = min_t(u32, sizeof(info), info_len); | |
1436 | ||
1437 | if (copy_from_user(&info, uinfo, info_len)) | |
89b09689 | 1438 | return -EFAULT; |
1e270976 MKL |
1439 | |
1440 | info.type = prog->type; | |
1441 | info.id = prog->aux->id; | |
cb4d2b3f MKL |
1442 | info.load_time = prog->aux->load_time; |
1443 | info.created_by_uid = from_kuid_munged(current_user_ns(), | |
1444 | prog->aux->user->uid); | |
1e270976 MKL |
1445 | |
1446 | memcpy(info.tag, prog->tag, sizeof(prog->tag)); | |
cb4d2b3f MKL |
1447 | memcpy(info.name, prog->aux->name, sizeof(prog->aux->name)); |
1448 | ||
1449 | ulen = info.nr_map_ids; | |
1450 | info.nr_map_ids = prog->aux->used_map_cnt; | |
1451 | ulen = min_t(u32, info.nr_map_ids, ulen); | |
1452 | if (ulen) { | |
721e08da | 1453 | u32 __user *user_map_ids = u64_to_user_ptr(info.map_ids); |
cb4d2b3f MKL |
1454 | u32 i; |
1455 | ||
1456 | for (i = 0; i < ulen; i++) | |
1457 | if (put_user(prog->aux->used_maps[i]->id, | |
1458 | &user_map_ids[i])) | |
1459 | return -EFAULT; | |
1460 | } | |
1e270976 MKL |
1461 | |
1462 | if (!capable(CAP_SYS_ADMIN)) { | |
1463 | info.jited_prog_len = 0; | |
1464 | info.xlated_prog_len = 0; | |
1465 | goto done; | |
1466 | } | |
1467 | ||
1468 | ulen = info.jited_prog_len; | |
1469 | info.jited_prog_len = prog->jited_len; | |
1470 | if (info.jited_prog_len && ulen) { | |
1471 | uinsns = u64_to_user_ptr(info.jited_prog_insns); | |
1472 | ulen = min_t(u32, info.jited_prog_len, ulen); | |
1473 | if (copy_to_user(uinsns, prog->bpf_func, ulen)) | |
1474 | return -EFAULT; | |
1475 | } | |
1476 | ||
1477 | ulen = info.xlated_prog_len; | |
9975a54b | 1478 | info.xlated_prog_len = bpf_prog_insn_size(prog); |
1e270976 MKL |
1479 | if (info.xlated_prog_len && ulen) { |
1480 | uinsns = u64_to_user_ptr(info.xlated_prog_insns); | |
1481 | ulen = min_t(u32, info.xlated_prog_len, ulen); | |
1482 | if (copy_to_user(uinsns, prog->insnsi, ulen)) | |
1483 | return -EFAULT; | |
1484 | } | |
1485 | ||
1486 | done: | |
1487 | if (copy_to_user(uinfo, &info, info_len) || | |
1488 | put_user(info_len, &uattr->info.info_len)) | |
1489 | return -EFAULT; | |
1490 | ||
1491 | return 0; | |
1492 | } | |
1493 | ||
1494 | static int bpf_map_get_info_by_fd(struct bpf_map *map, | |
1495 | const union bpf_attr *attr, | |
1496 | union bpf_attr __user *uattr) | |
1497 | { | |
1498 | struct bpf_map_info __user *uinfo = u64_to_user_ptr(attr->info.info); | |
1499 | struct bpf_map_info info = {}; | |
1500 | u32 info_len = attr->info.info_len; | |
1501 | int err; | |
1502 | ||
1503 | err = check_uarg_tail_zero(uinfo, sizeof(info), info_len); | |
1504 | if (err) | |
1505 | return err; | |
1506 | info_len = min_t(u32, sizeof(info), info_len); | |
1507 | ||
1508 | info.type = map->map_type; | |
1509 | info.id = map->id; | |
1510 | info.key_size = map->key_size; | |
1511 | info.value_size = map->value_size; | |
1512 | info.max_entries = map->max_entries; | |
1513 | info.map_flags = map->map_flags; | |
ad5b177b | 1514 | memcpy(info.name, map->name, sizeof(map->name)); |
1e270976 MKL |
1515 | |
1516 | if (copy_to_user(uinfo, &info, info_len) || | |
1517 | put_user(info_len, &uattr->info.info_len)) | |
1518 | return -EFAULT; | |
1519 | ||
1520 | return 0; | |
1521 | } | |
1522 | ||
1523 | #define BPF_OBJ_GET_INFO_BY_FD_LAST_FIELD info.info | |
1524 | ||
1525 | static int bpf_obj_get_info_by_fd(const union bpf_attr *attr, | |
1526 | union bpf_attr __user *uattr) | |
