1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
3 */
4 #ifndef _LINUX_BPF_H
5 #define _LINUX_BPF_H 1
6
7 #include <uapi/linux/bpf.h>
8 #include <uapi/linux/filter.h>
9
10 #include <linux/workqueue.h>
11 #include <linux/file.h>
12 #include <linux/percpu.h>
13 #include <linux/err.h>
14 #include <linux/rbtree_latch.h>
15 #include <linux/numa.h>
16 #include <linux/mm_types.h>
17 #include <linux/wait.h>
18 #include <linux/refcount.h>
19 #include <linux/mutex.h>
20 #include <linux/module.h>
21 #include <linux/kallsyms.h>
22 #include <linux/capability.h>
23 #include <linux/sched/mm.h>
24 #include <linux/slab.h>
25 #include <linux/percpu-refcount.h>
26 #include <linux/stddef.h>
27 #include <linux/bpfptr.h>
28 #include <linux/btf.h>
29 #include <linux/rcupdate_trace.h>
30 #include <linux/static_call.h>
31 #include <linux/memcontrol.h>
32 #include <linux/cfi.h>
33
34 struct bpf_verifier_env;
35 struct bpf_verifier_log;
36 struct perf_event;
37 struct bpf_prog;
38 struct bpf_prog_aux;
39 struct bpf_map;
40 struct bpf_arena;
41 struct sock;
42 struct seq_file;
43 struct btf;
44 struct btf_type;
45 struct exception_table_entry;
46 struct seq_operations;
47 struct bpf_iter_aux_info;
48 struct bpf_local_storage;
49 struct bpf_local_storage_map;
50 struct kobject;
51 struct mem_cgroup;
52 struct module;
53 struct bpf_func_state;
54 struct ftrace_ops;
55 struct cgroup;
56 struct bpf_token;
57 struct user_namespace;
58 struct super_block;
59 struct inode;
60
61 extern struct idr btf_idr;
62 extern spinlock_t btf_idr_lock;
63 extern struct kobject *btf_kobj;
64 extern struct bpf_mem_alloc bpf_global_ma, bpf_global_percpu_ma;
65 extern bool bpf_global_ma_set;
66
67 typedef u64 (*bpf_callback_t)(u64, u64, u64, u64, u64);
68 typedef int (*bpf_iter_init_seq_priv_t)(void *private_data,
69 struct bpf_iter_aux_info *aux);
70 typedef void (*bpf_iter_fini_seq_priv_t)(void *private_data);
71 typedef unsigned int (*bpf_func_t)(const void *,
72 const struct bpf_insn *);
73 struct bpf_iter_seq_info {
74 const struct seq_operations *seq_ops;
75 bpf_iter_init_seq_priv_t init_seq_private;
76 bpf_iter_fini_seq_priv_t fini_seq_private;
77 u32 seq_priv_size;
78 };
79
80 /* map is generic key/value storage optionally accessible by eBPF programs */
81 struct bpf_map_ops {
82 /* funcs callable from userspace (via syscall) */
83 int (*map_alloc_check)(union bpf_attr *attr);
84 struct bpf_map *(*map_alloc)(union bpf_attr *attr);
85 void (*map_release)(struct bpf_map *map, struct file *map_file);
86 void (*map_free)(struct bpf_map *map);
87 int (*map_get_next_key)(struct bpf_map *map, void *key, void *next_key);
88 void (*map_release_uref)(struct bpf_map *map);
89 void *(*map_lookup_elem_sys_only)(struct bpf_map *map, void *key);
90 int (*map_lookup_batch)(struct bpf_map *map, const union bpf_attr *attr,
91 union bpf_attr __user *uattr);
92 int (*map_lookup_and_delete_elem)(struct bpf_map *map, void *key,
93 void *value, u64 flags);
94 int (*map_lookup_and_delete_batch)(struct bpf_map *map,
95 const union bpf_attr *attr,
96 union bpf_attr __user *uattr);
97 int (*map_update_batch)(struct bpf_map *map, struct file *map_file,
98 const union bpf_attr *attr,
99 union bpf_attr __user *uattr);
100 int (*map_delete_batch)(struct bpf_map *map, const union bpf_attr *attr,
101 union bpf_attr __user *uattr);
102
103 /* funcs callable from userspace and from eBPF programs */
104 void *(*map_lookup_elem)(struct bpf_map *map, void *key);
105 long (*map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags);
106 long (*map_delete_elem)(struct bpf_map *map, void *key);
107 long (*map_push_elem)(struct bpf_map *map, void *value, u64 flags);
108 long (*map_pop_elem)(struct bpf_map *map, void *value);
109 long (*map_peek_elem)(struct bpf_map *map, void *value);
110 void *(*map_lookup_percpu_elem)(struct bpf_map *map, void *key, u32 cpu);
111
112 /* funcs called by prog_array and perf_event_array map */
113 void *(*map_fd_get_ptr)(struct bpf_map *map, struct file *map_file,
114 int fd);
115 /* If need_defer is true, the implementation should guarantee that
116 * the to-be-put element is still alive before the bpf program, which
117 * may manipulate it, exists.
118 */
119 void (*map_fd_put_ptr)(struct bpf_map *map, void *ptr, bool need_defer);
120 int (*map_gen_lookup)(struct bpf_map *map, struct bpf_insn *insn_buf);
121 u32 (*map_fd_sys_lookup_elem)(void *ptr);
122 void (*map_seq_show_elem)(struct bpf_map *map, void *key,
123 struct seq_file *m);
124 int (*map_check_btf)(const struct bpf_map *map,
125 const struct btf *btf,
126 const struct btf_type *key_type,
127 const struct btf_type *value_type);
128
129 /* Prog poke tracking helpers. */
130 int (*map_poke_track)(struct bpf_map *map, struct bpf_prog_aux *aux);
131 void (*map_poke_untrack)(struct bpf_map *map, struct bpf_prog_aux *aux);
132 void (*map_poke_run)(struct bpf_map *map, u32 key, struct bpf_prog *old,
133 struct bpf_prog *new);
134
135 /* Direct value access helpers. */
136 int (*map_direct_value_addr)(const struct bpf_map *map,
137 u64 *imm, u32 off);
138 int (*map_direct_value_meta)(const struct bpf_map *map,
139 u64 imm, u32 *off);
140 int (*map_mmap)(struct bpf_map *map, struct vm_area_struct *vma);
141 __poll_t (*map_poll)(struct bpf_map *map, struct file *filp,
142 struct poll_table_struct *pts);
143 unsigned long (*map_get_unmapped_area)(struct file *filep, unsigned long addr,
144 unsigned long len, unsigned long pgoff,
145 unsigned long flags);
146
147 /* Functions called by bpf_local_storage maps */
148 int (*map_local_storage_charge)(struct bpf_local_storage_map *smap,
149 void *owner, u32 size);
150 void (*map_local_storage_uncharge)(struct bpf_local_storage_map *smap,
151 void *owner, u32 size);
152 struct bpf_local_storage __rcu ** (*map_owner_storage_ptr)(void *owner);
153
154 /* Misc helpers.*/
155 long (*map_redirect)(struct bpf_map *map, u64 key, u64 flags);
156
157 /* map_meta_equal must be implemented for maps that can be
158 * used as an inner map. It is a runtime check to ensure
159 * an inner map can be inserted to an outer map.
160 *
161 * Some properties of the inner map has been used during the
162 * verification time. When inserting an inner map at the runtime,
163 * map_meta_equal has to ensure the inserting map has the same
164 * properties that the verifier has used earlier.
165 */
166 bool (*map_meta_equal)(const struct bpf_map *meta0,
167 const struct bpf_map *meta1);
168
169
170 int (*map_set_for_each_callback_args)(struct bpf_verifier_env *env,
171 struct bpf_func_state *caller,
172 struct bpf_func_state *callee);
173 long (*map_for_each_callback)(struct bpf_map *map,
174 bpf_callback_t callback_fn,
175 void *callback_ctx, u64 flags);
176
177 u64 (*map_mem_usage)(const struct bpf_map *map);
178
179 /* BTF id of struct allocated by map_alloc */
180 int *map_btf_id;
181
182 /* bpf_iter info used to open a seq_file */
183 const struct bpf_iter_seq_info *iter_seq_info;
184 };
185
186 enum {
187 /* Support at most 11 fields in a BTF type */
188 BTF_FIELDS_MAX = 11,
189 };
190
191 enum btf_field_type {
192 BPF_SPIN_LOCK = (1 << 0),
193 BPF_TIMER = (1 << 1),
194 BPF_KPTR_UNREF = (1 << 2),
195 BPF_KPTR_REF = (1 << 3),
196 BPF_KPTR_PERCPU = (1 << 4),
197 BPF_KPTR = BPF_KPTR_UNREF | BPF_KPTR_REF | BPF_KPTR_PERCPU,
198 BPF_LIST_HEAD = (1 << 5),
199 BPF_LIST_NODE = (1 << 6),
200 BPF_RB_ROOT = (1 << 7),
201 BPF_RB_NODE = (1 << 8),
202 BPF_GRAPH_NODE = BPF_RB_NODE | BPF_LIST_NODE,
203 BPF_GRAPH_ROOT = BPF_RB_ROOT | BPF_LIST_HEAD,
204 BPF_REFCOUNT = (1 << 9),
205 BPF_WORKQUEUE = (1 << 10),
206 };
207
208 typedef void (*btf_dtor_kfunc_t)(void *);
209
210 struct btf_field_kptr {
211 struct btf *btf;
212 struct module *module;
213 /* dtor used if btf_is_kernel(btf), otherwise the type is
214 * program-allocated, dtor is NULL, and __bpf_obj_drop_impl is used
215 */
216 btf_dtor_kfunc_t dtor;
217 u32 btf_id;
218 };
219
220 struct btf_field_graph_root {
221 struct btf *btf;
222 u32 value_btf_id;
223 u32 node_offset;
224 struct btf_record *value_rec;
225 };
226
227 struct btf_field {
228 u32 offset;
229 u32 size;
230 enum btf_field_type type;
231 union {
232 struct btf_field_kptr kptr;
233 struct btf_field_graph_root graph_root;
234 };
235 };
236
237 struct btf_record {
238 u32 cnt;
239 u32 field_mask;
240 int spin_lock_off;
241 int timer_off;
242 int wq_off;
243 int refcount_off;
244 struct btf_field fields[];
245 };
246
247 /* Non-opaque version of bpf_rb_node in uapi/linux/bpf.h */
248 struct bpf_rb_node_kern {
249 struct rb_node rb_node;
250 void *owner;
251 } __attribute__((aligned(8)));
252
253 /* Non-opaque version of bpf_list_node in uapi/linux/bpf.h */
254 struct bpf_list_node_kern {
255 struct list_head list_head;
256 void *owner;
257 } __attribute__((aligned(8)));
258
259 struct bpf_map {
260 const struct bpf_map_ops *ops;
261 struct bpf_map *inner_map_meta;
262 #ifdef CONFIG_SECURITY
263 void *security;
264 #endif
265 enum bpf_map_type map_type;
266 u32 key_size;
267 u32 value_size;
268 u32 max_entries;
269 u64 map_extra; /* any per-map-type extra fields */
270 u32 map_flags;
271 u32 id;
272 struct btf_record *record;
273 int numa_node;
274 u32 btf_key_type_id;
275 u32 btf_value_type_id;
276 u32 btf_vmlinux_value_type_id;
277 struct btf *btf;
278 #ifdef CONFIG_MEMCG
279 struct obj_cgroup *objcg;
280 #endif
281 char name[BPF_OBJ_NAME_LEN];
282 struct mutex freeze_mutex;
283 atomic64_t refcnt;
284 atomic64_t usercnt;
285 /* rcu is used before freeing and work is only used during freeing */
286 union {
287 struct work_struct work;
288 struct rcu_head rcu;
289 };
290 atomic64_t writecnt;
291 /* 'Ownership' of program-containing map is claimed by the first program
292 * that is going to use this map or by the first program which FD is
293 * stored in the map to make sure that all callers and callees have the
294 * same prog type, JITed flag and xdp_has_frags flag.
295 */
296 struct {
297 spinlock_t lock;
298 enum bpf_prog_type type;
299 bool jited;
300 bool xdp_has_frags;
301 } owner;
302 bool bypass_spec_v1;
303 bool frozen; /* write-once; write-protected by freeze_mutex */
304 bool free_after_mult_rcu_gp;
305 bool free_after_rcu_gp;
306 atomic64_t sleepable_refcnt;
307 s64 __percpu *elem_count;
308 };
309
btf_field_type_name(enum btf_field_type type)310 static inline const char *btf_field_type_name(enum btf_field_type type)
311 {
312 switch (type) {
313 case BPF_SPIN_LOCK:
314 return "bpf_spin_lock";
315 case BPF_TIMER:
316 return "bpf_timer";
317 case BPF_WORKQUEUE:
318 return "bpf_wq";
319 case BPF_KPTR_UNREF:
320 case BPF_KPTR_REF:
321 return "kptr";
322 case BPF_KPTR_PERCPU:
323 return "percpu_kptr";
324 case BPF_LIST_HEAD:
325 return "bpf_list_head";
326 case BPF_LIST_NODE:
327 return "bpf_list_node";
328 case BPF_RB_ROOT:
329 return "bpf_rb_root";
330 case BPF_RB_NODE:
331 return "bpf_rb_node";
332 case BPF_REFCOUNT:
333 return "bpf_refcount";
334 default:
335 WARN_ON_ONCE(1);
336 return "unknown";
337 }
338 }
339
btf_field_type_size(enum btf_field_type type)340 static inline u32 btf_field_type_size(enum btf_field_type type)
341 {
342 switch (type) {
343 case BPF_SPIN_LOCK:
344 return sizeof(struct bpf_spin_lock);
345 case BPF_TIMER:
346 return sizeof(struct bpf_timer);
347 case BPF_WORKQUEUE:
348 return sizeof(struct bpf_wq);
349 case BPF_KPTR_UNREF:
350 case BPF_KPTR_REF:
351 case BPF_KPTR_PERCPU:
352 return sizeof(u64);
353 case BPF_LIST_HEAD:
354 return sizeof(struct bpf_list_head);
355 case BPF_LIST_NODE:
356 return sizeof(struct bpf_list_node);
357 case BPF_RB_ROOT:
358 return sizeof(struct bpf_rb_root);
359 case BPF_RB_NODE:
360 return sizeof(struct bpf_rb_node);
361 case BPF_REFCOUNT:
362 return sizeof(struct bpf_refcount);
363 default:
364 WARN_ON_ONCE(1);
365 return 0;
366 }
367 }
368
btf_field_type_align(enum btf_field_type type)369 static inline u32 btf_field_type_align(enum btf_field_type type)
370 {
371 switch (type) {
372 case BPF_SPIN_LOCK:
373 return __alignof__(struct bpf_spin_lock);
374 case BPF_TIMER:
375 return __alignof__(struct bpf_timer);
376 case BPF_WORKQUEUE:
377 return __alignof__(struct bpf_wq);
378 case BPF_KPTR_UNREF:
379 case BPF_KPTR_REF:
380 case BPF_KPTR_PERCPU:
381 return __alignof__(u64);
382 case BPF_LIST_HEAD:
383 return __alignof__(struct bpf_list_head);
384 case BPF_LIST_NODE:
385 return __alignof__(struct bpf_list_node);
386 case BPF_RB_ROOT:
387 return __alignof__(struct bpf_rb_root);
388 case BPF_RB_NODE:
389 return __alignof__(struct bpf_rb_node);
390 case BPF_REFCOUNT:
391 return __alignof__(struct bpf_refcount);
392 default:
393 WARN_ON_ONCE(1);
394 return 0;
395 }
396 }
397
bpf_obj_init_field(const struct btf_field * field,void * addr)398 static inline void bpf_obj_init_field(const struct btf_field *field, void *addr)
399 {
400 memset(addr, 0, field->size);
401
402 switch (field->type) {
403 case BPF_REFCOUNT:
404 refcount_set((refcount_t *)addr, 1);
405 break;
406 case BPF_RB_NODE:
407 RB_CLEAR_NODE((struct rb_node *)addr);
408 break;
409 case BPF_LIST_HEAD:
410 case BPF_LIST_NODE:
411 INIT_LIST_HEAD((struct list_head *)addr);
412 break;
413 case BPF_RB_ROOT:
414 /* RB_ROOT_CACHED 0-inits, no need to do anything after memset */
415 case BPF_SPIN_LOCK:
416 case BPF_TIMER:
417 case BPF_WORKQUEUE:
418 case BPF_KPTR_UNREF:
419 case BPF_KPTR_REF:
420 case BPF_KPTR_PERCPU:
421 break;
422 default:
423 WARN_ON_ONCE(1);
424 return;
425 }
426 }
427
btf_record_has_field(const struct btf_record * rec,enum btf_field_type type)428 static inline bool btf_record_has_field(const struct btf_record *rec, enum btf_field_type type)
429 {
430 if (IS_ERR_OR_NULL(rec))
431 return false;
432 return rec->field_mask & type;
433 }
434
bpf_obj_init(const struct btf_record * rec,void * obj)435 static inline void bpf_obj_init(const struct btf_record *rec, void *obj)
436 {
437 int i;
438
439 if (IS_ERR_OR_NULL(rec))
440 return;
441 for (i = 0; i < rec->cnt; i++)
442 bpf_obj_init_field(&rec->fields[i], obj + rec->fields[i].offset);
443 }
444
445 /* 'dst' must be a temporary buffer and should not point to memory that is being
446 * used in parallel by a bpf program or bpf syscall, otherwise the access from
447 * the bpf program or bpf syscall may be corrupted by the reinitialization,
448 * leading to weird problems. Even 'dst' is newly-allocated from bpf memory
449 * allocator, it is still possible for 'dst' to be used in parallel by a bpf
450 * program or bpf syscall.
451 */
check_and_init_map_value(struct bpf_map * map,void * dst)452 static inline void check_and_init_map_value(struct bpf_map *map, void *dst)
453 {
454 bpf_obj_init(map->record, dst);
455 }
456
457 /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and
458 * forced to use 'long' read/writes to try to atomically copy long counters.
459 * Best-effort only. No barriers here, since it _will_ race with concurrent
460 * updates from BPF programs. Called from bpf syscall and mostly used with
461 * size 8 or 16 bytes, so ask compiler to inline it.
