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5b497af4 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
99c55f7d | 2 | /* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com |
99c55f7d AS |
3 | */ |
4 | #include <linux/bpf.h> | |
a67edbf4 | 5 | #include <linux/bpf_trace.h> |
f4364dcf | 6 | #include <linux/bpf_lirc.h> |
f56a653c | 7 | #include <linux/btf.h> |
99c55f7d AS |
8 | #include <linux/syscalls.h> |
9 | #include <linux/slab.h> | |
3f07c014 | 10 | #include <linux/sched/signal.h> |
d407bd25 DB |
11 | #include <linux/vmalloc.h> |
12 | #include <linux/mmzone.h> | |
99c55f7d | 13 | #include <linux/anon_inodes.h> |
41bdc4b4 | 14 | #include <linux/fdtable.h> |
db20fd2b | 15 | #include <linux/file.h> |
41bdc4b4 | 16 | #include <linux/fs.h> |
09756af4 AS |
17 | #include <linux/license.h> |
18 | #include <linux/filter.h> | |
2541517c | 19 | #include <linux/version.h> |
535e7b4b | 20 | #include <linux/kernel.h> |
dc4bb0e2 | 21 | #include <linux/idr.h> |
cb4d2b3f MKL |
22 | #include <linux/cred.h> |
23 | #include <linux/timekeeping.h> | |
24 | #include <linux/ctype.h> | |
9ef09e35 | 25 | #include <linux/nospec.h> |
bae141f5 | 26 | #include <linux/audit.h> |
ccfe29eb | 27 | #include <uapi/linux/btf.h> |
99c55f7d | 28 | |
da765a2f DB |
29 | #define IS_FD_ARRAY(map) ((map)->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY || \ |
30 | (map)->map_type == BPF_MAP_TYPE_CGROUP_ARRAY || \ | |
31 | (map)->map_type == BPF_MAP_TYPE_ARRAY_OF_MAPS) | |
32 | #define IS_FD_PROG_ARRAY(map) ((map)->map_type == BPF_MAP_TYPE_PROG_ARRAY) | |
14dc6f04 | 33 | #define IS_FD_HASH(map) ((map)->map_type == BPF_MAP_TYPE_HASH_OF_MAPS) |
da765a2f DB |
34 | #define IS_FD_MAP(map) (IS_FD_ARRAY(map) || IS_FD_PROG_ARRAY(map) || \ |
35 | IS_FD_HASH(map)) | |
14dc6f04 | 36 | |
6e71b04a CF |
37 | #define BPF_OBJ_FLAG_MASK (BPF_F_RDONLY | BPF_F_WRONLY) |
38 | ||
b121d1e7 | 39 | DEFINE_PER_CPU(int, bpf_prog_active); |
dc4bb0e2 MKL |
40 | static DEFINE_IDR(prog_idr); |
41 | static DEFINE_SPINLOCK(prog_idr_lock); | |
f3f1c054 MKL |
42 | static DEFINE_IDR(map_idr); |
43 | static DEFINE_SPINLOCK(map_idr_lock); | |
b121d1e7 | 44 | |
1be7f75d AS |
45 | int sysctl_unprivileged_bpf_disabled __read_mostly; |
46 | ||
40077e0c | 47 | static const struct bpf_map_ops * const bpf_map_types[] = { |
91cc1a99 | 48 | #define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) |
40077e0c JB |
49 | #define BPF_MAP_TYPE(_id, _ops) \ |
50 | [_id] = &_ops, | |
51 | #include <linux/bpf_types.h> | |
52 | #undef BPF_PROG_TYPE | |
53 | #undef BPF_MAP_TYPE | |
54 | }; | |
99c55f7d | 55 | |
752ba56f MS |
56 | /* |
57 | * If we're handed a bigger struct than we know of, ensure all the unknown bits | |
58 | * are 0 - i.e. new user-space does not rely on any kernel feature extensions | |
59 | * we don't know about yet. | |
60 | * | |
61 | * There is a ToCToU between this function call and the following | |
62 | * copy_from_user() call. However, this is not a concern since this function is | |
63 | * meant to be a future-proofing of bits. | |
64 | */ | |
dcab51f1 MKL |
65 | int bpf_check_uarg_tail_zero(void __user *uaddr, |
66 | size_t expected_size, | |
67 | size_t actual_size) | |
58291a74 MS |
68 | { |
69 | unsigned char __user *addr; | |
70 | unsigned char __user *end; | |
71 | unsigned char val; | |
72 | int err; | |
73 | ||
752ba56f MS |
74 | if (unlikely(actual_size > PAGE_SIZE)) /* silly large */ |
75 | return -E2BIG; | |
76 | ||
96d4f267 | 77 | if (unlikely(!access_ok(uaddr, actual_size))) |
752ba56f MS |
78 | return -EFAULT; |
79 | ||
58291a74 MS |
80 | if (actual_size <= expected_size) |
81 | return 0; | |
82 | ||
83 | addr = uaddr + expected_size; | |
84 | end = uaddr + actual_size; | |
85 | ||
86 | for (; addr < end; addr++) { | |
87 | err = get_user(val, addr); | |
88 | if (err) | |
89 | return err; | |
90 | if (val) | |
91 | return -E2BIG; | |
92 | } | |
93 | ||
94 | return 0; | |
95 | } | |
96 | ||
a3884572 JK |
97 | const struct bpf_map_ops bpf_map_offload_ops = { |
98 | .map_alloc = bpf_map_offload_map_alloc, | |
99 | .map_free = bpf_map_offload_map_free, | |
e8d2bec0 | 100 | .map_check_btf = map_check_no_btf, |
a3884572 JK |
101 | }; |
102 | ||
99c55f7d AS |
103 | static struct bpf_map *find_and_alloc_map(union bpf_attr *attr) |
104 | { | |
1110f3a9 | 105 | const struct bpf_map_ops *ops; |
9ef09e35 | 106 | u32 type = attr->map_type; |
99c55f7d | 107 | struct bpf_map *map; |
1110f3a9 | 108 | int err; |
99c55f7d | 109 | |
9ef09e35 | 110 | if (type >= ARRAY_SIZE(bpf_map_types)) |
1110f3a9 | 111 | return ERR_PTR(-EINVAL); |
9ef09e35 MR |
112 | type = array_index_nospec(type, ARRAY_SIZE(bpf_map_types)); |
113 | ops = bpf_map_types[type]; | |
1110f3a9 | 114 | if (!ops) |
40077e0c | 115 | return ERR_PTR(-EINVAL); |
99c55f7d | 116 | |
1110f3a9 JK |
117 | if (ops->map_alloc_check) { |
118 | err = ops->map_alloc_check(attr); | |
119 | if (err) | |
120 | return ERR_PTR(err); | |
121 | } | |
a3884572 JK |
122 | if (attr->map_ifindex) |
123 | ops = &bpf_map_offload_ops; | |
1110f3a9 | 124 | map = ops->map_alloc(attr); |
40077e0c JB |
125 | if (IS_ERR(map)) |
126 | return map; | |
1110f3a9 | 127 | map->ops = ops; |
9ef09e35 | 128 | map->map_type = type; |
40077e0c | 129 | return map; |
99c55f7d AS |
130 | } |
131 | ||
15c14a3d BV |
132 | static u32 bpf_map_value_size(struct bpf_map *map) |
133 | { | |
134 | if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH || | |
135 | map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH || | |
136 | map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY || | |
137 | map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE) | |
138 | return round_up(map->value_size, 8) * num_possible_cpus(); | |
139 | else if (IS_FD_MAP(map)) | |
140 | return sizeof(u32); | |
141 | else | |
142 | return map->value_size; | |
143 | } | |
144 | ||
145 | static void maybe_wait_bpf_programs(struct bpf_map *map) | |
146 | { | |
147 | /* Wait for any running BPF programs to complete so that | |
148 | * userspace, when we return to it, knows that all programs | |
149 | * that could be running use the new map value. | |
150 | */ | |
151 | if (map->map_type == BPF_MAP_TYPE_HASH_OF_MAPS || | |
152 | map->map_type == BPF_MAP_TYPE_ARRAY_OF_MAPS) | |
153 | synchronize_rcu(); | |
154 | } | |
155 | ||
156 | static int bpf_map_update_value(struct bpf_map *map, struct fd f, void *key, | |
157 | void *value, __u64 flags) | |
158 | { | |
159 | int err; | |
160 | ||
161 | /* Need to create a kthread, thus must support schedule */ | |
162 | if (bpf_map_is_dev_bound(map)) { | |
163 | return bpf_map_offload_update_elem(map, key, value, flags); | |
164 | } else if (map->map_type == BPF_MAP_TYPE_CPUMAP || | |
165 | map->map_type == BPF_MAP_TYPE_SOCKHASH || | |
166 | map->map_type == BPF_MAP_TYPE_SOCKMAP || | |
167 | map->map_type == BPF_MAP_TYPE_STRUCT_OPS) { | |
168 | return map->ops->map_update_elem(map, key, value, flags); | |
169 | } else if (IS_FD_PROG_ARRAY(map)) { | |
170 | return bpf_fd_array_map_update_elem(map, f.file, key, value, | |
171 | flags); | |
172 | } | |
173 | ||
174 | /* must increment bpf_prog_active to avoid kprobe+bpf triggering from | |
175 | * inside bpf map update or delete otherwise deadlocks are possible | |
176 | */ | |
177 | preempt_disable(); | |
178 | __this_cpu_inc(bpf_prog_active); | |
179 | if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH || | |
180 | map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH) { | |
181 | err = bpf_percpu_hash_update(map, key, value, flags); | |
182 | } else if (map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY) { | |
183 | err = bpf_percpu_array_update(map, key, value, flags); | |
184 | } else if (map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE) { | |
185 | err = bpf_percpu_cgroup_storage_update(map, key, value, | |
186 | flags); | |
187 | } else if (IS_FD_ARRAY(map)) { | |
188 | rcu_read_lock(); | |
189 | err = bpf_fd_array_map_update_elem(map, f.file, key, value, | |
190 | flags); | |
191 | rcu_read_unlock(); | |
192 | } else if (map->map_type == BPF_MAP_TYPE_HASH_OF_MAPS) { | |
193 | rcu_read_lock(); | |
194 | err = bpf_fd_htab_map_update_elem(map, f.file, key, value, | |
195 | flags); | |
196 | rcu_read_unlock(); | |
197 | } else if (map->map_type == BPF_MAP_TYPE_REUSEPORT_SOCKARRAY) { | |
198 | /* rcu_read_lock() is not needed */ | |
199 | err = bpf_fd_reuseport_array_update_elem(map, key, value, | |
200 | flags); | |
201 | } else if (map->map_type == BPF_MAP_TYPE_QUEUE || | |
202 | map->map_type == BPF_MAP_TYPE_STACK) { | |
203 | err = map->ops->map_push_elem(map, value, flags); | |
204 | } else { | |
205 | rcu_read_lock(); | |
206 | err = map->ops->map_update_elem(map, key, value, flags); | |
207 | rcu_read_unlock(); | |
208 | } | |
209 | __this_cpu_dec(bpf_prog_active); | |
210 | preempt_enable(); | |
211 | maybe_wait_bpf_programs(map); | |
212 | ||
213 | return err; | |
214 | } | |
215 | ||
216 | static int bpf_map_copy_value(struct bpf_map *map, void *key, void *value, | |
217 | __u64 flags) | |
218 | { | |
219 | void *ptr; | |
220 | int err; | |
221 | ||
cb4d03ab BV |
222 | if (bpf_map_is_dev_bound(map)) |
223 | return bpf_map_offload_lookup_elem(map, key, value); | |
15c14a3d BV |
224 | |
225 | preempt_disable(); | |
226 | this_cpu_inc(bpf_prog_active); | |
227 | if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH || | |
228 | map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH) { | |
229 | err = bpf_percpu_hash_copy(map, key, value); | |
230 | } else if (map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY) { | |
231 | err = bpf_percpu_array_copy(map, key, value); | |
232 | } else if (map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE) { | |
233 | err = bpf_percpu_cgroup_storage_copy(map, key, value); | |
234 | } else if (map->map_type == BPF_MAP_TYPE_STACK_TRACE) { | |
235 | err = bpf_stackmap_copy(map, key, value); | |
236 | } else if (IS_FD_ARRAY(map) || IS_FD_PROG_ARRAY(map)) { | |
237 | err = bpf_fd_array_map_lookup_elem(map, key, value); | |
238 | } else if (IS_FD_HASH(map)) { | |
239 | err = bpf_fd_htab_map_lookup_elem(map, key, value); | |
240 | } else if (map->map_type == BPF_MAP_TYPE_REUSEPORT_SOCKARRAY) { | |
241 | err = bpf_fd_reuseport_array_lookup_elem(map, key, value); | |
242 | } else if (map->map_type == BPF_MAP_TYPE_QUEUE || | |
243 | map->map_type == BPF_MAP_TYPE_STACK) { | |
244 | err = map->ops->map_peek_elem(map, value); | |
245 | } else if (map->map_type == BPF_MAP_TYPE_STRUCT_OPS) { | |
246 | /* struct_ops map requires directly updating "value" */ | |
247 | err = bpf_struct_ops_map_sys_lookup_elem(map, key, value); | |
248 | } else { | |
249 | rcu_read_lock(); | |
250 | if (map->ops->map_lookup_elem_sys_only) | |
251 | ptr = map->ops->map_lookup_elem_sys_only(map, key); | |
252 | else | |
253 | ptr = map->ops->map_lookup_elem(map, key); | |
254 | if (IS_ERR(ptr)) { | |
255 | err = PTR_ERR(ptr); | |
256 | } else if (!ptr) { | |
257 | err = -ENOENT; | |
258 | } else { | |
259 | err = 0; | |
260 | if (flags & BPF_F_LOCK) | |
261 | /* lock 'ptr' and copy everything but lock */ | |
262 | copy_map_value_locked(map, value, ptr, true); | |
263 | else | |
264 | copy_map_value(map, value, ptr); | |
265 | /* mask lock, since value wasn't zero inited */ | |
266 | check_and_init_map_lock(map, value); | |
267 | } | |
268 | rcu_read_unlock(); | |
269 | } | |
270 | ||
271 | this_cpu_dec(bpf_prog_active); | |
272 | preempt_enable(); | |
273 | maybe_wait_bpf_programs(map); | |
274 | ||
275 | return err; | |
276 | } | |
277 | ||
196e8ca7 | 278 | static void *__bpf_map_area_alloc(u64 size, int numa_node, bool mmapable) |
d407bd25 | 279 | { |
f01a7dbe MP |
280 | /* We really just want to fail instead of triggering OOM killer |
281 | * under memory pressure, therefore we set __GFP_NORETRY to kmalloc, | |
282 | * which is used for lower order allocation requests. | |
283 | * | |
284 | * It has been observed that higher order allocation requests done by | |
285 | * vmalloc with __GFP_NORETRY being set might fail due to not trying | |
286 | * to reclaim memory from the page cache, thus we set | |
287 | * __GFP_RETRY_MAYFAIL to avoid such situations. | |
d407bd25 | 288 | */ |
f01a7dbe MP |
289 | |
290 | const gfp_t flags = __GFP_NOWARN | __GFP_ZERO; | |
d407bd25 DB |
291 | void *area; |
292 | ||
196e8ca7 DB |
293 | if (size >= SIZE_MAX) |
294 | return NULL; | |
295 | ||
fc970227 AN |
296 | /* kmalloc()'ed memory can't be mmap()'ed */ |
297 | if (!mmapable && size <= (PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER)) { | |
f01a7dbe MP |
298 | area = kmalloc_node(size, GFP_USER | __GFP_NORETRY | flags, |
299 | numa_node); | |
d407bd25 DB |
300 | if (area != NULL) |
301 | return area; | |
302 | } | |
fc970227 AN |
303 | if (mmapable) { |
304 | BUG_ON(!PAGE_ALIGNED(size)); | |
305 | return vmalloc_user_node_flags(size, numa_node, GFP_KERNEL | | |
306 | __GFP_RETRY_MAYFAIL | flags); | |
307 | } | |
f01a7dbe MP |
308 | return __vmalloc_node_flags_caller(size, numa_node, |
309 | GFP_KERNEL | __GFP_RETRY_MAYFAIL | | |
310 | flags, __builtin_return_address(0)); | |
d407bd25 DB |
311 | } |
312 | ||
196e8ca7 | 313 | void *bpf_map_area_alloc(u64 size, int numa_node) |
fc970227 AN |
314 | { |
315 | return __bpf_map_area_alloc(size, numa_node, false); | |
316 | } | |
317 | ||
196e8ca7 | 318 | void *bpf_map_area_mmapable_alloc(u64 size, int numa_node) |
fc970227 AN |
319 | { |
320 | return __bpf_map_area_alloc(size, numa_node, true); | |
321 | } | |
322 | ||
d407bd25 DB |
323 | void bpf_map_area_free(void *area) |
324 | { | |
325 | kvfree(area); | |
326 | } | |
327 | ||
be70bcd5 DB |
328 | static u32 bpf_map_flags_retain_permanent(u32 flags) |
329 | { | |
330 | /* Some map creation flags are not tied to the map object but | |
331 | * rather to the map fd instead, so they have no meaning upon | |
332 | * map object inspection since multiple file descriptors with | |
333 | * different (access) properties can exist here. Thus, given | |
334 | * this has zero meaning for the map itself, lets clear these | |
335 | * from here. | |
336 | */ | |
337 | return flags & ~(BPF_F_RDONLY | BPF_F_WRONLY); | |
338 | } | |
339 | ||
bd475643 JK |
340 | void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr) |
341 | { | |
342 | map->map_type = attr->map_type; | |
343 | map->key_size = attr->key_size; | |
344 | map->value_size = attr->value_size; | |
345 | map->max_entries = attr->max_entries; | |
be70bcd5 | 346 | map->map_flags = bpf_map_flags_retain_permanent(attr->map_flags); |
bd475643 JK |
347 | map->numa_node = bpf_map_attr_numa_node(attr); |
348 | } | |
349 | ||
0a4c58f5 | 350 | static int bpf_charge_memlock(struct user_struct *user, u32 pages) |
aaac3ba9 | 351 | { |
0a4c58f5 | 352 | unsigned long memlock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; |
aaac3ba9 | 353 | |
0a4c58f5 RG |
354 | if (atomic_long_add_return(pages, &user->locked_vm) > memlock_limit) { |
355 | atomic_long_sub(pages, &user->locked_vm); | |
356 | return -EPERM; | |
357 | } | |
358 | return 0; | |
359 | } | |
aaac3ba9 | 360 | |
0a4c58f5 RG |
361 | static void bpf_uncharge_memlock(struct user_struct *user, u32 pages) |
362 | { | |
b936ca64 RG |
363 | if (user) |
364 | atomic_long_sub(pages, &user->locked_vm); | |
0a4c58f5 | 365 | } |
aaac3ba9 | 366 | |
196e8ca7 | 367 | int bpf_map_charge_init(struct bpf_map_memory *mem, u64 size) |
0a4c58f5 | 368 | { |
c85d6913 RG |
369 | u32 pages = round_up(size, PAGE_SIZE) >> PAGE_SHIFT; |
370 | struct user_struct *user; | |
0a4c58f5 | 371 | int ret; |
aaac3ba9 | 372 | |
c85d6913 RG |
373 | if (size >= U32_MAX - PAGE_SIZE) |
