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de9cbbaa RG |
1 | //SPDX-License-Identifier: GPL-2.0 |
2 | #include <linux/bpf-cgroup.h> | |
3 | #include <linux/bpf.h> | |
9a1126b6 | 4 | #include <linux/btf.h> |
de9cbbaa RG |
5 | #include <linux/bug.h> |
6 | #include <linux/filter.h> | |
7 | #include <linux/mm.h> | |
8 | #include <linux/rbtree.h> | |
9 | #include <linux/slab.h> | |
9a1126b6 | 10 | #include <uapi/linux/btf.h> |
de9cbbaa | 11 | |
cf0dd411 | 12 | DEFINE_PER_CPU(struct bpf_cgroup_storage*, bpf_cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE]); |
aa0ad5b0 | 13 | |
de9cbbaa RG |
14 | #ifdef CONFIG_CGROUP_BPF |
15 | ||
16 | #define LOCAL_STORAGE_CREATE_FLAG_MASK \ | |
591fe988 | 17 | (BPF_F_NUMA_NODE | BPF_F_ACCESS_MASK) |
de9cbbaa RG |
18 | |
19 | struct bpf_cgroup_storage_map { | |
20 | struct bpf_map map; | |
21 | ||
22 | spinlock_t lock; | |
e4730423 | 23 | struct bpf_prog_aux *aux; |
de9cbbaa RG |
24 | struct rb_root root; |
25 | struct list_head list; | |
26 | }; | |
27 | ||
28 | static struct bpf_cgroup_storage_map *map_to_storage(struct bpf_map *map) | |
29 | { | |
30 | return container_of(map, struct bpf_cgroup_storage_map, map); | |
31 | } | |
32 | ||
33 | static int bpf_cgroup_storage_key_cmp( | |
34 | const struct bpf_cgroup_storage_key *key1, | |
35 | const struct bpf_cgroup_storage_key *key2) | |
36 | { | |
37 | if (key1->cgroup_inode_id < key2->cgroup_inode_id) | |
38 | return -1; | |
39 | else if (key1->cgroup_inode_id > key2->cgroup_inode_id) | |
40 | return 1; | |
41 | else if (key1->attach_type < key2->attach_type) | |
42 | return -1; | |
43 | else if (key1->attach_type > key2->attach_type) | |
44 | return 1; | |
45 | return 0; | |
46 | } | |
47 | ||
48 | static struct bpf_cgroup_storage *cgroup_storage_lookup( | |
49 | struct bpf_cgroup_storage_map *map, struct bpf_cgroup_storage_key *key, | |
50 | bool locked) | |
51 | { | |
52 | struct rb_root *root = &map->root; | |
53 | struct rb_node *node; | |
54 | ||
55 | if (!locked) | |
56 | spin_lock_bh(&map->lock); | |
57 | ||
58 | node = root->rb_node; | |
59 | while (node) { | |
60 | struct bpf_cgroup_storage *storage; | |
61 | ||
62 | storage = container_of(node, struct bpf_cgroup_storage, node); | |
63 | ||
64 | switch (bpf_cgroup_storage_key_cmp(key, &storage->key)) { | |
65 | case -1: | |
66 | node = node->rb_left; | |
67 | break; | |
68 | case 1: | |
69 | node = node->rb_right; | |
70 | break; | |
71 | default: | |
72 | if (!locked) | |
73 | spin_unlock_bh(&map->lock); | |
74 | return storage; | |
75 | } | |
76 | } | |
77 | ||
78 | if (!locked) | |
79 | spin_unlock_bh(&map->lock); | |
80 | ||
81 | return NULL; | |
82 | } | |
83 | ||
84 | static int cgroup_storage_insert(struct bpf_cgroup_storage_map *map, | |
85 | struct bpf_cgroup_storage *storage) | |
86 | { | |
87 | struct rb_root *root = &map->root; | |
88 | struct rb_node **new = &(root->rb_node), *parent = NULL; | |
89 | ||
90 | while (*new) { | |
