Commit | Line | Data |
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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 | ||
6710e112 JDB |
595 | /* Need to create a kthread, thus must support schedule */ |
596 | if (map->map_type == BPF_MAP_TYPE_CPUMAP) { | |
597 | err = map->ops->map_update_elem(map, key, value, attr->flags); | |
598 | goto out; | |
599 | } | |
600 | ||
b121d1e7 AS |
601 | /* must increment bpf_prog_active to avoid kprobe+bpf triggering from |
602 | * inside bpf map update or delete otherwise deadlocks are possible | |
603 | */ | |
604 | preempt_disable(); | |
605 | __this_cpu_inc(bpf_prog_active); | |
8f844938 MKL |
606 | if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH || |
607 | map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH) { | |
15a07b33 AS |
608 | err = bpf_percpu_hash_update(map, key, value, attr->flags); |
609 | } else if (map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY) { | |
610 | err = bpf_percpu_array_update(map, key, value, attr->flags); | |
d056a788 | 611 | } else if (map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY || |
4ed8ec52 | 612 | map->map_type == BPF_MAP_TYPE_PROG_ARRAY || |
56f668df MKL |
613 | map->map_type == BPF_MAP_TYPE_CGROUP_ARRAY || |
614 | map->map_type == BPF_MAP_TYPE_ARRAY_OF_MAPS) { | |
d056a788 DB |
615 | rcu_read_lock(); |
616 | err = bpf_fd_array_map_update_elem(map, f.file, key, value, | |
617 | attr->flags); | |
618 | rcu_read_unlock(); | |
bcc6b1b7 MKL |
619 | } else if (map->map_type == BPF_MAP_TYPE_HASH_OF_MAPS) { |
620 | rcu_read_lock(); | |
621 | err = bpf_fd_htab_map_update_elem(map, f.file, key, value, | |
622 | attr->flags); | |
623 | rcu_read_unlock(); | |
15a07b33 AS |
624 | } else { |
625 | rcu_read_lock(); | |
626 | err = map->ops->map_update_elem(map, key, value, attr->flags); | |
627 | rcu_read_unlock(); | |
628 | } | |
b121d1e7 AS |
629 | __this_cpu_dec(bpf_prog_active); |
630 | preempt_enable(); | |
6710e112 | 631 | out: |
a67edbf4 DB |
632 | if (!err) |
633 | trace_bpf_map_update_elem(map, ufd, key, value); | |
db20fd2b AS |
634 | free_value: |
635 | kfree(value); | |
636 | free_key: | |
637 | kfree(key); | |
638 | err_put: | |
639 | fdput(f); | |
640 | return err; | |
641 | } | |
642 | ||
643 | #define BPF_MAP_DELETE_ELEM_LAST_FIELD key | |
644 | ||
645 | static int map_delete_elem(union bpf_attr *attr) | |
646 | { | |
535e7b4b | 647 | void __user *ukey = u64_to_user_ptr(attr->key); |
db20fd2b | 648 | int ufd = attr->map_fd; |
db20fd2b | 649 | struct bpf_map *map; |
592867bf | 650 | struct fd f; |
db20fd2b AS |
651 | void *key; |
652 | int err; | |
653 | ||
654 | if (CHECK_ATTR(BPF_MAP_DELETE_ELEM)) | |
655 | return -EINVAL; | |
656 | ||
592867bf | 657 | f = fdget(ufd); |
c2101297 | 658 | map = __bpf_map_get(f); |
db20fd2b AS |
659 | if (IS_ERR(map)) |
660 | return PTR_ERR(map); | |
661 | ||
e4448ed8 AV |
662 | key = memdup_user(ukey, map->key_size); |
663 | if (IS_ERR(key)) { | |
664 | err = PTR_ERR(key); | |
db20fd2b | 665 | goto err_put; |
e4448ed8 | 666 | } |
db20fd2b | 667 | |
b121d1e7 AS |
668 | preempt_disable(); |
669 | __this_cpu_inc(bpf_prog_active); | |
db20fd2b AS |
670 | rcu_read_lock(); |
671 | err = map->ops->map_delete_elem(map, key); | |
672 | rcu_read_unlock(); | |
b121d1e7 AS |
673 | __this_cpu_dec(bpf_prog_active); |
674 | preempt_enable(); | |
db20fd2b | 675 | |
a67edbf4 DB |
676 | if (!err) |
677 | trace_bpf_map_delete_elem(map, ufd, key); | |
db20fd2b AS |
678 | kfree(key); |
679 | err_put: | |
680 | fdput(f); | |
681 | return err; | |
682 | } | |
683 | ||
684 | /* last field in 'union bpf_attr' used by this command */ | |
685 | #define BPF_MAP_GET_NEXT_KEY_LAST_FIELD next_key | |
686 | ||
687 | static int map_get_next_key(union bpf_attr *attr) | |
688 | { | |
535e7b4b MS |
689 | void __user *ukey = u64_to_user_ptr(attr->key); |
690 | void __user *unext_key = u64_to_user_ptr(attr->next_key); | |
db20fd2b | 691 | int ufd = attr->map_fd; |
db20fd2b AS |
692 | struct bpf_map *map; |
693 | void *key, *next_key; | |
592867bf | 694 | struct fd f; |
db20fd2b AS |
695 | int err; |
696 | ||
697 | if (CHECK_ATTR(BPF_MAP_GET_NEXT_KEY)) | |
698 | return -EINVAL; | |
699 | ||
592867bf | 700 | f = fdget(ufd); |
c2101297 | 701 | map = __bpf_map_get(f); |
db20fd2b AS |
702 | if (IS_ERR(map)) |
703 | return PTR_ERR(map); | |
704 | ||
8fe45924 | 705 | if (ukey) { |
e4448ed8 AV |
706 | key = memdup_user(ukey, map->key_size); |
707 | if (IS_ERR(key)) { | |
708 | err = PTR_ERR(key); | |
8fe45924 | 709 | goto err_put; |