374 | return -E2BIG; | |
375 | ||
376 | user = get_current_user(); | |
b936ca64 | 377 | ret = bpf_charge_memlock(user, pages); |
0a4c58f5 | 378 | if (ret) { |
aaac3ba9 | 379 | free_uid(user); |
0a4c58f5 | 380 | return ret; |
aaac3ba9 | 381 | } |
b936ca64 RG |
382 | |
383 | mem->pages = pages; | |
384 | mem->user = user; | |
385 | ||
386 | return 0; | |
aaac3ba9 AS |
387 | } |
388 | ||
b936ca64 | 389 | void bpf_map_charge_finish(struct bpf_map_memory *mem) |
aaac3ba9 | 390 | { |
b936ca64 RG |
391 | bpf_uncharge_memlock(mem->user, mem->pages); |
392 | free_uid(mem->user); | |
393 | } | |
394 | ||
395 | void bpf_map_charge_move(struct bpf_map_memory *dst, | |
396 | struct bpf_map_memory *src) | |
397 | { | |
398 | *dst = *src; | |
3539b96e | 399 | |
b936ca64 RG |
400 | /* Make sure src will not be used for the redundant uncharging. */ |
401 | memset(src, 0, sizeof(struct bpf_map_memory)); | |
aaac3ba9 AS |
402 | } |
403 | ||
0a4c58f5 RG |
404 | int bpf_map_charge_memlock(struct bpf_map *map, u32 pages) |
405 | { | |
406 | int ret; | |
407 | ||
3539b96e | 408 | ret = bpf_charge_memlock(map->memory.user, pages); |
0a4c58f5 RG |
409 | if (ret) |
410 | return ret; | |
3539b96e | 411 | map->memory.pages += pages; |
0a4c58f5 RG |
412 | return ret; |
413 | } | |
414 | ||
415 | void bpf_map_uncharge_memlock(struct bpf_map *map, u32 pages) | |
416 | { | |
3539b96e RG |
417 | bpf_uncharge_memlock(map->memory.user, pages); |
418 | map->memory.pages -= pages; | |
0a4c58f5 RG |
419 | } |
420 | ||
f3f1c054 MKL |
421 | static int bpf_map_alloc_id(struct bpf_map *map) |
422 | { | |
423 | int id; | |
424 | ||
b76354cd | 425 | idr_preload(GFP_KERNEL); |
f3f1c054 MKL |
426 | spin_lock_bh(&map_idr_lock); |
427 | id = idr_alloc_cyclic(&map_idr, map, 1, INT_MAX, GFP_ATOMIC); | |
428 | if (id > 0) | |
429 | map->id = id; | |
430 | spin_unlock_bh(&map_idr_lock); | |
b76354cd | 431 | idr_preload_end(); |
f3f1c054 MKL |
432 | |
433 | if (WARN_ON_ONCE(!id)) | |
434 | return -ENOSPC; | |
435 | ||
436 | return id > 0 ? 0 : id; | |
437 | } | |
438 | ||
a3884572 | 439 | void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock) |
f3f1c054 | 440 | { |
930651a7 ED |
441 | unsigned long flags; |
442 | ||
a3884572 JK |
443 | /* Offloaded maps are removed from the IDR store when their device |
444 | * disappears - even if someone holds an fd to them they are unusable, | |
445 | * the memory is gone, all ops will fail; they are simply waiting for | |
446 | * refcnt to drop to be freed. | |
447 | */ | |
448 | if (!map->id) | |
449 | return; | |
450 | ||
bd5f5f4e | 451 | if (do_idr_lock) |
930651a7 | 452 | spin_lock_irqsave(&map_idr_lock, flags); |
bd5f5f4e MKL |
453 | else |
454 | __acquire(&map_idr_lock); | |
455 | ||
f3f1c054 | 456 | idr_remove(&map_idr, map->id); |
a3884572 | 457 | map->id = 0; |
bd5f5f4e MKL |
458 | |
459 | if (do_idr_lock) | |
930651a7 | 460 | spin_unlock_irqrestore(&map_idr_lock, flags); |
bd5f5f4e MKL |
461 | else |
462 | __release(&map_idr_lock); | |
f3f1c054 MKL |
463 | } |
464 | ||
99c55f7d AS |
465 | /* called from workqueue */ |
466 | static void bpf_map_free_deferred(struct work_struct *work) | |
467 | { | |
468 | struct bpf_map *map = container_of(work, struct bpf_map, work); | |
b936ca64 | 469 | struct bpf_map_memory mem; |
99c55f7d | 470 | |
b936ca64 | 471 | bpf_map_charge_move(&mem, &map->memory); |
afdb09c7 | 472 | security_bpf_map_free(map); |
99c55f7d AS |
473 | /* implementation dependent freeing */ |
474 | map->ops->map_free(map); | |
b936ca64 | 475 | bpf_map_charge_finish(&mem); |
99c55f7d AS |
476 | } |
477 | ||
c9da161c DB |
478 | static void bpf_map_put_uref(struct bpf_map *map) |
479 | { | |
1e0bd5a0 | 480 | if (atomic64_dec_and_test(&map->usercnt)) { |
ba6b8de4 JF |
481 | if (map->ops->map_release_uref) |
482 | map->ops->map_release_uref(map); | |
c9da161c DB |
483 | } |
484 | } | |
485 | ||
99c55f7d AS |
486 | /* decrement map refcnt and schedule it for freeing via workqueue |
487 | * (unrelying map implementation ops->map_free() might sleep) | |
488 | */ | |
bd5f5f4e | 489 | static void __bpf_map_put(struct bpf_map *map, bool do_idr_lock) |
99c55f7d | 490 | { |
1e0bd5a0 | 491 | if (atomic64_dec_and_test(&map->refcnt)) { |
34ad5580 | 492 | /* bpf_map_free_id() must be called first */ |
bd5f5f4e | 493 | bpf_map_free_id(map, do_idr_lock); |
78958fca | 494 | btf_put(map->btf); |
99c55f7d AS |
495 | INIT_WORK(&map->work, bpf_map_free_deferred); |
496 | schedule_work(&map->work); | |
497 | } | |
498 | } | |
499 | ||
bd5f5f4e MKL |
500 | void bpf_map_put(struct bpf_map *map) |
501 | { | |
502 | __bpf_map_put(map, true); | |
503 | } | |
630a4d38 | 504 | EXPORT_SYMBOL_GPL(bpf_map_put); |
bd5f5f4e | 505 | |
c9da161c | 506 | void bpf_map_put_with_uref(struct bpf_map *map) |
99c55f7d | 507 | { |
c9da161c | 508 | bpf_map_put_uref(map); |
99c55f7d | 509 | bpf_map_put(map); |
c9da161c DB |
510 | } |
511 | ||
512 | static int bpf_map_release(struct inode *inode, struct file *filp) | |
513 | { | |
61d1b6a4 DB |
514 | struct bpf_map *map = filp->private_data; |
515 | ||
516 | if (map->ops->map_release) | |
517 | map->ops->map_release(map, filp); | |
518 | ||
519 | bpf_map_put_with_uref(map); | |
99c55f7d AS |
520 | return 0; |
521 | } | |
522 | ||
87df15de DB |
523 | static fmode_t map_get_sys_perms(struct bpf_map *map, struct fd f) |
524 | { | |
525 | fmode_t mode = f.file->f_mode; | |
526 | ||
527 | /* Our file permissions may have been overridden by global | |
528 | * map permissions facing syscall side. | |
529 | */ | |
530 | if (READ_ONCE(map->frozen)) | |
531 | mode &= ~FMODE_CAN_WRITE; | |
532 | return mode; | |
533 | } | |
534 | ||
f99bf205 DB |
535 | #ifdef CONFIG_PROC_FS |
536 | static void bpf_map_show_fdinfo(struct seq_file *m, struct file *filp) | |
537 | { | |
538 | const struct bpf_map *map = filp->private_data; | |
21116b70 | 539 | const struct bpf_array *array; |
2beee5f5 | 540 | u32 type = 0, jited = 0; |
21116b70 DB |
541 | |
542 | if (map->map_type == BPF_MAP_TYPE_PROG_ARRAY) { | |
543 | array = container_of(map, struct bpf_array, map); | |
2beee5f5 DB |
544 | type = array->aux->type; |
545 | jited = array->aux->jited; | |
21116b70 | 546 | } |
f99bf205 DB |
547 | |
548 | seq_printf(m, | |
549 | "map_type:\t%u\n" | |
550 | "key_size:\t%u\n" | |
551 | "value_size:\t%u\n" | |
322cea2f | 552 | "max_entries:\t%u\n" |
21116b70 | 553 | "map_flags:\t%#x\n" |
4316b409 | 554 | "memlock:\t%llu\n" |
87df15de DB |
555 | "map_id:\t%u\n" |
556 | "frozen:\t%u\n", | |
f99bf205 DB |
557 | map->map_type, |
558 | map->key_size, | |
559 | map->value_size, | |
322cea2f | 560 | map->max_entries, |
21116b70 | 561 | map->map_flags, |
3539b96e | 562 | map->memory.pages * 1ULL << PAGE_SHIFT, |
87df15de DB |
563 | map->id, |
564 | READ_ONCE(map->frozen)); | |
2beee5f5 DB |
565 | if (type) { |
566 | seq_printf(m, "owner_prog_type:\t%u\n", type); | |
567 | seq_printf(m, "owner_jited:\t%u\n", jited); | |
9780c0ab | 568 | } |
f99bf205 DB |
569 | } |
570 | #endif | |
571 | ||
6e71b04a CF |
572 | static ssize_t bpf_dummy_read(struct file *filp, char __user *buf, size_t siz, |
573 | loff_t *ppos) | |
574 | { | |
575 | /* We need this handler such that alloc_file() enables | |
576 | * f_mode with FMODE_CAN_READ. | |
577 | */ | |
578 | return -EINVAL; | |
579 | } | |
580 | ||
581 | static ssize_t bpf_dummy_write(struct file *filp, const char __user *buf, | |
582 | size_t siz, loff_t *ppos) | |
583 | { | |
584 | /* We need this handler such that alloc_file() enables | |
585 | * f_mode with FMODE_CAN_WRITE. | |
586 | */ | |
587 | return -EINVAL; | |
588 | } | |
589 | ||
fc970227 AN |
590 | /* called for any extra memory-mapped regions (except initial) */ |
591 | static void bpf_map_mmap_open(struct vm_area_struct *vma) | |
592 | { | |
593 | struct bpf_map *map = vma->vm_file->private_data; | |
594 | ||
595 | bpf_map_inc_with_uref(map); | |
596 | ||
597 | if (vma->vm_flags & VM_WRITE) { | |
598 | mutex_lock(&map->freeze_mutex); | |
599 | map->writecnt++; | |
600 | mutex_unlock(&map->freeze_mutex); | |
601 | } | |
602 | } | |
603 | ||
604 | /* called for all unmapped memory region (including initial) */ | |
605 | static void bpf_map_mmap_close(struct vm_area_struct *vma) | |
606 | { | |
607 | struct bpf_map *map = vma->vm_file->private_data; | |
608 | ||
609 | if (vma->vm_flags & VM_WRITE) { | |
610 | mutex_lock(&map->freeze_mutex); | |
611 | map->writecnt--; | |
612 | mutex_unlock(&map->freeze_mutex); | |
613 | } | |
614 | ||
615 | bpf_map_put_with_uref(map); | |
616 | } | |
617 | ||
618 | static const struct vm_operations_struct bpf_map_default_vmops = { | |
619 | .open = bpf_map_mmap_open, | |
620 | .close = bpf_map_mmap_close, | |
621 | }; | |
622 | ||
623 | static int bpf_map_mmap(struct file *filp, struct vm_area_struct *vma) | |
624 | { | |
625 | struct bpf_map *map = filp->private_data; | |
626 | int err; | |
627 | ||
628 | if (!map->ops->map_mmap || map_value_has_spin_lock(map)) | |
629 | return -ENOTSUPP; | |
630 | ||
631 | if (!(vma->vm_flags & VM_SHARED)) | |
632 | return -EINVAL; | |
633 | ||
634 | mutex_lock(&map->freeze_mutex); | |
635 | ||
636 | if ((vma->vm_flags & VM_WRITE) && map->frozen) { | |
637 | err = -EPERM; | |
638 | goto out; | |
639 | } | |
640 | ||
641 | /* set default open/close callbacks */ | |
642 | vma->vm_ops = &bpf_map_default_vmops; | |
643 | vma->vm_private_data = map; | |
644 | ||
645 | err = map->ops->map_mmap(map, vma); | |
646 | if (err) | |
647 | goto out; | |
648 | ||
649 | bpf_map_inc_with_uref(map); | |
650 | ||
651 | if (vma->vm_flags & VM_WRITE) | |
652 | map->writecnt++; | |
653 | out: | |
654 | mutex_unlock(&map->freeze_mutex); | |
655 | return err; | |
656 | } | |
657 | ||
f66e448c | 658 | const struct file_operations bpf_map_fops = { |
f99bf205 DB |
659 | #ifdef CONFIG_PROC_FS |
660 | .show_fdinfo = bpf_map_show_fdinfo, | |
661 | #endif | |
662 | .release = bpf_map_release, | |
6e71b04a CF |
663 | .read = bpf_dummy_read, |
664 | .write = bpf_dummy_write, | |
fc970227 | 665 | .mmap = bpf_map_mmap, |
99c55f7d AS |
666 | }; |
667 | ||
6e71b04a | 668 | int bpf_map_new_fd(struct bpf_map *map, int flags) |
aa79781b | 669 | { |
afdb09c7 CF |
670 | int ret; |
671 | ||
672 | ret = security_bpf_map(map, OPEN_FMODE(flags)); | |
673 | if (ret < 0) | |
674 | return ret; | |
675 | ||
aa79781b | 676 | return anon_inode_getfd("bpf-map", &bpf_map_fops, map, |
6e71b04a CF |
677 | flags | O_CLOEXEC); |
678 | } | |
679 | ||
680 | int bpf_get_file_flag(int flags) | |
681 | { | |
682 | if ((flags & BPF_F_RDONLY) && (flags & BPF_F_WRONLY)) | |
683 | return -EINVAL; | |
684 | if (flags & BPF_F_RDONLY) | |
685 | return O_RDONLY; | |
686 | if (flags & BPF_F_WRONLY) | |
687 | return O_WRONLY; | |
688 | return O_RDWR; | |
aa79781b DB |
689 | } |
690 | ||
99c55f7d AS |
691 | /* helper macro to check that unused fields 'union bpf_attr' are zero */ |
692 | #define CHECK_ATTR(CMD) \ | |
693 | memchr_inv((void *) &attr->CMD##_LAST_FIELD + \ | |
694 | sizeof(attr->CMD##_LAST_FIELD), 0, \ | |
695 | sizeof(*attr) - \ | |
696 | offsetof(union bpf_attr, CMD##_LAST_FIELD) - \ | |
697 | sizeof(attr->CMD##_LAST_FIELD)) != NULL | |
698 | ||
cb4d2b3f MKL |
699 | /* dst and src must have at least BPF_OBJ_NAME_LEN number of bytes. |
700 | * Return 0 on success and < 0 on error. | |
701 | */ | |
702 | static int bpf_obj_name_cpy(char *dst, const char *src) | |
703 | { | |
704 | const char *end = src + BPF_OBJ_NAME_LEN; | |
705 | ||
473d9734 | 706 | memset(dst, 0, BPF_OBJ_NAME_LEN); |
3e0ddc4f | 707 | /* Copy all isalnum(), '_' and '.' chars. */ |
cb4d2b3f | 708 | while (src < end && *src) { |
3e0ddc4f DB |
709 | if (!isalnum(*src) && |
710 | *src != '_' && *src != '.') | |
cb4d2b3f MKL |
711 | return -EINVAL; |
712 | *dst++ = *src++; | |
713 | } | |
714 | ||
715 | /* No '\0' found in BPF_OBJ_NAME_LEN number of bytes */ | |
716 | if (src == end) | |
717 | return -EINVAL; | |
718 | ||
cb4d2b3f MKL |
719 | return 0; |
720 | } | |
721 | ||
e8d2bec0 | 722 | int map_check_no_btf(const struct bpf_map *map, |
1b2b234b | 723 | const struct btf *btf, |
e8d2bec0 DB |
724 | const struct btf_type *key_type, |
725 | const struct btf_type *value_type) | |
726 | { | |
727 | return -ENOTSUPP; | |
728 | } | |
729 | ||
d83525ca | 730 | static int map_check_btf(struct bpf_map *map, const struct btf *btf, |
e8d2bec0 DB |
731 | u32 btf_key_id, u32 btf_value_id) |
732 | { | |
733 | const struct btf_type *key_type, *value_type; | |
734 | u32 key_size, value_size; | |
735 | int ret = 0; | |
736 | ||
2824ecb7 DB |
737 | /* Some maps allow key to be unspecified. */ |
738 | if (btf_key_id) { | |
739 | key_type = btf_type_id_size(btf, &btf_key_id, &key_size); | |
740 | if (!key_type || key_size != map->key_size) | |
741 | return -EINVAL; | |
742 | } else { | |
743 | key_type = btf_type_by_id(btf, 0); | |
744 | if (!map->ops->map_check_btf) | |
745 | return -EINVAL; | |
746 | } | |
e8d2bec0 DB |
747 | |
748 | value_type = btf_type_id_size(btf, &btf_value_id, &value_size); | |
749 | if (!value_type || value_size != map->value_size) | |
750 | return -EINVAL; | |
751 | ||
d83525ca AS |
752 | map->spin_lock_off = btf_find_spin_lock(btf, value_type); |
753 | ||
754 | if (map_value_has_spin_lock(map)) { | |
591fe988 DB |
755 | if (map->map_flags & BPF_F_RDONLY_PROG) |
756 | return -EACCES; | |
d83525ca | 757 | if (map->map_type != BPF_MAP_TYPE_HASH && |
e16d2f1a | 758 | map->map_type != BPF_MAP_TYPE_ARRAY && |
6ac99e8f MKL |
759 | map->map_type != BPF_MAP_TYPE_CGROUP_STORAGE && |
760 | map->map_type != BPF_MAP_TYPE_SK_STORAGE) | |
d83525ca AS |
761 | return -ENOTSUPP; |
762 | if (map->spin_lock_off + sizeof(struct bpf_spin_lock) > | |
763 | map->value_size) { | |
764 | WARN_ONCE(1, | |
765 | "verifier bug spin_lock_off %d value_size %d\n", | |
766 | map->spin_lock_off, map->value_size); | |
767 | return -EFAULT; | |
768 | } | |
769 | } | |
770 | ||
e8d2bec0 | 771 | if (map->ops->map_check_btf) |
1b2b234b | 772 | ret = map->ops->map_check_btf(map, btf, key_type, value_type); |
e8d2bec0 DB |
773 | |
774 | return ret; | |
775 | } | |
776 | ||
85d33df3 | 777 | #define BPF_MAP_CREATE_LAST_FIELD btf_vmlinux_value_type_id |
99c55f7d AS |
778 | /* called via syscall */ |
779 | static int map_create(union bpf_attr *attr) | |
780 | { | |
96eabe7a | 781 | int numa_node = bpf_map_attr_numa_node(attr); |
b936ca64 | 782 | struct bpf_map_memory mem; |
99c55f7d | 783 | struct bpf_map *map; |
6e71b04a | 784 | int f_flags; |
99c55f7d AS |
785 | int err; |
786 | ||
787 | err = CHECK_ATTR(BPF_MAP_CREATE); | |
788 | if (err) | |
789 | return -EINVAL; | |
790 | ||
85d33df3 MKL |
791 | if (attr->btf_vmlinux_value_type_id) { |
792 | if (attr->map_type != BPF_MAP_TYPE_STRUCT_OPS || | |
793 | attr->btf_key_type_id || attr->btf_value_type_id) | |
794 | return -EINVAL; | |
795 | } else if (attr->btf_key_type_id && !attr->btf_value_type_id) { | |
796 | return -EINVAL; | |
797 | } | |
798 | ||
6e71b04a CF |
799 | f_flags = bpf_get_file_flag(attr->map_flags); |
800 | if (f_flags < 0) | |
801 | return f_flags; | |
802 | ||
96eabe7a | 803 | if (numa_node != NUMA_NO_NODE && |
96e5ae4e ED |
804 | ((unsigned int)numa_node >= nr_node_ids || |
805 | !node_online(numa_node))) | |
96eabe7a MKL |
806 | return -EINVAL; |
807 | ||
99c55f7d AS |
808 | /* find map type and init map: hashtable vs rbtree vs bloom vs ... */ |
809 | map = find_and_alloc_map(attr); | |
810 | if (IS_ERR(map)) | |
811 | return PTR_ERR(map); | |
812 | ||
ad5b177b MKL |
813 | err = bpf_obj_name_cpy(map->name, attr->map_name); |
814 | if (err) | |
b936ca64 | 815 | goto free_map; |
ad5b177b | 816 | |
1e0bd5a0 AN |
