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>
25 #define LIBBPF_API __attribute__((visibility("default")))
29 __LIBBPF_ERRNO__START = 4000,
31 /* Something wrong in libelf */
32 LIBBPF_ERRNO__LIBELF = __LIBBPF_ERRNO__START,
33 LIBBPF_ERRNO__FORMAT, /* BPF object format invalid */
34 LIBBPF_ERRNO__KVERSION, /* Incorrect or no 'version' section */
35 LIBBPF_ERRNO__ENDIAN, /* Endian mismatch */
36 LIBBPF_ERRNO__INTERNAL, /* Internal error in libbpf */
37 LIBBPF_ERRNO__RELOC, /* Relocation failed */
38 LIBBPF_ERRNO__LOAD, /* Load program failure for unknown reason */
39 LIBBPF_ERRNO__VERIFY, /* Kernel verifier blocks program loading */
40 LIBBPF_ERRNO__PROG2BIG, /* Program too big */
41 LIBBPF_ERRNO__KVER, /* Incorrect kernel version */
42 LIBBPF_ERRNO__PROGTYPE, /* Kernel doesn't support this program type */
43 LIBBPF_ERRNO__WRNGPID, /* Wrong pid in netlink message */
44 LIBBPF_ERRNO__INVSEQ, /* Invalid netlink sequence */
45 LIBBPF_ERRNO__NLPARSE, /* netlink parsing error */
49 LIBBPF_API int libbpf_strerror(int err, char *buf, size_t size);
51 enum libbpf_print_level {
57 typedef int (*libbpf_print_fn_t)(enum libbpf_print_level level,
58 const char *, va_list ap);
60 LIBBPF_API void libbpf_set_print(libbpf_print_fn_t fn);
62 /* Hide internal to user */
65 struct bpf_object_open_attr {
67 enum bpf_prog_type prog_type;
70 LIBBPF_API struct bpf_object *bpf_object__open(const char *path);
71 LIBBPF_API struct bpf_object *
72 bpf_object__open_xattr(struct bpf_object_open_attr *attr);
73 struct bpf_object *__bpf_object__open_xattr(struct bpf_object_open_attr *attr,
75 LIBBPF_API struct bpf_object *bpf_object__open_buffer(void *obj_buf,
78 int bpf_object__section_size(const struct bpf_object *obj, const char *name,
80 int bpf_object__variable_offset(const struct bpf_object *obj, const char *name,
82 LIBBPF_API int bpf_object__pin_maps(struct bpf_object *obj, const char *path);
83 LIBBPF_API int bpf_object__unpin_maps(struct bpf_object *obj,
85 LIBBPF_API int bpf_object__pin_programs(struct bpf_object *obj,
87 LIBBPF_API int bpf_object__unpin_programs(struct bpf_object *obj,
89 LIBBPF_API int bpf_object__pin(struct bpf_object *object, const char *path);
90 LIBBPF_API void bpf_object__close(struct bpf_object *object);
92 /* Load/unload object into/from kernel */
93 LIBBPF_API int bpf_object__load(struct bpf_object *obj);
94 LIBBPF_API int bpf_object__unload(struct bpf_object *obj);
95 LIBBPF_API const char *bpf_object__name(struct bpf_object *obj);
96 LIBBPF_API unsigned int bpf_object__kversion(struct bpf_object *obj);
99 LIBBPF_API struct btf *bpf_object__btf(struct bpf_object *obj);
100 LIBBPF_API int bpf_object__btf_fd(const struct bpf_object *obj);
102 LIBBPF_API struct bpf_program *
103 bpf_object__find_program_by_title(struct bpf_object *obj, const char *title);
105 LIBBPF_API struct bpf_object *bpf_object__next(struct bpf_object *prev);
106 #define bpf_object__for_each_safe(pos, tmp) \
107 for ((pos) = bpf_object__next(NULL), \
108 (tmp) = bpf_object__next(pos); \
110 (pos) = (tmp), (tmp) = bpf_object__next(tmp))
112 typedef void (*bpf_object_clear_priv_t)(struct bpf_object *, void *);
113 LIBBPF_API int bpf_object__set_priv(struct bpf_object *obj, void *priv,
114 bpf_object_clear_priv_t clear_priv);
