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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> |
f4364dcf | 14 | #include <linux/bpf_lirc.h> |
f56a653c | 15 | #include <linux/btf.h> |
99c55f7d AS |
16 | #include <linux/syscalls.h> |
17 | #include <linux/slab.h> | |
3f07c014 | 18 | #include <linux/sched/signal.h> |
d407bd25 DB |
19 | #include <linux/vmalloc.h> |
20 | #include <linux/mmzone.h> | |
99c55f7d | 21 | #include <linux/anon_inodes.h> |
41bdc4b4 | 22 | #include <linux/fdtable.h> |
db20fd2b | 23 | #include <linux/file.h> |
41bdc4b4 | 24 | #include <linux/fs.h> |
09756af4 AS |
25 | #include <linux/license.h> |
26 | #include <linux/filter.h> | |
2541517c | 27 | #include <linux/version.h> |
535e7b4b | 28 | #include <linux/kernel.h> |
dc4bb0e2 | 29 | #include <linux/idr.h> |
cb4d2b3f MKL |
30 | #include <linux/cred.h> |
31 | #include <linux/timekeeping.h> | |
32 | #include <linux/ctype.h> | |
9ef09e35 | 33 | #include <linux/nospec.h> |
99c55f7d | 34 | |
14dc6f04 MKL |
35 | #define IS_FD_ARRAY(map) ((map)->map_type == BPF_MAP_TYPE_PROG_ARRAY || \ |
36 | (map)->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY || \ | |
37 | (map)->map_type == BPF_MAP_TYPE_CGROUP_ARRAY || \ | |
38 | (map)->map_type == BPF_MAP_TYPE_ARRAY_OF_MAPS) | |
39 | #define IS_FD_HASH(map) ((map)->map_type == BPF_MAP_TYPE_HASH_OF_MAPS) | |
40 | #define IS_FD_MAP(map) (IS_FD_ARRAY(map) || IS_FD_HASH(map)) | |
41 | ||
6e71b04a CF |
42 | #define BPF_OBJ_FLAG_MASK (BPF_F_RDONLY | BPF_F_WRONLY) |
43 | ||
b121d1e7 | 44 | DEFINE_PER_CPU(int, bpf_prog_active); |
dc4bb0e2 MKL |
45 | static DEFINE_IDR(prog_idr); |
46 | static DEFINE_SPINLOCK(prog_idr_lock); | |
f3f1c054 MKL |
47 | static DEFINE_IDR(map_idr); |
48 | static DEFINE_SPINLOCK(map_idr_lock); | |
b121d1e7 | 49 | |
1be7f75d AS |
50 | int sysctl_unprivileged_bpf_disabled __read_mostly; |
51 | ||
40077e0c JB |
52 | static const struct bpf_map_ops * const bpf_map_types[] = { |
53 | #define BPF_PROG_TYPE(_id, _ops) | |
54 | #define BPF_MAP_TYPE(_id, _ops) \ | |
55 | [_id] = &_ops, | |
56 | #include <linux/bpf_types.h> | |
57 | #undef BPF_PROG_TYPE | |
58 | #undef BPF_MAP_TYPE | |
59 | }; | |
99c55f7d | 60 | |
752ba56f MS |
61 | /* |
62 | * If we're handed a bigger struct than we know of, ensure all the unknown bits | |
63 | * are 0 - i.e. new user-space does not rely on any kernel feature extensions | |
64 | * we don't know about yet. | |
65 | * | |
66 | * There is a ToCToU between this function call and the following | |
67 | * copy_from_user() call. However, this is not a concern since this function is | |
68 | * meant to be a future-proofing of bits. | |
69 | */ | |
dcab51f1 MKL |
70 | int bpf_check_uarg_tail_zero(void __user *uaddr, |
71 | size_t expected_size, | |
72 | size_t actual_size) | |
58291a74 MS |
73 | { |
74 | unsigned char __user *addr; | |
75 | unsigned char __user *end; | |
76 | unsigned char val; | |
77 | int err; | |
78 | ||
752ba56f MS |
79 | if (unlikely(actual_size > PAGE_SIZE)) /* silly large */ |
80 | return -E2BIG; | |
81 | ||
96d4f267 | 82 | if (unlikely(!access_ok(uaddr, actual_size))) |
752ba56f MS |
83 | return -EFAULT; |
84 | ||
58291a74 MS |
85 | if (actual_size <= expected_size) |
86 | return 0; | |
87 | ||
88 | addr = uaddr + expected_size; | |
89 | end = uaddr + actual_size; | |
90 | ||
91 | for (; addr < end; addr++) { | |
92 | err = get_user(val, addr); | |
93 | if (err) | |
94 | return err; | |
95 | if (val) | |
96 | return -E2BIG; | |
97 | } | |
98 | ||
99 | return 0; | |
100 | } | |
101 | ||
a3884572 JK |
102 | const struct bpf_map_ops bpf_map_offload_ops = { |
103 | .map_alloc = bpf_map_offload_map_alloc, | |
104 | .map_free = bpf_map_offload_map_free, | |
e8d2bec0 | 105 | .map_check_btf = map_check_no_btf, |
a3884572 JK |
106 | }; |
107 | ||
99c55f7d AS |
108 | static struct bpf_map *find_and_alloc_map(union bpf_attr *attr) |
109 | { | |
1110f3a9 | 110 | const struct bpf_map_ops *ops; |
9ef09e35 | 111 | u32 type = attr->map_type; |
99c55f7d | 112 | struct bpf_map *map; |
1110f3a9 | 113 | int err; |
99c55f7d | 114 | |
9ef09e35 | 115 | if (type >= ARRAY_SIZE(bpf_map_types)) |
1110f3a9 | 116 | return ERR_PTR(-EINVAL); |
9ef09e35 MR |
117 | type = array_index_nospec(type, ARRAY_SIZE(bpf_map_types)); |
118 | ops = bpf_map_types[type]; | |
1110f3a9 | 119 | if (!ops) |
40077e0c | 120 | return ERR_PTR(-EINVAL); |
99c55f7d | 121 | |
1110f3a9 JK |
122 | if (ops->map_alloc_check) { |
123 | err = ops->map_alloc_check(attr); | |
124 | if (err) | |
125 | return ERR_PTR(err); | |
126 | } | |
a3884572 JK |
127 | if (attr->map_ifindex) |
128 | ops = &bpf_map_offload_ops; | |
1110f3a9 | 129 | map = ops->map_alloc(attr); |
40077e0c JB |
130 | if (IS_ERR(map)) |
131 | return map; | |
1110f3a9 | 132 | map->ops = ops; |
9ef09e35 | 133 | map->map_type = type; |
40077e0c | 134 | return map; |
99c55f7d AS |
135 | } |
136 | ||
96eabe7a | 137 | void *bpf_map_area_alloc(size_t size, int numa_node) |
d407bd25 | 138 | { |
f01a7dbe MP |
139 | /* We really just want to fail instead of triggering OOM killer |
140 | * under memory pressure, therefore we set __GFP_NORETRY to kmalloc, | |
141 | * which is used for lower order allocation requests. | |
142 | * | |
143 | * It has been observed that higher order allocation requests done by | |
144 | * vmalloc with __GFP_NORETRY being set might fail due to not trying | |
145 | * to reclaim memory from the page cache, thus we set | |
146 | * __GFP_RETRY_MAYFAIL to avoid such situations. | |
d407bd25 | 147 | */ |
f01a7dbe MP |
148 | |
149 | const gfp_t flags = __GFP_NOWARN | __GFP_ZERO; | |
d407bd25 DB |
150 | void *area; |
151 | ||
152 | if (size <= (PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER)) { | |
f01a7dbe MP |
153 | area = kmalloc_node(size, GFP_USER | __GFP_NORETRY | flags, |
154 | numa_node); | |
d407bd25 DB |
155 | if (area != NULL) |
156 | return area; | |
157 | } | |
158 | ||
f01a7dbe MP |
159 | return __vmalloc_node_flags_caller(size, numa_node, |
160 | GFP_KERNEL | __GFP_RETRY_MAYFAIL | | |
161 | flags, __builtin_return_address(0)); | |
d407bd25 DB |
162 | } |
163 | ||
164 | void bpf_map_area_free(void *area) | |
165 | { | |
166 | kvfree(area); | |
167 | } | |
168 | ||
be70bcd5 DB |
169 | static u32 bpf_map_flags_retain_permanent(u32 flags) |
170 | { | |
171 | /* Some map creation flags are not tied to the map object but | |
172 | * rather to the map fd instead, so they have no meaning upon | |
173 | * map object inspection since multiple file descriptors with | |
174 | * different (access) properties can exist here. Thus, given | |
175 | * this has zero meaning for the map itself, lets clear these | |
176 | * from here. | |
177 | */ | |
178 | return flags & ~(BPF_F_RDONLY | BPF_F_WRONLY); | |
179 | } | |
180 | ||
bd475643 JK |
181 | void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr) |
182 | { | |
183 | map->map_type = attr->map_type; | |
184 | map->key_size = attr->key_size; | |
185 | map->value_size = attr->value_size; | |
186 | map->max_entries = attr->max_entries; | |
be70bcd5 | 187 | map->map_flags = bpf_map_flags_retain_permanent(attr->map_flags); |
bd475643 JK |
188 | map->numa_node = bpf_map_attr_numa_node(attr); |
189 | } | |
190 | ||
6c905981 AS |
191 | int bpf_map_precharge_memlock(u32 pages) |
192 | { | |
193 | struct user_struct *user = get_current_user(); | |
194 | unsigned long memlock_limit, cur; | |
195 | ||
196 | memlock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
197 | cur = atomic_long_read(&user->locked_vm); | |
198 | free_uid(user); | |
199 | if (cur + pages > memlock_limit) | |
200 | return -EPERM; | |
201 | return 0; | |
202 | } | |
203 | ||
0a4c58f5 | 204 | static int bpf_charge_memlock(struct user_struct *user, u32 pages) |
aaac3ba9 | 205 | { |
0a4c58f5 | 206 | unsigned long memlock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; |
aaac3ba9 | 207 | |
0a4c58f5 RG |
208 | if (atomic_long_add_return(pages, &user->locked_vm) > memlock_limit) { |
209 | atomic_long_sub(pages, &user->locked_vm); | |
210 | return -EPERM; | |
211 | } | |
212 | return 0; | |
213 | } | |
aaac3ba9 | 214 | |
0a4c58f5 RG |
215 | static void bpf_uncharge_memlock(struct user_struct *user, u32 pages) |
216 | { | |
217 | atomic_long_sub(pages, &user->locked_vm); | |
218 | } | |
aaac3ba9 | 219 | |
0a4c58f5 RG |
220 | static int bpf_map_init_memlock(struct bpf_map *map) |
221 | { | |
222 | struct user_struct *user = get_current_user(); | |
223 | int ret; | |
aaac3ba9 | 224 | |
0a4c58f5 RG |
225 | ret = bpf_charge_memlock(user, map->pages); |
226 | if (ret) { | |
aaac3ba9 | 227 | free_uid(user); |
0a4c58f5 | 228 | return ret; |
aaac3ba9 AS |
229 | } |
230 | map->user = user; | |
0a4c58f5 | 231 | return ret; |
aaac3ba9 AS |
232 | } |
233 | ||
0a4c58f5 | 234 | static void bpf_map_release_memlock(struct bpf_map *map) |
aaac3ba9 AS |
235 | { |
236 | struct user_struct *user = map->user; | |
0a4c58f5 | 237 | bpf_uncharge_memlock(user, map->pages); |
aaac3ba9 AS |
238 | free_uid(user); |
239 | } | |
240 | ||
0a4c58f5 RG |
241 | int bpf_map_charge_memlock(struct bpf_map *map, u32 pages) |
242 | { | |
243 | int ret; | |
244 | ||
245 | ret = bpf_charge_memlock(map->user, pages); | |
246 | if (ret) | |
247 | return ret; | |
248 | map->pages += pages; | |
249 | return ret; | |
250 | } | |
251 | ||
252 | void bpf_map_uncharge_memlock(struct bpf_map *map, u32 pages) | |
253 | { | |
254 | bpf_uncharge_memlock(map->user, pages); | |
255 | map->pages -= pages; | |
256 | } | |
257 | ||
f3f1c054 MKL |
258 | static int bpf_map_alloc_id(struct bpf_map *map) |
259 | { | |
260 | int id; | |
261 | ||
b76354cd | 262 | idr_preload(GFP_KERNEL); |
f3f1c054 MKL |
263 | spin_lock_bh(&map_idr_lock); |
264 | id = idr_alloc_cyclic(&map_idr, map, 1, INT_MAX, GFP_ATOMIC); | |
265 | if (id > 0) | |
266 | map->id = id; | |
267 | spin_unlock_bh(&map_idr_lock); | |
b76354cd | 268 | idr_preload_end(); |
f3f1c054 MKL |
269 | |
270 | if (WARN_ON_ONCE(!id)) | |
271 | return -ENOSPC; | |
272 | ||
273 | return id > 0 ? 0 : id; | |
274 | } | |
275 | ||
a3884572 | 276 | void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock) |
f3f1c054 | 277 | { |
930651a7 ED |
278 | unsigned long flags; |
279 | ||
a3884572 JK |
280 | /* Offloaded maps are removed from the IDR store when their device |
281 | * disappears - even if someone holds an fd to them they are unusable, | |
282 | * the memory is gone, all ops will fail; they are simply waiting for | |
283 | * refcnt to drop to be freed. | |
284 | */ | |
285 | if (!map->id) | |
286 | return; | |
287 | ||
bd5f5f4e | 288 | if (do_idr_lock) |
930651a7 | 289 | spin_lock_irqsave(&map_idr_lock, flags); |
bd5f5f4e MKL |
290 | else |
291 | __acquire(&map_idr_lock); | |
292 | ||
f3f1c054 | 293 | idr_remove(&map_idr, map->id); |
a3884572 | 294 | map->id = 0; |
bd5f5f4e MKL |
295 | |
296 | if (do_idr_lock) | |
930651a7 | 297 | spin_unlock_irqrestore(&map_idr_lock, flags); |
bd5f5f4e MKL |
298 | else |
299 | __release(&map_idr_lock); | |
f3f1c054 MKL |
300 | } |
301 | ||
99c55f7d AS |
302 | /* called from workqueue */ |
303 | static void bpf_map_free_deferred(struct work_struct *work) | |
304 | { | |
305 | struct bpf_map *map = container_of(work, struct bpf_map, work); | |
306 | ||
0a4c58f5 | 307 | bpf_map_release_memlock(map); |
afdb09c7 | 308 | security_bpf_map_free(map); |
99c55f7d AS |
309 | /* implementation dependent freeing */ |
310 | map->ops->map_free(map); | |
311 | } | |
312 | ||
c9da161c DB |
313 | static void bpf_map_put_uref(struct bpf_map *map) |
314 | { | |
315 | if (atomic_dec_and_test(&map->usercnt)) { | |
ba6b8de4 JF |
316 | if (map->ops->map_release_uref) |
317 | map->ops->map_release_uref(map); | |
c9da161c DB |
318 | } |
319 | } | |
320 | ||
99c55f7d AS |
321 | /* decrement map refcnt and schedule it for freeing via workqueue |
322 | * (unrelying map implementation ops->map_free() might sleep) | |
323 | */ | |
bd5f5f4e | 324 | static void __bpf_map_put(struct bpf_map *map, bool do_idr_lock) |
99c55f7d AS |
325 | { |
326 | if (atomic_dec_and_test(&map->refcnt)) { | |
34ad5580 | 327 | /* bpf_map_free_id() must be called first */ |
bd5f5f4e | 328 | bpf_map_free_id(map, do_idr_lock); |
78958fca | 329 | btf_put(map->btf); |
99c55f7d AS |
330 | INIT_WORK(&map->work, bpf_map_free_deferred); |
331 | schedule_work(&map->work); | |
332 | } | |
333 | } | |
334 | ||
bd5f5f4e MKL |
335 | void bpf_map_put(struct bpf_map *map) |
336 | { | |
337 | __bpf_map_put(map, true); | |
338 | } | |
630a4d38 | 339 | EXPORT_SYMBOL_GPL(bpf_map_put); |
bd5f5f4e | 340 | |
c9da161c | 341 | void bpf_map_put_with_uref(struct bpf_map *map) |
99c55f7d | 342 | { |
c9da161c | 343 | bpf_map_put_uref(map); |
99c55f7d | 344 | bpf_map_put(map); |
c9da161c DB |
345 | } |
346 | ||
347 | static int bpf_map_release(struct inode *inode, struct file *filp) | |
348 | { | |
61d1b6a4 DB |
349 | struct bpf_map *map = filp->private_data; |
350 | ||
351 | if (map->ops->map_release) | |