817 | atomic64_set(&map->refcnt, 1); |
818 | atomic64_set(&map->usercnt, 1); | |
fc970227 | 819 | mutex_init(&map->freeze_mutex); |
99c55f7d | 820 | |
85d33df3 MKL |
821 | map->spin_lock_off = -EINVAL; |
822 | if (attr->btf_key_type_id || attr->btf_value_type_id || | |
823 | /* Even the map's value is a kernel's struct, | |
824 | * the bpf_prog.o must have BTF to begin with | |
825 | * to figure out the corresponding kernel's | |
826 | * counter part. Thus, attr->btf_fd has | |
827 | * to be valid also. | |
828 | */ | |
829 | attr->btf_vmlinux_value_type_id) { | |
a26ca7c9 MKL |
830 | struct btf *btf; |
831 | ||
a26ca7c9 MKL |
832 | btf = btf_get_by_fd(attr->btf_fd); |
833 | if (IS_ERR(btf)) { | |
834 | err = PTR_ERR(btf); | |
b936ca64 | 835 | goto free_map; |
a26ca7c9 | 836 | } |
85d33df3 | 837 | map->btf = btf; |
a26ca7c9 | 838 | |
85d33df3 MKL |
839 | if (attr->btf_value_type_id) { |
840 | err = map_check_btf(map, btf, attr->btf_key_type_id, | |
841 | attr->btf_value_type_id); | |
842 | if (err) | |
843 | goto free_map; | |
a26ca7c9 MKL |
844 | } |
845 | ||
9b2cf328 MKL |
846 | map->btf_key_type_id = attr->btf_key_type_id; |
847 | map->btf_value_type_id = attr->btf_value_type_id; | |
85d33df3 MKL |
848 | map->btf_vmlinux_value_type_id = |
849 | attr->btf_vmlinux_value_type_id; | |
a26ca7c9 MKL |
850 | } |
851 | ||
afdb09c7 | 852 | err = security_bpf_map_alloc(map); |
aaac3ba9 | 853 | if (err) |
b936ca64 | 854 | goto free_map; |
afdb09c7 | 855 | |
f3f1c054 MKL |
856 | err = bpf_map_alloc_id(map); |
857 | if (err) | |
b936ca64 | 858 | goto free_map_sec; |
f3f1c054 | 859 | |
6e71b04a | 860 | err = bpf_map_new_fd(map, f_flags); |
bd5f5f4e MKL |
861 | if (err < 0) { |
862 | /* failed to allocate fd. | |
352d20d6 | 863 | * bpf_map_put_with_uref() is needed because the above |
bd5f5f4e MKL |
864 | * bpf_map_alloc_id() has published the map |
865 | * to the userspace and the userspace may | |
866 | * have refcnt-ed it through BPF_MAP_GET_FD_BY_ID. | |
867 | */ | |
352d20d6 | 868 | bpf_map_put_with_uref(map); |
bd5f5f4e MKL |
869 | return err; |
870 | } | |
99c55f7d AS |
871 | |
872 | return err; | |
873 | ||
afdb09c7 CF |
874 | free_map_sec: |
875 | security_bpf_map_free(map); | |
b936ca64 | 876 | free_map: |
a26ca7c9 | 877 | btf_put(map->btf); |
b936ca64 | 878 | bpf_map_charge_move(&mem, &map->memory); |
99c55f7d | 879 | map->ops->map_free(map); |
b936ca64 | 880 | bpf_map_charge_finish(&mem); |
99c55f7d AS |
881 | return err; |
882 | } | |
883 | ||
db20fd2b AS |
884 | /* if error is returned, fd is released. |
885 | * On success caller should complete fd access with matching fdput() | |
886 | */ | |
c2101297 | 887 | struct bpf_map *__bpf_map_get(struct fd f) |
db20fd2b | 888 | { |
db20fd2b AS |
889 | if (!f.file) |
890 | return ERR_PTR(-EBADF); | |
db20fd2b AS |
891 | if (f.file->f_op != &bpf_map_fops) { |
892 | fdput(f); | |
893 | return ERR_PTR(-EINVAL); | |
894 | } | |
895 | ||
c2101297 DB |
896 | return f.file->private_data; |
897 | } | |
898 | ||
1e0bd5a0 | 899 | void bpf_map_inc(struct bpf_map *map) |
c9da161c | 900 | { |
1e0bd5a0 | 901 | atomic64_inc(&map->refcnt); |
c9da161c | 902 | } |
630a4d38 | 903 | EXPORT_SYMBOL_GPL(bpf_map_inc); |
c9da161c | 904 | |
1e0bd5a0 AN |
905 | void bpf_map_inc_with_uref(struct bpf_map *map) |
906 | { | |
907 | atomic64_inc(&map->refcnt); | |
908 | atomic64_inc(&map->usercnt); | |
909 | } | |
910 | EXPORT_SYMBOL_GPL(bpf_map_inc_with_uref); | |
911 | ||
c9da161c | 912 | struct bpf_map *bpf_map_get_with_uref(u32 ufd) |
c2101297 DB |
913 | { |
914 | struct fd f = fdget(ufd); | |
915 | struct bpf_map *map; | |
916 | ||
917 | map = __bpf_map_get(f); | |
918 | if (IS_ERR(map)) | |
919 | return map; | |
920 | ||
1e0bd5a0 | 921 | bpf_map_inc_with_uref(map); |
c2101297 | 922 | fdput(f); |
db20fd2b AS |
923 | |
924 | return map; | |
925 | } | |
926 | ||
bd5f5f4e | 927 | /* map_idr_lock should have been held */ |
1e0bd5a0 | 928 | static struct bpf_map *__bpf_map_inc_not_zero(struct bpf_map *map, bool uref) |
bd5f5f4e MKL |
929 | { |
930 | int refold; | |
931 | ||
1e0bd5a0 | 932 | refold = atomic64_fetch_add_unless(&map->refcnt, 1, 0); |
bd5f5f4e MKL |
933 | if (!refold) |
934 | return ERR_PTR(-ENOENT); | |
bd5f5f4e | 935 | if (uref) |
1e0bd5a0 | 936 | atomic64_inc(&map->usercnt); |
bd5f5f4e MKL |
937 | |
938 | return map; | |
939 | } | |
940 | ||
1e0bd5a0 | 941 | struct bpf_map *bpf_map_inc_not_zero(struct bpf_map *map) |
b0e4701c SF |
942 | { |
943 | spin_lock_bh(&map_idr_lock); | |
1e0bd5a0 | 944 | map = __bpf_map_inc_not_zero(map, false); |
b0e4701c SF |
945 | spin_unlock_bh(&map_idr_lock); |
946 | ||
947 | return map; | |
948 | } | |
949 | EXPORT_SYMBOL_GPL(bpf_map_inc_not_zero); | |
950 | ||
b8cdc051 AS |
951 | int __weak bpf_stackmap_copy(struct bpf_map *map, void *key, void *value) |
952 | { | |
953 | return -ENOTSUPP; | |
954 | } | |
955 | ||
c9d29f46 MV |
956 | static void *__bpf_copy_key(void __user *ukey, u64 key_size) |
957 | { | |
958 | if (key_size) | |
959 | return memdup_user(ukey, key_size); | |
960 | ||
961 | if (ukey) | |
962 | return ERR_PTR(-EINVAL); | |
963 | ||
964 | return NULL; | |
965 | } | |
966 | ||
db20fd2b | 967 | /* last field in 'union bpf_attr' used by this command */ |
96049f3a | 968 | #define BPF_MAP_LOOKUP_ELEM_LAST_FIELD flags |
db20fd2b AS |
969 | |
970 | static int map_lookup_elem(union bpf_attr *attr) | |
971 | { | |
535e7b4b MS |
972 | void __user *ukey = u64_to_user_ptr(attr->key); |
973 | void __user *uvalue = u64_to_user_ptr(attr->value); | |
db20fd2b | 974 | int ufd = attr->map_fd; |
db20fd2b | 975 | struct bpf_map *map; |
15c14a3d | 976 | void *key, *value; |
15a07b33 | 977 | u32 value_size; |
592867bf | 978 | struct fd f; |
db20fd2b AS |
979 | int err; |
980 | ||
981 | if (CHECK_ATTR(BPF_MAP_LOOKUP_ELEM)) | |
982 | return -EINVAL; | |
983 | ||
96049f3a AS |
984 | if (attr->flags & ~BPF_F_LOCK) |
985 | return -EINVAL; | |
986 | ||
592867bf | 987 | f = fdget(ufd); |
c2101297 | 988 | map = __bpf_map_get(f); |
db20fd2b AS |
989 | if (IS_ERR(map)) |
990 | return PTR_ERR(map); | |
87df15de | 991 | if (!(map_get_sys_perms(map, f) & FMODE_CAN_READ)) { |
6e71b04a CF |
992 | err = -EPERM; |
993 | goto err_put; | |
994 | } | |
995 | ||
96049f3a AS |
996 | if ((attr->flags & BPF_F_LOCK) && |
997 | !map_value_has_spin_lock(map)) { | |
998 | err = -EINVAL; | |
999 | goto err_put; | |
1000 | } | |
1001 | ||
c9d29f46 | 1002 | key = __bpf_copy_key(ukey, map->key_size); |
e4448ed8 AV |
1003 | if (IS_ERR(key)) { |
1004 | err = PTR_ERR(key); | |
db20fd2b | 1005 | goto err_put; |
e4448ed8 | 1006 | } |
db20fd2b | 1007 | |
15c14a3d | 1008 | value_size = bpf_map_value_size(map); |
15a07b33 | 1009 | |
8ebe667c | 1010 | err = -ENOMEM; |
15a07b33 | 1011 | value = kmalloc(value_size, GFP_USER | __GFP_NOWARN); |
db20fd2b | 1012 | if (!value) |
8ebe667c AS |
1013 | goto free_key; |
1014 | ||
15c14a3d | 1015 | err = bpf_map_copy_value(map, key, value, attr->flags); |
15a07b33 | 1016 | if (err) |
8ebe667c | 1017 | goto free_value; |
db20fd2b AS |
1018 | |
1019 | err = -EFAULT; | |
15a07b33 | 1020 | if (copy_to_user(uvalue, value, value_size) != 0) |
8ebe667c | 1021 | goto free_value; |
db20fd2b AS |
1022 | |
1023 | err = 0; | |
1024 | ||
8ebe667c AS |
1025 | free_value: |
1026 | kfree(value); | |
db20fd2b AS |
1027 | free_key: |
1028 | kfree(key); | |
1029 | err_put: | |
1030 | fdput(f); | |
1031 | return err; | |
1032 | } | |
1033 | ||
1ae80cf3 | 1034 | |
3274f520 | 1035 | #define BPF_MAP_UPDATE_ELEM_LAST_FIELD flags |
db20fd2b AS |
1036 | |
1037 | static int map_update_elem(union bpf_attr *attr) | |
1038 | { | |
535e7b4b MS |
1039 | void __user *ukey = u64_to_user_ptr(attr->key); |
1040 | void __user *uvalue = u64_to_user_ptr(attr->value); | |
db20fd2b | 1041 | int ufd = attr->map_fd; |
db20fd2b AS |
1042 | struct bpf_map *map; |
1043 | void *key, *value; | |
15a07b33 | 1044 | u32 value_size; |
592867bf | 1045 | struct fd f; |
db20fd2b AS |
1046 | int err; |
1047 | ||
1048 | if (CHECK_ATTR(BPF_MAP_UPDATE_ELEM)) | |
1049 | return -EINVAL; | |
1050 | ||
592867bf | 1051 | f = fdget(ufd); |
c2101297 | 1052 | map = __bpf_map_get(f); |
db20fd2b AS |
1053 | if (IS_ERR(map)) |
1054 | return PTR_ERR(map); | |
87df15de | 1055 | if (!(map_get_sys_perms(map, f) & FMODE_CAN_WRITE)) { |
6e71b04a CF |
1056 | err = -EPERM; |
1057 | goto err_put; | |
1058 | } | |
1059 | ||
96049f3a AS |
1060 | if ((attr->flags & BPF_F_LOCK) && |
1061 | !map_value_has_spin_lock(map)) { | |
1062 | err = -EINVAL; | |
1063 | goto err_put; | |
1064 | } | |
1065 | ||
c9d29f46 | 1066 | key = __bpf_copy_key(ukey, map->key_size); |
e4448ed8 AV |
1067 | if (IS_ERR(key)) { |
1068 | err = PTR_ERR(key); | |
db20fd2b | 1069 | goto err_put; |
e4448ed8 | 1070 | } |
db20fd2b | 1071 | |
15a07b33 | 1072 | if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH || |
8f844938 | 1073 | map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH || |
b741f163 RG |
1074 | map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY || |
1075 | map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE) | |
15a07b33 AS |
1076 | value_size = round_up(map->value_size, 8) * num_possible_cpus(); |
1077 | else | |
1078 | value_size = map->value_size; | |
1079 | ||
db20fd2b | 1080 | err = -ENOMEM; |
15a07b33 | 1081 | value = kmalloc(value_size, GFP_USER | __GFP_NOWARN); |
db20fd2b AS |
1082 | if (!value) |
1083 | goto free_key; | |
1084 | ||
1085 | err = -EFAULT; | |
15a07b33 | 1086 | if (copy_from_user(value, uvalue, value_size) != 0) |
db20fd2b AS |
1087 | goto free_value; |
1088 | ||
15c14a3d | 1089 | err = bpf_map_update_value(map, f, key, value, attr->flags); |
6710e112 | 1090 | |
db20fd2b AS |
1091 | free_value: |
1092 | kfree(value); | |
1093 | free_key: | |
1094 | kfree(key); | |
1095 | err_put: | |
1096 | fdput(f); | |
1097 | return err; | |
1098 | } | |
1099 | ||
1100 | #define BPF_MAP_DELETE_ELEM_LAST_FIELD key | |
1101 | ||
1102 | static int map_delete_elem(union bpf_attr *attr) | |
1103 | { | |
535e7b4b | 1104 | void __user *ukey = u64_to_user_ptr(attr->key); |
db20fd2b | 1105 | int ufd = attr->map_fd; |
db20fd2b | 1106 | struct bpf_map *map; |
592867bf | 1107 | struct fd f; |
db20fd2b AS |
1108 | void *key; |
1109 | int err; | |
1110 | ||
1111 | if (CHECK_ATTR(BPF_MAP_DELETE_ELEM)) | |
1112 | return -EINVAL; | |
1113 | ||
592867bf | 1114 | f = fdget(ufd); |
c2101297 | 1115 | map = __bpf_map_get(f); |
db20fd2b AS |
1116 | if (IS_ERR(map)) |
1117 | return PTR_ERR(map); | |
87df15de | 1118 | if (!(map_get_sys_perms(map, f) & FMODE_CAN_WRITE)) { |
6e71b04a CF |
1119 | err = -EPERM; |
1120 | goto err_put; | |
1121 | } | |
1122 | ||
c9d29f46 | 1123 | key = __bpf_copy_key(ukey, map->key_size); |
e4448ed8 AV |
1124 | if (IS_ERR(key)) { |
1125 | err = PTR_ERR(key); | |
db20fd2b | 1126 | goto err_put; |
e4448ed8 | 1127 | } |
db20fd2b | 1128 | |
a3884572 JK |
1129 | if (bpf_map_is_dev_bound(map)) { |
1130 | err = bpf_map_offload_delete_elem(map, key); | |
1131 | goto out; | |
85d33df3 MKL |
1132 | } else if (IS_FD_PROG_ARRAY(map) || |
1133 | map->map_type == BPF_MAP_TYPE_STRUCT_OPS) { | |
1134 | /* These maps require sleepable context */ | |
da765a2f DB |
1135 | err = map->ops->map_delete_elem(map, key); |
1136 | goto out; | |
a3884572 JK |
1137 | } |
1138 | ||
b121d1e7 AS |
1139 | preempt_disable(); |
1140 | __this_cpu_inc(bpf_prog_active); | |
db20fd2b AS |
1141 | rcu_read_lock(); |
1142 | err = map->ops->map_delete_elem(map, key); | |
1143 | rcu_read_unlock(); | |
b121d1e7 AS |
1144 | __this_cpu_dec(bpf_prog_active); |
1145 | preempt_enable(); | |
1ae80cf3 | 1146 | maybe_wait_bpf_programs(map); |
a3884572 | 1147 | out: |
db20fd2b AS |
1148 | kfree(key); |
1149 | err_put: | |
1150 | fdput(f); | |
1151 | return err; | |
1152 | } | |
1153 | ||
1154 | /* last field in 'union bpf_attr' used by this command */ | |
1155 | #define BPF_MAP_GET_NEXT_KEY_LAST_FIELD next_key | |
1156 | ||
1157 | static int map_get_next_key(union bpf_attr *attr) | |
1158 | { | |
535e7b4b MS |
1159 | void __user *ukey = u64_to_user_ptr(attr->key); |
1160 | void __user *unext_key = u64_to_user_ptr(attr->next_key); | |
db20fd2b | 1161 | int ufd = attr->map_fd; |
db20fd2b AS |
1162 | struct bpf_map *map; |
1163 | void *key, *next_key; | |
592867bf | 1164 | struct fd f; |
db20fd2b AS |
1165 | int err; |
1166 | ||
1167 | if (CHECK_ATTR(BPF_MAP_GET_NEXT_KEY)) | |
1168 | return -EINVAL; | |
1169 | ||
592867bf | 1170 | f = fdget(ufd); |
c2101297 | 1171 | map = __bpf_map_get(f); |
db20fd2b AS |
1172 | if (IS_ERR(map)) |
1173 | return PTR_ERR(map); | |
87df15de | 1174 | if (!(map_get_sys_perms(map, f) & FMODE_CAN_READ)) { |
6e71b04a CF |
1175 | err = -EPERM; |
1176 | goto err_put; | |
1177 | } | |
1178 | ||
8fe45924 | 1179 | if (ukey) { |
c9d29f46 | 1180 | key = __bpf_copy_key(ukey, map->key_size); |
e4448ed8 AV |
1181 | if (IS_ERR(key)) { |
1182 | err = PTR_ERR(key); | |
8fe45924 | 1183 | goto err_put; |
e4448ed8 | 1184 | } |
8fe45924 TQ |
1185 | } else { |
1186 | key = NULL; | |
1187 | } | |
db20fd2b AS |
1188 | |
1189 | err = -ENOMEM; | |
1190 | next_key = kmalloc(map->key_size, GFP_USER); | |
1191 | if (!next_key) | |
1192 | goto free_key; | |
1193 | ||
a3884572 JK |
1194 | if (bpf_map_is_dev_bound(map)) { |
1195 | err = bpf_map_offload_get_next_key(map, key, next_key); | |
1196 | goto out; | |
1197 | } | |
1198 | ||
db20fd2b AS |
1199 | rcu_read_lock(); |
1200 | err = map->ops->map_get_next_key(map, key, next_key); | |
1201 | rcu_read_unlock(); | |
a3884572 | 1202 | out: |
db20fd2b AS |
1203 | if (err) |
1204 | goto free_next_key; | |
1205 | ||
1206 | err = -EFAULT; | |
1207 | if (copy_to_user(unext_key, next_key, map->key_size) != 0) | |
1208 | goto free_next_key; | |
1209 | ||
1210 | err = 0; | |
1211 | ||
1212 | free_next_key: | |
1213 | kfree(next_key); | |
1214 | free_key: | |
1215 | kfree(key); | |
1216 | err_put: | |
1217 | fdput(f); | |
1218 | return err; | |
1219 | } | |
1220 | ||
aa2e93b8 BV |
1221 | int generic_map_delete_batch(struct bpf_map *map, |
1222 | const union bpf_attr *attr, | |
1223 | union bpf_attr __user *uattr) | |
1224 | { | |
1225 | void __user *keys = u64_to_user_ptr(attr->batch.keys); | |
1226 | u32 cp, max_count; | |
1227 | int err = 0; | |
1228 | void *key; | |
1229 | ||
1230 | if (attr->batch.elem_flags & ~BPF_F_LOCK) | |
1231 | return -EINVAL; | |
1232 | ||
1233 | if ((attr->batch.elem_flags & BPF_F_LOCK) && | |
1234 | !map_value_has_spin_lock(map)) { | |
1235 | return -EINVAL; | |
1236 | } | |
1237 | ||
1238 | max_count = attr->batch.count; | |
1239 | if (!max_count) | |
1240 | return 0; | |
1241 | ||
2e3a94aa BV |
1242 | key = kmalloc(map->key_size, GFP_USER | __GFP_NOWARN); |
1243 | if (!key) | |
1244 | return -ENOMEM; | |
1245 | ||
aa2e93b8 | 1246 | for (cp = 0; cp < max_count; cp++) { |
2e3a94aa BV |
1247 | err = -EFAULT; |
1248 | if (copy_from_user(key, keys + cp * map->key_size, | |
1249 | map->key_size)) | |
aa2e93b8 | 1250 | break; |
aa2e93b8 BV |
1251 | |
1252 | if (bpf_map_is_dev_bound(map)) { | |
1253 | err = bpf_map_offload_delete_elem(map, key); | |
1254 | break; | |
1255 | } | |
1256 | ||
1257 | preempt_disable(); | |
1258 | __this_cpu_inc(bpf_prog_active); | |
1259 | rcu_read_lock(); | |
1260 | err = map->ops->map_delete_elem(map, key); | |
1261 | rcu_read_unlock(); | |
1262 | __this_cpu_dec(bpf_prog_active); | |
1263 | preempt_enable(); | |
1264 | maybe_wait_bpf_programs(map); | |
1265 | if (err) | |
1266 | break; | |
1267 | } | |
1268 | if (copy_to_user(&uattr->batch.count, &cp, sizeof(cp))) | |
1269 | err = -EFAULT; | |
2e3a94aa BV |
1270 | |
1271 | kfree(key); | |
aa2e93b8 BV |
1272 | return err; |
1273 | } | |
1274 | ||