115 LIBBPF_API void *bpf_object__priv(struct bpf_object *prog);
118 libbpf_prog_type_by_name(const char *name, enum bpf_prog_type *prog_type,
119 enum bpf_attach_type *expected_attach_type);
120 LIBBPF_API int libbpf_attach_type_by_name(const char *name,
121 enum bpf_attach_type *attach_type);
123 /* Accessors of bpf_program */
125 LIBBPF_API struct bpf_program *bpf_program__next(struct bpf_program *prog,
126 struct bpf_object *obj);
128 #define bpf_object__for_each_program(pos, obj) \
129 for ((pos) = bpf_program__next(NULL, (obj)); \
131 (pos) = bpf_program__next((pos), (obj)))
133 LIBBPF_API struct bpf_program *bpf_program__prev(struct bpf_program *prog,
134 struct bpf_object *obj);
136 typedef void (*bpf_program_clear_priv_t)(struct bpf_program *,
139 LIBBPF_API int bpf_program__set_priv(struct bpf_program *prog, void *priv,
140 bpf_program_clear_priv_t clear_priv);
142 LIBBPF_API void *bpf_program__priv(struct bpf_program *prog);
143 LIBBPF_API void bpf_program__set_ifindex(struct bpf_program *prog,
146 LIBBPF_API const char *bpf_program__title(struct bpf_program *prog,
149 LIBBPF_API int bpf_program__load(struct bpf_program *prog, char *license,
151 LIBBPF_API int bpf_program__fd(struct bpf_program *prog);
152 LIBBPF_API int bpf_program__pin_instance(struct bpf_program *prog,
155 LIBBPF_API int bpf_program__unpin_instance(struct bpf_program *prog,
158 LIBBPF_API int bpf_program__pin(struct bpf_program *prog, const char *path);
159 LIBBPF_API int bpf_program__unpin(struct bpf_program *prog, const char *path);
160 LIBBPF_API void bpf_program__unload(struct bpf_program *prog);
165 * Libbpf allows callers to adjust BPF programs before being loaded
166 * into kernel. One program in an object file can be transformed into
167 * multiple variants to be attached to different hooks.
169 * bpf_program_prep_t, bpf_program__set_prep and bpf_program__nth_fd
170 * form an API for this purpose.
172 * - bpf_program_prep_t:
173 * Defines a 'preprocessor', which is a caller defined function
174 * passed to libbpf through bpf_program__set_prep(), and will be
175 * called before program is loaded. The processor should adjust
176 * the program one time for each instance according to the instance id
179 * - bpf_program__set_prep:
180 * Attaches a preprocessor to a BPF program. The number of instances
181 * that should be created is also passed through this function.
183 * - bpf_program__nth_fd:
184 * After the program is loaded, get resulting FD of a given instance
185 * of the BPF program.
187 * If bpf_program__set_prep() is not used, the program would be loaded
188 * without adjustment during bpf_object__load(). The program has only
189 * one instance. In this case bpf_program__fd(prog) is equal to
190 * bpf_program__nth_fd(prog, 0).
193 struct bpf_prog_prep_result {
195 * If not NULL, load new instruction array.
196 * If set to NULL, don't load this instance.
198 struct bpf_insn *new_insn_ptr;
201 /* If not NULL, result FD is written to it. */
206 * Parameters of bpf_program_prep_t:
207 * - prog: The bpf_program being loaded.
208 * - n: Index of instance being generated.
209 * - insns: BPF instructions array.
210 * - insns_cnt:Number of instructions in insns.
211 * - res: Output parameter, result of transformation.
214 * - Zero: pre-processing success.