352 | map->ops->map_release(map, filp); | |
353 | ||
354 | bpf_map_put_with_uref(map); | |
99c55f7d AS |
355 | return 0; |
356 | } | |
357 | ||
87df15de DB |
358 | static fmode_t map_get_sys_perms(struct bpf_map *map, struct fd f) |
359 | { | |
360 | fmode_t mode = f.file->f_mode; | |
361 | ||
362 | /* Our file permissions may have been overridden by global | |
363 | * map permissions facing syscall side. | |
364 | */ | |
365 | if (READ_ONCE(map->frozen)) | |
366 | mode &= ~FMODE_CAN_WRITE; | |
367 | return mode; | |
368 | } | |
369 | ||
f99bf205 DB |
370 | #ifdef CONFIG_PROC_FS |
371 | static void bpf_map_show_fdinfo(struct seq_file *m, struct file *filp) | |
372 | { | |
373 | const struct bpf_map *map = filp->private_data; | |
21116b70 DB |
374 | const struct bpf_array *array; |
375 | u32 owner_prog_type = 0; | |
9780c0ab | 376 | u32 owner_jited = 0; |
21116b70 DB |
377 | |
378 | if (map->map_type == BPF_MAP_TYPE_PROG_ARRAY) { | |
379 | array = container_of(map, struct bpf_array, map); | |
380 | owner_prog_type = array->owner_prog_type; | |
9780c0ab | 381 | owner_jited = array->owner_jited; |
21116b70 | 382 | } |
f99bf205 DB |
383 | |
384 | seq_printf(m, | |
385 | "map_type:\t%u\n" | |
386 | "key_size:\t%u\n" | |
387 | "value_size:\t%u\n" | |
322cea2f | 388 | "max_entries:\t%u\n" |
21116b70 | 389 | "map_flags:\t%#x\n" |
4316b409 | 390 | "memlock:\t%llu\n" |
87df15de DB |
391 | "map_id:\t%u\n" |
392 | "frozen:\t%u\n", | |
f99bf205 DB |
393 | map->map_type, |
394 | map->key_size, | |
395 | map->value_size, | |
322cea2f | 396 | map->max_entries, |
21116b70 | 397 | map->map_flags, |
4316b409 | 398 | map->pages * 1ULL << PAGE_SHIFT, |
87df15de DB |
399 | map->id, |
400 | READ_ONCE(map->frozen)); | |
21116b70 | 401 | |
9780c0ab | 402 | if (owner_prog_type) { |
21116b70 DB |
403 | seq_printf(m, "owner_prog_type:\t%u\n", |
404 | owner_prog_type); | |
9780c0ab DB |
405 | seq_printf(m, "owner_jited:\t%u\n", |
406 | owner_jited); | |
407 | } | |
f99bf205 DB |
408 | } |
409 | #endif | |
410 | ||
6e71b04a CF |
411 | static ssize_t bpf_dummy_read(struct file *filp, char __user *buf, size_t siz, |
412 | loff_t *ppos) | |
413 | { | |
414 | /* We need this handler such that alloc_file() enables | |
415 | * f_mode with FMODE_CAN_READ. | |
416 | */ | |
417 | return -EINVAL; | |
418 | } | |
419 | ||
420 | static ssize_t bpf_dummy_write(struct file *filp, const char __user *buf, | |
421 | size_t siz, loff_t *ppos) | |
422 | { | |
423 | /* We need this handler such that alloc_file() enables | |
424 | * f_mode with FMODE_CAN_WRITE. | |
425 | */ | |
426 | return -EINVAL; | |
427 | } | |
428 | ||
f66e448c | 429 | const struct file_operations bpf_map_fops = { |
f99bf205 DB |
430 | #ifdef CONFIG_PROC_FS |
431 | .show_fdinfo = bpf_map_show_fdinfo, | |
432 | #endif | |
433 | .release = bpf_map_release, | |
6e71b04a CF |
434 | .read = bpf_dummy_read, |
435 | .write = bpf_dummy_write, | |
99c55f7d AS |
436 | }; |
437 | ||
6e71b04a | 438 | int bpf_map_new_fd(struct bpf_map *map, int flags) |
aa79781b | 439 | { |
afdb09c7 CF |
440 | int ret; |
441 | ||
442 | ret = security_bpf_map(map, OPEN_FMODE(flags)); | |
443 | if (ret < 0) | |
444 | return ret; | |
445 | ||
aa79781b | 446 | return anon_inode_getfd("bpf-map", &bpf_map_fops, map, |
6e71b04a CF |
447 | flags | O_CLOEXEC); |
448 | } | |
449 | ||
450 | int bpf_get_file_flag(int flags) | |
451 | { | |
452 | if ((flags & BPF_F_RDONLY) && (flags & BPF_F_WRONLY)) | |
453 | return -EINVAL; | |
454 | if (flags & BPF_F_RDONLY) | |
455 | return O_RDONLY; | |
456 | if (flags & BPF_F_WRONLY) | |
457 | return O_WRONLY; | |
458 | return O_RDWR; | |
aa79781b DB |
459 | } |
460 | ||
99c55f7d AS |
461 | /* helper macro to check that unused fields 'union bpf_attr' are zero */ |
462 | #define CHECK_ATTR(CMD) \ | |
463 | memchr_inv((void *) &attr->CMD##_LAST_FIELD + \ | |
464 | sizeof(attr->CMD##_LAST_FIELD), 0, \ | |
465 | sizeof(*attr) - \ | |
466 | offsetof(union bpf_attr, CMD##_LAST_FIELD) - \ | |
467 | sizeof(attr->CMD##_LAST_FIELD)) != NULL | |
468 | ||
cb4d2b3f MKL |
469 | /* dst and src must have at least BPF_OBJ_NAME_LEN number of bytes. |
470 | * Return 0 on success and < 0 on error. | |
471 | */ | |
472 | static int bpf_obj_name_cpy(char *dst, const char *src) | |
473 | { | |
474 | const char *end = src + BPF_OBJ_NAME_LEN; | |
475 | ||
473d9734 | 476 | memset(dst, 0, BPF_OBJ_NAME_LEN); |
3e0ddc4f | 477 | /* Copy all isalnum(), '_' and '.' chars. */ |
cb4d2b3f | 478 | while (src < end && *src) { |
3e0ddc4f DB |
479 | if (!isalnum(*src) && |
480 | *src != '_' && *src != '.') | |
cb4d2b3f MKL |
481 | return -EINVAL; |
482 | *dst++ = *src++; | |
483 | } | |
484 | ||
485 | /* No '\0' found in BPF_OBJ_NAME_LEN number of bytes */ | |
486 | if (src == end) | |
487 | return -EINVAL; | |
488 | ||
cb4d2b3f MKL |
489 | return 0; |
490 | } | |
491 | ||
e8d2bec0 | 492 | int map_check_no_btf(const struct bpf_map *map, |
1b2b234b | 493 | const struct btf *btf, |
e8d2bec0 DB |
494 | const struct btf_type *key_type, |
495 | const struct btf_type *value_type) | |
496 | { | |
497 | return -ENOTSUPP; | |
498 | } | |
499 | ||
d83525ca | 500 | static int map_check_btf(struct bpf_map *map, const struct btf *btf, |
e8d2bec0 DB |
501 | u32 btf_key_id, u32 btf_value_id) |
502 | { | |
503 | const struct btf_type *key_type, *value_type; | |
504 | u32 key_size, value_size; | |
505 | int ret = 0; | |
506 | ||
2824ecb7 DB |
507 | /* Some maps allow key to be unspecified. */ |
508 | if (btf_key_id) { | |
509 | key_type = btf_type_id_size(btf, &btf_key_id, &key_size); | |
510 | if (!key_type || key_size != map->key_size) | |
511 | return -EINVAL; | |
512 | } else { | |
513 | key_type = btf_type_by_id(btf, 0); | |
514 | if (!map->ops->map_check_btf) | |
515 | return -EINVAL; | |
516 | } | |
e8d2bec0 DB |
517 | |
518 | value_type = btf_type_id_size(btf, &btf_value_id, &value_size); | |
519 | if (!value_type || value_size != map->value_size) | |
520 | return -EINVAL; | |
521 | ||
d83525ca AS |
522 | map->spin_lock_off = btf_find_spin_lock(btf, value_type); |
523 | ||
524 | if (map_value_has_spin_lock(map)) { | |
591fe988 DB |
525 | if (map->map_flags & BPF_F_RDONLY_PROG) |
526 | return -EACCES; | |
d83525ca | 527 | if (map->map_type != BPF_MAP_TYPE_HASH && |
e16d2f1a | 528 | map->map_type != BPF_MAP_TYPE_ARRAY && |
6ac99e8f MKL |
529 | map->map_type != BPF_MAP_TYPE_CGROUP_STORAGE && |
530 | map->map_type != BPF_MAP_TYPE_SK_STORAGE) | |
d83525ca AS |
531 | return -ENOTSUPP; |
532 | if (map->spin_lock_off + sizeof(struct bpf_spin_lock) > | |
533 | map->value_size) { | |
534 | WARN_ONCE(1, | |
535 | "verifier bug spin_lock_off %d value_size %d\n", | |
536 | map->spin_lock_off, map->value_size); | |
537 | return -EFAULT; | |
538 | } | |
539 | } | |
540 | ||
e8d2bec0 | 541 | if (map->ops->map_check_btf) |
1b2b234b | 542 | ret = map->ops->map_check_btf(map, btf, key_type, value_type); |
e8d2bec0 DB |
543 | |
544 | return ret; | |
545 | } | |
546 | ||
9b2cf328 | 547 | #define BPF_MAP_CREATE_LAST_FIELD btf_value_type_id |
99c55f7d AS |
548 | /* called via syscall */ |
549 | static int map_create(union bpf_attr *attr) | |
550 | { | |
96eabe7a | 551 | int numa_node = bpf_map_attr_numa_node(attr); |
99c55f7d | 552 | struct bpf_map *map; |
6e71b04a | 553 | int f_flags; |
99c55f7d AS |
554 | int err; |
555 | ||
556 | err = CHECK_ATTR(BPF_MAP_CREATE); | |
557 | if (err) | |
558 | return -EINVAL; | |
559 | ||
6e71b04a CF |
560 | f_flags = bpf_get_file_flag(attr->map_flags); |
561 | if (f_flags < 0) | |
562 | return f_flags; | |
563 | ||
96eabe7a | 564 | if (numa_node != NUMA_NO_NODE && |
96e5ae4e ED |
565 | ((unsigned int)numa_node >= nr_node_ids || |
566 | !node_online(numa_node))) | |
96eabe7a MKL |
567 | return -EINVAL; |
568 | ||
99c55f7d AS |
569 | /* find map type and init map: hashtable vs rbtree vs bloom vs ... */ |
570 | map = find_and_alloc_map(attr); | |
571 | if (IS_ERR(map)) | |
572 | return PTR_ERR(map); | |
573 | ||
ad5b177b MKL |
574 | err = bpf_obj_name_cpy(map->name, attr->map_name); |
575 | if (err) | |
576 | goto free_map_nouncharge; | |
577 | ||
99c55f7d | 578 | atomic_set(&map->refcnt, 1); |
c9da161c | 579 | atomic_set(&map->usercnt, 1); |
99c55f7d | 580 | |
e8d2bec0 | 581 | if (attr->btf_key_type_id || attr->btf_value_type_id) { |
a26ca7c9 MKL |
582 | struct btf *btf; |
583 | ||
2824ecb7 | 584 | if (!attr->btf_value_type_id) { |
a26ca7c9 MKL |
585 | err = -EINVAL; |
586 | goto free_map_nouncharge; | |
587 | } | |
588 | ||
589 | btf = btf_get_by_fd(attr->btf_fd); | |
590 | if (IS_ERR(btf)) { | |
591 | err = PTR_ERR(btf); | |
592 | goto free_map_nouncharge; | |
593 | } | |
594 | ||
e8d2bec0 DB |
595 | err = map_check_btf(map, btf, attr->btf_key_type_id, |
596 | attr->btf_value_type_id); | |
a26ca7c9 MKL |
597 | if (err) { |
598 | btf_put(btf); | |
599 | goto free_map_nouncharge; | |
600 | } | |
601 | ||
602 | map->btf = btf; | |
9b2cf328 MKL |
603 | map->btf_key_type_id = attr->btf_key_type_id; |
604 | map->btf_value_type_id = attr->btf_value_type_id; | |
d83525ca AS |
605 | } else { |
606 | map->spin_lock_off = -EINVAL; | |
a26ca7c9 MKL |
607 | } |
608 | ||
afdb09c7 | 609 | err = security_bpf_map_alloc(map); |
aaac3ba9 | 610 | if (err) |
20b2b24f | 611 | goto free_map_nouncharge; |
aaac3ba9 | 612 | |
0a4c58f5 | 613 | err = bpf_map_init_memlock(map); |
afdb09c7 CF |
614 | if (err) |
615 | goto free_map_sec; | |
616 | ||
f3f1c054 MKL |
617 | err = bpf_map_alloc_id(map); |
618 | if (err) | |
619 | goto free_map; | |
620 | ||
6e71b04a | 621 | err = bpf_map_new_fd(map, f_flags); |
bd5f5f4e MKL |
622 | if (err < 0) { |
623 | /* failed to allocate fd. | |
352d20d6 | 624 | * bpf_map_put_with_uref() is needed because the above |
bd5f5f4e MKL |
625 | * bpf_map_alloc_id() has published the map |
626 | * to the userspace and the userspace may | |
627 | * have refcnt-ed it through BPF_MAP_GET_FD_BY_ID. | |
628 | */ | |
352d20d6 | 629 | bpf_map_put_with_uref(map); |
bd5f5f4e MKL |
630 | return err; |
631 | } | |
99c55f7d AS |
632 | |
633 | return err; | |
634 | ||
635 | free_map: | |
0a4c58f5 | 636 | bpf_map_release_memlock(map); |
afdb09c7 CF |
637 | free_map_sec: |
638 | security_bpf_map_free(map); | |
20b2b24f | 639 | free_map_nouncharge: |
a26ca7c9 | 640 | btf_put(map->btf); |
99c55f7d AS |
641 | map->ops->map_free(map); |
642 | return err; | |
643 | } | |
644 | ||
db20fd2b AS |
645 | /* if error is returned, fd is released. |
646 | * On success caller should complete fd access with matching fdput() | |
647 | */ | |
c2101297 | 648 | struct bpf_map *__bpf_map_get(struct fd f) |
db20fd2b | 649 | { |
db20fd2b AS |
650 | if (!f.file) |
651 | return ERR_PTR(-EBADF); | |
db20fd2b AS |
652 | if (f.file->f_op != &bpf_map_fops) { |
653 | fdput(f); | |
654 | return ERR_PTR(-EINVAL); | |
655 | } | |
656 | ||
c2101297 DB |
657 | return f.file->private_data; |
658 | } | |
659 | ||
92117d84 AS |
660 | /* prog's and map's refcnt limit */ |
661 | #define BPF_MAX_REFCNT 32768 | |
662 | ||
663 | struct bpf_map *bpf_map_inc(struct bpf_map *map, bool uref) | |
c9da161c | 664 | { |
92117d84 AS |
665 | if (atomic_inc_return(&map->refcnt) > BPF_MAX_REFCNT) { |
666 | atomic_dec(&map->refcnt); | |
667 | return ERR_PTR(-EBUSY); | |
668 | } | |
c9da161c DB |
669 | if (uref) |
670 | atomic_inc(&map->usercnt); | |
92117d84 | 671 | return map; |
c9da161c | 672 | } |
630a4d38 | 673 | EXPORT_SYMBOL_GPL(bpf_map_inc); |
c9da161c DB |
674 | |
675 | struct bpf_map *bpf_map_get_with_uref(u32 ufd) | |
c2101297 DB |
676 | { |
677 | struct fd f = fdget(ufd); | |
678 | struct bpf_map *map; | |
679 | ||
680 | map = __bpf_map_get(f); | |
681 | if (IS_ERR(map)) | |
682 | return map; | |
683 | ||
92117d84 | 684 | map = bpf_map_inc(map, true); |
c2101297 | 685 | fdput(f); |
db20fd2b AS |
686 | |
687 | return map; | |
688 | } | |
689 | ||
bd5f5f4e MKL |
690 | /* map_idr_lock should have been held */ |
691 | static struct bpf_map *bpf_map_inc_not_zero(struct bpf_map *map, | |
692 | bool uref) | |
693 | { | |
694 | int refold; | |
695 | ||
bfc18e38 | 696 | refold = atomic_fetch_add_unless(&map->refcnt, 1, 0); |
bd5f5f4e MKL |
697 | |
698 | if (refold >= BPF_MAX_REFCNT) { | |
699 | __bpf_map_put(map, false); | |
700 | return ERR_PTR(-EBUSY); | |
701 | } | |
702 | ||
703 | if (!refold) | |
704 | return ERR_PTR(-ENOENT); | |
705 | ||
706 | if (uref) | |
707 | atomic_inc(&map->usercnt); | |
708 | ||
709 | return map; | |
710 | } | |
711 | ||
b8cdc051 AS |
712 | int __weak bpf_stackmap_copy(struct bpf_map *map, void *key, void *value) |
713 | { | |
714 | return -ENOTSUPP; | |
715 | } | |
716 | ||
c9d29f46 MV |
717 | static void *__bpf_copy_key(void __user *ukey, u64 key_size) |
718 | { | |
719 | if (key_size) | |
720 | return memdup_user(ukey, key_size); | |
721 | ||
722 | if (ukey) | |
723 | return ERR_PTR(-EINVAL); | |
724 | ||
725 | return NULL; | |
726 | } | |
727 | ||
