1 /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
4 * Common eBPF ELF object loading operations.
6 * Copyright (C) 2013-2015 Alexei Starovoitov <ast@kernel.org>
7 * Copyright (C) 2015 Wang Nan <wangnan0@huawei.com>
8 * Copyright (C) 2015 Huawei Inc.
10 #ifndef __LIBBPF_LIBBPF_H
11 #define __LIBBPF_LIBBPF_H
17 #include <sys/types.h> // for size_t
18 #include <linux/bpf.h>
20 #include "libbpf_common.h"
21 #include "libbpf_legacy.h"
27 LIBBPF_API __u32 libbpf_major_version(void);
28 LIBBPF_API __u32 libbpf_minor_version(void);
29 LIBBPF_API const char *libbpf_version_string(void);
32 __LIBBPF_ERRNO__START = 4000,
34 /* Something wrong in libelf */
35 LIBBPF_ERRNO__LIBELF = __LIBBPF_ERRNO__START,
36 LIBBPF_ERRNO__FORMAT, /* BPF object format invalid */
37 LIBBPF_ERRNO__KVERSION, /* Incorrect or no 'version' section */
38 LIBBPF_ERRNO__ENDIAN, /* Endian mismatch */
39 LIBBPF_ERRNO__INTERNAL, /* Internal error in libbpf */
40 LIBBPF_ERRNO__RELOC, /* Relocation failed */
41 LIBBPF_ERRNO__LOAD, /* Load program failure for unknown reason */
42 LIBBPF_ERRNO__VERIFY, /* Kernel verifier blocks program loading */
43 LIBBPF_ERRNO__PROG2BIG, /* Program too big */
44 LIBBPF_ERRNO__KVER, /* Incorrect kernel version */
45 LIBBPF_ERRNO__PROGTYPE, /* Kernel doesn't support this program type */
46 LIBBPF_ERRNO__WRNGPID, /* Wrong pid in netlink message */
47 LIBBPF_ERRNO__INVSEQ, /* Invalid netlink sequence */
48 LIBBPF_ERRNO__NLPARSE, /* netlink parsing error */
52 LIBBPF_API int libbpf_strerror(int err, char *buf, size_t size);
54 enum libbpf_print_level {
60 typedef int (*libbpf_print_fn_t)(enum libbpf_print_level level,
61 const char *, va_list ap);
63 LIBBPF_API libbpf_print_fn_t libbpf_set_print(libbpf_print_fn_t fn);
65 /* Hide internal to user */
68 struct bpf_object_open_attr {
70 enum bpf_prog_type prog_type;
73 struct bpf_object_open_opts {
74 /* size of this struct, for forward/backward compatiblity */
76 /* object name override, if provided:
77 * - for object open from file, this will override setting object
78 * name from file path's base name;
79 * - for object open from memory buffer, this will specify an object
80 * name and will override default "<addr>-<buf-size>" name;
82 const char *object_name;
83 /* parse map definitions non-strictly, allowing extra attributes/data */
85 /* DEPRECATED: handle CO-RE relocations non-strictly, allowing failures.
86 * Value is ignored. Relocations always are processed non-strictly.
87 * Non-relocatable instructions are replaced with invalid ones to
88 * prevent accidental errors.
90 LIBBPF_DEPRECATED_SINCE(0, 6, "field has no effect")
91 bool relaxed_core_relocs;
92 /* maps that set the 'pinning' attribute in their definition will have
93 * their pin_path attribute set to a file in this directory, and be
94 * auto-pinned to that path on load; defaults to "/sys/fs/bpf".
96 const char *pin_root_path;
98 LIBBPF_DEPRECATED_SINCE(0, 7, "use bpf_program__set_attach_target() on each individual bpf_program")
100 /* Additional kernel config content that augments and overrides
101 * system Kconfig for CONFIG_xxx externs.
104 /* Path to the custom BTF to be used for BPF CO-RE relocations.
105 * This custom BTF completely replaces the use of vmlinux BTF
106 * for the purpose of CO-RE relocations.
107 * NOTE: any other BPF feature (e.g., fentry/fexit programs,
108 * struct_ops, etc) will need actual kernel BTF at /sys/kernel/btf/vmlinux.
110 const char *btf_custom_path;
111 /* Pointer to a buffer for storing kernel logs for applicable BPF
112 * commands. Valid kernel_log_size has to be specified as well and are
113 * passed-through to bpf() syscall. Keep in mind that kernel might
114 * fail operation with -ENOSPC error if provided buffer is too small
115 * to contain entire log output.
116 * See the comment below for kernel_log_level for interaction between
117 * log_buf and log_level settings.
119 * If specified, this log buffer will be passed for:
120 * - each BPF progral load (BPF_PROG_LOAD) attempt, unless overriden
121 * with bpf_program__set_log() on per-program level, to get
122 * BPF verifier log output.
123 * - during BPF object's BTF load into kernel (BPF_BTF_LOAD) to get
124 * BTF sanity checking log.
126 * Each BPF command (BPF_BTF_LOAD or BPF_PROG_LOAD) will overwrite
127 * previous contents, so if you need more fine-grained control, set
128 * per-program buffer with bpf_program__set_log_buf() to preserve each
129 * individual program's verification log. Keep using kernel_log_buf
130 * for BTF verification log, if necessary.
132 char *kernel_log_buf;
133 size_t kernel_log_size;
135 * Log level can be set independently from log buffer. Log_level=0
136 * means that libbpf will attempt loading BTF or program without any
137 * logging requested, but will retry with either its own or custom log
138 * buffer, if provided, and log_level=1 on any error.
139 * And vice versa, setting log_level>0 will request BTF or prog
140 * loading with verbose log from the first attempt (and as such also
141 * for successfully loaded BTF or program), and the actual log buffer
142 * could be either libbpf's own auto-allocated log buffer, if
143 * kernel_log_buffer is NULL, or user-provided custom kernel_log_buf.
144 * If user didn't provide custom log buffer, libbpf will emit captured
145 * logs through its print callback.
147 __u32 kernel_log_level;
151 #define bpf_object_open_opts__last_field kernel_log_level
153 LIBBPF_API struct bpf_object *bpf_object__open(const char *path);
156 * @brief **bpf_object__open_file()** creates a bpf_object by opening
157 * the BPF ELF object file pointed to by the passed path and loading it
159 * @param path BPF object file path
160 * @param opts options for how to load the bpf object, this parameter is
161 * optional and can be set to NULL
162 * @return pointer to the new bpf_object; or NULL is returned on error,
163 * error code is stored in errno
165 LIBBPF_API struct bpf_object *
166 bpf_object__open_file(const char *path, const struct bpf_object_open_opts *opts);
169 * @brief **bpf_object__open_mem()** creates a bpf_object by reading
170 * the BPF objects raw bytes from a memory buffer containing a valid
171 * BPF ELF object file.
