Linux kernel mirror (for testing)
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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 <crypto/sha2.h>
11#include <linux/workqueue.h>
12#include <linux/file.h>
13#include <linux/percpu.h>
14#include <linux/err.h>
15#include <linux/rbtree_latch.h>
16#include <linux/numa.h>
17#include <linux/mm_types.h>
18#include <linux/wait.h>
19#include <linux/refcount.h>
20#include <linux/mutex.h>
21#include <linux/module.h>
22#include <linux/kallsyms.h>
23#include <linux/capability.h>
24#include <linux/sched/mm.h>
25#include <linux/slab.h>
26#include <linux/percpu-refcount.h>
27#include <linux/stddef.h>
28#include <linux/bpfptr.h>
29#include <linux/btf.h>
30#include <linux/rcupdate_trace.h>
31#include <linux/static_call.h>
32#include <linux/memcontrol.h>
33#include <linux/cfi.h>
34#include <asm/rqspinlock.h>
35
36struct bpf_verifier_env;
37struct bpf_verifier_log;
38struct perf_event;
39struct bpf_prog;
40struct bpf_prog_aux;
41struct bpf_map;
42struct bpf_arena;
43struct sock;
44struct seq_file;
45struct btf;
46struct btf_type;
47struct exception_table_entry;
48struct seq_operations;
49struct bpf_iter_aux_info;
50struct bpf_local_storage;
51struct bpf_local_storage_map;
52struct kobject;
53struct mem_cgroup;
54struct module;
55struct bpf_func_state;
56struct ftrace_ops;
57struct cgroup;
58struct bpf_token;
59struct user_namespace;
60struct super_block;
61struct inode;
62
63extern struct idr btf_idr;
64extern spinlock_t btf_idr_lock;
65extern struct kobject *btf_kobj;
66extern struct bpf_mem_alloc bpf_global_ma, bpf_global_percpu_ma;
67extern bool bpf_global_ma_set;
68
69typedef u64 (*bpf_callback_t)(u64, u64, u64, u64, u64);
70typedef int (*bpf_iter_init_seq_priv_t)(void *private_data,
71 struct bpf_iter_aux_info *aux);
72typedef void (*bpf_iter_fini_seq_priv_t)(void *private_data);
73typedef unsigned int (*bpf_func_t)(const void *,
74 const struct bpf_insn *);
75struct bpf_iter_seq_info {
76 const struct seq_operations *seq_ops;
77 bpf_iter_init_seq_priv_t init_seq_private;
78 bpf_iter_fini_seq_priv_t fini_seq_private;
79 u32 seq_priv_size;
80};
81
82/* map is generic key/value storage optionally accessible by eBPF programs */
83struct bpf_map_ops {
84 /* funcs callable from userspace (via syscall) */
85 int (*map_alloc_check)(union bpf_attr *attr);
86 struct bpf_map *(*map_alloc)(union bpf_attr *attr);
87 void (*map_release)(struct bpf_map *map, struct file *map_file);
88 void (*map_free)(struct bpf_map *map);
89 int (*map_get_next_key)(struct bpf_map *map, void *key, void *next_key);
90 void (*map_release_uref)(struct bpf_map *map);
91 void *(*map_lookup_elem_sys_only)(struct bpf_map *map, void *key);
92 int (*map_lookup_batch)(struct bpf_map *map, const union bpf_attr *attr,
93 union bpf_attr __user *uattr);
94 int (*map_lookup_and_delete_elem)(struct bpf_map *map, void *key,
95 void *value, u64 flags);
96 int (*map_lookup_and_delete_batch)(struct bpf_map *map,
97 const union bpf_attr *attr,
98 union bpf_attr __user *uattr);
99 int (*map_update_batch)(struct bpf_map *map, struct file *map_file,
100 const union bpf_attr *attr,
101 union bpf_attr __user *uattr);
102 int (*map_delete_batch)(struct bpf_map *map, const union bpf_attr *attr,
103 union bpf_attr __user *uattr);
104
105 /* funcs callable from userspace and from eBPF programs */
106 void *(*map_lookup_elem)(struct bpf_map *map, void *key);
107 long (*map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags);
108 long (*map_delete_elem)(struct bpf_map *map, void *key);
109 long (*map_push_elem)(struct bpf_map *map, void *value, u64 flags);
110 long (*map_pop_elem)(struct bpf_map *map, void *value);
111 long (*map_peek_elem)(struct bpf_map *map, void *value);
112 void *(*map_lookup_percpu_elem)(struct bpf_map *map, void *key, u32 cpu);
113 int (*map_get_hash)(struct bpf_map *map, u32 hash_buf_size, void *hash_buf);
114
115 /* funcs called by prog_array and perf_event_array map */
116 void *(*map_fd_get_ptr)(struct bpf_map *map, struct file *map_file,
117 int fd);
118 /* If need_defer is true, the implementation should guarantee that
119 * the to-be-put element is still alive before the bpf program, which
120 * may manipulate it, exists.
121 */
122 void (*map_fd_put_ptr)(struct bpf_map *map, void *ptr, bool need_defer);
123 int (*map_gen_lookup)(struct bpf_map *map, struct bpf_insn *insn_buf);
124 u32 (*map_fd_sys_lookup_elem)(void *ptr);
125 void (*map_seq_show_elem)(struct bpf_map *map, void *key,
126 struct seq_file *m);
127 int (*map_check_btf)(struct bpf_map *map,
128 const struct btf *btf,
129 const struct btf_type *key_type,
130 const struct btf_type *value_type);
131
132 /* Prog poke tracking helpers. */
133 int (*map_poke_track)(struct bpf_map *map, struct bpf_prog_aux *aux);
134 void (*map_poke_untrack)(struct bpf_map *map, struct bpf_prog_aux *aux);
135 void (*map_poke_run)(struct bpf_map *map, u32 key, struct bpf_prog *old,
136 struct bpf_prog *new);
137
138 /* Direct value access helpers. */
139 int (*map_direct_value_addr)(const struct bpf_map *map,
140 u64 *imm, u32 off);
141 int (*map_direct_value_meta)(const struct bpf_map *map,
142 u64 imm, u32 *off);
143 int (*map_mmap)(struct bpf_map *map, struct vm_area_struct *vma);
144 __poll_t (*map_poll)(struct bpf_map *map, struct file *filp,
145 struct poll_table_struct *pts);
146 unsigned long (*map_get_unmapped_area)(struct file *filep, unsigned long addr,
147 unsigned long len, unsigned long pgoff,
148 unsigned long flags);
149
150 /* Functions called by bpf_local_storage maps */
151 int (*map_local_storage_charge)(struct bpf_local_storage_map *smap,
152 void *owner, u32 size);
153 void (*map_local_storage_uncharge)(struct bpf_local_storage_map *smap,
154 void *owner, u32 size);
155 struct bpf_local_storage __rcu ** (*map_owner_storage_ptr)(void *owner);
156
157 /* Misc helpers.*/
158 long (*map_redirect)(struct bpf_map *map, u64 key, u64 flags);
159
160 /* map_meta_equal must be implemented for maps that can be
161 * used as an inner map. It is a runtime check to ensure
162 * an inner map can be inserted to an outer map.
163 *
164 * Some properties of the inner map has been used during the
165 * verification time. When inserting an inner map at the runtime,
166 * map_meta_equal has to ensure the inserting map has the same
167 * properties that the verifier has used earlier.
168 */
169 bool (*map_meta_equal)(const struct bpf_map *meta0,
170 const struct bpf_map *meta1);
171
172
173 int (*map_set_for_each_callback_args)(struct bpf_verifier_env *env,
174 struct bpf_func_state *caller,
175 struct bpf_func_state *callee);
176 long (*map_for_each_callback)(struct bpf_map *map,
177 bpf_callback_t callback_fn,
178 void *callback_ctx, u64 flags);
179
180 u64 (*map_mem_usage)(const struct bpf_map *map);
181
182 /* BTF id of struct allocated by map_alloc */
183 int *map_btf_id;
184
185 /* bpf_iter info used to open a seq_file */
186 const struct bpf_iter_seq_info *iter_seq_info;
187};
188
189enum {
190 /* Support at most 11 fields in a BTF type */
191 BTF_FIELDS_MAX = 11,
192};
193
194enum btf_field_type {
195 BPF_SPIN_LOCK = (1 << 0),
196 BPF_TIMER = (1 << 1),
197 BPF_KPTR_UNREF = (1 << 2),
198 BPF_KPTR_REF = (1 << 3),
199 BPF_KPTR_PERCPU = (1 << 4),
200 BPF_KPTR = BPF_KPTR_UNREF | BPF_KPTR_REF | BPF_KPTR_PERCPU,
201 BPF_LIST_HEAD = (1 << 5),
202 BPF_LIST_NODE = (1 << 6),
203 BPF_RB_ROOT = (1 << 7),
204 BPF_RB_NODE = (1 << 8),
205 BPF_GRAPH_NODE = BPF_RB_NODE | BPF_LIST_NODE,
206 BPF_GRAPH_ROOT = BPF_RB_ROOT | BPF_LIST_HEAD,
207 BPF_REFCOUNT = (1 << 9),
208 BPF_WORKQUEUE = (1 << 10),
209 BPF_UPTR = (1 << 11),
210 BPF_RES_SPIN_LOCK = (1 << 12),
211 BPF_TASK_WORK = (1 << 13),
212};
213
214enum bpf_cgroup_storage_type {
215 BPF_CGROUP_STORAGE_SHARED,
216 BPF_CGROUP_STORAGE_PERCPU,
217 __BPF_CGROUP_STORAGE_MAX
218#define MAX_BPF_CGROUP_STORAGE_TYPE __BPF_CGROUP_STORAGE_MAX
219};
220
221#ifdef CONFIG_CGROUP_BPF
222# define for_each_cgroup_storage_type(stype) \
223 for (stype = 0; stype < MAX_BPF_CGROUP_STORAGE_TYPE; stype++)
224#else
225# define for_each_cgroup_storage_type(stype) for (; false; )
226#endif /* CONFIG_CGROUP_BPF */
227
228typedef void (*btf_dtor_kfunc_t)(void *);
229
230struct btf_field_kptr {
231 struct btf *btf;
232 struct module *module;
233 /* dtor used if btf_is_kernel(btf), otherwise the type is
234 * program-allocated, dtor is NULL, and __bpf_obj_drop_impl is used
235 */
236 btf_dtor_kfunc_t dtor;
237 u32 btf_id;
238};
239
240struct btf_field_graph_root {
241 struct btf *btf;
242 u32 value_btf_id;
243 u32 node_offset;
244 struct btf_record *value_rec;
245};
246
247struct btf_field {
248 u32 offset;
249 u32 size;
250 enum btf_field_type type;
251 union {
252 struct btf_field_kptr kptr;
253 struct btf_field_graph_root graph_root;
254 };
255};
256
257struct btf_record {
258 u32 cnt;
259 u32 field_mask;
260 int spin_lock_off;
261 int res_spin_lock_off;
262 int timer_off;
263 int wq_off;
264 int refcount_off;
265 int task_work_off;
266 struct btf_field fields[];
267};
268
269/* Non-opaque version of bpf_rb_node in uapi/linux/bpf.h */
270struct bpf_rb_node_kern {
271 struct rb_node rb_node;
272 void *owner;
273} __attribute__((aligned(8)));
274
275/* Non-opaque version of bpf_list_node in uapi/linux/bpf.h */
276struct bpf_list_node_kern {
277 struct list_head list_head;
278 void *owner;
279} __attribute__((aligned(8)));
280
281/* 'Ownership' of program-containing map is claimed by the first program
282 * that is going to use this map or by the first program which FD is
283 * stored in the map to make sure that all callers and callees have the
284 * same prog type, JITed flag and xdp_has_frags flag.
285 */
286struct bpf_map_owner {
287 enum bpf_prog_type type;
288 bool jited;
289 bool xdp_has_frags;
290 bool sleepable;
291 u64 storage_cookie[MAX_BPF_CGROUP_STORAGE_TYPE];
292 const struct btf_type *attach_func_proto;
293 enum bpf_attach_type expected_attach_type;
294};
295
296struct bpf_map {
297 u8 sha[SHA256_DIGEST_SIZE];
298 const struct bpf_map_ops *ops;
299 struct bpf_map *inner_map_meta;
300#ifdef CONFIG_SECURITY
301 void *security;
302#endif
303 enum bpf_map_type map_type;
304 u32 key_size;
305 u32 value_size;
306 u32 max_entries;
307 u64 map_extra; /* any per-map-type extra fields */
308 u32 map_flags;
309 u32 id;
310 struct btf_record *record;
311 int numa_node;
312 u32 btf_key_type_id;
313 u32 btf_value_type_id;
314 u32 btf_vmlinux_value_type_id;
315 struct btf *btf;
316#ifdef CONFIG_MEMCG
317 struct obj_cgroup *objcg;
318#endif
319 char name[BPF_OBJ_NAME_LEN];
320 struct mutex freeze_mutex;
321 atomic64_t refcnt;
322 atomic64_t usercnt;
323 /* rcu is used before freeing and work is only used during freeing */
324 union {
325 struct work_struct work;
326 struct rcu_head rcu;
327 };
328 atomic64_t writecnt;
329 spinlock_t owner_lock;
330 struct bpf_map_owner *owner;
331 bool bypass_spec_v1;
332 bool frozen; /* write-once; write-protected by freeze_mutex */
333 bool free_after_mult_rcu_gp;
334 bool free_after_rcu_gp;
335 atomic64_t sleepable_refcnt;
336 s64 __percpu *elem_count;
337 u64 cookie; /* write-once */
338 char *excl_prog_sha;
339};
340
341static inline const char *btf_field_type_name(enum btf_field_type type)
342{
343 switch (type) {
344 case BPF_SPIN_LOCK:
345 return "bpf_spin_lock";
346 case BPF_RES_SPIN_LOCK:
347 return "bpf_res_spin_lock";
348 case BPF_TIMER:
349 return "bpf_timer";
350 case BPF_WORKQUEUE:
351 return "bpf_wq";
352 case BPF_KPTR_UNREF:
353 case BPF_KPTR_REF:
354 return "kptr";
355 case BPF_KPTR_PERCPU:
356 return "percpu_kptr";
357 case BPF_UPTR:
358 return "uptr";
359 case BPF_LIST_HEAD:
360 return "bpf_list_head";
361 case BPF_LIST_NODE:
362 return "bpf_list_node";
363 case BPF_RB_ROOT:
364 return "bpf_rb_root";
365 case BPF_RB_NODE:
366 return "bpf_rb_node";
367 case BPF_REFCOUNT:
368 return "bpf_refcount";
369 case BPF_TASK_WORK:
370 return "bpf_task_work";
371 default:
372 WARN_ON_ONCE(1);
373 return "unknown";
374 }
375}
376
377#if IS_ENABLED(CONFIG_DEBUG_KERNEL)
378#define BPF_WARN_ONCE(cond, format...) WARN_ONCE(cond, format)
379#else
380#define BPF_WARN_ONCE(cond, format...) BUILD_BUG_ON_INVALID(cond)
381#endif
382
383static inline u32 btf_field_type_size(enum btf_field_type type)
384{
385 switch (type) {
386 case BPF_SPIN_LOCK:
387 return sizeof(struct bpf_spin_lock);
388 case BPF_RES_SPIN_LOCK:
389 return sizeof(struct bpf_res_spin_lock);
390 case BPF_TIMER:
391 return sizeof(struct bpf_timer);
392 case BPF_WORKQUEUE:
393 return sizeof(struct bpf_wq);
394 case BPF_KPTR_UNREF:
395 case BPF_KPTR_REF:
396 case BPF_KPTR_PERCPU:
397 case BPF_UPTR:
398 return sizeof(u64);
399 case BPF_LIST_HEAD:
400 return sizeof(struct bpf_list_head);
401 case BPF_LIST_NODE:
402 return sizeof(struct bpf_list_node);
403 case BPF_RB_ROOT:
404 return sizeof(struct bpf_rb_root);
405 case BPF_RB_NODE:
406 return sizeof(struct bpf_rb_node);
407 case BPF_REFCOUNT:
408 return sizeof(struct bpf_refcount);
409 case BPF_TASK_WORK:
410 return sizeof(struct bpf_task_work);
411 default:
412 WARN_ON_ONCE(1);
413 return 0;
414 }
415}
416
417static inline u32 btf_field_type_align(enum btf_field_type type)
418{
419 switch (type) {
420 case BPF_SPIN_LOCK:
421 return __alignof__(struct bpf_spin_lock);
422 case BPF_RES_SPIN_LOCK:
423 return __alignof__(struct bpf_res_spin_lock);
424 case BPF_TIMER:
425 return __alignof__(struct bpf_timer);
426 case BPF_WORKQUEUE:
427 return __alignof__(struct bpf_wq);
428 case BPF_KPTR_UNREF:
429 case BPF_KPTR_REF:
430 case BPF_KPTR_PERCPU:
431 case BPF_UPTR:
432 return __alignof__(u64);
433 case BPF_LIST_HEAD:
434 return __alignof__(struct bpf_list_head);
435 case BPF_LIST_NODE:
436 return __alignof__(struct bpf_list_node);
437 case BPF_RB_ROOT:
438 return __alignof__(struct bpf_rb_root);
439 case BPF_RB_NODE:
440 return __alignof__(struct bpf_rb_node);
441 case BPF_REFCOUNT:
442 return __alignof__(struct bpf_refcount);
443 case BPF_TASK_WORK:
444 return __alignof__(struct bpf_task_work);
445 default:
446 WARN_ON_ONCE(1);
447 return 0;
448 }
449}
450
451static inline void bpf_obj_init_field(const struct btf_field *field, void *addr)
452{
453 memset(addr, 0, field->size);
454
455 switch (field->type) {
456 case BPF_REFCOUNT:
457 refcount_set((refcount_t *)addr, 1);
458 break;
459 case BPF_RB_NODE:
460 RB_CLEAR_NODE((struct rb_node *)addr);
461 break;
462 case BPF_LIST_HEAD:
463 case BPF_LIST_NODE:
464 INIT_LIST_HEAD((struct list_head *)addr);
465 break;
466 case BPF_RB_ROOT:
467 /* RB_ROOT_CACHED 0-inits, no need to do anything after memset */
468 case BPF_SPIN_LOCK:
469 case BPF_RES_SPIN_LOCK:
470 case BPF_TIMER:
471 case BPF_WORKQUEUE:
472 case BPF_KPTR_UNREF:
473 case BPF_KPTR_REF:
474 case BPF_KPTR_PERCPU:
475 case BPF_UPTR:
476 case BPF_TASK_WORK:
477 break;
478 default:
479 WARN_ON_ONCE(1);
480 return;
481 }
482}
483
484static inline bool btf_record_has_field(const struct btf_record *rec, enum btf_field_type type)
485{
486 if (IS_ERR_OR_NULL(rec))
487 return false;
488 return rec->field_mask & type;
489}
490
491static inline void bpf_obj_init(const struct btf_record *rec, void *obj)
492{
493 int i;
494
495 if (IS_ERR_OR_NULL(rec))
496 return;
497 for (i = 0; i < rec->cnt; i++)
498 bpf_obj_init_field(&rec->fields[i], obj + rec->fields[i].offset);
499}
500
501/* 'dst' must be a temporary buffer and should not point to memory that is being
502 * used in parallel by a bpf program or bpf syscall, otherwise the access from
503 * the bpf program or bpf syscall may be corrupted by the reinitialization,
504 * leading to weird problems. Even 'dst' is newly-allocated from bpf memory
505 * allocator, it is still possible for 'dst' to be used in parallel by a bpf
506 * program or bpf syscall.
507 */
508static inline void check_and_init_map_value(struct bpf_map *map, void *dst)
509{
510 bpf_obj_init(map->record, dst);
511}
512
513/* memcpy that is used with 8-byte aligned pointers, power-of-8 size and
514 * forced to use 'long' read/writes to try to atomically copy long counters.
515 * Best-effort only. No barriers here, since it _will_ race with concurrent
516 * updates from BPF programs. Called from bpf syscall and mostly used with
517 * size 8 or 16 bytes, so ask compiler to inline it.
