1 /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */ 2 3 /* 4 * Common eBPF ELF object loading operations. 5 * 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. 9 */ 10 #ifndef __LIBBPF_LIBBPF_H 11 #define __LIBBPF_LIBBPF_H 12 13 #include <stdarg.h> 14 #include <stdio.h> 15 #include <stdint.h> 16 #include <stdbool.h> 17 #include <sys/types.h> // for size_t 18 #include <linux/bpf.h> 19 20 #include "libbpf_common.h" 21 22 #ifdef __cplusplus 23 extern "C" { 24 #endif 25 26 enum libbpf_errno { 27 __LIBBPF_ERRNO__START = 4000, 28 29 /* Something wrong in libelf */ 30 LIBBPF_ERRNO__LIBELF = __LIBBPF_ERRNO__START, 31 LIBBPF_ERRNO__FORMAT, /* BPF object format invalid */ 32 LIBBPF_ERRNO__KVERSION, /* Incorrect or no 'version' section */ 33 LIBBPF_ERRNO__ENDIAN, /* Endian mismatch */ 34 LIBBPF_ERRNO__INTERNAL, /* Internal error in libbpf */ 35 LIBBPF_ERRNO__RELOC, /* Relocation failed */ 36 LIBBPF_ERRNO__LOAD, /* Load program failure for unknown reason */ 37 LIBBPF_ERRNO__VERIFY, /* Kernel verifier blocks program loading */ 38 LIBBPF_ERRNO__PROG2BIG, /* Program too big */ 39 LIBBPF_ERRNO__KVER, /* Incorrect kernel version */ 40 LIBBPF_ERRNO__PROGTYPE, /* Kernel doesn't support this program type */ 41 LIBBPF_ERRNO__WRNGPID, /* Wrong pid in netlink message */ 42 LIBBPF_ERRNO__INVSEQ, /* Invalid netlink sequence */ 43 LIBBPF_ERRNO__NLPARSE, /* netlink parsing error */ 44 __LIBBPF_ERRNO__END, 45 }; 46 47 LIBBPF_API int libbpf_strerror(int err, char *buf, size_t size); 48 49 enum libbpf_print_level { 50 LIBBPF_WARN, 51 LIBBPF_INFO, 52 LIBBPF_DEBUG, 53 }; 54 55 typedef int (*libbpf_print_fn_t)(enum libbpf_print_level level, 56 const char *, va_list ap); 57 58 LIBBPF_API libbpf_print_fn_t libbpf_set_print(libbpf_print_fn_t fn); 59 60 /* Hide internal to user */ 61 struct bpf_object; 62 63 struct bpf_object_open_attr { 64 const char *file; 65 enum bpf_prog_type prog_type; 66 }; 67 68 struct bpf_object_open_opts { 69 /* size of this struct, for forward/backward compatiblity */ 70 size_t sz; 71 /* object name override, if provided: 72 * - for object open from file, this will override setting object 73 * name from file path's base name; 74 * - for object open from memory buffer, this will specify an object 75 * name and will override default "<addr>-<buf-size>" name; 76 */ 77 const char *object_name; 78 /* parse map definitions non-strictly, allowing extra attributes/data */ 79 bool relaxed_maps; 80 /* DEPRECATED: handle CO-RE relocations non-strictly, allowing failures. 81 * Value is ignored. Relocations always are processed non-strictly. 82 * Non-relocatable instructions are replaced with invalid ones to 83 * prevent accidental errors. 84 * */ 85 bool relaxed_core_relocs; 86 /* maps that set the 'pinning' attribute in their definition will have 87 * their pin_path attribute set to a file in this directory, and be 88 * auto-pinned to that path on load; defaults to "/sys/fs/bpf". 89 */ 90 const char *pin_root_path; 91 __u32 attach_prog_fd; 92 /* Additional kernel config content that augments and overrides 93 * system Kconfig for CONFIG_xxx externs. 