172 * @param obj_buf pointer to the buffer containing ELF file bytes
173 * @param obj_buf_sz number of bytes in the buffer
174 * @param opts options for how to load the bpf object
175 * @return pointer to the new bpf_object; or NULL is returned on error,
176 * error code is stored in errno
178 LIBBPF_API struct bpf_object *
179 bpf_object__open_mem(const void *obj_buf, size_t obj_buf_sz,
180 const struct bpf_object_open_opts *opts);
182 /* deprecated bpf_object__open variants */
183 LIBBPF_API struct bpf_object *
184 bpf_object__open_buffer(const void *obj_buf, size_t obj_buf_sz,
186 LIBBPF_API struct bpf_object *
187 bpf_object__open_xattr(struct bpf_object_open_attr *attr);
189 enum libbpf_pin_type {
191 /* PIN_BY_NAME: pin maps by name (in /sys/fs/bpf by default) */
195 /* pin_maps and unpin_maps can both be called with a NULL path, in which case
196 * they will use the pin_path attribute of each map (and ignore all maps that
197 * don't have a pin_path set).
199 LIBBPF_API int bpf_object__pin_maps(struct bpf_object *obj, const char *path);
200 LIBBPF_API int bpf_object__unpin_maps(struct bpf_object *obj,
202 LIBBPF_API int bpf_object__pin_programs(struct bpf_object *obj,
204 LIBBPF_API int bpf_object__unpin_programs(struct bpf_object *obj,
206 LIBBPF_API int bpf_object__pin(struct bpf_object *object, const char *path);
207 LIBBPF_API void bpf_object__close(struct bpf_object *object);
209 struct bpf_object_load_attr {
210 struct bpf_object *obj;
212 const char *target_btf_path;
215 /* Load/unload object into/from kernel */
216 LIBBPF_API int bpf_object__load(struct bpf_object *obj);
217 LIBBPF_DEPRECATED_SINCE(0, 8, "use bpf_object__load() instead")
218 LIBBPF_API int bpf_object__load_xattr(struct bpf_object_load_attr *attr);
219 LIBBPF_DEPRECATED_SINCE(0, 6, "bpf_object__unload() is deprecated, use bpf_object__close() instead")
220 LIBBPF_API int bpf_object__unload(struct bpf_object *obj);
222 LIBBPF_API const char *bpf_object__name(const struct bpf_object *obj);
223 LIBBPF_API unsigned int bpf_object__kversion(const struct bpf_object *obj);
224 LIBBPF_API int bpf_object__set_kversion(struct bpf_object *obj, __u32 kern_version);
227 LIBBPF_API struct btf *bpf_object__btf(const struct bpf_object *obj);
228 LIBBPF_API int bpf_object__btf_fd(const struct bpf_object *obj);
230 LIBBPF_DEPRECATED_SINCE(0, 7, "use bpf_object__find_program_by_name() instead")
231 LIBBPF_API struct bpf_program *
232 bpf_object__find_program_by_title(const struct bpf_object *obj,
234 LIBBPF_API struct bpf_program *
235 bpf_object__find_program_by_name(const struct bpf_object *obj,
238 LIBBPF_API LIBBPF_DEPRECATED_SINCE(0, 7, "track bpf_objects in application code instead")
239 struct bpf_object *bpf_object__next(struct bpf_object *prev);
240 #define bpf_object__for_each_safe(pos, tmp) \
241 for ((pos) = bpf_object__next(NULL), \
242 (tmp) = bpf_object__next(pos); \
244 (pos) = (tmp), (tmp) = bpf_object__next(tmp))
246 typedef void (*bpf_object_clear_priv_t)(struct bpf_object *, void *);
247 LIBBPF_API int bpf_object__set_priv(struct bpf_object *obj, void *priv,
248 bpf_object_clear_priv_t clear_priv);
249 LIBBPF_API void *bpf_object__priv(const struct bpf_object *prog);
252 libbpf_prog_type_by_name(const char *name, enum bpf_prog_type *prog_type,
253 enum bpf_attach_type *expected_attach_type);
254 LIBBPF_API int libbpf_attach_type_by_name(const char *name,
255 enum bpf_attach_type *attach_type);
256 LIBBPF_API int libbpf_find_vmlinux_btf_id(const char *name,
257 enum bpf_attach_type attach_type);
259 /* Accessors of bpf_program */
261 LIBBPF_API LIBBPF_DEPRECATED_SINCE(0, 7, "use bpf_object__next_program() instead")
262 struct bpf_program *bpf_program__next(struct bpf_program *prog,
263 const struct bpf_object *obj);
264 LIBBPF_API struct bpf_program *
265 bpf_object__next_program(const struct bpf_object *obj, struct bpf_program *prog);
267 #define bpf_object__for_each_program(pos, obj) \
268 for ((pos) = bpf_object__next_program((obj), NULL); \
270 (pos) = bpf_object__next_program((obj), (pos)))
272 LIBBPF_API LIBBPF_DEPRECATED_SINCE(0, 7, "use bpf_object__prev_program() instead")
273 struct bpf_program *bpf_program__prev(struct bpf_program *prog,
274 const struct bpf_object *obj);
275 LIBBPF_API struct bpf_program *
276 bpf_object__prev_program(const struct bpf_object *obj, struct bpf_program *prog);
278 typedef void (*bpf_program_clear_priv_t)(struct bpf_program *, void *);
280 LIBBPF_API int bpf_program__set_priv(struct bpf_program *prog, void *priv,
281 bpf_program_clear_priv_t clear_priv);
283 LIBBPF_API void *bpf_program__priv(const struct bpf_program *prog);
284 LIBBPF_API void bpf_program__set_ifindex(struct bpf_program *prog,
287 LIBBPF_API const char *bpf_program__name(const struct bpf_program *prog);
288 LIBBPF_API const char *bpf_program__section_name(const struct bpf_program *prog);
289 LIBBPF_API LIBBPF_DEPRECATED("BPF program title is confusing term; please use bpf_program__section_name() instead")
290 const char *bpf_program__title(const struct bpf_program *prog, bool needs_copy);
291 LIBBPF_API bool bpf_program__autoload(const struct bpf_program *prog);
292 LIBBPF_API int bpf_program__set_autoload(struct bpf_program *prog, bool autoload);
294 /* returns program size in bytes */
295 LIBBPF_DEPRECATED_SINCE(0, 7, "use bpf_program__insn_cnt() instead")
296 LIBBPF_API size_t bpf_program__size(const struct bpf_program *prog);
301 * @brief **bpf_program__insns()** gives read-only access to BPF program's
302 * underlying BPF instructions.
303 * @param prog BPF program for which to return instructions
304 * @return a pointer to an array of BPF instructions that belong to the
305 * specified BPF program
307 * Returned pointer is always valid and not NULL. Number of `struct bpf_insn`
308 * pointed to can be fetched using **bpf_program__insn_cnt()** API.
310 * Keep in mind, libbpf can modify and append/delete BPF program's
311 * instructions as it processes BPF object file and prepares everything for
312 * uploading into the kernel. So depending on the point in BPF object
313 * lifetime, **bpf_program__insns()** can return different sets of
314 * instructions. As an example, during BPF object load phase BPF program
315 * instructions will be CO-RE-relocated, BPF subprograms instructions will be
316 * appended, ldimm64 instructions will have FDs embedded, etc. So instructions
317 * returned before **bpf_object__load()** and after it might be quite
320 LIBBPF_API const struct bpf_insn *bpf_program__insns(const struct bpf_program *prog);
322 * @brief **bpf_program__insn_cnt()** returns number of `struct bpf_insn`'s
323 * that form specified BPF program.