db20fd2b | 728 | /* last field in 'union bpf_attr' used by this command */ |
96049f3a | 729 | #define BPF_MAP_LOOKUP_ELEM_LAST_FIELD flags |
db20fd2b AS |
730 | |
731 | static int map_lookup_elem(union bpf_attr *attr) | |
732 | { | |
535e7b4b MS |
733 | void __user *ukey = u64_to_user_ptr(attr->key); |
734 | void __user *uvalue = u64_to_user_ptr(attr->value); | |
db20fd2b | 735 | int ufd = attr->map_fd; |
db20fd2b | 736 | struct bpf_map *map; |
8ebe667c | 737 | void *key, *value, *ptr; |
15a07b33 | 738 | u32 value_size; |
592867bf | 739 | struct fd f; |
db20fd2b AS |
740 | int err; |
741 | ||
742 | if (CHECK_ATTR(BPF_MAP_LOOKUP_ELEM)) | |
743 | return -EINVAL; | |
744 | ||
96049f3a AS |
745 | if (attr->flags & ~BPF_F_LOCK) |
746 | return -EINVAL; | |
747 | ||
592867bf | 748 | f = fdget(ufd); |
c2101297 | 749 | map = __bpf_map_get(f); |
db20fd2b AS |
750 | if (IS_ERR(map)) |
751 | return PTR_ERR(map); | |
87df15de | 752 | if (!(map_get_sys_perms(map, f) & FMODE_CAN_READ)) { |
6e71b04a CF |
753 | err = -EPERM; |
754 | goto err_put; | |
755 | } | |
756 | ||
96049f3a AS |
757 | if ((attr->flags & BPF_F_LOCK) && |
758 | !map_value_has_spin_lock(map)) { | |
759 | err = -EINVAL; | |
760 | goto err_put; | |
761 | } | |
762 | ||
c9d29f46 | 763 | key = __bpf_copy_key(ukey, map->key_size); |
e4448ed8 AV |
764 | if (IS_ERR(key)) { |
765 | err = PTR_ERR(key); | |
db20fd2b | 766 | goto err_put; |
e4448ed8 | 767 | } |
db20fd2b | 768 | |
15a07b33 | 769 | if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH || |
8f844938 | 770 | map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH || |
b741f163 RG |
771 | map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY || |
772 | map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE) | |
15a07b33 | 773 | value_size = round_up(map->value_size, 8) * num_possible_cpus(); |
14dc6f04 MKL |
774 | else if (IS_FD_MAP(map)) |
775 | value_size = sizeof(u32); | |
15a07b33 AS |
776 | else |
777 | value_size = map->value_size; | |
778 | ||
8ebe667c | 779 | err = -ENOMEM; |
15a07b33 | 780 | value = kmalloc(value_size, GFP_USER | __GFP_NOWARN); |
db20fd2b | 781 | if (!value) |
8ebe667c AS |
782 | goto free_key; |
783 | ||
a3884572 JK |
784 | if (bpf_map_is_dev_bound(map)) { |
785 | err = bpf_map_offload_lookup_elem(map, key, value); | |
7c4cd051 MKL |
786 | goto done; |
787 | } | |
788 | ||
789 | preempt_disable(); | |
790 | this_cpu_inc(bpf_prog_active); | |
791 | if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH || | |
792 | map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH) { | |
15a07b33 AS |
793 | err = bpf_percpu_hash_copy(map, key, value); |
794 | } else if (map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY) { | |
795 | err = bpf_percpu_array_copy(map, key, value); | |
b741f163 RG |
796 | } else if (map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE) { |
797 | err = bpf_percpu_cgroup_storage_copy(map, key, value); | |
557c0c6e AS |
798 | } else if (map->map_type == BPF_MAP_TYPE_STACK_TRACE) { |
799 | err = bpf_stackmap_copy(map, key, value); | |
14dc6f04 MKL |
800 | } else if (IS_FD_ARRAY(map)) { |
801 | err = bpf_fd_array_map_lookup_elem(map, key, value); | |
802 | } else if (IS_FD_HASH(map)) { | |
803 | err = bpf_fd_htab_map_lookup_elem(map, key, value); | |
5dc4c4b7 MKL |
804 | } else if (map->map_type == BPF_MAP_TYPE_REUSEPORT_SOCKARRAY) { |
805 | err = bpf_fd_reuseport_array_lookup_elem(map, key, value); | |
f1a2e44a MV |
806 | } else if (map->map_type == BPF_MAP_TYPE_QUEUE || |
807 | map->map_type == BPF_MAP_TYPE_STACK) { | |
808 | err = map->ops->map_peek_elem(map, value); | |
15a07b33 AS |
809 | } else { |
810 | rcu_read_lock(); | |
c6110222 DB |
811 | if (map->ops->map_lookup_elem_sys_only) |
812 | ptr = map->ops->map_lookup_elem_sys_only(map, key); | |
813 | else | |
814 | ptr = map->ops->map_lookup_elem(map, key); | |
509db283 PB |
815 | if (IS_ERR(ptr)) { |
816 | err = PTR_ERR(ptr); | |
817 | } else if (!ptr) { | |
818 | err = -ENOENT; | |
819 | } else { | |
820 | err = 0; | |
96049f3a AS |
821 | if (attr->flags & BPF_F_LOCK) |
822 | /* lock 'ptr' and copy everything but lock */ | |
823 | copy_map_value_locked(map, value, ptr, true); | |
824 | else | |
825 | copy_map_value(map, value, ptr); | |
826 | /* mask lock, since value wasn't zero inited */ | |
827 | check_and_init_map_lock(map, value); | |
509db283 | 828 | } |
15a07b33 | 829 | rcu_read_unlock(); |
15a07b33 | 830 | } |
7c4cd051 MKL |
831 | this_cpu_dec(bpf_prog_active); |
832 | preempt_enable(); | |
8ebe667c | 833 | |
7c4cd051 | 834 | done: |
15a07b33 | 835 | if (err) |
8ebe667c | 836 | goto free_value; |
db20fd2b AS |
837 | |
838 | err = -EFAULT; | |
15a07b33 | 839 | if (copy_to_user(uvalue, value, value_size) != 0) |
8ebe667c | 840 | goto free_value; |
db20fd2b AS |
841 | |
842 | err = 0; | |
843 | ||
8ebe667c AS |
844 | free_value: |
845 | kfree(value); | |
db20fd2b AS |
846 | free_key: |
847 | kfree(key); | |
848 | err_put: | |
849 | fdput(f); | |
850 | return err; | |
851 | } | |
852 | ||
1ae80cf3 DC |
853 | static void maybe_wait_bpf_programs(struct bpf_map *map) |
854 | { | |
855 | /* Wait for any running BPF programs to complete so that | |
856 | * userspace, when we return to it, knows that all programs | |
857 | * that could be running use the new map value. | |
858 | */ | |
859 | if (map->map_type == BPF_MAP_TYPE_HASH_OF_MAPS || | |
860 | map->map_type == BPF_MAP_TYPE_ARRAY_OF_MAPS) | |
861 | synchronize_rcu(); | |
862 | } | |
863 | ||
3274f520 | 864 | #define BPF_MAP_UPDATE_ELEM_LAST_FIELD flags |
db20fd2b AS |
865 | |
866 | static int map_update_elem(union bpf_attr *attr) | |
867 | { | |
535e7b4b MS |
868 | void __user *ukey = u64_to_user_ptr(attr->key); |
869 | void __user *uvalue = u64_to_user_ptr(attr->value); | |
db20fd2b | 870 | int ufd = attr->map_fd; |
db20fd2b AS |
871 | struct bpf_map *map; |
872 | void *key, *value; | |
15a07b33 | 873 | u32 value_size; |
592867bf | 874 | struct fd f; |
db20fd2b AS |
875 | int err; |
876 | ||
877 | if (CHECK_ATTR(BPF_MAP_UPDATE_ELEM)) | |
878 | return -EINVAL; | |
879 | ||
592867bf | 880 | f = fdget(ufd); |
c2101297 | 881 | map = __bpf_map_get(f); |
db20fd2b AS |
882 | if (IS_ERR(map)) |
883 | return PTR_ERR(map); | |
87df15de | 884 | if (!(map_get_sys_perms(map, f) & FMODE_CAN_WRITE)) { |
6e71b04a CF |
885 | err = -EPERM; |
886 | goto err_put; | |
887 | } | |
888 | ||
96049f3a AS |
889 | if ((attr->flags & BPF_F_LOCK) && |
890 | !map_value_has_spin_lock(map)) { | |
891 | err = -EINVAL; | |
892 | goto err_put; | |
893 | } | |
894 | ||
c9d29f46 | 895 | key = __bpf_copy_key(ukey, map->key_size); |
e4448ed8 AV |
896 | if (IS_ERR(key)) { |
897 | err = PTR_ERR(key); | |
db20fd2b | 898 | goto err_put; |
e4448ed8 | 899 | } |
db20fd2b | 900 | |
15a07b33 | 901 | if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH || |
8f844938 | 902 | map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH || |
b741f163 RG |
903 | map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY || |
904 | map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE) | |
15a07b33 AS |
905 | value_size = round_up(map->value_size, 8) * num_possible_cpus(); |
906 | else | |
907 | value_size = map->value_size; | |
908 | ||
db20fd2b | 909 | err = -ENOMEM; |
15a07b33 | 910 | value = kmalloc(value_size, GFP_USER | __GFP_NOWARN); |
db20fd2b AS |
911 | if (!value) |
912 | goto free_key; | |
913 | ||
914 | err = -EFAULT; | |
15a07b33 | 915 | if (copy_from_user(value, uvalue, value_size) != 0) |
db20fd2b AS |
916 | goto free_value; |
917 | ||
6710e112 | 918 | /* Need to create a kthread, thus must support schedule */ |
a3884572 JK |
919 | if (bpf_map_is_dev_bound(map)) { |
920 | err = bpf_map_offload_update_elem(map, key, value, attr->flags); | |
921 | goto out; | |
99ba2b5a JF |
922 | } else if (map->map_type == BPF_MAP_TYPE_CPUMAP || |
923 | map->map_type == BPF_MAP_TYPE_SOCKHASH || | |
924 | map->map_type == BPF_MAP_TYPE_SOCKMAP) { | |
6710e112 JDB |
925 | err = map->ops->map_update_elem(map, key, value, attr->flags); |
926 | goto out; | |
927 | } | |
928 | ||
b121d1e7 AS |
929 | /* must increment bpf_prog_active to avoid kprobe+bpf triggering from |
930 | * inside bpf map update or delete otherwise deadlocks are possible | |
931 | */ | |
932 | preempt_disable(); | |
933 | __this_cpu_inc(bpf_prog_active); | |
8f844938 MKL |
934 | if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH || |
935 | map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH) { | |
15a07b33 AS |
936 | err = bpf_percpu_hash_update(map, key, value, attr->flags); |
937 | } else if (map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY) { | |
938 | err = bpf_percpu_array_update(map, key, value, attr->flags); | |
b741f163 RG |
939 | } else if (map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE) { |
940 | err = bpf_percpu_cgroup_storage_update(map, key, value, | |
941 | attr->flags); | |
9c147b56 | 942 | } else if (IS_FD_ARRAY(map)) { |
d056a788 DB |
943 | rcu_read_lock(); |
944 | err = bpf_fd_array_map_update_elem(map, f.file, key, value, | |
945 | attr->flags); | |
946 | rcu_read_unlock(); | |
bcc6b1b7 MKL |
947 | } else if (map->map_type == BPF_MAP_TYPE_HASH_OF_MAPS) { |
948 | rcu_read_lock(); | |
949 | err = bpf_fd_htab_map_update_elem(map, f.file, key, value, | |
950 | attr->flags); | |
951 | rcu_read_unlock(); | |
5dc4c4b7 MKL |
952 | } else if (map->map_type == BPF_MAP_TYPE_REUSEPORT_SOCKARRAY) { |
953 | /* rcu_read_lock() is not needed */ | |
954 | err = bpf_fd_reuseport_array_update_elem(map, key, value, | |
955 | attr->flags); | |
f1a2e44a MV |
956 | } else if (map->map_type == BPF_MAP_TYPE_QUEUE || |
957 | map->map_type == BPF_MAP_TYPE_STACK) { | |
958 | err = map->ops->map_push_elem(map, value, attr->flags); | |
15a07b33 AS |
959 | } else { |
960 | rcu_read_lock(); | |
961 | err = map->ops->map_update_elem(map, key, value, attr->flags); | |
962 | rcu_read_unlock(); | |
963 | } | |
b121d1e7 AS |
964 | __this_cpu_dec(bpf_prog_active); |
965 | preempt_enable(); | |
1ae80cf3 | 966 | maybe_wait_bpf_programs(map); |
6710e112 | 967 | out: |
db20fd2b AS |
968 | free_value: |
969 | kfree(value); | |
970 | free_key: | |
971 | kfree(key); | |
972 | err_put: | |
973 | fdput(f); | |
974 | return err; | |
975 | } | |
976 | ||
977 | #define BPF_MAP_DELETE_ELEM_LAST_FIELD key | |
978 | ||
979 | static int map_delete_elem(union bpf_attr *attr) | |
980 | { | |
535e7b4b | 981 | void __user *ukey = u64_to_user_ptr(attr->key); |
db20fd2b | 982 | int ufd = attr->map_fd; |
db20fd2b | 983 | struct bpf_map *map; |
592867bf | 984 | struct fd f; |
db20fd2b AS |
985 | void *key; |
986 | int err; | |
987 | ||
988 | if (CHECK_ATTR(BPF_MAP_DELETE_ELEM)) | |
989 | return -EINVAL; | |
990 | ||
592867bf | 991 | f = fdget(ufd); |
c2101297 | 992 | map = __bpf_map_get(f); |
db20fd2b AS |
993 | if (IS_ERR(map)) |
994 | return PTR_ERR(map); | |
87df15de | 995 | if (!(map_get_sys_perms(map, f) & FMODE_CAN_WRITE)) { |
6e71b04a CF |
996 | err = -EPERM; |
997 | goto err_put; | |
998 | } | |
999 | ||
c9d29f46 | 1000 | key = __bpf_copy_key(ukey, map->key_size); |
e4448ed8 AV |
1001 | if (IS_ERR(key)) { |
1002 | err = PTR_ERR(key); | |
db20fd2b | 1003 | goto err_put; |
e4448ed8 | 1004 | } |
db20fd2b | 1005 | |
a3884572 JK |
1006 | if (bpf_map_is_dev_bound(map)) { |
1007 | err = bpf_map_offload_delete_elem(map, key); | |
1008 | goto out; | |
1009 | } | |
1010 | ||
b121d1e7 AS |
1011 | preempt_disable(); |
1012 | __this_cpu_inc(bpf_prog_active); | |
db20fd2b AS |
1013 | rcu_read_lock(); |
1014 | err = map->ops->map_delete_elem(map, key); | |
1015 | rcu_read_unlock(); | |
b121d1e7 AS |
1016 | __this_cpu_dec(bpf_prog_active); |
1017 | preempt_enable(); | |
1ae80cf3 | 1018 | maybe_wait_bpf_programs(map); |
a3884572 | 1019 | out: |
db20fd2b AS |
1020 | kfree(key); |
1021 | err_put: | |
1022 | fdput(f); | |
1023 | return err; | |
1024 | } | |
1025 | ||
1026 | /* last field in 'union bpf_attr' used by this command */ | |
1027 | #define BPF_MAP_GET_NEXT_KEY_LAST_FIELD next_key | |
1028 | ||
1029 | static int map_get_next_key(union bpf_attr *attr) | |
1030 | { | |
535e7b4b MS |
1031 | void __user *ukey = u64_to_user_ptr(attr->key); |
1032 | void __user *unext_key = u64_to_user_ptr(attr->next_key); | |
db20fd2b | 1033 | int ufd = attr->map_fd; |
db20fd2b AS |
1034 | struct bpf_map *map; |
1035 | void *key, *next_key; | |
592867bf | 1036 | struct fd f; |
db20fd2b AS |
1037 | int err; |
1038 | ||
1039 | if (CHECK_ATTR(BPF_MAP_GET_NEXT_KEY)) | |
1040 | return -EINVAL; | |
1041 | ||
592867bf | 1042 | f = fdget(ufd); |
c2101297 | 1043 | map = __bpf_map_get(f); |
db20fd2b AS |
1044 | if (IS_ERR(map)) |
1045 | return PTR_ERR(map); | |
87df15de | 1046 | if (!(map_get_sys_perms(map, f) & FMODE_CAN_READ)) { |
6e71b04a CF |
1047 | err = -EPERM; |
1048 | goto err_put; | |
1049 | } | |
1050 | ||
8fe45924 | 1051 | if (ukey) { |
c9d29f46 | 1052 | key = __bpf_copy_key(ukey, map->key_size); |
e4448ed8 AV |