518 */
519static inline void bpf_long_memcpy(void *dst, const void *src, u32 size)
520{
521 const long *lsrc = src;
522 long *ldst = dst;
523
524 size /= sizeof(long);
525 while (size--)
526 data_race(*ldst++ = *lsrc++);
527}
528
529/* copy everything but bpf_spin_lock, bpf_timer, and kptrs. There could be one of each. */
530static inline void bpf_obj_memcpy(struct btf_record *rec,
531 void *dst, void *src, u32 size,
532 bool long_memcpy)
533{
534 u32 curr_off = 0;
535 int i;
536
537 if (IS_ERR_OR_NULL(rec)) {
538 if (long_memcpy)
539 bpf_long_memcpy(dst, src, round_up(size, 8));
540 else
541 memcpy(dst, src, size);
542 return;
543 }
544
545 for (i = 0; i < rec->cnt; i++) {
546 u32 next_off = rec->fields[i].offset;
547 u32 sz = next_off - curr_off;
548
549 memcpy(dst + curr_off, src + curr_off, sz);
550 curr_off += rec->fields[i].size + sz;
551 }
552 memcpy(dst + curr_off, src + curr_off, size - curr_off);
553}
554
555static inline void copy_map_value(struct bpf_map *map, void *dst, void *src)
556{
557 bpf_obj_memcpy(map->record, dst, src, map->value_size, false);
558}
559
560static inline void copy_map_value_long(struct bpf_map *map, void *dst, void *src)
561{
562 bpf_obj_memcpy(map->record, dst, src, map->value_size, true);
563}
564
565static inline void bpf_obj_swap_uptrs(const struct btf_record *rec, void *dst, void *src)
566{
567 unsigned long *src_uptr, *dst_uptr;
568 const struct btf_field *field;
569 int i;
570
571 if (!btf_record_has_field(rec, BPF_UPTR))
572 return;
573
574 for (i = 0, field = rec->fields; i < rec->cnt; i++, field++) {
575 if (field->type != BPF_UPTR)
576 continue;
577
578 src_uptr = src + field->offset;
579 dst_uptr = dst + field->offset;
580 swap(*src_uptr, *dst_uptr);
581 }
582}
583
584static inline void bpf_obj_memzero(struct btf_record *rec, void *dst, u32 size)
585{
586 u32 curr_off = 0;
587 int i;
588
589 if (IS_ERR_OR_NULL(rec)) {
590 memset(dst, 0, size);
591 return;
592 }
593
594 for (i = 0; i < rec->cnt; i++) {
595 u32 next_off = rec->fields[i].offset;
596 u32 sz = next_off - curr_off;
597
598 memset(dst + curr_off, 0, sz);
599 curr_off += rec->fields[i].size + sz;
600 }
601 memset(dst + curr_off, 0, size - curr_off);
602}
603
604static inline void zero_map_value(struct bpf_map *map, void *dst)
605{
606 bpf_obj_memzero(map->record, dst, map->value_size);
607}
608
609void copy_map_value_locked(struct bpf_map *map, void *dst, void *src,
610 bool lock_src);
611void bpf_timer_cancel_and_free(void *timer);
612void bpf_wq_cancel_and_free(void *timer);
613void bpf_task_work_cancel_and_free(void *timer);
614void bpf_list_head_free(const struct btf_field *field, void *list_head,
615 struct bpf_spin_lock *spin_lock);
616void bpf_rb_root_free(const struct btf_field *field, void *rb_root,
617 struct bpf_spin_lock *spin_lock);
618u64 bpf_arena_get_kern_vm_start(struct bpf_arena *arena);
619u64 bpf_arena_get_user_vm_start(struct bpf_arena *arena);
620int bpf_obj_name_cpy(char *dst, const char *src, unsigned int size);
621
622struct bpf_offload_dev;
623struct bpf_offloaded_map;
624
625struct bpf_map_dev_ops {
626 int (*map_get_next_key)(struct bpf_offloaded_map *map,
627 void *key, void *next_key);
628 int (*map_lookup_elem)(struct bpf_offloaded_map *map,
629 void *key, void *value);
630 int (*map_update_elem)(struct bpf_offloaded_map *map,
631 void *key, void *value, u64 flags);
632 int (*map_delete_elem)(struct bpf_offloaded_map *map, void *key);
633};
634
635struct bpf_offloaded_map {
636 struct bpf_map map;
637 struct net_device *netdev;
638 const struct bpf_map_dev_ops *dev_ops;
639 void *dev_priv;
640 struct list_head offloads;
641};
642
643static inline struct bpf_offloaded_map *map_to_offmap(struct bpf_map *map)
644{
645 return container_of(map, struct bpf_offloaded_map, map);
646}
647
648static inline bool bpf_map_offload_neutral(const struct bpf_map *map)
649{
650 return map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY;
651}
652
653static inline bool bpf_map_support_seq_show(const struct bpf_map *map)
654{
655 return (map->btf_value_type_id || map->btf_vmlinux_value_type_id) &&
656 map->ops->map_seq_show_elem;
657}
658
659int map_check_no_btf(struct bpf_map *map,
660 const struct btf *btf,
661 const struct btf_type *key_type,
662 const struct btf_type *value_type);
663
664bool bpf_map_meta_equal(const struct bpf_map *meta0,
665 const struct bpf_map *meta1);
666
667static inline bool bpf_map_has_internal_structs(struct bpf_map *map)
668{
669 return btf_record_has_field(map->record, BPF_TIMER | BPF_WORKQUEUE | BPF_TASK_WORK);
670}
671
672void bpf_map_free_internal_structs(struct bpf_map *map, void *obj);
673
674int bpf_dynptr_from_file_sleepable(struct file *file, u32 flags,
675 struct bpf_dynptr *ptr__uninit);
676
677#if defined(CONFIG_MMU) && defined(CONFIG_64BIT)
678void *bpf_arena_alloc_pages_non_sleepable(void *p__map, void *addr__ign, u32 page_cnt, int node_id,
679 u64 flags);
680void bpf_arena_free_pages_non_sleepable(void *p__map, void *ptr__ign, u32 page_cnt);
681#else
682static inline void *bpf_arena_alloc_pages_non_sleepable(void *p__map, void *addr__ign, u32 page_cnt,
683 int node_id, u64 flags)
684{
685 return NULL;
686}
687
688static inline void bpf_arena_free_pages_non_sleepable(void *p__map, void *ptr__ign, u32 page_cnt)
689{
690}
691#endif
692
693extern const struct bpf_map_ops bpf_map_offload_ops;
694
695/* bpf_type_flag contains a set of flags that are applicable to the values of
696 * arg_type, ret_type and reg_type. For example, a pointer value may be null,
697 * or a memory is read-only. We classify types into two categories: base types
698 * and extended types. Extended types are base types combined with a type flag.
699 *
700 * Currently there are no more than 32 base types in arg_type, ret_type and
701 * reg_types.
702 */
703#define BPF_BASE_TYPE_BITS 8
704
705enum bpf_type_flag {
706 /* PTR may be NULL. */
707 PTR_MAYBE_NULL = BIT(0 + BPF_BASE_TYPE_BITS),
708
709 /* MEM is read-only. When applied on bpf_arg, it indicates the arg is
710 * compatible with both mutable and immutable memory.
711 */
712 MEM_RDONLY = BIT(1 + BPF_BASE_TYPE_BITS),
713
714 /* MEM points to BPF ring buffer reservation. */
715 MEM_RINGBUF = BIT(2 + BPF_BASE_TYPE_BITS),
716
717 /* MEM is in user address space. */
718 MEM_USER = BIT(3 + BPF_BASE_TYPE_BITS),
719
720 /* MEM is a percpu memory. MEM_PERCPU tags PTR_TO_BTF_ID. When tagged
721 * with MEM_PERCPU, PTR_TO_BTF_ID _cannot_ be directly accessed. In
722 * order to drop this tag, it must be passed into bpf_per_cpu_ptr()
723 * or bpf_this_cpu_ptr(), which will return the pointer corresponding
724 * to the specified cpu.
725 */
726 MEM_PERCPU = BIT(4 + BPF_BASE_TYPE_BITS),
727
728 /* Indicates that the argument will be released. */
729 OBJ_RELEASE = BIT(5 + BPF_BASE_TYPE_BITS),
730
731 /* PTR is not trusted. This is only used with PTR_TO_BTF_ID, to mark
732 * unreferenced and referenced kptr loaded from map value using a load
733 * instruction, so that they can only be dereferenced but not escape the
734 * BPF program into the kernel (i.e. cannot be passed as arguments to
735 * kfunc or bpf helpers).
736 */
737 PTR_UNTRUSTED = BIT(6 + BPF_BASE_TYPE_BITS),
738
739 /* MEM can be uninitialized. */
740 MEM_UNINIT = BIT(7 + BPF_BASE_TYPE_BITS),
741
742 /* DYNPTR points to memory local to the bpf program. */
743 DYNPTR_TYPE_LOCAL = BIT(8 + BPF_BASE_TYPE_BITS),
744
745 /* DYNPTR points to a kernel-produced ringbuf record. */
746 DYNPTR_TYPE_RINGBUF = BIT(9 + BPF_BASE_TYPE_BITS),
747
748 /* Size is known at compile time. */
749 MEM_FIXED_SIZE = BIT(10 + BPF_BASE_TYPE_BITS),
750
751 /* MEM is of an allocated object of type in program BTF. This is used to
752 * tag PTR_TO_BTF_ID allocated using bpf_obj_new.
753 */
754 MEM_ALLOC = BIT(11 + BPF_BASE_TYPE_BITS),
755
756 /* PTR was passed from the kernel in a trusted context, and may be
757 * passed to kfuncs or BPF helper functions.
758 * Confusingly, this is _not_ the opposite of PTR_UNTRUSTED above.
759 * PTR_UNTRUSTED refers to a kptr that was read directly from a map
760 * without invoking bpf_kptr_xchg(). What we really need to know is
761 * whether a pointer is safe to pass to a kfunc or BPF helper function.
762 * While PTR_UNTRUSTED pointers are unsafe to pass to kfuncs and BPF
763 * helpers, they do not cover all possible instances of unsafe
764 * pointers. For example, a pointer that was obtained from walking a
765 * struct will _not_ get the PTR_UNTRUSTED type modifier, despite the
766 * fact that it may be NULL, invalid, etc. This is due to backwards
767 * compatibility requirements, as this was the behavior that was first
768 * introduced when kptrs were added. The behavior is now considered
769 * deprecated, and PTR_UNTRUSTED will eventually be removed.
770 *
771 * PTR_TRUSTED, on the other hand, is a pointer that the kernel
772 * guarantees to be valid and safe to pass to kfuncs and BPF helpers.
773 * For example, pointers passed to tracepoint arguments are considered
774 * PTR_TRUSTED, as are pointers that are passed to struct_ops
775 * callbacks. As alluded to above, pointers that are obtained from
776 * walking PTR_TRUSTED pointers are _not_ trusted. For example, if a
777 * struct task_struct *task is PTR_TRUSTED, then accessing
778 * task->last_wakee will lose the PTR_TRUSTED modifier when it's stored
779 * in a BPF register. Similarly, pointers passed to certain programs
780 * types such as kretprobes are not guaranteed to be valid, as they may
781 * for example contain an object that was recently freed.
782 */
783 PTR_TRUSTED = BIT(12 + BPF_BASE_TYPE_BITS),
784
785 /* MEM is tagged with rcu and memory access needs rcu_read_lock protection. */
786 MEM_RCU = BIT(13 + BPF_BASE_TYPE_BITS),
787
788 /* Used to tag PTR_TO_BTF_ID | MEM_ALLOC references which are non-owning.
789 * Currently only valid for linked-list and rbtree nodes. If the nodes
790 * have a bpf_refcount_field, they must be tagged MEM_RCU as well.
791 */
792 NON_OWN_REF = BIT(14 + BPF_BASE_TYPE_BITS),
793
794 /* DYNPTR points to sk_buff */
795 DYNPTR_TYPE_SKB = BIT(15 + BPF_BASE_TYPE_BITS),
796
797 /* DYNPTR points to xdp_buff */
798 DYNPTR_TYPE_XDP = BIT(16 + BPF_BASE_TYPE_BITS),
799
800 /* Memory must be aligned on some architectures, used in combination with
801 * MEM_FIXED_SIZE.
802 */
803 MEM_ALIGNED = BIT(17 + BPF_BASE_TYPE_BITS),
804
805 /* MEM is being written to, often combined with MEM_UNINIT. Non-presence
806 * of MEM_WRITE means that MEM is only being read. MEM_WRITE without the
807 * MEM_UNINIT means that memory needs to be initialized since it is also
808 * read.
809 */
810 MEM_WRITE = BIT(18 + BPF_BASE_TYPE_BITS),
811
812 /* DYNPTR points to skb_metadata_end()-skb_metadata_len() */
813 DYNPTR_TYPE_SKB_META = BIT(19 + BPF_BASE_TYPE_BITS),
814
815 /* DYNPTR points to file */
816 DYNPTR_TYPE_FILE = BIT(20 + BPF_BASE_TYPE_BITS),
817
818 __BPF_TYPE_FLAG_MAX,
819 __BPF_TYPE_LAST_FLAG = __BPF_TYPE_FLAG_MAX - 1,
820};
821
822#define DYNPTR_TYPE_FLAG_MASK (DYNPTR_TYPE_LOCAL | DYNPTR_TYPE_RINGBUF | DYNPTR_TYPE_SKB \
823 | DYNPTR_TYPE_XDP | DYNPTR_TYPE_SKB_META | DYNPTR_TYPE_FILE)
824
825/* Max number of base types. */
826#define BPF_BASE_TYPE_LIMIT (1UL << BPF_BASE_TYPE_BITS)
827
828/* Max number of all types. */
829#define BPF_TYPE_LIMIT (__BPF_TYPE_LAST_FLAG | (__BPF_TYPE_LAST_FLAG - 1))
830
831/* function argument constraints */
832enum bpf_arg_type {
833 ARG_DONTCARE = 0, /* unused argument in helper function */
834
835 /* the following constraints used to prototype
836 * bpf_map_lookup/update/delete_elem() functions
837 */
838 ARG_CONST_MAP_PTR, /* const argument used as pointer to bpf_map */
839 ARG_PTR_TO_MAP_KEY, /* pointer to stack used as map key */
840 ARG_PTR_TO_MAP_VALUE, /* pointer to stack used as map value */
841
842 /* Used to prototype bpf_memcmp() and other functions that access data
843 * on eBPF program stack
844 */
845 ARG_PTR_TO_MEM, /* pointer to valid memory (stack, packet, map value) */
846 ARG_PTR_TO_ARENA,
847
848 ARG_CONST_SIZE, /* number of bytes accessed from memory */
849 ARG_CONST_SIZE_OR_ZERO, /* number of bytes accessed from memory or 0 */
850
851 ARG_PTR_TO_CTX, /* pointer to context */
852 ARG_ANYTHING, /* any (initialized) argument is ok */
853 ARG_PTR_TO_SPIN_LOCK, /* pointer to bpf_spin_lock */
854 ARG_PTR_TO_SOCK_COMMON, /* pointer to sock_common */
855 ARG_PTR_TO_SOCKET, /* pointer to bpf_sock (fullsock) */
856 ARG_PTR_TO_BTF_ID, /* pointer to in-kernel struct */
857 ARG_PTR_TO_RINGBUF_MEM, /* pointer to dynamically reserved ringbuf memory */
858 ARG_CONST_ALLOC_SIZE_OR_ZERO, /* number of allocated bytes requested */
859 ARG_PTR_TO_BTF_ID_SOCK_COMMON, /* pointer to in-kernel sock_common or bpf-mirrored bpf_sock */
860 ARG_PTR_TO_PERCPU_BTF_ID, /* pointer to in-kernel percpu type */
861 ARG_PTR_TO_FUNC, /* pointer to a bpf program function */
862 ARG_PTR_TO_STACK, /* pointer to stack */
863 ARG_PTR_TO_CONST_STR, /* pointer to a null terminated read-only string */
864 ARG_PTR_TO_TIMER, /* pointer to bpf_timer */
865 ARG_KPTR_XCHG_DEST, /* pointer to destination that kptrs are bpf_kptr_xchg'd into */
866 ARG_PTR_TO_DYNPTR, /* pointer to bpf_dynptr. See bpf_type_flag for dynptr type */
867 __BPF_ARG_TYPE_MAX,
868
869 /* Extended arg_types. */
870 ARG_PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_MAP_VALUE,
871 ARG_PTR_TO_MEM_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_MEM,
872 ARG_PTR_TO_CTX_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_CTX,
873 ARG_PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_SOCKET,
874 ARG_PTR_TO_STACK_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_STACK,
875 ARG_PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_BTF_ID,
876 /* Pointer to memory does not need to be initialized, since helper function
877 * fills all bytes or clears them in error case.
878 */
879 ARG_PTR_TO_UNINIT_MEM = MEM_UNINIT | MEM_WRITE | ARG_PTR_TO_MEM,
880 /* Pointer to valid memory of size known at compile time. */
881 ARG_PTR_TO_FIXED_SIZE_MEM = MEM_FIXED_SIZE | ARG_PTR_TO_MEM,
882
883 /* This must be the last entry. Its purpose is to ensure the enum is
884 * wide enough to hold the higher bits reserved for bpf_type_flag.
885 */
886 __BPF_ARG_TYPE_LIMIT = BPF_TYPE_LIMIT,
887};
888static_assert(__BPF_ARG_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
889
890/* type of values returned from helper functions */
891enum bpf_return_type {
892 RET_INTEGER, /* function returns integer */
893 RET_VOID, /* function doesn't return anything */
894 RET_PTR_TO_MAP_VALUE, /* returns a pointer to map elem value */
895 RET_PTR_TO_SOCKET, /* returns a pointer to a socket */
896 RET_PTR_TO_TCP_SOCK, /* returns a pointer to a tcp_sock */
897 RET_PTR_TO_SOCK_COMMON, /* returns a pointer to a sock_common */
898 RET_PTR_TO_MEM, /* returns a pointer to memory */
899 RET_PTR_TO_MEM_OR_BTF_ID, /* returns a pointer to a valid memory or a btf_id */
900 RET_PTR_TO_BTF_ID, /* returns a pointer to a btf_id */
901 __BPF_RET_TYPE_MAX,
902
903 /* Extended ret_types. */
904 RET_PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_MAP_VALUE,
905 RET_PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_SOCKET,
906 RET_PTR_TO_TCP_SOCK_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_TCP_SOCK,
907 RET_PTR_TO_SOCK_COMMON_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_SOCK_COMMON,
908 RET_PTR_TO_RINGBUF_MEM_OR_NULL = PTR_MAYBE_NULL | MEM_RINGBUF | RET_PTR_TO_MEM,
909 RET_PTR_TO_DYNPTR_MEM_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_MEM,
910 RET_PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_BTF_ID,
911 RET_PTR_TO_BTF_ID_TRUSTED = PTR_TRUSTED | RET_PTR_TO_BTF_ID,
912
913 /* This must be the last entry. Its purpose is to ensure the enum is
914 * wide enough to hold the higher bits reserved for bpf_type_flag.
915 */
916 __BPF_RET_TYPE_LIMIT = BPF_TYPE_LIMIT,
917};
918static_assert(__BPF_RET_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
919
920/* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs
921 * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL
922 * instructions after verifying
923 */
924struct bpf_func_proto {
925 u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
926 bool gpl_only;
927 bool pkt_access;
928 bool might_sleep;
929 /* set to true if helper follows contract for llvm
930 * attribute bpf_fastcall:
931 * - void functions do not scratch r0
932 * - functions taking N arguments scratch only registers r1-rN
933 */
934 bool allow_fastcall;
935 enum bpf_return_type ret_type;
936 union {
937 struct {
938 enum bpf_arg_type arg1_type;
939 enum bpf_arg_type arg2_type;
940 enum bpf_arg_type arg3_type;
941 enum bpf_arg_type arg4_type;
942 enum bpf_arg_type arg5_type;
943 };
944 enum bpf_arg_type arg_type[5];
945 };
946 union {
947 struct {
948 u32 *arg1_btf_id;
949 u32 *arg2_btf_id;
950 u32 *arg3_btf_id;
951 u32 *arg4_btf_id;
952 u32 *arg5_btf_id;
953 };
954 u32 *arg_btf_id[5];
955 struct {
956 size_t arg1_size;
957 size_t arg2_size;
958 size_t arg3_size;
959 size_t arg4_size;
960 size_t arg5_size;
961 };
962 size_t arg_size[5];
963 };
964 int *ret_btf_id; /* return value btf_id */
965 bool (*allowed)(const struct bpf_prog *prog);
966};
967
968/* bpf_context is intentionally undefined structure. Pointer to bpf_context is
969 * the first argument to eBPF programs.