324 * @param prog BPF program for which to return number of BPF instructions
326 * See **bpf_program__insns()** documentation for notes on how libbpf can
327 * change instructions and their count during different phases of
328 * **bpf_object** lifetime.
330 LIBBPF_API size_t bpf_program__insn_cnt(const struct bpf_program *prog);
332 LIBBPF_DEPRECATED_SINCE(0, 6, "use bpf_object__load() instead")
333 LIBBPF_API int bpf_program__load(struct bpf_program *prog, const char *license, __u32 kern_version);
334 LIBBPF_API int bpf_program__fd(const struct bpf_program *prog);
335 LIBBPF_DEPRECATED_SINCE(0, 7, "multi-instance bpf_program support is deprecated")
336 LIBBPF_API int bpf_program__pin_instance(struct bpf_program *prog,
339 LIBBPF_DEPRECATED_SINCE(0, 7, "multi-instance bpf_program support is deprecated")
340 LIBBPF_API int bpf_program__unpin_instance(struct bpf_program *prog,
345 * @brief **bpf_program__pin()** pins the BPF program to a file
346 * in the BPF FS specified by a path. This increments the programs
347 * reference count, allowing it to stay loaded after the process
348 * which loaded it has exited.
350 * @param prog BPF program to pin, must already be loaded
351 * @param path file path in a BPF file system
352 * @return 0, on success; negative error code, otherwise
354 LIBBPF_API int bpf_program__pin(struct bpf_program *prog, const char *path);
357 * @brief **bpf_program__unpin()** unpins the BPF program from a file
358 * in the BPFFS specified by a path. This decrements the programs
361 * The file pinning the BPF program can also be unlinked by a different
362 * process in which case this function will return an error.
364 * @param prog BPF program to unpin
365 * @param path file path to the pin in a BPF file system
366 * @return 0, on success; negative error code, otherwise
368 LIBBPF_API int bpf_program__unpin(struct bpf_program *prog, const char *path);
369 LIBBPF_API void bpf_program__unload(struct bpf_program *prog);
373 LIBBPF_API struct bpf_link *bpf_link__open(const char *path);
374 LIBBPF_API int bpf_link__fd(const struct bpf_link *link);
375 LIBBPF_API const char *bpf_link__pin_path(const struct bpf_link *link);
376 LIBBPF_API int bpf_link__pin(struct bpf_link *link, const char *path);
377 LIBBPF_API int bpf_link__unpin(struct bpf_link *link);
378 LIBBPF_API int bpf_link__update_program(struct bpf_link *link,
379 struct bpf_program *prog);
380 LIBBPF_API void bpf_link__disconnect(struct bpf_link *link);
381 LIBBPF_API int bpf_link__detach(struct bpf_link *link);
382 LIBBPF_API int bpf_link__destroy(struct bpf_link *link);
384 LIBBPF_API struct bpf_link *
385 bpf_program__attach(const struct bpf_program *prog);
387 struct bpf_perf_event_opts {
388 /* size of this struct, for forward/backward compatiblity */
390 /* custom user-provided value fetchable through bpf_get_attach_cookie() */
393 #define bpf_perf_event_opts__last_field bpf_cookie
395 LIBBPF_API struct bpf_link *
396 bpf_program__attach_perf_event(const struct bpf_program *prog, int pfd);
398 LIBBPF_API struct bpf_link *
399 bpf_program__attach_perf_event_opts(const struct bpf_program *prog, int pfd,
400 const struct bpf_perf_event_opts *opts);
402 struct bpf_kprobe_opts {
403 /* size of this struct, for forward/backward compatiblity */
405 /* custom user-provided value fetchable through bpf_get_attach_cookie() */
407 /* function's offset to install kprobe to */
409 /* kprobe is return probe */
413 #define bpf_kprobe_opts__last_field retprobe
415 LIBBPF_API struct bpf_link *
416 bpf_program__attach_kprobe(const struct bpf_program *prog, bool retprobe,
417 const char *func_name);
418 LIBBPF_API struct bpf_link *
419 bpf_program__attach_kprobe_opts(const struct bpf_program *prog,
420 const char *func_name,
421 const struct bpf_kprobe_opts *opts);
423 struct bpf_uprobe_opts {
424 /* size of this struct, for forward/backward compatiblity */
426 /* offset of kernel reference counted USDT semaphore, added in
427 * a6ca88b241d5 ("trace_uprobe: support reference counter in fd-based uprobe")
429 size_t ref_ctr_offset;
430 /* custom user-provided value fetchable through bpf_get_attach_cookie() */
432 /* uprobe is return probe, invoked at function return time */
436 #define bpf_uprobe_opts__last_field retprobe
439 * @brief **bpf_program__attach_uprobe()** attaches a BPF program
440 * to the userspace function which is found by binary path and
441 * offset. You can optionally specify a particular proccess to attach
442 * to. You can also optionally attach the program to the function
443 * exit instead of entry.
445 * @param prog BPF program to attach
446 * @param retprobe Attach to function exit
447 * @param pid Process ID to attach the uprobe to, 0 for self (own process),
448 * -1 for all processes
449 * @param binary_path Path to binary that contains the function symbol
450 * @param func_offset Offset within the binary of the function symbol
451 * @return Reference to the newly created BPF link; or NULL is returned on error,
452 * error code is stored in errno
454 LIBBPF_API struct bpf_link *
455 bpf_program__attach_uprobe(const struct bpf_program *prog, bool retprobe,
456 pid_t pid, const char *binary_path,
460 * @brief **bpf_program__attach_uprobe_opts()** is just like
461 * bpf_program__attach_uprobe() except with a options struct
462 * for various configurations.