1527 | { | |
1528 | int ufd = attr->info.bpf_fd; | |
1529 | struct fd f; | |
1530 | int err; | |
1531 | ||
1532 | if (CHECK_ATTR(BPF_OBJ_GET_INFO_BY_FD)) | |
1533 | return -EINVAL; | |
1534 | ||
1535 | f = fdget(ufd); | |
1536 | if (!f.file) | |
1537 | return -EBADFD; | |
1538 | ||
1539 | if (f.file->f_op == &bpf_prog_fops) | |
1540 | err = bpf_prog_get_info_by_fd(f.file->private_data, attr, | |
1541 | uattr); | |
1542 | else if (f.file->f_op == &bpf_map_fops) | |
1543 | err = bpf_map_get_info_by_fd(f.file->private_data, attr, | |
1544 | uattr); | |
1545 | else | |
1546 | err = -EINVAL; | |
1547 | ||
1548 | fdput(f); | |
1549 | return err; | |
1550 | } | |
1551 | ||
99c55f7d AS |
1552 | SYSCALL_DEFINE3(bpf, int, cmd, union bpf_attr __user *, uattr, unsigned int, size) |
1553 | { | |
1554 | union bpf_attr attr = {}; | |
1555 | int err; | |
1556 | ||
1be7f75d | 1557 | if (!capable(CAP_SYS_ADMIN) && sysctl_unprivileged_bpf_disabled) |
99c55f7d AS |
1558 | return -EPERM; |
1559 | ||
1e270976 MKL |
1560 | err = check_uarg_tail_zero(uattr, sizeof(attr), size); |
1561 | if (err) | |
1562 | return err; | |
1563 | size = min_t(u32, size, sizeof(attr)); | |
99c55f7d AS |
1564 | |
1565 | /* copy attributes from user space, may be less than sizeof(bpf_attr) */ | |
1566 | if (copy_from_user(&attr, uattr, size) != 0) | |
1567 | return -EFAULT; | |
1568 | ||
1569 | switch (cmd) { | |
1570 | case BPF_MAP_CREATE: | |
1571 | err = map_create(&attr); | |
1572 | break; | |
db20fd2b AS |
1573 | case BPF_MAP_LOOKUP_ELEM: |
1574 | err = map_lookup_elem(&attr); | |
1575 | break; | |
1576 | case BPF_MAP_UPDATE_ELEM: | |
1577 | err = map_update_elem(&attr); | |
1578 | break; | |
1579 | case BPF_MAP_DELETE_ELEM: | |
1580 | err = map_delete_elem(&attr); | |
1581 | break; | |
1582 | case BPF_MAP_GET_NEXT_KEY: | |
1583 | err = map_get_next_key(&attr); | |
1584 | break; | |
09756af4 AS |
1585 | case BPF_PROG_LOAD: |
1586 | err = bpf_prog_load(&attr); | |
1587 | break; | |
b2197755 DB |
1588 | case BPF_OBJ_PIN: |
1589 | err = bpf_obj_pin(&attr); | |
1590 | break; | |
1591 | case BPF_OBJ_GET: | |
1592 | err = bpf_obj_get(&attr); | |
1593 | break; | |
f4324551 DM |
1594 | #ifdef CONFIG_CGROUP_BPF |
1595 | case BPF_PROG_ATTACH: | |
1596 | err = bpf_prog_attach(&attr); | |
1597 | break; | |
1598 | case BPF_PROG_DETACH: | |
1599 | err = bpf_prog_detach(&attr); | |
1600 | break; | |
468e2f64 AS |
1601 | case BPF_PROG_QUERY: |
1602 | err = bpf_prog_query(&attr, uattr); | |
1603 | break; | |
f4324551 | 1604 | #endif |
1cf1cae9 AS |
1605 | case BPF_PROG_TEST_RUN: |
1606 | err = bpf_prog_test_run(&attr, uattr); | |
1607 | break; | |
34ad5580 MKL |
1608 | case BPF_PROG_GET_NEXT_ID: |
1609 | err = bpf_obj_get_next_id(&attr, uattr, | |
1610 | &prog_idr, &prog_idr_lock); | |
1611 | break; | |
1612 | case BPF_MAP_GET_NEXT_ID: | |
1613 | err = bpf_obj_get_next_id(&attr, uattr, | |
1614 | &map_idr, &map_idr_lock); | |
1615 | break; | |
b16d9aa4 MKL |
1616 | case BPF_PROG_GET_FD_BY_ID: |
1617 | err = bpf_prog_get_fd_by_id(&attr); | |
1618 | break; | |
bd5f5f4e MKL |
1619 | case BPF_MAP_GET_FD_BY_ID: |
1620 | err = bpf_map_get_fd_by_id(&attr); | |
1621 | break; | |
1e270976 MKL |
1622 | case BPF_OBJ_GET_INFO_BY_FD: |
1623 | err = bpf_obj_get_info_by_fd(&attr, uattr); | |
1624 | break; | |
99c55f7d AS |
1625 | default: |
1626 | err = -EINVAL; | |
1627 | break; | |
1628 | } | |
1629 | ||
1630 | return err; | |
1631 | } |