e4448ed8 | 710 | } |
8fe45924 TQ |
711 | } else { |
712 | key = NULL; | |
713 | } | |
db20fd2b AS |
714 | |
715 | err = -ENOMEM; | |
716 | next_key = kmalloc(map->key_size, GFP_USER); | |
717 | if (!next_key) | |
718 | goto free_key; | |
719 | ||
720 | rcu_read_lock(); | |
721 | err = map->ops->map_get_next_key(map, key, next_key); | |
722 | rcu_read_unlock(); | |
723 | if (err) | |
724 | goto free_next_key; | |
725 | ||
726 | err = -EFAULT; | |
727 | if (copy_to_user(unext_key, next_key, map->key_size) != 0) | |
728 | goto free_next_key; | |
729 | ||
a67edbf4 | 730 | trace_bpf_map_next_key(map, ufd, key, next_key); |
db20fd2b AS |
731 | err = 0; |
732 | ||
733 | free_next_key: | |
734 | kfree(next_key); | |
735 | free_key: | |
736 | kfree(key); | |
737 | err_put: | |
738 | fdput(f); | |
739 | return err; | |
740 | } | |
741 | ||
7de16e3a JK |
742 | static const struct bpf_prog_ops * const bpf_prog_types[] = { |
743 | #define BPF_PROG_TYPE(_id, _name) \ | |
744 | [_id] = & _name ## _prog_ops, | |
745 | #define BPF_MAP_TYPE(_id, _ops) | |
746 | #include <linux/bpf_types.h> | |
747 | #undef BPF_PROG_TYPE | |
748 | #undef BPF_MAP_TYPE | |
749 | }; | |
750 | ||
751 | static const struct bpf_verifier_ops * const bpf_verifier_ops[] = { | |
752 | #define BPF_PROG_TYPE(_id, _name) \ | |
753 | [_id] = & _name ## _verifier_ops, | |
40077e0c | 754 | #define BPF_MAP_TYPE(_id, _ops) |
be9370a7 JB |
755 | #include <linux/bpf_types.h> |
756 | #undef BPF_PROG_TYPE | |
40077e0c | 757 | #undef BPF_MAP_TYPE |
be9370a7 | 758 | }; |
09756af4 AS |
759 | |
760 | static int find_prog_type(enum bpf_prog_type type, struct bpf_prog *prog) | |
761 | { | |
be9370a7 JB |
762 | if (type >= ARRAY_SIZE(bpf_prog_types) || !bpf_prog_types[type]) |
763 | return -EINVAL; | |
09756af4 | 764 | |
be9370a7 | 765 | prog->aux->ops = bpf_prog_types[type]; |
7de16e3a | 766 | prog->aux->vops = bpf_verifier_ops[type]; |
be9370a7 JB |
767 | prog->type = type; |
768 | return 0; | |
09756af4 AS |
769 | } |
770 | ||
771 | /* drop refcnt on maps used by eBPF program and free auxilary data */ | |
772 | static void free_used_maps(struct bpf_prog_aux *aux) | |
773 | { | |
774 | int i; | |
775 | ||
776 | for (i = 0; i < aux->used_map_cnt; i++) | |
777 | bpf_map_put(aux->used_maps[i]); | |
778 | ||
779 | kfree(aux->used_maps); | |
780 | } | |
781 | ||
5ccb071e DB |
782 | int __bpf_prog_charge(struct user_struct *user, u32 pages) |
783 | { | |
784 | unsigned long memlock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
785 | unsigned long user_bufs; | |
786 | ||
787 | if (user) { | |
788 | user_bufs = atomic_long_add_return(pages, &user->locked_vm); | |
789 | if (user_bufs > memlock_limit) { | |
790 | atomic_long_sub(pages, &user->locked_vm); | |
791 | return -EPERM; | |
792 | } | |
793 | } | |
794 | ||
795 | return 0; | |
796 | } | |
797 | ||
798 | void __bpf_prog_uncharge(struct user_struct *user, u32 pages) | |
799 | { | |
800 | if (user) | |
801 | atomic_long_sub(pages, &user->locked_vm); | |
802 | } | |
803 | ||
aaac3ba9 AS |
804 | static int bpf_prog_charge_memlock(struct bpf_prog *prog) |
805 | { | |
806 | struct user_struct *user = get_current_user(); | |
5ccb071e | 807 | int ret; |
aaac3ba9 | 808 | |
5ccb071e DB |
809 | ret = __bpf_prog_charge(user, prog->pages); |
810 | if (ret) { | |
aaac3ba9 | 811 | free_uid(user); |
5ccb071e | 812 | return ret; |
aaac3ba9 | 813 | } |
5ccb071e | 814 | |
aaac3ba9 AS |
815 | prog->aux->user = user; |
816 | return 0; | |
817 | } | |
818 | ||
819 | static void bpf_prog_uncharge_memlock(struct bpf_prog *prog) | |
820 | { | |
821 | struct user_struct *user = prog->aux->user; | |
822 | ||
5ccb071e | 823 | __bpf_prog_uncharge(user, prog->pages); |
aaac3ba9 AS |
824 | free_uid(user); |
825 | } | |
826 | ||
dc4bb0e2 MKL |
827 | static int bpf_prog_alloc_id(struct bpf_prog *prog) |
828 | { | |
829 | int id; | |
830 | ||
831 | spin_lock_bh(&prog_idr_lock); | |
832 | id = idr_alloc_cyclic(&prog_idr, prog, 1, INT_MAX, GFP_ATOMIC); | |
833 | if (id > 0) | |
834 | prog->aux->id = id; | |
835 | spin_unlock_bh(&prog_idr_lock); | |
836 | ||
837 | /* id is in [1, INT_MAX) */ | |
838 | if (WARN_ON_ONCE(!id)) | |
839 | return -ENOSPC; | |
840 | ||
841 | return id > 0 ? 0 : id; | |
842 | } | |
843 | ||
b16d9aa4 | 844 | static void bpf_prog_free_id(struct bpf_prog *prog, bool do_idr_lock) |
dc4bb0e2 MKL |
845 | { |
846 | /* cBPF to eBPF migrations are currently not in the idr store. */ | |
847 | if (!prog->aux->id) | |
848 | return; | |
849 | ||
b16d9aa4 MKL |
850 | if (do_idr_lock) |