462 */
bpf_long_memcpy(void * dst,const void * src,u32 size)463 static inline void bpf_long_memcpy(void *dst, const void *src, u32 size)
464 {
465 const long *lsrc = src;
466 long *ldst = dst;
467
468 size /= sizeof(long);
469 while (size--)
470 data_race(*ldst++ = *lsrc++);
471 }
472
473 /* copy everything but bpf_spin_lock, bpf_timer, and kptrs. There could be one of each. */
bpf_obj_memcpy(struct btf_record * rec,void * dst,void * src,u32 size,bool long_memcpy)474 static inline void bpf_obj_memcpy(struct btf_record *rec,
475 void *dst, void *src, u32 size,
476 bool long_memcpy)
477 {
478 u32 curr_off = 0;
479 int i;
480
481 if (IS_ERR_OR_NULL(rec)) {
482 if (long_memcpy)
483 bpf_long_memcpy(dst, src, round_up(size, 8));
484 else
485 memcpy(dst, src, size);
486 return;
487 }
488
489 for (i = 0; i < rec->cnt; i++) {
490 u32 next_off = rec->fields[i].offset;
491 u32 sz = next_off - curr_off;
492
493 memcpy(dst + curr_off, src + curr_off, sz);
494 curr_off += rec->fields[i].size + sz;
495 }
496 memcpy(dst + curr_off, src + curr_off, size - curr_off);
497 }
498
copy_map_value(struct bpf_map * map,void * dst,void * src)499 static inline void copy_map_value(struct bpf_map *map, void *dst, void *src)
500 {
501 bpf_obj_memcpy(map->record, dst, src, map->value_size, false);
502 }
503
copy_map_value_long(struct bpf_map * map,void * dst,void * src)504 static inline void copy_map_value_long(struct bpf_map *map, void *dst, void *src)
505 {
506 bpf_obj_memcpy(map->record, dst, src, map->value_size, true);
507 }
508
bpf_obj_memzero(struct btf_record * rec,void * dst,u32 size)509 static inline void bpf_obj_memzero(struct btf_record *rec, void *dst, u32 size)
510 {
511 u32 curr_off = 0;
512 int i;
513
514 if (IS_ERR_OR_NULL(rec)) {
515 memset(dst, 0, size);
516 return;
517 }
518
519 for (i = 0; i < rec->cnt; i++) {
520 u32 next_off = rec->fields[i].offset;
521 u32 sz = next_off - curr_off;
522
523 memset(dst + curr_off, 0, sz);
524 curr_off += rec->fields[i].size + sz;
525 }
526 memset(dst + curr_off, 0, size - curr_off);
527 }
528
zero_map_value(struct bpf_map * map,void * dst)529 static inline void zero_map_value(struct bpf_map *map, void *dst)
530 {
531 bpf_obj_memzero(map->record, dst, map->value_size);
532 }
533
534 void copy_map_value_locked(struct bpf_map *map, void *dst, void *src,
535 bool lock_src);
536 void bpf_timer_cancel_and_free(void *timer);
537 void bpf_wq_cancel_and_free(void *timer);
538 void bpf_list_head_free(const struct btf_field *field, void *list_head,
539 struct bpf_spin_lock *spin_lock);
540 void bpf_rb_root_free(const struct btf_field *field, void *rb_root,
541 struct bpf_spin_lock *spin_lock);
542 u64 bpf_arena_get_kern_vm_start(struct bpf_arena *arena);
543 u64 bpf_arena_get_user_vm_start(struct bpf_arena *arena);
544 int bpf_obj_name_cpy(char *dst, const char *src, unsigned int size);
545
546 struct bpf_offload_dev;
547 struct bpf_offloaded_map;
548
549 struct bpf_map_dev_ops {
550 int (*map_get_next_key)(struct bpf_offloaded_map *map,
551 void *key, void *next_key);
552 int (*map_lookup_elem)(struct bpf_offloaded_map *map,
553 void *key, void *value);
554 int (*map_update_elem)(struct bpf_offloaded_map *map,
555 void *key, void *value, u64 flags);
556 int (*map_delete_elem)(struct bpf_offloaded_map *map, void *key);
557 };
558
559 struct bpf_offloaded_map {
560 struct bpf_map map;
561 struct net_device *netdev;
562 const struct bpf_map_dev_ops *dev_ops;
563 void *dev_priv;
564 struct list_head offloads;
565 };
566
map_to_offmap(struct bpf_map * map)567 static inline struct bpf_offloaded_map *map_to_offmap(struct bpf_map *map)
568 {
569 return container_of(map, struct bpf_offloaded_map, map);
570 }
571
bpf_map_offload_neutral(const struct bpf_map * map)572 static inline bool bpf_map_offload_neutral(const struct bpf_map *map)
573 {
574 return map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY;
575 }
576
bpf_map_support_seq_show(const struct bpf_map * map)577 static inline bool bpf_map_support_seq_show(const struct bpf_map *map)
578 {
579 return (map->btf_value_type_id || map->btf_vmlinux_value_type_id) &&
580 map->ops->map_seq_show_elem;
581 }
582
583 int map_check_no_btf(const struct bpf_map *map,
584 const struct btf *btf,
585 const struct btf_type *key_type,
586 const struct btf_type *value_type);
587
588 bool bpf_map_meta_equal(const struct bpf_map *meta0,
589 const struct bpf_map *meta1);
590
591 extern const struct bpf_map_ops bpf_map_offload_ops;
592
593 /* bpf_type_flag contains a set of flags that are applicable to the values of
594 * arg_type, ret_type and reg_type. For example, a pointer value may be null,
595 * or a memory is read-only. We classify types into two categories: base types
596 * and extended types. Extended types are base types combined with a type flag.
597 *
598 * Currently there are no more than 32 base types in arg_type, ret_type and
599 * reg_types.
600 */
601 #define BPF_BASE_TYPE_BITS 8
602
603 enum bpf_type_flag {
604 /* PTR may be NULL. */
605 PTR_MAYBE_NULL = BIT(0 + BPF_BASE_TYPE_BITS),
606
607 /* MEM is read-only. When applied on bpf_arg, it indicates the arg is
608 * compatible with both mutable and immutable memory.
609 */
610 MEM_RDONLY = BIT(1 + BPF_BASE_TYPE_BITS),
611
612 /* MEM points to BPF ring buffer reservation. */
613 MEM_RINGBUF = BIT(2 + BPF_BASE_TYPE_BITS),
614
615 /* MEM is in user address space. */
616 MEM_USER = BIT(3 + BPF_BASE_TYPE_BITS),
617
618 /* MEM is a percpu memory. MEM_PERCPU tags PTR_TO_BTF_ID. When tagged
619 * with MEM_PERCPU, PTR_TO_BTF_ID _cannot_ be directly accessed. In
620 * order to drop this tag, it must be passed into bpf_per_cpu_ptr()
621 * or bpf_this_cpu_ptr(), which will return the pointer corresponding
622 * to the specified cpu.
623 */
624 MEM_PERCPU = BIT(4 + BPF_BASE_TYPE_BITS),
625
626 /* Indicates that the argument will be released. */
627 OBJ_RELEASE = BIT(5 + BPF_BASE_TYPE_BITS),
628
629 /* PTR is not trusted. This is only used with PTR_TO_BTF_ID, to mark
630 * unreferenced and referenced kptr loaded from map value using a load
631 * instruction, so that they can only be dereferenced but not escape the
632 * BPF program into the kernel (i.e. cannot be passed as arguments to
633 * kfunc or bpf helpers).
634 */
635 PTR_UNTRUSTED = BIT(6 + BPF_BASE_TYPE_BITS),
636
637 MEM_UNINIT = BIT(7 + BPF_BASE_TYPE_BITS),
638
639 /* DYNPTR points to memory local to the bpf program. */
640 DYNPTR_TYPE_LOCAL = BIT(8 + BPF_BASE_TYPE_BITS),
641
642 /* DYNPTR points to a kernel-produced ringbuf record. */
643 DYNPTR_TYPE_RINGBUF = BIT(9 + BPF_BASE_TYPE_BITS),
644
645 /* Size is known at compile time. */
646 MEM_FIXED_SIZE = BIT(10 + BPF_BASE_TYPE_BITS),
647
648 /* MEM is of an allocated object of type in program BTF. This is used to
649 * tag PTR_TO_BTF_ID allocated using bpf_obj_new.
650 */
651 MEM_ALLOC = BIT(11 + BPF_BASE_TYPE_BITS),
652
653 /* PTR was passed from the kernel in a trusted context, and may be
654 * passed to KF_TRUSTED_ARGS kfuncs or BPF helper functions.
655 * Confusingly, this is _not_ the opposite of PTR_UNTRUSTED above.
656 * PTR_UNTRUSTED refers to a kptr that was read directly from a map
657 * without invoking bpf_kptr_xchg(). What we really need to know is
658 * whether a pointer is safe to pass to a kfunc or BPF helper function.
659 * While PTR_UNTRUSTED pointers are unsafe to pass to kfuncs and BPF
660 * helpers, they do not cover all possible instances of unsafe
661 * pointers. For example, a pointer that was obtained from walking a
662 * struct will _not_ get the PTR_UNTRUSTED type modifier, despite the
663 * fact that it may be NULL, invalid, etc. This is due to backwards
664 * compatibility requirements, as this was the behavior that was first
665 * introduced when kptrs were added. The behavior is now considered
666 * deprecated, and PTR_UNTRUSTED will eventually be removed.
667 *
668 * PTR_TRUSTED, on the other hand, is a pointer that the kernel
669 * guarantees to be valid and safe to pass to kfuncs and BPF helpers.
670 * For example, pointers passed to tracepoint arguments are considered
671 * PTR_TRUSTED, as are pointers that are passed to struct_ops
672 * callbacks. As alluded to above, pointers that are obtained from
673 * walking PTR_TRUSTED pointers are _not_ trusted. For example, if a
674 * struct task_struct *task is PTR_TRUSTED, then accessing
675 * task->last_wakee will lose the PTR_TRUSTED modifier when it's stored
676 * in a BPF register. Similarly, pointers passed to certain programs
677 * types such as kretprobes are not guaranteed to be valid, as they may
678 * for example contain an object that was recently freed.
679 */
680 PTR_TRUSTED = BIT(12 + BPF_BASE_TYPE_BITS),
681
682 /* MEM is tagged with rcu and memory access needs rcu_read_lock protection. */
683 MEM_RCU = BIT(13 + BPF_BASE_TYPE_BITS),
684
685 /* Used to tag PTR_TO_BTF_ID | MEM_ALLOC references which are non-owning.
686 * Currently only valid for linked-list and rbtree nodes. If the nodes
687 * have a bpf_refcount_field, they must be tagged MEM_RCU as well.
688 */
689 NON_OWN_REF = BIT(14 + BPF_BASE_TYPE_BITS),
690
691 /* DYNPTR points to sk_buff */
692 DYNPTR_TYPE_SKB = BIT(15 + BPF_BASE_TYPE_BITS),
693
694 /* DYNPTR points to xdp_buff */
695 DYNPTR_TYPE_XDP = BIT(16 + BPF_BASE_TYPE_BITS),
696
697 __BPF_TYPE_FLAG_MAX,
698 __BPF_TYPE_LAST_FLAG = __BPF_TYPE_FLAG_MAX - 1,
699 };
700
701 #define DYNPTR_TYPE_FLAG_MASK (DYNPTR_TYPE_LOCAL | DYNPTR_TYPE_RINGBUF | DYNPTR_TYPE_SKB \
702 | DYNPTR_TYPE_XDP)
703
704 /* Max number of base types. */
705 #define BPF_BASE_TYPE_LIMIT (1UL << BPF_BASE_TYPE_BITS)
706
707 /* Max number of all types. */
708 #define BPF_TYPE_LIMIT (__BPF_TYPE_LAST_FLAG | (__BPF_TYPE_LAST_FLAG - 1))
709
710 /* function argument constraints */
711 enum bpf_arg_type {
712 ARG_DONTCARE = 0, /* unused argument in helper function */
713
714 /* the following constraints used to prototype
715 * bpf_map_lookup/update/delete_elem() functions
716 */
717 ARG_CONST_MAP_PTR, /* const argument used as pointer to bpf_map */
718 ARG_PTR_TO_MAP_KEY, /* pointer to stack used as map key */
719 ARG_PTR_TO_MAP_VALUE, /* pointer to stack used as map value */
720
721 /* Used to prototype bpf_memcmp() and other functions that access data
722 * on eBPF program stack
723 */
724 ARG_PTR_TO_MEM, /* pointer to valid memory (stack, packet, map value) */
725 ARG_PTR_TO_ARENA,
726
727 ARG_CONST_SIZE, /* number of bytes accessed from memory */
728 ARG_CONST_SIZE_OR_ZERO, /* number of bytes accessed from memory or 0 */
729
730 ARG_PTR_TO_CTX, /* pointer to context */
731 ARG_ANYTHING, /* any (initialized) argument is ok */
732 ARG_PTR_TO_SPIN_LOCK, /* pointer to bpf_spin_lock */
733 ARG_PTR_TO_SOCK_COMMON, /* pointer to sock_common */
734 ARG_PTR_TO_INT, /* pointer to int */
735 ARG_PTR_TO_LONG, /* pointer to long */
736 ARG_PTR_TO_SOCKET, /* pointer to bpf_sock (fullsock) */
737 ARG_PTR_TO_BTF_ID, /* pointer to in-kernel struct */
738 ARG_PTR_TO_RINGBUF_MEM, /* pointer to dynamically reserved ringbuf memory */
739 ARG_CONST_ALLOC_SIZE_OR_ZERO, /* number of allocated bytes requested */
740 ARG_PTR_TO_BTF_ID_SOCK_COMMON, /* pointer to in-kernel sock_common or bpf-mirrored bpf_sock */
741 ARG_PTR_TO_PERCPU_BTF_ID, /* pointer to in-kernel percpu type */
742 ARG_PTR_TO_FUNC, /* pointer to a bpf program function */
743 ARG_PTR_TO_STACK, /* pointer to stack */
744 ARG_PTR_TO_CONST_STR, /* pointer to a null terminated read-only string */
745 ARG_PTR_TO_TIMER, /* pointer to bpf_timer */
746 ARG_PTR_TO_KPTR, /* pointer to referenced kptr */
747 ARG_PTR_TO_DYNPTR, /* pointer to bpf_dynptr. See bpf_type_flag for dynptr type */
748 __BPF_ARG_TYPE_MAX,
749
750 /* Extended arg_types. */
751 ARG_PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_MAP_VALUE,
752 ARG_PTR_TO_MEM_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_MEM,
753 ARG_PTR_TO_CTX_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_CTX,
754 ARG_PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_SOCKET,
755 ARG_PTR_TO_STACK_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_STACK,
756 ARG_PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_BTF_ID,
757 /* pointer to memory does not need to be initialized, helper function must fill
758 * all bytes or clear them in error case.
759 */
760 ARG_PTR_TO_UNINIT_MEM = MEM_UNINIT | ARG_PTR_TO_MEM,
761 /* Pointer to valid memory of size known at compile time. */
762 ARG_PTR_TO_FIXED_SIZE_MEM = MEM_FIXED_SIZE | ARG_PTR_TO_MEM,
763
764 /* This must be the last entry. Its purpose is to ensure the enum is
765 * wide enough to hold the higher bits reserved for bpf_type_flag.
766 */
767 __BPF_ARG_TYPE_LIMIT = BPF_TYPE_LIMIT,
768 };
769 static_assert(__BPF_ARG_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
770
771 /* type of values returned from helper functions */
772 enum bpf_return_type {
773 RET_INTEGER, /* function returns integer */
774 RET_VOID, /* function doesn't return anything */
775 RET_PTR_TO_MAP_VALUE, /* returns a pointer to map elem value */
776 RET_PTR_TO_SOCKET, /* returns a pointer to a socket */
777 RET_PTR_TO_TCP_SOCK, /* returns a pointer to a tcp_sock */
778 RET_PTR_TO_SOCK_COMMON, /* returns a pointer to a sock_common */
779 RET_PTR_TO_MEM, /* returns a pointer to memory */
780 RET_PTR_TO_MEM_OR_BTF_ID, /* returns a pointer to a valid memory or a btf_id */
781 RET_PTR_TO_BTF_ID, /* returns a pointer to a btf_id */
782 __BPF_RET_TYPE_MAX,
783
784 /* Extended ret_types. */
785 RET_PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_MAP_VALUE,
786 RET_PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_SOCKET,
787 RET_PTR_TO_TCP_SOCK_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_TCP_SOCK,
788 RET_PTR_TO_SOCK_COMMON_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_SOCK_COMMON,
789 RET_PTR_TO_RINGBUF_MEM_OR_NULL = PTR_MAYBE_NULL | MEM_RINGBUF | RET_PTR_TO_MEM,
790 RET_PTR_TO_DYNPTR_MEM_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_MEM,
791 RET_PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_BTF_ID,
792 RET_PTR_TO_BTF_ID_TRUSTED = PTR_TRUSTED | RET_PTR_TO_BTF_ID,
793
794 /* This must be the last entry. Its purpose is to ensure the enum is
795 * wide enough to hold the higher bits reserved for bpf_type_flag.
796 */
797 __BPF_RET_TYPE_LIMIT = BPF_TYPE_LIMIT,
798 };
799 static_assert(__BPF_RET_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
800
801 /* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs
802 * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL
803 * instructions after verifying
804 */
805 struct bpf_func_proto {
806 u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
807 bool gpl_only;
808 bool pkt_access;
809 bool might_sleep;
810 enum bpf_return_type ret_type;
811 union {
812 struct {
813 enum bpf_arg_type arg1_type;
814 enum bpf_arg_type arg2_type;
815 enum bpf_arg_type arg3_type;
816 enum bpf_arg_type arg4_type;
817 enum bpf_arg_type arg5_type;
818 };
819 enum bpf_arg_type arg_type[5];
820 };
821 union {
822 struct {
823 u32 *arg1_btf_id;
824 u32 *arg2_btf_id;
825 u32 *arg3_btf_id;
826 u32 *arg4_btf_id;
827 u32 *arg5_btf_id;
828 };
829 u32 *arg_btf_id[5];
830 struct {
831 size_t arg1_size;
832 size_t arg2_size;
833 size_t arg3_size;
834 size_t arg4_size;
835 size_t arg5_size;
836 };
837 size_t arg_size[5];
838 };
839 int *ret_btf_id; /* return value btf_id */
840 bool (*allowed)(const struct bpf_prog *prog);
841 };
842
843 /* bpf_context is intentionally undefined structure. Pointer to bpf_context is
844 * the first argument to eBPF programs.
845 * For socket filters: 'struct bpf_context *' == 'struct sk_buff *'
846 */
847 struct bpf_context;
848
849 enum bpf_access_type {
850 BPF_READ = 1,
851 BPF_WRITE = 2
852 };
853
854 /* types of values stored in eBPF registers */
855 /* Pointer types represent:
856 * pointer
857 * pointer + imm
858 * pointer + (u16) var
859 * pointer + (u16) var + imm
860 * if (range > 0) then [ptr, ptr + range - off) is safe to access
861 * if (id > 0) means that some 'var' was added
862 * if (off > 0) means that 'imm' was added
863 */
864 enum bpf_reg_type {
865 NOT_INIT = 0, /* nothing was written into register */
866 SCALAR_VALUE, /* reg doesn't contain a valid pointer */
867 PTR_TO_CTX, /* reg points to bpf_context */
868 CONST_PTR_TO_MAP, /* reg points to struct bpf_map */
869 PTR_TO_MAP_VALUE, /* reg points to map element value */
870 PTR_TO_MAP_KEY, /* reg points to a map element key */
871 PTR_TO_STACK, /* reg == frame_pointer + offset */
872 PTR_TO_PACKET_META, /* skb->data - meta_len */
873 PTR_TO_PACKET, /* reg points to skb->data */
874 PTR_TO_PACKET_END, /* skb->data + headlen */
875 PTR_TO_FLOW_KEYS, /* reg points to bpf_flow_keys */
876 PTR_TO_SOCKET, /* reg points to struct bpf_sock */
877 PTR_TO_SOCK_COMMON, /* reg points to sock_common */
878 PTR_TO_TCP_SOCK, /* reg points to struct tcp_sock */
879 PTR_TO_TP_BUFFER, /* reg points to a writable raw tp's buffer */
880 PTR_TO_XDP_SOCK, /* reg points to struct xdp_sock */
881 /* PTR_TO_BTF_ID points to a kernel struct that does not need
882 * to be null checked by the BPF program. This does not imply the
883 * pointer is _not_ null and in practice this can easily be a null
884 * pointer when reading pointer chains. The assumption is program
885 * context will handle null pointer dereference typically via fault
886 * handling. The verifier must keep this in mind and can make no
887 * assumptions about null or non-null when doing branch analysis.