1053 | if (IS_ERR(key)) { |
1054 | err = PTR_ERR(key); | |
8fe45924 | 1055 | goto err_put; |
e4448ed8 | 1056 | } |
8fe45924 TQ |
1057 | } else { |
1058 | key = NULL; | |
1059 | } | |
db20fd2b AS |
1060 | |
1061 | err = -ENOMEM; | |
1062 | next_key = kmalloc(map->key_size, GFP_USER); | |
1063 | if (!next_key) | |
1064 | goto free_key; | |
1065 | ||
a3884572 JK |
1066 | if (bpf_map_is_dev_bound(map)) { |
1067 | err = bpf_map_offload_get_next_key(map, key, next_key); | |
1068 | goto out; | |
1069 | } | |
1070 | ||
db20fd2b AS |
1071 | rcu_read_lock(); |
1072 | err = map->ops->map_get_next_key(map, key, next_key); | |
1073 | rcu_read_unlock(); | |
a3884572 | 1074 | out: |
db20fd2b AS |
1075 | if (err) |
1076 | goto free_next_key; | |
1077 | ||
1078 | err = -EFAULT; | |
1079 | if (copy_to_user(unext_key, next_key, map->key_size) != 0) | |
1080 | goto free_next_key; | |
1081 | ||
1082 | err = 0; | |
1083 | ||
1084 | free_next_key: | |
1085 | kfree(next_key); | |
1086 | free_key: | |
1087 | kfree(key); | |
1088 | err_put: | |
1089 | fdput(f); | |
1090 | return err; | |
1091 | } | |
1092 | ||
bd513cd0 MV |
1093 | #define BPF_MAP_LOOKUP_AND_DELETE_ELEM_LAST_FIELD value |
1094 | ||
1095 | static int map_lookup_and_delete_elem(union bpf_attr *attr) | |
1096 | { | |
1097 | void __user *ukey = u64_to_user_ptr(attr->key); | |
1098 | void __user *uvalue = u64_to_user_ptr(attr->value); | |
1099 | int ufd = attr->map_fd; | |
1100 | struct bpf_map *map; | |
540fefc0 | 1101 | void *key, *value; |
bd513cd0 MV |
1102 | u32 value_size; |
1103 | struct fd f; | |
1104 | int err; | |
1105 | ||
1106 | if (CHECK_ATTR(BPF_MAP_LOOKUP_AND_DELETE_ELEM)) | |
1107 | return -EINVAL; | |
1108 | ||
1109 | f = fdget(ufd); | |
1110 | map = __bpf_map_get(f); | |
1111 | if (IS_ERR(map)) | |
1112 | return PTR_ERR(map); | |
87df15de | 1113 | if (!(map_get_sys_perms(map, f) & FMODE_CAN_WRITE)) { |
bd513cd0 MV |
1114 | err = -EPERM; |
1115 | goto err_put; | |
1116 | } | |
1117 | ||
1118 | key = __bpf_copy_key(ukey, map->key_size); | |
1119 | if (IS_ERR(key)) { | |
1120 | err = PTR_ERR(key); | |
1121 | goto err_put; | |
1122 | } | |
1123 | ||
1124 | value_size = map->value_size; | |
1125 | ||
1126 | err = -ENOMEM; | |
1127 | value = kmalloc(value_size, GFP_USER | __GFP_NOWARN); | |
1128 | if (!value) | |
1129 | goto free_key; | |
1130 | ||
1131 | if (map->map_type == BPF_MAP_TYPE_QUEUE || | |
1132 | map->map_type == BPF_MAP_TYPE_STACK) { | |
1133 | err = map->ops->map_pop_elem(map, value); | |
1134 | } else { | |
1135 | err = -ENOTSUPP; | |
1136 | } | |
1137 | ||
1138 | if (err) | |
1139 | goto free_value; | |
1140 | ||
1141 | if (copy_to_user(uvalue, value, value_size) != 0) | |
1142 | goto free_value; | |
1143 | ||
1144 | err = 0; | |
1145 | ||
1146 | free_value: | |
1147 | kfree(value); | |
1148 | free_key: | |
1149 | kfree(key); | |
1150 | err_put: | |
1151 | fdput(f); | |
1152 | return err; | |
1153 | } | |
1154 | ||
87df15de DB |
1155 | #define BPF_MAP_FREEZE_LAST_FIELD map_fd |
1156 | ||
1157 | static int map_freeze(const union bpf_attr *attr) | |
1158 | { | |
1159 | int err = 0, ufd = attr->map_fd; | |
1160 | struct bpf_map *map; | |
1161 | struct fd f; | |
1162 | ||
1163 | if (CHECK_ATTR(BPF_MAP_FREEZE)) | |
1164 | return -EINVAL; | |
1165 | ||
1166 | f = fdget(ufd); | |
1167 | map = __bpf_map_get(f); | |
1168 | if (IS_ERR(map)) | |
1169 | return PTR_ERR(map); | |
1170 | if (READ_ONCE(map->frozen)) { | |
1171 | err = -EBUSY; | |
1172 | goto err_put; | |
1173 | } | |
1174 | if (!capable(CAP_SYS_ADMIN)) { | |
1175 | err = -EPERM; | |
1176 | goto err_put; | |
1177 | } | |
1178 | ||
1179 | WRITE_ONCE(map->frozen, true); | |
1180 | err_put: | |
1181 | fdput(f); | |
1182 | return err; | |
1183 | } | |
1184 | ||
7de16e3a JK |
1185 | static const struct bpf_prog_ops * const bpf_prog_types[] = { |
1186 | #define BPF_PROG_TYPE(_id, _name) \ | |
1187 | [_id] = & _name ## _prog_ops, | |
1188 | #define BPF_MAP_TYPE(_id, _ops) | |
1189 | #include <linux/bpf_types.h> | |
1190 | #undef BPF_PROG_TYPE | |
1191 | #undef BPF_MAP_TYPE | |
1192 | }; | |
1193 | ||
09756af4 AS |
1194 | static int find_prog_type(enum bpf_prog_type type, struct bpf_prog *prog) |
1195 | { | |
d0f1a451 DB |
1196 | const struct bpf_prog_ops *ops; |
1197 | ||
1198 | if (type >= ARRAY_SIZE(bpf_prog_types)) | |
1199 | return -EINVAL; | |
1200 | type = array_index_nospec(type, ARRAY_SIZE(bpf_prog_types)); | |
1201 | ops = bpf_prog_types[type]; | |
1202 | if (!ops) | |
be9370a7 | 1203 | return -EINVAL; |
09756af4 | 1204 | |
ab3f0063 | 1205 | if (!bpf_prog_is_dev_bound(prog->aux)) |
d0f1a451 | 1206 | prog->aux->ops = ops; |
ab3f0063 JK |
1207 | else |
1208 | prog->aux->ops = &bpf_offload_prog_ops; | |
be9370a7 JB |
1209 | prog->type = type; |
1210 | return 0; | |
09756af4 AS |
1211 | } |
1212 | ||
1213 | /* drop refcnt on maps used by eBPF program and free auxilary data */ | |
1214 | static void free_used_maps(struct bpf_prog_aux *aux) | |
1215 | { | |
8bad74f9 | 1216 | enum bpf_cgroup_storage_type stype; |
09756af4 AS |
1217 | int i; |
1218 | ||
8bad74f9 RG |
1219 | for_each_cgroup_storage_type(stype) { |
1220 | if (!aux->cgroup_storage[stype]) | |
1221 | continue; | |
1222 | bpf_cgroup_storage_release(aux->prog, | |
1223 | aux->cgroup_storage[stype]); | |
1224 | } | |
de9cbbaa | 1225 | |
09756af4 AS |
1226 | for (i = 0; i < aux->used_map_cnt; i++) |
1227 | bpf_map_put(aux->used_maps[i]); | |
1228 | ||
1229 | kfree(aux->used_maps); | |
1230 | } | |
1231 | ||
5ccb071e DB |
1232 | int __bpf_prog_charge(struct user_struct *user, u32 pages) |
1233 | { | |
1234 | unsigned long memlock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
1235 | unsigned long user_bufs; | |
1236 | ||
1237 | if (user) { | |
1238 | user_bufs = atomic_long_add_return(pages, &user->locked_vm); | |
1239 | if (user_bufs > memlock_limit) { | |
1240 | atomic_long_sub(pages, &user->locked_vm); | |
1241 | return -EPERM; | |
1242 | } | |
1243 | } | |
1244 | ||
1245 | return 0; | |
1246 | } | |
1247 | ||
1248 | void __bpf_prog_uncharge(struct user_struct *user, u32 pages) | |
1249 | { | |
1250 | if (user) | |
1251 | atomic_long_sub(pages, &user->locked_vm); | |
1252 | } | |
1253 | ||
aaac3ba9 AS |
1254 | static int bpf_prog_charge_memlock(struct bpf_prog *prog) |
1255 | { | |
1256 | struct user_struct *user = get_current_user(); | |
5ccb071e | 1257 | int ret; |
aaac3ba9 | 1258 | |
5ccb071e DB |
1259 | ret = __bpf_prog_charge(user, prog->pages); |
1260 | if (ret) { | |
aaac3ba9 | 1261 | free_uid(user); |
5ccb071e | 1262 | return ret; |
aaac3ba9 | 1263 | } |
5ccb071e | 1264 | |
aaac3ba9 AS |
1265 | prog->aux->user = user; |
1266 | return 0; | |
1267 | } | |
1268 | ||
1269 | static void bpf_prog_uncharge_memlock(struct bpf_prog *prog) | |
1270 | { | |
1271 | struct user_struct *user = prog->aux->user; | |
1272 | ||
5ccb071e | 1273 | __bpf_prog_uncharge(user, prog->pages); |
aaac3ba9 AS |
1274 | free_uid(user); |
1275 | } | |
1276 | ||
dc4bb0e2 MKL |
1277 | static int bpf_prog_alloc_id(struct bpf_prog *prog) |
1278 | { | |
1279 | int id; | |
1280 | ||
b76354cd | 1281 | idr_preload(GFP_KERNEL); |
dc4bb0e2 MKL |
1282 | spin_lock_bh(&prog_idr_lock); |
1283 | id = idr_alloc_cyclic(&prog_idr, prog, 1, INT_MAX, GFP_ATOMIC); | |
1284 | if (id > 0) | |
1285 | prog->aux->id = id; | |
1286 | spin_unlock_bh(&prog_idr_lock); | |
b76354cd | 1287 | idr_preload_end(); |
dc4bb0e2 MKL |
1288 | |
1289 | /* id is in [1, INT_MAX) */ | |
1290 | if (WARN_ON_ONCE(!id)) | |
1291 | return -ENOSPC; | |
1292 | ||
1293 | return id > 0 ? 0 : id; | |
1294 | } | |
1295 | ||
ad8ad79f | 1296 | void bpf_prog_free_id(struct bpf_prog *prog, bool do_idr_lock) |
dc4bb0e2 | 1297 | { |
ad8ad79f JK |
1298 | /* cBPF to eBPF migrations are currently not in the idr store. |
1299 | * Offloaded programs are removed from the store when their device | |
1300 | * disappears - even if someone grabs an fd to them they are unusable, | |
1301 | * simply waiting for refcnt to drop to be freed. | |
1302 | */ | |
dc4bb0e2 MKL |
1303 | if (!prog->aux->id) |
1304 | return; | |
1305 | ||
b16d9aa4 MKL |
1306 | if (do_idr_lock) |
1307 | spin_lock_bh(&prog_idr_lock); | |
1308 | else | |
1309 | __acquire(&prog_idr_lock); | |
1310 | ||
dc4bb0e2 | 1311 | idr_remove(&prog_idr, prog->aux->id); |
ad8ad79f | 1312 | prog->aux->id = 0; |
b16d9aa4 MKL |
1313 | |
1314 | if (do_idr_lock) | |
1315 | spin_unlock_bh(&prog_idr_lock); | |
1316 | else | |
1317 | __release(&prog_idr_lock); | |
dc4bb0e2 MKL |
1318 | } |
1319 | ||
1aacde3d | 1320 | static void __bpf_prog_put_rcu(struct rcu_head *rcu) |
abf2e7d6 AS |
1321 | { |
1322 | struct bpf_prog_aux *aux = container_of(rcu, struct bpf_prog_aux, rcu); | |
1323 | ||
1324 | free_used_maps(aux); | |
aaac3ba9 | 1325 | bpf_prog_uncharge_memlock(aux->prog); |
afdb09c7 | 1326 | security_bpf_prog_free(aux); |
abf2e7d6 AS |
1327 | bpf_prog_free(aux->prog); |
1328 | } | |
1329 | ||
b16d9aa4 | 1330 | static void __bpf_prog_put(struct bpf_prog *prog, bool do_idr_lock) |
09756af4 | 1331 | { |
a67edbf4 | 1332 | if (atomic_dec_and_test(&prog->aux->refcnt)) { |
6ee52e2a | 1333 | perf_event_bpf_event(prog, PERF_BPF_EVENT_PROG_UNLOAD, 0); |
34ad5580 | 1334 | /* bpf_prog_free_id() must be called first */ |
b16d9aa4 | 1335 | bpf_prog_free_id(prog, do_idr_lock); |
7d1982b4 | 1336 | bpf_prog_kallsyms_del_all(prog); |
838e9690 | 1337 | btf_put(prog->aux->btf); |
ba64e7d8 | 1338 | kvfree(prog->aux->func_info); |
c454a46b | 1339 | bpf_prog_free_linfo(prog); |
4f74d809 | 1340 | |
1aacde3d | 1341 | call_rcu(&prog->aux->rcu, __bpf_prog_put_rcu); |
a67edbf4 | 1342 | } |
09756af4 | 1343 | } |
b16d9aa4 MKL |
1344 | |
1345 | void bpf_prog_put(struct bpf_prog *prog) | |
1346 | { | |
1347 | __bpf_prog_put(prog, true); | |
1348 | } | |
e2e9b654 | 1349 | EXPORT_SYMBOL_GPL(bpf_prog_put); |
09756af4 AS |
1350 | |
1351 | static int bpf_prog_release(struct inode *inode, struct file *filp) | |
1352 | { | |
1353 | struct bpf_prog *prog = filp->private_data; | |
1354 | ||
1aacde3d | 1355 | bpf_prog_put(prog); |
09756af4 AS |
1356 | return 0; |
1357 | } | |
1358 | ||
492ecee8 AS |
1359 | static void bpf_prog_get_stats(const struct bpf_prog *prog, |
1360 | struct bpf_prog_stats *stats) | |
1361 | { | |
1362 | u64 nsecs = 0, cnt = 0; | |
1363 | int cpu; | |
1364 | ||
1365 | for_each_possible_cpu(cpu) { | |
1366 | const struct bpf_prog_stats *st; | |
1367 | unsigned int start; | |
1368 | u64 tnsecs, tcnt; | |
1369 | ||
1370 | st = per_cpu_ptr(prog->aux->stats, cpu); | |
1371 | do { | |
1372 | start = u64_stats_fetch_begin_irq(&st->syncp); | |
1373 | tnsecs = st->nsecs; | |
1374 | tcnt = st->cnt; | |
1375 | } while (u64_stats_fetch_retry_irq(&st->syncp, start)); | |
1376 | nsecs += tnsecs; | |
1377 | cnt += tcnt; | |
1378 | } | |
1379 | stats->nsecs = nsecs; | |
1380 | stats->cnt = cnt; | |
1381 | } | |
1382 | ||
7bd509e3 DB |
1383 | #ifdef CONFIG_PROC_FS |
1384 | static void bpf_prog_show_fdinfo(struct seq_file *m, struct file *filp) | |
1385 | { | |
1386 | const struct bpf_prog *prog = filp->private_data; | |
f1f7714e | 1387 | char prog_tag[sizeof(prog->tag) * 2 + 1] = { }; |
492ecee8 | 1388 | struct bpf_prog_stats stats; |
7bd509e3 | 1389 | |
492ecee8 | 1390 | bpf_prog_get_stats(prog, &stats); |
f1f7714e | 1391 | bin2hex(prog_tag, prog->tag, sizeof(prog->tag)); |
7bd509e3 DB |
1392 | seq_printf(m, |
1393 | "prog_type:\t%u\n" | |
1394 | "prog_jited:\t%u\n" | |
f1f7714e | 1395 | "prog_tag:\t%s\n" |
4316b409 | 1396 | "memlock:\t%llu\n" |
492ecee8 AS |
1397 | "prog_id:\t%u\n" |
1398 | "run_time_ns:\t%llu\n" | |
1399 | "run_cnt:\t%llu\n", | |
7bd509e3 DB |
1400 | prog->type, |
1401 | prog->jited, | |
f1f7714e | 1402 | prog_tag, |
4316b409 | 1403 | prog->pages * 1ULL << PAGE_SHIFT, |
492ecee8 AS |
1404 | prog->aux->id, |
1405 | stats.nsecs, | |
1406 | stats.cnt); | |
7bd509e3 DB |
1407 | } |
1408 | #endif | |
1409 | ||
f66e448c | 1410 | const struct file_operations bpf_prog_fops = { |
7bd509e3 DB |
1411 | #ifdef CONFIG_PROC_FS |
1412 | .show_fdinfo = bpf_prog_show_fdinfo, | |
1413 | #endif | |
1414 | .release = bpf_prog_release, | |
6e71b04a CF |
1415 | .read = bpf_dummy_read, |
1416 | .write = bpf_dummy_write, | |
09756af4 AS |
1417 | }; |
1418 | ||
b2197755 | 1419 | int bpf_prog_new_fd(struct bpf_prog *prog) |
aa79781b | 1420 | { |
afdb09c7 CF |
1421 | int ret; |
1422 | ||
1423 | ret = security_bpf_prog(prog); | |
1424 | if (ret < 0) | |
1425 | return ret; | |
1426 | ||
aa79781b DB |
1427 | return anon_inode_getfd("bpf-prog", &bpf_prog_fops, prog, |
1428 | O_RDWR | O_CLOEXEC); | |
1429 | } | |
1430 | ||
113214be | 1431 | static struct bpf_prog *____bpf_prog_get(struct fd f) |
09756af4 | 1432 | { |
09756af4 AS |
1433 | if (!f.file) |
1434 | return ERR_PTR(-EBADF); | |
09756af4 AS |
1435 | if (f.file->f_op != &bpf_prog_fops) { |
1436 | fdput(f); | |
1437 | return ERR_PTR(-EINVAL); | |
1438 | } | |
1439 | ||
c2101297 | 1440 | return f.file->private_data; |