851 | spin_lock_bh(&prog_idr_lock); | |
852 | else | |
853 | __acquire(&prog_idr_lock); | |
854 | ||
dc4bb0e2 | 855 | idr_remove(&prog_idr, prog->aux->id); |
b16d9aa4 MKL |
856 | |
857 | if (do_idr_lock) | |
858 | spin_unlock_bh(&prog_idr_lock); | |
859 | else | |
860 | __release(&prog_idr_lock); | |
dc4bb0e2 MKL |
861 | } |
862 | ||
1aacde3d | 863 | static void __bpf_prog_put_rcu(struct rcu_head *rcu) |
abf2e7d6 AS |
864 | { |
865 | struct bpf_prog_aux *aux = container_of(rcu, struct bpf_prog_aux, rcu); | |
866 | ||
867 | free_used_maps(aux); | |
aaac3ba9 | 868 | bpf_prog_uncharge_memlock(aux->prog); |
abf2e7d6 AS |
869 | bpf_prog_free(aux->prog); |
870 | } | |
871 | ||
b16d9aa4 | 872 | static void __bpf_prog_put(struct bpf_prog *prog, bool do_idr_lock) |
09756af4 | 873 | { |
a67edbf4 DB |
874 | if (atomic_dec_and_test(&prog->aux->refcnt)) { |
875 | trace_bpf_prog_put_rcu(prog); | |
34ad5580 | 876 | /* bpf_prog_free_id() must be called first */ |
b16d9aa4 | 877 | bpf_prog_free_id(prog, do_idr_lock); |
74451e66 | 878 | bpf_prog_kallsyms_del(prog); |
1aacde3d | 879 | call_rcu(&prog->aux->rcu, __bpf_prog_put_rcu); |
a67edbf4 | 880 | } |
09756af4 | 881 | } |
b16d9aa4 MKL |
882 | |
883 | void bpf_prog_put(struct bpf_prog *prog) | |
884 | { | |
885 | __bpf_prog_put(prog, true); | |
886 | } | |
e2e9b654 | 887 | EXPORT_SYMBOL_GPL(bpf_prog_put); |
09756af4 AS |
888 | |
889 | static int bpf_prog_release(struct inode *inode, struct file *filp) | |
890 | { | |
891 | struct bpf_prog *prog = filp->private_data; | |
892 | ||
1aacde3d | 893 | bpf_prog_put(prog); |
09756af4 AS |
894 | return 0; |
895 | } | |
896 | ||
7bd509e3 DB |
897 | #ifdef CONFIG_PROC_FS |
898 | static void bpf_prog_show_fdinfo(struct seq_file *m, struct file *filp) | |
899 | { | |
900 | const struct bpf_prog *prog = filp->private_data; | |
f1f7714e | 901 | char prog_tag[sizeof(prog->tag) * 2 + 1] = { }; |
7bd509e3 | 902 | |
f1f7714e | 903 | bin2hex(prog_tag, prog->tag, sizeof(prog->tag)); |
7bd509e3 DB |
904 | seq_printf(m, |
905 | "prog_type:\t%u\n" | |
906 | "prog_jited:\t%u\n" | |
f1f7714e | 907 | "prog_tag:\t%s\n" |
7bd509e3 DB |
908 | "memlock:\t%llu\n", |
909 | prog->type, | |
910 | prog->jited, | |
f1f7714e | 911 | prog_tag, |
7bd509e3 DB |
912 | prog->pages * 1ULL << PAGE_SHIFT); |
913 | } | |
914 | #endif | |
915 | ||
09756af4 | 916 | static const struct file_operations bpf_prog_fops = { |
7bd509e3 DB |
917 | #ifdef CONFIG_PROC_FS |
918 | .show_fdinfo = bpf_prog_show_fdinfo, | |
919 | #endif | |
920 | .release = bpf_prog_release, | |
09756af4 AS |
921 | }; |
922 | ||
b2197755 | 923 | int bpf_prog_new_fd(struct bpf_prog *prog) |
aa79781b DB |
924 | { |
925 | return anon_inode_getfd("bpf-prog", &bpf_prog_fops, prog, | |
926 | O_RDWR | O_CLOEXEC); | |
927 | } | |
928 | ||
113214be | 929 | static struct bpf_prog *____bpf_prog_get(struct fd f) |
09756af4 | 930 | { |
09756af4 AS |
931 | if (!f.file) |
932 | return ERR_PTR(-EBADF); | |
09756af4 AS |
933 | if (f.file->f_op != &bpf_prog_fops) { |
934 | fdput(f); | |
935 | return ERR_PTR(-EINVAL); | |
936 | } | |
937 | ||
c2101297 | 938 | return f.file->private_data; |
09756af4 AS |
939 | } |
940 | ||
59d3656d | 941 | struct bpf_prog *bpf_prog_add(struct bpf_prog *prog, int i) |
92117d84 | 942 | { |
59d3656d BB |
943 | if (atomic_add_return(i, &prog->aux->refcnt) > BPF_MAX_REFCNT) { |
944 | atomic_sub(i, &prog->aux->refcnt); | |
92117d84 AS |
945 | return ERR_PTR(-EBUSY); |
946 | } | |
947 | return prog; | |
948 | } | |
59d3656d BB |
949 | EXPORT_SYMBOL_GPL(bpf_prog_add); |
950 | ||
c540594f DB |
951 | void bpf_prog_sub(struct bpf_prog *prog, int i) |
952 | { | |
953 | /* Only to be used for undoing previous bpf_prog_add() in some | |
954 | * error path. We still know that another entity in our call | |
955 | * path holds a reference to the program, thus atomic_sub() can | |
956 | * be safely used in such cases! | |
957 | */ | |
958 | WARN_ON(atomic_sub_return(i, &prog->aux->refcnt) == 0); | |
959 | } | |
960 | EXPORT_SYMBOL_GPL(bpf_prog_sub); | |
961 | ||
59d3656d BB |
962 | struct bpf_prog *bpf_prog_inc(struct bpf_prog *prog) |
963 | { | |
964 | return bpf_prog_add(prog, 1); | |
965 | } | |
97bc402d | 966 | EXPORT_SYMBOL_GPL(bpf_prog_inc); |
92117d84 | 967 | |
b16d9aa4 | 968 | /* prog_idr_lock should have been held */ |
a6f6df69 | 969 | struct bpf_prog *bpf_prog_inc_not_zero(struct bpf_prog *prog) |
b16d9aa4 MKL |
970 | { |
971 | int refold; | |
972 | ||
973 | refold = __atomic_add_unless(&prog->aux->refcnt, 1, 0); | |
974 | ||