91 | struct bpf_cgroup_storage *this; | |
92 | ||
93 | this = container_of(*new, struct bpf_cgroup_storage, node); | |
94 | ||
95 | parent = *new; | |
96 | switch (bpf_cgroup_storage_key_cmp(&storage->key, &this->key)) { | |
97 | case -1: | |
98 | new = &((*new)->rb_left); | |
99 | break; | |
100 | case 1: | |
101 | new = &((*new)->rb_right); | |
102 | break; | |
103 | default: | |
104 | return -EEXIST; | |
105 | } | |
106 | } | |
107 | ||
108 | rb_link_node(&storage->node, parent, new); | |
109 | rb_insert_color(&storage->node, root); | |
110 | ||
111 | return 0; | |
112 | } | |
113 | ||
114 | static void *cgroup_storage_lookup_elem(struct bpf_map *_map, void *_key) | |
115 | { | |
116 | struct bpf_cgroup_storage_map *map = map_to_storage(_map); | |
117 | struct bpf_cgroup_storage_key *key = _key; | |
118 | struct bpf_cgroup_storage *storage; | |
119 | ||
120 | storage = cgroup_storage_lookup(map, key, false); | |
121 | if (!storage) | |
122 | return NULL; | |
123 | ||
124 | return &READ_ONCE(storage->buf)->data[0]; | |
125 | } | |
126 | ||
127 | static int cgroup_storage_update_elem(struct bpf_map *map, void *_key, | |
128 | void *value, u64 flags) | |
129 | { | |
130 | struct bpf_cgroup_storage_key *key = _key; | |
131 | struct bpf_cgroup_storage *storage; | |
132 | struct bpf_storage_buffer *new; | |
133 | ||
96049f3a AS |
134 | if (unlikely(flags & ~(BPF_F_LOCK | BPF_EXIST | BPF_NOEXIST))) |
135 | return -EINVAL; | |
136 | ||
137 | if (unlikely(flags & BPF_NOEXIST)) | |
138 | return -EINVAL; | |
139 | ||
140 | if (unlikely((flags & BPF_F_LOCK) && | |
141 | !map_value_has_spin_lock(map))) | |
de9cbbaa RG |
142 | return -EINVAL; |
143 | ||
144 | storage = cgroup_storage_lookup((struct bpf_cgroup_storage_map *)map, | |
145 | key, false); | |
146 | if (!storage) | |
147 | return -ENOENT; | |
148 | ||
96049f3a AS |
149 | if (flags & BPF_F_LOCK) { |
150 | copy_map_value_locked(map, storage->buf->data, value, false); | |
151 | return 0; | |
152 | } | |
153 | ||
de9cbbaa | 154 | new = kmalloc_node(sizeof(struct bpf_storage_buffer) + |
569a933b RG |
155 | map->value_size, |
156 | __GFP_ZERO | GFP_ATOMIC | __GFP_NOWARN, | |
de9cbbaa RG |
157 | map->numa_node); |
158 | if (!new) | |
159 | return -ENOMEM; | |
160 | ||
161 | memcpy(&new->data[0], value, map->value_size); | |
e16d2f1a | 162 | check_and_init_map_lock(map, new->data); |
de9cbbaa RG |
163 | |
164 | new = xchg(&storage->buf, new); | |
165 | kfree_rcu(new, rcu); | |
166 | ||
167 | return 0; | |
168 | } | |
169 | ||
b741f163 RG |
170 | int bpf_percpu_cgroup_storage_copy(struct bpf_map *_map, void *_key, |
171 | void *value) | |
172 | { | |
173 | struct bpf_cgroup_storage_map *map = map_to_storage(_map); | |
174 | struct bpf_cgroup_storage_key *key = _key; | |
175 | struct bpf_cgroup_storage *storage; | |
176 | int cpu, off = 0; | |
177 | u32 size; | |
178 | ||
179 | rcu_read_lock(); | |
180 | storage = cgroup_storage_lookup(map, key, false); | |