888 * Further, when passed into helpers the helpers can not, without
889 * additional context, assume the value is non-null.
890 */
891 PTR_TO_BTF_ID,
892 /* PTR_TO_BTF_ID_OR_NULL points to a kernel struct that has not
893 * been checked for null. Used primarily to inform the verifier
894 * an explicit null check is required for this struct.
895 */
896 PTR_TO_MEM, /* reg points to valid memory region */
897 PTR_TO_ARENA,
898 PTR_TO_BUF, /* reg points to a read/write buffer */
899 PTR_TO_FUNC, /* reg points to a bpf program function */
900 CONST_PTR_TO_DYNPTR, /* reg points to a const struct bpf_dynptr */
901 __BPF_REG_TYPE_MAX,
902
903 /* Extended reg_types. */
904 PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | PTR_TO_MAP_VALUE,
905 PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | PTR_TO_SOCKET,
906 PTR_TO_SOCK_COMMON_OR_NULL = PTR_MAYBE_NULL | PTR_TO_SOCK_COMMON,
907 PTR_TO_TCP_SOCK_OR_NULL = PTR_MAYBE_NULL | PTR_TO_TCP_SOCK,
908 PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | PTR_TO_BTF_ID,
909
910 /* This must be the last entry. Its purpose is to ensure the enum is
911 * wide enough to hold the higher bits reserved for bpf_type_flag.
912 */
913 __BPF_REG_TYPE_LIMIT = BPF_TYPE_LIMIT,
914 };
915 static_assert(__BPF_REG_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
916
917 /* The information passed from prog-specific *_is_valid_access
918 * back to the verifier.
919 */
920 struct bpf_insn_access_aux {
921 enum bpf_reg_type reg_type;
922 union {
923 int ctx_field_size;
924 struct {
925 struct btf *btf;
926 u32 btf_id;
927 };
928 };
929 struct bpf_verifier_log *log; /* for verbose logs */
930 };
931
932 static inline void
bpf_ctx_record_field_size(struct bpf_insn_access_aux * aux,u32 size)933 bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size)
934 {
935 aux->ctx_field_size = size;
936 }
937
bpf_is_ldimm64(const struct bpf_insn * insn)938 static bool bpf_is_ldimm64(const struct bpf_insn *insn)
939 {
940 return insn->code == (BPF_LD | BPF_IMM | BPF_DW);
941 }
942
bpf_pseudo_func(const struct bpf_insn * insn)943 static inline bool bpf_pseudo_func(const struct bpf_insn *insn)
944 {
945 return bpf_is_ldimm64(insn) && insn->src_reg == BPF_PSEUDO_FUNC;
946 }
947
948 struct bpf_prog_ops {
949 int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr,
950 union bpf_attr __user *uattr);
951 };
952
953 struct bpf_reg_state;
954 struct bpf_verifier_ops {
955 /* return eBPF function prototype for verification */
956 const struct bpf_func_proto *
957 (*get_func_proto)(enum bpf_func_id func_id,
958 const struct bpf_prog *prog);
959
960 /* return true if 'size' wide access at offset 'off' within bpf_context
961 * with 'type' (read or write) is allowed
962 */
963 bool (*is_valid_access)(int off, int size, enum bpf_access_type type,
964 const struct bpf_prog *prog,
965 struct bpf_insn_access_aux *info);
966 int (*gen_prologue)(struct bpf_insn *insn, bool direct_write,
967 const struct bpf_prog *prog);
968 int (*gen_ld_abs)(const struct bpf_insn *orig,
969 struct bpf_insn *insn_buf);
970 u32 (*convert_ctx_access)(enum bpf_access_type type,
971 const struct bpf_insn *src,
972 struct bpf_insn *dst,
973 struct bpf_prog *prog, u32 *target_size);
974 int (*btf_struct_access)(struct bpf_verifier_log *log,
975 const struct bpf_reg_state *reg,
976 int off, int size);
977 };
978
979 struct bpf_prog_offload_ops {
980 /* verifier basic callbacks */
981 int (*insn_hook)(struct bpf_verifier_env *env,
982 int insn_idx, int prev_insn_idx);
983 int (*finalize)(struct bpf_verifier_env *env);
984 /* verifier optimization callbacks (called after .finalize) */
985 int (*replace_insn)(struct bpf_verifier_env *env, u32 off,
986 struct bpf_insn *insn);
987 int (*remove_insns)(struct bpf_verifier_env *env, u32 off, u32 cnt);
988 /* program management callbacks */
989 int (*prepare)(struct bpf_prog *prog);
990 int (*translate)(struct bpf_prog *prog);
991 void (*destroy)(struct bpf_prog *prog);
992 };
993
994 struct bpf_prog_offload {
995 struct bpf_prog *prog;
996 struct net_device *netdev;
997 struct bpf_offload_dev *offdev;
998 void *dev_priv;
999 struct list_head offloads;
1000 bool dev_state;
1001 bool opt_failed;
1002 void *jited_image;
1003 u32 jited_len;
1004 };
1005
1006 enum bpf_cgroup_storage_type {
1007 BPF_CGROUP_STORAGE_SHARED,
1008 BPF_CGROUP_STORAGE_PERCPU,
1009 __BPF_CGROUP_STORAGE_MAX
1010 };
1011
1012 #define MAX_BPF_CGROUP_STORAGE_TYPE __BPF_CGROUP_STORAGE_MAX
1013
1014 /* The longest tracepoint has 12 args.
1015 * See include/trace/bpf_probe.h
1016 */
1017 #define MAX_BPF_FUNC_ARGS 12
1018
1019 /* The maximum number of arguments passed through registers
1020 * a single function may have.
1021 */
1022 #define MAX_BPF_FUNC_REG_ARGS 5
1023
1024 /* The argument is a structure. */
1025 #define BTF_FMODEL_STRUCT_ARG BIT(0)
1026
1027 /* The argument is signed. */
1028 #define BTF_FMODEL_SIGNED_ARG BIT(1)
1029
1030 struct btf_func_model {
1031 u8 ret_size;
1032 u8 ret_flags;
1033 u8 nr_args;
1034 u8 arg_size[MAX_BPF_FUNC_ARGS];
1035 u8 arg_flags[MAX_BPF_FUNC_ARGS];
1036 };
1037
1038 /* Restore arguments before returning from trampoline to let original function
1039 * continue executing. This flag is used for fentry progs when there are no
1040 * fexit progs.
1041 */
1042 #define BPF_TRAMP_F_RESTORE_REGS BIT(0)
1043 /* Call original function after fentry progs, but before fexit progs.
1044 * Makes sense for fentry/fexit, normal calls and indirect calls.
1045 */
1046 #define BPF_TRAMP_F_CALL_ORIG BIT(1)
1047 /* Skip current frame and return to parent. Makes sense for fentry/fexit
1048 * programs only. Should not be used with normal calls and indirect calls.
1049 */
1050 #define BPF_TRAMP_F_SKIP_FRAME BIT(2)
1051 /* Store IP address of the caller on the trampoline stack,
1052 * so it's available for trampoline's programs.
1053 */
1054 #define BPF_TRAMP_F_IP_ARG BIT(3)
1055 /* Return the return value of fentry prog. Only used by bpf_struct_ops. */
1056 #define BPF_TRAMP_F_RET_FENTRY_RET BIT(4)
1057
1058 /* Get original function from stack instead of from provided direct address.
1059 * Makes sense for trampolines with fexit or fmod_ret programs.
1060 */
1061 #define BPF_TRAMP_F_ORIG_STACK BIT(5)
1062
1063 /* This trampoline is on a function with another ftrace_ops with IPMODIFY,
1064 * e.g., a live patch. This flag is set and cleared by ftrace call backs,
1065 */
1066 #define BPF_TRAMP_F_SHARE_IPMODIFY BIT(6)
1067
1068 /* Indicate that current trampoline is in a tail call context. Then, it has to
1069 * cache and restore tail_call_cnt to avoid infinite tail call loop.
1070 */
1071 #define BPF_TRAMP_F_TAIL_CALL_CTX BIT(7)
1072
1073 /*
1074 * Indicate the trampoline should be suitable to receive indirect calls;
1075 * without this indirectly calling the generated code can result in #UD/#CP,
1076 * depending on the CFI options.
1077 *
1078 * Used by bpf_struct_ops.
1079 *
1080 * Incompatible with FENTRY usage, overloads @func_addr argument.
1081 */
1082 #define BPF_TRAMP_F_INDIRECT BIT(8)
1083
1084 /* Each call __bpf_prog_enter + call bpf_func + call __bpf_prog_exit is ~50
1085 * bytes on x86.
1086 */
1087 enum {
1088 #if defined(__s390x__)
1089 BPF_MAX_TRAMP_LINKS = 27,
1090 #else
1091 BPF_MAX_TRAMP_LINKS = 38,
1092 #endif
1093 };
1094
1095 struct bpf_tramp_links {
1096 struct bpf_tramp_link *links[BPF_MAX_TRAMP_LINKS];
1097 int nr_links;
1098 };
1099
1100 struct bpf_tramp_run_ctx;
1101
1102 /* Different use cases for BPF trampoline:
1103 * 1. replace nop at the function entry (kprobe equivalent)
1104 * flags = BPF_TRAMP_F_RESTORE_REGS
1105 * fentry = a set of programs to run before returning from trampoline
1106 *
1107 * 2. replace nop at the function entry (kprobe + kretprobe equivalent)
1108 * flags = BPF_TRAMP_F_CALL_ORIG | BPF_TRAMP_F_SKIP_FRAME
1109 * orig_call = fentry_ip + MCOUNT_INSN_SIZE
1110 * fentry = a set of program to run before calling original function
1111 * fexit = a set of program to run after original function
1112 *
1113 * 3. replace direct call instruction anywhere in the function body
1114 * or assign a function pointer for indirect call (like tcp_congestion_ops->cong_avoid)
1115 * With flags = 0
1116 * fentry = a set of programs to run before returning from trampoline
1117 * With flags = BPF_TRAMP_F_CALL_ORIG
1118 * orig_call = original callback addr or direct function addr
1119 * fentry = a set of program to run before calling original function
1120 * fexit = a set of program to run after original function
1121 */
1122 struct bpf_tramp_image;
1123 int arch_prepare_bpf_trampoline(struct bpf_tramp_image *im, void *image, void *image_end,
1124 const struct btf_func_model *m, u32 flags,
1125 struct bpf_tramp_links *tlinks,
1126 void *func_addr);
1127 void *arch_alloc_bpf_trampoline(unsigned int size);
1128 void arch_free_bpf_trampoline(void *image, unsigned int size);
1129 int __must_check arch_protect_bpf_trampoline(void *image, unsigned int size);
1130 int arch_bpf_trampoline_size(const struct btf_func_model *m, u32 flags,
1131 struct bpf_tramp_links *tlinks, void *func_addr);
1132
1133 u64 notrace __bpf_prog_enter_sleepable_recur(struct bpf_prog *prog,
1134 struct bpf_tramp_run_ctx *run_ctx);
1135 void notrace __bpf_prog_exit_sleepable_recur(struct bpf_prog *prog, u64 start,
1136 struct bpf_tramp_run_ctx *run_ctx);
1137 void notrace __bpf_tramp_enter(struct bpf_tramp_image *tr);
1138 void notrace __bpf_tramp_exit(struct bpf_tramp_image *tr);
1139 typedef u64 (*bpf_trampoline_enter_t)(struct bpf_prog *prog,
1140 struct bpf_tramp_run_ctx *run_ctx);
1141 typedef void (*bpf_trampoline_exit_t)(struct bpf_prog *prog, u64 start,
1142 struct bpf_tramp_run_ctx *run_ctx);
1143 bpf_trampoline_enter_t bpf_trampoline_enter(const struct bpf_prog *prog);
1144 bpf_trampoline_exit_t bpf_trampoline_exit(const struct bpf_prog *prog);
1145
1146 struct bpf_ksym {
1147 unsigned long start;
1148 unsigned long end;
1149 char name[KSYM_NAME_LEN];
1150 struct list_head lnode;
1151 struct latch_tree_node tnode;
1152 bool prog;
1153 };
1154
1155 enum bpf_tramp_prog_type {
1156 BPF_TRAMP_FENTRY,
1157 BPF_TRAMP_FEXIT,
1158 BPF_TRAMP_MODIFY_RETURN,
1159 BPF_TRAMP_MAX,
1160 BPF_TRAMP_REPLACE, /* more than MAX */
1161 };
1162
1163 struct bpf_tramp_image {
1164 void *image;
1165 int size;
1166 struct bpf_ksym ksym;
1167 struct percpu_ref pcref;
1168 void *ip_after_call;
1169 void *ip_epilogue;
1170 union {
1171 struct rcu_head rcu;
1172 struct work_struct work;
1173 };
1174 };
1175
1176 struct bpf_trampoline {
1177 /* hlist for trampoline_table */
1178 struct hlist_node hlist;
1179 struct ftrace_ops *fops;
1180 /* serializes access to fields of this trampoline */
1181 struct mutex mutex;
1182 refcount_t refcnt;
1183 u32 flags;
1184 u64 key;
1185 struct {
1186 struct btf_func_model model;
1187 void *addr;
1188 bool ftrace_managed;
1189 } func;
1190 /* if !NULL this is BPF_PROG_TYPE_EXT program that extends another BPF
1191 * program by replacing one of its functions. func.addr is the address
1192 * of the function it replaced.
1193 */
1194 struct bpf_prog *extension_prog;
1195 /* list of BPF programs using this trampoline */
1196 struct hlist_head progs_hlist[BPF_TRAMP_MAX];
1197 /* Number of attached programs. A counter per kind. */
1198 int progs_cnt[BPF_TRAMP_MAX];
1199 /* Executable image of trampoline */
1200 struct bpf_tramp_image *cur_image;
1201 };
1202
1203 struct bpf_attach_target_info {
1204 struct btf_func_model fmodel;
1205 long tgt_addr;
1206 struct module *tgt_mod;
1207 const char *tgt_name;
1208 const struct btf_type *tgt_type;
1209 };
1210
1211 #define BPF_DISPATCHER_MAX 48 /* Fits in 2048B */
1212
1213 struct bpf_dispatcher_prog {
1214 struct bpf_prog *prog;
1215 refcount_t users;
1216 };
1217
1218 struct bpf_dispatcher {
1219 /* dispatcher mutex */
1220 struct mutex mutex;
1221 void *func;
1222 struct bpf_dispatcher_prog progs[BPF_DISPATCHER_MAX];
1223 int num_progs;
1224 void *image;
1225 void *rw_image;
1226 u32 image_off;
1227 struct bpf_ksym ksym;
1228 #ifdef CONFIG_HAVE_STATIC_CALL
1229 struct static_call_key *sc_key;
1230 void *sc_tramp;
1231 #endif
1232 };
1233
1234 #ifndef __bpfcall
1235 #define __bpfcall __nocfi
1236 #endif
1237
bpf_dispatcher_nop_func(const void * ctx,const struct bpf_insn * insnsi,bpf_func_t bpf_func)1238 static __always_inline __bpfcall unsigned int bpf_dispatcher_nop_func(
1239 const void *ctx,
1240 const struct bpf_insn *insnsi,
1241 bpf_func_t bpf_func)
1242 {
1243 return bpf_func(ctx, insnsi);
1244 }
1245
1246 /* the implementation of the opaque uapi struct bpf_dynptr */
1247 struct bpf_dynptr_kern {
1248 void *data;
1249 /* Size represents the number of usable bytes of dynptr data.
1250 * If for example the offset is at 4 for a local dynptr whose data is
1251 * of type u64, the number of usable bytes is 4.
1252 *
1253 * The upper 8 bits are reserved. It is as follows:
1254 * Bits 0 - 23 = size
1255 * Bits 24 - 30 = dynptr type
1256 * Bit 31 = whether dynptr is read-only
1257 */
1258 u32 size;
1259 u32 offset;
1260 } __aligned(8);
1261
1262 enum bpf_dynptr_type {
1263 BPF_DYNPTR_TYPE_INVALID,
1264 /* Points to memory that is local to the bpf program */
1265 BPF_DYNPTR_TYPE_LOCAL,
1266 /* Underlying data is a ringbuf record */
1267 BPF_DYNPTR_TYPE_RINGBUF,
1268 /* Underlying data is a sk_buff */
1269 BPF_DYNPTR_TYPE_SKB,
1270 /* Underlying data is a xdp_buff */
1271 BPF_DYNPTR_TYPE_XDP,
1272 };
1273
1274 int bpf_dynptr_check_size(u32 size);
1275 u32 __bpf_dynptr_size(const struct bpf_dynptr_kern *ptr);
1276 const void *__bpf_dynptr_data(const struct bpf_dynptr_kern *ptr, u32 len);
1277 void *__bpf_dynptr_data_rw(const struct bpf_dynptr_kern *ptr, u32 len);
1278 bool __bpf_dynptr_is_rdonly(const struct bpf_dynptr_kern *ptr);
1279
1280 #ifdef CONFIG_BPF_JIT
1281 int bpf_trampoline_link_prog(struct bpf_tramp_link *link, struct bpf_trampoline *tr);
1282 int bpf_trampoline_unlink_prog(struct bpf_tramp_link *link, struct bpf_trampoline *tr);
1283 struct bpf_trampoline *bpf_trampoline_get(u64 key,
1284 struct bpf_attach_target_info *tgt_info);
1285 void bpf_trampoline_put(struct bpf_trampoline *tr);
1286 int arch_prepare_bpf_dispatcher(void *image, void *buf, s64 *funcs, int num_funcs);
1287
1288 /*
1289 * When the architecture supports STATIC_CALL replace the bpf_dispatcher_fn
1290 * indirection with a direct call to the bpf program. If the architecture does
1291 * not have STATIC_CALL, avoid a double-indirection.
