Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/* SPDX-License-Identifier: GPL-2.0 */
2/* Copyright (c) 2018 Facebook */
3
4#ifndef _LINUX_BTF_H
5#define _LINUX_BTF_H 1
6
7#include <linux/types.h>
8#include <linux/bpfptr.h>
9#include <linux/bsearch.h>
10#include <linux/btf_ids.h>
11#include <uapi/linux/btf.h>
12#include <uapi/linux/bpf.h>
13
14#define BTF_TYPE_EMIT(type) ((void)(type *)0)
15#define BTF_TYPE_EMIT_ENUM(enum_val) ((void)enum_val)
16
17/* These need to be macros, as the expressions are used in assembler input */
18#define KF_ACQUIRE (1 << 0) /* kfunc is an acquire function */
19#define KF_RELEASE (1 << 1) /* kfunc is a release function */
20#define KF_RET_NULL (1 << 2) /* kfunc returns a pointer that may be NULL */
21/* Trusted arguments are those which are guaranteed to be valid when passed to
22 * the kfunc. It is used to enforce that pointers obtained from either acquire
23 * kfuncs, or from the main kernel on a tracepoint or struct_ops callback
24 * invocation, remain unmodified when being passed to helpers taking trusted
25 * args.
26 *
27 * Consider, for example, the following new task tracepoint:
28 *
29 * SEC("tp_btf/task_newtask")
30 * int BPF_PROG(new_task_tp, struct task_struct *task, u64 clone_flags)
31 * {
32 * ...
33 * }
34 *
35 * And the following kfunc:
36 *
37 * BTF_ID_FLAGS(func, bpf_task_acquire, KF_ACQUIRE)
38 *
39 * All invocations to the kfunc must pass the unmodified, unwalked task:
40 *
41 * bpf_task_acquire(task); // Allowed
42 * bpf_task_acquire(task->last_wakee); // Rejected, walked task
43 *
44 * Programs may also pass referenced tasks directly to the kfunc:
45 *
46 * struct task_struct *acquired;
47 *
48 * acquired = bpf_task_acquire(task); // Allowed, same as above
49 * bpf_task_acquire(acquired); // Allowed
50 * bpf_task_acquire(task); // Allowed
51 * bpf_task_acquire(acquired->last_wakee); // Rejected, walked task
52 *
53 * Programs may _not_, however, pass a task from an arbitrary fentry/fexit, or
54 * kprobe/kretprobe to the kfunc, as BPF cannot guarantee that all of these
55 * pointers are guaranteed to be safe. For example, the following BPF program
56 * would be rejected:
57 *
58 * SEC("kretprobe/free_task")
59 * int BPF_PROG(free_task_probe, struct task_struct *tsk)
60 * {
61 * struct task_struct *acquired;
62 *
63 * acquired = bpf_task_acquire(acquired); // Rejected, not a trusted pointer
64 * bpf_task_release(acquired);
65 *
66 * return 0;
67 * }
68 */
69#define KF_SLEEPABLE (1 << 5) /* kfunc may sleep */
70#define KF_DESTRUCTIVE (1 << 6) /* kfunc performs destructive actions */
71#define KF_RCU (1 << 7) /* kfunc takes either rcu or trusted pointer arguments */
72/* only one of KF_ITER_{NEW,NEXT,DESTROY} could be specified per kfunc */
73#define KF_ITER_NEW (1 << 8) /* kfunc implements BPF iter constructor */
74#define KF_ITER_NEXT (1 << 9) /* kfunc implements BPF iter next method */
75#define KF_ITER_DESTROY (1 << 10) /* kfunc implements BPF iter destructor */
76#define KF_RCU_PROTECTED (1 << 11) /* kfunc should be protected by rcu cs when they are invoked */
77#define KF_FASTCALL (1 << 12) /* kfunc supports bpf_fastcall protocol */
78#define KF_ARENA_RET (1 << 13) /* kfunc returns an arena pointer */
79#define KF_ARENA_ARG1 (1 << 14) /* kfunc takes an arena pointer as its first argument */
80#define KF_ARENA_ARG2 (1 << 15) /* kfunc takes an arena pointer as its second argument */
81#define KF_IMPLICIT_ARGS (1 << 16) /* kfunc has implicit arguments supplied by the verifier */
82
83/*
84 * Tag marking a kernel function as a kfunc. This is meant to minimize the
85 * amount of copy-paste that kfunc authors have to include for correctness so
86 * as to avoid issues such as the compiler inlining or eliding either a static
87 * kfunc, or a global kfunc in an LTO build.