970 * For socket filters: 'struct bpf_context *' == 'struct sk_buff *'
971 */
972struct bpf_context;
973
974enum bpf_access_type {
975 BPF_READ = 1,
976 BPF_WRITE = 2
977};
978
979/* types of values stored in eBPF registers */
980/* Pointer types represent:
981 * pointer
982 * pointer + imm
983 * pointer + (u16) var
984 * pointer + (u16) var + imm
985 * if (range > 0) then [ptr, ptr + range - off) is safe to access
986 * if (id > 0) means that some 'var' was added
987 * if (off > 0) means that 'imm' was added
988 */
989enum bpf_reg_type {
990 NOT_INIT = 0, /* nothing was written into register */
991 SCALAR_VALUE, /* reg doesn't contain a valid pointer */
992 PTR_TO_CTX, /* reg points to bpf_context */
993 CONST_PTR_TO_MAP, /* reg points to struct bpf_map */
994 PTR_TO_MAP_VALUE, /* reg points to map element value */
995 PTR_TO_MAP_KEY, /* reg points to a map element key */
996 PTR_TO_STACK, /* reg == frame_pointer + offset */
997 PTR_TO_PACKET_META, /* skb->data - meta_len */
998 PTR_TO_PACKET, /* reg points to skb->data */
999 PTR_TO_PACKET_END, /* skb->data + headlen */
1000 PTR_TO_FLOW_KEYS, /* reg points to bpf_flow_keys */
1001 PTR_TO_SOCKET, /* reg points to struct bpf_sock */
1002 PTR_TO_SOCK_COMMON, /* reg points to sock_common */
1003 PTR_TO_TCP_SOCK, /* reg points to struct tcp_sock */
1004 PTR_TO_TP_BUFFER, /* reg points to a writable raw tp's buffer */
1005 PTR_TO_XDP_SOCK, /* reg points to struct xdp_sock */
1006 /* PTR_TO_BTF_ID points to a kernel struct that does not need
1007 * to be null checked by the BPF program. This does not imply the
1008 * pointer is _not_ null and in practice this can easily be a null
1009 * pointer when reading pointer chains. The assumption is program
1010 * context will handle null pointer dereference typically via fault
1011 * handling. The verifier must keep this in mind and can make no
1012 * assumptions about null or non-null when doing branch analysis.
1013 * Further, when passed into helpers the helpers can not, without
1014 * additional context, assume the value is non-null.
1015 */
1016 PTR_TO_BTF_ID,
1017 PTR_TO_MEM, /* reg points to valid memory region */
1018 PTR_TO_ARENA,
1019 PTR_TO_BUF, /* reg points to a read/write buffer */
1020 PTR_TO_FUNC, /* reg points to a bpf program function */
1021 PTR_TO_INSN, /* reg points to a bpf program instruction */
1022 CONST_PTR_TO_DYNPTR, /* reg points to a const struct bpf_dynptr */
1023 __BPF_REG_TYPE_MAX,
1024
1025 /* Extended reg_types. */
1026 PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | PTR_TO_MAP_VALUE,
1027 PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | PTR_TO_SOCKET,
1028 PTR_TO_SOCK_COMMON_OR_NULL = PTR_MAYBE_NULL | PTR_TO_SOCK_COMMON,
1029 PTR_TO_TCP_SOCK_OR_NULL = PTR_MAYBE_NULL | PTR_TO_TCP_SOCK,
1030 /* PTR_TO_BTF_ID_OR_NULL points to a kernel struct that has not
1031 * been checked for null. Used primarily to inform the verifier
1032 * an explicit null check is required for this struct.
1033 */
1034 PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | PTR_TO_BTF_ID,
1035
1036 /* This must be the last entry. Its purpose is to ensure the enum is
1037 * wide enough to hold the higher bits reserved for bpf_type_flag.
1038 */
1039 __BPF_REG_TYPE_LIMIT = BPF_TYPE_LIMIT,
1040};
1041static_assert(__BPF_REG_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
1042
1043/* The information passed from prog-specific *_is_valid_access
1044 * back to the verifier.
1045 */
1046struct bpf_insn_access_aux {
1047 enum bpf_reg_type reg_type;
1048 bool is_ldsx;
1049 union {
1050 int ctx_field_size;
1051 struct {
1052 struct btf *btf;
1053 u32 btf_id;
1054 u32 ref_obj_id;
1055 };
1056 };
1057 struct bpf_verifier_log *log; /* for verbose logs */
1058 bool is_retval; /* is accessing function return value ? */
1059};
1060
1061static inline void
1062bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size)
1063{
1064 aux->ctx_field_size = size;
1065}
1066
1067static bool bpf_is_ldimm64(const struct bpf_insn *insn)
1068{
1069 return insn->code == (BPF_LD | BPF_IMM | BPF_DW);
1070}
1071
1072static inline bool bpf_pseudo_func(const struct bpf_insn *insn)
1073{
1074 return bpf_is_ldimm64(insn) && insn->src_reg == BPF_PSEUDO_FUNC;
1075}
1076
1077/* Given a BPF_ATOMIC instruction @atomic_insn, return true if it is an
1078 * atomic load or store, and false if it is a read-modify-write instruction.
1079 */
1080static inline bool
1081bpf_atomic_is_load_store(const struct bpf_insn *atomic_insn)
1082{
1083 switch (atomic_insn->imm) {
1084 case BPF_LOAD_ACQ:
1085 case BPF_STORE_REL:
1086 return true;
1087 default:
1088 return false;
1089 }
1090}
1091
1092struct bpf_prog_ops {
1093 int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr,
1094 union bpf_attr __user *uattr);
1095};
1096
1097struct bpf_reg_state;
1098struct bpf_verifier_ops {
1099 /* return eBPF function prototype for verification */
1100 const struct bpf_func_proto *
1101 (*get_func_proto)(enum bpf_func_id func_id,
1102 const struct bpf_prog *prog);
1103
1104 /* return true if 'size' wide access at offset 'off' within bpf_context
1105 * with 'type' (read or write) is allowed
1106 */
1107 bool (*is_valid_access)(int off, int size, enum bpf_access_type type,
1108 const struct bpf_prog *prog,
1109 struct bpf_insn_access_aux *info);
1110 int (*gen_prologue)(struct bpf_insn *insn, bool direct_write,
1111 const struct bpf_prog *prog);
1112 int (*gen_epilogue)(struct bpf_insn *insn, const struct bpf_prog *prog,
1113 s16 ctx_stack_off);
1114 int (*gen_ld_abs)(const struct bpf_insn *orig,
1115 struct bpf_insn *insn_buf);
1116 u32 (*convert_ctx_access)(enum bpf_access_type type,
1117 const struct bpf_insn *src,
1118 struct bpf_insn *dst,
1119 struct bpf_prog *prog, u32 *target_size);
1120 int (*btf_struct_access)(struct bpf_verifier_log *log,
1121 const struct bpf_reg_state *reg,
1122 int off, int size);
1123};
1124
1125struct bpf_prog_offload_ops {
1126 /* verifier basic callbacks */
1127 int (*insn_hook)(struct bpf_verifier_env *env,
1128 int insn_idx, int prev_insn_idx);
1129 int (*finalize)(struct bpf_verifier_env *env);
1130 /* verifier optimization callbacks (called after .finalize) */
1131 int (*replace_insn)(struct bpf_verifier_env *env, u32 off,
1132 struct bpf_insn *insn);
1133 int (*remove_insns)(struct bpf_verifier_env *env, u32 off, u32 cnt);
1134 /* program management callbacks */
1135 int (*prepare)(struct bpf_prog *prog);
1136 int (*translate)(struct bpf_prog *prog);
1137 void (*destroy)(struct bpf_prog *prog);
1138};
1139
1140struct bpf_prog_offload {
1141 struct bpf_prog *prog;
1142 struct net_device *netdev;
1143 struct bpf_offload_dev *offdev;
1144 void *dev_priv;
1145 struct list_head offloads;
1146 bool dev_state;
1147 bool opt_failed;
1148 void *jited_image;
1149 u32 jited_len;
1150};
1151
1152/* The longest tracepoint has 12 args.
1153 * See include/trace/bpf_probe.h
1154 */
1155#define MAX_BPF_FUNC_ARGS 12
1156
1157/* The maximum number of arguments passed through registers
1158 * a single function may have.
1159 */
1160#define MAX_BPF_FUNC_REG_ARGS 5
1161
1162/* The argument is a structure or a union. */
1163#define BTF_FMODEL_STRUCT_ARG BIT(0)
1164
1165/* The argument is signed. */
1166#define BTF_FMODEL_SIGNED_ARG BIT(1)
1167
1168struct btf_func_model {
1169 u8 ret_size;
1170 u8 ret_flags;
1171 u8 nr_args;
1172 u8 arg_size[MAX_BPF_FUNC_ARGS];
1173 u8 arg_flags[MAX_BPF_FUNC_ARGS];
1174};
1175
1176/* Restore arguments before returning from trampoline to let original function
1177 * continue executing. This flag is used for fentry progs when there are no
1178 * fexit progs.
1179 */
1180#define BPF_TRAMP_F_RESTORE_REGS BIT(0)
1181/* Call original function after fentry progs, but before fexit progs.
1182 * Makes sense for fentry/fexit, normal calls and indirect calls.
1183 */
1184#define BPF_TRAMP_F_CALL_ORIG BIT(1)
1185/* Skip current frame and return to parent. Makes sense for fentry/fexit
1186 * programs only. Should not be used with normal calls and indirect calls.
1187 */
1188#define BPF_TRAMP_F_SKIP_FRAME BIT(2)
1189/* Store IP address of the caller on the trampoline stack,
1190 * so it's available for trampoline's programs.
1191 */
1192#define BPF_TRAMP_F_IP_ARG BIT(3)
1193/* Return the return value of fentry prog. Only used by bpf_struct_ops. */
1194#define BPF_TRAMP_F_RET_FENTRY_RET BIT(4)
1195
1196/* Get original function from stack instead of from provided direct address.
1197 * Makes sense for trampolines with fexit or fmod_ret programs.
1198 */
1199#define BPF_TRAMP_F_ORIG_STACK BIT(5)
1200
1201/* This trampoline is on a function with another ftrace_ops with IPMODIFY,
1202 * e.g., a live patch. This flag is set and cleared by ftrace call backs,
1203 */
1204#define BPF_TRAMP_F_SHARE_IPMODIFY BIT(6)
1205
1206/* Indicate that current trampoline is in a tail call context. Then, it has to
1207 * cache and restore tail_call_cnt to avoid infinite tail call loop.
1208 */
1209#define BPF_TRAMP_F_TAIL_CALL_CTX BIT(7)
1210
1211/*
1212 * Indicate the trampoline should be suitable to receive indirect calls;
1213 * without this indirectly calling the generated code can result in #UD/#CP,
1214 * depending on the CFI options.
1215 *
1216 * Used by bpf_struct_ops.
1217 *
1218 * Incompatible with FENTRY usage, overloads @func_addr argument.
1219 */
1220#define BPF_TRAMP_F_INDIRECT BIT(8)
1221
1222/* Each call __bpf_prog_enter + call bpf_func + call __bpf_prog_exit is ~50
1223 * bytes on x86.
1224 */
1225enum {
1226#if defined(__s390x__)
1227 BPF_MAX_TRAMP_LINKS = 27,
1228#else
1229 BPF_MAX_TRAMP_LINKS = 38,
1230#endif
1231};
1232
1233#define BPF_TRAMP_COOKIE_INDEX_SHIFT 8
1234#define BPF_TRAMP_IS_RETURN_SHIFT 63
1235
1236struct bpf_tramp_links {
1237 struct bpf_tramp_link *links[BPF_MAX_TRAMP_LINKS];
1238 int nr_links;
1239};
1240
1241struct bpf_tramp_run_ctx;
1242
1243/* Different use cases for BPF trampoline:
1244 * 1. replace nop at the function entry (kprobe equivalent)
1245 * flags = BPF_TRAMP_F_RESTORE_REGS
1246 * fentry = a set of programs to run before returning from trampoline
1247 *
1248 * 2. replace nop at the function entry (kprobe + kretprobe equivalent)
1249 * flags = BPF_TRAMP_F_CALL_ORIG | BPF_TRAMP_F_SKIP_FRAME
1250 * orig_call = fentry_ip + MCOUNT_INSN_SIZE
1251 * fentry = a set of program to run before calling original function
1252 * fexit = a set of program to run after original function
1253 *
1254 * 3. replace direct call instruction anywhere in the function body
1255 * or assign a function pointer for indirect call (like tcp_congestion_ops->cong_avoid)
1256 * With flags = 0
1257 * fentry = a set of programs to run before returning from trampoline
1258 * With flags = BPF_TRAMP_F_CALL_ORIG
1259 * orig_call = original callback addr or direct function addr
1260 * fentry = a set of program to run before calling original function
1261 * fexit = a set of program to run after original function
1262 */
1263struct bpf_tramp_image;
1264int arch_prepare_bpf_trampoline(struct bpf_tramp_image *im, void *image, void *image_end,
1265 const struct btf_func_model *m, u32 flags,
1266 struct bpf_tramp_links *tlinks,
1267 void *func_addr);
1268void *arch_alloc_bpf_trampoline(unsigned int size);
1269void arch_free_bpf_trampoline(void *image, unsigned int size);
1270int __must_check arch_protect_bpf_trampoline(void *image, unsigned int size);
1271int arch_bpf_trampoline_size(const struct btf_func_model *m, u32 flags,
1272 struct bpf_tramp_links *tlinks, void *func_addr);
1273
1274u64 notrace __bpf_prog_enter_sleepable_recur(struct bpf_prog *prog,
1275 struct bpf_tramp_run_ctx *run_ctx);
1276void notrace __bpf_prog_exit_sleepable_recur(struct bpf_prog *prog, u64 start,
1277 struct bpf_tramp_run_ctx *run_ctx);
1278void notrace __bpf_tramp_enter(struct bpf_tramp_image *tr);
1279void notrace __bpf_tramp_exit(struct bpf_tramp_image *tr);
1280typedef u64 (*bpf_trampoline_enter_t)(struct bpf_prog *prog,
1281 struct bpf_tramp_run_ctx *run_ctx);
1282typedef void (*bpf_trampoline_exit_t)(struct bpf_prog *prog, u64 start,
1283 struct bpf_tramp_run_ctx *run_ctx);
1284bpf_trampoline_enter_t bpf_trampoline_enter(const struct bpf_prog *prog);
1285bpf_trampoline_exit_t bpf_trampoline_exit(const struct bpf_prog *prog);
1286
1287#ifdef CONFIG_DYNAMIC_FTRACE_WITH_JMP
1288static inline bool bpf_trampoline_use_jmp(u64 flags)
1289{
1290 return flags & BPF_TRAMP_F_CALL_ORIG && !(flags & BPF_TRAMP_F_SKIP_FRAME);
1291}
1292#else
1293static inline bool bpf_trampoline_use_jmp(u64 flags)
1294{
1295 return false;
1296}
1297#endif
1298
1299struct bpf_ksym {
1300 unsigned long start;
1301 unsigned long end;
1302 char name[KSYM_NAME_LEN];
1303 struct list_head lnode;
1304 struct latch_tree_node tnode;
1305 bool prog;
1306 u32 fp_start;
1307 u32 fp_end;
1308};
1309
1310enum bpf_tramp_prog_type {
1311 BPF_TRAMP_FENTRY,
1312 BPF_TRAMP_FEXIT,
1313 BPF_TRAMP_MODIFY_RETURN,
1314 BPF_TRAMP_MAX,
1315 BPF_TRAMP_REPLACE, /* more than MAX */
1316 BPF_TRAMP_FSESSION,
1317};
1318
1319struct bpf_tramp_image {
1320 void *image;
1321 int size;
1322 struct bpf_ksym ksym;
1323 struct percpu_ref pcref;
1324 void *ip_after_call;
1325 void *ip_epilogue;
1326 union {
1327 struct rcu_head rcu;
1328 struct work_struct work;
1329 };
1330};
1331
1332struct bpf_trampoline {
1333 /* hlist for trampoline_key_table */
1334 struct hlist_node hlist_key;
1335 /* hlist for trampoline_ip_table */
1336 struct hlist_node hlist_ip;
1337 struct ftrace_ops *fops;
1338 /* serializes access to fields of this trampoline */
1339 struct mutex mutex;
1340 refcount_t refcnt;
1341 u32 flags;
1342 u64 key;
1343 unsigned long ip;
1344 struct {
1345 struct btf_func_model model;
1346 void *addr;
1347 bool ftrace_managed;
1348 } func;
1349 /* if !NULL this is BPF_PROG_TYPE_EXT program that extends another BPF
1350 * program by replacing one of its functions. func.addr is the address
1351 * of the function it replaced.
1352 */
1353 struct bpf_prog *extension_prog;
1354 /* list of BPF programs using this trampoline */
1355 struct hlist_head progs_hlist[BPF_TRAMP_MAX];
1356 /* Number of attached programs. A counter per kind. */
1357 int progs_cnt[BPF_TRAMP_MAX];
1358 /* Executable image of trampoline */
1359 struct bpf_tramp_image *cur_image;
1360};
1361
1362struct bpf_attach_target_info {
1363 struct btf_func_model fmodel;
1364 long tgt_addr;
1365 struct module *tgt_mod;
1366 const char *tgt_name;
1367 const struct btf_type *tgt_type;
1368};
1369
1370#define BPF_DISPATCHER_MAX 48 /* Fits in 2048B */
1371
1372struct bpf_dispatcher_prog {
1373 struct bpf_prog *prog;
1374 refcount_t users;
1375};
1376
1377struct bpf_dispatcher {
1378 /* dispatcher mutex */
1379 struct mutex mutex;
1380 void *func;
1381 struct bpf_dispatcher_prog progs[BPF_DISPATCHER_MAX];
1382 int num_progs;
1383 void *image;
1384 void *rw_image;
1385 u32 image_off;
1386 struct bpf_ksym ksym;
1387#ifdef CONFIG_HAVE_STATIC_CALL
1388 struct static_call_key *sc_key;
1389 void *sc_tramp;
1390#endif
1391};
1392
1393#ifndef __bpfcall
1394#define __bpfcall __nocfi
1395#endif
1396
1397static __always_inline __bpfcall unsigned int bpf_dispatcher_nop_func(
1398 const void *ctx,
1399 const struct bpf_insn *insnsi,
1400 bpf_func_t bpf_func)
1401{
1402 return bpf_func(ctx, insnsi);
1403}
1404
1405/* the implementation of the opaque uapi struct bpf_dynptr */
1406struct bpf_dynptr_kern {
1407 void *data;
1408 /* Size represents the number of usable bytes of dynptr data.
1409 * If for example the offset is at 4 for a local dynptr whose data is
1410 * of type u64, the number of usable bytes is 4.
1411 *
1412 * The upper 8 bits are reserved. It is as follows:
1413 * Bits 0 - 23 = size
1414 * Bits 24 - 30 = dynptr type
1415 * Bit 31 = whether dynptr is read-only
1416 */
1417 u32 size;
1418 u32 offset;
1419} __aligned(8);
1420
1421enum bpf_dynptr_type {
1422 BPF_DYNPTR_TYPE_INVALID,
1423 /* Points to memory that is local to the bpf program */
1424 BPF_DYNPTR_TYPE_LOCAL,
1425 /* Underlying data is a ringbuf record */
1426 BPF_DYNPTR_TYPE_RINGBUF,
1427 /* Underlying data is a sk_buff */
1428 BPF_DYNPTR_TYPE_SKB,
1429 /* Underlying data is a xdp_buff */
1430 BPF_DYNPTR_TYPE_XDP,
1431 /* Points to skb_metadata_end()-skb_metadata_len() */
1432 BPF_DYNPTR_TYPE_SKB_META,
1433 /* Underlying data is a file */
1434 BPF_DYNPTR_TYPE_FILE,
1435};
1436
1437int bpf_dynptr_check_size(u64 size);
1438u64 __bpf_dynptr_size(const struct bpf_dynptr_kern *ptr);
1439const void *__bpf_dynptr_data(const struct bpf_dynptr_kern *ptr, u64 len);
1440void *__bpf_dynptr_data_rw(const struct bpf_dynptr_kern *ptr, u64 len);
1441bool __bpf_dynptr_is_rdonly(const struct bpf_dynptr_kern *ptr);
1442int __bpf_dynptr_write(const struct bpf_dynptr_kern *dst, u64 offset,
1443 void *src, u64 len, u64 flags);
1444void *bpf_dynptr_slice_rdwr(const struct bpf_dynptr *p, u64 offset,
1445 void *buffer__nullable, u64 buffer__szk);
1446
1447static inline int bpf_dynptr_check_off_len(const struct bpf_dynptr_kern *ptr, u64 offset, u64 len)
1448{
1449 u64 size = __bpf_dynptr_size(ptr);
1450
1451 if (len > size || offset > size - len)
1452 return -E2BIG;
1453
1454 return 0;
1455}
1456
1457#ifdef CONFIG_BPF_JIT
1458int bpf_trampoline_link_prog(struct bpf_tramp_link *link,
1459 struct bpf_trampoline *tr,
1460 struct bpf_prog *tgt_prog);
1461int bpf_trampoline_unlink_prog(struct bpf_tramp_link *link,
1462 struct bpf_trampoline *tr,
1463 struct bpf_prog *tgt_prog);
1464struct bpf_trampoline *bpf_trampoline_get(u64 key,
1465 struct bpf_attach_target_info *tgt_info);
1466void bpf_trampoline_put(struct bpf_trampoline *tr);
1467int arch_prepare_bpf_dispatcher(void *image, void *buf, s64 *funcs, int num_funcs);
1468
1469/*
1470 * When the architecture supports STATIC_CALL replace the bpf_dispatcher_fn
1471 * indirection with a direct call to the bpf program. If the architecture does
1472 * not have STATIC_CALL, avoid a double-indirection.