975 | if (refold >= BPF_MAX_REFCNT) { | |
976 | __bpf_prog_put(prog, false); | |
977 | return ERR_PTR(-EBUSY); | |
978 | } | |
979 | ||
980 | if (!refold) | |
981 | return ERR_PTR(-ENOENT); | |
982 | ||
983 | return prog; | |
984 | } | |
a6f6df69 | 985 | EXPORT_SYMBOL_GPL(bpf_prog_inc_not_zero); |
b16d9aa4 | 986 | |
113214be | 987 | static struct bpf_prog *__bpf_prog_get(u32 ufd, enum bpf_prog_type *type) |
09756af4 AS |
988 | { |
989 | struct fd f = fdget(ufd); | |
990 | struct bpf_prog *prog; | |
991 | ||
113214be | 992 | prog = ____bpf_prog_get(f); |
09756af4 AS |
993 | if (IS_ERR(prog)) |
994 | return prog; | |
113214be DB |
995 | if (type && prog->type != *type) { |
996 | prog = ERR_PTR(-EINVAL); | |
997 | goto out; | |
998 | } | |
09756af4 | 999 | |
92117d84 | 1000 | prog = bpf_prog_inc(prog); |
113214be | 1001 | out: |
09756af4 AS |
1002 | fdput(f); |
1003 | return prog; | |
1004 | } | |
113214be DB |
1005 | |
1006 | struct bpf_prog *bpf_prog_get(u32 ufd) | |
1007 | { | |
1008 | return __bpf_prog_get(ufd, NULL); | |
1009 | } | |
1010 | ||
1011 | struct bpf_prog *bpf_prog_get_type(u32 ufd, enum bpf_prog_type type) | |
1012 | { | |
a67edbf4 DB |
1013 | struct bpf_prog *prog = __bpf_prog_get(ufd, &type); |
1014 | ||
1015 | if (!IS_ERR(prog)) | |
1016 | trace_bpf_prog_get_type(prog); | |
1017 | return prog; | |
113214be DB |
1018 | } |
1019 | EXPORT_SYMBOL_GPL(bpf_prog_get_type); | |
09756af4 AS |
1020 | |
1021 | /* last field in 'union bpf_attr' used by this command */ | |
cb4d2b3f | 1022 | #define BPF_PROG_LOAD_LAST_FIELD prog_name |
09756af4 AS |
1023 | |
1024 | static int bpf_prog_load(union bpf_attr *attr) | |
1025 | { | |
1026 | enum bpf_prog_type type = attr->prog_type; | |
1027 | struct bpf_prog *prog; | |
1028 | int err; | |
1029 | char license[128]; | |
1030 | bool is_gpl; | |
1031 | ||
1032 | if (CHECK_ATTR(BPF_PROG_LOAD)) | |
1033 | return -EINVAL; | |
1034 | ||
e07b98d9 DM |
1035 | if (attr->prog_flags & ~BPF_F_STRICT_ALIGNMENT) |
1036 | return -EINVAL; | |
1037 | ||
09756af4 | 1038 | /* copy eBPF program license from user space */ |
535e7b4b | 1039 | if (strncpy_from_user(license, u64_to_user_ptr(attr->license), |
09756af4 AS |
1040 | sizeof(license) - 1) < 0) |
1041 | return -EFAULT; | |
1042 | license[sizeof(license) - 1] = 0; | |
1043 | ||
1044 | /* eBPF programs must be GPL compatible to use GPL-ed functions */ | |
1045 | is_gpl = license_is_gpl_compatible(license); | |
1046 | ||
ef0915ca DB |
1047 | if (attr->insn_cnt == 0 || attr->insn_cnt > BPF_MAXINSNS) |
1048 | return -E2BIG; | |
09756af4 | 1049 | |
2541517c AS |
1050 | if (type == BPF_PROG_TYPE_KPROBE && |
1051 | attr->kern_version != LINUX_VERSION_CODE) | |
1052 | return -EINVAL; | |
1053 | ||
80b7d819 CF |
1054 | if (type != BPF_PROG_TYPE_SOCKET_FILTER && |
1055 | type != BPF_PROG_TYPE_CGROUP_SKB && | |
1056 | !capable(CAP_SYS_ADMIN)) | |
1be7f75d AS |
1057 | return -EPERM; |
1058 | ||
09756af4 AS |
1059 | /* plain bpf_prog allocation */ |
1060 | prog = bpf_prog_alloc(bpf_prog_size(attr->insn_cnt), GFP_USER); | |
1061 | if (!prog) | |
1062 | return -ENOMEM; | |
1063 | ||
aaac3ba9 AS |
1064 | err = bpf_prog_charge_memlock(prog); |
1065 | if (err) | |
1066 | goto free_prog_nouncharge; | |
1067 | ||
09756af4 AS |
1068 | prog->len = attr->insn_cnt; |
1069 | ||
1070 | err = -EFAULT; | |
535e7b4b | 1071 | if (copy_from_user(prog->insns, u64_to_user_ptr(attr->insns), |
aafe6ae9 | 1072 | bpf_prog_insn_size(prog)) != 0) |
09756af4 AS |
1073 | goto free_prog; |
1074 | ||
1075 | prog->orig_prog = NULL; | |
a91263d5 | 1076 | prog->jited = 0; |
09756af4 AS |
1077 | |
1078 | atomic_set(&prog->aux->refcnt, 1); | |
a91263d5 | 1079 | prog->gpl_compatible = is_gpl ? 1 : 0; |
09756af4 AS |
1080 | |
1081 | /* find program type: socket_filter vs tracing_filter */ | |
1082 | err = find_prog_type(type, prog); | |
1083 | if (err < 0) | |
1084 | goto free_prog; | |
1085 | ||
cb4d2b3f MKL |
1086 | prog->aux->load_time = ktime_get_boot_ns(); |
1087 | err = bpf_obj_name_cpy(prog->aux->name, attr->prog_name); | |
1088 | if (err) | |
1089 | goto free_prog; | |
1090 | ||
09756af4 | 1091 | /* run eBPF verifier */ |
9bac3d6d | 1092 | err = bpf_check(&prog, attr); |
09756af4 AS |
1093 | if (err < 0) |
1094 | goto free_used_maps; | |
1095 | ||
1096 | /* eBPF program is ready to be JITed */ | |
d1c55ab5 | 1097 | prog = bpf_prog_select_runtime(prog, &err); |
04fd61ab AS |
1098 | if (err < 0) |
1099 | goto free_used_maps; | |
09756af4 | 1100 | |
dc4bb0e2 MKL |
1101 | err = bpf_prog_alloc_id(prog); |
1102 | if (err) | |