1275 | int generic_map_update_batch(struct bpf_map *map, | |
1276 | const union bpf_attr *attr, | |
1277 | union bpf_attr __user *uattr) | |
1278 | { | |
1279 | void __user *values = u64_to_user_ptr(attr->batch.values); | |
1280 | void __user *keys = u64_to_user_ptr(attr->batch.keys); | |
1281 | u32 value_size, cp, max_count; | |
1282 | int ufd = attr->map_fd; | |
1283 | void *key, *value; | |
1284 | struct fd f; | |
1285 | int err = 0; | |
1286 | ||
1287 | f = fdget(ufd); | |
1288 | if (attr->batch.elem_flags & ~BPF_F_LOCK) | |
1289 | return -EINVAL; | |
1290 | ||
1291 | if ((attr->batch.elem_flags & BPF_F_LOCK) && | |
1292 | !map_value_has_spin_lock(map)) { | |
1293 | return -EINVAL; | |
1294 | } | |
1295 | ||
1296 | value_size = bpf_map_value_size(map); | |
1297 | ||
1298 | max_count = attr->batch.count; | |
1299 | if (!max_count) | |
1300 | return 0; | |
1301 | ||
2e3a94aa BV |
1302 | key = kmalloc(map->key_size, GFP_USER | __GFP_NOWARN); |
1303 | if (!key) | |
1304 | return -ENOMEM; | |
1305 | ||
aa2e93b8 | 1306 | value = kmalloc(value_size, GFP_USER | __GFP_NOWARN); |
2e3a94aa BV |
1307 | if (!value) { |
1308 | kfree(key); | |
aa2e93b8 | 1309 | return -ENOMEM; |
2e3a94aa | 1310 | } |
aa2e93b8 BV |
1311 | |
1312 | for (cp = 0; cp < max_count; cp++) { | |
aa2e93b8 | 1313 | err = -EFAULT; |
2e3a94aa BV |
1314 | if (copy_from_user(key, keys + cp * map->key_size, |
1315 | map->key_size) || | |
1316 | copy_from_user(value, values + cp * value_size, value_size)) | |
aa2e93b8 BV |
1317 | break; |
1318 | ||
1319 | err = bpf_map_update_value(map, f, key, value, | |
1320 | attr->batch.elem_flags); | |
1321 | ||
1322 | if (err) | |
1323 | break; | |
1324 | } | |
1325 | ||
1326 | if (copy_to_user(&uattr->batch.count, &cp, sizeof(cp))) | |
1327 | err = -EFAULT; | |
1328 | ||
1329 | kfree(value); | |
1330 | kfree(key); | |
1331 | return err; | |
1332 | } | |
1333 | ||
cb4d03ab BV |
1334 | #define MAP_LOOKUP_RETRIES 3 |
1335 | ||
1336 | int generic_map_lookup_batch(struct bpf_map *map, | |
1337 | const union bpf_attr *attr, | |
1338 | union bpf_attr __user *uattr) | |
1339 | { | |
1340 | void __user *uobatch = u64_to_user_ptr(attr->batch.out_batch); | |
1341 | void __user *ubatch = u64_to_user_ptr(attr->batch.in_batch); | |
1342 | void __user *values = u64_to_user_ptr(attr->batch.values); | |
1343 | void __user *keys = u64_to_user_ptr(attr->batch.keys); | |
1344 | void *buf, *buf_prevkey, *prev_key, *key, *value; | |
1345 | int err, retry = MAP_LOOKUP_RETRIES; | |
1346 | u32 value_size, cp, max_count; | |
cb4d03ab BV |
1347 | |
1348 | if (attr->batch.elem_flags & ~BPF_F_LOCK) | |
1349 | return -EINVAL; | |
1350 | ||
1351 | if ((attr->batch.elem_flags & BPF_F_LOCK) && | |
1352 | !map_value_has_spin_lock(map)) | |
1353 | return -EINVAL; | |
1354 | ||
1355 | value_size = bpf_map_value_size(map); | |
1356 | ||
1357 | max_count = attr->batch.count; | |
1358 | if (!max_count) | |
1359 | return 0; | |
1360 | ||
1361 | if (put_user(0, &uattr->batch.count)) | |
1362 | return -EFAULT; | |
1363 | ||
1364 | buf_prevkey = kmalloc(map->key_size, GFP_USER | __GFP_NOWARN); | |
1365 | if (!buf_prevkey) | |
1366 | return -ENOMEM; | |
1367 | ||
1368 | buf = kmalloc(map->key_size + value_size, GFP_USER | __GFP_NOWARN); | |
1369 | if (!buf) { | |
1370 | kvfree(buf_prevkey); | |
1371 | return -ENOMEM; | |
1372 | } | |
1373 | ||
1374 | err = -EFAULT; | |
cb4d03ab BV |
1375 | prev_key = NULL; |
1376 | if (ubatch && copy_from_user(buf_prevkey, ubatch, map->key_size)) | |
1377 | goto free_buf; | |
1378 | key = buf; | |
1379 | value = key + map->key_size; | |
1380 | if (ubatch) | |
1381 | prev_key = buf_prevkey; | |
1382 | ||
1383 | for (cp = 0; cp < max_count;) { | |
1384 | rcu_read_lock(); | |
1385 | err = map->ops->map_get_next_key(map, prev_key, key); | |
1386 | rcu_read_unlock(); | |
1387 | if (err) | |
1388 | break; | |
1389 | err = bpf_map_copy_value(map, key, value, | |
1390 | attr->batch.elem_flags); | |
1391 | ||
1392 | if (err == -ENOENT) { | |
1393 | if (retry) { | |
1394 | retry--; | |
1395 | continue; | |
1396 | } | |
1397 | err = -EINTR; | |
1398 | break; | |
1399 | } | |
1400 | ||
1401 | if (err) | |
1402 | goto free_buf; | |
1403 | ||
1404 | if (copy_to_user(keys + cp * map->key_size, key, | |
1405 | map->key_size)) { | |
1406 | err = -EFAULT; | |
1407 | goto free_buf; | |
1408 | } | |
1409 | if (copy_to_user(values + cp * value_size, value, value_size)) { | |
1410 | err = -EFAULT; | |
1411 | goto free_buf; | |
1412 | } | |
1413 | ||
1414 | if (!prev_key) | |
1415 | prev_key = buf_prevkey; | |
1416 | ||
1417 | swap(prev_key, key); | |
1418 | retry = MAP_LOOKUP_RETRIES; | |
1419 | cp++; | |
1420 | } | |
1421 | ||
1422 | if (err == -EFAULT) | |
1423 | goto free_buf; | |
1424 | ||
1425 | if ((copy_to_user(&uattr->batch.count, &cp, sizeof(cp)) || | |
1426 | (cp && copy_to_user(uobatch, prev_key, map->key_size)))) | |
1427 | err = -EFAULT; | |
1428 | ||
1429 | free_buf: | |
1430 | kfree(buf_prevkey); | |
1431 | kfree(buf); | |
1432 | return err; | |
1433 | } | |
1434 | ||
bd513cd0 MV |
1435 | #define BPF_MAP_LOOKUP_AND_DELETE_ELEM_LAST_FIELD value |
1436 | ||
1437 | static int map_lookup_and_delete_elem(union bpf_attr *attr) | |
1438 | { | |
1439 | void __user *ukey = u64_to_user_ptr(attr->key); | |
1440 | void __user *uvalue = u64_to_user_ptr(attr->value); | |
1441 | int ufd = attr->map_fd; | |
1442 | struct bpf_map *map; | |
540fefc0 | 1443 | void *key, *value; |
bd513cd0 MV |
1444 | u32 value_size; |
1445 | struct fd f; | |
1446 | int err; | |
1447 | ||
1448 | if (CHECK_ATTR(BPF_MAP_LOOKUP_AND_DELETE_ELEM)) | |
1449 | return -EINVAL; | |
1450 | ||
1451 | f = fdget(ufd); | |
1452 | map = __bpf_map_get(f); | |
1453 | if (IS_ERR(map)) | |
1454 | return PTR_ERR(map); | |
87df15de | 1455 | if (!(map_get_sys_perms(map, f) & FMODE_CAN_WRITE)) { |
bd513cd0 MV |
1456 | err = -EPERM; |
1457 | goto err_put; | |
1458 | } | |
1459 | ||
1460 | key = __bpf_copy_key(ukey, map->key_size); | |
1461 | if (IS_ERR(key)) { | |
1462 | err = PTR_ERR(key); | |
1463 | goto err_put; | |
1464 | } | |
1465 | ||
1466 | value_size = map->value_size; | |
1467 | ||
1468 | err = -ENOMEM; | |
1469 | value = kmalloc(value_size, GFP_USER | __GFP_NOWARN); | |
1470 | if (!value) | |
1471 | goto free_key; | |
1472 | ||
1473 | if (map->map_type == BPF_MAP_TYPE_QUEUE || | |
1474 | map->map_type == BPF_MAP_TYPE_STACK) { | |
1475 | err = map->ops->map_pop_elem(map, value); | |
1476 | } else { | |
1477 | err = -ENOTSUPP; | |
1478 | } | |
1479 | ||
1480 | if (err) | |
1481 | goto free_value; | |
1482 | ||
1483 | if (copy_to_user(uvalue, value, value_size) != 0) | |
1484 | goto free_value; | |
1485 | ||
1486 | err = 0; | |
1487 | ||
1488 | free_value: | |
1489 | kfree(value); | |
1490 | free_key: | |
1491 | kfree(key); | |
1492 | err_put: | |
1493 | fdput(f); | |
1494 | return err; | |
1495 | } | |
1496 | ||
87df15de DB |
1497 | #define BPF_MAP_FREEZE_LAST_FIELD map_fd |
1498 | ||
1499 | static int map_freeze(const union bpf_attr *attr) | |
1500 | { | |
1501 | int err = 0, ufd = attr->map_fd; | |
1502 | struct bpf_map *map; | |
1503 | struct fd f; | |
1504 | ||
1505 | if (CHECK_ATTR(BPF_MAP_FREEZE)) | |
1506 | return -EINVAL; | |
1507 | ||
1508 | f = fdget(ufd); | |
1509 | map = __bpf_map_get(f); | |
1510 | if (IS_ERR(map)) | |
1511 | return PTR_ERR(map); | |
fc970227 AN |
1512 | |
1513 | mutex_lock(&map->freeze_mutex); | |
1514 | ||
1515 | if (map->writecnt) { | |
1516 | err = -EBUSY; | |
1517 | goto err_put; | |
1518 | } | |
87df15de DB |
1519 | if (READ_ONCE(map->frozen)) { |
1520 | err = -EBUSY; | |
1521 | goto err_put; | |
1522 | } | |
1523 | if (!capable(CAP_SYS_ADMIN)) { | |
1524 | err = -EPERM; | |
1525 | goto err_put; | |
1526 | } | |
1527 | ||
1528 | WRITE_ONCE(map->frozen, true); | |
1529 | err_put: | |
fc970227 | 1530 | mutex_unlock(&map->freeze_mutex); |
87df15de DB |
1531 | fdput(f); |
1532 | return err; | |
1533 | } | |
1534 | ||
7de16e3a | 1535 | static const struct bpf_prog_ops * const bpf_prog_types[] = { |
91cc1a99 | 1536 | #define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \ |
7de16e3a JK |
1537 | [_id] = & _name ## _prog_ops, |
1538 | #define BPF_MAP_TYPE(_id, _ops) | |
1539 | #include <linux/bpf_types.h> | |
1540 | #undef BPF_PROG_TYPE | |
1541 | #undef BPF_MAP_TYPE | |
1542 | }; | |
1543 | ||
09756af4 AS |
1544 | static int find_prog_type(enum bpf_prog_type type, struct bpf_prog *prog) |
1545 | { | |
d0f1a451 DB |
1546 | const struct bpf_prog_ops *ops; |
1547 | ||
1548 | if (type >= ARRAY_SIZE(bpf_prog_types)) | |
1549 | return -EINVAL; | |
1550 | type = array_index_nospec(type, ARRAY_SIZE(bpf_prog_types)); | |
1551 | ops = bpf_prog_types[type]; | |
1552 | if (!ops) | |
be9370a7 | 1553 | return -EINVAL; |
09756af4 | 1554 | |
ab3f0063 | 1555 | if (!bpf_prog_is_dev_bound(prog->aux)) |
d0f1a451 | 1556 | prog->aux->ops = ops; |
ab3f0063 JK |
1557 | else |
1558 | prog->aux->ops = &bpf_offload_prog_ops; | |
be9370a7 JB |
1559 | prog->type = type; |
1560 | return 0; | |
09756af4 AS |
1561 | } |
1562 | ||
bae141f5 DB |
1563 | enum bpf_audit { |
1564 | BPF_AUDIT_LOAD, | |
1565 | BPF_AUDIT_UNLOAD, | |
1566 | BPF_AUDIT_MAX, | |
1567 | }; | |
1568 | ||
1569 | static const char * const bpf_audit_str[BPF_AUDIT_MAX] = { | |
1570 | [BPF_AUDIT_LOAD] = "LOAD", | |
1571 | [BPF_AUDIT_UNLOAD] = "UNLOAD", | |
1572 | }; | |
1573 | ||
1574 | static void bpf_audit_prog(const struct bpf_prog *prog, unsigned int op) | |
1575 | { | |
1576 | struct audit_context *ctx = NULL; | |
1577 | struct audit_buffer *ab; | |
1578 | ||
1579 | if (WARN_ON_ONCE(op >= BPF_AUDIT_MAX)) | |
1580 | return; | |
1581 | if (audit_enabled == AUDIT_OFF) | |
1582 | return; | |
1583 | if (op == BPF_AUDIT_LOAD) | |
1584 | ctx = audit_context(); | |
1585 | ab = audit_log_start(ctx, GFP_ATOMIC, AUDIT_BPF); | |
1586 | if (unlikely(!ab)) | |
1587 | return; | |
1588 | audit_log_format(ab, "prog-id=%u op=%s", | |
1589 | prog->aux->id, bpf_audit_str[op]); | |
1590 | audit_log_end(ab); | |
1591 | } | |
1592 | ||
5ccb071e DB |
1593 | int __bpf_prog_charge(struct user_struct *user, u32 pages) |
1594 | { | |
1595 | unsigned long memlock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
1596 | unsigned long user_bufs; | |
1597 | ||
1598 | if (user) { | |
1599 | user_bufs = atomic_long_add_return(pages, &user->locked_vm); | |
1600 | if (user_bufs > memlock_limit) { | |
1601 | atomic_long_sub(pages, &user->locked_vm); | |
1602 | return -EPERM; | |
1603 | } | |
1604 | } | |
1605 | ||
1606 | return 0; | |
1607 | } | |
1608 | ||
1609 | void __bpf_prog_uncharge(struct user_struct *user, u32 pages) | |
1610 | { | |
1611 | if (user) | |
1612 | atomic_long_sub(pages, &user->locked_vm); | |
1613 | } | |
1614 | ||
aaac3ba9 AS |
1615 | static int bpf_prog_charge_memlock(struct bpf_prog *prog) |
1616 | { | |
1617 | struct user_struct *user = get_current_user(); | |
5ccb071e | 1618 | int ret; |
aaac3ba9 | 1619 | |
5ccb071e DB |
1620 | ret = __bpf_prog_charge(user, prog->pages); |
1621 | if (ret) { | |
aaac3ba9 | 1622 | free_uid(user); |
5ccb071e | 1623 | return ret; |
aaac3ba9 | 1624 | } |
5ccb071e | 1625 | |
aaac3ba9 AS |
1626 | prog->aux->user = user; |
1627 | return 0; | |
1628 | } | |
1629 | ||
1630 | static void bpf_prog_uncharge_memlock(struct bpf_prog *prog) | |
1631 | { | |
1632 | struct user_struct *user = prog->aux->user; | |
1633 | ||
5ccb071e | 1634 | __bpf_prog_uncharge(user, prog->pages); |
aaac3ba9 AS |
1635 | free_uid(user); |
1636 | } | |
1637 | ||
dc4bb0e2 MKL |
1638 | static int bpf_prog_alloc_id(struct bpf_prog *prog) |
1639 | { | |
1640 | int id; | |
1641 | ||
b76354cd | 1642 | idr_preload(GFP_KERNEL); |
dc4bb0e2 MKL |
1643 | spin_lock_bh(&prog_idr_lock); |
1644 | id = idr_alloc_cyclic(&prog_idr, prog, 1, INT_MAX, GFP_ATOMIC); | |
1645 | if (id > 0) | |
1646 | prog->aux->id = id; | |
1647 | spin_unlock_bh(&prog_idr_lock); | |
b76354cd | 1648 | idr_preload_end(); |
dc4bb0e2 MKL |
1649 | |
1650 | /* id is in [1, INT_MAX) */ | |
1651 | if (WARN_ON_ONCE(!id)) | |
1652 | return -ENOSPC; | |
1653 | ||
1654 | return id > 0 ? 0 : id; | |
1655 | } | |
1656 | ||
ad8ad79f | 1657 | void bpf_prog_free_id(struct bpf_prog *prog, bool do_idr_lock) |
dc4bb0e2 | 1658 | { |
ad8ad79f JK |
1659 | /* cBPF to eBPF migrations are currently not in the idr store. |
1660 | * Offloaded programs are removed from the store when their device | |
1661 | * disappears - even if someone grabs an fd to them they are unusable, | |
1662 | * simply waiting for refcnt to drop to be freed. | |
1663 | */ | |
dc4bb0e2 MKL |
1664 | if (!prog->aux->id) |
1665 | return; | |
1666 | ||
b16d9aa4 MKL |
1667 | if (do_idr_lock) |
1668 | spin_lock_bh(&prog_idr_lock); | |
1669 | else | |
1670 | __acquire(&prog_idr_lock); | |
1671 | ||
dc4bb0e2 | 1672 | idr_remove(&prog_idr, prog->aux->id); |
ad8ad79f | 1673 | prog->aux->id = 0; |
b16d9aa4 MKL |
1674 | |
1675 | if (do_idr_lock) | |
1676 | spin_unlock_bh(&prog_idr_lock); | |
1677 | else | |
1678 | __release(&prog_idr_lock); | |
dc4bb0e2 MKL |
1679 | } |
1680 | ||
1aacde3d | 1681 | static void __bpf_prog_put_rcu(struct rcu_head *rcu) |
abf2e7d6 AS |
1682 | { |
1683 | struct bpf_prog_aux *aux = container_of(rcu, struct bpf_prog_aux, rcu); | |
1684 | ||
3b4d9eb2 | 1685 | kvfree(aux->func_info); |
8c1b6e69 | 1686 | kfree(aux->func_info_aux); |
aaac3ba9 | 1687 | bpf_prog_uncharge_memlock(aux->prog); |
afdb09c7 | 1688 | security_bpf_prog_free(aux); |
abf2e7d6 AS |
1689 | bpf_prog_free(aux->prog); |
1690 | } | |
1691 | ||
cd7455f1 DB |
1692 | static void __bpf_prog_put_noref(struct bpf_prog *prog, bool deferred) |
1693 | { | |
1694 | bpf_prog_kallsyms_del_all(prog); | |
1695 | btf_put(prog->aux->btf); | |
cd7455f1 DB |
1696 | bpf_prog_free_linfo(prog); |
1697 | ||
1698 | if (deferred) | |
1699 | call_rcu(&prog->aux->rcu, __bpf_prog_put_rcu); | |
1700 | else | |
1701 | __bpf_prog_put_rcu(&prog->aux->rcu); | |
1702 | } | |
1703 | ||
b16d9aa4 | 1704 | static void __bpf_prog_put(struct bpf_prog *prog, bool do_idr_lock) |
09756af4 | 1705 | { |
85192dbf | 1706 | if (atomic64_dec_and_test(&prog->aux->refcnt)) { |
6ee52e2a | 1707 | perf_event_bpf_event(prog, PERF_BPF_EVENT_PROG_UNLOAD, 0); |
bae141f5 | 1708 | bpf_audit_prog(prog, BPF_AUDIT_UNLOAD); |
34ad5580 | 1709 | /* bpf_prog_free_id() must be called first */ |
b16d9aa4 | 1710 | bpf_prog_free_id(prog, do_idr_lock); |
cd7455f1 | 1711 | __bpf_prog_put_noref(prog, true); |
a67edbf4 | 1712 | } |
09756af4 | 1713 | } |
b16d9aa4 MKL |
1714 | |
1715 | void bpf_prog_put(struct bpf_prog *prog) | |
1716 | { | |
1717 | __bpf_prog_put(prog, true); | |
1718 | } | |
e2e9b654 | 1719 | EXPORT_SYMBOL_GPL(bpf_prog_put); |
09756af4 AS |
1720 | |
1721 | static int bpf_prog_release(struct inode *inode, struct file *filp) | |
1722 | { | |
1723 | struct bpf_prog *prog = filp->private_data; | |
1724 | ||
1aacde3d | 1725 | bpf_prog_put(prog); |
09756af4 AS |
1726 | return 0; |
1727 | } | |
1728 | ||
492ecee8 AS |
1729 | static void bpf_prog_get_stats(const struct bpf_prog *prog, |
1730 | struct bpf_prog_stats *stats) | |
1731 | { | |
1732 | u64 nsecs = 0, cnt = 0; | |
1733 | int cpu; | |
1734 | ||
1735 | for_each_possible_cpu(cpu) { | |
1736 | const struct bpf_prog_stats *st; | |
1737 | unsigned int start; | |
1738 | u64 tnsecs, tcnt; | |
1739 | ||
1740 | st = per_cpu_ptr(prog->aux->stats, cpu); | |
1741 | do { | |
1742 | start = u64_stats_fetch_begin_irq(&st->syncp); | |
1743 | tnsecs = st->nsecs; | |
1744 | tcnt = st->cnt; | |
1745 | } while (u64_stats_fetch_retry_irq(&st->syncp, start)); | |
1746 | nsecs += tnsecs; | |
1747 | cnt += tcnt; | |
1748 | } | |
1749 | stats->nsecs = nsecs; | |