94 */ 95 const char *kconfig; 96 }; 97 #define bpf_object_open_opts__last_field kconfig 98 99 LIBBPF_API struct bpf_object *bpf_object__open(const char *path); 100 LIBBPF_API struct bpf_object * 101 bpf_object__open_file(const char *path, const struct bpf_object_open_opts *opts); 102 LIBBPF_API struct bpf_object * 103 bpf_object__open_mem(const void *obj_buf, size_t obj_buf_sz, 104 const struct bpf_object_open_opts *opts); 105 106 /* deprecated bpf_object__open variants */ 107 LIBBPF_API struct bpf_object * 108 bpf_object__open_buffer(const void *obj_buf, size_t obj_buf_sz, 109 const char *name); 110 LIBBPF_API struct bpf_object * 111 bpf_object__open_xattr(struct bpf_object_open_attr *attr); 112 113 enum libbpf_pin_type { 114 LIBBPF_PIN_NONE, 115 /* PIN_BY_NAME: pin maps by name (in /sys/fs/bpf by default) */ 116 LIBBPF_PIN_BY_NAME, 117 }; 118 119 /* pin_maps and unpin_maps can both be called with a NULL path, in which case 120 * they will use the pin_path attribute of each map (and ignore all maps that 121 * don't have a pin_path set). 122 */ 123 LIBBPF_API int bpf_object__pin_maps(struct bpf_object *obj, const char *path); 124 LIBBPF_API int bpf_object__unpin_maps(struct bpf_object *obj, 125 const char *path); 126 LIBBPF_API int bpf_object__pin_programs(struct bpf_object *obj, 127 const char *path); 128 LIBBPF_API int bpf_object__unpin_programs(struct bpf_object *obj, 129 const char *path); 130 LIBBPF_API int bpf_object__pin(struct bpf_object *object, const char *path); 131 LIBBPF_API void bpf_object__close(struct bpf_object *object); 132 133 struct bpf_object_load_attr { 134 struct bpf_object *obj; 135 int log_level; 136 const char *target_btf_path; 137 }; 138 139 /* Load/unload object into/from kernel */ 140 LIBBPF_API int bpf_object__load(struct bpf_object *obj); 141 LIBBPF_API int bpf_object__load_xattr(struct bpf_object_load_attr *attr); 142 LIBBPF_API int bpf_object__unload(struct bpf_object *obj); 143 144 LIBBPF_API const char *bpf_object__name(const struct bpf_object *obj); 145 LIBBPF_API unsigned int bpf_object__kversion(const struct bpf_object *obj); 146 147 struct btf; 148 LIBBPF_API struct btf *bpf_object__btf(const struct bpf_object *obj); 149 LIBBPF_API int bpf_object__btf_fd(const struct bpf_object *obj); 150 151 LIBBPF_API struct bpf_program * 152 bpf_object__find_program_by_title(const struct bpf_object *obj, 153 const char *title); 154 LIBBPF_API struct bpf_program * 155 bpf_object__find_program_by_name(const struct bpf_object *obj, 156 const char *name); 157 158 LIBBPF_API struct bpf_object *bpf_object__next(struct bpf_object *prev); 159 #define bpf_object__for_each_safe(pos, tmp) \ 160 for ((pos) = bpf_object__next(NULL), \ 161 (tmp) = bpf_object__next(pos); \ 162 (pos) != NULL; \ 163 (pos) = (tmp), (tmp) = bpf_object__next(tmp)) 164 165 typedef void (*bpf_object_clear_priv_t)(struct bpf_object *, void *); 166 LIBBPF_API int bpf_object__set_priv(struct bpf_object *obj, void *priv, 167 bpf_object_clear_priv_t clear_priv); 168 LIBBPF_API void *bpf_object__priv(const struct bpf_object *prog); 169 170 LIBBPF_API int 171 libbpf_prog_type_by_name(const char *name, enum bpf_prog_type *prog_type, 172 enum bpf_attach_type *expected_attach_type); 173 LIBBPF_API int libbpf_attach_type_by_name(const char *name, 174 enum bpf_attach_type *attach_type); 175 LIBBPF_API int libbpf_find_vmlinux_btf_id(const char *name, 176 enum bpf_attach_type attach_type); 177 178 /* Accessors of bpf_program */ 179 struct bpf_program; 180 LIBBPF_API struct bpf_program *bpf_program__next(struct bpf_program *prog, 181 const struct bpf_object *obj); 182 183 #define bpf_object__for_each_program(pos, obj) \ 184 for ((pos) = bpf_program__next(NULL, (obj)); \ 185 (pos) != NULL; \ 186 (pos) = bpf_program__next((pos), (obj))) 187 188 LIBBPF_API struct bpf_program *bpf_program__prev(struct bpf_program *prog, 189 const struct bpf_object *obj); 190 191 typedef void (*bpf_program_clear_priv_t)(struct bpf_program *, void *); 192 193 LIBBPF_API int bpf_program__set_priv(struct bpf_program *prog, void *priv, 194 bpf_program_clear_priv_t clear_priv); 195 196 LIBBPF_API void *bpf_program__priv(const struct bpf_program *prog); 197 LIBBPF_API void bpf_program__set_ifindex(struct bpf_program *prog, 198 __u32 ifindex); 199 200 LIBBPF_API const char *bpf_program__name(const struct bpf_program *prog); 201 LIBBPF_API const char *bpf_program__title(const struct bpf_program *prog, 202 bool needs_copy); 203 204 /* returns program size in bytes */ 205 LIBBPF_API size_t bpf_program__size(const struct bpf_program *prog); 206 207 LIBBPF_API int bpf_program__load(struct bpf_program *prog, char *license, 208 __u32 kern_version); 209 LIBBPF_API int bpf_program__fd(const struct bpf_program *prog); 210 LIBBPF_API int bpf_program__pin_instance(struct bpf_program *prog, 211 const char *path, 212 int instance); 213 LIBBPF_API int bpf_program__unpin_instance(struct bpf_program *prog, 214 const char *path, 215 int instance); 216 LIBBPF_API int bpf_program__pin(struct bpf_program *prog, const char *path); 217 LIBBPF_API int bpf_program__unpin(struct bpf_program *prog, const char *path); 218 LIBBPF_API void bpf_program__unload(struct bpf_program *prog); 219 220 struct bpf_link; 221 222 LIBBPF_API struct bpf_link *bpf_link__open(const char *path); 223 LIBBPF_API int bpf_link__fd(const struct bpf_link *link); 224 LIBBPF_API const char *bpf_link__pin_path(const struct bpf_link *link); 225 LIBBPF_API int bpf_link__pin(struct bpf_link *link, const char *path); 226 LIBBPF_API int bpf_link__unpin(struct bpf_link *link); 227 LIBBPF_API int bpf_link__update_program(struct bpf_link *link, 228 struct bpf_program *prog); 229 LIBBPF_API void bpf_link__disconnect(struct bpf_link *link); 230 LIBBPF_API int bpf_link__destroy(struct bpf_link *link); 231 232 LIBBPF_API struct bpf_link * 233 bpf_program__attach(struct bpf_program *prog); 234 LIBBPF_API struct bpf_link * 235 bpf_program__attach_perf_event(struct bpf_program *prog, int pfd); 236 LIBBPF_API struct bpf_link * 237 bpf_program__attach_kprobe(struct bpf_program *prog, bool retprobe, 238 const char *func_name); 239 LIBBPF_API struct bpf_link * 240 bpf_program__attach_uprobe(struct bpf_program *prog, bool retprobe, 241 pid_t pid, const char *binary_path, 242 size_t func_offset); 243 LIBBPF_API struct bpf_link * 244 bpf_program__attach_tracepoint(struct bpf_program *prog, 245 const char *tp_category, 246 const char *tp_name); 247 LIBBPF_API struct bpf_link * 248 bpf_program__attach_raw_tracepoint(struct bpf_program *prog, 249 const char *tp_name); 250 LIBBPF_API struct bpf_link * 251 bpf_program__attach_trace(struct bpf_program *prog); 252 LIBBPF_API struct bpf_link * 253 bpf_program__attach_lsm(struct bpf_program *prog); 254 LIBBPF_API struct bpf_link * 255 bpf_program__attach_cgroup(struct bpf_program *prog, int cgroup_fd); 256 257 struct bpf_map; 258 259 LIBBPF_API struct bpf_link *bpf_map__attach_struct_ops(struct bpf_map *map); 260 261 struct bpf_insn; 262 263 /* 264 * Libbpf allows callers to adjust BPF programs before being loaded 265 * into kernel. One program in an object file can be transformed into 266 * multiple variants to be attached to different hooks. 267 * 268 * bpf_program_prep_t, bpf_program__set_prep and bpf_program__nth_fd 269 * form an API for this purpose. 