88 */
89#define __bpf_kfunc __used __retain __noclone noinline
90
91#define __bpf_kfunc_start_defs() \
92 __diag_push(); \
93 __diag_ignore_all("-Wmissing-declarations", \
94 "Global kfuncs as their definitions will be in BTF");\
95 __diag_ignore_all("-Wmissing-prototypes", \
96 "Global kfuncs as their definitions will be in BTF")
97
98#define __bpf_kfunc_end_defs() __diag_pop()
99#define __bpf_hook_start() __bpf_kfunc_start_defs()
100#define __bpf_hook_end() __bpf_kfunc_end_defs()
101
102/*
103 * Return the name of the passed struct, if exists, or halt the build if for
104 * example the structure gets renamed. In this way, developers have to revisit
105 * the code using that structure name, and update it accordingly.
106 */
107#define stringify_struct(x) \
108 ({ BUILD_BUG_ON(sizeof(struct x) < 0); \
109 __stringify(x); })
110
111struct btf;
112struct btf_member;
113struct btf_type;
114union bpf_attr;
115struct btf_show;
116struct btf_id_set;
117struct bpf_prog;
118
119typedef int (*btf_kfunc_filter_t)(const struct bpf_prog *prog, u32 kfunc_id);
120
121struct btf_kfunc_id_set {
122 struct module *owner;
123 struct btf_id_set8 *set;
124 btf_kfunc_filter_t filter;
125};
126
127struct btf_id_dtor_kfunc {
128 u32 btf_id;
129 u32 kfunc_btf_id;
130};
131
132struct btf_struct_meta {
133 u32 btf_id;
134 struct btf_record *record;
135};
136
137struct btf_struct_metas {
138 u32 cnt;
139 struct btf_struct_meta types[];
140};
141
142extern const struct file_operations btf_fops;
143
144const char *btf_get_name(const struct btf *btf);
145void btf_get(struct btf *btf);
146void btf_put(struct btf *btf);
147const struct btf_header *btf_header(const struct btf *btf);
148int btf_new_fd(const union bpf_attr *attr, bpfptr_t uattr, u32 uattr_sz);
149struct btf *btf_get_by_fd(int fd);
150int btf_get_info_by_fd(const struct btf *btf,
151 const union bpf_attr *attr,
152 union bpf_attr __user *uattr);
153/* Figure out the size of a type_id. If type_id is a modifier
154 * (e.g. const), it will be resolved to find out the type with size.
155 *
156 * For example:
157 * In describing "const void *", type_id is "const" and "const"
158 * refers to "void *". The return type will be "void *".
159 *
160 * If type_id is a simple "int", then return type will be "int".
161 *
162 * @btf: struct btf object
163 * @type_id: Find out the size of type_id. The type_id of the return
164 * type is set to *type_id.
165 * @ret_size: It can be NULL. If not NULL, the size of the return
166 * type is set to *ret_size.
167 * Return: The btf_type (resolved to another type with size info if needed).
168 * NULL is returned if type_id itself does not have size info
169 * (e.g. void) or it cannot be resolved to another type that
170 * has size info.
171 * *type_id and *ret_size will not be changed in the
172 * NULL return case.
173 */
174const struct btf_type *btf_type_id_size(const struct btf *btf,
175 u32 *type_id,
176 u32 *ret_size);
177
178/*
179 * Options to control show behaviour.