1292 */
1293 #ifdef CONFIG_HAVE_STATIC_CALL
1294
1295 #define __BPF_DISPATCHER_SC_INIT(_name) \
1296 .sc_key = &STATIC_CALL_KEY(_name), \
1297 .sc_tramp = STATIC_CALL_TRAMP_ADDR(_name),
1298
1299 #define __BPF_DISPATCHER_SC(name) \
1300 DEFINE_STATIC_CALL(bpf_dispatcher_##name##_call, bpf_dispatcher_nop_func)
1301
1302 #define __BPF_DISPATCHER_CALL(name) \
1303 static_call(bpf_dispatcher_##name##_call)(ctx, insnsi, bpf_func)
1304
1305 #define __BPF_DISPATCHER_UPDATE(_d, _new) \
1306 __static_call_update((_d)->sc_key, (_d)->sc_tramp, (_new))
1307
1308 #else
1309 #define __BPF_DISPATCHER_SC_INIT(name)
1310 #define __BPF_DISPATCHER_SC(name)
1311 #define __BPF_DISPATCHER_CALL(name) bpf_func(ctx, insnsi)
1312 #define __BPF_DISPATCHER_UPDATE(_d, _new)
1313 #endif
1314
1315 #define BPF_DISPATCHER_INIT(_name) { \
1316 .mutex = __MUTEX_INITIALIZER(_name.mutex), \
1317 .func = &_name##_func, \
1318 .progs = {}, \
1319 .num_progs = 0, \
1320 .image = NULL, \
1321 .image_off = 0, \
1322 .ksym = { \
1323 .name = #_name, \
1324 .lnode = LIST_HEAD_INIT(_name.ksym.lnode), \
1325 }, \
1326 __BPF_DISPATCHER_SC_INIT(_name##_call) \
1327 }
1328
1329 #define DEFINE_BPF_DISPATCHER(name) \
1330 __BPF_DISPATCHER_SC(name); \
1331 noinline __bpfcall unsigned int bpf_dispatcher_##name##_func( \
1332 const void *ctx, \
1333 const struct bpf_insn *insnsi, \
1334 bpf_func_t bpf_func) \
1335 { \
1336 return __BPF_DISPATCHER_CALL(name); \
1337 } \
1338 EXPORT_SYMBOL(bpf_dispatcher_##name##_func); \
1339 struct bpf_dispatcher bpf_dispatcher_##name = \
1340 BPF_DISPATCHER_INIT(bpf_dispatcher_##name);
1341
1342 #define DECLARE_BPF_DISPATCHER(name) \
1343 unsigned int bpf_dispatcher_##name##_func( \
1344 const void *ctx, \
1345 const struct bpf_insn *insnsi, \
1346 bpf_func_t bpf_func); \
1347 extern struct bpf_dispatcher bpf_dispatcher_##name;
1348
1349 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_##name##_func
1350 #define BPF_DISPATCHER_PTR(name) (&bpf_dispatcher_##name)
1351 void bpf_dispatcher_change_prog(struct bpf_dispatcher *d, struct bpf_prog *from,
1352 struct bpf_prog *to);
1353 /* Called only from JIT-enabled code, so there's no need for stubs. */
1354 void bpf_image_ksym_add(void *data, unsigned int size, struct bpf_ksym *ksym);
1355 void bpf_image_ksym_del(struct bpf_ksym *ksym);
1356 void bpf_ksym_add(struct bpf_ksym *ksym);
1357 void bpf_ksym_del(struct bpf_ksym *ksym);
1358 int bpf_jit_charge_modmem(u32 size);
1359 void bpf_jit_uncharge_modmem(u32 size);
1360 bool bpf_prog_has_trampoline(const struct bpf_prog *prog);
1361 #else
bpf_trampoline_link_prog(struct bpf_tramp_link * link,struct bpf_trampoline * tr)1362 static inline int bpf_trampoline_link_prog(struct bpf_tramp_link *link,
1363 struct bpf_trampoline *tr)
1364 {
1365 return -ENOTSUPP;
1366 }
bpf_trampoline_unlink_prog(struct bpf_tramp_link * link,struct bpf_trampoline * tr)1367 static inline int bpf_trampoline_unlink_prog(struct bpf_tramp_link *link,
1368 struct bpf_trampoline *tr)
1369 {
1370 return -ENOTSUPP;
1371 }
bpf_trampoline_get(u64 key,struct bpf_attach_target_info * tgt_info)1372 static inline struct bpf_trampoline *bpf_trampoline_get(u64 key,
1373 struct bpf_attach_target_info *tgt_info)
1374 {
1375 return NULL;
1376 }
bpf_trampoline_put(struct bpf_trampoline * tr)1377 static inline void bpf_trampoline_put(struct bpf_trampoline *tr) {}
1378 #define DEFINE_BPF_DISPATCHER(name)
1379 #define DECLARE_BPF_DISPATCHER(name)
1380 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_nop_func
1381 #define BPF_DISPATCHER_PTR(name) NULL
bpf_dispatcher_change_prog(struct bpf_dispatcher * d,struct bpf_prog * from,struct bpf_prog * to)1382 static inline void bpf_dispatcher_change_prog(struct bpf_dispatcher *d,
1383 struct bpf_prog *from,
1384 struct bpf_prog *to) {}
is_bpf_image_address(unsigned long address)1385 static inline bool is_bpf_image_address(unsigned long address)
1386 {
1387 return false;
1388 }
bpf_prog_has_trampoline(const struct bpf_prog * prog)1389 static inline bool bpf_prog_has_trampoline(const struct bpf_prog *prog)
1390 {
1391 return false;
1392 }
1393 #endif
1394
1395 struct bpf_func_info_aux {
1396 u16 linkage;
1397 bool unreliable;
1398 bool called : 1;
1399 bool verified : 1;
1400 };
1401
1402 enum bpf_jit_poke_reason {
1403 BPF_POKE_REASON_TAIL_CALL,
1404 };
1405
1406 /* Descriptor of pokes pointing /into/ the JITed image. */
1407 struct bpf_jit_poke_descriptor {
1408 void *tailcall_target;
1409 void *tailcall_bypass;
1410 void *bypass_addr;
1411 void *aux;
1412 union {
1413 struct {
1414 struct bpf_map *map;
1415 u32 key;
1416 } tail_call;
1417 };
1418 bool tailcall_target_stable;
1419 u8 adj_off;
1420 u16 reason;
1421 u32 insn_idx;
1422 };
1423
1424 /* reg_type info for ctx arguments */
1425 struct bpf_ctx_arg_aux {
1426 u32 offset;
1427 enum bpf_reg_type reg_type;
1428 struct btf *btf;
1429 u32 btf_id;
1430 };
1431
1432 struct btf_mod_pair {
1433 struct btf *btf;
1434 struct module *module;
1435 };
1436
1437 struct bpf_kfunc_desc_tab;
1438
1439 struct bpf_prog_aux {
1440 atomic64_t refcnt;
1441 u32 used_map_cnt;
1442 u32 used_btf_cnt;
1443 u32 max_ctx_offset;
1444 u32 max_pkt_offset;
1445 u32 max_tp_access;
1446 u32 stack_depth;
1447 u32 id;
1448 u32 func_cnt; /* used by non-func prog as the number of func progs */
1449 u32 real_func_cnt; /* includes hidden progs, only used for JIT and freeing progs */
1450 u32 func_idx; /* 0 for non-func prog, the index in func array for func prog */
1451 u32 attach_btf_id; /* in-kernel BTF type id to attach to */
1452 u32 ctx_arg_info_size;
1453 u32 max_rdonly_access;
1454 u32 max_rdwr_access;
1455 struct btf *attach_btf;
1456 const struct bpf_ctx_arg_aux *ctx_arg_info;
1457 struct mutex dst_mutex; /* protects dst_* pointers below, *after* prog becomes visible */
1458 struct bpf_prog *dst_prog;
1459 struct bpf_trampoline *dst_trampoline;
1460 enum bpf_prog_type saved_dst_prog_type;
1461 enum bpf_attach_type saved_dst_attach_type;
1462 bool verifier_zext; /* Zero extensions has been inserted by verifier. */
1463 bool dev_bound; /* Program is bound to the netdev. */
1464 bool offload_requested; /* Program is bound and offloaded to the netdev. */
1465 bool attach_btf_trace; /* true if attaching to BTF-enabled raw tp */
1466 bool attach_tracing_prog; /* true if tracing another tracing program */
1467 bool func_proto_unreliable;
1468 bool tail_call_reachable;
1469 bool xdp_has_frags;
1470 bool exception_cb;
1471 bool exception_boundary;
1472 struct bpf_arena *arena;
1473 /* BTF_KIND_FUNC_PROTO for valid attach_btf_id */
1474 const struct btf_type *attach_func_proto;
1475 /* function name for valid attach_btf_id */
1476 const char *attach_func_name;
1477 struct bpf_prog **func;
1478 void *jit_data; /* JIT specific data. arch dependent */
1479 struct bpf_jit_poke_descriptor *poke_tab;
1480 struct bpf_kfunc_desc_tab *kfunc_tab;
1481 struct bpf_kfunc_btf_tab *kfunc_btf_tab;
1482 u32 size_poke_tab;
1483 #ifdef CONFIG_FINEIBT
1484 struct bpf_ksym ksym_prefix;
1485 #endif
1486 struct bpf_ksym ksym;
1487 const struct bpf_prog_ops *ops;
1488 struct bpf_map **used_maps;
1489 struct mutex used_maps_mutex; /* mutex for used_maps and used_map_cnt */
1490 struct btf_mod_pair *used_btfs;
1491 struct bpf_prog *prog;
1492 struct user_struct *user;
1493 u64 load_time; /* ns since boottime */
1494 u32 verified_insns;
1495 int cgroup_atype; /* enum cgroup_bpf_attach_type */
1496 struct bpf_map *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
1497 char name[BPF_OBJ_NAME_LEN];
1498 u64 (*bpf_exception_cb)(u64 cookie, u64 sp, u64 bp, u64, u64);
1499 #ifdef CONFIG_SECURITY
1500 void *security;
1501 #endif
1502 struct bpf_token *token;
1503 struct bpf_prog_offload *offload;
1504 struct btf *btf;
1505 struct bpf_func_info *func_info;
1506 struct bpf_func_info_aux *func_info_aux;
1507 /* bpf_line_info loaded from userspace. linfo->insn_off
1508 * has the xlated insn offset.
1509 * Both the main and sub prog share the same linfo.
1510 * The subprog can access its first linfo by
1511 * using the linfo_idx.
1512 */
1513 struct bpf_line_info *linfo;
1514 /* jited_linfo is the jited addr of the linfo. It has a
1515 * one to one mapping to linfo:
1516 * jited_linfo[i] is the jited addr for the linfo[i]->insn_off.
1517 * Both the main and sub prog share the same jited_linfo.
1518 * The subprog can access its first jited_linfo by
1519 * using the linfo_idx.
1520 */
1521 void **jited_linfo;
1522 u32 func_info_cnt;
1523 u32 nr_linfo;
1524 /* subprog can use linfo_idx to access its first linfo and
1525 * jited_linfo.
1526 * main prog always has linfo_idx == 0
1527 */
1528 u32 linfo_idx;
1529 struct module *mod;
1530 u32 num_exentries;
1531 struct exception_table_entry *extable;
1532 union {
1533 struct work_struct work;
1534 struct rcu_head rcu;
1535 };
1536 };
1537
1538 struct bpf_prog {
1539 u16 pages; /* Number of allocated pages */
1540 u16 jited:1, /* Is our filter JIT'ed? */
1541 jit_requested:1,/* archs need to JIT the prog */
1542 gpl_compatible:1, /* Is filter GPL compatible? */
1543 cb_access:1, /* Is control block accessed? */
1544 dst_needed:1, /* Do we need dst entry? */
1545 blinding_requested:1, /* needs constant blinding */
1546 blinded:1, /* Was blinded */
1547 is_func:1, /* program is a bpf function */
1548 kprobe_override:1, /* Do we override a kprobe? */
1549 has_callchain_buf:1, /* callchain buffer allocated? */
1550 enforce_expected_attach_type:1, /* Enforce expected_attach_type checking at attach time */
1551 call_get_stack:1, /* Do we call bpf_get_stack() or bpf_get_stackid() */
1552 call_get_func_ip:1, /* Do we call get_func_ip() */
1553 tstamp_type_access:1, /* Accessed __sk_buff->tstamp_type */
1554 sleepable:1; /* BPF program is sleepable */
1555 enum bpf_prog_type type; /* Type of BPF program */
1556 enum bpf_attach_type expected_attach_type; /* For some prog types */
1557 u32 len; /* Number of filter blocks */
1558 u32 jited_len; /* Size of jited insns in bytes */
1559 u8 tag[BPF_TAG_SIZE];
1560 struct bpf_prog_stats __percpu *stats;
1561 int __percpu *active;
1562 unsigned int (*bpf_func)(const void *ctx,
1563 const struct bpf_insn *insn);
1564 struct bpf_prog_aux *aux; /* Auxiliary fields */
1565 struct sock_fprog_kern *orig_prog; /* Original BPF program */
1566 /* Instructions for interpreter */
1567 union {
1568 DECLARE_FLEX_ARRAY(struct sock_filter, insns);
1569 DECLARE_FLEX_ARRAY(struct bpf_insn, insnsi);
1570 };
1571 };
1572
1573 struct bpf_array_aux {
1574 /* Programs with direct jumps into programs part of this array. */
1575 struct list_head poke_progs;
1576 struct bpf_map *map;
1577 struct mutex poke_mutex;
1578 struct work_struct work;
1579 };
1580
1581 struct bpf_link {
1582 atomic64_t refcnt;
1583 u32 id;
1584 enum bpf_link_type type;
1585 const struct bpf_link_ops *ops;
1586 struct bpf_prog *prog;
1587 /* rcu is used before freeing, work can be used to schedule that
1588 * RCU-based freeing before that, so they never overlap
1589 */
1590 union {
1591 struct rcu_head rcu;
1592 struct work_struct work;
1593 };
1594 };
1595
1596 struct bpf_link_ops {
1597 void (*release)(struct bpf_link *link);
1598 /* deallocate link resources callback, called without RCU grace period
1599 * waiting
1600 */
1601 void (*dealloc)(struct bpf_link *link);
1602 /* deallocate link resources callback, called after RCU grace period;
1603 * if underlying BPF program is sleepable we go through tasks trace
1604 * RCU GP and then "classic" RCU GP
1605 */
1606 void (*dealloc_deferred)(struct bpf_link *link);
1607 int (*detach)(struct bpf_link *link);
1608 int (*update_prog)(struct bpf_link *link, struct bpf_prog *new_prog,
1609 struct bpf_prog *old_prog);
1610 void (*show_fdinfo)(const struct bpf_link *link, struct seq_file *seq);
1611 int (*fill_link_info)(const struct bpf_link *link,
1612 struct bpf_link_info *info);
1613 int (*update_map)(struct bpf_link *link, struct bpf_map *new_map,
1614 struct bpf_map *old_map);
1615 __poll_t (*poll)(struct file *file, struct poll_table_struct *pts);
1616 };
1617
1618 struct bpf_tramp_link {
1619 struct bpf_link link;
1620 struct hlist_node tramp_hlist;
1621 u64 cookie;
1622 };
1623
1624 struct bpf_shim_tramp_link {
1625 struct bpf_tramp_link link;
1626 struct bpf_trampoline *trampoline;
1627 };
1628
1629 struct bpf_tracing_link {
1630 struct bpf_tramp_link link;
1631 enum bpf_attach_type attach_type;
1632 struct bpf_trampoline *trampoline;
1633 struct bpf_prog *tgt_prog;
1634 };
1635
1636 struct bpf_raw_tp_link {
1637 struct bpf_link link;
1638 struct bpf_raw_event_map *btp;
1639 u64 cookie;
1640 };
1641
1642 struct bpf_link_primer {
1643 struct bpf_link *link;
1644 struct file *file;
1645 int fd;
1646 u32 id;
1647 };
1648
1649 struct bpf_mount_opts {
1650 kuid_t uid;
1651 kgid_t gid;
1652 umode_t mode;
1653
1654 /* BPF token-related delegation options */
1655 u64 delegate_cmds;
1656 u64 delegate_maps;
1657 u64 delegate_progs;
1658 u64 delegate_attachs;
1659 };
1660
1661 struct bpf_token {
1662 struct work_struct work;
1663 atomic64_t refcnt;
1664 struct user_namespace *userns;
1665 u64 allowed_cmds;
1666 u64 allowed_maps;
1667 u64 allowed_progs;
1668 u64 allowed_attachs;
1669 #ifdef CONFIG_SECURITY
1670 void *security;
1671 #endif
1672 };
1673
1674 struct bpf_struct_ops_value;
1675 struct btf_member;
1676
1677 #define BPF_STRUCT_OPS_MAX_NR_MEMBERS 64
1678 /**
1679 * struct bpf_struct_ops - A structure of callbacks allowing a subsystem to
1680 * define a BPF_MAP_TYPE_STRUCT_OPS map type composed
1681 * of BPF_PROG_TYPE_STRUCT_OPS progs.
1682 * @verifier_ops: A structure of callbacks that are invoked by the verifier
1683 * when determining whether the struct_ops progs in the
1684 * struct_ops map are valid.
1685 * @init: A callback that is invoked a single time, and before any other
1686 * callback, to initialize the structure. A nonzero return value means
1687 * the subsystem could not be initialized.
1688 * @check_member: When defined, a callback invoked by the verifier to allow
1689 * the subsystem to determine if an entry in the struct_ops map
1690 * is valid. A nonzero return value means that the map is
1691 * invalid and should be rejected by the verifier.
1692 * @init_member: A callback that is invoked for each member of the struct_ops
1693 * map to allow the subsystem to initialize the member. A nonzero
1694 * value means the member could not be initialized. This callback
1695 * is exclusive with the @type, @type_id, @value_type, and
1696 * @value_id fields.
1697 * @reg: A callback that is invoked when the struct_ops map has been
1698 * initialized and is being attached to. Zero means the struct_ops map
1699 * has been successfully registered and is live. A nonzero return value
1700 * means the struct_ops map could not be registered.
1701 * @unreg: A callback that is invoked when the struct_ops map should be
1702 * unregistered.
1703 * @update: A callback that is invoked when the live struct_ops map is being
1704 * updated to contain new values. This callback is only invoked when
1705 * the struct_ops map is loaded with BPF_F_LINK. If not defined, the
1706 * it is assumed that the struct_ops map cannot be updated.
1707 * @validate: A callback that is invoked after all of the members have been
1708 * initialized. This callback should perform static checks on the
1709 * map, meaning that it should either fail or succeed
1710 * deterministically. A struct_ops map that has been validated may
1711 * not necessarily succeed in being registered if the call to @reg
1712 * fails. For example, a valid struct_ops map may be loaded, but
1713 * then fail to be registered due to there being another active
1714 * struct_ops map on the system in the subsystem already. For this
1715 * reason, if this callback is not defined, the check is skipped as
1716 * the struct_ops map will have final verification performed in
1717 * @reg.
1718 * @type: BTF type.
1719 * @value_type: Value type.
1720 * @name: The name of the struct bpf_struct_ops object.
1721 * @func_models: Func models
1722 * @type_id: BTF type id.
1723 * @value_id: BTF value id.
1724 */
1725 struct bpf_struct_ops {
1726 const struct bpf_verifier_ops *verifier_ops;
1727 int (*init)(struct btf *btf);
1728 int (*check_member)(const struct btf_type *t,
1729 const struct btf_member *member,
1730 const struct bpf_prog *prog);
1731 int (*init_member)(const struct btf_type *t,
1732 const struct btf_member *member,
1733 void *kdata, const void *udata);
1734 int (*reg)(void *kdata, struct bpf_link *link);
1735 void (*unreg)(void *kdata, struct bpf_link *link);
1736 int (*update)(void *kdata, void *old_kdata, struct bpf_link *link);
1737 int (*validate)(void *kdata);
1738 void *cfi_stubs;
1739 struct module *owner;
1740 const char *name;
1741 struct btf_func_model func_models[BPF_STRUCT_OPS_MAX_NR_MEMBERS];
1742 };
1743
1744 /* Every member of a struct_ops type has an instance even a member is not
1745 * an operator (function pointer). The "info" field will be assigned to
1746 * prog->aux->ctx_arg_info of BPF struct_ops programs to provide the
1747 * argument information required by the verifier to verify the program.
1748 *
1749 * btf_ctx_access() will lookup prog->aux->ctx_arg_info to find the
1750 * corresponding entry for an given argument.