181 | if (!storage) { | |
182 | rcu_read_unlock(); | |
183 | return -ENOENT; | |
184 | } | |
185 | ||
186 | /* per_cpu areas are zero-filled and bpf programs can only | |
187 | * access 'value_size' of them, so copying rounded areas | |
188 | * will not leak any kernel data | |
189 | */ | |
190 | size = round_up(_map->value_size, 8); | |
191 | for_each_possible_cpu(cpu) { | |
192 | bpf_long_memcpy(value + off, | |
193 | per_cpu_ptr(storage->percpu_buf, cpu), size); | |
194 | off += size; | |
195 | } | |
196 | rcu_read_unlock(); | |
197 | return 0; | |
198 | } | |
199 | ||
200 | int bpf_percpu_cgroup_storage_update(struct bpf_map *_map, void *_key, | |
201 | void *value, u64 map_flags) | |
202 | { | |
203 | struct bpf_cgroup_storage_map *map = map_to_storage(_map); | |
204 | struct bpf_cgroup_storage_key *key = _key; | |
205 | struct bpf_cgroup_storage *storage; | |
206 | int cpu, off = 0; | |
207 | u32 size; | |
208 | ||
209 | if (map_flags != BPF_ANY && map_flags != BPF_EXIST) | |
210 | return -EINVAL; | |
211 | ||
212 | rcu_read_lock(); | |
213 | storage = cgroup_storage_lookup(map, key, false); | |
214 | if (!storage) { | |
215 | rcu_read_unlock(); | |
216 | return -ENOENT; | |
217 | } | |
218 | ||
219 | /* the user space will provide round_up(value_size, 8) bytes that | |
220 | * will be copied into per-cpu area. bpf programs can only access | |
221 | * value_size of it. During lookup the same extra bytes will be | |
222 | * returned or zeros which were zero-filled by percpu_alloc, | |
223 | * so no kernel data leaks possible | |
224 | */ | |
225 | size = round_up(_map->value_size, 8); | |
226 | for_each_possible_cpu(cpu) { | |
227 | bpf_long_memcpy(per_cpu_ptr(storage->percpu_buf, cpu), | |
228 | value + off, size); | |
229 | off += size; | |
230 | } | |
231 | rcu_read_unlock(); | |
232 | return 0; | |
233 | } | |
234 | ||
de9cbbaa RG |
235 | static int cgroup_storage_get_next_key(struct bpf_map *_map, void *_key, |
236 | void *_next_key) | |
237 | { | |
238 | struct bpf_cgroup_storage_map *map = map_to_storage(_map); | |
239 | struct bpf_cgroup_storage_key *key = _key; | |
240 | struct bpf_cgroup_storage_key *next = _next_key; | |
241 | struct bpf_cgroup_storage *storage; | |
242 | ||
243 | spin_lock_bh(&map->lock); | |
244 | ||
245 | if (list_empty(&map->list)) | |
246 | goto enoent; | |
247 | ||
248 | if (key) { | |
249 | storage = cgroup_storage_lookup(map, key, true); | |
250 | if (!storage) | |
251 | goto enoent; | |
252 | ||
253 | storage = list_next_entry(storage, list); | |
254 | if (!storage) | |
255 | goto enoent; | |
256 | } else { | |
257 | storage = list_first_entry(&map->list, | |
258 | struct bpf_cgroup_storage, list); | |
259 | } | |
260 | ||
261 | spin_unlock_bh(&map->lock); | |
262 | next->attach_type = storage->key.attach_type; | |
263 | next->cgroup_inode_id = storage->key.cgroup_inode_id; | |
264 | return 0; | |
265 | ||
266 | enoent: | |