1473 */
1474#ifdef CONFIG_HAVE_STATIC_CALL
1475
1476#define __BPF_DISPATCHER_SC_INIT(_name) \
1477 .sc_key = &STATIC_CALL_KEY(_name), \
1478 .sc_tramp = STATIC_CALL_TRAMP_ADDR(_name),
1479
1480#define __BPF_DISPATCHER_SC(name) \
1481 DEFINE_STATIC_CALL(bpf_dispatcher_##name##_call, bpf_dispatcher_nop_func)
1482
1483#define __BPF_DISPATCHER_CALL(name) \
1484 static_call(bpf_dispatcher_##name##_call)(ctx, insnsi, bpf_func)
1485
1486#define __BPF_DISPATCHER_UPDATE(_d, _new) \
1487 __static_call_update((_d)->sc_key, (_d)->sc_tramp, (_new))
1488
1489#else
1490#define __BPF_DISPATCHER_SC_INIT(name)
1491#define __BPF_DISPATCHER_SC(name)
1492#define __BPF_DISPATCHER_CALL(name) bpf_func(ctx, insnsi)
1493#define __BPF_DISPATCHER_UPDATE(_d, _new)
1494#endif
1495
1496#define BPF_DISPATCHER_INIT(_name) { \
1497 .mutex = __MUTEX_INITIALIZER(_name.mutex), \
1498 .func = &_name##_func, \
1499 .progs = {}, \
1500 .num_progs = 0, \
1501 .image = NULL, \
1502 .image_off = 0, \
1503 .ksym = { \
1504 .name = #_name, \
1505 .lnode = LIST_HEAD_INIT(_name.ksym.lnode), \
1506 }, \
1507 __BPF_DISPATCHER_SC_INIT(_name##_call) \
1508}
1509
1510#define DEFINE_BPF_DISPATCHER(name) \
1511 __BPF_DISPATCHER_SC(name); \
1512 noinline __bpfcall unsigned int bpf_dispatcher_##name##_func( \
1513 const void *ctx, \
1514 const struct bpf_insn *insnsi, \
1515 bpf_func_t bpf_func) \
1516 { \
1517 return __BPF_DISPATCHER_CALL(name); \
1518 } \
1519 EXPORT_SYMBOL(bpf_dispatcher_##name##_func); \
1520 struct bpf_dispatcher bpf_dispatcher_##name = \
1521 BPF_DISPATCHER_INIT(bpf_dispatcher_##name);
1522
1523#define DECLARE_BPF_DISPATCHER(name) \
1524 unsigned int bpf_dispatcher_##name##_func( \
1525 const void *ctx, \
1526 const struct bpf_insn *insnsi, \
1527 bpf_func_t bpf_func); \
1528 extern struct bpf_dispatcher bpf_dispatcher_##name;
1529
1530#define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_##name##_func
1531#define BPF_DISPATCHER_PTR(name) (&bpf_dispatcher_##name)
1532void bpf_dispatcher_change_prog(struct bpf_dispatcher *d, struct bpf_prog *from,
1533 struct bpf_prog *to);
1534/* Called only from JIT-enabled code, so there's no need for stubs. */
1535void bpf_image_ksym_init(void *data, unsigned int size, struct bpf_ksym *ksym);
1536void bpf_image_ksym_add(struct bpf_ksym *ksym);
1537void bpf_image_ksym_del(struct bpf_ksym *ksym);
1538void bpf_ksym_add(struct bpf_ksym *ksym);
1539void bpf_ksym_del(struct bpf_ksym *ksym);
1540bool bpf_has_frame_pointer(unsigned long ip);
1541int bpf_jit_charge_modmem(u32 size);
1542void bpf_jit_uncharge_modmem(u32 size);
1543bool bpf_prog_has_trampoline(const struct bpf_prog *prog);
1544#else
1545static inline int bpf_trampoline_link_prog(struct bpf_tramp_link *link,
1546 struct bpf_trampoline *tr,
1547 struct bpf_prog *tgt_prog)
1548{
1549 return -ENOTSUPP;
1550}
1551static inline int bpf_trampoline_unlink_prog(struct bpf_tramp_link *link,
1552 struct bpf_trampoline *tr,
1553 struct bpf_prog *tgt_prog)
1554{
1555 return -ENOTSUPP;
1556}
1557static inline struct bpf_trampoline *bpf_trampoline_get(u64 key,
1558 struct bpf_attach_target_info *tgt_info)
1559{
1560 return NULL;
1561}
1562static inline void bpf_trampoline_put(struct bpf_trampoline *tr) {}
1563#define DEFINE_BPF_DISPATCHER(name)
1564#define DECLARE_BPF_DISPATCHER(name)
1565#define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_nop_func
1566#define BPF_DISPATCHER_PTR(name) NULL
1567static inline void bpf_dispatcher_change_prog(struct bpf_dispatcher *d,
1568 struct bpf_prog *from,
1569 struct bpf_prog *to) {}
1570static inline bool is_bpf_image_address(unsigned long address)
1571{
1572 return false;
1573}
1574static inline bool bpf_prog_has_trampoline(const struct bpf_prog *prog)
1575{
1576 return false;
1577}
1578#endif
1579
1580struct bpf_func_info_aux {
1581 u16 linkage;
1582 bool unreliable;
1583 bool called : 1;
1584 bool verified : 1;
1585};
1586
1587enum bpf_jit_poke_reason {
1588 BPF_POKE_REASON_TAIL_CALL,
1589};
1590
1591/* Descriptor of pokes pointing /into/ the JITed image. */
1592struct bpf_jit_poke_descriptor {
1593 void *tailcall_target;
1594 void *tailcall_bypass;
1595 void *bypass_addr;
1596 void *aux;
1597 union {
1598 struct {
1599 struct bpf_map *map;
1600 u32 key;
1601 } tail_call;
1602 };
1603 bool tailcall_target_stable;
1604 u8 adj_off;
1605 u16 reason;
1606 u32 insn_idx;
1607};
1608
1609/* reg_type info for ctx arguments */
1610struct bpf_ctx_arg_aux {
1611 u32 offset;
1612 enum bpf_reg_type reg_type;
1613 struct btf *btf;
1614 u32 btf_id;
1615 u32 ref_obj_id;
1616 bool refcounted;
1617};
1618
1619struct btf_mod_pair {
1620 struct btf *btf;
1621 struct module *module;
1622};
1623
1624struct bpf_kfunc_desc_tab;
1625
1626enum bpf_stream_id {
1627 BPF_STDOUT = 1,
1628 BPF_STDERR = 2,
1629};
1630
1631struct bpf_stream_elem {
1632 struct llist_node node;
1633 int total_len;
1634 int consumed_len;
1635 char str[];
1636};
1637
1638enum {
1639 /* 100k bytes */
1640 BPF_STREAM_MAX_CAPACITY = 100000ULL,
1641};
1642
1643struct bpf_stream {
1644 atomic_t capacity;
1645 struct llist_head log; /* list of in-flight stream elements in LIFO order */
1646
1647 struct mutex lock; /* lock protecting backlog_{head,tail} */
1648 struct llist_node *backlog_head; /* list of in-flight stream elements in FIFO order */
1649 struct llist_node *backlog_tail; /* tail of the list above */
1650};
1651
1652struct bpf_stream_stage {
1653 struct llist_head log;
1654 int len;
1655};
1656
1657struct bpf_prog_aux {
1658 atomic64_t refcnt;
1659 u32 used_map_cnt;
1660 u32 used_btf_cnt;
1661 u32 max_ctx_offset;
1662 u32 max_pkt_offset;
1663 u32 max_tp_access;
1664 u32 stack_depth;
1665 u32 id;
1666 u32 func_cnt; /* used by non-func prog as the number of func progs */
1667 u32 real_func_cnt; /* includes hidden progs, only used for JIT and freeing progs */
1668 u32 func_idx; /* 0 for non-func prog, the index in func array for func prog */
1669 u32 attach_btf_id; /* in-kernel BTF type id to attach to */
1670 u32 attach_st_ops_member_off;
1671 u32 ctx_arg_info_size;
1672 u32 max_rdonly_access;
1673 u32 max_rdwr_access;
1674 u32 subprog_start;
1675 struct btf *attach_btf;
1676 struct bpf_ctx_arg_aux *ctx_arg_info;
1677 void __percpu *priv_stack_ptr;
1678 struct mutex dst_mutex; /* protects dst_* pointers below, *after* prog becomes visible */
1679 struct bpf_prog *dst_prog;
1680 struct bpf_trampoline *dst_trampoline;
1681 enum bpf_prog_type saved_dst_prog_type;
1682 enum bpf_attach_type saved_dst_attach_type;
1683 bool verifier_zext; /* Zero extensions has been inserted by verifier. */
1684 bool dev_bound; /* Program is bound to the netdev. */
1685 bool offload_requested; /* Program is bound and offloaded to the netdev. */
1686 bool attach_btf_trace; /* true if attaching to BTF-enabled raw tp */
1687 bool attach_tracing_prog; /* true if tracing another tracing program */
1688 bool func_proto_unreliable;
1689 bool tail_call_reachable;
1690 bool xdp_has_frags;
1691 bool exception_cb;
1692 bool exception_boundary;
1693 bool is_extended; /* true if extended by freplace program */
1694 bool jits_use_priv_stack;
1695 bool priv_stack_requested;
1696 bool changes_pkt_data;
1697 bool might_sleep;
1698 bool kprobe_write_ctx;
1699 u64 prog_array_member_cnt; /* counts how many times as member of prog_array */
1700 struct mutex ext_mutex; /* mutex for is_extended and prog_array_member_cnt */
1701 struct bpf_arena *arena;
1702 void (*recursion_detected)(struct bpf_prog *prog); /* callback if recursion is detected */
1703 /* BTF_KIND_FUNC_PROTO for valid attach_btf_id */
1704 const struct btf_type *attach_func_proto;
1705 /* function name for valid attach_btf_id */
1706 const char *attach_func_name;
1707 struct bpf_prog **func;
1708 struct bpf_prog_aux *main_prog_aux;
1709 void *jit_data; /* JIT specific data. arch dependent */
1710 struct bpf_jit_poke_descriptor *poke_tab;
1711 struct bpf_kfunc_desc_tab *kfunc_tab;
1712 struct bpf_kfunc_btf_tab *kfunc_btf_tab;
1713 u32 size_poke_tab;
1714#ifdef CONFIG_FINEIBT
1715 struct bpf_ksym ksym_prefix;
1716#endif
1717 struct bpf_ksym ksym;
1718 const struct bpf_prog_ops *ops;
1719 const struct bpf_struct_ops *st_ops;
1720 struct bpf_map **used_maps;
1721 struct mutex used_maps_mutex; /* mutex for used_maps and used_map_cnt */
1722 struct btf_mod_pair *used_btfs;
1723 struct bpf_prog *prog;
1724 struct user_struct *user;
1725 u64 load_time; /* ns since boottime */
1726 u32 verified_insns;
1727 int cgroup_atype; /* enum cgroup_bpf_attach_type */
1728 struct bpf_map *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
1729 char name[BPF_OBJ_NAME_LEN];
1730 u64 (*bpf_exception_cb)(u64 cookie, u64 sp, u64 bp, u64, u64);
1731#ifdef CONFIG_SECURITY
1732 void *security;
1733#endif
1734 struct bpf_token *token;
1735 struct bpf_prog_offload *offload;
1736 struct btf *btf;
1737 struct bpf_func_info *func_info;
1738 struct bpf_func_info_aux *func_info_aux;
1739 /* bpf_line_info loaded from userspace. linfo->insn_off
1740 * has the xlated insn offset.
1741 * Both the main and sub prog share the same linfo.
1742 * The subprog can access its first linfo by
1743 * using the linfo_idx.
1744 */
1745 struct bpf_line_info *linfo;
1746 /* jited_linfo is the jited addr of the linfo. It has a
1747 * one to one mapping to linfo:
1748 * jited_linfo[i] is the jited addr for the linfo[i]->insn_off.
1749 * Both the main and sub prog share the same jited_linfo.
1750 * The subprog can access its first jited_linfo by
1751 * using the linfo_idx.
1752 */
1753 void **jited_linfo;
1754 u32 func_info_cnt;
1755 u32 nr_linfo;
1756 /* subprog can use linfo_idx to access its first linfo and
1757 * jited_linfo.
1758 * main prog always has linfo_idx == 0
1759 */
1760 u32 linfo_idx;
1761 struct module *mod;
1762 u32 num_exentries;
1763 struct exception_table_entry *extable;
1764 union {
1765 struct work_struct work;
1766 struct rcu_head rcu;
1767 };
1768 struct bpf_stream stream[2];
1769 struct mutex st_ops_assoc_mutex;
1770 struct bpf_map __rcu *st_ops_assoc;
1771};
1772
1773#define BPF_NR_CONTEXTS 4 /* normal, softirq, hardirq, NMI */
1774
1775struct bpf_prog {
1776 u16 pages; /* Number of allocated pages */
1777 u16 jited:1, /* Is our filter JIT'ed? */
1778 jit_requested:1,/* archs need to JIT the prog */
1779 gpl_compatible:1, /* Is filter GPL compatible? */
1780 cb_access:1, /* Is control block accessed? */
1781 dst_needed:1, /* Do we need dst entry? */
1782 blinding_requested:1, /* needs constant blinding */
1783 blinded:1, /* Was blinded */
1784 is_func:1, /* program is a bpf function */
1785 kprobe_override:1, /* Do we override a kprobe? */
1786 has_callchain_buf:1, /* callchain buffer allocated? */
1787 enforce_expected_attach_type:1, /* Enforce expected_attach_type checking at attach time */
1788 call_get_stack:1, /* Do we call bpf_get_stack() or bpf_get_stackid() */
1789 call_get_func_ip:1, /* Do we call get_func_ip() */
1790 call_session_cookie:1, /* Do we call bpf_session_cookie() */
1791 tstamp_type_access:1, /* Accessed __sk_buff->tstamp_type */
1792 sleepable:1; /* BPF program is sleepable */
1793 enum bpf_prog_type type; /* Type of BPF program */
1794 enum bpf_attach_type expected_attach_type; /* For some prog types */
1795 u32 len; /* Number of filter blocks */
1796 u32 jited_len; /* Size of jited insns in bytes */
1797 union {
1798 u8 digest[SHA256_DIGEST_SIZE];
1799 u8 tag[BPF_TAG_SIZE];
1800 };
1801 struct bpf_prog_stats __percpu *stats;
1802 u8 __percpu *active; /* u8[BPF_NR_CONTEXTS] for recursion protection */
1803 unsigned int (*bpf_func)(const void *ctx,
1804 const struct bpf_insn *insn);
1805 struct bpf_prog_aux *aux; /* Auxiliary fields */
1806 struct sock_fprog_kern *orig_prog; /* Original BPF program */
1807 /* Instructions for interpreter */
1808 union {
1809 DECLARE_FLEX_ARRAY(struct sock_filter, insns);
1810 DECLARE_FLEX_ARRAY(struct bpf_insn, insnsi);
1811 };
1812};
1813
1814struct bpf_array_aux {
1815 /* Programs with direct jumps into programs part of this array. */
1816 struct list_head poke_progs;
1817 struct bpf_map *map;
1818 struct mutex poke_mutex;
1819 struct work_struct work;
1820};
1821
1822struct bpf_link {
1823 atomic64_t refcnt;
1824 u32 id;
1825 enum bpf_link_type type;
1826 const struct bpf_link_ops *ops;
1827 struct bpf_prog *prog;
1828
1829 u32 flags;
1830 enum bpf_attach_type attach_type;
1831
1832 /* rcu is used before freeing, work can be used to schedule that
1833 * RCU-based freeing before that, so they never overlap
1834 */
1835 union {
1836 struct rcu_head rcu;
1837 struct work_struct work;
1838 };
1839 /* whether BPF link itself has "sleepable" semantics, which can differ
1840 * from underlying BPF program having a "sleepable" semantics, as BPF
1841 * link's semantics is determined by target attach hook
1842 */
1843 bool sleepable;
1844};
1845
1846struct bpf_link_ops {
1847 void (*release)(struct bpf_link *link);
1848 /* deallocate link resources callback, called without RCU grace period
1849 * waiting
1850 */
1851 void (*dealloc)(struct bpf_link *link);
1852 /* deallocate link resources callback, called after RCU grace period;
1853 * if either the underlying BPF program is sleepable or BPF link's
1854 * target hook is sleepable, we'll go through tasks trace RCU GP and
1855 * then "classic" RCU GP; this need for chaining tasks trace and
1856 * classic RCU GPs is designated by setting bpf_link->sleepable flag
1857 */
1858 void (*dealloc_deferred)(struct bpf_link *link);
1859 int (*detach)(struct bpf_link *link);
1860 int (*update_prog)(struct bpf_link *link, struct bpf_prog *new_prog,
1861 struct bpf_prog *old_prog);
1862 void (*show_fdinfo)(const struct bpf_link *link, struct seq_file *seq);
1863 int (*fill_link_info)(const struct bpf_link *link,
1864 struct bpf_link_info *info);
1865 int (*update_map)(struct bpf_link *link, struct bpf_map *new_map,
1866 struct bpf_map *old_map);
1867 __poll_t (*poll)(struct file *file, struct poll_table_struct *pts);
1868};
1869
1870struct bpf_tramp_link {
1871 struct bpf_link link;
1872 struct hlist_node tramp_hlist;
1873 u64 cookie;
1874};
1875
1876struct bpf_shim_tramp_link {
1877 struct bpf_tramp_link link;
1878 struct bpf_trampoline *trampoline;
1879};
1880
1881struct bpf_tracing_link {
1882 struct bpf_tramp_link link;
1883 struct bpf_trampoline *trampoline;
1884 struct bpf_prog *tgt_prog;
1885};
1886
1887struct bpf_fsession_link {
1888 struct bpf_tracing_link link;
1889 struct bpf_tramp_link fexit;
1890};
1891
1892struct bpf_raw_tp_link {
1893 struct bpf_link link;
1894 struct bpf_raw_event_map *btp;
1895 u64 cookie;
1896};
1897
1898struct bpf_link_primer {
1899 struct bpf_link *link;
1900 struct file *file;
1901 int fd;
1902 u32 id;
1903};
1904
1905struct bpf_mount_opts {
1906 kuid_t uid;
1907 kgid_t gid;
1908 umode_t mode;
1909
1910 /* BPF token-related delegation options */
1911 u64 delegate_cmds;
1912 u64 delegate_maps;
1913 u64 delegate_progs;
1914 u64 delegate_attachs;
1915};
1916
1917struct bpf_token {
1918 struct work_struct work;
1919 atomic64_t refcnt;
1920 struct user_namespace *userns;
1921 u64 allowed_cmds;
1922 u64 allowed_maps;
1923 u64 allowed_progs;
1924 u64 allowed_attachs;
1925#ifdef CONFIG_SECURITY
1926 void *security;
1927#endif
1928};
1929
1930struct bpf_struct_ops_value;
1931struct btf_member;
1932
1933#define BPF_STRUCT_OPS_MAX_NR_MEMBERS 64
1934/**
1935 * struct bpf_struct_ops - A structure of callbacks allowing a subsystem to
1936 * define a BPF_MAP_TYPE_STRUCT_OPS map type composed
1937 * of BPF_PROG_TYPE_STRUCT_OPS progs.
1938 * @verifier_ops: A structure of callbacks that are invoked by the verifier
1939 * when determining whether the struct_ops progs in the
1940 * struct_ops map are valid.
1941 * @init: A callback that is invoked a single time, and before any other
1942 * callback, to initialize the structure. A nonzero return value means
1943 * the subsystem could not be initialized.
1944 * @check_member: When defined, a callback invoked by the verifier to allow
1945 * the subsystem to determine if an entry in the struct_ops map
1946 * is valid. A nonzero return value means that the map is
1947 * invalid and should be rejected by the verifier.
1948 * @init_member: A callback that is invoked for each member of the struct_ops
1949 * map to allow the subsystem to initialize the member. A nonzero
1950 * value means the member could not be initialized. This callback
1951 * is exclusive with the @type, @type_id, @value_type, and
1952 * @value_id fields.