1751 */
1752 struct bpf_struct_ops_arg_info {
1753 struct bpf_ctx_arg_aux *info;
1754 u32 cnt;
1755 };
1756
1757 struct bpf_struct_ops_desc {
1758 struct bpf_struct_ops *st_ops;
1759
1760 const struct btf_type *type;
1761 const struct btf_type *value_type;
1762 u32 type_id;
1763 u32 value_id;
1764
1765 /* Collection of argument information for each member */
1766 struct bpf_struct_ops_arg_info *arg_info;
1767 };
1768
1769 enum bpf_struct_ops_state {
1770 BPF_STRUCT_OPS_STATE_INIT,
1771 BPF_STRUCT_OPS_STATE_INUSE,
1772 BPF_STRUCT_OPS_STATE_TOBEFREE,
1773 BPF_STRUCT_OPS_STATE_READY,
1774 };
1775
1776 struct bpf_struct_ops_common_value {
1777 refcount_t refcnt;
1778 enum bpf_struct_ops_state state;
1779 };
1780
1781 #if defined(CONFIG_BPF_JIT) && defined(CONFIG_BPF_SYSCALL)
1782 /* This macro helps developer to register a struct_ops type and generate
1783 * type information correctly. Developers should use this macro to register
1784 * a struct_ops type instead of calling __register_bpf_struct_ops() directly.
1785 */
1786 #define register_bpf_struct_ops(st_ops, type) \
1787 ({ \
1788 struct bpf_struct_ops_##type { \
1789 struct bpf_struct_ops_common_value common; \
1790 struct type data ____cacheline_aligned_in_smp; \
1791 }; \
1792 BTF_TYPE_EMIT(struct bpf_struct_ops_##type); \
1793 __register_bpf_struct_ops(st_ops); \
1794 })
1795 #define BPF_MODULE_OWNER ((void *)((0xeB9FUL << 2) + POISON_POINTER_DELTA))
1796 bool bpf_struct_ops_get(const void *kdata);
1797 void bpf_struct_ops_put(const void *kdata);
1798 int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map, void *key,
1799 void *value);
1800 int bpf_struct_ops_prepare_trampoline(struct bpf_tramp_links *tlinks,
1801 struct bpf_tramp_link *link,
1802 const struct btf_func_model *model,
1803 void *stub_func,
1804 void **image, u32 *image_off,
1805 bool allow_alloc);
1806 void bpf_struct_ops_image_free(void *image);
bpf_try_module_get(const void * data,struct module * owner)1807 static inline bool bpf_try_module_get(const void *data, struct module *owner)
1808 {
1809 if (owner == BPF_MODULE_OWNER)
1810 return bpf_struct_ops_get(data);
1811 else
1812 return try_module_get(owner);
1813 }
bpf_module_put(const void * data,struct module * owner)1814 static inline void bpf_module_put(const void *data, struct module *owner)
1815 {
1816 if (owner == BPF_MODULE_OWNER)
1817 bpf_struct_ops_put(data);
1818 else
1819 module_put(owner);
1820 }
1821 int bpf_struct_ops_link_create(union bpf_attr *attr);
1822
1823 #ifdef CONFIG_NET
1824 /* Define it here to avoid the use of forward declaration */
1825 struct bpf_dummy_ops_state {
1826 int val;
1827 };
1828
1829 struct bpf_dummy_ops {
1830 int (*test_1)(struct bpf_dummy_ops_state *cb);
1831 int (*test_2)(struct bpf_dummy_ops_state *cb, int a1, unsigned short a2,
1832 char a3, unsigned long a4);
1833 int (*test_sleepable)(struct bpf_dummy_ops_state *cb);
1834 };
1835
1836 int bpf_struct_ops_test_run(struct bpf_prog *prog, const union bpf_attr *kattr,
1837 union bpf_attr __user *uattr);
1838 #endif
1839 int bpf_struct_ops_desc_init(struct bpf_struct_ops_desc *st_ops_desc,
1840 struct btf *btf,
1841 struct bpf_verifier_log *log);
1842 void bpf_map_struct_ops_info_fill(struct bpf_map_info *info, struct bpf_map *map);
1843 void bpf_struct_ops_desc_release(struct bpf_struct_ops_desc *st_ops_desc);
1844 #else
1845 #define register_bpf_struct_ops(st_ops, type) ({ (void *)(st_ops); 0; })
bpf_try_module_get(const void * data,struct module * owner)1846 static inline bool bpf_try_module_get(const void *data, struct module *owner)
1847 {
1848 return try_module_get(owner);
1849 }
bpf_module_put(const void * data,struct module * owner)1850 static inline void bpf_module_put(const void *data, struct module *owner)
1851 {
1852 module_put(owner);
1853 }
bpf_struct_ops_map_sys_lookup_elem(struct bpf_map * map,void * key,void * value)1854 static inline int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map,
1855 void *key,
1856 void *value)
1857 {
1858 return -EINVAL;
1859 }
bpf_struct_ops_link_create(union bpf_attr * attr)1860 static inline int bpf_struct_ops_link_create(union bpf_attr *attr)
1861 {
1862 return -EOPNOTSUPP;
1863 }
bpf_map_struct_ops_info_fill(struct bpf_map_info * info,struct bpf_map * map)1864 static inline void bpf_map_struct_ops_info_fill(struct bpf_map_info *info, struct bpf_map *map)
1865 {
1866 }
1867
bpf_struct_ops_desc_release(struct bpf_struct_ops_desc * st_ops_desc)1868 static inline void bpf_struct_ops_desc_release(struct bpf_struct_ops_desc *st_ops_desc)
1869 {
1870 }
1871
1872 #endif
1873
1874 #if defined(CONFIG_CGROUP_BPF) && defined(CONFIG_BPF_LSM)
1875 int bpf_trampoline_link_cgroup_shim(struct bpf_prog *prog,
1876 int cgroup_atype);
1877 void bpf_trampoline_unlink_cgroup_shim(struct bpf_prog *prog);
1878 #else
bpf_trampoline_link_cgroup_shim(struct bpf_prog * prog,int cgroup_atype)1879 static inline int bpf_trampoline_link_cgroup_shim(struct bpf_prog *prog,
1880 int cgroup_atype)
1881 {
1882 return -EOPNOTSUPP;
1883 }
bpf_trampoline_unlink_cgroup_shim(struct bpf_prog * prog)1884 static inline void bpf_trampoline_unlink_cgroup_shim(struct bpf_prog *prog)
1885 {
1886 }
1887 #endif
1888
1889 struct bpf_array {
1890 struct bpf_map map;
1891 u32 elem_size;
1892 u32 index_mask;
1893 struct bpf_array_aux *aux;
1894 union {
1895 DECLARE_FLEX_ARRAY(char, value) __aligned(8);
1896 DECLARE_FLEX_ARRAY(void *, ptrs) __aligned(8);
1897 DECLARE_FLEX_ARRAY(void __percpu *, pptrs) __aligned(8);
1898 };
1899 };
1900
1901 #define BPF_COMPLEXITY_LIMIT_INSNS 1000000 /* yes. 1M insns */
1902 #define MAX_TAIL_CALL_CNT 33
1903
1904 /* Maximum number of loops for bpf_loop and bpf_iter_num.
1905 * It's enum to expose it (and thus make it discoverable) through BTF.
1906 */
1907 enum {
1908 BPF_MAX_LOOPS = 8 * 1024 * 1024,
1909 };
1910
1911 #define BPF_F_ACCESS_MASK (BPF_F_RDONLY | \
1912 BPF_F_RDONLY_PROG | \
1913 BPF_F_WRONLY | \
1914 BPF_F_WRONLY_PROG)
1915
1916 #define BPF_MAP_CAN_READ BIT(0)
1917 #define BPF_MAP_CAN_WRITE BIT(1)
1918
1919 /* Maximum number of user-producer ring buffer samples that can be drained in
1920 * a call to bpf_user_ringbuf_drain().
1921 */
1922 #define BPF_MAX_USER_RINGBUF_SAMPLES (128 * 1024)
1923
bpf_map_flags_to_cap(struct bpf_map * map)1924 static inline u32 bpf_map_flags_to_cap(struct bpf_map *map)
1925 {
1926 u32 access_flags = map->map_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
1927
1928 /* Combination of BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG is
1929 * not possible.
1930 */
1931 if (access_flags & BPF_F_RDONLY_PROG)
1932 return BPF_MAP_CAN_READ;
1933 else if (access_flags & BPF_F_WRONLY_PROG)
1934 return BPF_MAP_CAN_WRITE;
1935 else
1936 return BPF_MAP_CAN_READ | BPF_MAP_CAN_WRITE;
1937 }
1938
bpf_map_flags_access_ok(u32 access_flags)1939 static inline bool bpf_map_flags_access_ok(u32 access_flags)
1940 {
1941 return (access_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG)) !=
1942 (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
1943 }
1944
1945 struct bpf_event_entry {
1946 struct perf_event *event;
1947 struct file *perf_file;
1948 struct file *map_file;
1949 struct rcu_head rcu;
1950 };
1951
map_type_contains_progs(struct bpf_map * map)1952 static inline bool map_type_contains_progs(struct bpf_map *map)
1953 {
1954 return map->map_type == BPF_MAP_TYPE_PROG_ARRAY ||
1955 map->map_type == BPF_MAP_TYPE_DEVMAP ||
1956 map->map_type == BPF_MAP_TYPE_CPUMAP;
1957 }
1958
1959 bool bpf_prog_map_compatible(struct bpf_map *map, const struct bpf_prog *fp);
1960 int bpf_prog_calc_tag(struct bpf_prog *fp);
1961
1962 const struct bpf_func_proto *bpf_get_trace_printk_proto(void);
1963 const struct bpf_func_proto *bpf_get_trace_vprintk_proto(void);
1964
1965 typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src,
1966 unsigned long off, unsigned long len);
1967 typedef u32 (*bpf_convert_ctx_access_t)(enum bpf_access_type type,
1968 const struct bpf_insn *src,
1969 struct bpf_insn *dst,
1970 struct bpf_prog *prog,
1971 u32 *target_size);
1972
1973 u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size,
1974 void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy);
1975
1976 /* an array of programs to be executed under rcu_lock.
1977 *
1978 * Typical usage:
1979 * ret = bpf_prog_run_array(rcu_dereference(&bpf_prog_array), ctx, bpf_prog_run);
1980 *
1981 * the structure returned by bpf_prog_array_alloc() should be populated
1982 * with program pointers and the last pointer must be NULL.
1983 * The user has to keep refcnt on the program and make sure the program
1984 * is removed from the array before bpf_prog_put().
1985 * The 'struct bpf_prog_array *' should only be replaced with xchg()
1986 * since other cpus are walking the array of pointers in parallel.
1987 */
1988 struct bpf_prog_array_item {
1989 struct bpf_prog *prog;
1990 union {
1991 struct bpf_cgroup_storage *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
1992 u64 bpf_cookie;
1993 };
1994 };
1995
1996 struct bpf_prog_array {
1997 struct rcu_head rcu;
1998 struct bpf_prog_array_item items[];
1999 };
2000
2001 struct bpf_empty_prog_array {
2002 struct bpf_prog_array hdr;
2003 struct bpf_prog *null_prog;
2004 };
2005
2006 /* to avoid allocating empty bpf_prog_array for cgroups that
2007 * don't have bpf program attached use one global 'bpf_empty_prog_array'
2008 * It will not be modified the caller of bpf_prog_array_alloc()
2009 * (since caller requested prog_cnt == 0)
2010 * that pointer should be 'freed' by bpf_prog_array_free()
2011 */
2012 extern struct bpf_empty_prog_array bpf_empty_prog_array;
2013
2014 struct bpf_prog_array *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags);
2015 void bpf_prog_array_free(struct bpf_prog_array *progs);
2016 /* Use when traversal over the bpf_prog_array uses tasks_trace rcu */
2017 void bpf_prog_array_free_sleepable(struct bpf_prog_array *progs);
2018 int bpf_prog_array_length(struct bpf_prog_array *progs);
2019 bool bpf_prog_array_is_empty(struct bpf_prog_array *array);
2020 int bpf_prog_array_copy_to_user(struct bpf_prog_array *progs,
2021 __u32 __user *prog_ids, u32 cnt);
2022
2023 void bpf_prog_array_delete_safe(struct bpf_prog_array *progs,
2024 struct bpf_prog *old_prog);
2025 int bpf_prog_array_delete_safe_at(struct bpf_prog_array *array, int index);
2026 int bpf_prog_array_update_at(struct bpf_prog_array *array, int index,
2027 struct bpf_prog *prog);
2028 int bpf_prog_array_copy_info(struct bpf_prog_array *array,
2029 u32 *prog_ids, u32 request_cnt,
2030 u32 *prog_cnt);
2031 int bpf_prog_array_copy(struct bpf_prog_array *old_array,
2032 struct bpf_prog *exclude_prog,
2033 struct bpf_prog *include_prog,
2034 u64 bpf_cookie,
2035 struct bpf_prog_array **new_array);
2036
2037 struct bpf_run_ctx {};
2038
2039 struct bpf_cg_run_ctx {
2040 struct bpf_run_ctx run_ctx;
2041 const struct bpf_prog_array_item *prog_item;
2042 int retval;
2043 };
2044
2045 struct bpf_trace_run_ctx {
2046 struct bpf_run_ctx run_ctx;
2047 u64 bpf_cookie;
2048 bool is_uprobe;
2049 };
2050
2051 struct bpf_tramp_run_ctx {
2052 struct bpf_run_ctx run_ctx;
2053 u64 bpf_cookie;
2054 struct bpf_run_ctx *saved_run_ctx;
2055 };
2056
bpf_set_run_ctx(struct bpf_run_ctx * new_ctx)2057 static inline struct bpf_run_ctx *bpf_set_run_ctx(struct bpf_run_ctx *new_ctx)
2058 {
2059 struct bpf_run_ctx *old_ctx = NULL;
2060
2061 #ifdef CONFIG_BPF_SYSCALL
2062 old_ctx = current->bpf_ctx;
2063 current->bpf_ctx = new_ctx;
2064 #endif
2065 return old_ctx;
2066 }
2067
bpf_reset_run_ctx(struct bpf_run_ctx * old_ctx)2068 static inline void bpf_reset_run_ctx(struct bpf_run_ctx *old_ctx)
2069 {
2070 #ifdef CONFIG_BPF_SYSCALL
2071 current->bpf_ctx = old_ctx;
2072 #endif
2073 }
2074
2075 /* BPF program asks to bypass CAP_NET_BIND_SERVICE in bind. */
2076 #define BPF_RET_BIND_NO_CAP_NET_BIND_SERVICE (1 << 0)
2077 /* BPF program asks to set CN on the packet. */
2078 #define BPF_RET_SET_CN (1 << 0)
2079
2080 typedef u32 (*bpf_prog_run_fn)(const struct bpf_prog *prog, const void *ctx);
2081
2082 static __always_inline u32
bpf_prog_run_array(const struct bpf_prog_array * array,const void * ctx,bpf_prog_run_fn run_prog)2083 bpf_prog_run_array(const struct bpf_prog_array *array,
2084 const void *ctx, bpf_prog_run_fn run_prog)
2085 {
2086 const struct bpf_prog_array_item *item;
2087 const struct bpf_prog *prog;
2088 struct bpf_run_ctx *old_run_ctx;
2089 struct bpf_trace_run_ctx run_ctx;
2090 u32 ret = 1;
2091
2092 RCU_LOCKDEP_WARN(!rcu_read_lock_held(), "no rcu lock held");
2093
2094 if (unlikely(!array))
2095 return ret;
2096
2097 run_ctx.is_uprobe = false;
2098
2099 migrate_disable();
2100 old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
2101 item = &array->items[0];
2102 while ((prog = READ_ONCE(item->prog))) {
2103 run_ctx.bpf_cookie = item->bpf_cookie;
2104 ret &= run_prog(prog, ctx);
2105 item++;
2106 }
2107 bpf_reset_run_ctx(old_run_ctx);
2108 migrate_enable();
2109 return ret;
2110 }
2111
2112 /* Notes on RCU design for bpf_prog_arrays containing sleepable programs:
2113 *
2114 * We use the tasks_trace rcu flavor read section to protect the bpf_prog_array
2115 * overall. As a result, we must use the bpf_prog_array_free_sleepable
2116 * in order to use the tasks_trace rcu grace period.
2117 *
2118 * When a non-sleepable program is inside the array, we take the rcu read
2119 * section and disable preemption for that program alone, so it can access
2120 * rcu-protected dynamically sized maps.
2121 */
2122 static __always_inline u32
bpf_prog_run_array_uprobe(const struct bpf_prog_array __rcu * array_rcu,const void * ctx,bpf_prog_run_fn run_prog)2123 bpf_prog_run_array_uprobe(const struct bpf_prog_array __rcu *array_rcu,
2124 const void *ctx, bpf_prog_run_fn run_prog)
2125 {
2126 const struct bpf_prog_array_item *item;
2127 const struct bpf_prog *prog;
2128 const struct bpf_prog_array *array;
2129 struct bpf_run_ctx *old_run_ctx;
2130 struct bpf_trace_run_ctx run_ctx;
2131 u32 ret = 1;
2132
2133 might_fault();
2134
2135 rcu_read_lock_trace();
2136 migrate_disable();
2137
2138 run_ctx.is_uprobe = true;
2139
2140 array = rcu_dereference_check(array_rcu, rcu_read_lock_trace_held());
2141 if (unlikely(!array))
2142 goto out;
2143 old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
2144 item = &array->items[0];
2145 while ((prog = READ_ONCE(item->prog))) {
2146 if (!prog->sleepable)
2147 rcu_read_lock();
2148
2149 run_ctx.bpf_cookie = item->bpf_cookie;
2150 ret &= run_prog(prog, ctx);
2151 item++;
2152
2153 if (!prog->sleepable)
2154 rcu_read_unlock();
2155 }
2156 bpf_reset_run_ctx(old_run_ctx);
2157 out:
2158 migrate_enable();
2159 rcu_read_unlock_trace();
2160 return ret;
2161 }
2162
2163 #ifdef CONFIG_BPF_SYSCALL
2164 DECLARE_PER_CPU(int, bpf_prog_active);
2165 extern struct mutex bpf_stats_enabled_mutex;
2166
2167 /*
2168 * Block execution of BPF programs attached to instrumentation (perf,
2169 * kprobes, tracepoints) to prevent deadlocks on map operations as any of
2170 * these events can happen inside a region which holds a map bucket lock
2171 * and can deadlock on it.