215 * - Non-zero: pre-processing error, stop loading.
217 typedef int (*bpf_program_prep_t)(struct bpf_program *prog, int n,
218 struct bpf_insn *insns, int insns_cnt,
219 struct bpf_prog_prep_result *res);
221 LIBBPF_API int bpf_program__set_prep(struct bpf_program *prog, int nr_instance,
222 bpf_program_prep_t prep);
224 LIBBPF_API int bpf_program__nth_fd(struct bpf_program *prog, int n);
227 * Adjust type of BPF program. Default is kprobe.
229 LIBBPF_API int bpf_program__set_socket_filter(struct bpf_program *prog);
230 LIBBPF_API int bpf_program__set_tracepoint(struct bpf_program *prog);
231 LIBBPF_API int bpf_program__set_raw_tracepoint(struct bpf_program *prog);
232 LIBBPF_API int bpf_program__set_kprobe(struct bpf_program *prog);
233 LIBBPF_API int bpf_program__set_sched_cls(struct bpf_program *prog);
234 LIBBPF_API int bpf_program__set_sched_act(struct bpf_program *prog);
235 LIBBPF_API int bpf_program__set_xdp(struct bpf_program *prog);
236 LIBBPF_API int bpf_program__set_perf_event(struct bpf_program *prog);
237 LIBBPF_API void bpf_program__set_type(struct bpf_program *prog,
238 enum bpf_prog_type type);
240 bpf_program__set_expected_attach_type(struct bpf_program *prog,
241 enum bpf_attach_type type);
243 LIBBPF_API bool bpf_program__is_socket_filter(struct bpf_program *prog);
244 LIBBPF_API bool bpf_program__is_tracepoint(struct bpf_program *prog);
245 LIBBPF_API bool bpf_program__is_raw_tracepoint(struct bpf_program *prog);
246 LIBBPF_API bool bpf_program__is_kprobe(struct bpf_program *prog);
247 LIBBPF_API bool bpf_program__is_sched_cls(struct bpf_program *prog);
248 LIBBPF_API bool bpf_program__is_sched_act(struct bpf_program *prog);
249 LIBBPF_API bool bpf_program__is_xdp(struct bpf_program *prog);
250 LIBBPF_API bool bpf_program__is_perf_event(struct bpf_program *prog);
253 * No need for __attribute__((packed)), all members of 'bpf_map_def'
254 * are all aligned. In addition, using __attribute__((packed))
255 * would trigger a -Wpacked warning message, and lead to an error
260 unsigned int key_size;
261 unsigned int value_size;
262 unsigned int max_entries;
263 unsigned int map_flags;
267 * The 'struct bpf_map' in include/linux/bpf.h is internal to the kernel,
268 * so no need to worry about a name clash.
271 LIBBPF_API struct bpf_map *
272 bpf_object__find_map_by_name(struct bpf_object *obj, const char *name);
275 bpf_object__find_map_fd_by_name(struct bpf_object *obj, const char *name);
278 * Get bpf_map through the offset of corresponding struct bpf_map_def
279 * in the BPF object file.