1103 | goto free_used_maps; | |
1104 | ||
aa79781b | 1105 | err = bpf_prog_new_fd(prog); |
b16d9aa4 MKL |
1106 | if (err < 0) { |
1107 | /* failed to allocate fd. | |
1108 | * bpf_prog_put() is needed because the above | |
1109 | * bpf_prog_alloc_id() has published the prog | |
1110 | * to the userspace and the userspace may | |
1111 | * have refcnt-ed it through BPF_PROG_GET_FD_BY_ID. | |
1112 | */ | |
1113 | bpf_prog_put(prog); | |
1114 | return err; | |
1115 | } | |
09756af4 | 1116 | |
74451e66 | 1117 | bpf_prog_kallsyms_add(prog); |
a67edbf4 | 1118 | trace_bpf_prog_load(prog, err); |
09756af4 AS |
1119 | return err; |
1120 | ||
1121 | free_used_maps: | |
1122 | free_used_maps(prog->aux); | |
1123 | free_prog: | |
aaac3ba9 AS |
1124 | bpf_prog_uncharge_memlock(prog); |
1125 | free_prog_nouncharge: | |
09756af4 AS |
1126 | bpf_prog_free(prog); |
1127 | return err; | |
1128 | } | |
1129 | ||
b2197755 DB |
1130 | #define BPF_OBJ_LAST_FIELD bpf_fd |
1131 | ||
1132 | static int bpf_obj_pin(const union bpf_attr *attr) | |
1133 | { | |
1134 | if (CHECK_ATTR(BPF_OBJ)) | |
1135 | return -EINVAL; | |
1136 | ||
535e7b4b | 1137 | return bpf_obj_pin_user(attr->bpf_fd, u64_to_user_ptr(attr->pathname)); |
b2197755 DB |
1138 | } |
1139 | ||
1140 | static int bpf_obj_get(const union bpf_attr *attr) | |
1141 | { | |
1142 | if (CHECK_ATTR(BPF_OBJ) || attr->bpf_fd != 0) | |
1143 | return -EINVAL; | |
1144 | ||
535e7b4b | 1145 | return bpf_obj_get_user(u64_to_user_ptr(attr->pathname)); |
b2197755 DB |
1146 | } |
1147 | ||
f4324551 DM |
1148 | #ifdef CONFIG_CGROUP_BPF |
1149 | ||
464bc0fd | 1150 | #define BPF_PROG_ATTACH_LAST_FIELD attach_flags |
174a79ff | 1151 | |
5a67da2a | 1152 | static int sockmap_get_from_fd(const union bpf_attr *attr, bool attach) |
174a79ff | 1153 | { |
5a67da2a | 1154 | struct bpf_prog *prog = NULL; |
174a79ff JF |
1155 | int ufd = attr->target_fd; |
1156 | struct bpf_map *map; | |
1157 | struct fd f; | |
1158 | int err; | |
1159 | ||
1160 | f = fdget(ufd); | |
1161 | map = __bpf_map_get(f); | |
1162 | if (IS_ERR(map)) | |
1163 | return PTR_ERR(map); | |
1164 | ||
5a67da2a JF |
1165 | if (attach) { |
1166 | prog = bpf_prog_get_type(attr->attach_bpf_fd, | |
1167 | BPF_PROG_TYPE_SK_SKB); | |
1168 | if (IS_ERR(prog)) { | |
1169 | fdput(f); | |
1170 | return PTR_ERR(prog); | |
1171 | } | |
174a79ff JF |
1172 | } |
1173 | ||
5a67da2a | 1174 | err = sock_map_prog(map, prog, attr->attach_type); |
174a79ff JF |
1175 | if (err) { |
1176 | fdput(f); | |
5a67da2a JF |
1177 | if (prog) |
1178 | bpf_prog_put(prog); | |
ae2b27b8 | 1179 | return err; |
174a79ff JF |
1180 | } |
1181 | ||
1182 | fdput(f); | |
ae2b27b8 | 1183 | return 0; |
174a79ff | 1184 | } |
f4324551 | 1185 | |
324bda9e AS |
1186 | #define BPF_F_ATTACH_MASK \ |
1187 | (BPF_F_ALLOW_OVERRIDE | BPF_F_ALLOW_MULTI) | |
1188 | ||
f4324551 DM |
1189 | static int bpf_prog_attach(const union bpf_attr *attr) |
1190 | { | |
7f677633 | 1191 | enum bpf_prog_type ptype; |
f4324551 DM |
1192 | struct bpf_prog *prog; |
1193 | struct cgroup *cgrp; | |
7f677633 | 1194 | int ret; |
f4324551 DM |
1195 | |
1196 | if (!capable(CAP_NET_ADMIN)) | |
1197 | return -EPERM; | |
1198 | ||
1199 | if (CHECK_ATTR(BPF_PROG_ATTACH)) | |
1200 | return -EINVAL; | |
1201 | ||
324bda9e | 1202 | if (attr->attach_flags & ~BPF_F_ATTACH_MASK) |
7f677633 AS |
1203 | return -EINVAL; |
1204 | ||
f4324551 DM |
1205 | switch (attr->attach_type) { |
1206 | case BPF_CGROUP_INET_INGRESS: | |
1207 | case BPF_CGROUP_INET_EGRESS: | |
b2cd1257 | 1208 | ptype = BPF_PROG_TYPE_CGROUP_SKB; |
f4324551 | 1209 | break; |
61023658 DA |
1210 | case BPF_CGROUP_INET_SOCK_CREATE: |
1211 | ptype = BPF_PROG_TYPE_CGROUP_SOCK; | |
1212 | break; | |
40304b2a LB |
1213 | case BPF_CGROUP_SOCK_OPS: |
1214 | ptype = BPF_PROG_TYPE_SOCK_OPS; | |
1215 | break; | |
464bc0fd JF |
1216 | case BPF_SK_SKB_STREAM_PARSER: |
1217 | case BPF_SK_SKB_STREAM_VERDICT: | |
5a67da2a | 1218 | return sockmap_get_from_fd(attr, true); |
f4324551 DM |
1219 | default: |
1220 | return -EINVAL; | |
1221 | } | |
1222 | ||
b2cd1257 DA |
1223 | prog = bpf_prog_get_type(attr->attach_bpf_fd, ptype); |
1224 | if (IS_ERR(prog)) | |
1225 | return PTR_ERR(prog); | |
1226 | ||
1227 | cgrp = cgroup_get_from_fd(attr->target_fd); | |
1228 | if (IS_ERR(cgrp)) { | |
1229 | bpf_prog_put(prog); | |
1230 | return PTR_ERR(cgrp); | |
1231 | } | |
1232 | ||
324bda9e AS |
1233 | ret = cgroup_bpf_attach(cgrp, prog, attr->attach_type, |
1234 | attr->attach_flags); | |
7f677633 AS |
1235 | if (ret) |
1236 | bpf_prog_put(prog); | |