09756af4 AS |
1441 | } |
1442 | ||
59d3656d | 1443 | struct bpf_prog *bpf_prog_add(struct bpf_prog *prog, int i) |
92117d84 | 1444 | { |
59d3656d BB |
1445 | if (atomic_add_return(i, &prog->aux->refcnt) > BPF_MAX_REFCNT) { |
1446 | atomic_sub(i, &prog->aux->refcnt); | |
92117d84 AS |
1447 | return ERR_PTR(-EBUSY); |
1448 | } | |
1449 | return prog; | |
1450 | } | |
59d3656d BB |
1451 | EXPORT_SYMBOL_GPL(bpf_prog_add); |
1452 | ||
c540594f DB |
1453 | void bpf_prog_sub(struct bpf_prog *prog, int i) |
1454 | { | |
1455 | /* Only to be used for undoing previous bpf_prog_add() in some | |
1456 | * error path. We still know that another entity in our call | |
1457 | * path holds a reference to the program, thus atomic_sub() can | |
1458 | * be safely used in such cases! | |
1459 | */ | |
1460 | WARN_ON(atomic_sub_return(i, &prog->aux->refcnt) == 0); | |
1461 | } | |
1462 | EXPORT_SYMBOL_GPL(bpf_prog_sub); | |
1463 | ||
59d3656d BB |
1464 | struct bpf_prog *bpf_prog_inc(struct bpf_prog *prog) |
1465 | { | |
1466 | return bpf_prog_add(prog, 1); | |
1467 | } | |
97bc402d | 1468 | EXPORT_SYMBOL_GPL(bpf_prog_inc); |
92117d84 | 1469 | |
b16d9aa4 | 1470 | /* prog_idr_lock should have been held */ |
a6f6df69 | 1471 | struct bpf_prog *bpf_prog_inc_not_zero(struct bpf_prog *prog) |
b16d9aa4 MKL |
1472 | { |
1473 | int refold; | |
1474 | ||
bfc18e38 | 1475 | refold = atomic_fetch_add_unless(&prog->aux->refcnt, 1, 0); |
b16d9aa4 MKL |
1476 | |
1477 | if (refold >= BPF_MAX_REFCNT) { | |
1478 | __bpf_prog_put(prog, false); | |
1479 | return ERR_PTR(-EBUSY); | |
1480 | } | |
1481 | ||
1482 | if (!refold) | |
1483 | return ERR_PTR(-ENOENT); | |
1484 | ||
1485 | return prog; | |
1486 | } | |
a6f6df69 | 1487 | EXPORT_SYMBOL_GPL(bpf_prog_inc_not_zero); |
b16d9aa4 | 1488 | |
040ee692 | 1489 | bool bpf_prog_get_ok(struct bpf_prog *prog, |
288b3de5 | 1490 | enum bpf_prog_type *attach_type, bool attach_drv) |
248f346f | 1491 | { |
288b3de5 JK |
1492 | /* not an attachment, just a refcount inc, always allow */ |
1493 | if (!attach_type) | |
1494 | return true; | |
248f346f JK |
1495 | |
1496 | if (prog->type != *attach_type) | |
1497 | return false; | |
288b3de5 | 1498 | if (bpf_prog_is_dev_bound(prog->aux) && !attach_drv) |
248f346f JK |
1499 | return false; |
1500 | ||
1501 | return true; | |
1502 | } | |
1503 | ||
1504 | static struct bpf_prog *__bpf_prog_get(u32 ufd, enum bpf_prog_type *attach_type, | |
288b3de5 | 1505 | bool attach_drv) |
09756af4 AS |
1506 | { |
1507 | struct fd f = fdget(ufd); | |
1508 | struct bpf_prog *prog; | |
1509 | ||
113214be | 1510 | prog = ____bpf_prog_get(f); |
09756af4 AS |
1511 | if (IS_ERR(prog)) |
1512 | return prog; | |
288b3de5 | 1513 | if (!bpf_prog_get_ok(prog, attach_type, attach_drv)) { |
113214be DB |
1514 | prog = ERR_PTR(-EINVAL); |
1515 | goto out; | |
1516 | } | |
09756af4 | 1517 | |
92117d84 | 1518 | prog = bpf_prog_inc(prog); |
113214be | 1519 | out: |
09756af4 AS |
1520 | fdput(f); |
1521 | return prog; | |
1522 | } | |
113214be DB |
1523 | |
1524 | struct bpf_prog *bpf_prog_get(u32 ufd) | |
1525 | { | |
288b3de5 | 1526 | return __bpf_prog_get(ufd, NULL, false); |
113214be DB |
1527 | } |
1528 | ||
248f346f | 1529 | struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type, |
288b3de5 | 1530 | bool attach_drv) |
248f346f | 1531 | { |
4d220ed0 | 1532 | return __bpf_prog_get(ufd, &type, attach_drv); |
248f346f | 1533 | } |
6c8dfe21 | 1534 | EXPORT_SYMBOL_GPL(bpf_prog_get_type_dev); |
248f346f | 1535 | |
aac3fc32 AI |
1536 | /* Initially all BPF programs could be loaded w/o specifying |
1537 | * expected_attach_type. Later for some of them specifying expected_attach_type | |
1538 | * at load time became required so that program could be validated properly. | |
1539 | * Programs of types that are allowed to be loaded both w/ and w/o (for | |
1540 | * backward compatibility) expected_attach_type, should have the default attach | |
1541 | * type assigned to expected_attach_type for the latter case, so that it can be | |
1542 | * validated later at attach time. | |
1543 | * | |
1544 | * bpf_prog_load_fixup_attach_type() sets expected_attach_type in @attr if | |
1545 | * prog type requires it but has some attach types that have to be backward | |
1546 | * compatible. | |
1547 | */ | |
1548 | static void bpf_prog_load_fixup_attach_type(union bpf_attr *attr) | |
1549 | { | |
1550 | switch (attr->prog_type) { | |
1551 | case BPF_PROG_TYPE_CGROUP_SOCK: | |
1552 | /* Unfortunately BPF_ATTACH_TYPE_UNSPEC enumeration doesn't | |
1553 | * exist so checking for non-zero is the way to go here. | |
1554 | */ | |
1555 | if (!attr->expected_attach_type) | |
1556 | attr->expected_attach_type = | |
1557 | BPF_CGROUP_INET_SOCK_CREATE; | |
1558 | break; | |
1559 | } | |
1560 | } | |
1561 | ||
5e43f899 AI |
1562 | static int |
1563 | bpf_prog_load_check_attach_type(enum bpf_prog_type prog_type, | |
1564 | enum bpf_attach_type expected_attach_type) | |
1565 | { | |
4fbac77d | 1566 | switch (prog_type) { |
aac3fc32 AI |
1567 | case BPF_PROG_TYPE_CGROUP_SOCK: |
1568 | switch (expected_attach_type) { | |
1569 | case BPF_CGROUP_INET_SOCK_CREATE: | |
1570 | case BPF_CGROUP_INET4_POST_BIND: | |
1571 | case BPF_CGROUP_INET6_POST_BIND: | |
1572 | return 0; | |
1573 | default: | |
1574 | return -EINVAL; | |
1575 | } | |
4fbac77d AI |
1576 | case BPF_PROG_TYPE_CGROUP_SOCK_ADDR: |
1577 | switch (expected_attach_type) { | |
1578 | case BPF_CGROUP_INET4_BIND: | |
1579 | case BPF_CGROUP_INET6_BIND: | |
d74bad4e AI |
1580 | case BPF_CGROUP_INET4_CONNECT: |
1581 | case BPF_CGROUP_INET6_CONNECT: | |
1cedee13 AI |
1582 | case BPF_CGROUP_UDP4_SENDMSG: |
1583 | case BPF_CGROUP_UDP6_SENDMSG: | |
4fbac77d AI |
1584 | return 0; |
1585 | default: | |
1586 | return -EINVAL; | |
1587 | } | |
1588 | default: | |
1589 | return 0; | |
1590 | } | |
5e43f899 AI |
1591 | } |
1592 | ||
09756af4 | 1593 | /* last field in 'union bpf_attr' used by this command */ |
c454a46b | 1594 | #define BPF_PROG_LOAD_LAST_FIELD line_info_cnt |
09756af4 | 1595 | |
838e9690 | 1596 | static int bpf_prog_load(union bpf_attr *attr, union bpf_attr __user *uattr) |
09756af4 AS |
1597 | { |
1598 | enum bpf_prog_type type = attr->prog_type; | |
1599 | struct bpf_prog *prog; | |
1600 | int err; | |
1601 | char license[128]; | |
1602 | bool is_gpl; | |
1603 | ||
1604 | if (CHECK_ATTR(BPF_PROG_LOAD)) | |
1605 | return -EINVAL; | |
1606 | ||
e9ee9efc | 1607 | if (attr->prog_flags & ~(BPF_F_STRICT_ALIGNMENT | BPF_F_ANY_ALIGNMENT)) |
e07b98d9 DM |
1608 | return -EINVAL; |
1609 | ||
e9ee9efc DM |
1610 | if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && |
1611 | (attr->prog_flags & BPF_F_ANY_ALIGNMENT) && | |
1612 | !capable(CAP_SYS_ADMIN)) | |
1613 | return -EPERM; | |
1614 | ||
09756af4 | 1615 | /* copy eBPF program license from user space */ |
535e7b4b | 1616 | if (strncpy_from_user(license, u64_to_user_ptr(attr->license), |
09756af4 AS |
1617 | sizeof(license) - 1) < 0) |
1618 | return -EFAULT; | |
1619 | license[sizeof(license) - 1] = 0; | |
1620 | ||
1621 | /* eBPF programs must be GPL compatible to use GPL-ed functions */ | |
1622 | is_gpl = license_is_gpl_compatible(license); | |
1623 | ||
c04c0d2b AS |
1624 | if (attr->insn_cnt == 0 || |
1625 | attr->insn_cnt > (capable(CAP_SYS_ADMIN) ? BPF_COMPLEXITY_LIMIT_INSNS : BPF_MAXINSNS)) | |
ef0915ca | 1626 | return -E2BIG; |
80b7d819 CF |
1627 | if (type != BPF_PROG_TYPE_SOCKET_FILTER && |
1628 | type != BPF_PROG_TYPE_CGROUP_SKB && | |
1629 | !capable(CAP_SYS_ADMIN)) | |
1be7f75d AS |
1630 | return -EPERM; |
1631 | ||
aac3fc32 | 1632 | bpf_prog_load_fixup_attach_type(attr); |
5e43f899 AI |
1633 | if (bpf_prog_load_check_attach_type(type, attr->expected_attach_type)) |
1634 | return -EINVAL; | |
1635 | ||
09756af4 AS |
1636 | /* plain bpf_prog allocation */ |
1637 | prog = bpf_prog_alloc(bpf_prog_size(attr->insn_cnt), GFP_USER); | |
1638 | if (!prog) | |
1639 | return -ENOMEM; | |
1640 | ||
5e43f899 AI |
1641 | prog->expected_attach_type = attr->expected_attach_type; |
1642 | ||
9a18eedb JK |
1643 | prog->aux->offload_requested = !!attr->prog_ifindex; |
1644 | ||
afdb09c7 | 1645 | err = security_bpf_prog_alloc(prog->aux); |
aaac3ba9 AS |
1646 | if (err) |
1647 | goto free_prog_nouncharge; | |
1648 | ||
afdb09c7 CF |
1649 | err = bpf_prog_charge_memlock(prog); |
1650 | if (err) | |
1651 | goto free_prog_sec; | |
1652 | ||
09756af4 AS |
1653 | prog->len = attr->insn_cnt; |
1654 | ||
1655 | err = -EFAULT; | |
535e7b4b | 1656 | if (copy_from_user(prog->insns, u64_to_user_ptr(attr->insns), |
aafe6ae9 | 1657 | bpf_prog_insn_size(prog)) != 0) |
09756af4 AS |
1658 | goto free_prog; |
1659 | ||
1660 | prog->orig_prog = NULL; | |
a91263d5 | 1661 | prog->jited = 0; |
09756af4 AS |
1662 | |
1663 | atomic_set(&prog->aux->refcnt, 1); | |
a91263d5 | 1664 | prog->gpl_compatible = is_gpl ? 1 : 0; |
09756af4 | 1665 | |
9a18eedb | 1666 | if (bpf_prog_is_dev_bound(prog->aux)) { |
ab3f0063 JK |
1667 | err = bpf_prog_offload_init(prog, attr); |
1668 | if (err) | |
1669 | goto free_prog; | |
1670 | } | |
1671 | ||
09756af4 AS |
1672 | /* find program type: socket_filter vs tracing_filter */ |
1673 | err = find_prog_type(type, prog); | |
1674 | if (err < 0) | |
1675 | goto free_prog; | |
1676 | ||
cb4d2b3f MKL |
1677 | prog->aux->load_time = ktime_get_boot_ns(); |
1678 | err = bpf_obj_name_cpy(prog->aux->name, attr->prog_name); | |
1679 | if (err) | |
1680 | goto free_prog; | |
1681 | ||
09756af4 | 1682 | /* run eBPF verifier */ |
838e9690 | 1683 | err = bpf_check(&prog, attr, uattr); |
09756af4 AS |
1684 | if (err < 0) |
1685 | goto free_used_maps; | |
1686 | ||
9facc336 | 1687 | prog = bpf_prog_select_runtime(prog, &err); |
04fd61ab AS |
1688 | if (err < 0) |
1689 | goto free_used_maps; | |
09756af4 | 1690 | |
dc4bb0e2 MKL |
1691 | err = bpf_prog_alloc_id(prog); |
1692 | if (err) | |
1693 | goto free_used_maps; | |
1694 | ||
aa79781b | 1695 | err = bpf_prog_new_fd(prog); |
b16d9aa4 MKL |
1696 | if (err < 0) { |
1697 | /* failed to allocate fd. | |
1698 | * bpf_prog_put() is needed because the above | |
1699 | * bpf_prog_alloc_id() has published the prog | |
1700 | * to the userspace and the userspace may | |
1701 | * have refcnt-ed it through BPF_PROG_GET_FD_BY_ID. | |
1702 | */ | |
1703 | bpf_prog_put(prog); | |
1704 | return err; | |
1705 | } | |
09756af4 | 1706 | |
74451e66 | 1707 | bpf_prog_kallsyms_add(prog); |
6ee52e2a | 1708 | perf_event_bpf_event(prog, PERF_BPF_EVENT_PROG_LOAD, 0); |
09756af4 AS |
1709 | return err; |
1710 | ||
1711 | free_used_maps: | |
c454a46b | 1712 | bpf_prog_free_linfo(prog); |
5482e9a9 MKL |
1713 | kvfree(prog->aux->func_info); |
1714 | btf_put(prog->aux->btf); | |
7d1982b4 | 1715 | bpf_prog_kallsyms_del_subprogs(prog); |
09756af4 AS |
1716 | free_used_maps(prog->aux); |
1717 | free_prog: | |
aaac3ba9 | 1718 | bpf_prog_uncharge_memlock(prog); |
afdb09c7 CF |
1719 | free_prog_sec: |
1720 | security_bpf_prog_free(prog->aux); | |
aaac3ba9 | 1721 | free_prog_nouncharge: |
09756af4 AS |
1722 | bpf_prog_free(prog); |
1723 | return err; | |
1724 | } | |
1725 | ||
6e71b04a | 1726 | #define BPF_OBJ_LAST_FIELD file_flags |
b2197755 DB |
1727 | |
1728 | static int bpf_obj_pin(const union bpf_attr *attr) | |
1729 | { | |
6e71b04a | 1730 | if (CHECK_ATTR(BPF_OBJ) || attr->file_flags != 0) |
b2197755 DB |
1731 | return -EINVAL; |
1732 | ||
535e7b4b | 1733 | return bpf_obj_pin_user(attr->bpf_fd, u64_to_user_ptr(attr->pathname)); |
b2197755 DB |
1734 | } |
1735 | ||
1736 | static int bpf_obj_get(const union bpf_attr *attr) | |
1737 | { | |
6e71b04a CF |
1738 | if (CHECK_ATTR(BPF_OBJ) || attr->bpf_fd != 0 || |
1739 | attr->file_flags & ~BPF_OBJ_FLAG_MASK) | |
b2197755 DB |
1740 | return -EINVAL; |
1741 | ||
6e71b04a CF |
1742 | return bpf_obj_get_user(u64_to_user_ptr(attr->pathname), |
1743 | attr->file_flags); | |
b2197755 DB |
1744 | } |
1745 | ||
c4f6699d AS |
1746 | struct bpf_raw_tracepoint { |
1747 | struct bpf_raw_event_map *btp; | |
1748 | struct bpf_prog *prog; | |
1749 | }; | |
1750 | ||
1751 | static int bpf_raw_tracepoint_release(struct inode *inode, struct file *filp) | |
1752 | { | |
1753 | struct bpf_raw_tracepoint *raw_tp = filp->private_data; | |
1754 | ||
1755 | if (raw_tp->prog) { | |
1756 | bpf_probe_unregister(raw_tp->btp, raw_tp->prog); | |
1757 | bpf_prog_put(raw_tp->prog); | |
1758 | } | |
a38d1107 | 1759 | bpf_put_raw_tracepoint(raw_tp->btp); |
c4f6699d AS |
1760 | kfree(raw_tp); |
1761 | return 0; | |
1762 | } | |
1763 | ||
1764 | static const struct file_operations bpf_raw_tp_fops = { | |
1765 | .release = bpf_raw_tracepoint_release, | |
1766 | .read = bpf_dummy_read, | |
1767 | .write = bpf_dummy_write, | |
1768 | }; | |
1769 | ||
1770 | #define BPF_RAW_TRACEPOINT_OPEN_LAST_FIELD raw_tracepoint.prog_fd | |
1771 | ||
1772 | static int bpf_raw_tracepoint_open(const union bpf_attr *attr) | |
1773 | { | |
1774 | struct bpf_raw_tracepoint *raw_tp; | |