464 * @param prog BPF program to attach
465 * @param pid Process ID to attach the uprobe to, 0 for self (own process),
466 * -1 for all processes
467 * @param binary_path Path to binary that contains the function symbol
468 * @param func_offset Offset within the binary of the function symbol
469 * @param opts Options for altering program attachment
470 * @return Reference to the newly created BPF link; or NULL is returned on error,
471 * error code is stored in errno
473 LIBBPF_API struct bpf_link *
474 bpf_program__attach_uprobe_opts(const struct bpf_program *prog, pid_t pid,
475 const char *binary_path, size_t func_offset,
476 const struct bpf_uprobe_opts *opts);
478 struct bpf_tracepoint_opts {
479 /* size of this struct, for forward/backward compatiblity */
481 /* custom user-provided value fetchable through bpf_get_attach_cookie() */
484 #define bpf_tracepoint_opts__last_field bpf_cookie
486 LIBBPF_API struct bpf_link *
487 bpf_program__attach_tracepoint(const struct bpf_program *prog,
488 const char *tp_category,
489 const char *tp_name);
490 LIBBPF_API struct bpf_link *
491 bpf_program__attach_tracepoint_opts(const struct bpf_program *prog,
492 const char *tp_category,
494 const struct bpf_tracepoint_opts *opts);
496 LIBBPF_API struct bpf_link *
497 bpf_program__attach_raw_tracepoint(const struct bpf_program *prog,
498 const char *tp_name);
499 LIBBPF_API struct bpf_link *
500 bpf_program__attach_trace(const struct bpf_program *prog);
501 LIBBPF_API struct bpf_link *
502 bpf_program__attach_lsm(const struct bpf_program *prog);
503 LIBBPF_API struct bpf_link *
504 bpf_program__attach_cgroup(const struct bpf_program *prog, int cgroup_fd);
505 LIBBPF_API struct bpf_link *
506 bpf_program__attach_netns(const struct bpf_program *prog, int netns_fd);
507 LIBBPF_API struct bpf_link *
508 bpf_program__attach_xdp(const struct bpf_program *prog, int ifindex);
509 LIBBPF_API struct bpf_link *
510 bpf_program__attach_freplace(const struct bpf_program *prog,
511 int target_fd, const char *attach_func_name);
515 LIBBPF_API struct bpf_link *bpf_map__attach_struct_ops(const struct bpf_map *map);
517 struct bpf_iter_attach_opts {
518 size_t sz; /* size of this struct for forward/backward compatibility */
519 union bpf_iter_link_info *link_info;
522 #define bpf_iter_attach_opts__last_field link_info_len
524 LIBBPF_API struct bpf_link *
525 bpf_program__attach_iter(const struct bpf_program *prog,
526 const struct bpf_iter_attach_opts *opts);
529 * Libbpf allows callers to adjust BPF programs before being loaded
530 * into kernel. One program in an object file can be transformed into
531 * multiple variants to be attached to different hooks.
533 * bpf_program_prep_t, bpf_program__set_prep and bpf_program__nth_fd
534 * form an API for this purpose.
536 * - bpf_program_prep_t:
537 * Defines a 'preprocessor', which is a caller defined function
538 * passed to libbpf through bpf_program__set_prep(), and will be
539 * called before program is loaded. The processor should adjust
540 * the program one time for each instance according to the instance id
543 * - bpf_program__set_prep:
544 * Attaches a preprocessor to a BPF program. The number of instances
545 * that should be created is also passed through this function.
547 * - bpf_program__nth_fd:
548 * After the program is loaded, get resulting FD of a given instance
549 * of the BPF program.
551 * If bpf_program__set_prep() is not used, the program would be loaded
552 * without adjustment during bpf_object__load(). The program has only
553 * one instance. In this case bpf_program__fd(prog) is equal to
554 * bpf_program__nth_fd(prog, 0).
556 struct bpf_prog_prep_result {
558 * If not NULL, load new instruction array.
559 * If set to NULL, don't load this instance.
561 struct bpf_insn *new_insn_ptr;
564 /* If not NULL, result FD is written to it. */
569 * Parameters of bpf_program_prep_t:
570 * - prog: The bpf_program being loaded.
571 * - n: Index of instance being generated.
572 * - insns: BPF instructions array.
573 * - insns_cnt:Number of instructions in insns.
574 * - res: Output parameter, result of transformation.
577 * - Zero: pre-processing success.
578 * - Non-zero: pre-processing error, stop loading.
580 typedef int (*bpf_program_prep_t)(struct bpf_program *prog, int n,
581 struct bpf_insn *insns, int insns_cnt,
582 struct bpf_prog_prep_result *res);
584 LIBBPF_DEPRECATED_SINCE(0, 7, "use bpf_program__insns() for getting bpf_program instructions")
585 LIBBPF_API int bpf_program__set_prep(struct bpf_program *prog, int nr_instance,
586 bpf_program_prep_t prep);
588 LIBBPF_DEPRECATED_SINCE(0, 7, "multi-instance bpf_program support is deprecated")
589 LIBBPF_API int bpf_program__nth_fd(const struct bpf_program *prog, int n);
592 * Adjust type of BPF program. Default is kprobe.
594 LIBBPF_API int bpf_program__set_socket_filter(struct bpf_program *prog);
595 LIBBPF_API int bpf_program__set_tracepoint(struct bpf_program *prog);
596 LIBBPF_API int bpf_program__set_raw_tracepoint(struct bpf_program *prog);
597 LIBBPF_API int bpf_program__set_kprobe(struct bpf_program *prog);
598 LIBBPF_API int bpf_program__set_lsm(struct bpf_program *prog);
599 LIBBPF_API int bpf_program__set_sched_cls(struct bpf_program *prog);
600 LIBBPF_API int bpf_program__set_sched_act(struct bpf_program *prog);
601 LIBBPF_API int bpf_program__set_xdp(struct bpf_program *prog);
602 LIBBPF_API int bpf_program__set_perf_event(struct bpf_program *prog);
603 LIBBPF_API int bpf_program__set_tracing(struct bpf_program *prog);
604 LIBBPF_API int bpf_program__set_struct_ops(struct bpf_program *prog);
605 LIBBPF_API int bpf_program__set_extension(struct bpf_program *prog);
606 LIBBPF_API int bpf_program__set_sk_lookup(struct bpf_program *prog);
608 LIBBPF_API enum bpf_prog_type bpf_program__get_type(const struct bpf_program *prog);
609 LIBBPF_API void bpf_program__set_type(struct bpf_program *prog,
610 enum bpf_prog_type type);
612 LIBBPF_API enum bpf_attach_type
613 bpf_program__get_expected_attach_type(const struct bpf_program *prog);
615 bpf_program__set_expected_attach_type(struct bpf_program *prog,
616 enum bpf_attach_type type);
618 LIBBPF_API __u32 bpf_program__flags(const struct bpf_program *prog);
619 LIBBPF_API int bpf_program__set_flags(struct bpf_program *prog, __u32 flags);
621 /* Per-program log level and log buffer getters/setters.
622 * See bpf_object_open_opts comments regarding log_level and log_buf
625 LIBBPF_API __u32 bpf_program__log_level(const struct bpf_program *prog);
626 LIBBPF_API int bpf_program__set_log_level(struct bpf_program *prog, __u32 log_level);
627 LIBBPF_API const char *bpf_program__log_buf(const struct bpf_program *prog, size_t *log_size);
628 LIBBPF_API int bpf_program__set_log_buf(struct bpf_program *prog, char *log_buf, size_t log_size);
631 bpf_program__set_attach_target(struct bpf_program *prog, int attach_prog_fd,
632 const char *attach_func_name);
634 LIBBPF_API bool bpf_program__is_socket_filter(const struct bpf_program *prog);
635 LIBBPF_API bool bpf_program__is_tracepoint(const struct bpf_program *prog);
636 LIBBPF_API bool bpf_program__is_raw_tracepoint(const struct bpf_program *prog);
637 LIBBPF_API bool bpf_program__is_kprobe(const struct bpf_program *prog);
638 LIBBPF_API bool bpf_program__is_lsm(const struct bpf_program *prog);
639 LIBBPF_API bool bpf_program__is_sched_cls(const struct bpf_program *prog);
640 LIBBPF_API bool bpf_program__is_sched_act(const struct bpf_program *prog);
641 LIBBPF_API bool bpf_program__is_xdp(const struct bpf_program *prog);
642 LIBBPF_API bool bpf_program__is_perf_event(const struct bpf_program *prog);
643 LIBBPF_API bool bpf_program__is_tracing(const struct bpf_program *prog);
644 LIBBPF_API bool bpf_program__is_struct_ops(const struct bpf_program *prog);
645 LIBBPF_API bool bpf_program__is_extension(const struct bpf_program *prog);
646 LIBBPF_API bool bpf_program__is_sk_lookup(const struct bpf_program *prog);
649 * No need for __attribute__((packed)), all members of 'bpf_map_def'
650 * are all aligned. In addition, using __attribute__((packed))
651 * would trigger a -Wpacked warning message, and lead to an error
656 unsigned int key_size;
657 unsigned int value_size;
658 unsigned int max_entries;
659 unsigned int map_flags;
663 * @brief **bpf_object__find_map_by_name()** returns BPF map of
664 * the given name, if it exists within the passed BPF object
665 * @param obj BPF object
666 * @param name name of the BPF map
667 * @return BPF map instance, if such map exists within the BPF object;
670 LIBBPF_API struct bpf_map *
671 bpf_object__find_map_by_name(const struct bpf_object *obj, const char *name);
674 bpf_object__find_map_fd_by_name(const struct bpf_object *obj, const char *name);
677 * Get bpf_map through the offset of corresponding struct bpf_map_def
678 * in the BPF object file.