b2cd1257 DA |
1237 | cgroup_put(cgrp); |
1238 | ||
7f677633 | 1239 | return ret; |
f4324551 DM |
1240 | } |
1241 | ||
1242 | #define BPF_PROG_DETACH_LAST_FIELD attach_type | |
1243 | ||
1244 | static int bpf_prog_detach(const union bpf_attr *attr) | |
1245 | { | |
324bda9e AS |
1246 | enum bpf_prog_type ptype; |
1247 | struct bpf_prog *prog; | |
f4324551 | 1248 | struct cgroup *cgrp; |
7f677633 | 1249 | int ret; |
f4324551 DM |
1250 | |
1251 | if (!capable(CAP_NET_ADMIN)) | |
1252 | return -EPERM; | |
1253 | ||
1254 | if (CHECK_ATTR(BPF_PROG_DETACH)) | |
1255 | return -EINVAL; | |
1256 | ||
1257 | switch (attr->attach_type) { | |
1258 | case BPF_CGROUP_INET_INGRESS: | |
1259 | case BPF_CGROUP_INET_EGRESS: | |
324bda9e AS |
1260 | ptype = BPF_PROG_TYPE_CGROUP_SKB; |
1261 | break; | |
61023658 | 1262 | case BPF_CGROUP_INET_SOCK_CREATE: |
324bda9e AS |
1263 | ptype = BPF_PROG_TYPE_CGROUP_SOCK; |
1264 | break; | |
40304b2a | 1265 | case BPF_CGROUP_SOCK_OPS: |
324bda9e | 1266 | ptype = BPF_PROG_TYPE_SOCK_OPS; |
f4324551 | 1267 | break; |
5a67da2a JF |
1268 | case BPF_SK_SKB_STREAM_PARSER: |
1269 | case BPF_SK_SKB_STREAM_VERDICT: | |
324bda9e | 1270 | return sockmap_get_from_fd(attr, false); |
f4324551 DM |
1271 | default: |
1272 | return -EINVAL; | |
1273 | } | |
1274 | ||
324bda9e AS |
1275 | cgrp = cgroup_get_from_fd(attr->target_fd); |
1276 | if (IS_ERR(cgrp)) | |
1277 | return PTR_ERR(cgrp); | |
1278 | ||
1279 | prog = bpf_prog_get_type(attr->attach_bpf_fd, ptype); | |
1280 | if (IS_ERR(prog)) | |
1281 | prog = NULL; | |
1282 | ||
1283 | ret = cgroup_bpf_detach(cgrp, prog, attr->attach_type, 0); | |
1284 | if (prog) | |
1285 | bpf_prog_put(prog); | |
1286 | cgroup_put(cgrp); | |
7f677633 | 1287 | return ret; |
f4324551 | 1288 | } |
40304b2a | 1289 | |
468e2f64 AS |
1290 | #define BPF_PROG_QUERY_LAST_FIELD query.prog_cnt |
1291 | ||
1292 | static int bpf_prog_query(const union bpf_attr *attr, | |
1293 | union bpf_attr __user *uattr) | |
1294 | { | |
1295 | struct cgroup *cgrp; | |
1296 | int ret; | |
1297 | ||
1298 | if (!capable(CAP_NET_ADMIN)) | |
1299 | return -EPERM; | |
1300 | if (CHECK_ATTR(BPF_PROG_QUERY)) | |
1301 | return -EINVAL; | |
1302 | if (attr->query.query_flags & ~BPF_F_QUERY_EFFECTIVE) | |
1303 | return -EINVAL; | |
1304 | ||
1305 | switch (attr->query.attach_type) { | |
1306 | case BPF_CGROUP_INET_INGRESS: | |
1307 | case BPF_CGROUP_INET_EGRESS: | |
1308 | case BPF_CGROUP_INET_SOCK_CREATE: | |
1309 | case BPF_CGROUP_SOCK_OPS: | |
1310 | break; | |
1311 | default: | |
1312 | return -EINVAL; | |
1313 | } | |
1314 | cgrp = cgroup_get_from_fd(attr->query.target_fd); | |
1315 | if (IS_ERR(cgrp)) | |
1316 | return PTR_ERR(cgrp); | |
1317 | ret = cgroup_bpf_query(cgrp, attr, uattr); | |
1318 | cgroup_put(cgrp); | |
1319 | return ret; | |
1320 | } | |
f4324551 DM |
1321 | #endif /* CONFIG_CGROUP_BPF */ |
1322 | ||
1cf1cae9 AS |
1323 | #define BPF_PROG_TEST_RUN_LAST_FIELD test.duration |
1324 | ||
1325 | static int bpf_prog_test_run(const union bpf_attr *attr, | |
1326 | union bpf_attr __user *uattr) | |
1327 | { | |
1328 | struct bpf_prog *prog; | |
1329 | int ret = -ENOTSUPP; | |
1330 | ||
1331 | if (CHECK_ATTR(BPF_PROG_TEST_RUN)) | |
1332 | return -EINVAL; | |
1333 | ||
1334 | prog = bpf_prog_get(attr->test.prog_fd); | |
1335 | if (IS_ERR(prog)) | |
1336 | return PTR_ERR(prog); | |
1337 | ||
1338 | if (prog->aux->ops->test_run) | |
1339 | ret = prog->aux->ops->test_run(prog, attr, uattr); | |
1340 | ||
1341 | bpf_prog_put(prog); | |
1342 | return ret; | |
1343 | } | |
1344 | ||
34ad5580 MKL |
1345 | #define BPF_OBJ_GET_NEXT_ID_LAST_FIELD next_id |
1346 | ||
1347 | static int bpf_obj_get_next_id(const union bpf_attr *attr, | |
1348 | union bpf_attr __user *uattr, | |
1349 | struct idr *idr, | |
1350 | spinlock_t *lock) | |
1351 | { | |
1352 | u32 next_id = attr->start_id; | |
1353 | int err = 0; | |
1354 | ||
1355 | if (CHECK_ATTR(BPF_OBJ_GET_NEXT_ID) || next_id >= INT_MAX) | |
1356 | return -EINVAL; | |
1357 | ||
1358 | if (!capable(CAP_SYS_ADMIN)) | |
1359 | return -EPERM; | |
1360 | ||
1361 | next_id++; | |
1362 | spin_lock_bh(lock); | |
1363 | if (!idr_get_next(idr, &next_id)) | |
1364 | err = -ENOENT; | |
1365 | spin_unlock_bh(lock); | |
1366 | ||
1367 | if (!err) | |
1368 | err = put_user(next_id, &uattr->next_id); | |
1369 | ||
1370 | return err; | |
1371 | } | |
1372 | ||
b16d9aa4 MKL |
1373 | #define BPF_PROG_GET_FD_BY_ID_LAST_FIELD prog_id |
1374 | ||
1375 | static int bpf_prog_get_fd_by_id(const union bpf_attr *attr) | |