1775 | struct bpf_raw_event_map *btp; | |
1776 | struct bpf_prog *prog; | |
1777 | char tp_name[128]; | |
1778 | int tp_fd, err; | |
1779 | ||
1780 | if (strncpy_from_user(tp_name, u64_to_user_ptr(attr->raw_tracepoint.name), | |
1781 | sizeof(tp_name) - 1) < 0) | |
1782 | return -EFAULT; | |
1783 | tp_name[sizeof(tp_name) - 1] = 0; | |
1784 | ||
a38d1107 | 1785 | btp = bpf_get_raw_tracepoint(tp_name); |
c4f6699d AS |
1786 | if (!btp) |
1787 | return -ENOENT; | |
1788 | ||
1789 | raw_tp = kzalloc(sizeof(*raw_tp), GFP_USER); | |
a38d1107 MM |
1790 | if (!raw_tp) { |
1791 | err = -ENOMEM; | |
1792 | goto out_put_btp; | |
1793 | } | |
c4f6699d AS |
1794 | raw_tp->btp = btp; |
1795 | ||
9df1c28b | 1796 | prog = bpf_prog_get(attr->raw_tracepoint.prog_fd); |
c4f6699d AS |
1797 | if (IS_ERR(prog)) { |
1798 | err = PTR_ERR(prog); | |
1799 | goto out_free_tp; | |
1800 | } | |
9df1c28b MM |
1801 | if (prog->type != BPF_PROG_TYPE_RAW_TRACEPOINT && |
1802 | prog->type != BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE) { | |
1803 | err = -EINVAL; | |
1804 | goto out_put_prog; | |
1805 | } | |
c4f6699d AS |
1806 | |
1807 | err = bpf_probe_register(raw_tp->btp, prog); | |
1808 | if (err) | |
1809 | goto out_put_prog; | |
1810 | ||
1811 | raw_tp->prog = prog; | |
1812 | tp_fd = anon_inode_getfd("bpf-raw-tracepoint", &bpf_raw_tp_fops, raw_tp, | |
1813 | O_CLOEXEC); | |
1814 | if (tp_fd < 0) { | |
1815 | bpf_probe_unregister(raw_tp->btp, prog); | |
1816 | err = tp_fd; | |
1817 | goto out_put_prog; | |
1818 | } | |
1819 | return tp_fd; | |
1820 | ||
1821 | out_put_prog: | |
1822 | bpf_prog_put(prog); | |
1823 | out_free_tp: | |
1824 | kfree(raw_tp); | |
a38d1107 MM |
1825 | out_put_btp: |
1826 | bpf_put_raw_tracepoint(btp); | |
c4f6699d AS |
1827 | return err; |
1828 | } | |
1829 | ||
33491588 AR |
1830 | static int bpf_prog_attach_check_attach_type(const struct bpf_prog *prog, |
1831 | enum bpf_attach_type attach_type) | |
1832 | { | |
1833 | switch (prog->type) { | |
1834 | case BPF_PROG_TYPE_CGROUP_SOCK: | |
1835 | case BPF_PROG_TYPE_CGROUP_SOCK_ADDR: | |
1836 | return attach_type == prog->expected_attach_type ? 0 : -EINVAL; | |
1837 | default: | |
1838 | return 0; | |
1839 | } | |
1840 | } | |
1841 | ||
464bc0fd | 1842 | #define BPF_PROG_ATTACH_LAST_FIELD attach_flags |
174a79ff | 1843 | |
324bda9e AS |
1844 | #define BPF_F_ATTACH_MASK \ |
1845 | (BPF_F_ALLOW_OVERRIDE | BPF_F_ALLOW_MULTI) | |
1846 | ||
f4324551 DM |
1847 | static int bpf_prog_attach(const union bpf_attr *attr) |
1848 | { | |
7f677633 | 1849 | enum bpf_prog_type ptype; |
f4324551 | 1850 | struct bpf_prog *prog; |
7f677633 | 1851 | int ret; |
f4324551 DM |
1852 | |
1853 | if (!capable(CAP_NET_ADMIN)) | |
1854 | return -EPERM; | |
1855 | ||
1856 | if (CHECK_ATTR(BPF_PROG_ATTACH)) | |
1857 | return -EINVAL; | |
1858 | ||
324bda9e | 1859 | if (attr->attach_flags & ~BPF_F_ATTACH_MASK) |
7f677633 AS |
1860 | return -EINVAL; |
1861 | ||
f4324551 DM |
1862 | switch (attr->attach_type) { |
1863 | case BPF_CGROUP_INET_INGRESS: | |
1864 | case BPF_CGROUP_INET_EGRESS: | |
b2cd1257 | 1865 | ptype = BPF_PROG_TYPE_CGROUP_SKB; |
f4324551 | 1866 | break; |
61023658 | 1867 | case BPF_CGROUP_INET_SOCK_CREATE: |
aac3fc32 AI |
1868 | case BPF_CGROUP_INET4_POST_BIND: |
1869 | case BPF_CGROUP_INET6_POST_BIND: | |
61023658 DA |
1870 | ptype = BPF_PROG_TYPE_CGROUP_SOCK; |
1871 | break; | |
4fbac77d AI |
1872 | case BPF_CGROUP_INET4_BIND: |
1873 | case BPF_CGROUP_INET6_BIND: | |
d74bad4e AI |
1874 | case BPF_CGROUP_INET4_CONNECT: |
1875 | case BPF_CGROUP_INET6_CONNECT: | |
1cedee13 AI |
1876 | case BPF_CGROUP_UDP4_SENDMSG: |
1877 | case BPF_CGROUP_UDP6_SENDMSG: | |
4fbac77d AI |
1878 | ptype = BPF_PROG_TYPE_CGROUP_SOCK_ADDR; |
1879 | break; | |
40304b2a LB |
1880 | case BPF_CGROUP_SOCK_OPS: |
1881 | ptype = BPF_PROG_TYPE_SOCK_OPS; | |
1882 | break; | |
ebc614f6 RG |
1883 | case BPF_CGROUP_DEVICE: |
1884 | ptype = BPF_PROG_TYPE_CGROUP_DEVICE; | |
1885 | break; | |
4f738adb | 1886 | case BPF_SK_MSG_VERDICT: |
fdb5c453 SY |
1887 | ptype = BPF_PROG_TYPE_SK_MSG; |
1888 | break; | |
464bc0fd JF |
1889 | case BPF_SK_SKB_STREAM_PARSER: |
1890 | case BPF_SK_SKB_STREAM_VERDICT: | |
fdb5c453 SY |
1891 | ptype = BPF_PROG_TYPE_SK_SKB; |
1892 | break; | |
f4364dcf | 1893 | case BPF_LIRC_MODE2: |
fdb5c453 SY |
1894 | ptype = BPF_PROG_TYPE_LIRC_MODE2; |
1895 | break; | |
d58e468b PP |
1896 | case BPF_FLOW_DISSECTOR: |
1897 | ptype = BPF_PROG_TYPE_FLOW_DISSECTOR; | |
1898 | break; | |
7b146ceb AI |
1899 | case BPF_CGROUP_SYSCTL: |
1900 | ptype = BPF_PROG_TYPE_CGROUP_SYSCTL; | |
1901 | break; | |
f4324551 DM |
1902 | default: |
1903 | return -EINVAL; | |
1904 | } | |
1905 | ||
b2cd1257 DA |
1906 | prog = bpf_prog_get_type(attr->attach_bpf_fd, ptype); |
1907 | if (IS_ERR(prog)) | |
1908 | return PTR_ERR(prog); | |
1909 | ||
5e43f899 AI |
1910 | if (bpf_prog_attach_check_attach_type(prog, attr->attach_type)) { |
1911 | bpf_prog_put(prog); | |
1912 | return -EINVAL; | |
1913 | } | |
1914 | ||
fdb5c453 SY |
1915 | switch (ptype) { |
1916 | case BPF_PROG_TYPE_SK_SKB: | |
1917 | case BPF_PROG_TYPE_SK_MSG: | |
604326b4 | 1918 | ret = sock_map_get_from_fd(attr, prog); |
fdb5c453 SY |
1919 | break; |
1920 | case BPF_PROG_TYPE_LIRC_MODE2: | |
1921 | ret = lirc_prog_attach(attr, prog); | |
1922 | break; | |
d58e468b PP |
1923 | case BPF_PROG_TYPE_FLOW_DISSECTOR: |
1924 | ret = skb_flow_dissector_bpf_prog_attach(attr, prog); | |
1925 | break; | |
fdb5c453 SY |
1926 | default: |
1927 | ret = cgroup_bpf_prog_attach(attr, ptype, prog); | |
b2cd1257 DA |
1928 | } |
1929 | ||
7f677633 AS |
1930 | if (ret) |
1931 | bpf_prog_put(prog); | |
7f677633 | 1932 | return ret; |
f4324551 DM |
1933 | } |
1934 | ||
1935 | #define BPF_PROG_DETACH_LAST_FIELD attach_type | |
1936 | ||
1937 | static int bpf_prog_detach(const union bpf_attr *attr) | |
1938 | { | |
324bda9e | 1939 | enum bpf_prog_type ptype; |
f4324551 DM |
1940 | |
1941 | if (!capable(CAP_NET_ADMIN)) | |
1942 | return -EPERM; | |
1943 | ||
1944 | if (CHECK_ATTR(BPF_PROG_DETACH)) | |
1945 | return -EINVAL; | |
1946 | ||
1947 | switch (attr->attach_type) { | |
1948 | case BPF_CGROUP_INET_INGRESS: | |
1949 | case BPF_CGROUP_INET_EGRESS: | |
324bda9e AS |
1950 | ptype = BPF_PROG_TYPE_CGROUP_SKB; |
1951 | break; | |
61023658 | 1952 | case BPF_CGROUP_INET_SOCK_CREATE: |
aac3fc32 AI |
1953 | case BPF_CGROUP_INET4_POST_BIND: |
1954 | case BPF_CGROUP_INET6_POST_BIND: | |
324bda9e AS |
1955 | ptype = BPF_PROG_TYPE_CGROUP_SOCK; |
1956 | break; | |
4fbac77d AI |
1957 | case BPF_CGROUP_INET4_BIND: |
1958 | case BPF_CGROUP_INET6_BIND: | |
d74bad4e AI |
1959 | case BPF_CGROUP_INET4_CONNECT: |
1960 | case BPF_CGROUP_INET6_CONNECT: | |
1cedee13 AI |
1961 | case BPF_CGROUP_UDP4_SENDMSG: |
1962 | case BPF_CGROUP_UDP6_SENDMSG: | |
4fbac77d AI |
1963 | ptype = BPF_PROG_TYPE_CGROUP_SOCK_ADDR; |
1964 | break; | |
40304b2a | 1965 | case BPF_CGROUP_SOCK_OPS: |
324bda9e | 1966 | ptype = BPF_PROG_TYPE_SOCK_OPS; |
f4324551 | 1967 | break; |
ebc614f6 RG |
1968 | case BPF_CGROUP_DEVICE: |
1969 | ptype = BPF_PROG_TYPE_CGROUP_DEVICE; | |
1970 | break; | |
4f738adb | 1971 | case BPF_SK_MSG_VERDICT: |
604326b4 | 1972 | return sock_map_get_from_fd(attr, NULL); |
5a67da2a JF |
1973 | case BPF_SK_SKB_STREAM_PARSER: |
1974 | case BPF_SK_SKB_STREAM_VERDICT: | |
604326b4 | 1975 | return sock_map_get_from_fd(attr, NULL); |
f4364dcf SY |
1976 | case BPF_LIRC_MODE2: |
1977 | return lirc_prog_detach(attr); | |
d58e468b PP |
1978 | case BPF_FLOW_DISSECTOR: |
1979 | return skb_flow_dissector_bpf_prog_detach(attr); | |
7b146ceb AI |
1980 | case BPF_CGROUP_SYSCTL: |
1981 | ptype = BPF_PROG_TYPE_CGROUP_SYSCTL; | |
1982 | break; | |
f4324551 DM |
1983 | default: |
1984 | return -EINVAL; | |
1985 | } | |
1986 | ||
fdb5c453 | 1987 | return cgroup_bpf_prog_detach(attr, ptype); |
f4324551 | 1988 | } |
40304b2a | 1989 | |
468e2f64 AS |
1990 | #define BPF_PROG_QUERY_LAST_FIELD query.prog_cnt |
1991 | ||
1992 | static int bpf_prog_query(const union bpf_attr *attr, | |
1993 | union bpf_attr __user *uattr) | |
1994 | { | |
468e2f64 AS |
1995 | if (!capable(CAP_NET_ADMIN)) |
1996 | return -EPERM; | |
1997 | if (CHECK_ATTR(BPF_PROG_QUERY)) | |
1998 | return -EINVAL; | |
1999 | if (attr->query.query_flags & ~BPF_F_QUERY_EFFECTIVE) | |
2000 | return -EINVAL; | |
2001 | ||
2002 | switch (attr->query.attach_type) { | |
2003 | case BPF_CGROUP_INET_INGRESS: | |
2004 | case BPF_CGROUP_INET_EGRESS: | |
2005 | case BPF_CGROUP_INET_SOCK_CREATE: | |
4fbac77d AI |
2006 | case BPF_CGROUP_INET4_BIND: |
2007 | case BPF_CGROUP_INET6_BIND: | |
aac3fc32 AI |
2008 | case BPF_CGROUP_INET4_POST_BIND: |
2009 | case BPF_CGROUP_INET6_POST_BIND: | |
d74bad4e AI |
2010 | case BPF_CGROUP_INET4_CONNECT: |
2011 | case BPF_CGROUP_INET6_CONNECT: | |
1cedee13 AI |
2012 | case BPF_CGROUP_UDP4_SENDMSG: |
2013 | case BPF_CGROUP_UDP6_SENDMSG: | |
468e2f64 | 2014 | case BPF_CGROUP_SOCK_OPS: |
ebc614f6 | 2015 | case BPF_CGROUP_DEVICE: |
7b146ceb | 2016 | case BPF_CGROUP_SYSCTL: |
468e2f64 | 2017 | break; |
f4364dcf SY |
2018 | case BPF_LIRC_MODE2: |
2019 | return lirc_prog_query(attr, uattr); | |
118c8e9a SF |
2020 | case BPF_FLOW_DISSECTOR: |
2021 | return skb_flow_dissector_prog_query(attr, uattr); | |
468e2f64 AS |
2022 | default: |
2023 | return -EINVAL; | |
2024 | } | |
fdb5c453 SY |
2025 | |
2026 | return cgroup_bpf_prog_query(attr, uattr); | |
468e2f64 | 2027 | } |
f4324551 | 2028 | |
b0b9395d | 2029 | #define BPF_PROG_TEST_RUN_LAST_FIELD test.ctx_out |
1cf1cae9 AS |
2030 | |
2031 | static int bpf_prog_test_run(const union bpf_attr *attr, | |
2032 | union bpf_attr __user *uattr) | |
2033 | { | |
2034 | struct bpf_prog *prog; | |
2035 | int ret = -ENOTSUPP; | |
2036 | ||
61f3c964 AS |
2037 | if (!capable(CAP_SYS_ADMIN)) |
2038 | return -EPERM; | |
1cf1cae9 AS |
2039 | if (CHECK_ATTR(BPF_PROG_TEST_RUN)) |
2040 | return -EINVAL; | |
2041 | ||
b0b9395d SF |
2042 | if ((attr->test.ctx_size_in && !attr->test.ctx_in) || |
2043 | (!attr->test.ctx_size_in && attr->test.ctx_in)) | |
2044 | return -EINVAL; | |
2045 | ||
2046 | if ((attr->test.ctx_size_out && !attr->test.ctx_out) || | |
2047 | (!attr->test.ctx_size_out && attr->test.ctx_out)) | |
2048 | return -EINVAL; | |
2049 | ||
1cf1cae9 AS |
2050 | prog = bpf_prog_get(attr->test.prog_fd); |
2051 | if (IS_ERR(prog)) | |
2052 | return PTR_ERR(prog); | |
2053 | ||
2054 | if (prog->aux->ops->test_run) | |
2055 | ret = prog->aux->ops->test_run(prog, attr, uattr); | |
2056 | ||
2057 | bpf_prog_put(prog); | |
2058 | return ret; | |
2059 | } | |
2060 | ||
34ad5580 MKL |
2061 | #define BPF_OBJ_GET_NEXT_ID_LAST_FIELD next_id |
2062 | ||
2063 | static int bpf_obj_get_next_id(const union bpf_attr *attr, | |
2064 | union bpf_attr __user *uattr, | |
2065 | struct idr *idr, | |
2066 | spinlock_t *lock) | |
2067 | { | |
2068 | u32 next_id = attr->start_id; | |
2069 | int err = 0; | |
2070 | ||
2071 | if (CHECK_ATTR(BPF_OBJ_GET_NEXT_ID) || next_id >= INT_MAX) | |
2072 | return -EINVAL; | |
2073 | ||
2074 | if (!capable(CAP_SYS_ADMIN)) | |
2075 | return -EPERM; | |
2076 | ||
2077 | next_id++; | |
2078 | spin_lock_bh(lock); | |
2079 | if (!idr_get_next(idr, &next_id)) | |
2080 | err = -ENOENT; | |
2081 | spin_unlock_bh(lock); | |
2082 | ||
2083 | if (!err) | |
2084 | err = put_user(next_id, &uattr->next_id); | |
2085 | ||
2086 | return err; | |
2087 | } | |
2088 | ||
b16d9aa4 MKL |
2089 | #define BPF_PROG_GET_FD_BY_ID_LAST_FIELD prog_id |
2090 | ||
2091 | static int bpf_prog_get_fd_by_id(const union bpf_attr *attr) | |
2092 | { | |
2093 | struct bpf_prog *prog; | |
2094 | u32 id = attr->prog_id; | |
2095 | int fd; | |
2096 | ||
2097 | if (CHECK_ATTR(BPF_PROG_GET_FD_BY_ID)) | |
2098 | return -EINVAL; | |
2099 | ||
2100 | if (!capable(CAP_SYS_ADMIN)) | |
2101 | return -EPERM; | |
2102 | ||
2103 | spin_lock_bh(&prog_idr_lock); | |
2104 | prog = idr_find(&prog_idr, id); | |
2105 | if (prog) | |
2106 | prog = bpf_prog_inc_not_zero(prog); | |
2107 | else | |
2108 | prog = ERR_PTR(-ENOENT); | |
2109 | spin_unlock_bh(&prog_idr_lock); | |
2110 | ||
2111 | if (IS_ERR(prog)) | |
2112 | return PTR_ERR(prog); | |
2113 | ||
2114 | fd = bpf_prog_new_fd(prog); | |
2115 | if (fd < 0) | |
2116 | bpf_prog_put(prog); | |
2117 | ||
2118 | return fd; | |
2119 | } | |
2120 | ||
6e71b04a | 2121 | #define BPF_MAP_GET_FD_BY_ID_LAST_FIELD open_flags |
bd5f5f4e MKL |
2122 | |
2123 | static int bpf_map_get_fd_by_id(const union bpf_attr *attr) | |
2124 | { | |
2125 | struct bpf_map *map; | |
2126 | u32 id = attr->map_id; | |
6e71b04a | 2127 | int f_flags; |
bd5f5f4e MKL |
2128 | int fd; |
2129 | ||
6e71b04a CF |
2130 | if (CHECK_ATTR(BPF_MAP_GET_FD_BY_ID) || |
2131 | attr->open_flags & ~BPF_OBJ_FLAG_MASK) | |
bd5f5f4e MKL |
2132 | return -EINVAL; |
2133 | ||
2134 | if (!capable(CAP_SYS_ADMIN)) | |
2135 | return -EPERM; | |
2136 | ||
6e71b04a CF |