267 | spin_unlock_bh(&map->lock); | |
268 | return -ENOENT; | |
269 | } | |
270 | ||
271 | static struct bpf_map *cgroup_storage_map_alloc(union bpf_attr *attr) | |
272 | { | |
273 | int numa_node = bpf_map_attr_numa_node(attr); | |
274 | struct bpf_cgroup_storage_map *map; | |
b936ca64 | 275 | struct bpf_map_memory mem; |
ffc8b144 | 276 | int ret; |
de9cbbaa RG |
277 | |
278 | if (attr->key_size != sizeof(struct bpf_cgroup_storage_key)) | |
279 | return ERR_PTR(-EINVAL); | |
280 | ||
b0584ea6 RG |
281 | if (attr->value_size == 0) |
282 | return ERR_PTR(-EINVAL); | |
283 | ||
de9cbbaa RG |
284 | if (attr->value_size > PAGE_SIZE) |
285 | return ERR_PTR(-E2BIG); | |
286 | ||
591fe988 DB |
287 | if (attr->map_flags & ~LOCAL_STORAGE_CREATE_FLAG_MASK || |
288 | !bpf_map_flags_access_ok(attr->map_flags)) | |
de9cbbaa RG |
289 | return ERR_PTR(-EINVAL); |
290 | ||
291 | if (attr->max_entries) | |
292 | /* max_entries is not used and enforced to be 0 */ | |
293 | return ERR_PTR(-EINVAL); | |
294 | ||
c85d6913 | 295 | ret = bpf_map_charge_init(&mem, sizeof(struct bpf_cgroup_storage_map)); |
ffc8b144 RG |
296 | if (ret < 0) |
297 | return ERR_PTR(ret); | |
298 | ||
de9cbbaa RG |
299 | map = kmalloc_node(sizeof(struct bpf_cgroup_storage_map), |
300 | __GFP_ZERO | GFP_USER, numa_node); | |
b936ca64 RG |
301 | if (!map) { |
302 | bpf_map_charge_finish(&mem); | |
de9cbbaa | 303 | return ERR_PTR(-ENOMEM); |
b936ca64 | 304 | } |
de9cbbaa | 305 | |
b936ca64 | 306 | bpf_map_charge_move(&map->map.memory, &mem); |
de9cbbaa RG |
307 | |
308 | /* copy mandatory map attributes */ | |
309 | bpf_map_init_from_attr(&map->map, attr); | |
310 | ||
311 | spin_lock_init(&map->lock); | |
312 | map->root = RB_ROOT; | |
313 | INIT_LIST_HEAD(&map->list); | |
314 | ||
315 | return &map->map; | |
316 | } | |
317 | ||
318 | static void cgroup_storage_map_free(struct bpf_map *_map) | |
319 | { | |
320 | struct bpf_cgroup_storage_map *map = map_to_storage(_map); | |
321 | ||
322 | WARN_ON(!RB_EMPTY_ROOT(&map->root)); | |
323 | WARN_ON(!list_empty(&map->list)); | |
324 | ||
325 | kfree(map); | |
326 | } | |
327 | ||
328 | static int cgroup_storage_delete_elem(struct bpf_map *map, void *key) | |
329 | { | |
330 | return -EINVAL; | |
331 | } | |
332 | ||
9a1126b6 RG |
333 | static int cgroup_storage_check_btf(const struct bpf_map *map, |
334 | const struct btf *btf, | |
335 | const struct btf_type *key_type, | |
336 | const struct btf_type *value_type) | |
337 | { | |
9a1126b6 | 338 | struct btf_member *m; |
ffa0c1cf | 339 | u32 offset, size; |
9a1126b6 RG |
340 | |
341 | /* Key is expected to be of struct bpf_cgroup_storage_key type, | |
342 | * which is: | |
343 | * struct bpf_cgroup_storage_key { | |
344 | * __u64 cgroup_inode_id; | |
345 | * __u32 attach_type; | |
346 | * }; | |
347 | */ | |
348 | ||
349 | /* | |
350 | * Key_type must be a structure with two fields. | |
351 | */ | |
352 | if (BTF_INFO_KIND(key_type->info) != BTF_KIND_STRUCT || | |