680 LIBBPF_API LIBBPF_DEPRECATED_SINCE(0, 8, "use bpf_object__find_map_by_name() instead")
682 bpf_object__find_map_by_offset(struct bpf_object *obj, size_t offset);
684 LIBBPF_API LIBBPF_DEPRECATED_SINCE(0, 7, "use bpf_object__next_map() instead")
685 struct bpf_map *bpf_map__next(const struct bpf_map *map, const struct bpf_object *obj);
686 LIBBPF_API struct bpf_map *
687 bpf_object__next_map(const struct bpf_object *obj, const struct bpf_map *map);
689 #define bpf_object__for_each_map(pos, obj) \
690 for ((pos) = bpf_object__next_map((obj), NULL); \
692 (pos) = bpf_object__next_map((obj), (pos)))
693 #define bpf_map__for_each bpf_object__for_each_map
695 LIBBPF_API LIBBPF_DEPRECATED_SINCE(0, 7, "use bpf_object__prev_map() instead")
696 struct bpf_map *bpf_map__prev(const struct bpf_map *map, const struct bpf_object *obj);
697 LIBBPF_API struct bpf_map *
698 bpf_object__prev_map(const struct bpf_object *obj, const struct bpf_map *map);
701 * @brief **bpf_map__fd()** gets the file descriptor of the passed
703 * @param map the BPF map instance
704 * @return the file descriptor; or -EINVAL in case of an error
706 LIBBPF_API int bpf_map__fd(const struct bpf_map *map);
707 LIBBPF_API int bpf_map__reuse_fd(struct bpf_map *map, int fd);
708 /* get map definition */
709 LIBBPF_API const struct bpf_map_def *bpf_map__def(const struct bpf_map *map);
711 LIBBPF_API const char *bpf_map__name(const struct bpf_map *map);
712 /* get/set map type */
713 LIBBPF_API enum bpf_map_type bpf_map__type(const struct bpf_map *map);
714 LIBBPF_API int bpf_map__set_type(struct bpf_map *map, enum bpf_map_type type);
715 /* get/set map size (max_entries) */
716 LIBBPF_API __u32 bpf_map__max_entries(const struct bpf_map *map);
717 LIBBPF_API int bpf_map__set_max_entries(struct bpf_map *map, __u32 max_entries);
718 LIBBPF_API int bpf_map__resize(struct bpf_map *map, __u32 max_entries);
719 /* get/set map flags */
720 LIBBPF_API __u32 bpf_map__map_flags(const struct bpf_map *map);
721 LIBBPF_API int bpf_map__set_map_flags(struct bpf_map *map, __u32 flags);
722 /* get/set map NUMA node */
723 LIBBPF_API __u32 bpf_map__numa_node(const struct bpf_map *map);
724 LIBBPF_API int bpf_map__set_numa_node(struct bpf_map *map, __u32 numa_node);
725 /* get/set map key size */
726 LIBBPF_API __u32 bpf_map__key_size(const struct bpf_map *map);
727 LIBBPF_API int bpf_map__set_key_size(struct bpf_map *map, __u32 size);
728 /* get/set map value size */
729 LIBBPF_API __u32 bpf_map__value_size(const struct bpf_map *map);
730 LIBBPF_API int bpf_map__set_value_size(struct bpf_map *map, __u32 size);
731 /* get map key/value BTF type IDs */
732 LIBBPF_API __u32 bpf_map__btf_key_type_id(const struct bpf_map *map);
733 LIBBPF_API __u32 bpf_map__btf_value_type_id(const struct bpf_map *map);
734 /* get/set map if_index */
735 LIBBPF_API __u32 bpf_map__ifindex(const struct bpf_map *map);
736 LIBBPF_API int bpf_map__set_ifindex(struct bpf_map *map, __u32 ifindex);
737 /* get/set map map_extra flags */
738 LIBBPF_API __u64 bpf_map__map_extra(const struct bpf_map *map);
739 LIBBPF_API int bpf_map__set_map_extra(struct bpf_map *map, __u64 map_extra);
741 typedef void (*bpf_map_clear_priv_t)(struct bpf_map *, void *);
742 LIBBPF_API int bpf_map__set_priv(struct bpf_map *map, void *priv,
743 bpf_map_clear_priv_t clear_priv);
744 LIBBPF_API void *bpf_map__priv(const struct bpf_map *map);
745 LIBBPF_API int bpf_map__set_initial_value(struct bpf_map *map,
746 const void *data, size_t size);
747 LIBBPF_API const void *bpf_map__initial_value(struct bpf_map *map, size_t *psize);
748 LIBBPF_DEPRECATED_SINCE(0, 8, "use bpf_map__type() instead")
749 LIBBPF_API bool bpf_map__is_offload_neutral(const struct bpf_map *map);
752 * @brief **bpf_map__is_internal()** tells the caller whether or not the
753 * passed map is a special map created by libbpf automatically for things like
754 * global variables, __ksym externs, Kconfig values, etc
755 * @param map the bpf_map
756 * @return true, if the map is an internal map; false, otherwise
758 LIBBPF_API bool bpf_map__is_internal(const struct bpf_map *map);
759 LIBBPF_API int bpf_map__set_pin_path(struct bpf_map *map, const char *path);
760 LIBBPF_API const char *bpf_map__get_pin_path(const struct bpf_map *map);
761 LIBBPF_API const char *bpf_map__pin_path(const struct bpf_map *map);
762 LIBBPF_API bool bpf_map__is_pinned(const struct bpf_map *map);
763 LIBBPF_API int bpf_map__pin(struct bpf_map *map, const char *path);
764 LIBBPF_API int bpf_map__unpin(struct bpf_map *map, const char *path);
766 LIBBPF_API int bpf_map__set_inner_map_fd(struct bpf_map *map, int fd);
767 LIBBPF_API struct bpf_map *bpf_map__inner_map(struct bpf_map *map);
770 * @brief **libbpf_get_error()** extracts the error code from the passed
772 * @param ptr pointer returned from libbpf API function
773 * @return error code; or 0 if no error occured
775 * Many libbpf API functions which return pointers have logic to encode error
776 * codes as pointers, and do not return NULL. Meaning **libbpf_get_error()**
777 * should be used on the return value from these functions immediately after
778 * calling the API function, with no intervening calls that could clobber the
779 * `errno` variable. Consult the individual functions documentation to verify
780 * if this logic applies should be used.