2172 */
bpf_disable_instrumentation(void)2173 static inline void bpf_disable_instrumentation(void)
2174 {
2175 migrate_disable();
2176 this_cpu_inc(bpf_prog_active);
2177 }
2178
bpf_enable_instrumentation(void)2179 static inline void bpf_enable_instrumentation(void)
2180 {
2181 this_cpu_dec(bpf_prog_active);
2182 migrate_enable();
2183 }
2184
2185 extern const struct super_operations bpf_super_ops;
2186 extern const struct file_operations bpf_map_fops;
2187 extern const struct file_operations bpf_prog_fops;
2188 extern const struct file_operations bpf_iter_fops;
2189
2190 #define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \
2191 extern const struct bpf_prog_ops _name ## _prog_ops; \
2192 extern const struct bpf_verifier_ops _name ## _verifier_ops;
2193 #define BPF_MAP_TYPE(_id, _ops) \
2194 extern const struct bpf_map_ops _ops;
2195 #define BPF_LINK_TYPE(_id, _name)
2196 #include <linux/bpf_types.h>
2197 #undef BPF_PROG_TYPE
2198 #undef BPF_MAP_TYPE
2199 #undef BPF_LINK_TYPE
2200
2201 extern const struct bpf_prog_ops bpf_offload_prog_ops;
2202 extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops;
2203 extern const struct bpf_verifier_ops xdp_analyzer_ops;
2204
2205 struct bpf_prog *bpf_prog_get(u32 ufd);
2206 struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type,
2207 bool attach_drv);
2208 void bpf_prog_add(struct bpf_prog *prog, int i);
2209 void bpf_prog_sub(struct bpf_prog *prog, int i);
2210 void bpf_prog_inc(struct bpf_prog *prog);
2211 struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog);
2212 void bpf_prog_put(struct bpf_prog *prog);
2213
2214 void bpf_prog_free_id(struct bpf_prog *prog);
2215 void bpf_map_free_id(struct bpf_map *map);
2216
2217 struct btf_field *btf_record_find(const struct btf_record *rec,
2218 u32 offset, u32 field_mask);
2219 void btf_record_free(struct btf_record *rec);
2220 void bpf_map_free_record(struct bpf_map *map);
2221 struct btf_record *btf_record_dup(const struct btf_record *rec);
2222 bool btf_record_equal(const struct btf_record *rec_a, const struct btf_record *rec_b);
2223 void bpf_obj_free_timer(const struct btf_record *rec, void *obj);
2224 void bpf_obj_free_workqueue(const struct btf_record *rec, void *obj);
2225 void bpf_obj_free_fields(const struct btf_record *rec, void *obj);
2226 void __bpf_obj_drop_impl(void *p, const struct btf_record *rec, bool percpu);
2227
2228 struct bpf_map *bpf_map_get(u32 ufd);
2229 struct bpf_map *bpf_map_get_with_uref(u32 ufd);
2230 struct bpf_map *__bpf_map_get(struct fd f);
2231 void bpf_map_inc(struct bpf_map *map);
2232 void bpf_map_inc_with_uref(struct bpf_map *map);
2233 struct bpf_map *__bpf_map_inc_not_zero(struct bpf_map *map, bool uref);
2234 struct bpf_map * __must_check bpf_map_inc_not_zero(struct bpf_map *map);
2235 void bpf_map_put_with_uref(struct bpf_map *map);
2236 void bpf_map_put(struct bpf_map *map);
2237 void *bpf_map_area_alloc(u64 size, int numa_node);
2238 void *bpf_map_area_mmapable_alloc(u64 size, int numa_node);
2239 void bpf_map_area_free(void *base);
2240 bool bpf_map_write_active(const struct bpf_map *map);
2241 void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr);
2242 int generic_map_lookup_batch(struct bpf_map *map,
2243 const union bpf_attr *attr,
2244 union bpf_attr __user *uattr);
2245 int generic_map_update_batch(struct bpf_map *map, struct file *map_file,
2246 const union bpf_attr *attr,
2247 union bpf_attr __user *uattr);
2248 int generic_map_delete_batch(struct bpf_map *map,
2249 const union bpf_attr *attr,
2250 union bpf_attr __user *uattr);
2251 struct bpf_map *bpf_map_get_curr_or_next(u32 *id);
2252 struct bpf_prog *bpf_prog_get_curr_or_next(u32 *id);
2253
2254 int bpf_map_alloc_pages(const struct bpf_map *map, gfp_t gfp, int nid,
2255 unsigned long nr_pages, struct page **page_array);
2256 #ifdef CONFIG_MEMCG
2257 void *bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags,
2258 int node);
2259 void *bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags);
2260 void *bpf_map_kvcalloc(struct bpf_map *map, size_t n, size_t size,
2261 gfp_t flags);
2262 void __percpu *bpf_map_alloc_percpu(const struct bpf_map *map, size_t size,
2263 size_t align, gfp_t flags);
2264 #else
2265 /*
2266 * These specialized allocators have to be macros for their allocations to be
2267 * accounted separately (to have separate alloc_tag).
2268 */
2269 #define bpf_map_kmalloc_node(_map, _size, _flags, _node) \
2270 kmalloc_node(_size, _flags, _node)
2271 #define bpf_map_kzalloc(_map, _size, _flags) \
2272 kzalloc(_size, _flags)
2273 #define bpf_map_kvcalloc(_map, _n, _size, _flags) \
2274 kvcalloc(_n, _size, _flags)
2275 #define bpf_map_alloc_percpu(_map, _size, _align, _flags) \
2276 __alloc_percpu_gfp(_size, _align, _flags)
2277 #endif
2278
2279 static inline int
bpf_map_init_elem_count(struct bpf_map * map)2280 bpf_map_init_elem_count(struct bpf_map *map)
2281 {
2282 size_t size = sizeof(*map->elem_count), align = size;
2283 gfp_t flags = GFP_USER | __GFP_NOWARN;
2284
2285 map->elem_count = bpf_map_alloc_percpu(map, size, align, flags);
2286 if (!map->elem_count)
2287 return -ENOMEM;
2288
2289 return 0;
2290 }
2291
2292 static inline void
bpf_map_free_elem_count(struct bpf_map * map)2293 bpf_map_free_elem_count(struct bpf_map *map)
2294 {
2295 free_percpu(map->elem_count);
2296 }
2297
bpf_map_inc_elem_count(struct bpf_map * map)2298 static inline void bpf_map_inc_elem_count(struct bpf_map *map)
2299 {
2300 this_cpu_inc(*map->elem_count);
2301 }
2302
bpf_map_dec_elem_count(struct bpf_map * map)2303 static inline void bpf_map_dec_elem_count(struct bpf_map *map)
2304 {
2305 this_cpu_dec(*map->elem_count);
2306 }
2307
2308 extern int sysctl_unprivileged_bpf_disabled;
2309
2310 bool bpf_token_capable(const struct bpf_token *token, int cap);
2311
bpf_allow_ptr_leaks(const struct bpf_token * token)2312 static inline bool bpf_allow_ptr_leaks(const struct bpf_token *token)
2313 {
2314 return bpf_token_capable(token, CAP_PERFMON);
2315 }
2316
bpf_allow_uninit_stack(const struct bpf_token * token)2317 static inline bool bpf_allow_uninit_stack(const struct bpf_token *token)
2318 {
2319 return bpf_token_capable(token, CAP_PERFMON);
2320 }
2321
bpf_bypass_spec_v1(const struct bpf_token * token)2322 static inline bool bpf_bypass_spec_v1(const struct bpf_token *token)
2323 {
2324 return cpu_mitigations_off() || bpf_token_capable(token, CAP_PERFMON);
2325 }
2326
bpf_bypass_spec_v4(const struct bpf_token * token)2327 static inline bool bpf_bypass_spec_v4(const struct bpf_token *token)
2328 {
2329 return cpu_mitigations_off() || bpf_token_capable(token, CAP_PERFMON);
2330 }
2331
2332 int bpf_map_new_fd(struct bpf_map *map, int flags);
2333 int bpf_prog_new_fd(struct bpf_prog *prog);
2334
2335 void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
2336 const struct bpf_link_ops *ops, struct bpf_prog *prog);
2337 int bpf_link_prime(struct bpf_link *link, struct bpf_link_primer *primer);
2338 int bpf_link_settle(struct bpf_link_primer *primer);
2339 void bpf_link_cleanup(struct bpf_link_primer *primer);
2340 void bpf_link_inc(struct bpf_link *link);
2341 struct bpf_link *bpf_link_inc_not_zero(struct bpf_link *link);
2342 void bpf_link_put(struct bpf_link *link);
2343 int bpf_link_new_fd(struct bpf_link *link);
2344 struct bpf_link *bpf_link_get_from_fd(u32 ufd);
2345 struct bpf_link *bpf_link_get_curr_or_next(u32 *id);
2346
2347 void bpf_token_inc(struct bpf_token *token);
2348 void bpf_token_put(struct bpf_token *token);
2349 int bpf_token_create(union bpf_attr *attr);
2350 struct bpf_token *bpf_token_get_from_fd(u32 ufd);
2351
2352 bool bpf_token_allow_cmd(const struct bpf_token *token, enum bpf_cmd cmd);
2353 bool bpf_token_allow_map_type(const struct bpf_token *token, enum bpf_map_type type);
2354 bool bpf_token_allow_prog_type(const struct bpf_token *token,
2355 enum bpf_prog_type prog_type,
2356 enum bpf_attach_type attach_type);
2357
2358 int bpf_obj_pin_user(u32 ufd, int path_fd, const char __user *pathname);
2359 int bpf_obj_get_user(int path_fd, const char __user *pathname, int flags);
2360 struct inode *bpf_get_inode(struct super_block *sb, const struct inode *dir,
2361 umode_t mode);
2362
2363 #define BPF_ITER_FUNC_PREFIX "bpf_iter_"
2364 #define DEFINE_BPF_ITER_FUNC(target, args...) \
2365 extern int bpf_iter_ ## target(args); \
2366 int __init bpf_iter_ ## target(args) { return 0; }
2367
2368 /*
2369 * The task type of iterators.
2370 *
2371 * For BPF task iterators, they can be parameterized with various
2372 * parameters to visit only some of tasks.
2373 *
2374 * BPF_TASK_ITER_ALL (default)
2375 * Iterate over resources of every task.
2376 *
2377 * BPF_TASK_ITER_TID
2378 * Iterate over resources of a task/tid.
2379 *
2380 * BPF_TASK_ITER_TGID
2381 * Iterate over resources of every task of a process / task group.
2382 */
2383 enum bpf_iter_task_type {
2384 BPF_TASK_ITER_ALL = 0,
2385 BPF_TASK_ITER_TID,
2386 BPF_TASK_ITER_TGID,
2387 };
2388
2389 struct bpf_iter_aux_info {
2390 /* for map_elem iter */
2391 struct bpf_map *map;
2392
2393 /* for cgroup iter */
2394 struct {
2395 struct cgroup *start; /* starting cgroup */
2396 enum bpf_cgroup_iter_order order;
2397 } cgroup;
2398 struct {
2399 enum bpf_iter_task_type type;
2400 u32 pid;
2401 } task;
2402 };
2403
2404 typedef int (*bpf_iter_attach_target_t)(struct bpf_prog *prog,
2405 union bpf_iter_link_info *linfo,
2406 struct bpf_iter_aux_info *aux);
2407 typedef void (*bpf_iter_detach_target_t)(struct bpf_iter_aux_info *aux);
2408 typedef void (*bpf_iter_show_fdinfo_t) (const struct bpf_iter_aux_info *aux,
2409 struct seq_file *seq);
2410 typedef int (*bpf_iter_fill_link_info_t)(const struct bpf_iter_aux_info *aux,
2411 struct bpf_link_info *info);
2412 typedef const struct bpf_func_proto *
2413 (*bpf_iter_get_func_proto_t)(enum bpf_func_id func_id,
2414 const struct bpf_prog *prog);
2415
2416 enum bpf_iter_feature {
2417 BPF_ITER_RESCHED = BIT(0),
2418 };
2419
2420 #define BPF_ITER_CTX_ARG_MAX 2
2421 struct bpf_iter_reg {
2422 const char *target;
2423 bpf_iter_attach_target_t attach_target;
2424 bpf_iter_detach_target_t detach_target;
2425 bpf_iter_show_fdinfo_t show_fdinfo;
2426 bpf_iter_fill_link_info_t fill_link_info;
2427 bpf_iter_get_func_proto_t get_func_proto;
2428 u32 ctx_arg_info_size;
2429 u32 feature;
2430 struct bpf_ctx_arg_aux ctx_arg_info[BPF_ITER_CTX_ARG_MAX];
2431 const struct bpf_iter_seq_info *seq_info;
2432 };
2433
2434 struct bpf_iter_meta {
2435 __bpf_md_ptr(struct seq_file *, seq);
2436 u64 session_id;
2437 u64 seq_num;
2438 };
2439
2440 struct bpf_iter__bpf_map_elem {
2441 __bpf_md_ptr(struct bpf_iter_meta *, meta);
2442 __bpf_md_ptr(struct bpf_map *, map);
2443 __bpf_md_ptr(void *, key);
2444 __bpf_md_ptr(void *, value);
2445 };
2446
2447 int bpf_iter_reg_target(const struct bpf_iter_reg *reg_info);
2448 void bpf_iter_unreg_target(const struct bpf_iter_reg *reg_info);
2449 bool bpf_iter_prog_supported(struct bpf_prog *prog);
2450 const struct bpf_func_proto *
2451 bpf_iter_get_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog);
2452 int bpf_iter_link_attach(const union bpf_attr *attr, bpfptr_t uattr, struct bpf_prog *prog);
2453 int bpf_iter_new_fd(struct bpf_link *link);
2454 bool bpf_link_is_iter(struct bpf_link *link);
2455 struct bpf_prog *bpf_iter_get_info(struct bpf_iter_meta *meta, bool in_stop);
2456 int bpf_iter_run_prog(struct bpf_prog *prog, void *ctx);
2457 void bpf_iter_map_show_fdinfo(const struct bpf_iter_aux_info *aux,
2458 struct seq_file *seq);
2459 int bpf_iter_map_fill_link_info(const struct bpf_iter_aux_info *aux,
2460 struct bpf_link_info *info);
2461
2462 int map_set_for_each_callback_args(struct bpf_verifier_env *env,
2463 struct bpf_func_state *caller,
2464 struct bpf_func_state *callee);
2465
2466 int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value);
2467 int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value);
2468 int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value,
2469 u64 flags);
2470 int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value,
2471 u64 flags);
2472
2473 int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value);
2474
2475 int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file,
2476 void *key, void *value, u64 map_flags);
2477 int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
2478 int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file,
2479 void *key, void *value, u64 map_flags);
2480 int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
2481
2482 int bpf_get_file_flag(int flags);
2483 int bpf_check_uarg_tail_zero(bpfptr_t uaddr, size_t expected_size,
2484 size_t actual_size);
2485
2486 /* verify correctness of eBPF program */
2487 int bpf_check(struct bpf_prog **fp, union bpf_attr *attr, bpfptr_t uattr, u32 uattr_size);
2488
2489 #ifndef CONFIG_BPF_JIT_ALWAYS_ON
2490 void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth);
2491 #endif
2492
2493 struct btf *bpf_get_btf_vmlinux(void);
2494
2495 /* Map specifics */
2496 struct xdp_frame;
2497 struct sk_buff;
2498 struct bpf_dtab_netdev;
2499 struct bpf_cpu_map_entry;
2500
2501 void __dev_flush(struct list_head *flush_list);
2502 int dev_xdp_enqueue(struct net_device *dev, struct xdp_frame *xdpf,
2503 struct net_device *dev_rx);
2504 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_frame *xdpf,
2505 struct net_device *dev_rx);
2506 int dev_map_enqueue_multi(struct xdp_frame *xdpf, struct net_device *dev_rx,
2507 struct bpf_map *map, bool exclude_ingress);
2508 int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, struct sk_buff *skb,
2509 struct bpf_prog *xdp_prog);
2510 int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb,
2511 struct bpf_prog *xdp_prog, struct bpf_map *map,
2512 bool exclude_ingress);
2513
2514 void __cpu_map_flush(struct list_head *flush_list);
2515 int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_frame *xdpf,
2516 struct net_device *dev_rx);
2517 int cpu_map_generic_redirect(struct bpf_cpu_map_entry *rcpu,
2518 struct sk_buff *skb);
2519
2520 /* Return map's numa specified by userspace */
bpf_map_attr_numa_node(const union bpf_attr * attr)2521 static inline int bpf_map_attr_numa_node(const union bpf_attr *attr)
2522 {
2523 return (attr->map_flags & BPF_F_NUMA_NODE) ?
2524 attr->numa_node : NUMA_NO_NODE;
2525 }
2526
2527 struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type);
2528 int array_map_alloc_check(union bpf_attr *attr);
2529
2530 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
2531 union bpf_attr __user *uattr);
2532 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
2533 union bpf_attr __user *uattr);
2534 int bpf_prog_test_run_tracing(struct bpf_prog *prog,
2535 const union bpf_attr *kattr,
2536 union bpf_attr __user *uattr);
2537 int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
2538 const union bpf_attr *kattr,
2539 union bpf_attr __user *uattr);
2540 int bpf_prog_test_run_raw_tp(struct bpf_prog *prog,
2541 const union bpf_attr *kattr,
2542 union bpf_attr __user *uattr);
2543 int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog,
2544 const union bpf_attr *kattr,
2545 union bpf_attr __user *uattr);
2546 int bpf_prog_test_run_nf(struct bpf_prog *prog,
2547 const union bpf_attr *kattr,
2548 union bpf_attr __user *uattr);
2549 bool btf_ctx_access(int off, int size, enum bpf_access_type type,
2550 const struct bpf_prog *prog,
2551 struct bpf_insn_access_aux *info);
2552
bpf_tracing_ctx_access(int off,int size,enum bpf_access_type type)2553 static inline bool bpf_tracing_ctx_access(int off, int size,
2554 enum bpf_access_type type)
2555 {
2556 if (off < 0 || off >= sizeof(__u64) * MAX_BPF_FUNC_ARGS)
2557 return false;
2558 if (type != BPF_READ)
2559 return false;
2560 if (off % size != 0)
2561 return false;
2562 return true;
2563 }
2564
bpf_tracing_btf_ctx_access(int off,int size,enum bpf_access_type type,const struct bpf_prog * prog,struct bpf_insn_access_aux * info)2565 static inline bool bpf_tracing_btf_ctx_access(int off, int size,
2566 enum bpf_access_type type,
2567 const struct bpf_prog *prog,
2568 struct bpf_insn_access_aux *info)
2569 {
2570 if (!bpf_tracing_ctx_access(off, size, type))
2571 return false;
2572 return btf_ctx_access(off, size, type, prog, info);
2573 }
2574
2575 int btf_struct_access(struct bpf_verifier_log *log,
2576 const struct bpf_reg_state *reg,
2577 int off, int size, enum bpf_access_type atype,
2578 u32 *next_btf_id, enum bpf_type_flag *flag, const char **field_name);
2579 bool btf_struct_ids_match(struct bpf_verifier_log *log,
2580 const struct btf *btf, u32 id, int off,
2581 const struct btf *need_btf, u32 need_type_id,
2582 bool strict);
2583
2584 int btf_distill_func_proto(struct bpf_verifier_log *log,
2585 struct btf *btf,
2586 const struct btf_type *func_proto,
2587 const char *func_name,
2588 struct btf_func_model *m);
2589
2590 struct bpf_reg_state;
2591 int btf_prepare_func_args(struct bpf_verifier_env *env, int subprog);
2592 int btf_check_type_match(struct bpf_verifier_log *log, const struct bpf_prog *prog,
2593 struct btf *btf, const struct btf_type *t);
2594 const char *btf_find_decl_tag_value(const struct btf *btf, const struct btf_type *pt,
2595 int comp_idx, const char *tag_key);
2596 int btf_find_next_decl_tag(const struct btf *btf, const struct btf_type *pt,
2597 int comp_idx, const char *tag_key, int last_id);
2598
2599 struct bpf_prog *bpf_prog_by_id(u32 id);
2600 struct bpf_link *bpf_link_by_id(u32 id);
2601
2602 const struct bpf_func_proto *bpf_base_func_proto(enum bpf_func_id func_id,
2603 const struct bpf_prog *prog);
2604 void bpf_task_storage_free(struct task_struct *task);
2605 void bpf_cgrp_storage_free(struct cgroup *cgroup);
2606 bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog);
2607 const struct btf_func_model *
2608 bpf_jit_find_kfunc_model(const struct bpf_prog *prog,
2609 const struct bpf_insn *insn);
2610 int bpf_get_kfunc_addr(const struct bpf_prog *prog, u32 func_id,
2611 u16 btf_fd_idx, u8 **func_addr);
2612
2613 struct bpf_core_ctx {
2614 struct bpf_verifier_log *log;
2615 const struct btf *btf;
2616 };
2617
2618 bool btf_nested_type_is_trusted(struct bpf_verifier_log *log,
2619 const struct bpf_reg_state *reg,
2620 const char *field_name, u32 btf_id, const char *suffix);
2621
2622 bool btf_type_ids_nocast_alias(struct bpf_verifier_log *log,
2623 const struct btf *reg_btf, u32 reg_id,
2624 const struct btf *arg_btf, u32 arg_id);
2625
2626 int bpf_core_apply(struct bpf_core_ctx *ctx, const struct bpf_core_relo *relo,
2627 int relo_idx, void *insn);
2628
unprivileged_ebpf_enabled(void)2629 static inline bool unprivileged_ebpf_enabled(void)
2630 {
2631 return !sysctl_unprivileged_bpf_disabled;
2632 }
2633
2634 /* Not all bpf prog type has the bpf_ctx.