353 | BTF_INFO_VLEN(key_type->info) != 2) | |
354 | return -EINVAL; | |
355 | ||
356 | /* | |
357 | * The first field must be a 64 bit integer at 0 offset. | |
358 | */ | |
359 | m = (struct btf_member *)(key_type + 1); | |
c593642c | 360 | size = sizeof_field(struct bpf_cgroup_storage_key, cgroup_inode_id); |
ffa0c1cf | 361 | if (!btf_member_is_reg_int(btf, key_type, m, 0, size)) |
9a1126b6 RG |
362 | return -EINVAL; |
363 | ||
364 | /* | |
365 | * The second field must be a 32 bit integer at 64 bit offset. | |
366 | */ | |
367 | m++; | |
ffa0c1cf | 368 | offset = offsetof(struct bpf_cgroup_storage_key, attach_type); |
c593642c | 369 | size = sizeof_field(struct bpf_cgroup_storage_key, attach_type); |
ffa0c1cf | 370 | if (!btf_member_is_reg_int(btf, key_type, m, offset, size)) |
9a1126b6 RG |
371 | return -EINVAL; |
372 | ||
373 | return 0; | |
374 | } | |
375 | ||
376 | static void cgroup_storage_seq_show_elem(struct bpf_map *map, void *_key, | |
377 | struct seq_file *m) | |
378 | { | |
379 | enum bpf_cgroup_storage_type stype = cgroup_storage_type(map); | |
380 | struct bpf_cgroup_storage_key *key = _key; | |
381 | struct bpf_cgroup_storage *storage; | |
382 | int cpu; | |
383 | ||
384 | rcu_read_lock(); | |
385 | storage = cgroup_storage_lookup(map_to_storage(map), key, false); | |
386 | if (!storage) { | |
387 | rcu_read_unlock(); | |
388 | return; | |
389 | } | |
390 | ||
391 | btf_type_seq_show(map->btf, map->btf_key_type_id, key, m); | |
392 | stype = cgroup_storage_type(map); | |
393 | if (stype == BPF_CGROUP_STORAGE_SHARED) { | |
394 | seq_puts(m, ": "); | |
395 | btf_type_seq_show(map->btf, map->btf_value_type_id, | |
396 | &READ_ONCE(storage->buf)->data[0], m); | |
397 | seq_puts(m, "\n"); | |
398 | } else { | |
399 | seq_puts(m, ": {\n"); | |
400 | for_each_possible_cpu(cpu) { | |
401 | seq_printf(m, "\tcpu%d: ", cpu); | |
402 | btf_type_seq_show(map->btf, map->btf_value_type_id, | |
403 | per_cpu_ptr(storage->percpu_buf, cpu), | |
404 | m); | |
405 | seq_puts(m, "\n"); | |
406 | } | |
407 | seq_puts(m, "}\n"); | |
408 | } | |
409 | rcu_read_unlock(); | |
410 | } | |
411 | ||
de9cbbaa RG |
412 | const struct bpf_map_ops cgroup_storage_map_ops = { |
413 | .map_alloc = cgroup_storage_map_alloc, | |
414 | .map_free = cgroup_storage_map_free, | |
415 | .map_get_next_key = cgroup_storage_get_next_key, | |
416 | .map_lookup_elem = cgroup_storage_lookup_elem, | |
417 | .map_update_elem = cgroup_storage_update_elem, | |
418 | .map_delete_elem = cgroup_storage_delete_elem, | |
9a1126b6 RG |
419 | .map_check_btf = cgroup_storage_check_btf, |
420 | .map_seq_show_elem = cgroup_storage_seq_show_elem, | |
de9cbbaa RG |
421 | }; |
422 | ||
e4730423 | 423 | int bpf_cgroup_storage_assign(struct bpf_prog_aux *aux, struct bpf_map *_map) |
de9cbbaa | 424 | { |
8bad74f9 | 425 | enum bpf_cgroup_storage_type stype = cgroup_storage_type(_map); |
de9cbbaa RG |