1750 | stats->cnt = cnt; | |
1751 | } | |
1752 | ||
7bd509e3 DB |
1753 | #ifdef CONFIG_PROC_FS |
1754 | static void bpf_prog_show_fdinfo(struct seq_file *m, struct file *filp) | |
1755 | { | |
1756 | const struct bpf_prog *prog = filp->private_data; | |
f1f7714e | 1757 | char prog_tag[sizeof(prog->tag) * 2 + 1] = { }; |
492ecee8 | 1758 | struct bpf_prog_stats stats; |
7bd509e3 | 1759 | |
492ecee8 | 1760 | bpf_prog_get_stats(prog, &stats); |
f1f7714e | 1761 | bin2hex(prog_tag, prog->tag, sizeof(prog->tag)); |
7bd509e3 DB |
1762 | seq_printf(m, |
1763 | "prog_type:\t%u\n" | |
1764 | "prog_jited:\t%u\n" | |
f1f7714e | 1765 | "prog_tag:\t%s\n" |
4316b409 | 1766 | "memlock:\t%llu\n" |
492ecee8 AS |
1767 | "prog_id:\t%u\n" |
1768 | "run_time_ns:\t%llu\n" | |
1769 | "run_cnt:\t%llu\n", | |
7bd509e3 DB |
1770 | prog->type, |
1771 | prog->jited, | |
f1f7714e | 1772 | prog_tag, |
4316b409 | 1773 | prog->pages * 1ULL << PAGE_SHIFT, |
492ecee8 AS |
1774 | prog->aux->id, |
1775 | stats.nsecs, | |
1776 | stats.cnt); | |
7bd509e3 DB |
1777 | } |
1778 | #endif | |
1779 | ||
f66e448c | 1780 | const struct file_operations bpf_prog_fops = { |
7bd509e3 DB |
1781 | #ifdef CONFIG_PROC_FS |
1782 | .show_fdinfo = bpf_prog_show_fdinfo, | |
1783 | #endif | |
1784 | .release = bpf_prog_release, | |
6e71b04a CF |
1785 | .read = bpf_dummy_read, |
1786 | .write = bpf_dummy_write, | |
09756af4 AS |
1787 | }; |
1788 | ||
b2197755 | 1789 | int bpf_prog_new_fd(struct bpf_prog *prog) |
aa79781b | 1790 | { |
afdb09c7 CF |
1791 | int ret; |
1792 | ||
1793 | ret = security_bpf_prog(prog); | |
1794 | if (ret < 0) | |
1795 | return ret; | |
1796 | ||
aa79781b DB |
1797 | return anon_inode_getfd("bpf-prog", &bpf_prog_fops, prog, |
1798 | O_RDWR | O_CLOEXEC); | |
1799 | } | |
1800 | ||
113214be | 1801 | static struct bpf_prog *____bpf_prog_get(struct fd f) |
09756af4 | 1802 | { |
09756af4 AS |
1803 | if (!f.file) |
1804 | return ERR_PTR(-EBADF); | |
09756af4 AS |
1805 | if (f.file->f_op != &bpf_prog_fops) { |
1806 | fdput(f); | |
1807 | return ERR_PTR(-EINVAL); | |
1808 | } | |
1809 | ||
c2101297 | 1810 | return f.file->private_data; |
09756af4 AS |
1811 | } |
1812 | ||
85192dbf | 1813 | void bpf_prog_add(struct bpf_prog *prog, int i) |
92117d84 | 1814 | { |
85192dbf | 1815 | atomic64_add(i, &prog->aux->refcnt); |
92117d84 | 1816 | } |
59d3656d BB |
1817 | EXPORT_SYMBOL_GPL(bpf_prog_add); |
1818 | ||
c540594f DB |
1819 | void bpf_prog_sub(struct bpf_prog *prog, int i) |
1820 | { | |
1821 | /* Only to be used for undoing previous bpf_prog_add() in some | |
1822 | * error path. We still know that another entity in our call | |
1823 | * path holds a reference to the program, thus atomic_sub() can | |
1824 | * be safely used in such cases! | |
1825 | */ | |
85192dbf | 1826 | WARN_ON(atomic64_sub_return(i, &prog->aux->refcnt) == 0); |
c540594f DB |
1827 | } |
1828 | EXPORT_SYMBOL_GPL(bpf_prog_sub); | |
1829 | ||
85192dbf | 1830 | void bpf_prog_inc(struct bpf_prog *prog) |
59d3656d | 1831 | { |
85192dbf | 1832 | atomic64_inc(&prog->aux->refcnt); |
59d3656d | 1833 | } |
97bc402d | 1834 | EXPORT_SYMBOL_GPL(bpf_prog_inc); |
92117d84 | 1835 | |
b16d9aa4 | 1836 | /* prog_idr_lock should have been held */ |
a6f6df69 | 1837 | struct bpf_prog *bpf_prog_inc_not_zero(struct bpf_prog *prog) |
b16d9aa4 MKL |
1838 | { |
1839 | int refold; | |
1840 | ||
85192dbf | 1841 | refold = atomic64_fetch_add_unless(&prog->aux->refcnt, 1, 0); |
b16d9aa4 MKL |
1842 | |
1843 | if (!refold) | |
1844 | return ERR_PTR(-ENOENT); | |
1845 | ||
1846 | return prog; | |
1847 | } | |
a6f6df69 | 1848 | EXPORT_SYMBOL_GPL(bpf_prog_inc_not_zero); |
b16d9aa4 | 1849 | |
040ee692 | 1850 | bool bpf_prog_get_ok(struct bpf_prog *prog, |
288b3de5 | 1851 | enum bpf_prog_type *attach_type, bool attach_drv) |
248f346f | 1852 | { |
288b3de5 JK |
1853 | /* not an attachment, just a refcount inc, always allow */ |
1854 | if (!attach_type) | |
1855 | return true; | |
248f346f JK |
1856 | |
1857 | if (prog->type != *attach_type) | |
1858 | return false; | |
288b3de5 | 1859 | if (bpf_prog_is_dev_bound(prog->aux) && !attach_drv) |
248f346f JK |
1860 | return false; |
1861 | ||
1862 | return true; | |
1863 | } | |
1864 | ||
1865 | static struct bpf_prog *__bpf_prog_get(u32 ufd, enum bpf_prog_type *attach_type, | |
288b3de5 | 1866 | bool attach_drv) |
09756af4 AS |
1867 | { |
1868 | struct fd f = fdget(ufd); | |
1869 | struct bpf_prog *prog; | |
1870 | ||
113214be | 1871 | prog = ____bpf_prog_get(f); |
09756af4 AS |
1872 | if (IS_ERR(prog)) |
1873 | return prog; | |
288b3de5 | 1874 | if (!bpf_prog_get_ok(prog, attach_type, attach_drv)) { |
113214be DB |
1875 | prog = ERR_PTR(-EINVAL); |
1876 | goto out; | |
1877 | } | |
09756af4 | 1878 | |
85192dbf | 1879 | bpf_prog_inc(prog); |
113214be | 1880 | out: |
09756af4 AS |
1881 | fdput(f); |
1882 | return prog; | |
1883 | } | |
113214be DB |
1884 | |
1885 | struct bpf_prog *bpf_prog_get(u32 ufd) | |
1886 | { | |
288b3de5 | 1887 | return __bpf_prog_get(ufd, NULL, false); |
113214be DB |
1888 | } |
1889 | ||
248f346f | 1890 | struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type, |
288b3de5 | 1891 | bool attach_drv) |
248f346f | 1892 | { |
4d220ed0 | 1893 | return __bpf_prog_get(ufd, &type, attach_drv); |
248f346f | 1894 | } |
6c8dfe21 | 1895 | EXPORT_SYMBOL_GPL(bpf_prog_get_type_dev); |
248f346f | 1896 | |
aac3fc32 AI |
1897 | /* Initially all BPF programs could be loaded w/o specifying |
1898 | * expected_attach_type. Later for some of them specifying expected_attach_type | |
1899 | * at load time became required so that program could be validated properly. | |
1900 | * Programs of types that are allowed to be loaded both w/ and w/o (for | |
1901 | * backward compatibility) expected_attach_type, should have the default attach | |
1902 | * type assigned to expected_attach_type for the latter case, so that it can be | |
1903 | * validated later at attach time. | |
1904 | * | |
1905 | * bpf_prog_load_fixup_attach_type() sets expected_attach_type in @attr if | |
1906 | * prog type requires it but has some attach types that have to be backward | |
1907 | * compatible. | |
1908 | */ | |
1909 | static void bpf_prog_load_fixup_attach_type(union bpf_attr *attr) | |
1910 | { | |
1911 | switch (attr->prog_type) { | |
1912 | case BPF_PROG_TYPE_CGROUP_SOCK: | |
1913 | /* Unfortunately BPF_ATTACH_TYPE_UNSPEC enumeration doesn't | |
1914 | * exist so checking for non-zero is the way to go here. | |
1915 | */ | |
1916 | if (!attr->expected_attach_type) | |
1917 | attr->expected_attach_type = | |
1918 | BPF_CGROUP_INET_SOCK_CREATE; | |
1919 | break; | |
1920 | } | |
1921 | } | |
1922 | ||
5e43f899 | 1923 | static int |
ccfe29eb AS |
1924 | bpf_prog_load_check_attach(enum bpf_prog_type prog_type, |
1925 | enum bpf_attach_type expected_attach_type, | |
5b92a28a | 1926 | u32 btf_id, u32 prog_fd) |
5e43f899 | 1927 | { |
27ae7997 | 1928 | if (btf_id) { |
c108e3c1 AS |
1929 | if (btf_id > BTF_MAX_TYPE) |
1930 | return -EINVAL; | |
27ae7997 MKL |
1931 | |
1932 | switch (prog_type) { | |
1933 | case BPF_PROG_TYPE_TRACING: | |
1934 | case BPF_PROG_TYPE_STRUCT_OPS: | |
be8704ff | 1935 | case BPF_PROG_TYPE_EXT: |
27ae7997 MKL |
1936 | break; |
1937 | default: | |
c108e3c1 | 1938 | return -EINVAL; |
27ae7997 | 1939 | } |
c108e3c1 AS |
1940 | } |
1941 | ||
be8704ff AS |
1942 | if (prog_fd && prog_type != BPF_PROG_TYPE_TRACING && |
1943 | prog_type != BPF_PROG_TYPE_EXT) | |
27ae7997 MKL |
1944 | return -EINVAL; |
1945 | ||
4fbac77d | 1946 | switch (prog_type) { |
aac3fc32 AI |
1947 | case BPF_PROG_TYPE_CGROUP_SOCK: |
1948 | switch (expected_attach_type) { | |
1949 | case BPF_CGROUP_INET_SOCK_CREATE: | |
1950 | case BPF_CGROUP_INET4_POST_BIND: | |
1951 | case BPF_CGROUP_INET6_POST_BIND: | |
1952 | return 0; | |
1953 | default: | |
1954 | return -EINVAL; | |
1955 | } | |
4fbac77d AI |
1956 | case BPF_PROG_TYPE_CGROUP_SOCK_ADDR: |
1957 | switch (expected_attach_type) { | |
1958 | case BPF_CGROUP_INET4_BIND: | |
1959 | case BPF_CGROUP_INET6_BIND: | |
d74bad4e AI |
1960 | case BPF_CGROUP_INET4_CONNECT: |
1961 | case BPF_CGROUP_INET6_CONNECT: | |
1cedee13 AI |
1962 | case BPF_CGROUP_UDP4_SENDMSG: |
1963 | case BPF_CGROUP_UDP6_SENDMSG: | |
983695fa DB |
1964 | case BPF_CGROUP_UDP4_RECVMSG: |
1965 | case BPF_CGROUP_UDP6_RECVMSG: | |
4fbac77d AI |
1966 | return 0; |
1967 | default: | |
1968 | return -EINVAL; | |
1969 | } | |
5cf1e914 | 1970 | case BPF_PROG_TYPE_CGROUP_SKB: |
1971 | switch (expected_attach_type) { | |
1972 | case BPF_CGROUP_INET_INGRESS: | |
1973 | case BPF_CGROUP_INET_EGRESS: | |
1974 | return 0; | |
1975 | default: | |
1976 | return -EINVAL; | |
1977 | } | |
0d01da6a SF |
1978 | case BPF_PROG_TYPE_CGROUP_SOCKOPT: |
1979 | switch (expected_attach_type) { | |
1980 | case BPF_CGROUP_SETSOCKOPT: | |
1981 | case BPF_CGROUP_GETSOCKOPT: | |
1982 | return 0; | |
1983 | default: | |
1984 | return -EINVAL; | |
1985 | } | |
be8704ff AS |
1986 | case BPF_PROG_TYPE_EXT: |
1987 | if (expected_attach_type) | |
1988 | return -EINVAL; | |
1989 | /* fallthrough */ | |
4fbac77d AI |
1990 | default: |
1991 | return 0; | |
1992 | } | |
5e43f899 AI |
1993 | } |
1994 | ||
09756af4 | 1995 | /* last field in 'union bpf_attr' used by this command */ |
5b92a28a | 1996 | #define BPF_PROG_LOAD_LAST_FIELD attach_prog_fd |
09756af4 | 1997 | |
838e9690 | 1998 | static int bpf_prog_load(union bpf_attr *attr, union bpf_attr __user *uattr) |
09756af4 AS |
1999 | { |
2000 | enum bpf_prog_type type = attr->prog_type; | |
2001 | struct bpf_prog *prog; | |
2002 | int err; | |
2003 | char license[128]; | |
2004 | bool is_gpl; | |
2005 | ||
2006 | if (CHECK_ATTR(BPF_PROG_LOAD)) | |
2007 | return -EINVAL; | |
2008 | ||
c240eff6 JW |
2009 | if (attr->prog_flags & ~(BPF_F_STRICT_ALIGNMENT | |
2010 | BPF_F_ANY_ALIGNMENT | | |
10d274e8 | 2011 | BPF_F_TEST_STATE_FREQ | |
c240eff6 | 2012 | BPF_F_TEST_RND_HI32)) |
e07b98d9 DM |
2013 | return -EINVAL; |
2014 | ||
e9ee9efc DM |
2015 | if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && |
2016 | (attr->prog_flags & BPF_F_ANY_ALIGNMENT) && | |
2017 | !capable(CAP_SYS_ADMIN)) | |
2018 | return -EPERM; | |
2019 | ||
09756af4 | 2020 | /* copy eBPF program license from user space */ |
535e7b4b | 2021 | if (strncpy_from_user(license, u64_to_user_ptr(attr->license), |
09756af4 AS |
2022 | sizeof(license) - 1) < 0) |
2023 | return -EFAULT; | |
2024 | license[sizeof(license) - 1] = 0; | |
2025 | ||
2026 | /* eBPF programs must be GPL compatible to use GPL-ed functions */ | |
2027 | is_gpl = license_is_gpl_compatible(license); | |
2028 | ||
c04c0d2b AS |
2029 | if (attr->insn_cnt == 0 || |
2030 | attr->insn_cnt > (capable(CAP_SYS_ADMIN) ? BPF_COMPLEXITY_LIMIT_INSNS : BPF_MAXINSNS)) | |
ef0915ca | 2031 | return -E2BIG; |
80b7d819 CF |
2032 | if (type != BPF_PROG_TYPE_SOCKET_FILTER && |
2033 | type != BPF_PROG_TYPE_CGROUP_SKB && | |
2034 | !capable(CAP_SYS_ADMIN)) | |
1be7f75d AS |
2035 | return -EPERM; |
2036 | ||
aac3fc32 | 2037 | bpf_prog_load_fixup_attach_type(attr); |
ccfe29eb | 2038 | if (bpf_prog_load_check_attach(type, attr->expected_attach_type, |
5b92a28a AS |
2039 | attr->attach_btf_id, |
2040 | attr->attach_prog_fd)) | |
5e43f899 AI |
2041 | return -EINVAL; |
2042 | ||
09756af4 AS |
2043 | /* plain bpf_prog allocation */ |
2044 | prog = bpf_prog_alloc(bpf_prog_size(attr->insn_cnt), GFP_USER); | |
2045 | if (!prog) | |
2046 | return -ENOMEM; | |
2047 | ||
5e43f899 | 2048 | prog->expected_attach_type = attr->expected_attach_type; |
ccfe29eb | 2049 | prog->aux->attach_btf_id = attr->attach_btf_id; |
5b92a28a AS |
2050 | if (attr->attach_prog_fd) { |
2051 | struct bpf_prog *tgt_prog; | |
2052 | ||
2053 | tgt_prog = bpf_prog_get(attr->attach_prog_fd); | |
2054 | if (IS_ERR(tgt_prog)) { | |
2055 | err = PTR_ERR(tgt_prog); | |
2056 | goto free_prog_nouncharge; | |
2057 | } | |
2058 | prog->aux->linked_prog = tgt_prog; | |
2059 | } | |
5e43f899 | 2060 | |
9a18eedb JK |
2061 | prog->aux->offload_requested = !!attr->prog_ifindex; |
2062 | ||
afdb09c7 | 2063 | err = security_bpf_prog_alloc(prog->aux); |
aaac3ba9 AS |
2064 | if (err) |
2065 | goto free_prog_nouncharge; | |
2066 | ||
afdb09c7 CF |
2067 | err = bpf_prog_charge_memlock(prog); |
2068 | if (err) | |
2069 | goto free_prog_sec; | |
2070 | ||
09756af4 AS |
2071 | prog->len = attr->insn_cnt; |
2072 | ||
2073 | err = -EFAULT; | |
535e7b4b | 2074 | if (copy_from_user(prog->insns, u64_to_user_ptr(attr->insns), |
aafe6ae9 | 2075 | bpf_prog_insn_size(prog)) != 0) |
09756af4 AS |
2076 | goto free_prog; |
2077 | ||
2078 | prog->orig_prog = NULL; | |
a91263d5 | 2079 | prog->jited = 0; |
09756af4 | 2080 | |
85192dbf | 2081 | atomic64_set(&prog->aux->refcnt, 1); |
a91263d5 | 2082 | prog->gpl_compatible = is_gpl ? 1 : 0; |
09756af4 | 2083 | |
9a18eedb | 2084 | if (bpf_prog_is_dev_bound(prog->aux)) { |
ab3f0063 JK |
2085 | err = bpf_prog_offload_init(prog, attr); |
2086 | if (err) | |
2087 | goto free_prog; | |
2088 | } | |
2089 | ||
09756af4 AS |
2090 | /* find program type: socket_filter vs tracing_filter */ |
2091 | err = find_prog_type(type, prog); | |
2092 | if (err < 0) | |
2093 | goto free_prog; | |
2094 | ||
9285ec4c | 2095 | prog->aux->load_time = ktime_get_boottime_ns(); |
cb4d2b3f MKL |
2096 | err = bpf_obj_name_cpy(prog->aux->name, attr->prog_name); |
2097 | if (err) | |
2098 | goto free_prog; | |
2099 | ||
09756af4 | 2100 | /* run eBPF verifier */ |
838e9690 | 2101 | err = bpf_check(&prog, attr, uattr); |
09756af4 AS |
2102 | if (err < 0) |
2103 | goto free_used_maps; | |
2104 | ||
9facc336 | 2105 | prog = bpf_prog_select_runtime(prog, &err); |
04fd61ab AS |
2106 | if (err < 0) |
2107 | goto free_used_maps; | |
09756af4 | 2108 | |
dc4bb0e2 MKL |
2109 | err = bpf_prog_alloc_id(prog); |
2110 | if (err) | |
2111 | goto free_used_maps; | |
2112 | ||
c751798a DB |
2113 | /* Upon success of bpf_prog_alloc_id(), the BPF prog is |
2114 | * effectively publicly exposed. However, retrieving via | |
2115 | * bpf_prog_get_fd_by_id() will take another reference, | |
2116 | * therefore it cannot be gone underneath us. | |
2117 | * | |
2118 | * Only for the time /after/ successful bpf_prog_new_fd() | |
2119 | * and before returning to userspace, we might just hold | |
2120 | * one reference and any parallel close on that fd could | |
2121 | * rip everything out. Hence, below notifications must | |
2122 | * happen before bpf_prog_new_fd(). | |
2123 | * | |
2124 | * Also, any failure handling from this point onwards must | |
2125 | * be using bpf_prog_put() given the program is exposed. | |
2126 | */ | |
74451e66 | 2127 | bpf_prog_kallsyms_add(prog); |
6ee52e2a | 2128 | perf_event_bpf_event(prog, PERF_BPF_EVENT_PROG_LOAD, 0); |
bae141f5 | 2129 | bpf_audit_prog(prog, BPF_AUDIT_LOAD); |
c751798a DB |
2130 | |
2131 | err = bpf_prog_new_fd(prog); | |
2132 | if (err < 0) | |
2133 | bpf_prog_put(prog); | |
09756af4 AS |
2134 | return err; |
2135 | ||
2136 | free_used_maps: | |
cd7455f1 DB |
2137 | /* In case we have subprogs, we need to wait for a grace |
2138 | * period before we can tear down JIT memory since symbols | |
2139 | * are already exposed under kallsyms. | |
2140 | */ | |
2141 | __bpf_prog_put_noref(prog, prog->aux->func_cnt); | |
2142 | return err; | |
09756af4 | 2143 | free_prog: |
aaac3ba9 | 2144 | bpf_prog_uncharge_memlock(prog); |
afdb09c7 CF |
2145 | free_prog_sec: |
2146 | security_bpf_prog_free(prog->aux); | |
aaac3ba9 | 2147 | free_prog_nouncharge: |
09756af4 AS |
2148 | bpf_prog_free(prog); |
2149 | return err; | |
2150 | } | |
2151 | ||
6e71b04a | 2152 | #define BPF_OBJ_LAST_FIELD file_flags |
b2197755 DB |
2153 | |