2137 | f_flags = bpf_get_file_flag(attr->open_flags); |
2138 | if (f_flags < 0) | |
2139 | return f_flags; | |
2140 | ||
bd5f5f4e MKL |
2141 | spin_lock_bh(&map_idr_lock); |
2142 | map = idr_find(&map_idr, id); | |
2143 | if (map) | |
2144 | map = bpf_map_inc_not_zero(map, true); | |
2145 | else | |
2146 | map = ERR_PTR(-ENOENT); | |
2147 | spin_unlock_bh(&map_idr_lock); | |
2148 | ||
2149 | if (IS_ERR(map)) | |
2150 | return PTR_ERR(map); | |
2151 | ||
6e71b04a | 2152 | fd = bpf_map_new_fd(map, f_flags); |
bd5f5f4e | 2153 | if (fd < 0) |
781e6282 | 2154 | bpf_map_put_with_uref(map); |
bd5f5f4e MKL |
2155 | |
2156 | return fd; | |
2157 | } | |
2158 | ||
7105e828 | 2159 | static const struct bpf_map *bpf_map_from_imm(const struct bpf_prog *prog, |
d8eca5bb DB |
2160 | unsigned long addr, u32 *off, |
2161 | u32 *type) | |
7105e828 | 2162 | { |
d8eca5bb | 2163 | const struct bpf_map *map; |
7105e828 DB |
2164 | int i; |
2165 | ||
d8eca5bb DB |
2166 | for (i = 0, *off = 0; i < prog->aux->used_map_cnt; i++) { |
2167 | map = prog->aux->used_maps[i]; | |
2168 | if (map == (void *)addr) { | |
2169 | *type = BPF_PSEUDO_MAP_FD; | |
2170 | return map; | |
2171 | } | |
2172 | if (!map->ops->map_direct_value_meta) | |
2173 | continue; | |
2174 | if (!map->ops->map_direct_value_meta(map, addr, off)) { | |
2175 | *type = BPF_PSEUDO_MAP_VALUE; | |
2176 | return map; | |
2177 | } | |
2178 | } | |
2179 | ||
7105e828 DB |
2180 | return NULL; |
2181 | } | |
2182 | ||
2183 | static struct bpf_insn *bpf_insn_prepare_dump(const struct bpf_prog *prog) | |
2184 | { | |
2185 | const struct bpf_map *map; | |
2186 | struct bpf_insn *insns; | |
d8eca5bb | 2187 | u32 off, type; |
7105e828 DB |
2188 | u64 imm; |
2189 | int i; | |
2190 | ||
2191 | insns = kmemdup(prog->insnsi, bpf_prog_insn_size(prog), | |
2192 | GFP_USER); | |
2193 | if (!insns) | |
2194 | return insns; | |
2195 | ||
2196 | for (i = 0; i < prog->len; i++) { | |
2197 | if (insns[i].code == (BPF_JMP | BPF_TAIL_CALL)) { | |
2198 | insns[i].code = BPF_JMP | BPF_CALL; | |
2199 | insns[i].imm = BPF_FUNC_tail_call; | |
2200 | /* fall-through */ | |
2201 | } | |
2202 | if (insns[i].code == (BPF_JMP | BPF_CALL) || | |
2203 | insns[i].code == (BPF_JMP | BPF_CALL_ARGS)) { | |
2204 | if (insns[i].code == (BPF_JMP | BPF_CALL_ARGS)) | |
2205 | insns[i].code = BPF_JMP | BPF_CALL; | |
2206 | if (!bpf_dump_raw_ok()) | |
2207 | insns[i].imm = 0; | |
2208 | continue; | |
2209 | } | |
2210 | ||
2211 | if (insns[i].code != (BPF_LD | BPF_IMM | BPF_DW)) | |
2212 | continue; | |
2213 | ||
2214 | imm = ((u64)insns[i + 1].imm << 32) | (u32)insns[i].imm; | |
d8eca5bb | 2215 | map = bpf_map_from_imm(prog, imm, &off, &type); |
7105e828 | 2216 | if (map) { |
d8eca5bb | 2217 | insns[i].src_reg = type; |
7105e828 | 2218 | insns[i].imm = map->id; |
d8eca5bb | 2219 | insns[i + 1].imm = off; |
7105e828 DB |
2220 | continue; |
2221 | } | |
7105e828 DB |
2222 | } |
2223 | ||
2224 | return insns; | |
2225 | } | |
2226 | ||
c454a46b MKL |
2227 | static int set_info_rec_size(struct bpf_prog_info *info) |
2228 | { | |
2229 | /* | |
2230 | * Ensure info.*_rec_size is the same as kernel expected size | |
2231 | * | |
2232 | * or | |
2233 | * | |
2234 | * Only allow zero *_rec_size if both _rec_size and _cnt are | |
2235 | * zero. In this case, the kernel will set the expected | |
2236 | * _rec_size back to the info. | |
2237 | */ | |
2238 | ||
11d8b82d | 2239 | if ((info->nr_func_info || info->func_info_rec_size) && |
c454a46b MKL |
2240 | info->func_info_rec_size != sizeof(struct bpf_func_info)) |
2241 | return -EINVAL; | |
2242 | ||
11d8b82d | 2243 | if ((info->nr_line_info || info->line_info_rec_size) && |
c454a46b MKL |
2244 | info->line_info_rec_size != sizeof(struct bpf_line_info)) |
2245 | return -EINVAL; | |
2246 | ||
11d8b82d | 2247 | if ((info->nr_jited_line_info || info->jited_line_info_rec_size) && |
c454a46b MKL |
2248 | info->jited_line_info_rec_size != sizeof(__u64)) |
2249 | return -EINVAL; | |
2250 | ||
2251 | info->func_info_rec_size = sizeof(struct bpf_func_info); | |
2252 | info->line_info_rec_size = sizeof(struct bpf_line_info); | |
2253 | info->jited_line_info_rec_size = sizeof(__u64); | |
2254 | ||
2255 | return 0; | |
2256 | } | |
2257 | ||
1e270976 MKL |
2258 | static int bpf_prog_get_info_by_fd(struct bpf_prog *prog, |
2259 | const union bpf_attr *attr, | |
2260 | union bpf_attr __user *uattr) | |
2261 | { | |
2262 | struct bpf_prog_info __user *uinfo = u64_to_user_ptr(attr->info.info); | |
2263 | struct bpf_prog_info info = {}; | |
2264 | u32 info_len = attr->info.info_len; | |
5f8f8b93 | 2265 | struct bpf_prog_stats stats; |
1e270976 MKL |
2266 | char __user *uinsns; |
2267 | u32 ulen; | |
2268 | int err; | |
2269 | ||
dcab51f1 | 2270 | err = bpf_check_uarg_tail_zero(uinfo, sizeof(info), info_len); |
1e270976 MKL |
2271 | if (err) |
2272 | return err; | |
2273 | info_len = min_t(u32, sizeof(info), info_len); | |
2274 | ||
2275 | if (copy_from_user(&info, uinfo, info_len)) | |
89b09689 | 2276 | return -EFAULT; |
1e270976 MKL |
2277 | |
2278 | info.type = prog->type; | |
2279 | info.id = prog->aux->id; | |
cb4d2b3f MKL |
2280 | info.load_time = prog->aux->load_time; |
2281 | info.created_by_uid = from_kuid_munged(current_user_ns(), | |
2282 | prog->aux->user->uid); | |
b85fab0e | 2283 | info.gpl_compatible = prog->gpl_compatible; |
1e270976 MKL |
2284 | |
2285 | memcpy(info.tag, prog->tag, sizeof(prog->tag)); | |
cb4d2b3f MKL |
2286 | memcpy(info.name, prog->aux->name, sizeof(prog->aux->name)); |
2287 | ||
2288 | ulen = info.nr_map_ids; | |
2289 | info.nr_map_ids = prog->aux->used_map_cnt; | |
2290 | ulen = min_t(u32, info.nr_map_ids, ulen); | |
2291 | if (ulen) { | |
721e08da | 2292 | u32 __user *user_map_ids = u64_to_user_ptr(info.map_ids); |
cb4d2b3f MKL |
2293 | u32 i; |
2294 | ||
2295 | for (i = 0; i < ulen; i++) | |
2296 | if (put_user(prog->aux->used_maps[i]->id, | |
2297 | &user_map_ids[i])) | |
2298 | return -EFAULT; | |
2299 | } | |
1e270976 | 2300 | |
c454a46b MKL |
2301 | err = set_info_rec_size(&info); |
2302 | if (err) | |
2303 | return err; | |
7337224f | 2304 | |
5f8f8b93 AS |
2305 | bpf_prog_get_stats(prog, &stats); |
2306 | info.run_time_ns = stats.nsecs; | |
2307 | info.run_cnt = stats.cnt; | |
2308 | ||
1e270976 MKL |
2309 | if (!capable(CAP_SYS_ADMIN)) { |
2310 | info.jited_prog_len = 0; | |
2311 | info.xlated_prog_len = 0; | |
dbecd738 | 2312 | info.nr_jited_ksyms = 0; |
28c2fae7 | 2313 | info.nr_jited_func_lens = 0; |
11d8b82d YS |
2314 | info.nr_func_info = 0; |
2315 | info.nr_line_info = 0; | |
2316 | info.nr_jited_line_info = 0; | |
1e270976 MKL |
2317 | goto done; |
2318 | } | |
2319 | ||
1e270976 | 2320 | ulen = info.xlated_prog_len; |
9975a54b | 2321 | info.xlated_prog_len = bpf_prog_insn_size(prog); |
1e270976 | 2322 | if (info.xlated_prog_len && ulen) { |
7105e828 DB |
2323 | struct bpf_insn *insns_sanitized; |
2324 | bool fault; | |
2325 | ||
2326 | if (prog->blinded && !bpf_dump_raw_ok()) { | |
2327 | info.xlated_prog_insns = 0; | |
2328 | goto done; | |
2329 | } | |
2330 | insns_sanitized = bpf_insn_prepare_dump(prog); | |
2331 | if (!insns_sanitized) | |
2332 | return -ENOMEM; | |
1e270976 MKL |
2333 | uinsns = u64_to_user_ptr(info.xlated_prog_insns); |
2334 | ulen = min_t(u32, info.xlated_prog_len, ulen); | |
7105e828 DB |
2335 | fault = copy_to_user(uinsns, insns_sanitized, ulen); |
2336 | kfree(insns_sanitized); | |
2337 | if (fault) | |
1e270976 MKL |
2338 | return -EFAULT; |
2339 | } | |
2340 | ||
675fc275 JK |
2341 | if (bpf_prog_is_dev_bound(prog->aux)) { |
2342 | err = bpf_prog_offload_info_fill(&info, prog); | |
2343 | if (err) | |
2344 | return err; | |
fcfb126d JW |
2345 | goto done; |
2346 | } | |
2347 | ||
2348 | /* NOTE: the following code is supposed to be skipped for offload. | |
2349 | * bpf_prog_offload_info_fill() is the place to fill similar fields | |
2350 | * for offload. | |
2351 | */ | |
2352 | ulen = info.jited_prog_len; | |
4d56a76e SD |
2353 | if (prog->aux->func_cnt) { |
2354 | u32 i; | |
2355 | ||
2356 | info.jited_prog_len = 0; | |
2357 | for (i = 0; i < prog->aux->func_cnt; i++) | |
2358 | info.jited_prog_len += prog->aux->func[i]->jited_len; | |
2359 | } else { | |
2360 | info.jited_prog_len = prog->jited_len; | |
2361 | } | |
2362 | ||
fcfb126d JW |
2363 | if (info.jited_prog_len && ulen) { |
2364 | if (bpf_dump_raw_ok()) { | |
2365 | uinsns = u64_to_user_ptr(info.jited_prog_insns); | |
2366 | ulen = min_t(u32, info.jited_prog_len, ulen); | |
4d56a76e SD |
2367 | |
2368 | /* for multi-function programs, copy the JITed | |
2369 | * instructions for all the functions | |
2370 | */ | |
2371 | if (prog->aux->func_cnt) { | |
2372 | u32 len, free, i; | |
2373 | u8 *img; | |
2374 | ||
2375 | free = ulen; | |
2376 | for (i = 0; i < prog->aux->func_cnt; i++) { | |
2377 | len = prog->aux->func[i]->jited_len; | |
2378 | len = min_t(u32, len, free); | |
2379 | img = (u8 *) prog->aux->func[i]->bpf_func; | |
2380 | if (copy_to_user(uinsns, img, len)) | |
2381 | return -EFAULT; | |
2382 | uinsns += len; | |
2383 | free -= len; | |
2384 | if (!free) | |
2385 | break; | |
2386 | } | |
2387 | } else { | |
2388 | if (copy_to_user(uinsns, prog->bpf_func, ulen)) | |
2389 | return -EFAULT; | |
2390 | } | |
fcfb126d JW |
2391 | } else { |
2392 | info.jited_prog_insns = 0; | |
2393 | } | |
675fc275 JK |
2394 | } |
2395 | ||
dbecd738 | 2396 | ulen = info.nr_jited_ksyms; |
ff1889fc | 2397 | info.nr_jited_ksyms = prog->aux->func_cnt ? : 1; |
7a5725dd | 2398 | if (ulen) { |
dbecd738 | 2399 | if (bpf_dump_raw_ok()) { |
ff1889fc | 2400 | unsigned long ksym_addr; |
dbecd738 | 2401 | u64 __user *user_ksyms; |
dbecd738 SD |
2402 | u32 i; |
2403 | ||
2404 | /* copy the address of the kernel symbol | |
2405 | * corresponding to each function | |
2406 | */ | |
2407 | ulen = min_t(u32, info.nr_jited_ksyms, ulen); | |
2408 | user_ksyms = u64_to_user_ptr(info.jited_ksyms); | |
ff1889fc SL |
2409 | if (prog->aux->func_cnt) { |
2410 | for (i = 0; i < ulen; i++) { | |
2411 | ksym_addr = (unsigned long) | |
2412 | prog->aux->func[i]->bpf_func; | |
2413 | if (put_user((u64) ksym_addr, | |
2414 | &user_ksyms[i])) | |
2415 | return -EFAULT; | |
2416 | } | |
2417 | } else { | |
2418 | ksym_addr = (unsigned long) prog->bpf_func; | |
2419 | if (put_user((u64) ksym_addr, &user_ksyms[0])) | |
dbecd738 SD |
2420 | return -EFAULT; |
2421 | } | |
2422 | } else { | |
2423 | info.jited_ksyms = 0; | |
2424 | } | |
2425 | } | |
2426 | ||
815581c1 | 2427 | ulen = info.nr_jited_func_lens; |
ff1889fc | 2428 | info.nr_jited_func_lens = prog->aux->func_cnt ? : 1; |
7a5725dd | 2429 | if (ulen) { |
815581c1 SD |
2430 | if (bpf_dump_raw_ok()) { |
2431 | u32 __user *user_lens; | |
2432 | u32 func_len, i; | |
2433 | ||
2434 | /* copy the JITed image lengths for each function */ | |
2435 | ulen = min_t(u32, info.nr_jited_func_lens, ulen); | |
2436 | user_lens = u64_to_user_ptr(info.jited_func_lens); | |
ff1889fc SL |
2437 | if (prog->aux->func_cnt) { |
2438 | for (i = 0; i < ulen; i++) { | |
2439 | func_len = | |
2440 | prog->aux->func[i]->jited_len; | |
2441 | if (put_user(func_len, &user_lens[i])) | |
2442 | return -EFAULT; | |
2443 | } | |
2444 | } else { | |
2445 | func_len = prog->jited_len; | |
2446 | if (put_user(func_len, &user_lens[0])) | |
815581c1 SD |
2447 | return -EFAULT; |
2448 | } | |
2449 | } else { | |
2450 | info.jited_func_lens = 0; | |
2451 | } | |
2452 | } | |
2453 | ||
7337224f | 2454 | if (prog->aux->btf) |
838e9690 YS |
2455 | info.btf_id = btf_id(prog->aux->btf); |
2456 | ||
11d8b82d YS |
2457 | ulen = info.nr_func_info; |
2458 | info.nr_func_info = prog->aux->func_info_cnt; | |
2459 | if (info.nr_func_info && ulen) { | |
9e794163 | 2460 | char __user *user_finfo; |
7337224f | 2461 | |
9e794163 MKL |
2462 | user_finfo = u64_to_user_ptr(info.func_info); |
2463 | ulen = min_t(u32, info.nr_func_info, ulen); | |
2464 | if (copy_to_user(user_finfo, prog->aux->func_info, | |
2465 | info.func_info_rec_size * ulen)) | |
2466 | return -EFAULT; | |
838e9690 YS |
2467 | } |
2468 | ||
11d8b82d YS |
2469 | ulen = info.nr_line_info; |
2470 | info.nr_line_info = prog->aux->nr_linfo; | |
2471 | if (info.nr_line_info && ulen) { | |
9e794163 | 2472 | __u8 __user *user_linfo; |
c454a46b | 2473 | |
9e794163 MKL |
2474 | user_linfo = u64_to_user_ptr(info.line_info); |
2475 | ulen = min_t(u32, info.nr_line_info, ulen); | |
2476 | if (copy_to_user(user_linfo, prog->aux->linfo, | |
2477 | info.line_info_rec_size * ulen)) | |
2478 | return -EFAULT; | |
c454a46b MKL |
2479 | } |
2480 | ||
11d8b82d | 2481 | ulen = info.nr_jited_line_info; |
c454a46b | 2482 | if (prog->aux->jited_linfo) |
11d8b82d | 2483 | info.nr_jited_line_info = prog->aux->nr_linfo; |
c454a46b | 2484 | else |
11d8b82d YS |
2485 | info.nr_jited_line_info = 0; |
2486 | if (info.nr_jited_line_info && ulen) { | |
c454a46b MKL |
2487 | if (bpf_dump_raw_ok()) { |
2488 | __u64 __user *user_linfo; | |