2635 * For the bpf prog type that has initialized the bpf_ctx,
2636 * this function can be used to decide if a kernel function
2637 * is called by a bpf program.
2638 */
has_current_bpf_ctx(void)2639 static inline bool has_current_bpf_ctx(void)
2640 {
2641 return !!current->bpf_ctx;
2642 }
2643
2644 void notrace bpf_prog_inc_misses_counter(struct bpf_prog *prog);
2645
2646 void bpf_dynptr_init(struct bpf_dynptr_kern *ptr, void *data,
2647 enum bpf_dynptr_type type, u32 offset, u32 size);
2648 void bpf_dynptr_set_null(struct bpf_dynptr_kern *ptr);
2649 void bpf_dynptr_set_rdonly(struct bpf_dynptr_kern *ptr);
2650
2651 #else /* !CONFIG_BPF_SYSCALL */
bpf_prog_get(u32 ufd)2652 static inline struct bpf_prog *bpf_prog_get(u32 ufd)
2653 {
2654 return ERR_PTR(-EOPNOTSUPP);
2655 }
2656
bpf_prog_get_type_dev(u32 ufd,enum bpf_prog_type type,bool attach_drv)2657 static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd,
2658 enum bpf_prog_type type,
2659 bool attach_drv)
2660 {
2661 return ERR_PTR(-EOPNOTSUPP);
2662 }
2663
bpf_prog_add(struct bpf_prog * prog,int i)2664 static inline void bpf_prog_add(struct bpf_prog *prog, int i)
2665 {
2666 }
2667
bpf_prog_sub(struct bpf_prog * prog,int i)2668 static inline void bpf_prog_sub(struct bpf_prog *prog, int i)
2669 {
2670 }
2671
bpf_prog_put(struct bpf_prog * prog)2672 static inline void bpf_prog_put(struct bpf_prog *prog)
2673 {
2674 }
2675
bpf_prog_inc(struct bpf_prog * prog)2676 static inline void bpf_prog_inc(struct bpf_prog *prog)
2677 {
2678 }
2679
2680 static inline struct bpf_prog *__must_check
bpf_prog_inc_not_zero(struct bpf_prog * prog)2681 bpf_prog_inc_not_zero(struct bpf_prog *prog)
2682 {
2683 return ERR_PTR(-EOPNOTSUPP);
2684 }
2685
bpf_link_init(struct bpf_link * link,enum bpf_link_type type,const struct bpf_link_ops * ops,struct bpf_prog * prog)2686 static inline void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
2687 const struct bpf_link_ops *ops,
2688 struct bpf_prog *prog)
2689 {
2690 }
2691
bpf_link_prime(struct bpf_link * link,struct bpf_link_primer * primer)2692 static inline int bpf_link_prime(struct bpf_link *link,
2693 struct bpf_link_primer *primer)
2694 {
2695 return -EOPNOTSUPP;
2696 }
2697
bpf_link_settle(struct bpf_link_primer * primer)2698 static inline int bpf_link_settle(struct bpf_link_primer *primer)
2699 {
2700 return -EOPNOTSUPP;
2701 }
2702
bpf_link_cleanup(struct bpf_link_primer * primer)2703 static inline void bpf_link_cleanup(struct bpf_link_primer *primer)
2704 {
2705 }
2706
bpf_link_inc(struct bpf_link * link)2707 static inline void bpf_link_inc(struct bpf_link *link)
2708 {
2709 }
2710
bpf_link_inc_not_zero(struct bpf_link * link)2711 static inline struct bpf_link *bpf_link_inc_not_zero(struct bpf_link *link)
2712 {
2713 return NULL;
2714 }
2715
bpf_link_put(struct bpf_link * link)2716 static inline void bpf_link_put(struct bpf_link *link)
2717 {
2718 }
2719
bpf_obj_get_user(const char __user * pathname,int flags)2720 static inline int bpf_obj_get_user(const char __user *pathname, int flags)
2721 {
2722 return -EOPNOTSUPP;
2723 }
2724
bpf_token_capable(const struct bpf_token * token,int cap)2725 static inline bool bpf_token_capable(const struct bpf_token *token, int cap)
2726 {
2727 return capable(cap) || (cap != CAP_SYS_ADMIN && capable(CAP_SYS_ADMIN));
2728 }
2729
bpf_token_inc(struct bpf_token * token)2730 static inline void bpf_token_inc(struct bpf_token *token)
2731 {
2732 }
2733
bpf_token_put(struct bpf_token * token)2734 static inline void bpf_token_put(struct bpf_token *token)
2735 {
2736 }
2737
bpf_token_get_from_fd(u32 ufd)2738 static inline struct bpf_token *bpf_token_get_from_fd(u32 ufd)
2739 {
2740 return ERR_PTR(-EOPNOTSUPP);
2741 }
2742
__dev_flush(struct list_head * flush_list)2743 static inline void __dev_flush(struct list_head *flush_list)
2744 {
2745 }
2746
2747 struct xdp_frame;
2748 struct bpf_dtab_netdev;
2749 struct bpf_cpu_map_entry;
2750
2751 static inline
dev_xdp_enqueue(struct net_device * dev,struct xdp_frame * xdpf,struct net_device * dev_rx)2752 int dev_xdp_enqueue(struct net_device *dev, struct xdp_frame *xdpf,
2753 struct net_device *dev_rx)
2754 {
2755 return 0;
2756 }
2757
2758 static inline
dev_map_enqueue(struct bpf_dtab_netdev * dst,struct xdp_frame * xdpf,struct net_device * dev_rx)2759 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_frame *xdpf,
2760 struct net_device *dev_rx)
2761 {
2762 return 0;
2763 }
2764
2765 static inline
dev_map_enqueue_multi(struct xdp_frame * xdpf,struct net_device * dev_rx,struct bpf_map * map,bool exclude_ingress)2766 int dev_map_enqueue_multi(struct xdp_frame *xdpf, struct net_device *dev_rx,
2767 struct bpf_map *map, bool exclude_ingress)
2768 {
2769 return 0;
2770 }
2771
2772 struct sk_buff;
2773
dev_map_generic_redirect(struct bpf_dtab_netdev * dst,struct sk_buff * skb,struct bpf_prog * xdp_prog)2774 static inline int dev_map_generic_redirect(struct bpf_dtab_netdev *dst,
2775 struct sk_buff *skb,
2776 struct bpf_prog *xdp_prog)
2777 {
2778 return 0;
2779 }
2780
2781 static inline
dev_map_redirect_multi(struct net_device * dev,struct sk_buff * skb,struct bpf_prog * xdp_prog,struct bpf_map * map,bool exclude_ingress)2782 int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb,
2783 struct bpf_prog *xdp_prog, struct bpf_map *map,
2784 bool exclude_ingress)
2785 {
2786 return 0;
2787 }
2788
__cpu_map_flush(struct list_head * flush_list)2789 static inline void __cpu_map_flush(struct list_head *flush_list)
2790 {
2791 }
2792
cpu_map_enqueue(struct bpf_cpu_map_entry * rcpu,struct xdp_frame * xdpf,struct net_device * dev_rx)2793 static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu,
2794 struct xdp_frame *xdpf,
2795 struct net_device *dev_rx)
2796 {
2797 return 0;
2798 }
2799
cpu_map_generic_redirect(struct bpf_cpu_map_entry * rcpu,struct sk_buff * skb)2800 static inline int cpu_map_generic_redirect(struct bpf_cpu_map_entry *rcpu,
2801 struct sk_buff *skb)
2802 {
2803 return -EOPNOTSUPP;
2804 }
2805
bpf_prog_get_type_path(const char * name,enum bpf_prog_type type)2806 static inline struct bpf_prog *bpf_prog_get_type_path(const char *name,
2807 enum bpf_prog_type type)
2808 {
2809 return ERR_PTR(-EOPNOTSUPP);
2810 }
2811
bpf_prog_test_run_xdp(struct bpf_prog * prog,const union bpf_attr * kattr,union bpf_attr __user * uattr)2812 static inline int bpf_prog_test_run_xdp(struct bpf_prog *prog,
2813 const union bpf_attr *kattr,
2814 union bpf_attr __user *uattr)
2815 {
2816 return -ENOTSUPP;
2817 }
2818
bpf_prog_test_run_skb(struct bpf_prog * prog,const union bpf_attr * kattr,union bpf_attr __user * uattr)2819 static inline int bpf_prog_test_run_skb(struct bpf_prog *prog,
2820 const union bpf_attr *kattr,
2821 union bpf_attr __user *uattr)
2822 {
2823 return -ENOTSUPP;
2824 }
2825
bpf_prog_test_run_tracing(struct bpf_prog * prog,const union bpf_attr * kattr,union bpf_attr __user * uattr)2826 static inline int bpf_prog_test_run_tracing(struct bpf_prog *prog,
2827 const union bpf_attr *kattr,
2828 union bpf_attr __user *uattr)
2829 {
2830 return -ENOTSUPP;
2831 }
2832
bpf_prog_test_run_flow_dissector(struct bpf_prog * prog,const union bpf_attr * kattr,union bpf_attr __user * uattr)2833 static inline int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
2834 const union bpf_attr *kattr,
2835 union bpf_attr __user *uattr)
2836 {
2837 return -ENOTSUPP;
2838 }
2839
bpf_prog_test_run_sk_lookup(struct bpf_prog * prog,const union bpf_attr * kattr,union bpf_attr __user * uattr)2840 static inline int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog,
2841 const union bpf_attr *kattr,
2842 union bpf_attr __user *uattr)
2843 {
2844 return -ENOTSUPP;
2845 }
2846
bpf_map_put(struct bpf_map * map)2847 static inline void bpf_map_put(struct bpf_map *map)
2848 {
2849 }
2850
bpf_prog_by_id(u32 id)2851 static inline struct bpf_prog *bpf_prog_by_id(u32 id)
2852 {
2853 return ERR_PTR(-ENOTSUPP);
2854 }
2855
btf_struct_access(struct bpf_verifier_log * log,const struct bpf_reg_state * reg,int off,int size,enum bpf_access_type atype,u32 * next_btf_id,enum bpf_type_flag * flag,const char ** field_name)2856 static inline int btf_struct_access(struct bpf_verifier_log *log,
2857 const struct bpf_reg_state *reg,
2858 int off, int size, enum bpf_access_type atype,
2859 u32 *next_btf_id, enum bpf_type_flag *flag,
2860 const char **field_name)
2861 {
2862 return -EACCES;
2863 }
2864
2865 static inline const struct bpf_func_proto *
bpf_base_func_proto(enum bpf_func_id func_id,const struct bpf_prog * prog)2866 bpf_base_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
2867 {
2868 return NULL;
2869 }
2870
bpf_task_storage_free(struct task_struct * task)2871 static inline void bpf_task_storage_free(struct task_struct *task)
2872 {
2873 }
2874
bpf_prog_has_kfunc_call(const struct bpf_prog * prog)2875 static inline bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog)
2876 {
2877 return false;
2878 }
2879
2880 static inline const struct btf_func_model *
bpf_jit_find_kfunc_model(const struct bpf_prog * prog,const struct bpf_insn * insn)2881 bpf_jit_find_kfunc_model(const struct bpf_prog *prog,
2882 const struct bpf_insn *insn)
2883 {
2884 return NULL;
2885 }
2886
2887 static inline int
bpf_get_kfunc_addr(const struct bpf_prog * prog,u32 func_id,u16 btf_fd_idx,u8 ** func_addr)2888 bpf_get_kfunc_addr(const struct bpf_prog *prog, u32 func_id,
2889 u16 btf_fd_idx, u8 **func_addr)
2890 {
2891 return -ENOTSUPP;
2892 }
2893
unprivileged_ebpf_enabled(void)2894 static inline bool unprivileged_ebpf_enabled(void)
2895 {
2896 return false;
2897 }
2898
has_current_bpf_ctx(void)2899 static inline bool has_current_bpf_ctx(void)
2900 {
2901 return false;
2902 }
2903
bpf_prog_inc_misses_counter(struct bpf_prog * prog)2904 static inline void bpf_prog_inc_misses_counter(struct bpf_prog *prog)
2905 {
2906 }
2907
bpf_cgrp_storage_free(struct cgroup * cgroup)2908 static inline void bpf_cgrp_storage_free(struct cgroup *cgroup)
2909 {
2910 }
2911
bpf_dynptr_init(struct bpf_dynptr_kern * ptr,void * data,enum bpf_dynptr_type type,u32 offset,u32 size)2912 static inline void bpf_dynptr_init(struct bpf_dynptr_kern *ptr, void *data,
2913 enum bpf_dynptr_type type, u32 offset, u32 size)
2914 {
2915 }
2916
bpf_dynptr_set_null(struct bpf_dynptr_kern * ptr)2917 static inline void bpf_dynptr_set_null(struct bpf_dynptr_kern *ptr)
2918 {
2919 }
2920
bpf_dynptr_set_rdonly(struct bpf_dynptr_kern * ptr)2921 static inline void bpf_dynptr_set_rdonly(struct bpf_dynptr_kern *ptr)
2922 {
2923 }
2924 #endif /* CONFIG_BPF_SYSCALL */
2925
2926 static __always_inline int
bpf_probe_read_kernel_common(void * dst,u32 size,const void * unsafe_ptr)2927 bpf_probe_read_kernel_common(void *dst, u32 size, const void *unsafe_ptr)
2928 {
2929 int ret = -EFAULT;
2930
2931 if (IS_ENABLED(CONFIG_BPF_EVENTS))
2932 ret = copy_from_kernel_nofault(dst, unsafe_ptr, size);
2933 if (unlikely(ret < 0))
2934 memset(dst, 0, size);
2935 return ret;
2936 }
2937
2938 void __bpf_free_used_btfs(struct btf_mod_pair *used_btfs, u32 len);
2939
bpf_prog_get_type(u32 ufd,enum bpf_prog_type type)2940 static inline struct bpf_prog *bpf_prog_get_type(u32 ufd,
2941 enum bpf_prog_type type)
2942 {
2943 return bpf_prog_get_type_dev(ufd, type, false);
2944 }
2945
2946 void __bpf_free_used_maps(struct bpf_prog_aux *aux,
2947 struct bpf_map **used_maps, u32 len);
2948
2949 bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool);
2950
2951 int bpf_prog_offload_compile(struct bpf_prog *prog);
2952 void bpf_prog_dev_bound_destroy(struct bpf_prog *prog);
2953 int bpf_prog_offload_info_fill(struct bpf_prog_info *info,
2954 struct bpf_prog *prog);
2955
2956 int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map);
2957
2958 int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value);
2959 int bpf_map_offload_update_elem(struct bpf_map *map,
2960 void *key, void *value, u64 flags);
2961 int bpf_map_offload_delete_elem(struct bpf_map *map, void *key);
2962 int bpf_map_offload_get_next_key(struct bpf_map *map,
2963 void *key, void *next_key);
2964
2965 bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map);
2966
2967 struct bpf_offload_dev *
2968 bpf_offload_dev_create(const struct bpf_prog_offload_ops *ops, void *priv);
2969 void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev);
2970 void *bpf_offload_dev_priv(struct bpf_offload_dev *offdev);
2971 int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev,
2972 struct net_device *netdev);
2973 void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev,
2974 struct net_device *netdev);
2975 bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev);
2976
2977 void unpriv_ebpf_notify(int new_state);
2978
2979 #if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL)
2980 int bpf_dev_bound_kfunc_check(struct bpf_verifier_log *log,
2981 struct bpf_prog_aux *prog_aux);
2982 void *bpf_dev_bound_resolve_kfunc(struct bpf_prog *prog, u32 func_id);
2983 int bpf_prog_dev_bound_init(struct bpf_prog *prog, union bpf_attr *attr);
2984 int bpf_prog_dev_bound_inherit(struct bpf_prog *new_prog, struct bpf_prog *old_prog);
2985 void bpf_dev_bound_netdev_unregister(struct net_device *dev);
2986
bpf_prog_is_dev_bound(const struct bpf_prog_aux * aux)2987 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux)
2988 {
2989 return aux->dev_bound;
2990 }
2991
bpf_prog_is_offloaded(const struct bpf_prog_aux * aux)2992 static inline bool bpf_prog_is_offloaded(const struct bpf_prog_aux *aux)
2993 {
2994 return aux->offload_requested;
2995 }
2996
2997 bool bpf_prog_dev_bound_match(const struct bpf_prog *lhs, const struct bpf_prog *rhs);
2998
bpf_map_is_offloaded(struct bpf_map * map)2999 static inline bool bpf_map_is_offloaded(struct bpf_map *map)
3000 {
3001 return unlikely(map->ops == &bpf_map_offload_ops);
3002 }
3003
3004 struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr);
3005 void bpf_map_offload_map_free(struct bpf_map *map);
3006 u64 bpf_map_offload_map_mem_usage(const struct bpf_map *map);
3007 int bpf_prog_test_run_syscall(struct bpf_prog *prog,
3008 const union bpf_attr *kattr,
3009 union bpf_attr __user *uattr);
3010
3011 int sock_map_get_from_fd(const union bpf_attr *attr, struct bpf_prog *prog);
3012 int sock_map_prog_detach(const union bpf_attr *attr, enum bpf_prog_type ptype);
3013 int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value, u64 flags);
3014 int sock_map_bpf_prog_query(const union bpf_attr *attr,
3015 union bpf_attr __user *uattr);
3016 int sock_map_link_create(const union bpf_attr *attr, struct bpf_prog *prog);
3017
3018 void sock_map_unhash(struct sock *sk);
3019 void sock_map_destroy(struct sock *sk);
3020 void sock_map_close(struct sock *sk, long timeout);
3021 #else
bpf_dev_bound_kfunc_check(struct bpf_verifier_log * log,struct bpf_prog_aux * prog_aux)3022 static inline int bpf_dev_bound_kfunc_check(struct bpf_verifier_log *log,
3023 struct bpf_prog_aux *prog_aux)
3024 {
3025 return -EOPNOTSUPP;
3026 }
3027
bpf_dev_bound_resolve_kfunc(struct bpf_prog * prog,u32 func_id)3028 static inline void *bpf_dev_bound_resolve_kfunc(struct bpf_prog *prog,
3029 u32 func_id)
3030 {
3031 return NULL;
3032 }
3033
bpf_prog_dev_bound_init(struct bpf_prog * prog,union bpf_attr * attr)3034 static inline int bpf_prog_dev_bound_init(struct bpf_prog *prog,
3035 union bpf_attr *attr)
3036 {
3037 return -EOPNOTSUPP;
3038 }
3039
bpf_prog_dev_bound_inherit(struct bpf_prog * new_prog,struct bpf_prog * old_prog)3040 static inline int bpf_prog_dev_bound_inherit(struct bpf_prog *new_prog,
3041 struct bpf_prog *old_prog)
3042 {
3043 return -EOPNOTSUPP;
3044 }
3045
bpf_dev_bound_netdev_unregister(struct net_device * dev)3046 static inline void bpf_dev_bound_netdev_unregister(struct net_device *dev)
3047 {
3048 }
3049
bpf_prog_is_dev_bound(const struct bpf_prog_aux * aux)3050 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux)
3051 {
3052 return false;
3053 }
3054