1376 | { | |
1377 | struct bpf_prog *prog; | |
1378 | u32 id = attr->prog_id; | |
1379 | int fd; | |
1380 | ||
1381 | if (CHECK_ATTR(BPF_PROG_GET_FD_BY_ID)) | |
1382 | return -EINVAL; | |
1383 | ||
1384 | if (!capable(CAP_SYS_ADMIN)) | |
1385 | return -EPERM; | |
1386 | ||
1387 | spin_lock_bh(&prog_idr_lock); | |
1388 | prog = idr_find(&prog_idr, id); | |
1389 | if (prog) | |
1390 | prog = bpf_prog_inc_not_zero(prog); | |
1391 | else | |
1392 | prog = ERR_PTR(-ENOENT); | |
1393 | spin_unlock_bh(&prog_idr_lock); | |
1394 | ||
1395 | if (IS_ERR(prog)) | |
1396 | return PTR_ERR(prog); | |
1397 | ||
1398 | fd = bpf_prog_new_fd(prog); | |
1399 | if (fd < 0) | |
1400 | bpf_prog_put(prog); | |
1401 | ||
1402 | return fd; | |
1403 | } | |
1404 | ||
bd5f5f4e MKL |
1405 | #define BPF_MAP_GET_FD_BY_ID_LAST_FIELD map_id |
1406 | ||
1407 | static int bpf_map_get_fd_by_id(const union bpf_attr *attr) | |
1408 | { | |
1409 | struct bpf_map *map; | |
1410 | u32 id = attr->map_id; | |
1411 | int fd; | |
1412 | ||
1413 | if (CHECK_ATTR(BPF_MAP_GET_FD_BY_ID)) | |
1414 | return -EINVAL; | |
1415 | ||
1416 | if (!capable(CAP_SYS_ADMIN)) | |
1417 | return -EPERM; | |
1418 | ||
1419 | spin_lock_bh(&map_idr_lock); | |
1420 | map = idr_find(&map_idr, id); | |
1421 | if (map) | |
1422 | map = bpf_map_inc_not_zero(map, true); | |
1423 | else | |
1424 | map = ERR_PTR(-ENOENT); | |
1425 | spin_unlock_bh(&map_idr_lock); | |
1426 | ||
1427 | if (IS_ERR(map)) | |
1428 | return PTR_ERR(map); | |
1429 | ||
1430 | fd = bpf_map_new_fd(map); | |
1431 | if (fd < 0) | |
1432 | bpf_map_put(map); | |
1433 | ||
1434 | return fd; | |
1435 | } | |
1436 | ||
1e270976 MKL |
1437 | static int bpf_prog_get_info_by_fd(struct bpf_prog *prog, |
1438 | const union bpf_attr *attr, | |
1439 | union bpf_attr __user *uattr) | |
1440 | { | |
1441 | struct bpf_prog_info __user *uinfo = u64_to_user_ptr(attr->info.info); | |
1442 | struct bpf_prog_info info = {}; | |
1443 | u32 info_len = attr->info.info_len; | |
1444 | char __user *uinsns; | |
1445 | u32 ulen; | |
1446 | int err; | |
1447 | ||
1448 | err = check_uarg_tail_zero(uinfo, sizeof(info), info_len); | |
1449 | if (err) | |
1450 | return err; | |
1451 | info_len = min_t(u32, sizeof(info), info_len); | |
1452 | ||
1453 | if (copy_from_user(&info, uinfo, info_len)) | |
89b09689 | 1454 | return -EFAULT; |
1e270976 MKL |
1455 | |
1456 | info.type = prog->type; | |
1457 | info.id = prog->aux->id; | |
cb4d2b3f MKL |
1458 | info.load_time = prog->aux->load_time; |
1459 | info.created_by_uid = from_kuid_munged(current_user_ns(), | |
1460 | prog->aux->user->uid); | |
1e270976 MKL |
1461 | |
1462 | memcpy(info.tag, prog->tag, sizeof(prog->tag)); | |
cb4d2b3f MKL |
1463 | memcpy(info.name, prog->aux->name, sizeof(prog->aux->name)); |
1464 | ||
1465 | ulen = info.nr_map_ids; | |
1466 | info.nr_map_ids = prog->aux->used_map_cnt; | |
1467 | ulen = min_t(u32, info.nr_map_ids, ulen); | |
1468 | if (ulen) { | |
721e08da | 1469 | u32 __user *user_map_ids = u64_to_user_ptr(info.map_ids); |
cb4d2b3f MKL |
1470 | u32 i; |
1471 | ||
1472 | for (i = 0; i < ulen; i++) | |
1473 | if (put_user(prog->aux->used_maps[i]->id, | |
1474 | &user_map_ids[i])) | |
1475 | return -EFAULT; | |
1476 | } | |
1e270976 MKL |
1477 | |
1478 | if (!capable(CAP_SYS_ADMIN)) { | |
1479 | info.jited_prog_len = 0; | |
1480 | info.xlated_prog_len = 0; | |
1481 | goto done; | |
1482 | } | |
1483 | ||
1484 | ulen = info.jited_prog_len; | |
1485 | info.jited_prog_len = prog->jited_len; | |
1486 | if (info.jited_prog_len && ulen) { | |
1487 | uinsns = u64_to_user_ptr(info.jited_prog_insns); | |
1488 | ulen = min_t(u32, info.jited_prog_len, ulen); | |
1489 | if (copy_to_user(uinsns, prog->bpf_func, ulen)) | |
1490 | return -EFAULT; | |
1491 | } | |
1492 | ||
1493 | ulen = info.xlated_prog_len; | |
9975a54b | 1494 | info.xlated_prog_len = bpf_prog_insn_size(prog); |
1e270976 MKL |
1495 | if (info.xlated_prog_len && ulen) { |
1496 | uinsns = u64_to_user_ptr(info.xlated_prog_insns); | |
1497 | ulen = min_t(u32, info.xlated_prog_len, ulen); | |
1498 | if (copy_to_user(uinsns, prog->insnsi, ulen)) | |
1499 | return -EFAULT; | |
1500 | } | |
1501 | ||
1502 | done: | |
1503 | if (copy_to_user(uinfo, &info, info_len) || | |
1504 | put_user(info_len, &uattr->info.info_len)) | |
1505 | return -EFAULT; | |
1506 | ||
1507 | return 0; | |
1508 | } | |
1509 | ||
1510 | static int bpf_map_get_info_by_fd(struct bpf_map *map, | |
1511 | const union bpf_attr *attr, | |
1512 | union bpf_attr __user *uattr) | |
1513 | { | |