281 LIBBPF_API struct bpf_map *
282 bpf_object__find_map_by_offset(struct bpf_object *obj, size_t offset);
284 LIBBPF_API struct bpf_map *
285 bpf_map__next(struct bpf_map *map, struct bpf_object *obj);
286 #define bpf_object__for_each_map(pos, obj) \
287 for ((pos) = bpf_map__next(NULL, (obj)); \
289 (pos) = bpf_map__next((pos), (obj)))
290 #define bpf_map__for_each bpf_object__for_each_map
292 LIBBPF_API struct bpf_map *
293 bpf_map__prev(struct bpf_map *map, struct bpf_object *obj);
295 LIBBPF_API int bpf_map__fd(struct bpf_map *map);
296 LIBBPF_API const struct bpf_map_def *bpf_map__def(struct bpf_map *map);
297 LIBBPF_API const char *bpf_map__name(struct bpf_map *map);
298 LIBBPF_API __u32 bpf_map__btf_key_type_id(const struct bpf_map *map);
299 LIBBPF_API __u32 bpf_map__btf_value_type_id(const struct bpf_map *map);
301 typedef void (*bpf_map_clear_priv_t)(struct bpf_map *, void *);
302 LIBBPF_API int bpf_map__set_priv(struct bpf_map *map, void *priv,
303 bpf_map_clear_priv_t clear_priv);
304 LIBBPF_API void *bpf_map__priv(struct bpf_map *map);
305 LIBBPF_API int bpf_map__reuse_fd(struct bpf_map *map, int fd);
306 LIBBPF_API int bpf_map__resize(struct bpf_map *map, __u32 max_entries);
307 LIBBPF_API bool bpf_map__is_offload_neutral(struct bpf_map *map);
308 LIBBPF_API bool bpf_map__is_internal(struct bpf_map *map);
309 LIBBPF_API void bpf_map__set_ifindex(struct bpf_map *map, __u32 ifindex);
310 LIBBPF_API int bpf_map__pin(struct bpf_map *map, const char *path);
311 LIBBPF_API int bpf_map__unpin(struct bpf_map *map, const char *path);
313 LIBBPF_API int bpf_map__set_inner_map_fd(struct bpf_map *map, int fd);
315 LIBBPF_API long libbpf_get_error(const void *ptr);
317 struct bpf_prog_load_attr {
319 enum bpf_prog_type prog_type;
320 enum bpf_attach_type expected_attach_type;
325 LIBBPF_API int bpf_prog_load_xattr(const struct bpf_prog_load_attr *attr,
326 struct bpf_object **pobj, int *prog_fd);
327 LIBBPF_API int bpf_prog_load(const char *file, enum bpf_prog_type type,
328 struct bpf_object **pobj, int *prog_fd);
330 LIBBPF_API int bpf_set_link_xdp_fd(int ifindex, int fd, __u32 flags);
331 LIBBPF_API int bpf_get_link_xdp_id(int ifindex, __u32 *prog_id, __u32 flags);
333 enum bpf_perf_event_ret {
334 LIBBPF_PERF_EVENT_DONE = 0,
335 LIBBPF_PERF_EVENT_ERROR = -1,
336 LIBBPF_PERF_EVENT_CONT = -2,
339 struct perf_event_header;
340 typedef enum bpf_perf_event_ret
341 (*bpf_perf_event_print_t)(struct perf_event_header *hdr,
343 LIBBPF_API enum bpf_perf_event_ret
344 bpf_perf_event_read_simple(void *mmap_mem, size_t mmap_size, size_t page_size,
345 void **copy_mem, size_t *copy_size,
346 bpf_perf_event_print_t fn, void *private_data);
349 typedef int (*libbpf_dump_nlmsg_t)(void *cookie, void *msg, struct nlattr **tb);
350 int libbpf_netlink_open(unsigned int *nl_pid);
351 int libbpf_nl_get_link(int sock, unsigned int nl_pid,
352 libbpf_dump_nlmsg_t dump_link_nlmsg, void *cookie);
353 int libbpf_nl_get_class(int sock, unsigned int nl_pid, int ifindex,
354 libbpf_dump_nlmsg_t dump_class_nlmsg, void *cookie);
355 int libbpf_nl_get_qdisc(int sock, unsigned int nl_pid, int ifindex,
356 libbpf_dump_nlmsg_t dump_qdisc_nlmsg, void *cookie);
357 int libbpf_nl_get_filter(int sock, unsigned int nl_pid, int ifindex, int handle,
358 libbpf_dump_nlmsg_t dump_filter_nlmsg, void *cookie);
360 struct bpf_prog_linfo;
361 struct bpf_prog_info;
363 LIBBPF_API void bpf_prog_linfo__free(struct bpf_prog_linfo *prog_linfo);
364 LIBBPF_API struct bpf_prog_linfo *
365 bpf_prog_linfo__new(const struct bpf_prog_info *info);
366 LIBBPF_API const struct bpf_line_info *
367 bpf_prog_linfo__lfind_addr_func(const struct bpf_prog_linfo *prog_linfo,
368 __u64 addr, __u32 func_idx, __u32 nr_skip);
369 LIBBPF_API const struct bpf_line_info *
370 bpf_prog_linfo__lfind(const struct bpf_prog_linfo *prog_linfo,
371 __u32 insn_off, __u32 nr_skip);
374 * Probe for supported system features
376 * Note that running many of these probes in a short amount of time can cause
377 * the kernel to reach the maximal size of lockable memory allowed for the
378 * user, causing subsequent probes to fail. In this case, the caller may want
379 * to adjust that limit with setrlimit().