270 * 271 * - bpf_program_prep_t: 272 * Defines a 'preprocessor', which is a caller defined function 273 * passed to libbpf through bpf_program__set_prep(), and will be 274 * called before program is loaded. The processor should adjust 275 * the program one time for each instance according to the instance id 276 * passed to it. 277 * 278 * - bpf_program__set_prep: 279 * Attaches a preprocessor to a BPF program. The number of instances 280 * that should be created is also passed through this function. 281 * 282 * - bpf_program__nth_fd: 283 * After the program is loaded, get resulting FD of a given instance 284 * of the BPF program. 285 * 286 * If bpf_program__set_prep() is not used, the program would be loaded 287 * without adjustment during bpf_object__load(). The program has only 288 * one instance. In this case bpf_program__fd(prog) is equal to 289 * bpf_program__nth_fd(prog, 0). 290 */ 291 292 struct bpf_prog_prep_result { 293 /* 294 * If not NULL, load new instruction array. 295 * If set to NULL, don't load this instance. 296 */ 297 struct bpf_insn *new_insn_ptr; 298 int new_insn_cnt; 299 300 /* If not NULL, result FD is written to it. */ 301 int *pfd; 302 }; 303 304 /* 305 * Parameters of bpf_program_prep_t: 306 * - prog: The bpf_program being loaded. 307 * - n: Index of instance being generated. 308 * - insns: BPF instructions array. 309 * - insns_cnt:Number of instructions in insns. 310 * - res: Output parameter, result of transformation. 311 * 312 * Return value: 313 * - Zero: pre-processing success. 314 * - Non-zero: pre-processing error, stop loading. 315 */ 316 typedef int (*bpf_program_prep_t)(struct bpf_program *prog, int n, 317 struct bpf_insn *insns, int insns_cnt, 318 struct bpf_prog_prep_result *res); 319 320 LIBBPF_API int bpf_program__set_prep(struct bpf_program *prog, int nr_instance, 321 bpf_program_prep_t prep); 322 323 LIBBPF_API int bpf_program__nth_fd(const struct bpf_program *prog, int n); 324 325 /* 326 * Adjust type of BPF program. Default is kprobe. 327 */ 328 LIBBPF_API int bpf_program__set_socket_filter(struct bpf_program *prog); 329 LIBBPF_API int bpf_program__set_tracepoint(struct bpf_program *prog); 330 LIBBPF_API int bpf_program__set_raw_tracepoint(struct bpf_program *prog); 331 LIBBPF_API int bpf_program__set_kprobe(struct bpf_program *prog); 332 LIBBPF_API int bpf_program__set_lsm(struct bpf_program *prog); 333 LIBBPF_API int bpf_program__set_sched_cls(struct bpf_program *prog); 334 LIBBPF_API int bpf_program__set_sched_act(struct bpf_program *prog); 335 LIBBPF_API int bpf_program__set_xdp(struct bpf_program *prog); 336 LIBBPF_API int bpf_program__set_perf_event(struct bpf_program *prog); 337 LIBBPF_API int bpf_program__set_tracing(struct bpf_program *prog); 338 LIBBPF_API int bpf_program__set_struct_ops(struct bpf_program *prog); 339 LIBBPF_API int bpf_program__set_extension(struct bpf_program *prog); 340 341 LIBBPF_API enum bpf_prog_type bpf_program__get_type(struct bpf_program *prog); 342 LIBBPF_API void bpf_program__set_type(struct bpf_program *prog, 343 enum bpf_prog_type type); 344 345 LIBBPF_API enum bpf_attach_type 346 bpf_program__get_expected_attach_type(struct bpf_program *prog); 347 LIBBPF_API void 348 bpf_program__set_expected_attach_type(struct bpf_program *prog, 349 enum bpf_attach_type type); 350 351 LIBBPF_API int 352 bpf_program__set_attach_target(struct bpf_program *prog, int attach_prog_fd, 353 const char *attach_func_name); 354 355 LIBBPF_API bool bpf_program__is_socket_filter(const struct bpf_program *prog); 356 LIBBPF_API bool bpf_program__is_tracepoint(const struct bpf_program *prog); 357 LIBBPF_API bool bpf_program__is_raw_tracepoint(const