1953 * @reg: A callback that is invoked when the struct_ops map has been
1954 * initialized and is being attached to. Zero means the struct_ops map
1955 * has been successfully registered and is live. A nonzero return value
1956 * means the struct_ops map could not be registered.
1957 * @unreg: A callback that is invoked when the struct_ops map should be
1958 * unregistered.
1959 * @update: A callback that is invoked when the live struct_ops map is being
1960 * updated to contain new values. This callback is only invoked when
1961 * the struct_ops map is loaded with BPF_F_LINK. If not defined, the
1962 * it is assumed that the struct_ops map cannot be updated.
1963 * @validate: A callback that is invoked after all of the members have been
1964 * initialized. This callback should perform static checks on the
1965 * map, meaning that it should either fail or succeed
1966 * deterministically. A struct_ops map that has been validated may
1967 * not necessarily succeed in being registered if the call to @reg
1968 * fails. For example, a valid struct_ops map may be loaded, but
1969 * then fail to be registered due to there being another active
1970 * struct_ops map on the system in the subsystem already. For this
1971 * reason, if this callback is not defined, the check is skipped as
1972 * the struct_ops map will have final verification performed in
1973 * @reg.
1974 * @cfi_stubs: Pointer to a structure of stub functions for CFI. These stubs
1975 * provide the correct Control Flow Integrity hashes for the
1976 * trampolines generated by BPF struct_ops.
1977 * @owner: The module that owns this struct_ops. Used for module reference
1978 * counting to ensure the module providing the struct_ops cannot be
1979 * unloaded while in use.
1980 * @name: The name of the struct bpf_struct_ops object.
1981 * @func_models: Func models
1982 */
1983struct bpf_struct_ops {
1984 const struct bpf_verifier_ops *verifier_ops;
1985 int (*init)(struct btf *btf);
1986 int (*check_member)(const struct btf_type *t,
1987 const struct btf_member *member,
1988 const struct bpf_prog *prog);
1989 int (*init_member)(const struct btf_type *t,
1990 const struct btf_member *member,
1991 void *kdata, const void *udata);
1992 int (*reg)(void *kdata, struct bpf_link *link);
1993 void (*unreg)(void *kdata, struct bpf_link *link);
1994 int (*update)(void *kdata, void *old_kdata, struct bpf_link *link);
1995 int (*validate)(void *kdata);
1996 void *cfi_stubs;
1997 struct module *owner;
1998 const char *name;
1999 struct btf_func_model func_models[BPF_STRUCT_OPS_MAX_NR_MEMBERS];
2000};
2001
2002/* Every member of a struct_ops type has an instance even a member is not
2003 * an operator (function pointer). The "info" field will be assigned to
2004 * prog->aux->ctx_arg_info of BPF struct_ops programs to provide the
2005 * argument information required by the verifier to verify the program.
2006 *
2007 * btf_ctx_access() will lookup prog->aux->ctx_arg_info to find the
2008 * corresponding entry for an given argument.
2009 */
2010struct bpf_struct_ops_arg_info {
2011 struct bpf_ctx_arg_aux *info;
2012 u32 cnt;
2013};
2014
2015struct bpf_struct_ops_desc {
2016 struct bpf_struct_ops *st_ops;
2017
2018 const struct btf_type *type;
2019 const struct btf_type *value_type;
2020 u32 type_id;
2021 u32 value_id;
2022
2023 /* Collection of argument information for each member */
2024 struct bpf_struct_ops_arg_info *arg_info;
2025};
2026
2027enum bpf_struct_ops_state {
2028 BPF_STRUCT_OPS_STATE_INIT,
2029 BPF_STRUCT_OPS_STATE_INUSE,
2030 BPF_STRUCT_OPS_STATE_TOBEFREE,
2031 BPF_STRUCT_OPS_STATE_READY,
2032};
2033
2034struct bpf_struct_ops_common_value {
2035 refcount_t refcnt;
2036 enum bpf_struct_ops_state state;
2037};
2038
2039static inline bool bpf_prog_get_recursion_context(struct bpf_prog *prog)
2040{
2041#ifdef CONFIG_ARM64
2042 u8 rctx = interrupt_context_level();
2043 u8 *active = this_cpu_ptr(prog->active);
2044 u32 val;
2045
2046 preempt_disable();
2047 active[rctx]++;
2048 val = le32_to_cpu(*(__le32 *)active);
2049 preempt_enable();
2050 if (val != BIT(rctx * 8))
2051 return false;
2052
2053 return true;
2054#else
2055 return this_cpu_inc_return(*(int __percpu *)(prog->active)) == 1;
2056#endif
2057}
2058
2059static inline void bpf_prog_put_recursion_context(struct bpf_prog *prog)
2060{
2061#ifdef CONFIG_ARM64
2062 u8 rctx = interrupt_context_level();
2063 u8 *active = this_cpu_ptr(prog->active);
2064
2065 preempt_disable();
2066 active[rctx]--;
2067 preempt_enable();
2068#else
2069 this_cpu_dec(*(int __percpu *)(prog->active));
2070#endif
2071}
2072
2073#if defined(CONFIG_BPF_JIT) && defined(CONFIG_BPF_SYSCALL)
2074/* This macro helps developer to register a struct_ops type and generate
2075 * type information correctly. Developers should use this macro to register
2076 * a struct_ops type instead of calling __register_bpf_struct_ops() directly.
2077 */
2078#define register_bpf_struct_ops(st_ops, type) \
2079 ({ \
2080 struct bpf_struct_ops_##type { \
2081 struct bpf_struct_ops_common_value common; \
2082 struct type data ____cacheline_aligned_in_smp; \
2083 }; \
2084 BTF_TYPE_EMIT(struct bpf_struct_ops_##type); \
2085 __register_bpf_struct_ops(st_ops); \
2086 })
2087#define BPF_MODULE_OWNER ((void *)((0xeB9FUL << 2) + POISON_POINTER_DELTA))
2088bool bpf_struct_ops_get(const void *kdata);
2089void bpf_struct_ops_put(const void *kdata);
2090int bpf_struct_ops_supported(const struct bpf_struct_ops *st_ops, u32 moff);
2091int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map, void *key,
2092 void *value);
2093int bpf_struct_ops_prepare_trampoline(struct bpf_tramp_links *tlinks,
2094 struct bpf_tramp_link *link,
2095 const struct btf_func_model *model,
2096 void *stub_func,
2097 void **image, u32 *image_off,
2098 bool allow_alloc);
2099void bpf_struct_ops_image_free(void *image);
2100static inline bool bpf_try_module_get(const void *data, struct module *owner)
2101{
2102 if (owner == BPF_MODULE_OWNER)
2103 return bpf_struct_ops_get(data);
2104 else
2105 return try_module_get(owner);
2106}
2107static inline void bpf_module_put(const void *data, struct module *owner)
2108{
2109 if (owner == BPF_MODULE_OWNER)
2110 bpf_struct_ops_put(data);
2111 else
2112 module_put(owner);
2113}
2114int bpf_struct_ops_link_create(union bpf_attr *attr);
2115int bpf_prog_assoc_struct_ops(struct bpf_prog *prog, struct bpf_map *map);
2116void bpf_prog_disassoc_struct_ops(struct bpf_prog *prog);
2117void *bpf_prog_get_assoc_struct_ops(const struct bpf_prog_aux *aux);
2118u32 bpf_struct_ops_id(const void *kdata);
2119
2120#ifdef CONFIG_NET
2121/* Define it here to avoid the use of forward declaration */
2122struct bpf_dummy_ops_state {
2123 int val;
2124};
2125
2126struct bpf_dummy_ops {
2127 int (*test_1)(struct bpf_dummy_ops_state *cb);
2128 int (*test_2)(struct bpf_dummy_ops_state *cb, int a1, unsigned short a2,
2129 char a3, unsigned long a4);
2130 int (*test_sleepable)(struct bpf_dummy_ops_state *cb);
2131};
2132
2133int bpf_struct_ops_test_run(struct bpf_prog *prog, const union bpf_attr *kattr,
2134 union bpf_attr __user *uattr);
2135#endif
2136int bpf_struct_ops_desc_init(struct bpf_struct_ops_desc *st_ops_desc,
2137 struct btf *btf,
2138 struct bpf_verifier_log *log);
2139void bpf_map_struct_ops_info_fill(struct bpf_map_info *info, struct bpf_map *map);
2140void bpf_struct_ops_desc_release(struct bpf_struct_ops_desc *st_ops_desc);
2141#else
2142#define register_bpf_struct_ops(st_ops, type) ({ (void *)(st_ops); 0; })
2143static inline bool bpf_try_module_get(const void *data, struct module *owner)
2144{
2145 return try_module_get(owner);
2146}
2147static inline void bpf_module_put(const void *data, struct module *owner)
2148{
2149 module_put(owner);
2150}
2151static inline int bpf_struct_ops_supported(const struct bpf_struct_ops *st_ops, u32 moff)
2152{
2153 return -ENOTSUPP;
2154}
2155static inline int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map,
2156 void *key,
2157 void *value)
2158{
2159 return -EINVAL;
2160}
2161static inline int bpf_struct_ops_link_create(union bpf_attr *attr)
2162{
2163 return -EOPNOTSUPP;
2164}
2165static inline int bpf_prog_assoc_struct_ops(struct bpf_prog *prog, struct bpf_map *map)
2166{
2167 return -EOPNOTSUPP;
2168}
2169static inline void bpf_prog_disassoc_struct_ops(struct bpf_prog *prog)
2170{
2171}
2172static inline void *bpf_prog_get_assoc_struct_ops(const struct bpf_prog_aux *aux)
2173{
2174 return NULL;
2175}
2176static inline void bpf_map_struct_ops_info_fill(struct bpf_map_info *info, struct bpf_map *map)
2177{
2178}
2179
2180static inline void bpf_struct_ops_desc_release(struct bpf_struct_ops_desc *st_ops_desc)
2181{
2182}
2183
2184#endif
2185
2186static inline int bpf_fsession_cnt(struct bpf_tramp_links *links)
2187{
2188 struct bpf_tramp_links fentries = links[BPF_TRAMP_FENTRY];
2189 int cnt = 0;
2190
2191 for (int i = 0; i < links[BPF_TRAMP_FENTRY].nr_links; i++) {
2192 if (fentries.links[i]->link.prog->expected_attach_type == BPF_TRACE_FSESSION)
2193 cnt++;
2194 }
2195
2196 return cnt;
2197}
2198
2199static inline bool bpf_prog_calls_session_cookie(struct bpf_tramp_link *link)
2200{
2201 return link->link.prog->call_session_cookie;
2202}
2203
2204static inline int bpf_fsession_cookie_cnt(struct bpf_tramp_links *links)
2205{
2206 struct bpf_tramp_links fentries = links[BPF_TRAMP_FENTRY];
2207 int cnt = 0;
2208
2209 for (int i = 0; i < links[BPF_TRAMP_FENTRY].nr_links; i++) {
2210 if (bpf_prog_calls_session_cookie(fentries.links[i]))
2211 cnt++;
2212 }
2213
2214 return cnt;
2215}
2216
2217int bpf_prog_ctx_arg_info_init(struct bpf_prog *prog,
2218 const struct bpf_ctx_arg_aux *info, u32 cnt);
2219
2220#if defined(CONFIG_CGROUP_BPF) && defined(CONFIG_BPF_LSM)
2221int bpf_trampoline_link_cgroup_shim(struct bpf_prog *prog,
2222 int cgroup_atype,
2223 enum bpf_attach_type attach_type);
2224void bpf_trampoline_unlink_cgroup_shim(struct bpf_prog *prog);
2225#else
2226static inline int bpf_trampoline_link_cgroup_shim(struct bpf_prog *prog,
2227 int cgroup_atype,
2228 enum bpf_attach_type attach_type)
2229{
2230 return -EOPNOTSUPP;
2231}
2232static inline void bpf_trampoline_unlink_cgroup_shim(struct bpf_prog *prog)
2233{
2234}
2235#endif
2236
2237struct bpf_array {
2238 struct bpf_map map;
2239 u32 elem_size;
2240 u32 index_mask;
2241 struct bpf_array_aux *aux;
2242 union {
2243 DECLARE_FLEX_ARRAY(char, value) __aligned(8);
2244 DECLARE_FLEX_ARRAY(void *, ptrs) __aligned(8);
2245 DECLARE_FLEX_ARRAY(void __percpu *, pptrs) __aligned(8);
2246 };
2247};
2248
2249/*
2250 * The bpf_array_get_next_key() function may be used for all array-like
2251 * maps, i.e., maps with u32 keys with range [0 ,..., max_entries)
2252 */
2253int bpf_array_get_next_key(struct bpf_map *map, void *key, void *next_key);
2254
2255#define BPF_COMPLEXITY_LIMIT_INSNS 1000000 /* yes. 1M insns */
2256#define MAX_TAIL_CALL_CNT 33
2257
2258/* Maximum number of loops for bpf_loop and bpf_iter_num.
2259 * It's enum to expose it (and thus make it discoverable) through BTF.
2260 */
2261enum {
2262 BPF_MAX_LOOPS = 8 * 1024 * 1024,
2263 BPF_MAX_TIMED_LOOPS = 0xffff,
2264};
2265
2266#define BPF_F_ACCESS_MASK (BPF_F_RDONLY | \
2267 BPF_F_RDONLY_PROG | \
2268 BPF_F_WRONLY | \
2269 BPF_F_WRONLY_PROG)
2270
2271#define BPF_MAP_CAN_READ BIT(0)
2272#define BPF_MAP_CAN_WRITE BIT(1)
2273
2274/* Maximum number of user-producer ring buffer samples that can be drained in
2275 * a call to bpf_user_ringbuf_drain().
2276 */
2277#define BPF_MAX_USER_RINGBUF_SAMPLES (128 * 1024)
2278
2279static inline u32 bpf_map_flags_to_cap(struct bpf_map *map)
2280{
2281 u32 access_flags = map->map_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
2282
2283 /* Combination of BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG is
2284 * not possible.
2285 */
2286 if (access_flags & BPF_F_RDONLY_PROG)
2287 return BPF_MAP_CAN_READ;
2288 else if (access_flags & BPF_F_WRONLY_PROG)
2289 return BPF_MAP_CAN_WRITE;
2290 else
2291 return BPF_MAP_CAN_READ | BPF_MAP_CAN_WRITE;
2292}
2293
2294static inline bool bpf_map_flags_access_ok(u32 access_flags)
2295{
2296 return (access_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG)) !=
2297 (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
2298}
2299
2300static inline struct bpf_map_owner *bpf_map_owner_alloc(struct bpf_map *map)
2301{
2302 return kzalloc_obj(*map->owner, GFP_ATOMIC);
2303}
2304
2305static inline void bpf_map_owner_free(struct bpf_map *map)
2306{
2307 kfree(map->owner);
2308}
2309
2310struct bpf_event_entry {
2311 struct perf_event *event;
2312 struct file *perf_file;
2313 struct file *map_file;
2314 struct rcu_head rcu;
2315};
2316
2317static inline bool map_type_contains_progs(struct bpf_map *map)
2318{
2319 return map->map_type == BPF_MAP_TYPE_PROG_ARRAY ||
2320 map->map_type == BPF_MAP_TYPE_DEVMAP ||
2321 map->map_type == BPF_MAP_TYPE_CPUMAP;
2322}
2323
2324bool bpf_prog_map_compatible(struct bpf_map *map, const struct bpf_prog *fp);
2325int bpf_prog_calc_tag(struct bpf_prog *fp);
2326
2327const struct bpf_func_proto *bpf_get_trace_printk_proto(void);
2328const struct bpf_func_proto *bpf_get_trace_vprintk_proto(void);
2329
2330const struct bpf_func_proto *bpf_get_perf_event_read_value_proto(void);
2331
2332typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src,
2333 unsigned long off, unsigned long len);
2334typedef u32 (*bpf_convert_ctx_access_t)(enum bpf_access_type type,
2335 const struct bpf_insn *src,
2336 struct bpf_insn *dst,
2337 struct bpf_prog *prog,
2338 u32 *target_size);
2339
2340u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size,
2341 void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy);
2342
2343/* an array of programs to be executed under rcu_lock.
2344 *
2345 * Typical usage:
2346 * ret = bpf_prog_run_array(rcu_dereference(&bpf_prog_array), ctx, bpf_prog_run);
2347 *
2348 * the structure returned by bpf_prog_array_alloc() should be populated
2349 * with program pointers and the last pointer must be NULL.
2350 * The user has to keep refcnt on the program and make sure the program
2351 * is removed from the array before bpf_prog_put().
2352 * The 'struct bpf_prog_array *' should only be replaced with xchg()
2353 * since other cpus are walking the array of pointers in parallel.
2354 */
2355struct bpf_prog_array_item {
2356 struct bpf_prog *prog;
2357 union {
2358 struct bpf_cgroup_storage *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
2359 u64 bpf_cookie;
2360 };
2361};
2362
2363struct bpf_prog_array {
2364 struct rcu_head rcu;
2365 struct bpf_prog_array_item items[];
2366};
2367
2368struct bpf_empty_prog_array {
2369 struct bpf_prog_array hdr;
2370 struct bpf_prog *null_prog;
2371};
2372
2373/* to avoid allocating empty bpf_prog_array for cgroups that
2374 * don't have bpf program attached use one global 'bpf_empty_prog_array'
2375 * It will not be modified the caller of bpf_prog_array_alloc()
2376 * (since caller requested prog_cnt == 0)
2377 * that pointer should be 'freed' by bpf_prog_array_free()
2378 */
2379extern struct bpf_empty_prog_array bpf_empty_prog_array;
2380
2381struct bpf_prog_array *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags);
2382void bpf_prog_array_free(struct bpf_prog_array *progs);
2383/* Use when traversal over the bpf_prog_array uses tasks_trace rcu */
2384void bpf_prog_array_free_sleepable(struct bpf_prog_array *progs);
2385int bpf_prog_array_length(struct bpf_prog_array *progs);
2386bool bpf_prog_array_is_empty(struct bpf_prog_array *array);
2387int bpf_prog_array_copy_to_user(struct bpf_prog_array *progs,
2388 __u32 __user *prog_ids, u32 cnt);
2389
2390void bpf_prog_array_delete_safe(struct bpf_prog_array *progs,
2391 struct bpf_prog *old_prog);
2392int bpf_prog_array_delete_safe_at(struct bpf_prog_array *array, int index);
2393int bpf_prog_array_update_at(struct bpf_prog_array *array, int index,
2394 struct bpf_prog *prog);
2395int bpf_prog_array_copy_info(struct bpf_prog_array *array,
2396 u32 *prog_ids, u32 request_cnt,
2397 u32 *prog_cnt);
2398int bpf_prog_array_copy(struct bpf_prog_array *old_array,
2399 struct bpf_prog *exclude_prog,
2400 struct bpf_prog *include_prog,
2401 u64 bpf_cookie,
2402 struct bpf_prog_array **new_array);
2403
2404struct bpf_run_ctx {};
2405
2406struct bpf_cg_run_ctx {
2407 struct bpf_run_ctx run_ctx;
2408 const struct bpf_prog_array_item *prog_item;
2409 int retval;
2410};
2411
2412struct bpf_trace_run_ctx {
2413 struct bpf_run_ctx run_ctx;
2414 u64 bpf_cookie;
2415 bool is_uprobe;
2416};
2417
2418struct bpf_tramp_run_ctx {
2419 struct bpf_run_ctx run_ctx;
2420 u64 bpf_cookie;
2421 struct bpf_run_ctx *saved_run_ctx;
2422};
2423
2424static inline struct bpf_run_ctx *bpf_set_run_ctx(struct bpf_run_ctx *new_ctx)
2425{
2426 struct bpf_run_ctx *old_ctx = NULL;
2427
2428#ifdef CONFIG_BPF_SYSCALL
2429 old_ctx = current->bpf_ctx;
2430 current->bpf_ctx = new_ctx;
2431#endif
2432 return old_ctx;
2433}
2434
2435static inline void bpf_reset_run_ctx(struct bpf_run_ctx *old_ctx)
2436{
2437#ifdef CONFIG_BPF_SYSCALL
2438 current->bpf_ctx = old_ctx;
2439#endif
2440}
2441
2442/* BPF program asks to bypass CAP_NET_BIND_SERVICE in bind. */
2443#define BPF_RET_BIND_NO_CAP_NET_BIND_SERVICE (1 << 0)
2444/* BPF program asks to set CN on the packet. */
2445#define BPF_RET_SET_CN (1 << 0)
2446
2447typedef u32 (*bpf_prog_run_fn)(const struct bpf_prog *prog, const void *ctx);
2448
2449static __always_inline u32
2450bpf_prog_run_array(const struct bpf_prog_array *array,
2451 const void *ctx, bpf_prog_run_fn run_prog)
2452{
2453 const struct bpf_prog_array_item *item;
2454 const struct bpf_prog *prog;
2455 struct bpf_run_ctx *old_run_ctx;
2456 struct bpf_trace_run_ctx run_ctx;
2457 u32 ret = 1;
2458
2459 RCU_LOCKDEP_WARN(!rcu_read_lock_held(), "no rcu lock held");
2460
2461 if (unlikely(!array))
2462 return ret;
2463
2464 run_ctx.is_uprobe = false;
2465
2466 migrate_disable();
2467 old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
2468 item = &array->items[0];
2469 while ((prog = READ_ONCE(item->prog))) {
2470 run_ctx.bpf_cookie = item->bpf_cookie;
2471 ret &= run_prog(prog, ctx);
2472 item++;
2473 }
2474 bpf_reset_run_ctx(old_run_ctx);
2475 migrate_enable();
2476 return ret;
2477}
2478
2479/* Notes on RCU design for bpf_prog_arrays containing sleepable programs:
2480 *
2481 * We use the tasks_trace rcu flavor read section to protect the bpf_prog_array
2482 * overall. As a result, we must use the bpf_prog_array_free_sleepable
2483 * in order to use the tasks_trace rcu grace period.