2489 | u32 i; | |
2490 | ||
2491 | user_linfo = u64_to_user_ptr(info.jited_line_info); | |
11d8b82d | 2492 | ulen = min_t(u32, info.nr_jited_line_info, ulen); |
c454a46b MKL |
2493 | for (i = 0; i < ulen; i++) { |
2494 | if (put_user((__u64)(long)prog->aux->jited_linfo[i], | |
2495 | &user_linfo[i])) | |
2496 | return -EFAULT; | |
2497 | } | |
2498 | } else { | |
2499 | info.jited_line_info = 0; | |
2500 | } | |
2501 | } | |
2502 | ||
c872bdb3 SL |
2503 | ulen = info.nr_prog_tags; |
2504 | info.nr_prog_tags = prog->aux->func_cnt ? : 1; | |
2505 | if (ulen) { | |
2506 | __u8 __user (*user_prog_tags)[BPF_TAG_SIZE]; | |
2507 | u32 i; | |
2508 | ||
2509 | user_prog_tags = u64_to_user_ptr(info.prog_tags); | |
2510 | ulen = min_t(u32, info.nr_prog_tags, ulen); | |
2511 | if (prog->aux->func_cnt) { | |
2512 | for (i = 0; i < ulen; i++) { | |
2513 | if (copy_to_user(user_prog_tags[i], | |
2514 | prog->aux->func[i]->tag, | |
2515 | BPF_TAG_SIZE)) | |
2516 | return -EFAULT; | |
2517 | } | |
2518 | } else { | |
2519 | if (copy_to_user(user_prog_tags[0], | |
2520 | prog->tag, BPF_TAG_SIZE)) | |
2521 | return -EFAULT; | |
2522 | } | |
2523 | } | |
2524 | ||
1e270976 MKL |
2525 | done: |
2526 | if (copy_to_user(uinfo, &info, info_len) || | |
2527 | put_user(info_len, &uattr->info.info_len)) | |
2528 | return -EFAULT; | |
2529 | ||
2530 | return 0; | |
2531 | } | |
2532 | ||
2533 | static int bpf_map_get_info_by_fd(struct bpf_map *map, | |
2534 | const union bpf_attr *attr, | |
2535 | union bpf_attr __user *uattr) | |
2536 | { | |
2537 | struct bpf_map_info __user *uinfo = u64_to_user_ptr(attr->info.info); | |
2538 | struct bpf_map_info info = {}; | |
2539 | u32 info_len = attr->info.info_len; | |
2540 | int err; | |
2541 | ||
dcab51f1 | 2542 | err = bpf_check_uarg_tail_zero(uinfo, sizeof(info), info_len); |
1e270976 MKL |
2543 | if (err) |
2544 | return err; | |
2545 | info_len = min_t(u32, sizeof(info), info_len); | |
2546 | ||
2547 | info.type = map->map_type; | |
2548 | info.id = map->id; | |
2549 | info.key_size = map->key_size; | |
2550 | info.value_size = map->value_size; | |
2551 | info.max_entries = map->max_entries; | |
2552 | info.map_flags = map->map_flags; | |
ad5b177b | 2553 | memcpy(info.name, map->name, sizeof(map->name)); |
1e270976 | 2554 | |
78958fca MKL |
2555 | if (map->btf) { |
2556 | info.btf_id = btf_id(map->btf); | |
9b2cf328 MKL |
2557 | info.btf_key_type_id = map->btf_key_type_id; |
2558 | info.btf_value_type_id = map->btf_value_type_id; | |
78958fca MKL |
2559 | } |
2560 | ||
52775b33 JK |
2561 | if (bpf_map_is_dev_bound(map)) { |
2562 | err = bpf_map_offload_info_fill(&info, map); | |
2563 | if (err) | |
2564 | return err; | |
2565 | } | |
2566 | ||
1e270976 MKL |
2567 | if (copy_to_user(uinfo, &info, info_len) || |
2568 | put_user(info_len, &uattr->info.info_len)) | |
2569 | return -EFAULT; | |
2570 | ||
2571 | return 0; | |
2572 | } | |
2573 | ||
62dab84c MKL |
2574 | static int bpf_btf_get_info_by_fd(struct btf *btf, |
2575 | const union bpf_attr *attr, | |
2576 | union bpf_attr __user *uattr) | |
2577 | { | |
2578 | struct bpf_btf_info __user *uinfo = u64_to_user_ptr(attr->info.info); | |
2579 | u32 info_len = attr->info.info_len; | |
2580 | int err; | |
2581 | ||
dcab51f1 | 2582 | err = bpf_check_uarg_tail_zero(uinfo, sizeof(*uinfo), info_len); |
62dab84c MKL |
2583 | if (err) |
2584 | return err; | |
2585 | ||
2586 | return btf_get_info_by_fd(btf, attr, uattr); | |
2587 | } | |
2588 | ||
1e270976 MKL |
2589 | #define BPF_OBJ_GET_INFO_BY_FD_LAST_FIELD info.info |
2590 | ||
2591 | static int bpf_obj_get_info_by_fd(const union bpf_attr *attr, | |
2592 | union bpf_attr __user *uattr) | |
2593 | { | |
2594 | int ufd = attr->info.bpf_fd; | |
2595 | struct fd f; | |
2596 | int err; | |
2597 | ||
2598 | if (CHECK_ATTR(BPF_OBJ_GET_INFO_BY_FD)) | |
2599 | return -EINVAL; | |
2600 | ||
2601 | f = fdget(ufd); | |
2602 | if (!f.file) | |
2603 | return -EBADFD; | |
2604 | ||
2605 | if (f.file->f_op == &bpf_prog_fops) | |
2606 | err = bpf_prog_get_info_by_fd(f.file->private_data, attr, | |
2607 | uattr); | |
2608 | else if (f.file->f_op == &bpf_map_fops) | |
2609 | err = bpf_map_get_info_by_fd(f.file->private_data, attr, | |
2610 | uattr); | |
60197cfb | 2611 | else if (f.file->f_op == &btf_fops) |
62dab84c | 2612 | err = bpf_btf_get_info_by_fd(f.file->private_data, attr, uattr); |
1e270976 MKL |
2613 | else |
2614 | err = -EINVAL; | |
2615 | ||
2616 | fdput(f); | |
2617 | return err; | |
2618 | } | |
2619 | ||
f56a653c MKL |
2620 | #define BPF_BTF_LOAD_LAST_FIELD btf_log_level |
2621 | ||
2622 | static int bpf_btf_load(const union bpf_attr *attr) | |
2623 | { | |
2624 | if (CHECK_ATTR(BPF_BTF_LOAD)) | |
2625 | return -EINVAL; | |
2626 | ||
2627 | if (!capable(CAP_SYS_ADMIN)) | |
2628 | return -EPERM; | |
2629 | ||
2630 | return btf_new_fd(attr); | |
2631 | } | |
2632 | ||
78958fca MKL |
2633 | #define BPF_BTF_GET_FD_BY_ID_LAST_FIELD btf_id |
2634 | ||
2635 | static int bpf_btf_get_fd_by_id(const union bpf_attr *attr) | |
2636 | { | |
2637 | if (CHECK_ATTR(BPF_BTF_GET_FD_BY_ID)) | |
2638 | return -EINVAL; | |
2639 | ||
2640 | if (!capable(CAP_SYS_ADMIN)) | |
2641 | return -EPERM; | |
2642 | ||
2643 | return btf_get_fd_by_id(attr->btf_id); | |
2644 | } | |
2645 | ||
41bdc4b4 YS |
2646 | static int bpf_task_fd_query_copy(const union bpf_attr *attr, |
2647 | union bpf_attr __user *uattr, | |
2648 | u32 prog_id, u32 fd_type, | |
2649 | const char *buf, u64 probe_offset, | |
2650 | u64 probe_addr) | |
2651 | { | |
2652 | char __user *ubuf = u64_to_user_ptr(attr->task_fd_query.buf); | |
2653 | u32 len = buf ? strlen(buf) : 0, input_len; | |
2654 | int err = 0; | |
2655 | ||
2656 | if (put_user(len, &uattr->task_fd_query.buf_len)) | |
2657 | return -EFAULT; | |
2658 | input_len = attr->task_fd_query.buf_len; | |
2659 | if (input_len && ubuf) { | |
2660 | if (!len) { | |
2661 | /* nothing to copy, just make ubuf NULL terminated */ | |
2662 | char zero = '\0'; | |
2663 | ||
2664 | if (put_user(zero, ubuf)) | |
2665 | return -EFAULT; | |
2666 | } else if (input_len >= len + 1) { | |
2667 | /* ubuf can hold the string with NULL terminator */ | |
2668 | if (copy_to_user(ubuf, buf, len + 1)) | |
2669 | return -EFAULT; | |
2670 | } else { | |
2671 | /* ubuf cannot hold the string with NULL terminator, | |
2672 | * do a partial copy with NULL terminator. | |
2673 | */ | |
2674 | char zero = '\0'; | |
2675 | ||
2676 | err = -ENOSPC; | |
2677 | if (copy_to_user(ubuf, buf, input_len - 1)) | |
2678 | return -EFAULT; | |
2679 | if (put_user(zero, ubuf + input_len - 1)) | |
2680 | return -EFAULT; | |
2681 | } | |
2682 | } | |
2683 | ||
2684 | if (put_user(prog_id, &uattr->task_fd_query.prog_id) || | |
2685 | put_user(fd_type, &uattr->task_fd_query.fd_type) || | |
2686 | put_user(probe_offset, &uattr->task_fd_query.probe_offset) || | |
2687 | put_user(probe_addr, &uattr->task_fd_query.probe_addr)) | |
2688 | return -EFAULT; | |
2689 | ||
2690 | return err; | |
2691 | } | |
2692 | ||
2693 | #define BPF_TASK_FD_QUERY_LAST_FIELD task_fd_query.probe_addr | |
2694 | ||
2695 | static int bpf_task_fd_query(const union bpf_attr *attr, | |
2696 | union bpf_attr __user *uattr) | |
2697 | { | |
2698 | pid_t pid = attr->task_fd_query.pid; | |
2699 | u32 fd = attr->task_fd_query.fd; | |
2700 | const struct perf_event *event; | |
2701 | struct files_struct *files; | |
2702 | struct task_struct *task; | |
2703 | struct file *file; | |
2704 | int err; | |
2705 | ||
2706 | if (CHECK_ATTR(BPF_TASK_FD_QUERY)) | |
2707 | return -EINVAL; | |
2708 | ||
2709 | if (!capable(CAP_SYS_ADMIN)) | |
2710 | return -EPERM; | |
2711 | ||
2712 | if (attr->task_fd_query.flags != 0) | |
2713 | return -EINVAL; | |
2714 | ||
2715 | task = get_pid_task(find_vpid(pid), PIDTYPE_PID); | |
2716 | if (!task) | |
2717 | return -ENOENT; | |
2718 | ||
2719 | files = get_files_struct(task); | |
2720 | put_task_struct(task); | |
2721 | if (!files) | |
2722 | return -ENOENT; | |
2723 | ||
2724 | err = 0; | |
2725 | spin_lock(&files->file_lock); | |
2726 | file = fcheck_files(files, fd); | |
2727 | if (!file) | |
2728 | err = -EBADF; | |
2729 | else | |
2730 | get_file(file); | |
2731 | spin_unlock(&files->file_lock); | |
2732 | put_files_struct(files); | |
2733 | ||
2734 | if (err) | |
2735 | goto out; | |
2736 | ||
2737 | if (file->f_op == &bpf_raw_tp_fops) { | |
2738 | struct bpf_raw_tracepoint *raw_tp = file->private_data; | |
2739 | struct bpf_raw_event_map *btp = raw_tp->btp; | |
2740 | ||
2741 | err = bpf_task_fd_query_copy(attr, uattr, | |
2742 | raw_tp->prog->aux->id, | |
2743 | BPF_FD_TYPE_RAW_TRACEPOINT, | |
2744 | btp->tp->name, 0, 0); | |
2745 | goto put_file; | |
2746 | } | |
2747 | ||
2748 | event = perf_get_event(file); | |
2749 | if (!IS_ERR(event)) { | |
2750 | u64 probe_offset, probe_addr; | |
2751 | u32 prog_id, fd_type; | |
2752 | const char *buf; | |
2753 | ||
2754 | err = bpf_get_perf_event_info(event, &prog_id, &fd_type, | |
2755 | &buf, &probe_offset, | |
2756 | &probe_addr); | |
2757 | if (!err) | |
2758 | err = bpf_task_fd_query_copy(attr, uattr, prog_id, | |
2759 | fd_type, buf, | |
2760 | probe_offset, | |
2761 | probe_addr); | |
2762 | goto put_file; | |
2763 | } | |
2764 | ||
2765 | err = -ENOTSUPP; | |
2766 | put_file: | |
2767 | fput(file); | |
2768 | out: | |
2769 | return err; | |
2770 | } | |
2771 | ||
99c55f7d AS |
2772 | SYSCALL_DEFINE3(bpf, int, cmd, union bpf_attr __user *, uattr, unsigned int, size) |
2773 | { | |
2774 | union bpf_attr attr = {}; | |
2775 | int err; | |
2776 | ||
0fa4fe85 | 2777 | if (sysctl_unprivileged_bpf_disabled && !capable(CAP_SYS_ADMIN)) |
99c55f7d AS |
2778 | return -EPERM; |
2779 | ||
dcab51f1 | 2780 | err = bpf_check_uarg_tail_zero(uattr, sizeof(attr), size); |
1e270976 MKL |
2781 | if (err) |
2782 | return err; | |
2783 | size = min_t(u32, size, sizeof(attr)); | |
99c55f7d AS |
2784 | |
2785 | /* copy attributes from user space, may be less than sizeof(bpf_attr) */ | |
2786 | if (copy_from_user(&attr, uattr, size) != 0) | |
2787 | return -EFAULT; | |
2788 | ||
afdb09c7 CF |
2789 | err = security_bpf(cmd, &attr, size); |
2790 | if (err < 0) | |
2791 | return err; | |
2792 | ||
99c55f7d AS |
2793 | switch (cmd) { |
2794 | case BPF_MAP_CREATE: | |
2795 | err = map_create(&attr); | |
2796 | break; | |
db20fd2b AS |
2797 | case BPF_MAP_LOOKUP_ELEM: |
2798 | err = map_lookup_elem(&attr); | |
2799 | break; | |
2800 | case BPF_MAP_UPDATE_ELEM: | |
2801 | err = map_update_elem(&attr); | |
2802 | break; | |
2803 | case BPF_MAP_DELETE_ELEM: | |
2804 | err = map_delete_elem(&attr); | |
2805 | break; | |
2806 | case BPF_MAP_GET_NEXT_KEY: | |
2807 | err = map_get_next_key(&attr); | |
2808 | break; | |
87df15de DB |
2809 | case BPF_MAP_FREEZE: |
2810 | err = map_freeze(&attr); | |
2811 | break; | |
09756af4 | 2812 | case BPF_PROG_LOAD: |
838e9690 | 2813 | err = bpf_prog_load(&attr, uattr); |
09756af4 | 2814 | break; |
b2197755 DB |
2815 | case BPF_OBJ_PIN: |
2816 | err = bpf_obj_pin(&attr); | |
2817 | break; | |
2818 | case BPF_OBJ_GET: | |
2819 | err = bpf_obj_get(&attr); | |
2820 | break; | |
f4324551 DM |
2821 | case BPF_PROG_ATTACH: |
2822 | err = bpf_prog_attach(&attr); | |
2823 | break; | |
2824 | case BPF_PROG_DETACH: | |
2825 | err = bpf_prog_detach(&attr); | |
2826 | break; | |
468e2f64 AS |
2827 | case BPF_PROG_QUERY: |
2828 | err = bpf_prog_query(&attr, uattr); | |
2829 | break; | |
1cf1cae9 AS |
2830 | case BPF_PROG_TEST_RUN: |
2831 | err = bpf_prog_test_run(&attr, uattr); | |
2832 | break; | |
34ad5580 MKL |
2833 | case BPF_PROG_GET_NEXT_ID: |
2834 | err = bpf_obj_get_next_id(&attr, uattr, | |
2835 | &prog_idr, &prog_idr_lock); | |
2836 | break; | |
2837 | case BPF_MAP_GET_NEXT_ID: | |
2838 | err = bpf_obj_get_next_id(&attr, uattr, | |
2839 | &map_idr, &map_idr_lock); | |
2840 | break; | |
b16d9aa4 MKL |
2841 | case BPF_PROG_GET_FD_BY_ID: |
2842 | err = bpf_prog_get_fd_by_id(&attr); | |
2843 | break; | |
bd5f5f4e MKL |
2844 | case BPF_MAP_GET_FD_BY_ID: |
2845 | err = bpf_map_get_fd_by_id(&attr); | |
2846 | break; | |
1e270976 MKL |
2847 | case BPF_OBJ_GET_INFO_BY_FD: |
2848 | err = bpf_obj_get_info_by_fd(&attr, uattr); | |
2849 | break; | |
c4f6699d AS |
2850 | case BPF_RAW_TRACEPOINT_OPEN: |
2851 | err = bpf_raw_tracepoint_open(&attr); | |
2852 | break; | |
f56a653c MKL |
2853 | case BPF_BTF_LOAD: |
2854 | err = bpf_btf_load(&attr); | |
2855 | break; | |
78958fca MKL |
2856 | case BPF_BTF_GET_FD_BY_ID: |
2857 | err = bpf_btf_get_fd_by_id(&attr); | |
2858 | break; | |
41bdc4b4 YS |
2859 | case BPF_TASK_FD_QUERY: |
2860 | err = bpf_task_fd_query(&attr, uattr); | |
2861 | break; | |
bd513cd0 MV |
2862 | case BPF_MAP_LOOKUP_AND_DELETE_ELEM: |
2863 | err = map_lookup_and_delete_elem(&attr); | |
2864 | break; | |
99c55f7d AS |
2865 | default: |
2866 | err = -EINVAL; | |
2867 | break; | |
2868 | } | |
2869 | ||
2870 | return err; | |
2871 | } |