struct bpf_program *prog); 358 LIBBPF_API bool bpf_program__is_kprobe(const struct bpf_program *prog); 359 LIBBPF_API bool bpf_program__is_lsm(const struct bpf_program *prog); 360 LIBBPF_API bool bpf_program__is_sched_cls(const struct bpf_program *prog); 361 LIBBPF_API bool bpf_program__is_sched_act(const struct bpf_program *prog); 362 LIBBPF_API bool bpf_program__is_xdp(const struct bpf_program *prog); 363 LIBBPF_API bool bpf_program__is_perf_event(const struct bpf_program *prog); 364 LIBBPF_API bool bpf_program__is_tracing(const struct bpf_program *prog); 365 LIBBPF_API bool bpf_program__is_struct_ops(const struct bpf_program *prog); 366 LIBBPF_API bool bpf_program__is_extension(const struct bpf_program *prog); 367 368 /* 369 * No need for __attribute__((packed)), all members of 'bpf_map_def' 370 * are all aligned. In addition, using __attribute__((packed)) 371 * would trigger a -Wpacked warning message, and lead to an error 372 * if -Werror is set. 373 */ 374 struct bpf_map_def { 375 unsigned int type; 376 unsigned int key_size; 377 unsigned int value_size; 378 unsigned int max_entries; 379 unsigned int map_flags; 380 }; 381 382 /* 383 * The 'struct bpf_map' in include/linux/bpf.h is internal to the kernel, 384 * so no need to worry about a name clash. 385 */ 386 LIBBPF_API struct bpf_map * 387 bpf_object__find_map_by_name(const struct bpf_object *obj, const char *name); 388 389 LIBBPF_API int 390 bpf_object__find_map_fd_by_name(const struct bpf_object *obj, const char *name); 391 392 /* 393 * Get bpf_map through the offset of corresponding struct bpf_map_def 394 * in the BPF object file. 395 */ 396 LIBBPF_API struct bpf_map * 397 bpf_object__find_map_by_offset(struct bpf_object *obj, size_t offset); 398 399 LIBBPF_API struct bpf_map * 400 bpf_map__next(const struct bpf_map *map, const struct bpf_object *obj); 401 #define bpf_object__for_each_map(pos, obj) \ 402 for ((pos) = bpf_map__next(NULL, (obj)); \ 403 (pos) != NULL; \ 404 (pos) = bpf_map__next((pos), (obj))) 405 #define bpf_map__for_each bpf_object__for_each_map 406 407 LIBBPF_API struct bpf_map * 408 bpf_map__prev(const struct bpf_map *map, const struct bpf_object *obj); 409 410 LIBBPF_API int bpf_map__fd(const struct bpf_map *map); 411 LIBBPF_API const struct bpf_map_def *bpf_map__def(const struct bpf_map *map); 412 LIBBPF_API const char *bpf_map__name(const struct bpf_map *map); 413 LIBBPF_API __u32 bpf_map__btf_key_type_id(const struct bpf_map *map); 414 LIBBPF_API __u32 bpf_map__btf_value_type_id(const struct bpf_map *map); 415 416 typedef void (*bpf_map_clear_priv_t)(struct bpf_map *, void *); 417 LIBBPF_API int bpf_map__set_priv(struct bpf_map *map, void *priv, 418 bpf_map_clear_priv_t clear_priv); 419 LIBBPF_API void *bpf_map__priv(const struct bpf_map *map); 420 LIBBPF_API int bpf_map__set_initial_value(struct bpf_map *map, 421 const void *data, size_t size); 422 LIBBPF_API int bpf_map__reuse_fd(struct bpf_map *map, int fd); 423 LIBBPF_API int bpf_map__resize(struct bpf_map *map, __u32 max_entries); 424 LIBBPF_API bool bpf_map__is_offload_neutral(const struct bpf_map *map); 425 LIBBPF_API bool bpf_map__is_internal(const struct bpf_map *map); 426 LIBBPF_API void bpf_map__set_ifindex(struct bpf_map *map, __u32 ifindex); 427 LIBBPF_API int bpf_map__set_pin_path(struct bpf_map *map, const char *path); 428 LIBBPF_API const char *bpf_map__get_pin_path(const struct bpf_map *map); 429 LIBBPF_API bool bpf_map__is_pinned(const struct bpf_map *map); 430 LIBBPF_API int bpf_map__pin(struct