2484 *
2485 * When a non-sleepable program is inside the array, we take the rcu read
2486 * section and disable preemption for that program alone, so it can access
2487 * rcu-protected dynamically sized maps.
2488 */
2489static __always_inline u32
2490bpf_prog_run_array_uprobe(const struct bpf_prog_array *array,
2491 const void *ctx, bpf_prog_run_fn run_prog)
2492{
2493 const struct bpf_prog_array_item *item;
2494 const struct bpf_prog *prog;
2495 struct bpf_run_ctx *old_run_ctx;
2496 struct bpf_trace_run_ctx run_ctx;
2497 u32 ret = 1;
2498
2499 might_fault();
2500 RCU_LOCKDEP_WARN(!rcu_read_lock_trace_held(), "no rcu lock held");
2501
2502 if (unlikely(!array))
2503 return ret;
2504
2505 migrate_disable();
2506
2507 run_ctx.is_uprobe = true;
2508
2509 old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
2510 item = &array->items[0];
2511 while ((prog = READ_ONCE(item->prog))) {
2512 if (!prog->sleepable)
2513 rcu_read_lock();
2514
2515 run_ctx.bpf_cookie = item->bpf_cookie;
2516 ret &= run_prog(prog, ctx);
2517 item++;
2518
2519 if (!prog->sleepable)
2520 rcu_read_unlock();
2521 }
2522 bpf_reset_run_ctx(old_run_ctx);
2523 migrate_enable();
2524 return ret;
2525}
2526
2527bool bpf_jit_bypass_spec_v1(void);
2528bool bpf_jit_bypass_spec_v4(void);
2529
2530#define bpf_rcu_lock_held() \
2531 (rcu_read_lock_held() || rcu_read_lock_trace_held() || rcu_read_lock_bh_held())
2532
2533#ifdef CONFIG_BPF_SYSCALL
2534DECLARE_PER_CPU(int, bpf_prog_active);
2535extern struct mutex bpf_stats_enabled_mutex;
2536
2537/*
2538 * Block execution of BPF programs attached to instrumentation (perf,
2539 * kprobes, tracepoints) to prevent deadlocks on map operations as any of
2540 * these events can happen inside a region which holds a map bucket lock
2541 * and can deadlock on it.
2542 */
2543static inline void bpf_disable_instrumentation(void)
2544{
2545 migrate_disable();
2546 this_cpu_inc(bpf_prog_active);
2547}
2548
2549static inline void bpf_enable_instrumentation(void)
2550{
2551 this_cpu_dec(bpf_prog_active);
2552 migrate_enable();
2553}
2554
2555extern const struct super_operations bpf_super_ops;
2556extern const struct file_operations bpf_map_fops;
2557extern const struct file_operations bpf_prog_fops;
2558extern const struct file_operations bpf_iter_fops;
2559extern const struct file_operations bpf_token_fops;
2560
2561#define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \
2562 extern const struct bpf_prog_ops _name ## _prog_ops; \
2563 extern const struct bpf_verifier_ops _name ## _verifier_ops;
2564#define BPF_MAP_TYPE(_id, _ops) \
2565 extern const struct bpf_map_ops _ops;
2566#define BPF_LINK_TYPE(_id, _name)
2567#include <linux/bpf_types.h>
2568#undef BPF_PROG_TYPE
2569#undef BPF_MAP_TYPE
2570#undef BPF_LINK_TYPE
2571
2572extern const struct bpf_prog_ops bpf_offload_prog_ops;
2573extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops;
2574extern const struct bpf_verifier_ops xdp_analyzer_ops;
2575
2576struct bpf_prog *bpf_prog_get(u32 ufd);
2577struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type,
2578 bool attach_drv);
2579void bpf_prog_add(struct bpf_prog *prog, int i);
2580void bpf_prog_sub(struct bpf_prog *prog, int i);
2581void bpf_prog_inc(struct bpf_prog *prog);
2582struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog);
2583void bpf_prog_put(struct bpf_prog *prog);
2584
2585void bpf_prog_free_id(struct bpf_prog *prog);
2586void bpf_map_free_id(struct bpf_map *map);
2587
2588struct btf_field *btf_record_find(const struct btf_record *rec,
2589 u32 offset, u32 field_mask);
2590void btf_record_free(struct btf_record *rec);
2591void bpf_map_free_record(struct bpf_map *map);
2592struct btf_record *btf_record_dup(const struct btf_record *rec);
2593bool btf_record_equal(const struct btf_record *rec_a, const struct btf_record *rec_b);
2594void bpf_obj_free_timer(const struct btf_record *rec, void *obj);
2595void bpf_obj_free_workqueue(const struct btf_record *rec, void *obj);
2596void bpf_obj_free_task_work(const struct btf_record *rec, void *obj);
2597void bpf_obj_free_fields(const struct btf_record *rec, void *obj);
2598void __bpf_obj_drop_impl(void *p, const struct btf_record *rec, bool percpu);
2599
2600struct bpf_map *bpf_map_get(u32 ufd);
2601struct bpf_map *bpf_map_get_with_uref(u32 ufd);
2602
2603/*
2604 * The __bpf_map_get() and __btf_get_by_fd() functions parse a file
2605 * descriptor and return a corresponding map or btf object.
2606 * Their names are double underscored to emphasize the fact that they
2607 * do not increase refcnt. To also increase refcnt use corresponding
2608 * bpf_map_get() and btf_get_by_fd() functions.
2609 */
2610
2611static inline struct bpf_map *__bpf_map_get(struct fd f)
2612{
2613 if (fd_empty(f))
2614 return ERR_PTR(-EBADF);
2615 if (unlikely(fd_file(f)->f_op != &bpf_map_fops))
2616 return ERR_PTR(-EINVAL);
2617 return fd_file(f)->private_data;
2618}
2619
2620static inline struct btf *__btf_get_by_fd(struct fd f)
2621{
2622 if (fd_empty(f))
2623 return ERR_PTR(-EBADF);
2624 if (unlikely(fd_file(f)->f_op != &btf_fops))
2625 return ERR_PTR(-EINVAL);
2626 return fd_file(f)->private_data;
2627}
2628
2629void bpf_map_inc(struct bpf_map *map);
2630void bpf_map_inc_with_uref(struct bpf_map *map);
2631struct bpf_map *__bpf_map_inc_not_zero(struct bpf_map *map, bool uref);
2632struct bpf_map * __must_check bpf_map_inc_not_zero(struct bpf_map *map);
2633void bpf_map_put_with_uref(struct bpf_map *map);
2634void bpf_map_put(struct bpf_map *map);
2635void *bpf_map_area_alloc(u64 size, int numa_node);
2636void *bpf_map_area_mmapable_alloc(u64 size, int numa_node);
2637void bpf_map_area_free(void *base);
2638bool bpf_map_write_active(const struct bpf_map *map);
2639void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr);
2640int generic_map_lookup_batch(struct bpf_map *map,
2641 const union bpf_attr *attr,
2642 union bpf_attr __user *uattr);
2643int generic_map_update_batch(struct bpf_map *map, struct file *map_file,
2644 const union bpf_attr *attr,
2645 union bpf_attr __user *uattr);
2646int generic_map_delete_batch(struct bpf_map *map,
2647 const union bpf_attr *attr,
2648 union bpf_attr __user *uattr);
2649struct bpf_map *bpf_map_get_curr_or_next(u32 *id);
2650struct bpf_prog *bpf_prog_get_curr_or_next(u32 *id);
2651
2652
2653int bpf_map_alloc_pages(const struct bpf_map *map, int nid,
2654 unsigned long nr_pages, struct page **page_array);
2655#ifdef CONFIG_MEMCG
2656void bpf_map_memcg_enter(const struct bpf_map *map, struct mem_cgroup **old_memcg,
2657 struct mem_cgroup **new_memcg);
2658void bpf_map_memcg_exit(struct mem_cgroup *old_memcg,
2659 struct mem_cgroup *memcg);
2660void *bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags,
2661 int node);
2662void *bpf_map_kmalloc_nolock(const struct bpf_map *map, size_t size, gfp_t flags,
2663 int node);
2664void *bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags);
2665void *bpf_map_kvcalloc(struct bpf_map *map, size_t n, size_t size,
2666 gfp_t flags);
2667void __percpu *bpf_map_alloc_percpu(const struct bpf_map *map, size_t size,
2668 size_t align, gfp_t flags);
2669#else
2670/*
2671 * These specialized allocators have to be macros for their allocations to be
2672 * accounted separately (to have separate alloc_tag).
2673 */
2674#define bpf_map_kmalloc_node(_map, _size, _flags, _node) \
2675 kmalloc_node(_size, _flags, _node)
2676#define bpf_map_kmalloc_nolock(_map, _size, _flags, _node) \
2677 kmalloc_nolock(_size, _flags, _node)
2678#define bpf_map_kzalloc(_map, _size, _flags) \
2679 kzalloc(_size, _flags)
2680#define bpf_map_kvcalloc(_map, _n, _size, _flags) \
2681 kvcalloc(_n, _size, _flags)
2682#define bpf_map_alloc_percpu(_map, _size, _align, _flags) \
2683 __alloc_percpu_gfp(_size, _align, _flags)
2684static inline void bpf_map_memcg_enter(const struct bpf_map *map, struct mem_cgroup **old_memcg,
2685 struct mem_cgroup **new_memcg)
2686{
2687 *new_memcg = NULL;
2688 *old_memcg = NULL;
2689}
2690
2691static inline void bpf_map_memcg_exit(struct mem_cgroup *old_memcg,
2692 struct mem_cgroup *memcg)
2693{
2694}
2695#endif
2696
2697static inline int
2698bpf_map_init_elem_count(struct bpf_map *map)
2699{
2700 size_t size = sizeof(*map->elem_count), align = size;
2701 gfp_t flags = GFP_USER | __GFP_NOWARN;
2702
2703 map->elem_count = bpf_map_alloc_percpu(map, size, align, flags);
2704 if (!map->elem_count)
2705 return -ENOMEM;
2706
2707 return 0;
2708}
2709
2710static inline void
2711bpf_map_free_elem_count(struct bpf_map *map)
2712{
2713 free_percpu(map->elem_count);
2714}
2715
2716static inline void bpf_map_inc_elem_count(struct bpf_map *map)
2717{
2718 this_cpu_inc(*map->elem_count);
2719}
2720
2721static inline void bpf_map_dec_elem_count(struct bpf_map *map)
2722{
2723 this_cpu_dec(*map->elem_count);
2724}
2725
2726extern int sysctl_unprivileged_bpf_disabled;
2727
2728bool bpf_token_capable(const struct bpf_token *token, int cap);
2729
2730static inline bool bpf_allow_ptr_leaks(const struct bpf_token *token)
2731{
2732 return bpf_token_capable(token, CAP_PERFMON);
2733}
2734
2735static inline bool bpf_allow_uninit_stack(const struct bpf_token *token)
2736{
2737 return bpf_token_capable(token, CAP_PERFMON);
2738}
2739
2740static inline bool bpf_bypass_spec_v1(const struct bpf_token *token)
2741{
2742 return bpf_jit_bypass_spec_v1() ||
2743 cpu_mitigations_off() ||
2744 bpf_token_capable(token, CAP_PERFMON);
2745}
2746
2747static inline bool bpf_bypass_spec_v4(const struct bpf_token *token)
2748{
2749 return bpf_jit_bypass_spec_v4() ||
2750 cpu_mitigations_off() ||
2751 bpf_token_capable(token, CAP_PERFMON);
2752}
2753
2754int bpf_map_new_fd(struct bpf_map *map, int flags);
2755int bpf_prog_new_fd(struct bpf_prog *prog);
2756
2757void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
2758 const struct bpf_link_ops *ops, struct bpf_prog *prog,
2759 enum bpf_attach_type attach_type);
2760void bpf_link_init_sleepable(struct bpf_link *link, enum bpf_link_type type,
2761 const struct bpf_link_ops *ops, struct bpf_prog *prog,
2762 enum bpf_attach_type attach_type, bool sleepable);
2763int bpf_link_prime(struct bpf_link *link, struct bpf_link_primer *primer);
2764int bpf_link_settle(struct bpf_link_primer *primer);
2765void bpf_link_cleanup(struct bpf_link_primer *primer);
2766void bpf_link_inc(struct bpf_link *link);
2767struct bpf_link *bpf_link_inc_not_zero(struct bpf_link *link);
2768void bpf_link_put(struct bpf_link *link);
2769int bpf_link_new_fd(struct bpf_link *link);
2770struct bpf_link *bpf_link_get_from_fd(u32 ufd);
2771struct bpf_link *bpf_link_get_curr_or_next(u32 *id);
2772
2773void bpf_token_inc(struct bpf_token *token);
2774void bpf_token_put(struct bpf_token *token);
2775int bpf_token_create(union bpf_attr *attr);
2776struct bpf_token *bpf_token_get_from_fd(u32 ufd);
2777int bpf_token_get_info_by_fd(struct bpf_token *token,
2778 const union bpf_attr *attr,
2779 union bpf_attr __user *uattr);
2780
2781bool bpf_token_allow_cmd(const struct bpf_token *token, enum bpf_cmd cmd);
2782bool bpf_token_allow_map_type(const struct bpf_token *token, enum bpf_map_type type);
2783bool bpf_token_allow_prog_type(const struct bpf_token *token,
2784 enum bpf_prog_type prog_type,
2785 enum bpf_attach_type attach_type);
2786
2787int bpf_obj_pin_user(u32 ufd, int path_fd, const char __user *pathname);
2788int bpf_obj_get_user(int path_fd, const char __user *pathname, int flags);
2789struct inode *bpf_get_inode(struct super_block *sb, const struct inode *dir,
2790 umode_t mode);
2791
2792#define BPF_ITER_FUNC_PREFIX "bpf_iter_"
2793#define DEFINE_BPF_ITER_FUNC(target, args...) \
2794 extern int bpf_iter_ ## target(args); \
2795 int __init bpf_iter_ ## target(args) { return 0; }
2796
2797/*
2798 * The task type of iterators.
2799 *
2800 * For BPF task iterators, they can be parameterized with various
2801 * parameters to visit only some of tasks.
2802 *
2803 * BPF_TASK_ITER_ALL (default)
2804 * Iterate over resources of every task.
2805 *
2806 * BPF_TASK_ITER_TID
2807 * Iterate over resources of a task/tid.
2808 *
2809 * BPF_TASK_ITER_TGID
2810 * Iterate over resources of every task of a process / task group.
2811 */
2812enum bpf_iter_task_type {
2813 BPF_TASK_ITER_ALL = 0,
2814 BPF_TASK_ITER_TID,
2815 BPF_TASK_ITER_TGID,
2816};
2817
2818struct bpf_iter_aux_info {
2819 /* for map_elem iter */
2820 struct bpf_map *map;
2821
2822 /* for cgroup iter */
2823 struct {
2824 struct cgroup *start; /* starting cgroup */
2825 enum bpf_cgroup_iter_order order;
2826 } cgroup;
2827 struct {
2828 enum bpf_iter_task_type type;
2829 u32 pid;
2830 } task;
2831};
2832
2833typedef int (*bpf_iter_attach_target_t)(struct bpf_prog *prog,
2834 union bpf_iter_link_info *linfo,
2835 struct bpf_iter_aux_info *aux);
2836typedef void (*bpf_iter_detach_target_t)(struct bpf_iter_aux_info *aux);
2837typedef void (*bpf_iter_show_fdinfo_t) (const struct bpf_iter_aux_info *aux,
2838 struct seq_file *seq);
2839typedef int (*bpf_iter_fill_link_info_t)(const struct bpf_iter_aux_info *aux,
2840 struct bpf_link_info *info);
2841typedef const struct bpf_func_proto *
2842(*bpf_iter_get_func_proto_t)(enum bpf_func_id func_id,
2843 const struct bpf_prog *prog);
2844
2845enum bpf_iter_feature {
2846 BPF_ITER_RESCHED = BIT(0),
2847};
2848
2849#define BPF_ITER_CTX_ARG_MAX 2
2850struct bpf_iter_reg {
2851 const char *target;
2852 bpf_iter_attach_target_t attach_target;
2853 bpf_iter_detach_target_t detach_target;
2854 bpf_iter_show_fdinfo_t show_fdinfo;
2855 bpf_iter_fill_link_info_t fill_link_info;
2856 bpf_iter_get_func_proto_t get_func_proto;
2857 u32 ctx_arg_info_size;
2858 u32 feature;
2859 struct bpf_ctx_arg_aux ctx_arg_info[BPF_ITER_CTX_ARG_MAX];
2860 const struct bpf_iter_seq_info *seq_info;
2861};
2862
2863struct bpf_iter_meta {
2864 __bpf_md_ptr(struct seq_file *, seq);
2865 u64 session_id;
2866 u64 seq_num;
2867};
2868
2869struct bpf_iter__bpf_map_elem {
2870 __bpf_md_ptr(struct bpf_iter_meta *, meta);
2871 __bpf_md_ptr(struct bpf_map *, map);
2872 __bpf_md_ptr(void *, key);
2873 __bpf_md_ptr(void *, value);
2874};
2875
2876int bpf_iter_reg_target(const struct bpf_iter_reg *reg_info);
2877void bpf_iter_unreg_target(const struct bpf_iter_reg *reg_info);
2878int bpf_iter_prog_supported(struct bpf_prog *prog);
2879const struct bpf_func_proto *
2880bpf_iter_get_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog);
2881int bpf_iter_link_attach(const union bpf_attr *attr, bpfptr_t uattr, struct bpf_prog *prog);
2882int bpf_iter_new_fd(struct bpf_link *link);
2883bool bpf_link_is_iter(struct bpf_link *link);
2884struct bpf_prog *bpf_iter_get_info(struct bpf_iter_meta *meta, bool in_stop);
2885int bpf_iter_run_prog(struct bpf_prog *prog, void *ctx);
2886void bpf_iter_map_show_fdinfo(const struct bpf_iter_aux_info *aux,
2887 struct seq_file *seq);
2888int bpf_iter_map_fill_link_info(const struct bpf_iter_aux_info *aux,
2889 struct bpf_link_info *info);
2890
2891int map_set_for_each_callback_args(struct bpf_verifier_env *env,
2892 struct bpf_func_state *caller,
2893 struct bpf_func_state *callee);
2894
2895int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value, u64 flags);
2896int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value, u64 flags);
2897int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value,
2898 u64 flags);
2899int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value,
2900 u64 flags);
2901
2902int bpf_stackmap_extract(struct bpf_map *map, void *key, void *value, bool delete);
2903
2904int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file,
2905 void *key, void *value, u64 map_flags);
2906int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
2907int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file,
2908 void *key, void *value, u64 map_flags);
2909int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
2910
2911int bpf_get_file_flag(int flags);
2912int bpf_check_uarg_tail_zero(bpfptr_t uaddr, size_t expected_size,
2913 size_t actual_size);
2914
2915/* verify correctness of eBPF program */
2916int bpf_check(struct bpf_prog **fp, union bpf_attr *attr, bpfptr_t uattr, u32 uattr_size);
2917
2918#ifndef CONFIG_BPF_JIT_ALWAYS_ON
2919void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth);
2920#endif
2921
2922struct btf *bpf_get_btf_vmlinux(void);
2923
2924/* Map specifics */
2925struct xdp_frame;
2926struct sk_buff;
2927struct bpf_dtab_netdev;
2928struct bpf_cpu_map_entry;
2929
2930void __dev_flush(struct list_head *flush_list);
2931int dev_xdp_enqueue(struct net_device *dev, struct xdp_frame *xdpf,
2932 struct net_device *dev_rx);
2933int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_frame *xdpf,
2934 struct net_device *dev_rx);
2935int dev_map_enqueue_multi(struct xdp_frame *xdpf, struct net_device *dev_rx,
2936 struct bpf_map *map, bool exclude_ingress);
2937int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, struct sk_buff *skb,
2938 const struct bpf_prog *xdp_prog);
2939int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb,
2940 const struct bpf_prog *xdp_prog,
2941 struct bpf_map *map, bool exclude_ingress);
2942
2943void __cpu_map_flush(struct list_head *flush_list);
2944int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_frame *xdpf,
2945 struct net_device *dev_rx);
2946int cpu_map_generic_redirect(struct bpf_cpu_map_entry *rcpu,
2947 struct sk_buff *skb);
2948
2949/* Return map's numa specified by userspace */
2950static inline int bpf_map_attr_numa_node(const union bpf_attr *attr)
2951{
2952 return (attr->map_flags & BPF_F_NUMA_NODE) ?