782 * For these API functions, if `libbpf_set_strict_mode(LIBBPF_STRICT_CLEAN_PTRS)`
783 * is enabled, NULL is returned on error instead.
785 * If ptr is NULL, then errno should be already set by the failing
786 * API, because libbpf never returns NULL on success and it now always
787 * sets errno on error.
791 * struct perf_buffer *pb;
793 * pb = perf_buffer__new(bpf_map__fd(obj->maps.events), PERF_BUFFER_PAGES, &opts);
794 * err = libbpf_get_error(pb);
797 * fprintf(stderr, "failed to open perf buffer: %d\n", err);
801 LIBBPF_API long libbpf_get_error(const void *ptr);
803 struct bpf_prog_load_attr {
805 enum bpf_prog_type prog_type;
806 enum bpf_attach_type expected_attach_type;
812 LIBBPF_DEPRECATED_SINCE(0, 8, "use bpf_object__open() and bpf_object__load() instead")
813 LIBBPF_API int bpf_prog_load_xattr(const struct bpf_prog_load_attr *attr,
814 struct bpf_object **pobj, int *prog_fd);
815 LIBBPF_DEPRECATED_SINCE(0, 7, "use bpf_object__open() and bpf_object__load() instead")
816 LIBBPF_API int bpf_prog_load_deprecated(const char *file, enum bpf_prog_type type,
817 struct bpf_object **pobj, int *prog_fd);
819 /* XDP related API */
820 struct xdp_link_info {
828 struct bpf_xdp_set_link_opts {
833 #define bpf_xdp_set_link_opts__last_field old_fd
835 LIBBPF_API int bpf_set_link_xdp_fd(int ifindex, int fd, __u32 flags);
836 LIBBPF_API int bpf_set_link_xdp_fd_opts(int ifindex, int fd, __u32 flags,
837 const struct bpf_xdp_set_link_opts *opts);
838 LIBBPF_API int bpf_get_link_xdp_id(int ifindex, __u32 *prog_id, __u32 flags);
839 LIBBPF_API int bpf_get_link_xdp_info(int ifindex, struct xdp_link_info *info,
840 size_t info_size, __u32 flags);
843 enum bpf_tc_attach_point {
844 BPF_TC_INGRESS = 1 << 0,
845 BPF_TC_EGRESS = 1 << 1,
846 BPF_TC_CUSTOM = 1 << 2,
849 #define BPF_TC_PARENT(a, b) \
850 ((((a) << 16) & 0xFFFF0000U) | ((b) & 0x0000FFFFU))
853 BPF_TC_F_REPLACE = 1 << 0,
859 enum bpf_tc_attach_point attach_point;
863 #define bpf_tc_hook__last_field parent
874 #define bpf_tc_opts__last_field priority
876 LIBBPF_API int bpf_tc_hook_create(struct bpf_tc_hook *hook);
877 LIBBPF_API int bpf_tc_hook_destroy(struct bpf_tc_hook *hook);
878 LIBBPF_API int bpf_tc_attach(const struct bpf_tc_hook *hook,
879 struct bpf_tc_opts *opts);
880 LIBBPF_API int bpf_tc_detach(const struct bpf_tc_hook *hook,
881 const struct bpf_tc_opts *opts);
882 LIBBPF_API int bpf_tc_query(const struct bpf_tc_hook *hook,
883 struct bpf_tc_opts *opts);
885 /* Ring buffer APIs */
888 typedef int (*ring_buffer_sample_fn)(void *ctx, void *data, size_t size);
890 struct ring_buffer_opts {
891 size_t sz; /* size of this struct, for forward/backward compatiblity */
894 #define ring_buffer_opts__last_field sz
896 LIBBPF_API struct ring_buffer *
897 ring_buffer__new(int map_fd, ring_buffer_sample_fn sample_cb, void *ctx,
898 const struct ring_buffer_opts *opts);
899 LIBBPF_API void ring_buffer__free(struct ring_buffer *rb);
900 LIBBPF_API int ring_buffer__add(struct ring_buffer *rb, int map_fd,
901 ring_buffer_sample_fn sample_cb, void *ctx);
902 LIBBPF_API int ring_buffer__poll(struct ring_buffer *rb, int timeout_ms);
903 LIBBPF_API int ring_buffer__consume(struct ring_buffer *rb);
904 LIBBPF_API int ring_buffer__epoll_fd(const struct ring_buffer *rb);
906 /* Perf buffer APIs */
909 typedef void (*perf_buffer_sample_fn)(void *ctx, int cpu,
910 void *data, __u32 size);
911 typedef void (*perf_buffer_lost_fn)(void *ctx, int cpu, __u64 cnt);
913 /* common use perf buffer options */
914 struct perf_buffer_opts {
917 struct { /* DEPRECATED: will be removed in v1.0 */
918 /* if specified, sample_cb is called for each sample */
919 perf_buffer_sample_fn sample_cb;
920 /* if specified, lost_cb is called for each batch of lost samples */
921 perf_buffer_lost_fn lost_cb;
922 /* ctx is provided to sample_cb and lost_cb */
927 #define perf_buffer_opts__last_field sz
930 * @brief **perf_buffer__new()** creates BPF perfbuf manager for a specified
931 * BPF_PERF_EVENT_ARRAY map
932 * @param map_fd FD of BPF_PERF_EVENT_ARRAY BPF map that will be used by BPF
933 * code to send data over to user-space
934 * @param page_cnt number of memory pages allocated for each per-CPU buffer
935 * @param sample_cb function called on each received data record
936 * @param lost_cb function called when record loss has occurred
937 * @param ctx user-provided extra context passed into *sample_cb* and *lost_cb*
938 * @return a new instance of struct perf_buffer on success, NULL on error with
939 * *errno* containing an error code
941 LIBBPF_API struct perf_buffer *
942 perf_buffer__new(int map_fd, size_t page_cnt,
943 perf_buffer_sample_fn sample_cb, perf_buffer_lost_fn lost_cb, void *ctx,
944 const struct perf_buffer_opts *opts);
946 LIBBPF_API struct perf_buffer *
947 perf_buffer__new_v0_6_0(int map_fd, size_t page_cnt,
948 perf_buffer_sample_fn sample_cb, perf_buffer_lost_fn lost_cb, void *ctx,
949 const struct perf_buffer_opts *opts);
951 LIBBPF_API LIBBPF_DEPRECATED_SINCE(0, 7, "use new variant of perf_buffer__new() instead")
952 struct perf_buffer *perf_buffer__new_deprecated(int map_fd, size_t page_cnt,
953 const struct perf_buffer_opts *opts);
955 #define perf_buffer__new(...) ___libbpf_overload(___perf_buffer_new, __VA_ARGS__)
956 #define ___perf_buffer_new6(map_fd, page_cnt, sample_cb, lost_cb, ctx, opts) \
957 perf_buffer__new(map_fd, page_cnt, sample_cb, lost_cb, ctx, opts)