2154 | static int bpf_obj_pin(const union bpf_attr *attr) | |
2155 | { | |
6e71b04a | 2156 | if (CHECK_ATTR(BPF_OBJ) || attr->file_flags != 0) |
b2197755 DB |
2157 | return -EINVAL; |
2158 | ||
535e7b4b | 2159 | return bpf_obj_pin_user(attr->bpf_fd, u64_to_user_ptr(attr->pathname)); |
b2197755 DB |
2160 | } |
2161 | ||
2162 | static int bpf_obj_get(const union bpf_attr *attr) | |
2163 | { | |
6e71b04a CF |
2164 | if (CHECK_ATTR(BPF_OBJ) || attr->bpf_fd != 0 || |
2165 | attr->file_flags & ~BPF_OBJ_FLAG_MASK) | |
b2197755 DB |
2166 | return -EINVAL; |
2167 | ||
6e71b04a CF |
2168 | return bpf_obj_get_user(u64_to_user_ptr(attr->pathname), |
2169 | attr->file_flags); | |
b2197755 DB |
2170 | } |
2171 | ||
fec56f58 AS |
2172 | static int bpf_tracing_prog_release(struct inode *inode, struct file *filp) |
2173 | { | |
2174 | struct bpf_prog *prog = filp->private_data; | |
2175 | ||
2176 | WARN_ON_ONCE(bpf_trampoline_unlink_prog(prog)); | |
2177 | bpf_prog_put(prog); | |
2178 | return 0; | |
2179 | } | |
2180 | ||
2181 | static const struct file_operations bpf_tracing_prog_fops = { | |
2182 | .release = bpf_tracing_prog_release, | |
2183 | .read = bpf_dummy_read, | |
2184 | .write = bpf_dummy_write, | |
2185 | }; | |
2186 | ||
2187 | static int bpf_tracing_prog_attach(struct bpf_prog *prog) | |
2188 | { | |
2189 | int tr_fd, err; | |
2190 | ||
2191 | if (prog->expected_attach_type != BPF_TRACE_FENTRY && | |
be8704ff AS |
2192 | prog->expected_attach_type != BPF_TRACE_FEXIT && |
2193 | prog->type != BPF_PROG_TYPE_EXT) { | |
fec56f58 AS |
2194 | err = -EINVAL; |
2195 | goto out_put_prog; | |
2196 | } | |
2197 | ||
2198 | err = bpf_trampoline_link_prog(prog); | |
2199 | if (err) | |
2200 | goto out_put_prog; | |
2201 | ||
2202 | tr_fd = anon_inode_getfd("bpf-tracing-prog", &bpf_tracing_prog_fops, | |
2203 | prog, O_CLOEXEC); | |
2204 | if (tr_fd < 0) { | |
2205 | WARN_ON_ONCE(bpf_trampoline_unlink_prog(prog)); | |
2206 | err = tr_fd; | |
2207 | goto out_put_prog; | |
2208 | } | |
2209 | return tr_fd; | |
2210 | ||
2211 | out_put_prog: | |
2212 | bpf_prog_put(prog); | |
2213 | return err; | |
2214 | } | |
2215 | ||
c4f6699d AS |
2216 | struct bpf_raw_tracepoint { |
2217 | struct bpf_raw_event_map *btp; | |
2218 | struct bpf_prog *prog; | |
2219 | }; | |
2220 | ||
2221 | static int bpf_raw_tracepoint_release(struct inode *inode, struct file *filp) | |
2222 | { | |
2223 | struct bpf_raw_tracepoint *raw_tp = filp->private_data; | |
2224 | ||
2225 | if (raw_tp->prog) { | |
2226 | bpf_probe_unregister(raw_tp->btp, raw_tp->prog); | |
2227 | bpf_prog_put(raw_tp->prog); | |
2228 | } | |
a38d1107 | 2229 | bpf_put_raw_tracepoint(raw_tp->btp); |
c4f6699d AS |
2230 | kfree(raw_tp); |
2231 | return 0; | |
2232 | } | |
2233 | ||
2234 | static const struct file_operations bpf_raw_tp_fops = { | |
2235 | .release = bpf_raw_tracepoint_release, | |
2236 | .read = bpf_dummy_read, | |
2237 | .write = bpf_dummy_write, | |
2238 | }; | |
2239 | ||
2240 | #define BPF_RAW_TRACEPOINT_OPEN_LAST_FIELD raw_tracepoint.prog_fd | |
2241 | ||
2242 | static int bpf_raw_tracepoint_open(const union bpf_attr *attr) | |
2243 | { | |
2244 | struct bpf_raw_tracepoint *raw_tp; | |
2245 | struct bpf_raw_event_map *btp; | |
2246 | struct bpf_prog *prog; | |
ac4414b5 AS |
2247 | const char *tp_name; |
2248 | char buf[128]; | |
c4f6699d AS |
2249 | int tp_fd, err; |
2250 | ||
ac4414b5 AS |
2251 | if (CHECK_ATTR(BPF_RAW_TRACEPOINT_OPEN)) |
2252 | return -EINVAL; | |
2253 | ||
2254 | prog = bpf_prog_get(attr->raw_tracepoint.prog_fd); | |
2255 | if (IS_ERR(prog)) | |
2256 | return PTR_ERR(prog); | |
2257 | ||
2258 | if (prog->type != BPF_PROG_TYPE_RAW_TRACEPOINT && | |
f1b9509c | 2259 | prog->type != BPF_PROG_TYPE_TRACING && |
be8704ff | 2260 | prog->type != BPF_PROG_TYPE_EXT && |
ac4414b5 AS |
2261 | prog->type != BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE) { |
2262 | err = -EINVAL; | |
2263 | goto out_put_prog; | |
2264 | } | |
2265 | ||
be8704ff AS |
2266 | if (prog->type == BPF_PROG_TYPE_TRACING || |
2267 | prog->type == BPF_PROG_TYPE_EXT) { | |
ac4414b5 | 2268 | if (attr->raw_tracepoint.name) { |
fec56f58 AS |
2269 | /* The attach point for this category of programs |
2270 | * should be specified via btf_id during program load. | |
ac4414b5 AS |
2271 | */ |
2272 | err = -EINVAL; | |
2273 | goto out_put_prog; | |
2274 | } | |
fec56f58 AS |
2275 | if (prog->expected_attach_type == BPF_TRACE_RAW_TP) |
2276 | tp_name = prog->aux->attach_func_name; | |
2277 | else | |
2278 | return bpf_tracing_prog_attach(prog); | |
ac4414b5 AS |
2279 | } else { |
2280 | if (strncpy_from_user(buf, | |
2281 | u64_to_user_ptr(attr->raw_tracepoint.name), | |
2282 | sizeof(buf) - 1) < 0) { | |
2283 | err = -EFAULT; | |
2284 | goto out_put_prog; | |
2285 | } | |
2286 | buf[sizeof(buf) - 1] = 0; | |
2287 | tp_name = buf; | |
2288 | } | |
c4f6699d | 2289 | |
a38d1107 | 2290 | btp = bpf_get_raw_tracepoint(tp_name); |
ac4414b5 AS |
2291 | if (!btp) { |
2292 | err = -ENOENT; | |
2293 | goto out_put_prog; | |
2294 | } | |
c4f6699d AS |
2295 | |
2296 | raw_tp = kzalloc(sizeof(*raw_tp), GFP_USER); | |
a38d1107 MM |
2297 | if (!raw_tp) { |
2298 | err = -ENOMEM; | |
2299 | goto out_put_btp; | |
2300 | } | |
c4f6699d | 2301 | raw_tp->btp = btp; |
ac4414b5 | 2302 | raw_tp->prog = prog; |
c4f6699d AS |
2303 | |
2304 | err = bpf_probe_register(raw_tp->btp, prog); | |
2305 | if (err) | |
ac4414b5 | 2306 | goto out_free_tp; |
c4f6699d | 2307 | |
c4f6699d AS |
2308 | tp_fd = anon_inode_getfd("bpf-raw-tracepoint", &bpf_raw_tp_fops, raw_tp, |
2309 | O_CLOEXEC); | |
2310 | if (tp_fd < 0) { | |
2311 | bpf_probe_unregister(raw_tp->btp, prog); | |
2312 | err = tp_fd; | |
ac4414b5 | 2313 | goto out_free_tp; |
c4f6699d AS |
2314 | } |
2315 | return tp_fd; | |
2316 | ||
c4f6699d AS |
2317 | out_free_tp: |
2318 | kfree(raw_tp); | |
a38d1107 MM |
2319 | out_put_btp: |
2320 | bpf_put_raw_tracepoint(btp); | |
ac4414b5 AS |
2321 | out_put_prog: |
2322 | bpf_prog_put(prog); | |
c4f6699d AS |
2323 | return err; |
2324 | } | |
2325 | ||
33491588 AR |
2326 | static int bpf_prog_attach_check_attach_type(const struct bpf_prog *prog, |
2327 | enum bpf_attach_type attach_type) | |
2328 | { | |
2329 | switch (prog->type) { | |
2330 | case BPF_PROG_TYPE_CGROUP_SOCK: | |
2331 | case BPF_PROG_TYPE_CGROUP_SOCK_ADDR: | |
0d01da6a | 2332 | case BPF_PROG_TYPE_CGROUP_SOCKOPT: |
33491588 | 2333 | return attach_type == prog->expected_attach_type ? 0 : -EINVAL; |
5cf1e914 | 2334 | case BPF_PROG_TYPE_CGROUP_SKB: |
2335 | return prog->enforce_expected_attach_type && | |
2336 | prog->expected_attach_type != attach_type ? | |
2337 | -EINVAL : 0; | |
33491588 AR |
2338 | default: |
2339 | return 0; | |
2340 | } | |
2341 | } | |
2342 | ||
7dd68b32 | 2343 | #define BPF_PROG_ATTACH_LAST_FIELD replace_bpf_fd |
174a79ff | 2344 | |
324bda9e | 2345 | #define BPF_F_ATTACH_MASK \ |
7dd68b32 | 2346 | (BPF_F_ALLOW_OVERRIDE | BPF_F_ALLOW_MULTI | BPF_F_REPLACE) |
324bda9e | 2347 | |
f4324551 DM |
2348 | static int bpf_prog_attach(const union bpf_attr *attr) |
2349 | { | |
7f677633 | 2350 | enum bpf_prog_type ptype; |
f4324551 | 2351 | struct bpf_prog *prog; |
7f677633 | 2352 | int ret; |
f4324551 DM |
2353 | |
2354 | if (!capable(CAP_NET_ADMIN)) | |
2355 | return -EPERM; | |
2356 | ||
2357 | if (CHECK_ATTR(BPF_PROG_ATTACH)) | |
2358 | return -EINVAL; | |
2359 | ||
324bda9e | 2360 | if (attr->attach_flags & ~BPF_F_ATTACH_MASK) |
7f677633 AS |
2361 | return -EINVAL; |
2362 | ||
f4324551 DM |
2363 | switch (attr->attach_type) { |
2364 | case BPF_CGROUP_INET_INGRESS: | |
2365 | case BPF_CGROUP_INET_EGRESS: | |
b2cd1257 | 2366 | ptype = BPF_PROG_TYPE_CGROUP_SKB; |
f4324551 | 2367 | break; |
61023658 | 2368 | case BPF_CGROUP_INET_SOCK_CREATE: |
aac3fc32 AI |
2369 | case BPF_CGROUP_INET4_POST_BIND: |
2370 | case BPF_CGROUP_INET6_POST_BIND: | |
61023658 DA |
2371 | ptype = BPF_PROG_TYPE_CGROUP_SOCK; |
2372 | break; | |
4fbac77d AI |
2373 | case BPF_CGROUP_INET4_BIND: |
2374 | case BPF_CGROUP_INET6_BIND: | |
d74bad4e AI |
2375 | case BPF_CGROUP_INET4_CONNECT: |
2376 | case BPF_CGROUP_INET6_CONNECT: | |
1cedee13 AI |
2377 | case BPF_CGROUP_UDP4_SENDMSG: |
2378 | case BPF_CGROUP_UDP6_SENDMSG: | |
983695fa DB |
2379 | case BPF_CGROUP_UDP4_RECVMSG: |
2380 | case BPF_CGROUP_UDP6_RECVMSG: | |
4fbac77d AI |
2381 | ptype = BPF_PROG_TYPE_CGROUP_SOCK_ADDR; |
2382 | break; | |
40304b2a LB |
2383 | case BPF_CGROUP_SOCK_OPS: |
2384 | ptype = BPF_PROG_TYPE_SOCK_OPS; | |
2385 | break; | |
ebc614f6 RG |
2386 | case BPF_CGROUP_DEVICE: |
2387 | ptype = BPF_PROG_TYPE_CGROUP_DEVICE; | |
2388 | break; | |
4f738adb | 2389 | case BPF_SK_MSG_VERDICT: |
fdb5c453 SY |
2390 | ptype = BPF_PROG_TYPE_SK_MSG; |
2391 | break; | |
464bc0fd JF |
2392 | case BPF_SK_SKB_STREAM_PARSER: |
2393 | case BPF_SK_SKB_STREAM_VERDICT: | |
fdb5c453 SY |
2394 | ptype = BPF_PROG_TYPE_SK_SKB; |
2395 | break; | |
f4364dcf | 2396 | case BPF_LIRC_MODE2: |
fdb5c453 SY |
2397 | ptype = BPF_PROG_TYPE_LIRC_MODE2; |
2398 | break; | |
d58e468b PP |
2399 | case BPF_FLOW_DISSECTOR: |
2400 | ptype = BPF_PROG_TYPE_FLOW_DISSECTOR; | |
2401 | break; | |
7b146ceb AI |
2402 | case BPF_CGROUP_SYSCTL: |
2403 | ptype = BPF_PROG_TYPE_CGROUP_SYSCTL; | |
2404 | break; | |
0d01da6a SF |
2405 | case BPF_CGROUP_GETSOCKOPT: |
2406 | case BPF_CGROUP_SETSOCKOPT: | |
2407 | ptype = BPF_PROG_TYPE_CGROUP_SOCKOPT; | |
2408 | break; | |
f4324551 DM |
2409 | default: |
2410 | return -EINVAL; | |
2411 | } | |
2412 | ||
b2cd1257 DA |
2413 | prog = bpf_prog_get_type(attr->attach_bpf_fd, ptype); |
2414 | if (IS_ERR(prog)) | |
2415 | return PTR_ERR(prog); | |
2416 | ||
5e43f899 AI |
2417 | if (bpf_prog_attach_check_attach_type(prog, attr->attach_type)) { |
2418 | bpf_prog_put(prog); | |
2419 | return -EINVAL; | |
2420 | } | |
2421 | ||
fdb5c453 SY |
2422 | switch (ptype) { |
2423 | case BPF_PROG_TYPE_SK_SKB: | |
2424 | case BPF_PROG_TYPE_SK_MSG: | |
604326b4 | 2425 | ret = sock_map_get_from_fd(attr, prog); |
fdb5c453 SY |
2426 | break; |
2427 | case BPF_PROG_TYPE_LIRC_MODE2: | |
2428 | ret = lirc_prog_attach(attr, prog); | |
2429 | break; | |
d58e468b PP |
2430 | case BPF_PROG_TYPE_FLOW_DISSECTOR: |
2431 | ret = skb_flow_dissector_bpf_prog_attach(attr, prog); | |
2432 | break; | |
fdb5c453 SY |
2433 | default: |
2434 | ret = cgroup_bpf_prog_attach(attr, ptype, prog); | |
b2cd1257 DA |
2435 | } |
2436 | ||
7f677633 AS |
2437 | if (ret) |
2438 | bpf_prog_put(prog); | |
7f677633 | 2439 | return ret; |
f4324551 DM |
2440 | } |
2441 | ||
2442 | #define BPF_PROG_DETACH_LAST_FIELD attach_type | |
2443 | ||
2444 | static int bpf_prog_detach(const union bpf_attr *attr) | |
2445 | { | |
324bda9e | 2446 | enum bpf_prog_type ptype; |
f4324551 DM |
2447 | |
2448 | if (!capable(CAP_NET_ADMIN)) | |
2449 | return -EPERM; | |
2450 | ||
2451 | if (CHECK_ATTR(BPF_PROG_DETACH)) | |
2452 | return -EINVAL; | |
2453 | ||
2454 | switch (attr->attach_type) { | |
2455 | case BPF_CGROUP_INET_INGRESS: | |
2456 | case BPF_CGROUP_INET_EGRESS: | |
324bda9e AS |
2457 | ptype = BPF_PROG_TYPE_CGROUP_SKB; |
2458 | break; | |
61023658 | 2459 | case BPF_CGROUP_INET_SOCK_CREATE: |
aac3fc32 AI |
2460 | case BPF_CGROUP_INET4_POST_BIND: |
2461 | case BPF_CGROUP_INET6_POST_BIND: | |
324bda9e AS |
2462 | ptype = BPF_PROG_TYPE_CGROUP_SOCK; |
2463 | break; | |
4fbac77d AI |
2464 | case BPF_CGROUP_INET4_BIND: |
2465 | case BPF_CGROUP_INET6_BIND: | |
d74bad4e AI |
2466 | case BPF_CGROUP_INET4_CONNECT: |
2467 | case BPF_CGROUP_INET6_CONNECT: | |
1cedee13 AI |
2468 | case BPF_CGROUP_UDP4_SENDMSG: |
2469 | case BPF_CGROUP_UDP6_SENDMSG: | |
983695fa DB |
2470 | case BPF_CGROUP_UDP4_RECVMSG: |
2471 | case BPF_CGROUP_UDP6_RECVMSG: | |
4fbac77d AI |
2472 | ptype = BPF_PROG_TYPE_CGROUP_SOCK_ADDR; |
2473 | break; | |
40304b2a | 2474 | case BPF_CGROUP_SOCK_OPS: |
324bda9e | 2475 | ptype = BPF_PROG_TYPE_SOCK_OPS; |
f4324551 | 2476 | break; |
ebc614f6 RG |
2477 | case BPF_CGROUP_DEVICE: |
2478 | ptype = BPF_PROG_TYPE_CGROUP_DEVICE; | |
2479 | break; | |
4f738adb | 2480 | case BPF_SK_MSG_VERDICT: |
604326b4 | 2481 | return sock_map_get_from_fd(attr, NULL); |
5a67da2a JF |
2482 | case BPF_SK_SKB_STREAM_PARSER: |
2483 | case BPF_SK_SKB_STREAM_VERDICT: | |
604326b4 | 2484 | return sock_map_get_from_fd(attr, NULL); |
f4364dcf SY |
2485 | case BPF_LIRC_MODE2: |
2486 | return lirc_prog_detach(attr); | |
d58e468b PP |
2487 | case BPF_FLOW_DISSECTOR: |
2488 | return skb_flow_dissector_bpf_prog_detach(attr); | |
7b146ceb AI |
2489 | case BPF_CGROUP_SYSCTL: |
2490 | ptype = BPF_PROG_TYPE_CGROUP_SYSCTL; | |
2491 | break; | |
0d01da6a SF |
2492 | case BPF_CGROUP_GETSOCKOPT: |
2493 | case BPF_CGROUP_SETSOCKOPT: | |
2494 | ptype = BPF_PROG_TYPE_CGROUP_SOCKOPT; | |
2495 | break; | |
f4324551 DM |
2496 | default: |
2497 | return -EINVAL; | |
2498 | } | |
2499 | ||
fdb5c453 | 2500 | return cgroup_bpf_prog_detach(attr, ptype); |
f4324551 | 2501 | } |
40304b2a | 2502 | |
468e2f64 AS |
2503 | #define BPF_PROG_QUERY_LAST_FIELD query.prog_cnt |
2504 | ||
2505 | static int bpf_prog_query(const union bpf_attr *attr, | |
2506 | union bpf_attr __user *uattr) | |
2507 | { | |
468e2f64 AS |
2508 | if (!capable(CAP_NET_ADMIN)) |
2509 | return -EPERM; | |
2510 | if (CHECK_ATTR(BPF_PROG_QUERY)) | |
2511 | return -EINVAL; | |
2512 | if (attr->query.query_flags & ~BPF_F_QUERY_EFFECTIVE) | |
2513 | return -EINVAL; | |
2514 | ||
2515 | switch (attr->query.attach_type) { | |
2516 | case BPF_CGROUP_INET_INGRESS: | |
2517 | case BPF_CGROUP_INET_EGRESS: | |
2518 | case BPF_CGROUP_INET_SOCK_CREATE: | |
4fbac77d AI |
2519 | case BPF_CGROUP_INET4_BIND: |
2520 | case BPF_CGROUP_INET6_BIND: | |
aac3fc32 AI |
2521 | case BPF_CGROUP_INET4_POST_BIND: |
2522 | case BPF_CGROUP_INET6_POST_BIND: | |
d74bad4e AI |
2523 | case BPF_CGROUP_INET4_CONNECT: |
2524 | case BPF_CGROUP_INET6_CONNECT: | |
1cedee13 AI |
2525 | case BPF_CGROUP_UDP4_SENDMSG: |
2526 | case BPF_CGROUP_UDP6_SENDMSG: | |
983695fa DB |
2527 | case BPF_CGROUP_UDP4_RECVMSG: |
2528 | case BPF_CGROUP_UDP6_RECVMSG: | |
468e2f64 | 2529 | case BPF_CGROUP_SOCK_OPS: |
ebc614f6 | 2530 | case BPF_CGROUP_DEVICE: |
7b146ceb | 2531 | case BPF_CGROUP_SYSCTL: |
0d01da6a SF |
2532 | case BPF_CGROUP_GETSOCKOPT: |
2533 | case BPF_CGROUP_SETSOCKOPT: | |
468e2f64 | 2534 | break; |
f4364dcf SY |
2535 | case BPF_LIRC_MODE2: |
2536 | return lirc_prog_query(attr, uattr); | |
118c8e9a SF |
2537 | case BPF_FLOW_DISSECTOR: |
2538 | return skb_flow_dissector_prog_query(attr, uattr); | |
468e2f64 AS |
2539 | default: |
2540 | return -EINVAL; | |
2541 | } | |
fdb5c453 SY |
2542 | |
2543 | return cgroup_bpf_prog_query(attr, uattr); | |
468e2f64 | 2544 | } |
f4324551 | 2545 | |
b0b9395d | 2546 | #define BPF_PROG_TEST_RUN_LAST_FIELD test.ctx_out |
1cf1cae9 AS |
2547 | |
2548 | static int bpf_prog_test_run(const union bpf_attr *attr, | |
2549 | union bpf_attr __user *uattr) | |
2550 | { | |
2551 | struct bpf_prog *prog; | |
2552 | int ret = -ENOTSUPP; | |
2553 | ||
61f3c964 AS |
2554 | if (!capable(CAP_SYS_ADMIN)) |
2555 | return -EPERM; | |
1cf1cae9 AS |
2556 | if (CHECK_ATTR(BPF_PROG_TEST_RUN)) |
2557 | return -EINVAL; | |
2558 | ||
b0b9395d SF |
2559 | if ((attr->test.ctx_size_in && !attr->test.ctx_in) || |
2560 | (!attr->test.ctx_size_in && attr->test.ctx_in)) | |
2561 | return -EINVAL; | |
2562 | ||
2563 | if ((attr->test.ctx_size_out && !attr->test.ctx_out) || | |
2564 | (!attr->test.ctx_size_out && attr->test.ctx_out)) | |
2565 | return -EINVAL; | |
2566 | ||
1cf1cae9 AS |
2567 | prog = bpf_prog_get(attr->test.prog_fd); |
2568 | if (IS_ERR(prog)) | |
2569 | return PTR_ERR(prog); | |
2570 | ||
2571 | if (prog->aux->ops->test_run) | |