426 | struct bpf_cgroup_storage_map *map = map_to_storage(_map); |
427 | int ret = -EBUSY; | |
428 | ||
429 | spin_lock_bh(&map->lock); | |
430 | ||
e4730423 | 431 | if (map->aux && map->aux != aux) |
de9cbbaa | 432 | goto unlock; |
e4730423 DB |
433 | if (aux->cgroup_storage[stype] && |
434 | aux->cgroup_storage[stype] != _map) | |
de9cbbaa RG |
435 | goto unlock; |
436 | ||
e4730423 DB |
437 | map->aux = aux; |
438 | aux->cgroup_storage[stype] = _map; | |
de9cbbaa RG |
439 | ret = 0; |
440 | unlock: | |
441 | spin_unlock_bh(&map->lock); | |
442 | ||
443 | return ret; | |
444 | } | |
445 | ||
e4730423 | 446 | void bpf_cgroup_storage_release(struct bpf_prog_aux *aux, struct bpf_map *_map) |
de9cbbaa | 447 | { |
8bad74f9 | 448 | enum bpf_cgroup_storage_type stype = cgroup_storage_type(_map); |
de9cbbaa RG |
449 | struct bpf_cgroup_storage_map *map = map_to_storage(_map); |
450 | ||
451 | spin_lock_bh(&map->lock); | |
e4730423 DB |
452 | if (map->aux == aux) { |
453 | WARN_ON(aux->cgroup_storage[stype] != _map); | |
454 | map->aux = NULL; | |
455 | aux->cgroup_storage[stype] = NULL; | |
de9cbbaa RG |
456 | } |
457 | spin_unlock_bh(&map->lock); | |
458 | } | |
459 | ||
b741f163 RG |
460 | static size_t bpf_cgroup_storage_calculate_size(struct bpf_map *map, u32 *pages) |
461 | { | |
462 | size_t size; | |
463 | ||
464 | if (cgroup_storage_type(map) == BPF_CGROUP_STORAGE_SHARED) { | |
465 | size = sizeof(struct bpf_storage_buffer) + map->value_size; | |
466 | *pages = round_up(sizeof(struct bpf_cgroup_storage) + size, | |
467 | PAGE_SIZE) >> PAGE_SHIFT; | |
468 | } else { | |
469 | size = map->value_size; | |
470 | *pages = round_up(round_up(size, 8) * num_possible_cpus(), | |
471 | PAGE_SIZE) >> PAGE_SHIFT; | |
472 | } | |
473 | ||
474 | return size; | |
475 | } | |
476 | ||
8bad74f9 RG |
477 | struct bpf_cgroup_storage *bpf_cgroup_storage_alloc(struct bpf_prog *prog, |
478 | enum bpf_cgroup_storage_type stype) | |
de9cbbaa RG |
479 | { |
480 | struct bpf_cgroup_storage *storage; | |
481 | struct bpf_map *map; | |
b741f163 RG |
482 | gfp_t flags; |
483 | size_t size; | |
de9cbbaa RG |
484 | u32 pages; |
485 | ||
8bad74f9 | 486 | map = prog->aux->cgroup_storage[stype]; |
de9cbbaa RG |
487 | if (!map) |
488 | return NULL; | |
489 | ||
b741f163 RG |
490 | size = bpf_cgroup_storage_calculate_size(map, &pages); |
491 | ||
de9cbbaa RG |
492 | if (bpf_map_charge_memlock(map, pages)) |
493 | return ERR_PTR(-EPERM); | |
494 | ||
495 | storage = kmalloc_node(sizeof(struct bpf_cgroup_storage), | |
496 | __GFP_ZERO | GFP_USER, map->numa_node); | |
b741f163 RG |
497 | if (!storage) |
498 | goto enomem; | |
de9cbbaa | 499 | |
b741f163 RG |
500 | flags = __GFP_ZERO | GFP_USER; |
501 | ||
502 | if (stype == BPF_CGROUP_STORAGE_SHARED) { | |
503 | storage->buf = kmalloc_node(size, flags, map->numa_node); | |
504 | if (!storage->buf) | |
505 | goto enomem; | |
e16d2f1a | 506 | check_and_init_map_lock(map, storage->buf->data); |
