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