2953 attr->numa_node : NUMA_NO_NODE;
2954}
2955
2956struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type);
2957int array_map_alloc_check(union bpf_attr *attr);
2958
2959int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
2960 union bpf_attr __user *uattr);
2961int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
2962 union bpf_attr __user *uattr);
2963int bpf_prog_test_run_tracing(struct bpf_prog *prog,
2964 const union bpf_attr *kattr,
2965 union bpf_attr __user *uattr);
2966int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
2967 const union bpf_attr *kattr,
2968 union bpf_attr __user *uattr);
2969int bpf_prog_test_run_raw_tp(struct bpf_prog *prog,
2970 const union bpf_attr *kattr,
2971 union bpf_attr __user *uattr);
2972int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog,
2973 const union bpf_attr *kattr,
2974 union bpf_attr __user *uattr);
2975int bpf_prog_test_run_nf(struct bpf_prog *prog,
2976 const union bpf_attr *kattr,
2977 union bpf_attr __user *uattr);
2978bool btf_ctx_access(int off, int size, enum bpf_access_type type,
2979 const struct bpf_prog *prog,
2980 struct bpf_insn_access_aux *info);
2981
2982static inline bool bpf_tracing_ctx_access(int off, int size,
2983 enum bpf_access_type type)
2984{
2985 if (off < 0 || off >= sizeof(__u64) * MAX_BPF_FUNC_ARGS)
2986 return false;
2987 if (type != BPF_READ)
2988 return false;
2989 if (off % size != 0)
2990 return false;
2991 return true;
2992}
2993
2994static inline bool bpf_tracing_btf_ctx_access(int off, int size,
2995 enum bpf_access_type type,
2996 const struct bpf_prog *prog,
2997 struct bpf_insn_access_aux *info)
2998{
2999 if (!bpf_tracing_ctx_access(off, size, type))
3000 return false;
3001 return btf_ctx_access(off, size, type, prog, info);
3002}
3003
3004int btf_struct_access(struct bpf_verifier_log *log,
3005 const struct bpf_reg_state *reg,
3006 int off, int size, enum bpf_access_type atype,
3007 u32 *next_btf_id, enum bpf_type_flag *flag, const char **field_name);
3008bool btf_struct_ids_match(struct bpf_verifier_log *log,
3009 const struct btf *btf, u32 id, int off,
3010 const struct btf *need_btf, u32 need_type_id,
3011 bool strict);
3012
3013int btf_distill_func_proto(struct bpf_verifier_log *log,
3014 struct btf *btf,
3015 const struct btf_type *func_proto,
3016 const char *func_name,
3017 struct btf_func_model *m);
3018
3019struct bpf_reg_state;
3020int btf_prepare_func_args(struct bpf_verifier_env *env, int subprog);
3021int btf_check_type_match(struct bpf_verifier_log *log, const struct bpf_prog *prog,
3022 struct btf *btf, const struct btf_type *t);
3023const char *btf_find_decl_tag_value(const struct btf *btf, const struct btf_type *pt,
3024 int comp_idx, const char *tag_key);
3025int btf_find_next_decl_tag(const struct btf *btf, const struct btf_type *pt,
3026 int comp_idx, const char *tag_key, int last_id);
3027
3028struct bpf_prog *bpf_prog_by_id(u32 id);
3029struct bpf_link *bpf_link_by_id(u32 id);
3030
3031const struct bpf_func_proto *bpf_base_func_proto(enum bpf_func_id func_id,
3032 const struct bpf_prog *prog);
3033void bpf_task_storage_free(struct task_struct *task);
3034void bpf_cgrp_storage_free(struct cgroup *cgroup);
3035bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog);
3036const struct btf_func_model *
3037bpf_jit_find_kfunc_model(const struct bpf_prog *prog,
3038 const struct bpf_insn *insn);
3039int bpf_get_kfunc_addr(const struct bpf_prog *prog, u32 func_id,
3040 u16 btf_fd_idx, u8 **func_addr);
3041
3042struct bpf_core_ctx {
3043 struct bpf_verifier_log *log;
3044 const struct btf *btf;
3045};
3046
3047bool btf_nested_type_is_trusted(struct bpf_verifier_log *log,
3048 const struct bpf_reg_state *reg,
3049 const char *field_name, u32 btf_id, const char *suffix);
3050
3051bool btf_type_ids_nocast_alias(struct bpf_verifier_log *log,
3052 const struct btf *reg_btf, u32 reg_id,
3053 const struct btf *arg_btf, u32 arg_id);
3054
3055int bpf_core_apply(struct bpf_core_ctx *ctx, const struct bpf_core_relo *relo,
3056 int relo_idx, void *insn);
3057
3058static inline bool unprivileged_ebpf_enabled(void)
3059{
3060 return !sysctl_unprivileged_bpf_disabled;
3061}
3062
3063/* Not all bpf prog type has the bpf_ctx.
3064 * For the bpf prog type that has initialized the bpf_ctx,
3065 * this function can be used to decide if a kernel function
3066 * is called by a bpf program.
3067 */
3068static inline bool has_current_bpf_ctx(void)
3069{
3070 return !!current->bpf_ctx;
3071}
3072
3073void notrace bpf_prog_inc_misses_counter(struct bpf_prog *prog);
3074
3075void bpf_dynptr_init(struct bpf_dynptr_kern *ptr, void *data,
3076 enum bpf_dynptr_type type, u32 offset, u32 size);
3077void bpf_dynptr_set_null(struct bpf_dynptr_kern *ptr);
3078void bpf_dynptr_set_rdonly(struct bpf_dynptr_kern *ptr);
3079void bpf_prog_report_arena_violation(bool write, unsigned long addr, unsigned long fault_ip);
3080
3081#else /* !CONFIG_BPF_SYSCALL */
3082static inline struct bpf_prog *bpf_prog_get(u32 ufd)
3083{
3084 return ERR_PTR(-EOPNOTSUPP);
3085}
3086
3087static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd,
3088 enum bpf_prog_type type,
3089 bool attach_drv)
3090{
3091 return ERR_PTR(-EOPNOTSUPP);
3092}
3093
3094static inline void bpf_prog_add(struct bpf_prog *prog, int i)
3095{
3096}
3097
3098static inline void bpf_prog_sub(struct bpf_prog *prog, int i)
3099{
3100}
3101
3102static inline void bpf_prog_put(struct bpf_prog *prog)
3103{
3104}
3105
3106static inline void bpf_prog_inc(struct bpf_prog *prog)
3107{
3108}
3109
3110static inline struct bpf_prog *__must_check
3111bpf_prog_inc_not_zero(struct bpf_prog *prog)
3112{
3113 return ERR_PTR(-EOPNOTSUPP);
3114}
3115
3116static inline void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
3117 const struct bpf_link_ops *ops,
3118 struct bpf_prog *prog, enum bpf_attach_type attach_type)
3119{
3120}
3121
3122static inline void bpf_link_init_sleepable(struct bpf_link *link, enum bpf_link_type type,
3123 const struct bpf_link_ops *ops, struct bpf_prog *prog,
3124 enum bpf_attach_type attach_type, bool sleepable)
3125{
3126}
3127
3128static inline int bpf_link_prime(struct bpf_link *link,
3129 struct bpf_link_primer *primer)
3130{
3131 return -EOPNOTSUPP;
3132}
3133
3134static inline int bpf_link_settle(struct bpf_link_primer *primer)
3135{
3136 return -EOPNOTSUPP;
3137}
3138
3139static inline void bpf_link_cleanup(struct bpf_link_primer *primer)
3140{
3141}
3142
3143static inline void bpf_link_inc(struct bpf_link *link)
3144{
3145}
3146
3147static inline struct bpf_link *bpf_link_inc_not_zero(struct bpf_link *link)
3148{
3149 return NULL;
3150}
3151
3152static inline void bpf_link_put(struct bpf_link *link)
3153{
3154}
3155
3156static inline int bpf_obj_get_user(const char __user *pathname, int flags)
3157{
3158 return -EOPNOTSUPP;
3159}
3160
3161static inline bool bpf_token_capable(const struct bpf_token *token, int cap)
3162{
3163 return capable(cap) || (cap != CAP_SYS_ADMIN && capable(CAP_SYS_ADMIN));
3164}
3165
3166static inline void bpf_token_inc(struct bpf_token *token)
3167{
3168}
3169
3170static inline void bpf_token_put(struct bpf_token *token)
3171{
3172}
3173
3174static inline struct bpf_token *bpf_token_get_from_fd(u32 ufd)
3175{
3176 return ERR_PTR(-EOPNOTSUPP);
3177}
3178
3179static inline int bpf_token_get_info_by_fd(struct bpf_token *token,
3180 const union bpf_attr *attr,
3181 union bpf_attr __user *uattr)
3182{
3183 return -EOPNOTSUPP;
3184}
3185
3186static inline void __dev_flush(struct list_head *flush_list)
3187{
3188}
3189
3190struct xdp_frame;
3191struct bpf_dtab_netdev;
3192struct bpf_cpu_map_entry;
3193
3194static inline
3195int dev_xdp_enqueue(struct net_device *dev, struct xdp_frame *xdpf,
3196 struct net_device *dev_rx)
3197{
3198 return 0;
3199}
3200
3201static inline
3202int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_frame *xdpf,
3203 struct net_device *dev_rx)
3204{
3205 return 0;
3206}
3207
3208static inline
3209int dev_map_enqueue_multi(struct xdp_frame *xdpf, struct net_device *dev_rx,
3210 struct bpf_map *map, bool exclude_ingress)
3211{
3212 return 0;
3213}
3214
3215struct sk_buff;
3216
3217static inline int dev_map_generic_redirect(struct bpf_dtab_netdev *dst,
3218 struct sk_buff *skb,
3219 const struct bpf_prog *xdp_prog)
3220{
3221 return 0;
3222}
3223
3224static inline
3225int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb,
3226 const struct bpf_prog *xdp_prog,
3227 struct bpf_map *map, bool exclude_ingress)
3228{
3229 return 0;
3230}
3231
3232static inline void __cpu_map_flush(struct list_head *flush_list)
3233{
3234}
3235
3236static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu,
3237 struct xdp_frame *xdpf,
3238 struct net_device *dev_rx)
3239{
3240 return 0;
3241}
3242
3243static inline int cpu_map_generic_redirect(struct bpf_cpu_map_entry *rcpu,
3244 struct sk_buff *skb)
3245{
3246 return -EOPNOTSUPP;
3247}
3248
3249static inline struct bpf_prog *bpf_prog_get_type_path(const char *name,
3250 enum bpf_prog_type type)
3251{
3252 return ERR_PTR(-EOPNOTSUPP);
3253}
3254
3255static inline int bpf_prog_test_run_xdp(struct bpf_prog *prog,
3256 const union bpf_attr *kattr,
3257 union bpf_attr __user *uattr)
3258{
3259 return -ENOTSUPP;
3260}
3261
3262static inline int bpf_prog_test_run_skb(struct bpf_prog *prog,
3263 const union bpf_attr *kattr,
3264 union bpf_attr __user *uattr)
3265{
3266 return -ENOTSUPP;
3267}
3268
3269static inline int bpf_prog_test_run_tracing(struct bpf_prog *prog,
3270 const union bpf_attr *kattr,
3271 union bpf_attr __user *uattr)
3272{
3273 return -ENOTSUPP;
3274}
3275
3276static inline int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
3277 const union bpf_attr *kattr,
3278 union bpf_attr __user *uattr)
3279{
3280 return -ENOTSUPP;
3281}
3282
3283static inline int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog,
3284 const union bpf_attr *kattr,
3285 union bpf_attr __user *uattr)
3286{
3287 return -ENOTSUPP;
3288}
3289
3290static inline void bpf_map_put(struct bpf_map *map)
3291{
3292}
3293
3294static inline struct bpf_prog *bpf_prog_by_id(u32 id)
3295{
3296 return ERR_PTR(-ENOTSUPP);
3297}
3298
3299static inline int btf_struct_access(struct bpf_verifier_log *log,
3300 const struct bpf_reg_state *reg,
3301 int off, int size, enum bpf_access_type atype,
3302 u32 *next_btf_id, enum bpf_type_flag *flag,
3303 const char **field_name)
3304{
3305 return -EACCES;
3306}
3307
3308static inline const struct bpf_func_proto *
3309bpf_base_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
3310{
3311 return NULL;
3312}
3313
3314static inline void bpf_task_storage_free(struct task_struct *task)
3315{
3316}
3317
3318static inline bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog)
3319{
3320 return false;
3321}
3322
3323static inline const struct btf_func_model *
3324bpf_jit_find_kfunc_model(const struct bpf_prog *prog,
3325 const struct bpf_insn *insn)
3326{
3327 return NULL;
3328}
3329
3330static inline int
3331bpf_get_kfunc_addr(const struct bpf_prog *prog, u32 func_id,
3332 u16 btf_fd_idx, u8 **func_addr)
3333{
3334 return -ENOTSUPP;
3335}
3336
3337static inline bool unprivileged_ebpf_enabled(void)
3338{
3339 return false;
3340}
3341
3342static inline bool has_current_bpf_ctx(void)
3343{
3344 return false;
3345}
3346
3347static inline void bpf_prog_inc_misses_counter(struct bpf_prog *prog)
3348{
3349}
3350
3351static inline void bpf_cgrp_storage_free(struct cgroup *cgroup)
3352{
3353}
3354
3355static inline void bpf_dynptr_init(struct bpf_dynptr_kern *ptr, void *data,
3356 enum bpf_dynptr_type type, u32 offset, u32 size)
3357{
3358}
3359
3360static inline void bpf_dynptr_set_null(struct bpf_dynptr_kern *ptr)
3361{
3362}
3363
3364static inline void bpf_dynptr_set_rdonly(struct bpf_dynptr_kern *ptr)
3365{
3366}
3367
3368static inline void bpf_prog_report_arena_violation(bool write, unsigned long addr,
3369 unsigned long fault_ip)
3370{
3371}
3372#endif /* CONFIG_BPF_SYSCALL */
3373
3374static inline bool bpf_net_capable(void)
3375{
3376 return capable(CAP_NET_ADMIN) || capable(CAP_SYS_ADMIN);
3377}
3378
3379static __always_inline int
3380bpf_probe_read_kernel_common(void *dst, u32 size, const void *unsafe_ptr)
3381{
3382 int ret = -EFAULT;
3383
3384 if (IS_ENABLED(CONFIG_BPF_EVENTS))
3385 ret = copy_from_kernel_nofault(dst, unsafe_ptr, size);
3386 if (unlikely(ret < 0))
3387 memset(dst, 0, size);
3388 return ret;
3389}
3390
3391void __bpf_free_used_btfs(struct btf_mod_pair *used_btfs, u32 len);
3392
3393static inline struct bpf_prog *bpf_prog_get_type(u32 ufd,
3394 enum bpf_prog_type type)
3395{
3396 return bpf_prog_get_type_dev(ufd, type, false);
3397}
3398
3399void __bpf_free_used_maps(struct bpf_prog_aux *aux,
3400 struct bpf_map **used_maps, u32 len);
3401
3402bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool);
3403
3404int bpf_prog_offload_compile(struct bpf_prog *prog);
3405void bpf_prog_dev_bound_destroy(struct bpf_prog *prog);
3406int bpf_prog_offload_info_fill(struct bpf_prog_info *info,
3407 struct bpf_prog *prog);
3408
3409int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map);
3410
3411int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value);
3412int bpf_map_offload_update_elem(struct bpf_map *map,
3413 void *key, void *value, u64 flags);
3414int bpf_map_offload_delete_elem(struct bpf_map *map, void *key);
3415int bpf_map_offload_get_next_key(struct bpf_map *map,
3416 void *key, void *next_key);
3417
3418bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map);
3419
3420struct bpf_offload_dev *
3421bpf_offload_dev_create(const struct bpf_prog_offload_ops *ops, void *priv);
3422void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev);
3423void *bpf_offload_dev_priv(struct bpf_offload_dev *offdev);
3424int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev,
3425 struct net_device *netdev);
3426void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev,
3427 struct net_device *netdev);
3428bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev);
3429
3430void unpriv_ebpf_notify(int new_state);
3431
3432#if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL)
3433int bpf_dev_bound_kfunc_check(struct bpf_verifier_log *log,
3434 struct bpf_prog_aux *prog_aux);
3435void *bpf_dev_bound_resolve_kfunc(struct bpf_prog *prog, u32 func_id);
3436int bpf_prog_dev_bound_init(struct bpf_prog *prog, union bpf_attr *attr);
3437int bpf_prog_dev_bound_inherit(struct bpf_prog *new_prog, struct bpf_prog *old_prog);
3438void bpf_dev_bound_netdev_unregister(struct net_device *dev);
3439
3440static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux)
3441{
3442 return aux->dev_bound;
3443}
3444
3445static inline bool bpf_prog_is_offloaded(const struct bpf_prog_aux *aux)
3446{
3447 return aux->offload_requested;
3448}
3449
3450bool bpf_prog_dev_bound_match(const struct bpf_prog *lhs, const struct bpf_prog *rhs);
3451
3452static inline bool bpf_map_is_offloaded(struct bpf_map *map)
3453{
3454 return unlikely(map->ops == &bpf_map_offload_ops);
3455}
3456
3457struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr);
3458void bpf_map_offload_map_free(struct bpf_map *map);
3459u64 bpf_map_offload_map_mem_usage(const struct bpf_map *map);
3460int bpf_prog_test_run_syscall(struct bpf_prog *prog,
3461 const union bpf_attr *kattr,
3462 union bpf_attr __user *uattr);
3463
3464int sock_map_get_from_fd(const union bpf_attr *attr, struct bpf_prog *prog);
3465int sock_map_prog_detach(const union bpf_attr *attr, enum bpf_prog_type ptype);
3466int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value, u64 flags);
3467int sock_map_bpf_prog_query(const union bpf_attr *attr,
3468 union bpf_attr __user *uattr);
3469int sock_map_link_create(const union bpf_attr *attr, struct bpf_prog *prog);
3470
3471void sock_map_unhash(struct sock *sk);
3472void sock_map_destroy(struct sock *sk);
3473void sock_map_close(struct sock *sk, long timeout);
3474#else
3475static inline int bpf_dev_bound_kfunc_check(struct bpf_verifier_log *log,
3476 struct bpf_prog_aux *prog_aux)
3477{
3478 return -EOPNOTSUPP;
3479}
3480
3481static inline void *bpf_dev_bound_resolve_kfunc(struct bpf_prog *prog,
3482 u32 func_id)
3483{
3484 return NULL;
3485}
3486
3487static inline int bpf_prog_dev_bound_init(struct bpf_prog *prog,
3488 union bpf_attr *attr)
3489{
3490 return -EOPNOTSUPP;
3491}
3492
3493static inline int bpf_prog_dev_bound_inherit(struct bpf_prog *new_prog,
3494 struct bpf_prog *old_prog)
3495{
3496 return -EOPNOTSUPP;
3497}
3498
3499static inline void bpf_dev_bound_netdev_unregister(struct net_device *dev)
3500{
3501}
3502
3503static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux)
3504{
3505 return false;
3506}
3507
3508static inline bool bpf_prog_is_offloaded(struct bpf_prog_aux *aux)
3509{
3510 return false;
3511}
3512
3513static inline bool bpf_prog_dev_bound_match(const struct bpf_prog *lhs, const struct bpf_prog *rhs)
3514{
3515 return false;
3516}
3517
3518static inline bool bpf_map_is_offloaded(struct bpf_map *map)
3519{
3520 return false;
3521}
3522
3523static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr)
3524{
3525 return ERR_PTR(-EOPNOTSUPP);
3526}
3527
3528static inline void bpf_map_offload_map_free(struct bpf_map *map)
3529{
3530}
3531
3532static inline u64 bpf_map_offload_map_mem_usage(const struct bpf_map *map)