958 #define ___perf_buffer_new3(map_fd, page_cnt, opts) \
959 perf_buffer__new_deprecated(map_fd, page_cnt, opts)
961 enum bpf_perf_event_ret {
962 LIBBPF_PERF_EVENT_DONE = 0,
963 LIBBPF_PERF_EVENT_ERROR = -1,
964 LIBBPF_PERF_EVENT_CONT = -2,
967 struct perf_event_header;
969 typedef enum bpf_perf_event_ret
970 (*perf_buffer_event_fn)(void *ctx, int cpu, struct perf_event_header *event);
972 /* raw perf buffer options, giving most power and control */
973 struct perf_buffer_raw_opts {
980 struct { /* DEPRECATED: will be removed in v1.0 */
981 /* perf event attrs passed directly into perf_event_open() */
982 struct perf_event_attr *attr;
983 /* raw event callback */
984 perf_buffer_event_fn event_cb;
985 /* ctx is provided to event_cb */
989 /* if cpu_cnt == 0, open all on all possible CPUs (up to the number of
990 * max_entries of given PERF_EVENT_ARRAY map)
993 /* if cpu_cnt > 0, cpus is an array of CPUs to open ring buffers on */
995 /* if cpu_cnt > 0, map_keys specify map keys to set per-CPU FDs for */
998 #define perf_buffer_raw_opts__last_field map_keys
1000 LIBBPF_API struct perf_buffer *
1001 perf_buffer__new_raw(int map_fd, size_t page_cnt, struct perf_event_attr *attr,
1002 perf_buffer_event_fn event_cb, void *ctx,
1003 const struct perf_buffer_raw_opts *opts);
1005 LIBBPF_API struct perf_buffer *
1006 perf_buffer__new_raw_v0_6_0(int map_fd, size_t page_cnt, struct perf_event_attr *attr,
1007 perf_buffer_event_fn event_cb, void *ctx,
1008 const struct perf_buffer_raw_opts *opts);
1010 LIBBPF_API LIBBPF_DEPRECATED_SINCE(0, 7, "use new variant of perf_buffer__new_raw() instead")
1011 struct perf_buffer *perf_buffer__new_raw_deprecated(int map_fd, size_t page_cnt,
1012 const struct perf_buffer_raw_opts *opts);
1014 #define perf_buffer__new_raw(...) ___libbpf_overload(___perf_buffer_new_raw, __VA_ARGS__)
1015 #define ___perf_buffer_new_raw6(map_fd, page_cnt, attr, event_cb, ctx, opts) \
1016 perf_buffer__new_raw(map_fd, page_cnt, attr, event_cb, ctx, opts)
1017 #define ___perf_buffer_new_raw3(map_fd, page_cnt, opts) \
1018 perf_buffer__new_raw_deprecated(map_fd, page_cnt, opts)
1020 LIBBPF_API void perf_buffer__free(struct perf_buffer *pb);
1021 LIBBPF_API int perf_buffer__epoll_fd(const struct perf_buffer *pb);
1022 LIBBPF_API int perf_buffer__poll(struct perf_buffer *pb, int timeout_ms);
1023 LIBBPF_API int perf_buffer__consume(struct perf_buffer *pb);
1024 LIBBPF_API int perf_buffer__consume_buffer(struct perf_buffer *pb, size_t buf_idx);
1025 LIBBPF_API size_t perf_buffer__buffer_cnt(const struct perf_buffer *pb);
1026 LIBBPF_API int perf_buffer__buffer_fd(const struct perf_buffer *pb, size_t buf_idx);
1028 typedef enum bpf_perf_event_ret
1029 (*bpf_perf_event_print_t)(struct perf_event_header *hdr,
1030 void *private_data);
1031 LIBBPF_DEPRECATED_SINCE(0, 8, "use perf_buffer__poll() or perf_buffer__consume() instead")
1032 LIBBPF_API enum bpf_perf_event_ret
1033 bpf_perf_event_read_simple(void *mmap_mem, size_t mmap_size, size_t page_size,
1034 void **copy_mem, size_t *copy_size,
1035 bpf_perf_event_print_t fn, void *private_data);
1037 struct bpf_prog_linfo;
1038 struct bpf_prog_info;
1040 LIBBPF_API void bpf_prog_linfo__free(struct bpf_prog_linfo *prog_linfo);
1041 LIBBPF_API struct bpf_prog_linfo *
1042 bpf_prog_linfo__new(const struct bpf_prog_info *info);
1043 LIBBPF_API const struct bpf_line_info *
1044 bpf_prog_linfo__lfind_addr_func(const struct bpf_prog_linfo *prog_linfo,
1045 __u64 addr, __u32 func_idx, __u32 nr_skip);
1046 LIBBPF_API const struct bpf_line_info *
1047 bpf_prog_linfo__lfind(const struct bpf_prog_linfo *prog_linfo,
1048 __u32 insn_off, __u32 nr_skip);
1051 * Probe for supported system features
1053 * Note that running many of these probes in a short amount of time can cause
1054 * the kernel to reach the maximal size of lockable memory allowed for the
1055 * user, causing subsequent probes to fail. In this case, the caller may want
1056 * to adjust that limit with setrlimit().
1058 LIBBPF_DEPRECATED_SINCE(0, 8, "use libbpf_probe_bpf_prog_type() instead")
1059 LIBBPF_API bool bpf_probe_prog_type(enum bpf_prog_type prog_type, __u32 ifindex);
1060 LIBBPF_DEPRECATED_SINCE(0, 8, "use libbpf_probe_bpf_map_type() instead")
1061 LIBBPF_API bool bpf_probe_map_type(enum bpf_map_type map_type, __u32 ifindex);
1062 LIBBPF_DEPRECATED_SINCE(0, 8, "use libbpf_probe_bpf_helper() instead")
1063 LIBBPF_API bool bpf_probe_helper(enum bpf_func_id id, enum bpf_prog_type prog_type, __u32 ifindex);
1064 LIBBPF_DEPRECATED_SINCE(0, 8, "implement your own or use bpftool for feature detection")
1065 LIBBPF_API bool bpf_probe_large_insn_limit(__u32 ifindex);
1068 * @brief **libbpf_probe_bpf_prog_type()** detects if host kernel supports
1069 * BPF programs of a given type.
1070 * @param prog_type BPF program type to detect kernel support for
1071 * @param opts reserved for future extensibility, should be NULL
1072 * @return 1, if given program type is supported; 0, if given program type is
1073 * not supported; negative error code if feature detection failed or can't be
1076 * Make sure the process has required set of CAP_* permissions (or runs as
1077 * root) when performing feature checking.
1079 LIBBPF_API int libbpf_probe_bpf_prog_type(enum bpf_prog_type prog_type, const void *opts);
1081 * @brief **libbpf_probe_bpf_map_type()** detects if host kernel supports
1082 * BPF maps of a given type.