180 * - BTF_SHOW_COMPACT: no formatting around type information
181 * - BTF_SHOW_NONAME: no struct/union member names/types
182 * - BTF_SHOW_PTR_RAW: show raw (unobfuscated) pointer values;
183 * equivalent to %px.
184 * - BTF_SHOW_ZERO: show zero-valued struct/union members; they
185 * are not displayed by default
186 * - BTF_SHOW_UNSAFE: skip use of bpf_probe_read() to safely read
187 * data before displaying it.
188 */
189#define BTF_SHOW_COMPACT BTF_F_COMPACT
190#define BTF_SHOW_NONAME BTF_F_NONAME
191#define BTF_SHOW_PTR_RAW BTF_F_PTR_RAW
192#define BTF_SHOW_ZERO BTF_F_ZERO
193#define BTF_SHOW_UNSAFE (1ULL << 4)
194
195void btf_type_seq_show(const struct btf *btf, u32 type_id, void *obj,
196 struct seq_file *m);
197int btf_type_seq_show_flags(const struct btf *btf, u32 type_id, void *obj,
198 struct seq_file *m, u64 flags);
199
200/*
201 * Copy len bytes of string representation of obj of BTF type_id into buf.
202 *
203 * @btf: struct btf object
204 * @type_id: type id of type obj points to
205 * @obj: pointer to typed data
206 * @buf: buffer to write to
207 * @len: maximum length to write to buf
208 * @flags: show options (see above)
209 *
210 * Return: length that would have been/was copied as per snprintf, or
211 * negative error.
212 */
213int btf_type_snprintf_show(const struct btf *btf, u32 type_id, void *obj,
214 char *buf, int len, u64 flags);
215
216int btf_get_fd_by_id(u32 id);
217u32 btf_obj_id(const struct btf *btf);
218bool btf_is_kernel(const struct btf *btf);
219bool btf_is_module(const struct btf *btf);
220bool btf_is_vmlinux(const struct btf *btf);
221struct module *btf_try_get_module(const struct btf *btf);
222u32 btf_nr_types(const struct btf *btf);
223u32 btf_named_start_id(const struct btf *btf, bool own);
224struct btf *btf_base_btf(const struct btf *btf);
225bool btf_type_is_i32(const struct btf_type *t);
226bool btf_type_is_i64(const struct btf_type *t);
227bool btf_type_is_primitive(const struct btf_type *t);
228bool btf_member_is_reg_int(const struct btf *btf, const struct btf_type *s,
229 const struct btf_member *m,
230 u32 expected_offset, u32 expected_size);
231struct btf_record *btf_parse_fields(const struct btf *btf, const struct btf_type *t,
232 u32 field_mask, u32 value_size);
233int btf_check_and_fixup_fields(const struct btf *btf, struct btf_record *rec);
234bool btf_type_is_void(const struct btf_type *t);
235s32 btf_find_by_name_kind(const struct btf *btf, const char *name, u8 kind);
236s32 bpf_find_btf_id(const char *name, u32 kind, struct btf **btf_p);
237const struct btf_type *btf_type_skip_modifiers(const struct btf *btf,
238 u32 id, u32 *res_id);
239const struct btf_type *btf_type_resolve_ptr(const struct btf *btf,
240 u32 id, u32 *res_id);
241const struct btf_type *btf_type_resolve_func_ptr(const struct btf *btf,
242 u32 id, u32 *res_id);
243const struct btf_type *
244btf_resolve_size(const struct btf *btf, const struct btf_type *type,
245 u32 *type_size);
246const char *btf_type_str(const struct btf_type *t);
247
248#define for_each_member(i, struct_type, member) \
249 for (i = 0, member = btf_type_member(struct_type); \
250 i < btf_type_vlen(struct_type); \
251 i++, member++)