bpf_map *map, const char *path); 431 LIBBPF_API int bpf_map__unpin(struct bpf_map *map, const char *path); 432 433 LIBBPF_API int bpf_map__set_inner_map_fd(struct bpf_map *map, int fd); 434 435 LIBBPF_API long libbpf_get_error(const void *ptr); 436 437 struct bpf_prog_load_attr { 438 const char *file; 439 enum bpf_prog_type prog_type; 440 enum bpf_attach_type expected_attach_type; 441 int ifindex; 442 int log_level; 443 int prog_flags; 444 }; 445 446 LIBBPF_API int bpf_prog_load_xattr(const struct bpf_prog_load_attr *attr, 447 struct bpf_object **pobj, int *prog_fd); 448 LIBBPF_API int bpf_prog_load(const char *file, enum bpf_prog_type type, 449 struct bpf_object **pobj, int *prog_fd); 450 451 struct xdp_link_info { 452 __u32 prog_id; 453 __u32 drv_prog_id; 454 __u32 hw_prog_id; 455 __u32 skb_prog_id; 456 __u8 attach_mode; 457 }; 458 459 struct bpf_xdp_set_link_opts { 460 size_t sz; 461 int old_fd; 462 }; 463 #define bpf_xdp_set_link_opts__last_field old_fd 464 465 LIBBPF_API int bpf_set_link_xdp_fd(int ifindex, int fd, __u32 flags); 466 LIBBPF_API int bpf_set_link_xdp_fd_opts(int ifindex, int fd, __u32 flags, 467 const struct bpf_xdp_set_link_opts *opts); 468 LIBBPF_API int bpf_get_link_xdp_id(int ifindex, __u32 *prog_id, __u32 flags); 469 LIBBPF_API int bpf_get_link_xdp_info(int ifindex, struct xdp_link_info *info, 470 size_t info_size, __u32 flags); 471 472 struct perf_buffer; 473 474 typedef void (*perf_buffer_sample_fn)(void *ctx, int cpu, 475 void *data, __u32 size); 476 typedef void (*perf_buffer_lost_fn)(void *ctx, int cpu, __u64 cnt); 477 478 /* common use perf buffer options */ 479 struct perf_buffer_opts { 480 /* if specified, sample_cb is called for each sample */ 481 perf_buffer_sample_fn sample_cb; 482 /* if specified, lost_cb is called for each batch of lost samples */ 483 perf_buffer_lost_fn lost_cb; 484 /* ctx is provided to sample_cb and lost_cb */ 485 void *ctx; 486 }; 487 488 LIBBPF_API struct perf_buffer * 489 perf_buffer__new(int map_fd, size_t page_cnt, 490 const struct perf_buffer_opts *opts); 491 492 enum bpf_perf_event_ret { 493 LIBBPF_PERF_EVENT_DONE = 0, 494 LIBBPF_PERF_EVENT_ERROR = -1, 495 LIBBPF_PERF_EVENT_CONT = -2, 496 }; 497 498 struct perf_event_header; 499 500 typedef enum bpf_perf_event_ret 501 (*perf_buffer_event_fn)(void *ctx, int cpu, struct perf_event_header *event); 502 503 /* raw perf buffer options, giving most power and control */ 504 struct perf_buffer_raw_opts { 505 /* perf event attrs passed directly into perf_event_open() */ 506 struct perf_event_attr *attr; 507 /* raw event callback */ 508 perf_buffer_event_fn event_cb; 509 /* ctx is provided to event_cb */ 510 void *ctx; 511 /* if cpu_cnt == 0, open all on all possible CPUs (up to the number of 512 * max_entries of given PERF_EVENT_ARRAY map) 513 */ 514 int cpu_cnt; 515 /* if cpu_cnt > 0, cpus is an array of CPUs to open ring buffers on */ 516 int *cpus; 517 /* if cpu_cnt > 0, map_keys specify map keys to set per-CPU FDs for */ 518 int *map_keys; 519 }; 520 521 LIBBPF_API struct perf_buffer * 522 perf_buffer__new_raw(int map_fd, size_t page_cnt, 523 const struct perf_buffer_raw_opts *opts); 524 525 LIBBPF_API void perf_buffer__free(struct perf_buffer *pb); 526 LIBBPF_API int perf_buffer__poll(struct perf_buffer *pb, int timeout_ms); 527 528 typedef enum bpf_perf_event_ret 529 (*bpf_perf_event_print_t)(struct perf_event_header *hdr, 530 void *private_data); 531 LIBBPF_API enum bpf_perf_event_ret 532 bpf_perf_event_read_simple(void *mmap_mem, size_t