2572 | ret = prog->aux->ops->test_run(prog, attr, uattr); | |
2573 | ||
2574 | bpf_prog_put(prog); | |
2575 | return ret; | |
2576 | } | |
2577 | ||
34ad5580 MKL |
2578 | #define BPF_OBJ_GET_NEXT_ID_LAST_FIELD next_id |
2579 | ||
2580 | static int bpf_obj_get_next_id(const union bpf_attr *attr, | |
2581 | union bpf_attr __user *uattr, | |
2582 | struct idr *idr, | |
2583 | spinlock_t *lock) | |
2584 | { | |
2585 | u32 next_id = attr->start_id; | |
2586 | int err = 0; | |
2587 | ||
2588 | if (CHECK_ATTR(BPF_OBJ_GET_NEXT_ID) || next_id >= INT_MAX) | |
2589 | return -EINVAL; | |
2590 | ||
2591 | if (!capable(CAP_SYS_ADMIN)) | |
2592 | return -EPERM; | |
2593 | ||
2594 | next_id++; | |
2595 | spin_lock_bh(lock); | |
2596 | if (!idr_get_next(idr, &next_id)) | |
2597 | err = -ENOENT; | |
2598 | spin_unlock_bh(lock); | |
2599 | ||
2600 | if (!err) | |
2601 | err = put_user(next_id, &uattr->next_id); | |
2602 | ||
2603 | return err; | |
2604 | } | |
2605 | ||
b16d9aa4 MKL |
2606 | #define BPF_PROG_GET_FD_BY_ID_LAST_FIELD prog_id |
2607 | ||
7e6897f9 | 2608 | struct bpf_prog *bpf_prog_by_id(u32 id) |
b16d9aa4 MKL |
2609 | { |
2610 | struct bpf_prog *prog; | |
b16d9aa4 | 2611 | |
7e6897f9 BT |
2612 | if (!id) |
2613 | return ERR_PTR(-ENOENT); | |
b16d9aa4 MKL |
2614 | |
2615 | spin_lock_bh(&prog_idr_lock); | |
2616 | prog = idr_find(&prog_idr, id); | |
2617 | if (prog) | |
2618 | prog = bpf_prog_inc_not_zero(prog); | |
2619 | else | |
2620 | prog = ERR_PTR(-ENOENT); | |
2621 | spin_unlock_bh(&prog_idr_lock); | |
7e6897f9 BT |
2622 | return prog; |
2623 | } | |
2624 | ||
2625 | static int bpf_prog_get_fd_by_id(const union bpf_attr *attr) | |
2626 | { | |
2627 | struct bpf_prog *prog; | |
2628 | u32 id = attr->prog_id; | |
2629 | int fd; | |
2630 | ||
2631 | if (CHECK_ATTR(BPF_PROG_GET_FD_BY_ID)) | |
2632 | return -EINVAL; | |
2633 | ||
2634 | if (!capable(CAP_SYS_ADMIN)) | |
2635 | return -EPERM; | |
b16d9aa4 | 2636 | |
7e6897f9 | 2637 | prog = bpf_prog_by_id(id); |
b16d9aa4 MKL |
2638 | if (IS_ERR(prog)) |
2639 | return PTR_ERR(prog); | |
2640 | ||
2641 | fd = bpf_prog_new_fd(prog); | |
2642 | if (fd < 0) | |
2643 | bpf_prog_put(prog); | |
2644 | ||
2645 | return fd; | |
2646 | } | |
2647 | ||
6e71b04a | 2648 | #define BPF_MAP_GET_FD_BY_ID_LAST_FIELD open_flags |
bd5f5f4e MKL |
2649 | |
2650 | static int bpf_map_get_fd_by_id(const union bpf_attr *attr) | |
2651 | { | |
2652 | struct bpf_map *map; | |
2653 | u32 id = attr->map_id; | |
6e71b04a | 2654 | int f_flags; |
bd5f5f4e MKL |
2655 | int fd; |
2656 | ||
6e71b04a CF |
2657 | if (CHECK_ATTR(BPF_MAP_GET_FD_BY_ID) || |
2658 | attr->open_flags & ~BPF_OBJ_FLAG_MASK) | |
bd5f5f4e MKL |
2659 | return -EINVAL; |
2660 | ||
2661 | if (!capable(CAP_SYS_ADMIN)) | |
2662 | return -EPERM; | |
2663 | ||
6e71b04a CF |
2664 | f_flags = bpf_get_file_flag(attr->open_flags); |
2665 | if (f_flags < 0) | |
2666 | return f_flags; | |
2667 | ||
bd5f5f4e MKL |
2668 | spin_lock_bh(&map_idr_lock); |
2669 | map = idr_find(&map_idr, id); | |
2670 | if (map) | |
b0e4701c | 2671 | map = __bpf_map_inc_not_zero(map, true); |
bd5f5f4e MKL |
2672 | else |
2673 | map = ERR_PTR(-ENOENT); | |
2674 | spin_unlock_bh(&map_idr_lock); | |
2675 | ||
2676 | if (IS_ERR(map)) | |
2677 | return PTR_ERR(map); | |
2678 | ||
6e71b04a | 2679 | fd = bpf_map_new_fd(map, f_flags); |
bd5f5f4e | 2680 | if (fd < 0) |
781e6282 | 2681 | bpf_map_put_with_uref(map); |
bd5f5f4e MKL |
2682 | |
2683 | return fd; | |
2684 | } | |
2685 | ||
7105e828 | 2686 | static const struct bpf_map *bpf_map_from_imm(const struct bpf_prog *prog, |
d8eca5bb DB |
2687 | unsigned long addr, u32 *off, |
2688 | u32 *type) | |
7105e828 | 2689 | { |
d8eca5bb | 2690 | const struct bpf_map *map; |
7105e828 DB |
2691 | int i; |
2692 | ||
d8eca5bb DB |
2693 | for (i = 0, *off = 0; i < prog->aux->used_map_cnt; i++) { |
2694 | map = prog->aux->used_maps[i]; | |
2695 | if (map == (void *)addr) { | |
2696 | *type = BPF_PSEUDO_MAP_FD; | |
2697 | return map; | |
2698 | } | |
2699 | if (!map->ops->map_direct_value_meta) | |
2700 | continue; | |
2701 | if (!map->ops->map_direct_value_meta(map, addr, off)) { | |
2702 | *type = BPF_PSEUDO_MAP_VALUE; | |
2703 | return map; | |
2704 | } | |
2705 | } | |
2706 | ||
7105e828 DB |
2707 | return NULL; |
2708 | } | |
2709 | ||
2710 | static struct bpf_insn *bpf_insn_prepare_dump(const struct bpf_prog *prog) | |
2711 | { | |
2712 | const struct bpf_map *map; | |
2713 | struct bpf_insn *insns; | |
d8eca5bb | 2714 | u32 off, type; |
7105e828 DB |
2715 | u64 imm; |
2716 | int i; | |
2717 | ||
2718 | insns = kmemdup(prog->insnsi, bpf_prog_insn_size(prog), | |
2719 | GFP_USER); | |
2720 | if (!insns) | |
2721 | return insns; | |
2722 | ||
2723 | for (i = 0; i < prog->len; i++) { | |
2724 | if (insns[i].code == (BPF_JMP | BPF_TAIL_CALL)) { | |
2725 | insns[i].code = BPF_JMP | BPF_CALL; | |
2726 | insns[i].imm = BPF_FUNC_tail_call; | |
2727 | /* fall-through */ | |
2728 | } | |
2729 | if (insns[i].code == (BPF_JMP | BPF_CALL) || | |
2730 | insns[i].code == (BPF_JMP | BPF_CALL_ARGS)) { | |
2731 | if (insns[i].code == (BPF_JMP | BPF_CALL_ARGS)) | |
2732 | insns[i].code = BPF_JMP | BPF_CALL; | |
2733 | if (!bpf_dump_raw_ok()) | |
2734 | insns[i].imm = 0; | |
2735 | continue; | |
2736 | } | |
2737 | ||
2738 | if (insns[i].code != (BPF_LD | BPF_IMM | BPF_DW)) | |
2739 | continue; | |
2740 | ||
2741 | imm = ((u64)insns[i + 1].imm << 32) | (u32)insns[i].imm; | |
d8eca5bb | 2742 | map = bpf_map_from_imm(prog, imm, &off, &type); |
7105e828 | 2743 | if (map) { |
d8eca5bb | 2744 | insns[i].src_reg = type; |
7105e828 | 2745 | insns[i].imm = map->id; |
d8eca5bb | 2746 | insns[i + 1].imm = off; |
7105e828 DB |
2747 | continue; |
2748 | } | |
7105e828 DB |
2749 | } |
2750 | ||
2751 | return insns; | |
2752 | } | |
2753 | ||
c454a46b MKL |
2754 | static int set_info_rec_size(struct bpf_prog_info *info) |
2755 | { | |
2756 | /* | |
2757 | * Ensure info.*_rec_size is the same as kernel expected size | |
2758 | * | |
2759 | * or | |
2760 | * | |
2761 | * Only allow zero *_rec_size if both _rec_size and _cnt are | |
2762 | * zero. In this case, the kernel will set the expected | |
2763 | * _rec_size back to the info. | |
2764 | */ | |
2765 | ||
11d8b82d | 2766 | if ((info->nr_func_info || info->func_info_rec_size) && |
c454a46b MKL |
2767 | info->func_info_rec_size != sizeof(struct bpf_func_info)) |
2768 | return -EINVAL; | |
2769 | ||
11d8b82d | 2770 | if ((info->nr_line_info || info->line_info_rec_size) && |
c454a46b MKL |
2771 | info->line_info_rec_size != sizeof(struct bpf_line_info)) |
2772 | return -EINVAL; | |
2773 | ||
11d8b82d | 2774 | if ((info->nr_jited_line_info || info->jited_line_info_rec_size) && |
c454a46b MKL |
2775 | info->jited_line_info_rec_size != sizeof(__u64)) |
2776 | return -EINVAL; | |
2777 | ||
2778 | info->func_info_rec_size = sizeof(struct bpf_func_info); | |
2779 | info->line_info_rec_size = sizeof(struct bpf_line_info); | |
2780 | info->jited_line_info_rec_size = sizeof(__u64); | |
2781 | ||
2782 | return 0; | |
2783 | } | |
2784 | ||
1e270976 MKL |
2785 | static int bpf_prog_get_info_by_fd(struct bpf_prog *prog, |
2786 | const union bpf_attr *attr, | |
2787 | union bpf_attr __user *uattr) | |
2788 | { | |
2789 | struct bpf_prog_info __user *uinfo = u64_to_user_ptr(attr->info.info); | |
2790 | struct bpf_prog_info info = {}; | |
2791 | u32 info_len = attr->info.info_len; | |
5f8f8b93 | 2792 | struct bpf_prog_stats stats; |
1e270976 MKL |
2793 | char __user *uinsns; |
2794 | u32 ulen; | |
2795 | int err; | |
2796 | ||
dcab51f1 | 2797 | err = bpf_check_uarg_tail_zero(uinfo, sizeof(info), info_len); |
1e270976 MKL |
2798 | if (err) |
2799 | return err; | |
2800 | info_len = min_t(u32, sizeof(info), info_len); | |
2801 | ||
2802 | if (copy_from_user(&info, uinfo, info_len)) | |
89b09689 | 2803 | return -EFAULT; |
1e270976 MKL |
2804 | |
2805 | info.type = prog->type; | |
2806 | info.id = prog->aux->id; | |
cb4d2b3f MKL |
2807 | info.load_time = prog->aux->load_time; |
2808 | info.created_by_uid = from_kuid_munged(current_user_ns(), | |
2809 | prog->aux->user->uid); | |
b85fab0e | 2810 | info.gpl_compatible = prog->gpl_compatible; |
1e270976 MKL |
2811 | |
2812 | memcpy(info.tag, prog->tag, sizeof(prog->tag)); | |
cb4d2b3f MKL |
2813 | memcpy(info.name, prog->aux->name, sizeof(prog->aux->name)); |
2814 | ||
2815 | ulen = info.nr_map_ids; | |
2816 | info.nr_map_ids = prog->aux->used_map_cnt; | |
2817 | ulen = min_t(u32, info.nr_map_ids, ulen); | |
2818 | if (ulen) { | |
721e08da | 2819 | u32 __user *user_map_ids = u64_to_user_ptr(info.map_ids); |
cb4d2b3f MKL |
2820 | u32 i; |
2821 | ||
2822 | for (i = 0; i < ulen; i++) | |
2823 | if (put_user(prog->aux->used_maps[i]->id, | |
2824 | &user_map_ids[i])) | |
2825 | return -EFAULT; | |
2826 | } | |
1e270976 | 2827 | |
c454a46b MKL |
2828 | err = set_info_rec_size(&info); |
2829 | if (err) | |
2830 | return err; | |
7337224f | 2831 | |
5f8f8b93 AS |
2832 | bpf_prog_get_stats(prog, &stats); |
2833 | info.run_time_ns = stats.nsecs; | |
2834 | info.run_cnt = stats.cnt; | |
2835 | ||
1e270976 MKL |
2836 | if (!capable(CAP_SYS_ADMIN)) { |
2837 | info.jited_prog_len = 0; | |
2838 | info.xlated_prog_len = 0; | |
dbecd738 | 2839 | info.nr_jited_ksyms = 0; |
28c2fae7 | 2840 | info.nr_jited_func_lens = 0; |
11d8b82d YS |
2841 | info.nr_func_info = 0; |
2842 | info.nr_line_info = 0; | |
2843 | info.nr_jited_line_info = 0; | |
1e270976 MKL |
2844 | goto done; |
2845 | } | |
2846 | ||
1e270976 | 2847 | ulen = info.xlated_prog_len; |
9975a54b | 2848 | info.xlated_prog_len = bpf_prog_insn_size(prog); |
1e270976 | 2849 | if (info.xlated_prog_len && ulen) { |
7105e828 DB |
2850 | struct bpf_insn *insns_sanitized; |
2851 | bool fault; | |
2852 | ||
2853 | if (prog->blinded && !bpf_dump_raw_ok()) { | |
2854 | info.xlated_prog_insns = 0; | |
2855 | goto done; | |
2856 | } | |
2857 | insns_sanitized = bpf_insn_prepare_dump(prog); | |
2858 | if (!insns_sanitized) | |
2859 | return -ENOMEM; | |
1e270976 MKL |
2860 | uinsns = u64_to_user_ptr(info.xlated_prog_insns); |
2861 | ulen = min_t(u32, info.xlated_prog_len, ulen); | |
7105e828 DB |
2862 | fault = copy_to_user(uinsns, insns_sanitized, ulen); |
2863 | kfree(insns_sanitized); | |
2864 | if (fault) | |
1e270976 MKL |
2865 | return -EFAULT; |
2866 | } | |
2867 | ||
675fc275 JK |
2868 | if (bpf_prog_is_dev_bound(prog->aux)) { |
2869 | err = bpf_prog_offload_info_fill(&info, prog); | |
2870 | if (err) | |
2871 | return err; | |
fcfb126d JW |
2872 | goto done; |
2873 | } | |
2874 | ||
2875 | /* NOTE: the following code is supposed to be skipped for offload. | |
2876 | * bpf_prog_offload_info_fill() is the place to fill similar fields | |
2877 | * for offload. | |
2878 | */ | |
2879 | ulen = info.jited_prog_len; | |
4d56a76e SD |
2880 | if (prog->aux->func_cnt) { |
2881 | u32 i; | |
2882 | ||
2883 | info.jited_prog_len = 0; | |
2884 | for (i = 0; i < prog->aux->func_cnt; i++) | |
2885 | info.jited_prog_len += prog->aux->func[i]->jited_len; | |
2886 | } else { | |
2887 | info.jited_prog_len = prog->jited_len; | |
2888 | } | |
2889 | ||
fcfb126d JW |
2890 | if (info.jited_prog_len && ulen) { |
2891 | if (bpf_dump_raw_ok()) { | |
2892 | uinsns = u64_to_user_ptr(info.jited_prog_insns); | |
2893 | ulen = min_t(u32, info.jited_prog_len, ulen); | |
4d56a76e SD |
2894 | |
2895 | /* for multi-function programs, copy the JITed | |
2896 | * instructions for all the functions | |
2897 | */ | |
2898 | if (prog->aux->func_cnt) { | |
2899 | u32 len, free, i; | |
2900 | u8 *img; | |
2901 | ||
2902 | free = ulen; | |
2903 | for (i = 0; i < prog->aux->func_cnt; i++) { | |
2904 | len = prog->aux->func[i]->jited_len; | |
2905 | len = min_t(u32, len, free); | |
2906 | img = (u8 *) prog->aux->func[i]->bpf_func; | |
2907 | if (copy_to_user(uinsns, img, len)) | |
2908 | return -EFAULT; | |
2909 | uinsns += len; | |
2910 | free -= len; | |
2911 | if (!free) | |
2912 | break; | |
2913 | } | |
2914 | } else { | |
2915 | if (copy_to_user(uinsns, prog->bpf_func, ulen)) | |
2916 | return -EFAULT; | |
2917 | } | |
fcfb126d JW |
2918 | } else { |
2919 | info.jited_prog_insns = 0; | |
2920 | } | |
675fc275 JK |
2921 | } |
2922 | ||
dbecd738 | 2923 | ulen = info.nr_jited_ksyms; |
ff1889fc | 2924 | info.nr_jited_ksyms = prog->aux->func_cnt ? : 1; |
7a5725dd | 2925 | if (ulen) { |
dbecd738 | 2926 | if (bpf_dump_raw_ok()) { |
ff1889fc | 2927 | unsigned long ksym_addr; |
dbecd738 | 2928 | u64 __user *user_ksyms; |
dbecd738 SD |
2929 | u32 i; |
2930 | ||
2931 | /* copy the address of the kernel symbol | |
2932 | * corresponding to each function | |
2933 | */ | |
2934 | ulen = min_t(u32, info.nr_jited_ksyms, ulen); | |
2935 | user_ksyms = u64_to_user_ptr(info.jited_ksyms); | |
ff1889fc SL |
2936 | if (prog->aux->func_cnt) { |
2937 | for (i = 0; i < ulen; i++) { | |
2938 | ksym_addr = (unsigned long) | |
2939 | prog->aux->func[i]->bpf_func; | |
2940 | if (put_user((u64) ksym_addr, | |
2941 | &user_ksyms[i])) | |
2942 | return -EFAULT; | |
2943 | } | |
2944 | } else { | |
2945 | ksym_addr = (unsigned long) prog->bpf_func; | |
2946 | if (put_user((u64) ksym_addr, &user_ksyms[0])) | |
dbecd738 SD |
2947 | return -EFAULT; |
2948 | } | |
2949 | } else { | |
2950 | info.jited_ksyms = 0; | |
2951 | } | |
2952 | } | |
2953 | ||
815581c1 | 2954 | ulen = info.nr_jited_func_lens; |
ff1889fc | 2955 | info.nr_jited_func_lens = prog->aux->func_cnt ? : 1; |
7a5725dd | 2956 | if (ulen) { |
815581c1 SD |
2957 | if (bpf_dump_raw_ok()) { |
2958 | u32 __user *user_lens; | |
2959 | u32 func_len, i; | |
2960 | ||
2961 | /* copy the JITed image lengths for each function */ | |
2962 | ulen = min_t(u32, info.nr_jited_func_lens, ulen); | |
2963 | user_lens = u64_to_user_ptr(info.jited_func_lens); | |
ff1889fc SL |
2964 | if (prog->aux->func_cnt) { |
2965 | for (i = 0; i < ulen; i++) { | |
2966 | func_len = | |
2967 | prog->aux->func[i]->jited_len; | |
2968 | if (put_user(func_len, &user_lens[i])) | |
2969 | return -EFAULT; | |
2970 | } | |
2971 | } else { | |
2972 | func_len = prog->jited_len; | |
2973 | if (put_user(func_len, &user_lens[0])) | |
815581c1 SD |
2974 | return -EFAULT; |
2975 | } | |
2976 | } else { | |
2977 | info.jited_func_lens = 0; | |
2978 | } | |
2979 | } | |
2980 | ||
7337224f | 2981 | if (prog->aux->btf) |
838e9690 YS |
2982 | info.btf_id = btf_id(prog->aux->btf); |
2983 | ||
11d8b82d YS |
2984 | ulen = info.nr_func_info; |
2985 | info.nr_func_info = prog->aux->func_info_cnt; | |
2986 | if (info.nr_func_info && ulen) { | |
9e794163 | 2987 | char __user *user_finfo; |
7337224f | 2988 | |
9e794163 MKL |
2989 | user_finfo = u64_to_user_ptr(info.func_info); |
2990 | ulen = min_t(u32, info.nr_func_info, ulen); | |
2991 | if (copy_to_user(user_finfo, prog->aux->func_info, | |
2992 | info.func_info_rec_size * ulen)) | |
2993 | return -EFAULT; | |
838e9690 YS |
2994 | } |
2995 | ||
11d8b82d YS |
2996 | ulen = info.nr_line_info; |
2997 | info.nr_line_info = prog->aux->nr_linfo; | |
2998 | if (info.nr_line_info && ulen) { | |
9e794163 | 2999 | __u8 __user *user_linfo; |
c454a46b | 3000 | |
9e794163 MKL |
3001 | user_linfo = u64_to_user_ptr(info.line_info); |
3002 | ulen = min_t(u32, info.nr_line_info, ulen); | |
3003 | if (copy_to_user(user_linfo, prog->aux->linfo, | |
3004 | info.line_info_rec_size * ulen)) | |
3005 | return -EFAULT; | |
c454a46b MKL |
3006 | } |
3007 | ||
11d8b82d | 3008 | ulen = info.nr_jited_line_info; |
c454a46b | 3009 | if (prog->aux->jited_linfo) |
11d8b82d | 3010 | info.nr_jited_line_info = prog->aux->nr_linfo; |
c454a46b | 3011 | else |
11d8b82d YS |
3012 | info.nr_jited_line_info = 0; |