bpf_prog_is_offloaded(struct bpf_prog_aux * aux)3055 static inline bool bpf_prog_is_offloaded(struct bpf_prog_aux *aux)
3056 {
3057 return false;
3058 }
3059
bpf_prog_dev_bound_match(const struct bpf_prog * lhs,const struct bpf_prog * rhs)3060 static inline bool bpf_prog_dev_bound_match(const struct bpf_prog *lhs, const struct bpf_prog *rhs)
3061 {
3062 return false;
3063 }
3064
bpf_map_is_offloaded(struct bpf_map * map)3065 static inline bool bpf_map_is_offloaded(struct bpf_map *map)
3066 {
3067 return false;
3068 }
3069
bpf_map_offload_map_alloc(union bpf_attr * attr)3070 static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr)
3071 {
3072 return ERR_PTR(-EOPNOTSUPP);
3073 }
3074
bpf_map_offload_map_free(struct bpf_map * map)3075 static inline void bpf_map_offload_map_free(struct bpf_map *map)
3076 {
3077 }
3078
bpf_map_offload_map_mem_usage(const struct bpf_map * map)3079 static inline u64 bpf_map_offload_map_mem_usage(const struct bpf_map *map)
3080 {
3081 return 0;
3082 }
3083
bpf_prog_test_run_syscall(struct bpf_prog * prog,const union bpf_attr * kattr,union bpf_attr __user * uattr)3084 static inline int bpf_prog_test_run_syscall(struct bpf_prog *prog,
3085 const union bpf_attr *kattr,
3086 union bpf_attr __user *uattr)
3087 {
3088 return -ENOTSUPP;
3089 }
3090
3091 #ifdef CONFIG_BPF_SYSCALL
sock_map_get_from_fd(const union bpf_attr * attr,struct bpf_prog * prog)3092 static inline int sock_map_get_from_fd(const union bpf_attr *attr,
3093 struct bpf_prog *prog)
3094 {
3095 return -EINVAL;
3096 }
3097
sock_map_prog_detach(const union bpf_attr * attr,enum bpf_prog_type ptype)3098 static inline int sock_map_prog_detach(const union bpf_attr *attr,
3099 enum bpf_prog_type ptype)
3100 {
3101 return -EOPNOTSUPP;
3102 }
3103
sock_map_update_elem_sys(struct bpf_map * map,void * key,void * value,u64 flags)3104 static inline int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value,
3105 u64 flags)
3106 {
3107 return -EOPNOTSUPP;
3108 }
3109
sock_map_bpf_prog_query(const union bpf_attr * attr,union bpf_attr __user * uattr)3110 static inline int sock_map_bpf_prog_query(const union bpf_attr *attr,
3111 union bpf_attr __user *uattr)
3112 {
3113 return -EINVAL;
3114 }
3115
sock_map_link_create(const union bpf_attr * attr,struct bpf_prog * prog)3116 static inline int sock_map_link_create(const union bpf_attr *attr, struct bpf_prog *prog)
3117 {
3118 return -EOPNOTSUPP;
3119 }
3120 #endif /* CONFIG_BPF_SYSCALL */
3121 #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */
3122
3123 static __always_inline void
bpf_prog_inc_misses_counters(const struct bpf_prog_array * array)3124 bpf_prog_inc_misses_counters(const struct bpf_prog_array *array)
3125 {
3126 const struct bpf_prog_array_item *item;
3127 struct bpf_prog *prog;
3128
3129 if (unlikely(!array))
3130 return;
3131
3132 item = &array->items[0];
3133 while ((prog = READ_ONCE(item->prog))) {
3134 bpf_prog_inc_misses_counter(prog);
3135 item++;
3136 }
3137 }
3138
3139 #if defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL)
3140 void bpf_sk_reuseport_detach(struct sock *sk);
3141 int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, void *key,
3142 void *value);
3143 int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, void *key,
3144 void *value, u64 map_flags);
3145 #else
bpf_sk_reuseport_detach(struct sock * sk)3146 static inline void bpf_sk_reuseport_detach(struct sock *sk)
3147 {
3148 }
3149
3150 #ifdef CONFIG_BPF_SYSCALL
bpf_fd_reuseport_array_lookup_elem(struct bpf_map * map,void * key,void * value)3151 static inline int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map,
3152 void *key, void *value)
3153 {
3154 return -EOPNOTSUPP;
3155 }
3156
bpf_fd_reuseport_array_update_elem(struct bpf_map * map,void * key,void * value,u64 map_flags)3157 static inline int bpf_fd_reuseport_array_update_elem(struct bpf_map *map,
3158 void *key, void *value,
3159 u64 map_flags)
3160 {
3161 return -EOPNOTSUPP;
3162 }
3163 #endif /* CONFIG_BPF_SYSCALL */
3164 #endif /* defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) */
3165
3166 /* verifier prototypes for helper functions called from eBPF programs */
3167 extern const struct bpf_func_proto bpf_map_lookup_elem_proto;
3168 extern const struct bpf_func_proto bpf_map_update_elem_proto;
3169 extern const struct bpf_func_proto bpf_map_delete_elem_proto;
3170 extern const struct bpf_func_proto bpf_map_push_elem_proto;
3171 extern const struct bpf_func_proto bpf_map_pop_elem_proto;
3172 extern const struct bpf_func_proto bpf_map_peek_elem_proto;
3173 extern const struct bpf_func_proto bpf_map_lookup_percpu_elem_proto;
3174
3175 extern const struct bpf_func_proto bpf_get_prandom_u32_proto;
3176 extern const struct bpf_func_proto bpf_get_smp_processor_id_proto;
3177 extern const struct bpf_func_proto bpf_get_numa_node_id_proto;
3178 extern const struct bpf_func_proto bpf_tail_call_proto;
3179 extern const struct bpf_func_proto bpf_ktime_get_ns_proto;
3180 extern const struct bpf_func_proto bpf_ktime_get_boot_ns_proto;
3181 extern const struct bpf_func_proto bpf_ktime_get_tai_ns_proto;
3182 extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto;
3183 extern const struct bpf_func_proto bpf_get_current_uid_gid_proto;
3184 extern const struct bpf_func_proto bpf_get_current_comm_proto;
3185 extern const struct bpf_func_proto bpf_get_stackid_proto;
3186 extern const struct bpf_func_proto bpf_get_stack_proto;
3187 extern const struct bpf_func_proto bpf_get_task_stack_proto;
3188 extern const struct bpf_func_proto bpf_get_stackid_proto_pe;
3189 extern const struct bpf_func_proto bpf_get_stack_proto_pe;
3190 extern const struct bpf_func_proto bpf_sock_map_update_proto;
3191 extern const struct bpf_func_proto bpf_sock_hash_update_proto;
3192 extern const struct bpf_func_proto bpf_get_current_cgroup_id_proto;
3193 extern const struct bpf_func_proto bpf_get_current_ancestor_cgroup_id_proto;
3194 extern const struct bpf_func_proto bpf_get_cgroup_classid_curr_proto;
3195 extern const struct bpf_func_proto bpf_msg_redirect_hash_proto;
3196 extern const struct bpf_func_proto bpf_msg_redirect_map_proto;
3197 extern const struct bpf_func_proto bpf_sk_redirect_hash_proto;
3198 extern const struct bpf_func_proto bpf_sk_redirect_map_proto;
3199 extern const struct bpf_func_proto bpf_spin_lock_proto;
3200 extern const struct bpf_func_proto bpf_spin_unlock_proto;
3201 extern const struct bpf_func_proto bpf_get_local_storage_proto;
3202 extern const struct bpf_func_proto bpf_strtol_proto;
3203 extern const struct bpf_func_proto bpf_strtoul_proto;
3204 extern const struct bpf_func_proto bpf_tcp_sock_proto;
3205 extern const struct bpf_func_proto bpf_jiffies64_proto;
3206 extern const struct bpf_func_proto bpf_get_ns_current_pid_tgid_proto;
3207 extern const struct bpf_func_proto bpf_event_output_data_proto;
3208 extern const struct bpf_func_proto bpf_ringbuf_output_proto;
3209 extern const struct bpf_func_proto bpf_ringbuf_reserve_proto;
3210 extern const struct bpf_func_proto bpf_ringbuf_submit_proto;
3211 extern const struct bpf_func_proto bpf_ringbuf_discard_proto;
3212 extern const struct bpf_func_proto bpf_ringbuf_query_proto;
3213 extern const struct bpf_func_proto bpf_ringbuf_reserve_dynptr_proto;
3214 extern const struct bpf_func_proto bpf_ringbuf_submit_dynptr_proto;
3215 extern const struct bpf_func_proto bpf_ringbuf_discard_dynptr_proto;
3216 extern const struct bpf_func_proto bpf_skc_to_tcp6_sock_proto;
3217 extern const struct bpf_func_proto bpf_skc_to_tcp_sock_proto;
3218 extern const struct bpf_func_proto bpf_skc_to_tcp_timewait_sock_proto;
3219 extern const struct bpf_func_proto bpf_skc_to_tcp_request_sock_proto;
3220 extern const struct bpf_func_proto bpf_skc_to_udp6_sock_proto;
3221 extern const struct bpf_func_proto bpf_skc_to_unix_sock_proto;
3222 extern const struct bpf_func_proto bpf_skc_to_mptcp_sock_proto;
3223 extern const struct bpf_func_proto bpf_copy_from_user_proto;
3224 extern const struct bpf_func_proto bpf_snprintf_btf_proto;
3225 extern const struct bpf_func_proto bpf_snprintf_proto;
3226 extern const struct bpf_func_proto bpf_per_cpu_ptr_proto;
3227 extern const struct bpf_func_proto bpf_this_cpu_ptr_proto;
3228 extern const struct bpf_func_proto bpf_ktime_get_coarse_ns_proto;
3229 extern const struct bpf_func_proto bpf_sock_from_file_proto;
3230 extern const struct bpf_func_proto bpf_get_socket_ptr_cookie_proto;
3231 extern const struct bpf_func_proto bpf_task_storage_get_recur_proto;
3232 extern const struct bpf_func_proto bpf_task_storage_get_proto;
3233 extern const struct bpf_func_proto bpf_task_storage_delete_recur_proto;
3234 extern const struct bpf_func_proto bpf_task_storage_delete_proto;
3235 extern const struct bpf_func_proto bpf_for_each_map_elem_proto;
3236 extern const struct bpf_func_proto bpf_btf_find_by_name_kind_proto;
3237 extern const struct bpf_func_proto bpf_sk_setsockopt_proto;
3238 extern const struct bpf_func_proto bpf_sk_getsockopt_proto;
3239 extern const struct bpf_func_proto bpf_unlocked_sk_setsockopt_proto;
3240 extern const struct bpf_func_proto bpf_unlocked_sk_getsockopt_proto;
3241 extern const struct bpf_func_proto bpf_find_vma_proto;
3242 extern const struct bpf_func_proto bpf_loop_proto;
3243 extern const struct bpf_func_proto bpf_copy_from_user_task_proto;
3244 extern const struct bpf_func_proto bpf_set_retval_proto;
3245 extern const struct bpf_func_proto bpf_get_retval_proto;
3246 extern const struct bpf_func_proto bpf_user_ringbuf_drain_proto;
3247 extern const struct bpf_func_proto bpf_cgrp_storage_get_proto;
3248 extern const struct bpf_func_proto bpf_cgrp_storage_delete_proto;
3249
3250 const struct bpf_func_proto *tracing_prog_func_proto(
3251 enum bpf_func_id func_id, const struct bpf_prog *prog);
3252
3253 /* Shared helpers among cBPF and eBPF. */
3254 void bpf_user_rnd_init_once(void);
3255 u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
3256 u64 bpf_get_raw_cpu_id(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
3257
3258 #if defined(CONFIG_NET)
3259 bool bpf_sock_common_is_valid_access(int off, int size,
3260 enum bpf_access_type type,
3261 struct bpf_insn_access_aux *info);
3262 bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type,
3263 struct bpf_insn_access_aux *info);
3264 u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
3265 const struct bpf_insn *si,
3266 struct bpf_insn *insn_buf,
3267 struct bpf_prog *prog,
3268 u32 *target_size);
3269 int bpf_dynptr_from_skb_rdonly(struct __sk_buff *skb, u64 flags,
3270 struct bpf_dynptr *ptr);
3271 #else
bpf_sock_common_is_valid_access(int off,int size,enum bpf_access_type type,struct bpf_insn_access_aux * info)3272 static inline bool bpf_sock_common_is_valid_access(int off, int size,
3273 enum bpf_access_type type,
3274 struct bpf_insn_access_aux *info)
3275 {
3276 return false;
3277 }
bpf_sock_is_valid_access(int off,int size,enum bpf_access_type type,struct bpf_insn_access_aux * info)3278 static inline bool bpf_sock_is_valid_access(int off, int size,
3279 enum bpf_access_type type,
3280 struct bpf_insn_access_aux *info)
3281 {
3282 return false;
3283 }
bpf_sock_convert_ctx_access(enum bpf_access_type type,const struct bpf_insn * si,struct bpf_insn * insn_buf,struct bpf_prog * prog,u32 * target_size)3284 static inline u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
3285 const struct bpf_insn *si,
3286 struct bpf_insn *insn_buf,
3287 struct bpf_prog *prog,
3288 u32 *target_size)
3289 {
3290 return 0;
3291 }
bpf_dynptr_from_skb_rdonly(struct __sk_buff * skb,u64 flags,struct bpf_dynptr * ptr)3292 static inline int bpf_dynptr_from_skb_rdonly(struct __sk_buff *skb, u64 flags,
3293 struct bpf_dynptr *ptr)
3294 {
3295 return -EOPNOTSUPP;
3296 }
3297 #endif
3298
3299 #ifdef CONFIG_INET
3300 struct sk_reuseport_kern {
3301 struct sk_buff *skb;
3302 struct sock *sk;
3303 struct sock *selected_sk;
3304 struct sock *migrating_sk;
3305 void *data_end;
3306 u32 hash;
3307 u32 reuseport_id;
3308 bool bind_inany;
3309 };
3310 bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
3311 struct bpf_insn_access_aux *info);
3312
3313 u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
3314 const struct bpf_insn *si,
3315 struct bpf_insn *insn_buf,
3316 struct bpf_prog *prog,
3317 u32 *target_size);
3318
3319 bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
3320 struct bpf_insn_access_aux *info);
3321
3322 u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
3323 const struct bpf_insn *si,
3324 struct bpf_insn *insn_buf,
3325 struct bpf_prog *prog,
3326 u32 *target_size);
3327 #else
bpf_tcp_sock_is_valid_access(int off,int size,enum bpf_access_type type,struct bpf_insn_access_aux * info)3328 static inline bool bpf_tcp_sock_is_valid_access(int off, int size,
3329 enum bpf_access_type type,
3330 struct bpf_insn_access_aux *info)
3331 {
3332 return false;
3333 }
3334
bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,const struct bpf_insn * si,struct bpf_insn * insn_buf,struct bpf_prog * prog,u32 * target_size)3335 static inline u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
3336 const struct bpf_insn *si,
3337 struct bpf_insn *insn_buf,
3338 struct bpf_prog *prog,
3339 u32 *target_size)
3340 {
3341 return 0;
3342 }
bpf_xdp_sock_is_valid_access(int off,int size,enum bpf_access_type type,struct bpf_insn_access_aux * info)3343 static inline bool bpf_xdp_sock_is_valid_access(int off, int size,
3344 enum bpf_access_type type,
3345 struct bpf_insn_access_aux *info)
3346 {
3347 return false;
3348 }
3349
bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,const struct bpf_insn * si,struct bpf_insn * insn_buf,struct bpf_prog * prog,u32 * target_size)3350 static inline u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
3351 const struct bpf_insn *si,
3352 struct bpf_insn *insn_buf,
3353 struct bpf_prog *prog,
3354 u32 *target_size)
3355 {
3356 return 0;
3357 }
3358 #endif /* CONFIG_INET */
3359
3360 enum bpf_text_poke_type {
3361 BPF_MOD_CALL,
3362 BPF_MOD_JUMP,
3363 };
3364
3365 int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type t,
3366 void *addr1, void *addr2);
3367
3368 void bpf_arch_poke_desc_update(struct bpf_jit_poke_descriptor *poke,
3369 struct bpf_prog *new, struct bpf_prog *old);
3370
3371 void *bpf_arch_text_copy(void *dst, void *src, size_t len);
3372 int bpf_arch_text_invalidate(void *dst, size_t len);
3373
3374 struct btf_id_set;
3375 bool btf_id_set_contains(const struct btf_id_set *set, u32 id);
3376
3377 #define MAX_BPRINTF_VARARGS 12
3378 #define MAX_BPRINTF_BUF 1024
3379
3380 struct bpf_bprintf_data {
3381 u32 *bin_args;
3382 char *buf;
3383 bool get_bin_args;
3384 bool get_buf;
3385 };
3386
3387 int bpf_bprintf_prepare(char *fmt, u32 fmt_size, const u64 *raw_args,
3388 u32 num_args, struct bpf_bprintf_data *data);
3389 void bpf_bprintf_cleanup(struct bpf_bprintf_data *data);
3390
3391 #ifdef CONFIG_BPF_LSM
3392 void bpf_cgroup_atype_get(u32 attach_btf_id, int cgroup_atype);
3393 void bpf_cgroup_atype_put(int cgroup_atype);
3394 #else
bpf_cgroup_atype_get(u32 attach_btf_id,int cgroup_atype)3395 static inline void bpf_cgroup_atype_get(u32 attach_btf_id, int cgroup_atype) {}
bpf_cgroup_atype_put(int cgroup_atype)3396 static inline void bpf_cgroup_atype_put(int cgroup_atype) {}
3397 #endif /* CONFIG_BPF_LSM */
3398
3399 struct key;
3400
3401 #ifdef CONFIG_KEYS
3402 struct bpf_key {
3403 struct key *key;
3404 bool has_ref;
3405 };
3406 #endif /* CONFIG_KEYS */
3407
type_is_alloc(u32 type)3408 static inline bool type_is_alloc(u32 type)
3409 {
3410 return type & MEM_ALLOC;
3411 }
3412
bpf_memcg_flags(gfp_t flags)3413 static inline gfp_t bpf_memcg_flags(gfp_t flags)
3414 {
3415 if (memcg_bpf_enabled())
3416 return flags | __GFP_ACCOUNT;
3417 return flags;
3418 }
3419
bpf_is_subprog(const struct bpf_prog * prog)3420 static inline bool bpf_is_subprog(const struct bpf_prog *prog)
3421 {
3422 return prog->aux->func_idx != 0;
3423 }
3424
3425 #endif /* _LINUX_BPF_H */
3426