252
253#define for_each_vsi(i, datasec_type, member) \
254 for (i = 0, member = btf_type_var_secinfo(datasec_type); \
255 i < btf_type_vlen(datasec_type); \
256 i++, member++)
257
258static inline bool btf_type_is_ptr(const struct btf_type *t)
259{
260 return BTF_INFO_KIND(t->info) == BTF_KIND_PTR;
261}
262
263static inline bool btf_type_is_int(const struct btf_type *t)
264{
265 return BTF_INFO_KIND(t->info) == BTF_KIND_INT;
266}
267
268static inline bool btf_type_is_small_int(const struct btf_type *t)
269{
270 return btf_type_is_int(t) && t->size <= sizeof(u64);
271}
272
273static inline u8 btf_int_encoding(const struct btf_type *t)
274{
275 return BTF_INT_ENCODING(*(u32 *)(t + 1));
276}
277
278static inline bool btf_type_is_signed_int(const struct btf_type *t)
279{
280 return btf_type_is_int(t) && (btf_int_encoding(t) & BTF_INT_SIGNED);
281}
282
283static inline bool btf_type_is_enum(const struct btf_type *t)
284{
285 return BTF_INFO_KIND(t->info) == BTF_KIND_ENUM;
286}
287
288static inline bool btf_is_any_enum(const struct btf_type *t)
289{
290 return BTF_INFO_KIND(t->info) == BTF_KIND_ENUM ||
291 BTF_INFO_KIND(t->info) == BTF_KIND_ENUM64;
292}
293
294static inline bool btf_kind_core_compat(const struct btf_type *t1,
295 const struct btf_type *t2)
296{
297 return BTF_INFO_KIND(t1->info) == BTF_INFO_KIND(t2->info) ||
298 (btf_is_any_enum(t1) && btf_is_any_enum(t2));
299}
300
301static inline bool str_is_empty(const char *s)
302{
303 return !s || !s[0];
304}
305
306static inline u16 btf_kind(const struct btf_type *t)
307{
308 return BTF_INFO_KIND(t->info);
309}
310
311static inline bool btf_is_enum(const struct btf_type *t)
312{
313 return btf_kind(t) == BTF_KIND_ENUM;
314}
315
316static inline bool btf_is_enum64(const struct btf_type *t)
317{
318 return btf_kind(t) == BTF_KIND_ENUM64;
319}
320
321static inline u64 btf_enum64_value(const struct btf_enum64 *e)
322{
323 return ((u64)e->val_hi32 << 32) | e->val_lo32;
324}
325
326static inline bool btf_is_composite(const struct btf_type *t)
327{
328 u16 kind = btf_kind(t);
329
330 return kind == BTF_KIND_STRUCT || kind == BTF_KIND_UNION;
331}
332
333static inline bool btf_is_array(const struct btf_type *t)
334{
335 return btf_kind(t) == BTF_KIND_ARRAY;
336}
337
338static inline bool btf_is_int(const struct btf_type *t)
339{
340 return btf_kind(t) == BTF_KIND_INT;
341}
342
343static inline bool btf_is_ptr(const struct btf_type *t)
344{
345 return btf_kind(t) == BTF_KIND_PTR;
346}
347
348static inline u8 btf_int_offset(const struct btf_type *t)
349{
350 return BTF_INT_OFFSET(*(u32 *)(t + 1));
351}
352
353static inline __u8 btf_int_bits(const struct btf_type *t)
354{
355 return BTF_INT_BITS(*(__u32 *)(t + 1));
356}
357
358static inline bool btf_type_is_scalar(const struct btf_type *t)
359{
360 return btf_type_is_int(t) || btf_type_is_enum(t);
361}
362
363static inline bool btf_type_is_fwd(const struct btf_type *t)
364{
365 return BTF_INFO_KIND(t->info) == BTF_KIND_FWD;
366}
367
368static inline bool btf_type_is_typedef(const struct btf_type *t)
369{
370 return BTF_INFO_KIND(t->info) == BTF_KIND_TYPEDEF;
371}
372
373static inline bool btf_type_is_volatile(const struct btf_type *t)