3013 | if (info.nr_jited_line_info && ulen) { | |
c454a46b MKL |
3014 | if (bpf_dump_raw_ok()) { |
3015 | __u64 __user *user_linfo; | |
3016 | u32 i; | |
3017 | ||
3018 | user_linfo = u64_to_user_ptr(info.jited_line_info); | |
11d8b82d | 3019 | ulen = min_t(u32, info.nr_jited_line_info, ulen); |
c454a46b MKL |
3020 | for (i = 0; i < ulen; i++) { |
3021 | if (put_user((__u64)(long)prog->aux->jited_linfo[i], | |
3022 | &user_linfo[i])) | |
3023 | return -EFAULT; | |
3024 | } | |
3025 | } else { | |
3026 | info.jited_line_info = 0; | |
3027 | } | |
3028 | } | |
3029 | ||
c872bdb3 SL |
3030 | ulen = info.nr_prog_tags; |
3031 | info.nr_prog_tags = prog->aux->func_cnt ? : 1; | |
3032 | if (ulen) { | |
3033 | __u8 __user (*user_prog_tags)[BPF_TAG_SIZE]; | |
3034 | u32 i; | |
3035 | ||
3036 | user_prog_tags = u64_to_user_ptr(info.prog_tags); | |
3037 | ulen = min_t(u32, info.nr_prog_tags, ulen); | |
3038 | if (prog->aux->func_cnt) { | |
3039 | for (i = 0; i < ulen; i++) { | |
3040 | if (copy_to_user(user_prog_tags[i], | |
3041 | prog->aux->func[i]->tag, | |
3042 | BPF_TAG_SIZE)) | |
3043 | return -EFAULT; | |
3044 | } | |
3045 | } else { | |
3046 | if (copy_to_user(user_prog_tags[0], | |
3047 | prog->tag, BPF_TAG_SIZE)) | |
3048 | return -EFAULT; | |
3049 | } | |
3050 | } | |
3051 | ||
1e270976 MKL |
3052 | done: |
3053 | if (copy_to_user(uinfo, &info, info_len) || | |
3054 | put_user(info_len, &uattr->info.info_len)) | |
3055 | return -EFAULT; | |
3056 | ||
3057 | return 0; | |
3058 | } | |
3059 | ||
3060 | static int bpf_map_get_info_by_fd(struct bpf_map *map, | |
3061 | const union bpf_attr *attr, | |
3062 | union bpf_attr __user *uattr) | |
3063 | { | |
3064 | struct bpf_map_info __user *uinfo = u64_to_user_ptr(attr->info.info); | |
3065 | struct bpf_map_info info = {}; | |
3066 | u32 info_len = attr->info.info_len; | |
3067 | int err; | |
3068 | ||
dcab51f1 | 3069 | err = bpf_check_uarg_tail_zero(uinfo, sizeof(info), info_len); |
1e270976 MKL |
3070 | if (err) |
3071 | return err; | |
3072 | info_len = min_t(u32, sizeof(info), info_len); | |
3073 | ||
3074 | info.type = map->map_type; | |
3075 | info.id = map->id; | |
3076 | info.key_size = map->key_size; | |
3077 | info.value_size = map->value_size; | |
3078 | info.max_entries = map->max_entries; | |
3079 | info.map_flags = map->map_flags; | |
ad5b177b | 3080 | memcpy(info.name, map->name, sizeof(map->name)); |
1e270976 | 3081 | |
78958fca MKL |
3082 | if (map->btf) { |
3083 | info.btf_id = btf_id(map->btf); | |
9b2cf328 MKL |
3084 | info.btf_key_type_id = map->btf_key_type_id; |
3085 | info.btf_value_type_id = map->btf_value_type_id; | |
78958fca | 3086 | } |
85d33df3 | 3087 | info.btf_vmlinux_value_type_id = map->btf_vmlinux_value_type_id; |
78958fca | 3088 | |
52775b33 JK |
3089 | if (bpf_map_is_dev_bound(map)) { |
3090 | err = bpf_map_offload_info_fill(&info, map); | |
3091 | if (err) | |
3092 | return err; | |
3093 | } | |
3094 | ||
1e270976 MKL |
3095 | if (copy_to_user(uinfo, &info, info_len) || |
3096 | put_user(info_len, &uattr->info.info_len)) | |
3097 | return -EFAULT; | |
3098 | ||
3099 | return 0; | |
3100 | } | |
3101 | ||
62dab84c MKL |
3102 | static int bpf_btf_get_info_by_fd(struct btf *btf, |
3103 | const union bpf_attr *attr, | |
3104 | union bpf_attr __user *uattr) | |
3105 | { | |
3106 | struct bpf_btf_info __user *uinfo = u64_to_user_ptr(attr->info.info); | |
3107 | u32 info_len = attr->info.info_len; | |
3108 | int err; | |
3109 | ||
dcab51f1 | 3110 | err = bpf_check_uarg_tail_zero(uinfo, sizeof(*uinfo), info_len); |
62dab84c MKL |
3111 | if (err) |
3112 | return err; | |
3113 | ||
3114 | return btf_get_info_by_fd(btf, attr, uattr); | |
3115 | } | |
3116 | ||
1e270976 MKL |
3117 | #define BPF_OBJ_GET_INFO_BY_FD_LAST_FIELD info.info |
3118 | ||
3119 | static int bpf_obj_get_info_by_fd(const union bpf_attr *attr, | |
3120 | union bpf_attr __user *uattr) | |
3121 | { | |
3122 | int ufd = attr->info.bpf_fd; | |
3123 | struct fd f; | |
3124 | int err; | |
3125 | ||
3126 | if (CHECK_ATTR(BPF_OBJ_GET_INFO_BY_FD)) | |
3127 | return -EINVAL; | |
3128 | ||
3129 | f = fdget(ufd); | |
3130 | if (!f.file) | |
3131 | return -EBADFD; | |
3132 | ||
3133 | if (f.file->f_op == &bpf_prog_fops) | |
3134 | err = bpf_prog_get_info_by_fd(f.file->private_data, attr, | |
3135 | uattr); | |
3136 | else if (f.file->f_op == &bpf_map_fops) | |
3137 | err = bpf_map_get_info_by_fd(f.file->private_data, attr, | |
3138 | uattr); | |
60197cfb | 3139 | else if (f.file->f_op == &btf_fops) |
62dab84c | 3140 | err = bpf_btf_get_info_by_fd(f.file->private_data, attr, uattr); |
1e270976 MKL |
3141 | else |
3142 | err = -EINVAL; | |
3143 | ||
3144 | fdput(f); | |
3145 | return err; | |
3146 | } | |
3147 | ||
f56a653c MKL |
3148 | #define BPF_BTF_LOAD_LAST_FIELD btf_log_level |
3149 | ||
3150 | static int bpf_btf_load(const union bpf_attr *attr) | |
3151 | { | |
3152 | if (CHECK_ATTR(BPF_BTF_LOAD)) | |
3153 | return -EINVAL; | |
3154 | ||
3155 | if (!capable(CAP_SYS_ADMIN)) | |
3156 | return -EPERM; | |
3157 | ||
3158 | return btf_new_fd(attr); | |
3159 | } | |
3160 | ||
78958fca MKL |
3161 | #define BPF_BTF_GET_FD_BY_ID_LAST_FIELD btf_id |
3162 | ||
3163 | static int bpf_btf_get_fd_by_id(const union bpf_attr *attr) | |
3164 | { | |
3165 | if (CHECK_ATTR(BPF_BTF_GET_FD_BY_ID)) | |
3166 | return -EINVAL; | |
3167 | ||
3168 | if (!capable(CAP_SYS_ADMIN)) | |
3169 | return -EPERM; | |
3170 | ||
3171 | return btf_get_fd_by_id(attr->btf_id); | |
3172 | } | |
3173 | ||
41bdc4b4 YS |
3174 | static int bpf_task_fd_query_copy(const union bpf_attr *attr, |
3175 | union bpf_attr __user *uattr, | |
3176 | u32 prog_id, u32 fd_type, | |
3177 | const char *buf, u64 probe_offset, | |
3178 | u64 probe_addr) | |
3179 | { | |
3180 | char __user *ubuf = u64_to_user_ptr(attr->task_fd_query.buf); | |
3181 | u32 len = buf ? strlen(buf) : 0, input_len; | |
3182 | int err = 0; | |
3183 | ||
3184 | if (put_user(len, &uattr->task_fd_query.buf_len)) | |
3185 | return -EFAULT; | |
3186 | input_len = attr->task_fd_query.buf_len; | |
3187 | if (input_len && ubuf) { | |
3188 | if (!len) { | |
3189 | /* nothing to copy, just make ubuf NULL terminated */ | |
3190 | char zero = '\0'; | |
3191 | ||
3192 | if (put_user(zero, ubuf)) | |
3193 | return -EFAULT; | |
3194 | } else if (input_len >= len + 1) { | |
3195 | /* ubuf can hold the string with NULL terminator */ | |
3196 | if (copy_to_user(ubuf, buf, len + 1)) | |
3197 | return -EFAULT; | |
3198 | } else { | |
3199 | /* ubuf cannot hold the string with NULL terminator, | |
3200 | * do a partial copy with NULL terminator. | |
3201 | */ | |
3202 | char zero = '\0'; | |
3203 | ||
3204 | err = -ENOSPC; | |
3205 | if (copy_to_user(ubuf, buf, input_len - 1)) | |
3206 | return -EFAULT; | |
3207 | if (put_user(zero, ubuf + input_len - 1)) | |
3208 | return -EFAULT; | |
3209 | } | |
3210 | } | |
3211 | ||
3212 | if (put_user(prog_id, &uattr->task_fd_query.prog_id) || | |
3213 | put_user(fd_type, &uattr->task_fd_query.fd_type) || | |
3214 | put_user(probe_offset, &uattr->task_fd_query.probe_offset) || | |
3215 | put_user(probe_addr, &uattr->task_fd_query.probe_addr)) | |
3216 | return -EFAULT; | |
3217 | ||
3218 | return err; | |
3219 | } | |
3220 | ||
3221 | #define BPF_TASK_FD_QUERY_LAST_FIELD task_fd_query.probe_addr | |
3222 | ||
3223 | static int bpf_task_fd_query(const union bpf_attr *attr, | |
3224 | union bpf_attr __user *uattr) | |
3225 | { | |
3226 | pid_t pid = attr->task_fd_query.pid; | |
3227 | u32 fd = attr->task_fd_query.fd; | |
3228 | const struct perf_event *event; | |
3229 | struct files_struct *files; | |
3230 | struct task_struct *task; | |
3231 | struct file *file; | |
3232 | int err; | |
3233 | ||
3234 | if (CHECK_ATTR(BPF_TASK_FD_QUERY)) | |
3235 | return -EINVAL; | |
3236 | ||
3237 | if (!capable(CAP_SYS_ADMIN)) | |
3238 | return -EPERM; | |
3239 | ||
3240 | if (attr->task_fd_query.flags != 0) | |
3241 | return -EINVAL; | |
3242 | ||
3243 | task = get_pid_task(find_vpid(pid), PIDTYPE_PID); | |
3244 | if (!task) | |
3245 | return -ENOENT; | |
3246 | ||
3247 | files = get_files_struct(task); | |
3248 | put_task_struct(task); | |
3249 | if (!files) | |
3250 | return -ENOENT; | |
3251 | ||
3252 | err = 0; | |
3253 | spin_lock(&files->file_lock); | |
3254 | file = fcheck_files(files, fd); | |
3255 | if (!file) | |
3256 | err = -EBADF; | |
3257 | else | |
3258 | get_file(file); | |
3259 | spin_unlock(&files->file_lock); | |
3260 | put_files_struct(files); | |
3261 | ||
3262 | if (err) | |
3263 | goto out; | |
3264 | ||
3265 | if (file->f_op == &bpf_raw_tp_fops) { | |
3266 | struct bpf_raw_tracepoint *raw_tp = file->private_data; | |
3267 | struct bpf_raw_event_map *btp = raw_tp->btp; | |
3268 | ||
3269 | err = bpf_task_fd_query_copy(attr, uattr, | |
3270 | raw_tp->prog->aux->id, | |
3271 | BPF_FD_TYPE_RAW_TRACEPOINT, | |
3272 | btp->tp->name, 0, 0); | |
3273 | goto put_file; | |
3274 | } | |
3275 | ||
3276 | event = perf_get_event(file); | |
3277 | if (!IS_ERR(event)) { | |
3278 | u64 probe_offset, probe_addr; | |
3279 | u32 prog_id, fd_type; | |
3280 | const char *buf; | |
3281 | ||
3282 | err = bpf_get_perf_event_info(event, &prog_id, &fd_type, | |
3283 | &buf, &probe_offset, | |
3284 | &probe_addr); | |
3285 | if (!err) | |
3286 | err = bpf_task_fd_query_copy(attr, uattr, prog_id, | |
3287 | fd_type, buf, | |
3288 | probe_offset, | |
3289 | probe_addr); | |
3290 | goto put_file; | |
3291 | } | |
3292 | ||
3293 | err = -ENOTSUPP; | |
3294 | put_file: | |
3295 | fput(file); | |
3296 | out: | |
3297 | return err; | |
3298 | } | |
3299 | ||
cb4d03ab BV |
3300 | #define BPF_MAP_BATCH_LAST_FIELD batch.flags |
3301 | ||
3302 | #define BPF_DO_BATCH(fn) \ | |
3303 | do { \ | |
3304 | if (!fn) { \ | |
3305 | err = -ENOTSUPP; \ | |
3306 | goto err_put; \ | |
3307 | } \ | |
3308 | err = fn(map, attr, uattr); \ | |
3309 | } while (0) | |
3310 | ||
3311 | static int bpf_map_do_batch(const union bpf_attr *attr, | |
3312 | union bpf_attr __user *uattr, | |
3313 | int cmd) | |
3314 | { | |
3315 | struct bpf_map *map; | |
3316 | int err, ufd; | |
3317 | struct fd f; | |
3318 | ||
3319 | if (CHECK_ATTR(BPF_MAP_BATCH)) | |
3320 | return -EINVAL; | |
3321 | ||
3322 | ufd = attr->batch.map_fd; | |
3323 | f = fdget(ufd); | |
3324 | map = __bpf_map_get(f); | |
3325 | if (IS_ERR(map)) | |
3326 | return PTR_ERR(map); | |
3327 | ||
05799638 YS |
3328 | if ((cmd == BPF_MAP_LOOKUP_BATCH || |
3329 | cmd == BPF_MAP_LOOKUP_AND_DELETE_BATCH) && | |
cb4d03ab BV |
3330 | !(map_get_sys_perms(map, f) & FMODE_CAN_READ)) { |
3331 | err = -EPERM; | |
3332 | goto err_put; | |
3333 | } | |
3334 | ||
3335 | if (cmd != BPF_MAP_LOOKUP_BATCH && | |
3336 | !(map_get_sys_perms(map, f) & FMODE_CAN_WRITE)) { | |
3337 | err = -EPERM; | |
3338 | goto err_put; | |
3339 | } | |
3340 | ||
3341 | if (cmd == BPF_MAP_LOOKUP_BATCH) | |
3342 | BPF_DO_BATCH(map->ops->map_lookup_batch); | |
05799638 YS |
3343 | else if (cmd == BPF_MAP_LOOKUP_AND_DELETE_BATCH) |
3344 | BPF_DO_BATCH(map->ops->map_lookup_and_delete_batch); | |
aa2e93b8 BV |
3345 | else if (cmd == BPF_MAP_UPDATE_BATCH) |
3346 | BPF_DO_BATCH(map->ops->map_update_batch); | |
3347 | else | |
3348 | BPF_DO_BATCH(map->ops->map_delete_batch); | |
cb4d03ab BV |
3349 | |
3350 | err_put: | |
3351 | fdput(f); | |
3352 | return err; | |
3353 | } | |
3354 | ||
99c55f7d AS |
3355 | SYSCALL_DEFINE3(bpf, int, cmd, union bpf_attr __user *, uattr, unsigned int, size) |
3356 | { | |
3357 | union bpf_attr attr = {}; | |
3358 | int err; | |
3359 | ||
0fa4fe85 | 3360 | if (sysctl_unprivileged_bpf_disabled && !capable(CAP_SYS_ADMIN)) |
99c55f7d AS |
3361 | return -EPERM; |
3362 | ||
dcab51f1 | 3363 | err = bpf_check_uarg_tail_zero(uattr, sizeof(attr), size); |
1e270976 MKL |
3364 | if (err) |
3365 | return err; | |
3366 | size = min_t(u32, size, sizeof(attr)); | |
99c55f7d AS |
3367 | |
3368 | /* copy attributes from user space, may be less than sizeof(bpf_attr) */ | |
3369 | if (copy_from_user(&attr, uattr, size) != 0) | |
3370 | return -EFAULT; | |
3371 | ||
afdb09c7 CF |
3372 | err = security_bpf(cmd, &attr, size); |
3373 | if (err < 0) | |
3374 | return err; | |
3375 | ||
99c55f7d AS |
3376 | switch (cmd) { |
3377 | case BPF_MAP_CREATE: | |
3378 | err = map_create(&attr); | |
3379 | break; | |
db20fd2b AS |
3380 | case BPF_MAP_LOOKUP_ELEM: |
3381 | err = map_lookup_elem(&attr); | |
3382 | break; | |
3383 | case BPF_MAP_UPDATE_ELEM: | |
3384 | err = map_update_elem(&attr); | |
3385 | break; | |
3386 | case BPF_MAP_DELETE_ELEM: | |
3387 | err = map_delete_elem(&attr); | |
3388 | break; | |
3389 | case BPF_MAP_GET_NEXT_KEY: | |
3390 | err = map_get_next_key(&attr); | |
3391 | break; | |
87df15de DB |
3392 | case BPF_MAP_FREEZE: |
3393 | err = map_freeze(&attr); | |
3394 | break; | |
09756af4 | 3395 | case BPF_PROG_LOAD: |
838e9690 | 3396 | err = bpf_prog_load(&attr, uattr); |
09756af4 | 3397 | break; |
b2197755 DB |
3398 | case BPF_OBJ_PIN: |
3399 | err = bpf_obj_pin(&attr); | |
3400 | break; | |
3401 | case BPF_OBJ_GET: | |
3402 | err = bpf_obj_get(&attr); | |
3403 | break; | |
f4324551 DM |
3404 | case BPF_PROG_ATTACH: |
3405 | err = bpf_prog_attach(&attr); | |
3406 | break; | |
3407 | case BPF_PROG_DETACH: | |
3408 | err = bpf_prog_detach(&attr); | |
3409 | break; | |
468e2f64 AS |
3410 | case BPF_PROG_QUERY: |
3411 | err = bpf_prog_query(&attr, uattr); | |
3412 | break; | |
1cf1cae9 AS |
3413 | case BPF_PROG_TEST_RUN: |
3414 | err = bpf_prog_test_run(&attr, uattr); | |
3415 | break; | |
34ad5580 MKL |
3416 | case BPF_PROG_GET_NEXT_ID: |
3417 | err = bpf_obj_get_next_id(&attr, uattr, | |
3418 | &prog_idr, &prog_idr_lock); | |
3419 | break; | |
3420 | case BPF_MAP_GET_NEXT_ID: | |
3421 | err = bpf_obj_get_next_id(&attr, uattr, | |
3422 | &map_idr, &map_idr_lock); | |
3423 | break; | |
1b9ed84e QM |
3424 | case BPF_BTF_GET_NEXT_ID: |
3425 | err = bpf_obj_get_next_id(&attr, uattr, | |
3426 | &btf_idr, &btf_idr_lock); | |
3427 | break; | |
b16d9aa4 MKL |
3428 | case BPF_PROG_GET_FD_BY_ID: |
3429 | err = bpf_prog_get_fd_by_id(&attr); | |
3430 | break; | |
bd5f5f4e MKL |
3431 | case BPF_MAP_GET_FD_BY_ID: |
3432 | err = bpf_map_get_fd_by_id(&attr); | |
3433 | break; | |
1e270976 MKL |
3434 | case BPF_OBJ_GET_INFO_BY_FD: |
3435 | err = bpf_obj_get_info_by_fd(&attr, uattr); | |
3436 | break; | |
c4f6699d AS |
3437 | case BPF_RAW_TRACEPOINT_OPEN: |
3438 | err = bpf_raw_tracepoint_open(&attr); | |
3439 | break; | |
f56a653c MKL |
3440 | case BPF_BTF_LOAD: |
3441 | err = bpf_btf_load(&attr); | |
3442 | break; | |
78958fca MKL |
3443 | case BPF_BTF_GET_FD_BY_ID: |
3444 | err = bpf_btf_get_fd_by_id(&attr); | |
3445 | break; | |
41bdc4b4 YS |
3446 | case BPF_TASK_FD_QUERY: |
3447 | err = bpf_task_fd_query(&attr, uattr); | |
3448 | break; | |
bd513cd0 MV |
3449 | case BPF_MAP_LOOKUP_AND_DELETE_ELEM: |
3450 | err = map_lookup_and_delete_elem(&attr); | |
3451 | break; | |
cb4d03ab BV |
3452 | case BPF_MAP_LOOKUP_BATCH: |
3453 | err = bpf_map_do_batch(&attr, uattr, BPF_MAP_LOOKUP_BATCH); | |
3454 | break; | |
05799638 YS |
3455 | case BPF_MAP_LOOKUP_AND_DELETE_BATCH: |
3456 | err = bpf_map_do_batch(&attr, uattr, | |
3457 | BPF_MAP_LOOKUP_AND_DELETE_BATCH); | |
3458 | break; | |
aa2e93b8 BV |
3459 | case BPF_MAP_UPDATE_BATCH: |
3460 | err = bpf_map_do_batch(&attr, uattr, BPF_MAP_UPDATE_BATCH); | |
3461 | break; | |
3462 | case BPF_MAP_DELETE_BATCH: | |
3463 | err = bpf_map_do_batch(&attr, uattr, BPF_MAP_DELETE_BATCH); | |
3464 | break; | |
99c55f7d AS |
3465 | default: |
3466 | err = -EINVAL; | |
3467 | break; | |
3468 | } | |
3469 | ||
3470 | return err; | |
3471 | } |