1514 | struct bpf_map_info __user *uinfo = u64_to_user_ptr(attr->info.info); | |
1515 | struct bpf_map_info info = {}; | |
1516 | u32 info_len = attr->info.info_len; | |
1517 | int err; | |
1518 | ||
1519 | err = check_uarg_tail_zero(uinfo, sizeof(info), info_len); | |
1520 | if (err) | |
1521 | return err; | |
1522 | info_len = min_t(u32, sizeof(info), info_len); | |
1523 | ||
1524 | info.type = map->map_type; | |
1525 | info.id = map->id; | |
1526 | info.key_size = map->key_size; | |
1527 | info.value_size = map->value_size; | |
1528 | info.max_entries = map->max_entries; | |
1529 | info.map_flags = map->map_flags; | |
ad5b177b | 1530 | memcpy(info.name, map->name, sizeof(map->name)); |
1e270976 MKL |
1531 | |
1532 | if (copy_to_user(uinfo, &info, info_len) || | |
1533 | put_user(info_len, &uattr->info.info_len)) | |
1534 | return -EFAULT; | |
1535 | ||
1536 | return 0; | |
1537 | } | |
1538 | ||
1539 | #define BPF_OBJ_GET_INFO_BY_FD_LAST_FIELD info.info | |
1540 | ||
1541 | static int bpf_obj_get_info_by_fd(const union bpf_attr *attr, | |
1542 | union bpf_attr __user *uattr) | |
1543 | { | |
1544 | int ufd = attr->info.bpf_fd; | |
1545 | struct fd f; | |
1546 | int err; | |
1547 | ||
1548 | if (CHECK_ATTR(BPF_OBJ_GET_INFO_BY_FD)) | |
1549 | return -EINVAL; | |
1550 | ||
1551 | f = fdget(ufd); | |
1552 | if (!f.file) | |
1553 | return -EBADFD; | |
1554 | ||
1555 | if (f.file->f_op == &bpf_prog_fops) | |
1556 | err = bpf_prog_get_info_by_fd(f.file->private_data, attr, | |
1557 | uattr); | |
1558 | else if (f.file->f_op == &bpf_map_fops) | |
1559 | err = bpf_map_get_info_by_fd(f.file->private_data, attr, | |
1560 | uattr); | |
1561 | else | |
1562 | err = -EINVAL; | |
1563 | ||
1564 | fdput(f); | |
1565 | return err; | |
1566 | } | |
1567 | ||
99c55f7d AS |
1568 | SYSCALL_DEFINE3(bpf, int, cmd, union bpf_attr __user *, uattr, unsigned int, size) |
1569 | { | |
1570 | union bpf_attr attr = {}; | |
1571 | int err; | |
1572 | ||
1be7f75d | 1573 | if (!capable(CAP_SYS_ADMIN) && sysctl_unprivileged_bpf_disabled) |
99c55f7d AS |
1574 | return -EPERM; |
1575 | ||
1e270976 MKL |
1576 | err = check_uarg_tail_zero(uattr, sizeof(attr), size); |
1577 | if (err) | |
1578 | return err; | |
1579 | size = min_t(u32, size, sizeof(attr)); | |
99c55f7d AS |
1580 | |
1581 | /* copy attributes from user space, may be less than sizeof(bpf_attr) */ | |
1582 | if (copy_from_user(&attr, uattr, size) != 0) | |
1583 | return -EFAULT; | |
1584 | ||
1585 | switch (cmd) { | |
1586 | case BPF_MAP_CREATE: | |
1587 | err = map_create(&attr); | |
1588 | break; | |
db20fd2b AS |
1589 | case BPF_MAP_LOOKUP_ELEM: |
1590 | err = map_lookup_elem(&attr); | |
1591 | break; | |
1592 | case BPF_MAP_UPDATE_ELEM: | |
1593 | err = map_update_elem(&attr); | |
1594 | break; | |
1595 | case BPF_MAP_DELETE_ELEM: | |
1596 | err = map_delete_elem(&attr); | |
1597 | break; | |
1598 | case BPF_MAP_GET_NEXT_KEY: | |
1599 | err = map_get_next_key(&attr); | |
1600 | break; | |
09756af4 AS |
1601 | case BPF_PROG_LOAD: |
1602 | err = bpf_prog_load(&attr); | |
1603 | break; | |
b2197755 DB |
1604 | case BPF_OBJ_PIN: |
1605 | err = bpf_obj_pin(&attr); | |
1606 | break; | |
1607 | case BPF_OBJ_GET: | |
1608 | err = bpf_obj_get(&attr); | |
1609 | break; | |
f4324551 DM |
1610 | #ifdef CONFIG_CGROUP_BPF |
1611 | case BPF_PROG_ATTACH: | |
1612 | err = bpf_prog_attach(&attr); | |
1613 | break; | |
1614 | case BPF_PROG_DETACH: | |
1615 | err = bpf_prog_detach(&attr); | |
1616 | break; | |
468e2f64 AS |
1617 | case BPF_PROG_QUERY: |
1618 | err = bpf_prog_query(&attr, uattr); | |
1619 | break; | |
f4324551 | 1620 | #endif |
1cf1cae9 AS |
1621 | case BPF_PROG_TEST_RUN: |
1622 | err = bpf_prog_test_run(&attr, uattr); | |
1623 | break; | |
34ad5580 MKL |
1624 | case BPF_PROG_GET_NEXT_ID: |
1625 | err = bpf_obj_get_next_id(&attr, uattr, | |
1626 | &prog_idr, &prog_idr_lock); | |
1627 | break; | |
1628 | case BPF_MAP_GET_NEXT_ID: | |
1629 | err = bpf_obj_get_next_id(&attr, uattr, | |
1630 | &map_idr, &map_idr_lock); | |
1631 | break; | |
b16d9aa4 MKL |
1632 | case BPF_PROG_GET_FD_BY_ID: |
1633 | err = bpf_prog_get_fd_by_id(&attr); | |
1634 | break; | |
bd5f5f4e MKL |
1635 | case BPF_MAP_GET_FD_BY_ID: |
1636 | err = bpf_map_get_fd_by_id(&attr); | |
1637 | break; | |
1e270976 MKL |
1638 | case BPF_OBJ_GET_INFO_BY_FD: |
1639 | err = bpf_obj_get_info_by_fd(&attr, uattr); | |
1640 | break; | |
99c55f7d AS |
1641 | default: |
1642 | err = -EINVAL; | |
1643 | break; | |
1644 | } | |
1645 | ||
1646 | return err; | |
1647 | } |