374{
375 return BTF_INFO_KIND(t->info) == BTF_KIND_VOLATILE;
376}
377
378static inline bool btf_type_is_func(const struct btf_type *t)
379{
380 return BTF_INFO_KIND(t->info) == BTF_KIND_FUNC;
381}
382
383static inline bool btf_type_is_func_proto(const struct btf_type *t)
384{
385 return BTF_INFO_KIND(t->info) == BTF_KIND_FUNC_PROTO;
386}
387
388static inline bool btf_type_is_var(const struct btf_type *t)
389{
390 return BTF_INFO_KIND(t->info) == BTF_KIND_VAR;
391}
392
393static inline bool btf_type_is_type_tag(const struct btf_type *t)
394{
395 return BTF_INFO_KIND(t->info) == BTF_KIND_TYPE_TAG;
396}
397
398/* union is only a special case of struct:
399 * all its offsetof(member) == 0
400 */
401static inline bool btf_type_is_struct(const struct btf_type *t)
402{
403 u8 kind = BTF_INFO_KIND(t->info);
404
405 return kind == BTF_KIND_STRUCT || kind == BTF_KIND_UNION;
406}
407
408static inline bool __btf_type_is_struct(const struct btf_type *t)
409{
410 return BTF_INFO_KIND(t->info) == BTF_KIND_STRUCT;
411}
412
413static inline bool btf_type_is_array(const struct btf_type *t)
414{
415 return BTF_INFO_KIND(t->info) == BTF_KIND_ARRAY;
416}
417
418static inline u16 btf_type_vlen(const struct btf_type *t)
419{
420 return BTF_INFO_VLEN(t->info);
421}
422
423static inline u16 btf_vlen(const struct btf_type *t)
424{
425 return btf_type_vlen(t);
426}
427
428static inline u16 btf_func_linkage(const struct btf_type *t)
429{
430 return BTF_INFO_VLEN(t->info);
431}
432
433static inline bool btf_type_kflag(const struct btf_type *t)
434{
435 return BTF_INFO_KFLAG(t->info);
436}
437
438static inline u32 __btf_member_bit_offset(const struct btf_type *struct_type,
439 const struct btf_member *member)
440{
441 return btf_type_kflag(struct_type) ? BTF_MEMBER_BIT_OFFSET(member->offset)
442 : member->offset;
443}
444
445static inline u32 __btf_member_bitfield_size(const struct btf_type *struct_type,
446 const struct btf_member *member)
447{
448 return btf_type_kflag(struct_type) ? BTF_MEMBER_BITFIELD_SIZE(member->offset)
449 : 0;
450}
451
452static inline struct btf_member *btf_members(const struct btf_type *t)
453{
454 return (struct btf_member *)(t + 1);
455}
456
457static inline u32 btf_member_bit_offset(const struct btf_type *t, u32 member_idx)
458{
459 const struct btf_member *m = btf_members(t) + member_idx;
460
461 return __btf_member_bit_offset(t, m);
462}
463
464static inline u32 btf_member_bitfield_size(const struct btf_type *t, u32 member_idx)
465{
466 const struct btf_member *m = btf_members(t) + member_idx;
467
468 return __btf_member_bitfield_size(t, m);
469}
470
471static inline const struct btf_member *btf_type_member(const struct btf_type *t)
472{
473 return (const struct btf_member *)(t + 1);
474}
475
476static inline struct btf_array *btf_array(const struct btf_type *t)
477{
478 return (struct btf_array *)(t + 1);
479}
480
481static inline struct btf_enum *btf_enum(const struct btf_type *t)
482{
483 return (struct btf_enum *)(t + 1);
484}
485
486static inline struct btf_enum64 *btf_enum64(const struct btf_type *t)
487{
488 return (struct btf_enum64 *)(t + 1);
489}
490
491static inline const struct btf_var_secinfo *btf_type_var_secinfo(