3533{
3534 return 0;
3535}
3536
3537static inline int bpf_prog_test_run_syscall(struct bpf_prog *prog,
3538 const union bpf_attr *kattr,
3539 union bpf_attr __user *uattr)
3540{
3541 return -ENOTSUPP;
3542}
3543
3544#ifdef CONFIG_BPF_SYSCALL
3545static inline int sock_map_get_from_fd(const union bpf_attr *attr,
3546 struct bpf_prog *prog)
3547{
3548 return -EINVAL;
3549}
3550
3551static inline int sock_map_prog_detach(const union bpf_attr *attr,
3552 enum bpf_prog_type ptype)
3553{
3554 return -EOPNOTSUPP;
3555}
3556
3557static inline int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value,
3558 u64 flags)
3559{
3560 return -EOPNOTSUPP;
3561}
3562
3563static inline int sock_map_bpf_prog_query(const union bpf_attr *attr,
3564 union bpf_attr __user *uattr)
3565{
3566 return -EINVAL;
3567}
3568
3569static inline int sock_map_link_create(const union bpf_attr *attr, struct bpf_prog *prog)
3570{
3571 return -EOPNOTSUPP;
3572}
3573#endif /* CONFIG_BPF_SYSCALL */
3574#endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */
3575
3576static __always_inline void
3577bpf_prog_inc_misses_counters(const struct bpf_prog_array *array)
3578{
3579 const struct bpf_prog_array_item *item;
3580 struct bpf_prog *prog;
3581
3582 if (unlikely(!array))
3583 return;
3584
3585 item = &array->items[0];
3586 while ((prog = READ_ONCE(item->prog))) {
3587 bpf_prog_inc_misses_counter(prog);
3588 item++;
3589 }
3590}
3591
3592#if defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL)
3593void bpf_sk_reuseport_detach(struct sock *sk);
3594int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, void *key,
3595 void *value);
3596int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, void *key,
3597 void *value, u64 map_flags);
3598#else
3599static inline void bpf_sk_reuseport_detach(struct sock *sk)
3600{
3601}
3602
3603#ifdef CONFIG_BPF_SYSCALL
3604static inline int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map,
3605 void *key, void *value)
3606{
3607 return -EOPNOTSUPP;
3608}
3609
3610static inline int bpf_fd_reuseport_array_update_elem(struct bpf_map *map,
3611 void *key, void *value,
3612 u64 map_flags)
3613{
3614 return -EOPNOTSUPP;
3615}
3616#endif /* CONFIG_BPF_SYSCALL */
3617#endif /* defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) */
3618
3619#if defined(CONFIG_KEYS) && defined(CONFIG_BPF_SYSCALL)
3620
3621struct bpf_key *bpf_lookup_user_key(s32 serial, u64 flags);
3622struct bpf_key *bpf_lookup_system_key(u64 id);
3623void bpf_key_put(struct bpf_key *bkey);
3624int bpf_verify_pkcs7_signature(struct bpf_dynptr *data_p,
3625 struct bpf_dynptr *sig_p,
3626 struct bpf_key *trusted_keyring);
3627
3628#else
3629static inline struct bpf_key *bpf_lookup_user_key(u32 serial, u64 flags)
3630{
3631 return NULL;
3632}
3633
3634static inline struct bpf_key *bpf_lookup_system_key(u64 id)
3635{
3636 return NULL;
3637}
3638
3639static inline void bpf_key_put(struct bpf_key *bkey)
3640{
3641}
3642
3643static inline int bpf_verify_pkcs7_signature(struct bpf_dynptr *data_p,
3644 struct bpf_dynptr *sig_p,
3645 struct bpf_key *trusted_keyring)
3646{
3647 return -EOPNOTSUPP;
3648}
3649#endif /* defined(CONFIG_KEYS) && defined(CONFIG_BPF_SYSCALL) */
3650
3651/* verifier prototypes for helper functions called from eBPF programs */
3652extern const struct bpf_func_proto bpf_map_lookup_elem_proto;
3653extern const struct bpf_func_proto bpf_map_update_elem_proto;
3654extern const struct bpf_func_proto bpf_map_delete_elem_proto;
3655extern const struct bpf_func_proto bpf_map_push_elem_proto;
3656extern const struct bpf_func_proto bpf_map_pop_elem_proto;
3657extern const struct bpf_func_proto bpf_map_peek_elem_proto;
3658extern const struct bpf_func_proto bpf_map_lookup_percpu_elem_proto;
3659
3660extern const struct bpf_func_proto bpf_get_prandom_u32_proto;
3661extern const struct bpf_func_proto bpf_get_smp_processor_id_proto;
3662extern const struct bpf_func_proto bpf_get_numa_node_id_proto;
3663extern const struct bpf_func_proto bpf_tail_call_proto;
3664extern const struct bpf_func_proto bpf_ktime_get_ns_proto;
3665extern const struct bpf_func_proto bpf_ktime_get_boot_ns_proto;
3666extern const struct bpf_func_proto bpf_ktime_get_tai_ns_proto;
3667extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto;
3668extern const struct bpf_func_proto bpf_get_current_uid_gid_proto;
3669extern const struct bpf_func_proto bpf_get_current_comm_proto;
3670extern const struct bpf_func_proto bpf_get_stackid_proto;
3671extern const struct bpf_func_proto bpf_get_stack_proto;
3672extern const struct bpf_func_proto bpf_get_stack_sleepable_proto;
3673extern const struct bpf_func_proto bpf_get_task_stack_proto;
3674extern const struct bpf_func_proto bpf_get_task_stack_sleepable_proto;
3675extern const struct bpf_func_proto bpf_get_stackid_proto_pe;
3676extern const struct bpf_func_proto bpf_get_stack_proto_pe;
3677extern const struct bpf_func_proto bpf_sock_map_update_proto;
3678extern const struct bpf_func_proto bpf_sock_hash_update_proto;
3679extern const struct bpf_func_proto bpf_get_current_cgroup_id_proto;
3680extern const struct bpf_func_proto bpf_get_current_ancestor_cgroup_id_proto;
3681extern const struct bpf_func_proto bpf_get_cgroup_classid_curr_proto;
3682extern const struct bpf_func_proto bpf_current_task_under_cgroup_proto;
3683extern const struct bpf_func_proto bpf_msg_redirect_hash_proto;
3684extern const struct bpf_func_proto bpf_msg_redirect_map_proto;
3685extern const struct bpf_func_proto bpf_sk_redirect_hash_proto;
3686extern const struct bpf_func_proto bpf_sk_redirect_map_proto;
3687extern const struct bpf_func_proto bpf_spin_lock_proto;
3688extern const struct bpf_func_proto bpf_spin_unlock_proto;
3689extern const struct bpf_func_proto bpf_get_local_storage_proto;
3690extern const struct bpf_func_proto bpf_strtol_proto;
3691extern const struct bpf_func_proto bpf_strtoul_proto;
3692extern const struct bpf_func_proto bpf_tcp_sock_proto;
3693extern const struct bpf_func_proto bpf_jiffies64_proto;
3694extern const struct bpf_func_proto bpf_get_ns_current_pid_tgid_proto;
3695extern const struct bpf_func_proto bpf_event_output_data_proto;
3696extern const struct bpf_func_proto bpf_ringbuf_output_proto;
3697extern const struct bpf_func_proto bpf_ringbuf_reserve_proto;
3698extern const struct bpf_func_proto bpf_ringbuf_submit_proto;
3699extern const struct bpf_func_proto bpf_ringbuf_discard_proto;
3700extern const struct bpf_func_proto bpf_ringbuf_query_proto;
3701extern const struct bpf_func_proto bpf_ringbuf_reserve_dynptr_proto;
3702extern const struct bpf_func_proto bpf_ringbuf_submit_dynptr_proto;
3703extern const struct bpf_func_proto bpf_ringbuf_discard_dynptr_proto;
3704extern const struct bpf_func_proto bpf_skc_to_tcp6_sock_proto;
3705extern const struct bpf_func_proto bpf_skc_to_tcp_sock_proto;
3706extern const struct bpf_func_proto bpf_skc_to_tcp_timewait_sock_proto;
3707extern const struct bpf_func_proto bpf_skc_to_tcp_request_sock_proto;
3708extern const struct bpf_func_proto bpf_skc_to_udp6_sock_proto;
3709extern const struct bpf_func_proto bpf_skc_to_unix_sock_proto;
3710extern const struct bpf_func_proto bpf_skc_to_mptcp_sock_proto;
3711extern const struct bpf_func_proto bpf_copy_from_user_proto;
3712extern const struct bpf_func_proto bpf_snprintf_btf_proto;
3713extern const struct bpf_func_proto bpf_snprintf_proto;
3714extern const struct bpf_func_proto bpf_per_cpu_ptr_proto;
3715extern const struct bpf_func_proto bpf_this_cpu_ptr_proto;
3716extern const struct bpf_func_proto bpf_ktime_get_coarse_ns_proto;
3717extern const struct bpf_func_proto bpf_sock_from_file_proto;
3718extern const struct bpf_func_proto bpf_get_socket_ptr_cookie_proto;
3719extern const struct bpf_func_proto bpf_task_storage_get_recur_proto;
3720extern const struct bpf_func_proto bpf_task_storage_get_proto;
3721extern const struct bpf_func_proto bpf_task_storage_delete_recur_proto;
3722extern const struct bpf_func_proto bpf_task_storage_delete_proto;
3723extern const struct bpf_func_proto bpf_for_each_map_elem_proto;
3724extern const struct bpf_func_proto bpf_btf_find_by_name_kind_proto;
3725extern const struct bpf_func_proto bpf_sk_setsockopt_proto;
3726extern const struct bpf_func_proto bpf_sk_getsockopt_proto;
3727extern const struct bpf_func_proto bpf_unlocked_sk_setsockopt_proto;
3728extern const struct bpf_func_proto bpf_unlocked_sk_getsockopt_proto;
3729extern const struct bpf_func_proto bpf_find_vma_proto;
3730extern const struct bpf_func_proto bpf_loop_proto;
3731extern const struct bpf_func_proto bpf_copy_from_user_task_proto;
3732extern const struct bpf_func_proto bpf_set_retval_proto;
3733extern const struct bpf_func_proto bpf_get_retval_proto;
3734extern const struct bpf_func_proto bpf_user_ringbuf_drain_proto;
3735extern const struct bpf_func_proto bpf_cgrp_storage_get_proto;
3736extern const struct bpf_func_proto bpf_cgrp_storage_delete_proto;
3737
3738const struct bpf_func_proto *tracing_prog_func_proto(
3739 enum bpf_func_id func_id, const struct bpf_prog *prog);
3740
3741/* Shared helpers among cBPF and eBPF. */
3742void bpf_user_rnd_init_once(void);
3743u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
3744u64 bpf_get_raw_cpu_id(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
3745
3746#if defined(CONFIG_NET)
3747bool bpf_sock_common_is_valid_access(int off, int size,
3748 enum bpf_access_type type,
3749 struct bpf_insn_access_aux *info);
3750bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type,
3751 struct bpf_insn_access_aux *info);
3752u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
3753 const struct bpf_insn *si,
3754 struct bpf_insn *insn_buf,
3755 struct bpf_prog *prog,
3756 u32 *target_size);
3757int bpf_dynptr_from_skb_rdonly(struct __sk_buff *skb, u64 flags,
3758 struct bpf_dynptr *ptr);
3759#else
3760static inline bool bpf_sock_common_is_valid_access(int off, int size,
3761 enum bpf_access_type type,
3762 struct bpf_insn_access_aux *info)
3763{
3764 return false;
3765}
3766static inline bool bpf_sock_is_valid_access(int off, int size,
3767 enum bpf_access_type type,
3768 struct bpf_insn_access_aux *info)
3769{
3770 return false;
3771}
3772static inline u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
3773 const struct bpf_insn *si,
3774 struct bpf_insn *insn_buf,
3775 struct bpf_prog *prog,
3776 u32 *target_size)
3777{
3778 return 0;
3779}
3780static inline int bpf_dynptr_from_skb_rdonly(struct __sk_buff *skb, u64 flags,
3781 struct bpf_dynptr *ptr)
3782{
3783 return -EOPNOTSUPP;
3784}
3785#endif
3786
3787#ifdef CONFIG_INET
3788struct sk_reuseport_kern {
3789 struct sk_buff *skb;
3790 struct sock *sk;
3791 struct sock *selected_sk;
3792 struct sock *migrating_sk;
3793 void *data_end;
3794 u32 hash;
3795 u32 reuseport_id;
3796 bool bind_inany;
3797};
3798bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
3799 struct bpf_insn_access_aux *info);
3800
3801u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
3802 const struct bpf_insn *si,
3803 struct bpf_insn *insn_buf,
3804 struct bpf_prog *prog,
3805 u32 *target_size);
3806
3807bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
3808 struct bpf_insn_access_aux *info);
3809
3810u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
3811 const struct bpf_insn *si,
3812 struct bpf_insn *insn_buf,
3813 struct bpf_prog *prog,
3814 u32 *target_size);
3815#else
3816static inline bool bpf_tcp_sock_is_valid_access(int off, int size,
3817 enum bpf_access_type type,
3818 struct bpf_insn_access_aux *info)
3819{
3820 return false;
3821}
3822
3823static inline u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
3824 const struct bpf_insn *si,
3825 struct bpf_insn *insn_buf,
3826 struct bpf_prog *prog,
3827 u32 *target_size)
3828{
3829 return 0;
3830}
3831static inline bool bpf_xdp_sock_is_valid_access(int off, int size,
3832 enum bpf_access_type type,
3833 struct bpf_insn_access_aux *info)
3834{
3835 return false;
3836}
3837
3838static inline u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
3839 const struct bpf_insn *si,
3840 struct bpf_insn *insn_buf,
3841 struct bpf_prog *prog,
3842 u32 *target_size)
3843{
3844 return 0;
3845}
3846#endif /* CONFIG_INET */
3847
3848enum bpf_text_poke_type {
3849 BPF_MOD_NOP,
3850 BPF_MOD_CALL,
3851 BPF_MOD_JUMP,
3852};
3853
3854int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type old_t,
3855 enum bpf_text_poke_type new_t, void *old_addr,
3856 void *new_addr);
3857
3858void bpf_arch_poke_desc_update(struct bpf_jit_poke_descriptor *poke,
3859 struct bpf_prog *new, struct bpf_prog *old);
3860
3861void *bpf_arch_text_copy(void *dst, void *src, size_t len);
3862int bpf_arch_text_invalidate(void *dst, size_t len);
3863
3864struct btf_id_set;
3865bool btf_id_set_contains(const struct btf_id_set *set, u32 id);
3866
3867#define MAX_BPRINTF_VARARGS 12
3868#define MAX_BPRINTF_BUF 1024
3869
3870/* Per-cpu temp buffers used by printf-like helpers to store the bprintf binary
3871 * arguments representation.
3872 */
3873#define MAX_BPRINTF_BIN_ARGS 512
3874
3875struct bpf_bprintf_buffers {
3876 char bin_args[MAX_BPRINTF_BIN_ARGS];
3877 char buf[MAX_BPRINTF_BUF];
3878};
3879
3880struct bpf_bprintf_data {
3881 u32 *bin_args;
3882 char *buf;
3883 bool get_bin_args;
3884 bool get_buf;
3885};
3886
3887int bpf_bprintf_prepare(const char *fmt, u32 fmt_size, const u64 *raw_args,
3888 u32 num_args, struct bpf_bprintf_data *data);
3889void bpf_bprintf_cleanup(struct bpf_bprintf_data *data);
3890int bpf_try_get_buffers(struct bpf_bprintf_buffers **bufs);
3891void bpf_put_buffers(void);
3892
3893void bpf_prog_stream_init(struct bpf_prog *prog);
3894void bpf_prog_stream_free(struct bpf_prog *prog);
3895int bpf_prog_stream_read(struct bpf_prog *prog, enum bpf_stream_id stream_id, void __user *buf, int len);
3896void bpf_stream_stage_init(struct bpf_stream_stage *ss);
3897void bpf_stream_stage_free(struct bpf_stream_stage *ss);
3898__printf(2, 3)
3899int bpf_stream_stage_printk(struct bpf_stream_stage *ss, const char *fmt, ...);
3900int bpf_stream_stage_commit(struct bpf_stream_stage *ss, struct bpf_prog *prog,
3901 enum bpf_stream_id stream_id);
3902int bpf_stream_stage_dump_stack(struct bpf_stream_stage *ss);
3903
3904#define bpf_stream_printk(ss, ...) bpf_stream_stage_printk(&ss, __VA_ARGS__)
3905#define bpf_stream_dump_stack(ss) bpf_stream_stage_dump_stack(&ss)
3906
3907#define bpf_stream_stage(ss, prog, stream_id, expr) \
3908 ({ \
3909 bpf_stream_stage_init(&ss); \
3910 (expr); \
3911 bpf_stream_stage_commit(&ss, prog, stream_id); \
3912 bpf_stream_stage_free(&ss); \
3913 })
3914
3915#ifdef CONFIG_BPF_LSM
3916void bpf_cgroup_atype_get(u32 attach_btf_id, int cgroup_atype);
3917void bpf_cgroup_atype_put(int cgroup_atype);
3918#else
3919static inline void bpf_cgroup_atype_get(u32 attach_btf_id, int cgroup_atype) {}
3920static inline void bpf_cgroup_atype_put(int cgroup_atype) {}
3921#endif /* CONFIG_BPF_LSM */
3922
3923struct key;
3924
3925#ifdef CONFIG_KEYS
3926struct bpf_key {
3927 struct key *key;
3928 bool has_ref;
3929};
3930#endif /* CONFIG_KEYS */
3931
3932static inline bool type_is_alloc(u32 type)
3933{
3934 return type & MEM_ALLOC;
3935}
3936
3937static inline gfp_t bpf_memcg_flags(gfp_t flags)
3938{
3939 if (memcg_bpf_enabled())
3940 return flags | __GFP_ACCOUNT;
3941 return flags;
3942}
3943
3944static inline bool bpf_is_subprog(const struct bpf_prog *prog)
3945{
3946 return prog->aux->func_idx != 0;
3947}
3948
3949int bpf_prog_get_file_line(struct bpf_prog *prog, unsigned long ip, const char **filep,
3950 const char **linep, int *nump);
3951struct bpf_prog *bpf_prog_find_from_stack(void);
3952
3953int bpf_insn_array_init(struct bpf_map *map, const struct bpf_prog *prog);
3954int bpf_insn_array_ready(struct bpf_map *map);
3955void bpf_insn_array_release(struct bpf_map *map);
3956void bpf_insn_array_adjust(struct bpf_map *map, u32 off, u32 len);
3957void bpf_insn_array_adjust_after_remove(struct bpf_map *map, u32 off, u32 len);
3958
3959#ifdef CONFIG_BPF_SYSCALL
3960void bpf_prog_update_insn_ptrs(struct bpf_prog *prog, u32 *offsets, void *image);
3961#else
3962static inline void
3963bpf_prog_update_insn_ptrs(struct bpf_prog *prog, u32 *offsets, void *image)
3964{
3965}
3966#endif
3967
3968static inline bool bpf_map_supports_cpu_flags(enum bpf_map_type map_type)
3969{
3970 switch (map_type) {
3971 case BPF_MAP_TYPE_PERCPU_ARRAY:
3972 case BPF_MAP_TYPE_PERCPU_HASH:
3973 case BPF_MAP_TYPE_LRU_PERCPU_HASH:
3974 case BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE:
3975 return true;
3976 default:
3977 return false;
3978 }
3979}
3980
3981static inline int bpf_map_check_op_flags(struct bpf_map *map, u64 flags, u64 allowed_flags)
3982{
3983 u32 cpu;
3984
3985 if ((u32)flags & ~allowed_flags)
3986 return -EINVAL;
3987
3988 if ((flags & BPF_F_LOCK) && !btf_record_has_field(map->record, BPF_SPIN_LOCK))
3989 return -EINVAL;
3990
3991 if (!(flags & BPF_F_CPU) && flags >> 32)
3992 return -EINVAL;
3993
3994 if (flags & (BPF_F_CPU | BPF_F_ALL_CPUS)) {
3995 if (!bpf_map_supports_cpu_flags(map->map_type))
3996 return -EINVAL;
3997 if ((flags & BPF_F_CPU) && (flags & BPF_F_ALL_CPUS))
3998 return -EINVAL;
3999
4000 cpu = flags >> 32;
4001 if ((flags & BPF_F_CPU) && cpu >= num_possible_cpus())
4002 return -ERANGE;
4003 }
4004
4005 return 0;
4006}
4007
4008#endif /* _LINUX_BPF_H */