b741f163 RG |
507 | } else { |
508 | storage->percpu_buf = __alloc_percpu_gfp(size, 8, flags); | |
509 | if (!storage->percpu_buf) | |
510 | goto enomem; | |
de9cbbaa RG |
511 | } |
512 | ||
513 | storage->map = (struct bpf_cgroup_storage_map *)map; | |
514 | ||
515 | return storage; | |
b741f163 RG |
516 | |
517 | enomem: | |
518 | bpf_map_uncharge_memlock(map, pages); | |
519 | kfree(storage); | |
520 | return ERR_PTR(-ENOMEM); | |
521 | } | |
522 | ||
523 | static void free_shared_cgroup_storage_rcu(struct rcu_head *rcu) | |
524 | { | |
525 | struct bpf_cgroup_storage *storage = | |
526 | container_of(rcu, struct bpf_cgroup_storage, rcu); | |
527 | ||
528 | kfree(storage->buf); | |
529 | kfree(storage); | |
530 | } | |
531 | ||
532 | static void free_percpu_cgroup_storage_rcu(struct rcu_head *rcu) | |
533 | { | |
534 | struct bpf_cgroup_storage *storage = | |
535 | container_of(rcu, struct bpf_cgroup_storage, rcu); | |
536 | ||
537 | free_percpu(storage->percpu_buf); | |
538 | kfree(storage); | |
de9cbbaa RG |
539 | } |
540 | ||
541 | void bpf_cgroup_storage_free(struct bpf_cgroup_storage *storage) | |
542 | { | |
b741f163 | 543 | enum bpf_cgroup_storage_type stype; |
de9cbbaa | 544 | struct bpf_map *map; |
b741f163 | 545 | u32 pages; |
de9cbbaa RG |
546 | |
547 | if (!storage) | |
548 | return; | |
549 | ||
550 | map = &storage->map->map; | |
b741f163 RG |
551 | |
552 | bpf_cgroup_storage_calculate_size(map, &pages); | |
de9cbbaa RG |
553 | bpf_map_uncharge_memlock(map, pages); |
554 | ||
b741f163 RG |
555 | stype = cgroup_storage_type(map); |
556 | if (stype == BPF_CGROUP_STORAGE_SHARED) | |
557 | call_rcu(&storage->rcu, free_shared_cgroup_storage_rcu); | |
558 | else | |
559 | call_rcu(&storage->rcu, free_percpu_cgroup_storage_rcu); | |
de9cbbaa RG |
560 | } |
561 | ||
562 | void bpf_cgroup_storage_link(struct bpf_cgroup_storage *storage, | |
563 | struct cgroup *cgroup, | |
564 | enum bpf_attach_type type) | |
565 | { | |
566 | struct bpf_cgroup_storage_map *map; | |
567 | ||
568 | if (!storage) | |
569 | return; | |
570 | ||
571 | storage->key.attach_type = type; | |
74321038 | 572 | storage->key.cgroup_inode_id = cgroup_id(cgroup); |
de9cbbaa RG |
573 | |
574 | map = storage->map; | |
575 | ||
576 | spin_lock_bh(&map->lock); | |
577 | WARN_ON(cgroup_storage_insert(map, storage)); | |
578 | list_add(&storage->list, &map->list); | |
579 | spin_unlock_bh(&map->lock); | |
580 | } | |
581 | ||
582 | void bpf_cgroup_storage_unlink(struct bpf_cgroup_storage *storage) | |
583 | { | |
584 | struct bpf_cgroup_storage_map *map; | |
585 | struct rb_root *root; | |
586 | ||
587 | if (!storage) | |
588 | return; | |
589 | ||
590 | map = storage->map; | |
591 | ||
592 | spin_lock_bh(&map->lock); | |
593 | root = &map->root; | |
594 | rb_erase(&storage->node, root); | |
595 | ||
596 | list_del(&storage->list); | |
597 | spin_unlock_bh(&map->lock); | |
598 | } | |
599 | ||
600 | #endif |