492 const struct btf_type *t)
493{
494 return (const struct btf_var_secinfo *)(t + 1);
495}
496
497static inline struct btf_param *btf_params(const struct btf_type *t)
498{
499 return (struct btf_param *)(t + 1);
500}
501
502static inline struct btf_decl_tag *btf_decl_tag(const struct btf_type *t)
503{
504 return (struct btf_decl_tag *)(t + 1);
505}
506
507static inline int btf_id_cmp_func(const void *a, const void *b)
508{
509 const int *pa = a, *pb = b;
510
511 return *pa - *pb;
512}
513
514static inline bool btf_id_set_contains(const struct btf_id_set *set, u32 id)
515{
516 return bsearch(&id, set->ids, set->cnt, sizeof(u32), btf_id_cmp_func) != NULL;
517}
518
519static inline void *btf_id_set8_contains(const struct btf_id_set8 *set, u32 id)
520{
521 return bsearch(&id, set->pairs, set->cnt, sizeof(set->pairs[0]), btf_id_cmp_func);
522}
523
524bool btf_param_match_suffix(const struct btf *btf,
525 const struct btf_param *arg,
526 const char *suffix);
527int btf_ctx_arg_offset(const struct btf *btf, const struct btf_type *func_proto,
528 u32 arg_no);
529u32 btf_ctx_arg_idx(struct btf *btf, const struct btf_type *func_proto, int off);
530
531struct bpf_verifier_log;
532
533#if defined(CONFIG_BPF_JIT) && defined(CONFIG_BPF_SYSCALL)
534struct bpf_struct_ops;
535int __register_bpf_struct_ops(struct bpf_struct_ops *st_ops);
536const struct bpf_struct_ops_desc *bpf_struct_ops_find_value(struct btf *btf, u32 value_id);
537const struct bpf_struct_ops_desc *bpf_struct_ops_find(struct btf *btf, u32 type_id);
538#else
539static inline const struct bpf_struct_ops_desc *bpf_struct_ops_find(struct btf *btf, u32 type_id)
540{
541 return NULL;
542}
543#endif
544
545enum btf_field_iter_kind {
546 BTF_FIELD_ITER_IDS,
547 BTF_FIELD_ITER_STRS,
548};
549
550struct btf_field_desc {
551 /* once-per-type offsets */
552 int t_off_cnt, t_offs[2];
553 /* member struct size, or zero, if no members */
554 int m_sz;
555 /* repeated per-member offsets */
556 int m_off_cnt, m_offs[1];
557};
558
559struct btf_field_iter {
560 struct btf_field_desc desc;
561 void *p;
562 int m_idx;
563 int off_idx;
564 int vlen;
565};
566
567#ifdef CONFIG_BPF_SYSCALL
568const struct btf_type *btf_type_by_id(const struct btf *btf, u32 type_id);
569void btf_set_base_btf(struct btf *btf, const struct btf *base_btf);
570int btf_relocate(struct btf *btf, const struct btf *base_btf, __u32 **map_ids);
571int btf_field_iter_init(struct btf_field_iter *it, struct btf_type *t,
572 enum btf_field_iter_kind iter_kind);
573__u32 *btf_field_iter_next(struct btf_field_iter *it);
574
575const char *btf_name_by_offset(const struct btf *btf, u32 offset);
576const char *btf_str_by_offset(const struct btf *btf, u32 offset);
577struct btf *btf_parse_vmlinux(void);
578struct btf *bpf_prog_get_target_btf(const struct bpf_prog *prog);
579u32 *btf_kfunc_flags(const struct btf *btf, u32 kfunc_btf_id, const struct bpf_prog *prog);
580bool btf_kfunc_is_allowed(const struct btf *btf, u32 kfunc_btf_id, const struct bpf_prog *prog);
581u32 *btf_kfunc_is_modify_return(const struct btf *btf, u32 kfunc_btf_id,
582 const struct bpf_prog *prog);
583int register_btf_kfunc_id_set(enum bpf_prog_type prog_type,