1083 * @param map_type BPF map type to detect kernel support for
1084 * @param opts reserved for future extensibility, should be NULL
1085 * @return 1, if given map type is supported; 0, if given map type is
1086 * not supported; negative error code if feature detection failed or can't be
1089 * Make sure the process has required set of CAP_* permissions (or runs as
1090 * root) when performing feature checking.
1092 LIBBPF_API int libbpf_probe_bpf_map_type(enum bpf_map_type map_type, const void *opts);
1094 * @brief **libbpf_probe_bpf_helper()** detects if host kernel supports the
1095 * use of a given BPF helper from specified BPF program type.
1096 * @param prog_type BPF program type used to check the support of BPF helper
1097 * @param helper_id BPF helper ID (enum bpf_func_id) to check support for
1098 * @param opts reserved for future extensibility, should be NULL
1099 * @return 1, if given combination of program type and helper is supported; 0,
1100 * if the combination is not supported; negative error code if feature
1101 * detection for provided input arguments failed or can't be performed
1103 * Make sure the process has required set of CAP_* permissions (or runs as
1104 * root) when performing feature checking.
1106 LIBBPF_API int libbpf_probe_bpf_helper(enum bpf_prog_type prog_type,
1107 enum bpf_func_id helper_id, const void *opts);
1110 * Get bpf_prog_info in continuous memory
1112 * struct bpf_prog_info has multiple arrays. The user has option to choose
1113 * arrays to fetch from kernel. The following APIs provide an uniform way to
1114 * fetch these data. All arrays in bpf_prog_info are stored in a single
1115 * continuous memory region. This makes it easy to store the info in a
1118 * Before writing bpf_prog_info_linear to files, it is necessary to
1119 * translate pointers in bpf_prog_info to offsets. Helper functions
1120 * bpf_program__bpil_addr_to_offs() and bpf_program__bpil_offs_to_addr()
1121 * are introduced to switch between pointers and offsets.
1124 * # To fetch map_ids and prog_tags:
1125 * __u64 arrays = (1UL << BPF_PROG_INFO_MAP_IDS) |
1126 * (1UL << BPF_PROG_INFO_PROG_TAGS);
1127 * struct bpf_prog_info_linear *info_linear =
1128 * bpf_program__get_prog_info_linear(fd, arrays);
1130 * # To save data in file
1131 * bpf_program__bpil_addr_to_offs(info_linear);
1132 * write(f, info_linear, sizeof(*info_linear) + info_linear->data_len);
1134 * # To read data from file
1135 * read(f, info_linear, <proper_size>);
1136 * bpf_program__bpil_offs_to_addr(info_linear);
1138 enum bpf_prog_info_array {
1139 BPF_PROG_INFO_FIRST_ARRAY = 0,
1140 BPF_PROG_INFO_JITED_INSNS = 0,
1141 BPF_PROG_INFO_XLATED_INSNS,
1142 BPF_PROG_INFO_MAP_IDS,
1143 BPF_PROG_INFO_JITED_KSYMS,
1144 BPF_PROG_INFO_JITED_FUNC_LENS,
1145 BPF_PROG_INFO_FUNC_INFO,
1146 BPF_PROG_INFO_LINE_INFO,
1147 BPF_PROG_INFO_JITED_LINE_INFO,
1148 BPF_PROG_INFO_PROG_TAGS,
1149 BPF_PROG_INFO_LAST_ARRAY,
1152 struct bpf_prog_info_linear {
1153 /* size of struct bpf_prog_info, when the tool is compiled */
1155 /* total bytes allocated for data, round up to 8 bytes */
1157 /* which arrays are included in data */
1159 struct bpf_prog_info info;
1163 LIBBPF_DEPRECATED_SINCE(0, 6, "use a custom linear prog_info wrapper")
1164 LIBBPF_API struct bpf_prog_info_linear *
1165 bpf_program__get_prog_info_linear(int fd, __u64 arrays);
1167 LIBBPF_DEPRECATED_SINCE(0, 6, "use a custom linear prog_info wrapper")
1169 bpf_program__bpil_addr_to_offs(struct bpf_prog_info_linear *info_linear);
1171 LIBBPF_DEPRECATED_SINCE(0, 6, "use a custom linear prog_info wrapper")
1173 bpf_program__bpil_offs_to_addr(struct bpf_prog_info_linear *info_linear);
1176 * @brief **libbpf_num_possible_cpus()** is a helper function to get the
1177 * number of possible CPUs that the host kernel supports and expects.
1178 * @return number of possible CPUs; or error code on failure
1182 * int ncpus = libbpf_num_possible_cpus();
1186 * long values[ncpus];
1187 * bpf_map_lookup_elem(per_cpu_map_fd, key, values);
1189 LIBBPF_API int libbpf_num_possible_cpus(void);
1191 struct bpf_map_skeleton {
1193 struct bpf_map **map;
1197 struct bpf_prog_skeleton {
1199 struct bpf_program **prog;
1200 struct bpf_link **link;
1203 struct bpf_object_skeleton {
1204 size_t sz; /* size of this struct, for forward/backward compatibility */
1210 struct bpf_object **obj;
1213 int map_skel_sz; /* sizeof(struct bpf_map_skeleton) */
1214 struct bpf_map_skeleton *maps;
1217 int prog_skel_sz; /* sizeof(struct bpf_prog_skeleton) */
1218 struct bpf_prog_skeleton *progs;
1222 bpf_object__open_skeleton(struct bpf_object_skeleton *s,
1223 const struct bpf_object_open_opts *opts);
1224 LIBBPF_API int bpf_object__load_skeleton(struct bpf_object_skeleton *s);
1225 LIBBPF_API int bpf_object__attach_skeleton(struct bpf_object_skeleton *s);
1226 LIBBPF_API void bpf_object__detach_skeleton(struct bpf_object_skeleton *s);
1227 LIBBPF_API void bpf_object__destroy_skeleton(struct bpf_object_skeleton *s);
1229 struct gen_loader_opts {
1230 size_t sz; /* size of this struct, for forward/backward compatiblity */
1237 #define gen_loader_opts__last_field insns_sz
1238 LIBBPF_API int bpf_object__gen_loader(struct bpf_object *obj,
1239 struct gen_loader_opts *opts);
1241 enum libbpf_tristate {
1247 struct bpf_linker_opts {
1248 /* size of this struct, for forward/backward compatiblity */
1251 #define bpf_linker_opts__last_field sz
1253 struct bpf_linker_file_opts {
1254 /* size of this struct, for forward/backward compatiblity */
1257 #define bpf_linker_file_opts__last_field sz
1261 LIBBPF_API struct bpf_linker *bpf_linker__new(const char *filename, struct bpf_linker_opts *opts);
1262 LIBBPF_API int bpf_linker__add_file(struct bpf_linker *linker,
1263 const char *filename,
1264 const struct bpf_linker_file_opts *opts);
1265 LIBBPF_API int bpf_linker__finalize(struct bpf_linker *linker);
1266 LIBBPF_API void bpf_linker__free(struct bpf_linker *linker);
1272 #endif /* __LIBBPF_LIBBPF_H */