381 LIBBPF_API bool bpf_probe_prog_type(enum bpf_prog_type prog_type,
383 LIBBPF_API bool bpf_probe_map_type(enum bpf_map_type map_type, __u32 ifindex);
384 LIBBPF_API bool bpf_probe_helper(enum bpf_func_id id,
385 enum bpf_prog_type prog_type, __u32 ifindex);
388 * Get bpf_prog_info in continuous memory
390 * struct bpf_prog_info has multiple arrays. The user has option to choose
391 * arrays to fetch from kernel. The following APIs provide an uniform way to
392 * fetch these data. All arrays in bpf_prog_info are stored in a single
393 * continuous memory region. This makes it easy to store the info in a
396 * Before writing bpf_prog_info_linear to files, it is necessary to
397 * translate pointers in bpf_prog_info to offsets. Helper functions
398 * bpf_program__bpil_addr_to_offs() and bpf_program__bpil_offs_to_addr()
399 * are introduced to switch between pointers and offsets.
402 * # To fetch map_ids and prog_tags:
403 * __u64 arrays = (1UL << BPF_PROG_INFO_MAP_IDS) |
404 * (1UL << BPF_PROG_INFO_PROG_TAGS);
405 * struct bpf_prog_info_linear *info_linear =
406 * bpf_program__get_prog_info_linear(fd, arrays);
408 * # To save data in file
409 * bpf_program__bpil_addr_to_offs(info_linear);
410 * write(f, info_linear, sizeof(*info_linear) + info_linear->data_len);
412 * # To read data from file
413 * read(f, info_linear, <proper_size>);
414 * bpf_program__bpil_offs_to_addr(info_linear);
416 enum bpf_prog_info_array {
417 BPF_PROG_INFO_FIRST_ARRAY = 0,
418 BPF_PROG_INFO_JITED_INSNS = 0,
419 BPF_PROG_INFO_XLATED_INSNS,
420 BPF_PROG_INFO_MAP_IDS,
421 BPF_PROG_INFO_JITED_KSYMS,
422 BPF_PROG_INFO_JITED_FUNC_LENS,
423 BPF_PROG_INFO_FUNC_INFO,
424 BPF_PROG_INFO_LINE_INFO,
425 BPF_PROG_INFO_JITED_LINE_INFO,
426 BPF_PROG_INFO_PROG_TAGS,
427 BPF_PROG_INFO_LAST_ARRAY,
430 struct bpf_prog_info_linear {
431 /* size of struct bpf_prog_info, when the tool is compiled */
433 /* total bytes allocated for data, round up to 8 bytes */
435 /* which arrays are included in data */
437 struct bpf_prog_info info;
441 LIBBPF_API struct bpf_prog_info_linear *
442 bpf_program__get_prog_info_linear(int fd, __u64 arrays);
445 bpf_program__bpil_addr_to_offs(struct bpf_prog_info_linear *info_linear);
448 bpf_program__bpil_offs_to_addr(struct bpf_prog_info_linear *info_linear);
454 #endif /* __LIBBPF_LIBBPF_H */