584 const struct btf_kfunc_id_set *s);
585int register_btf_fmodret_id_set(const struct btf_kfunc_id_set *kset);
586s32 btf_find_dtor_kfunc(struct btf *btf, u32 btf_id);
587int register_btf_id_dtor_kfuncs(const struct btf_id_dtor_kfunc *dtors, u32 add_cnt,
588 struct module *owner);
589struct btf_struct_meta *btf_find_struct_meta(const struct btf *btf, u32 btf_id);
590bool btf_is_projection_of(const char *pname, const char *tname);
591bool btf_is_prog_ctx_type(struct bpf_verifier_log *log, const struct btf *btf,
592 const struct btf_type *t, enum bpf_prog_type prog_type,
593 int arg);
594int get_kern_ctx_btf_id(struct bpf_verifier_log *log, enum bpf_prog_type prog_type);
595bool btf_types_are_same(const struct btf *btf1, u32 id1,
596 const struct btf *btf2, u32 id2);
597int btf_check_iter_arg(struct btf *btf, const struct btf_type *func, int arg_idx);
598
599static inline bool btf_type_is_struct_ptr(struct btf *btf, const struct btf_type *t)
600{
601 if (!btf_type_is_ptr(t))
602 return false;
603
604 t = btf_type_skip_modifiers(btf, t->type, NULL);
605
606 return btf_type_is_struct(t);
607}
608#else
609static inline const struct btf_type *btf_type_by_id(const struct btf *btf,
610 u32 type_id)
611{
612 return NULL;
613}
614
615static inline void btf_set_base_btf(struct btf *btf, const struct btf *base_btf)
616{
617}
618
619static inline int btf_relocate(void *log, struct btf *btf, const struct btf *base_btf,
620 __u32 **map_ids)
621{
622 return -EOPNOTSUPP;
623}
624
625static inline int btf_field_iter_init(struct btf_field_iter *it, struct btf_type *t,
626 enum btf_field_iter_kind iter_kind)
627{
628 return -EOPNOTSUPP;
629}
630
631static inline __u32 *btf_field_iter_next(struct btf_field_iter *it)
632{
633 return NULL;
634}
635
636static inline const char *btf_name_by_offset(const struct btf *btf,
637 u32 offset)
638{
639 return NULL;
640}
641static inline u32 *btf_kfunc_id_set_contains(const struct btf *btf,
642 u32 kfunc_btf_id,
643 struct bpf_prog *prog)
644
645{
646 return NULL;
647}
648static inline int register_btf_kfunc_id_set(enum bpf_prog_type prog_type,
649 const struct btf_kfunc_id_set *s)
650{
651 return 0;
652}
653static inline s32 btf_find_dtor_kfunc(struct btf *btf, u32 btf_id)
654{
655 return -ENOENT;
656}
657static inline int register_btf_id_dtor_kfuncs(const struct btf_id_dtor_kfunc *dtors,
658 u32 add_cnt, struct module *owner)
659{
660 return 0;
661}
662static inline struct btf_struct_meta *btf_find_struct_meta(const struct btf *btf, u32 btf_id)
663{
664 return NULL;
665}
666static inline bool
667btf_is_prog_ctx_type(struct bpf_verifier_log *log, const struct btf *btf,
668 const struct btf_type *t, enum bpf_prog_type prog_type,
669 int arg)
670{
671 return false;
672}
673static inline int get_kern_ctx_btf_id(struct bpf_verifier_log *log,
674 enum bpf_prog_type prog_type) {
675 return -EINVAL;
676}
677static inline bool btf_types_are_same(const struct btf *btf1, u32 id1,
678 const struct btf *btf2, u32 id2)
679{
680 return false;
681}
682static inline int btf_check_iter_arg(struct btf *btf, const struct btf_type *func, int arg_idx)
683{
684 return -EOPNOTSUPP;
685}
686#endif
687#endif