mmap_size, size_t page_size, 533 void **copy_mem, size_t *copy_size, 534 bpf_perf_event_print_t fn, void *private_data); 535 536 struct bpf_prog_linfo; 537 struct bpf_prog_info; 538 539 LIBBPF_API void bpf_prog_linfo__free(struct bpf_prog_linfo *prog_linfo); 540 LIBBPF_API struct bpf_prog_linfo * 541 bpf_prog_linfo__new(const struct bpf_prog_info *info); 542 LIBBPF_API const struct bpf_line_info * 543 bpf_prog_linfo__lfind_addr_func(const struct bpf_prog_linfo *prog_linfo, 544 __u64 addr, __u32 func_idx, __u32 nr_skip); 545 LIBBPF_API const struct bpf_line_info * 546 bpf_prog_linfo__lfind(const struct bpf_prog_linfo *prog_linfo, 547 __u32 insn_off, __u32 nr_skip); 548 549 /* 550 * Probe for supported system features 551 * 552 * Note that running many of these probes in a short amount of time can cause 553 * the kernel to reach the maximal size of lockable memory allowed for the 554 * user, causing subsequent probes to fail. In this case, the caller may want 555 * to adjust that limit with setrlimit(). 556 */ 557 LIBBPF_API bool bpf_probe_prog_type(enum bpf_prog_type prog_type, 558 __u32 ifindex); 559 LIBBPF_API bool bpf_probe_map_type(enum bpf_map_type map_type, __u32 ifindex); 560 LIBBPF_API bool bpf_probe_helper(enum bpf_func_id id, 561 enum bpf_prog_type prog_type, __u32 ifindex); 562 LIBBPF_API bool bpf_probe_large_insn_limit(__u32 ifindex); 563 564 /* 565 * Get bpf_prog_info in continuous memory 566 * 567 * struct bpf_prog_info has multiple arrays. The user has option to choose 568 * arrays to fetch from kernel. The following APIs provide an uniform way to 569 * fetch these data. All arrays in bpf_prog_info are stored in a single 570 * continuous memory region. This makes it easy to store the info in a 571 * file. 572 * 573 * Before writing bpf_prog_info_linear to files, it is necessary to 574 * translate pointers in bpf_prog_info to offsets. Helper functions 575 * bpf_program__bpil_addr_to_offs() and bpf_program__bpil_offs_to_addr() 576 * are introduced to switch between pointers and offsets. 577 * 578 * Examples: 579 * # To fetch map_ids and prog_tags: 580 * __u64 arrays = (1UL << BPF_PROG_INFO_MAP_IDS) | 581 * (1UL << BPF_PROG_INFO_PROG_TAGS); 582 * struct bpf_prog_info_linear *info_linear = 583 * bpf_program__get_prog_info_linear(fd, arrays); 584 * 585 * # To save data in file 586 * bpf_program__bpil_addr_to_offs(info_linear); 587 * write(f, info_linear, sizeof(*info_linear) + info_linear->data_len); 588 * 589 * # To read data from file 590 * read(f, info_linear, <proper_size>); 591 * bpf_program__bpil_offs_to_addr(info_linear); 592 */ 593 enum bpf_prog_info_array { 594 BPF_PROG_INFO_FIRST_ARRAY = 0, 595 BPF_PROG_INFO_JITED_INSNS = 0, 596 BPF_PROG_INFO_XLATED_INSNS, 597 BPF_PROG_INFO_MAP_IDS, 598 BPF_PROG_INFO_JITED_KSYMS, 599 BPF_PROG_INFO_JITED_FUNC_LENS, 600 BPF_PROG_INFO_FUNC_INFO, 601 BPF_PROG_INFO_LINE_INFO, 602 BPF_PROG_INFO_JITED_LINE_INFO, 603 BPF_PROG_INFO_PROG_TAGS, 604 BPF_PROG_INFO_LAST_ARRAY, 605 }; 606 607 struct bpf_prog_info_linear { 608 /* size of struct bpf_prog_info, when the tool is compiled */ 609 __u32 info_len; 610 /* total bytes allocated for data, round up to 8 bytes */ 611 __u32 data_len; 612 /* which arrays are included in data */ 613 __u64 arrays; 614 struct bpf_prog_info info; 615 __u8 data[]; 616 }; 617 618 LIBBPF_API struct bpf_prog_info_linear * 619 bpf_program__get_prog_info_linear(int fd, __u64 arrays); 620 621 LIBBPF_API void 622 bpf_program__bpil_addr_to_offs(struct bpf_prog_info_linear *info_linear); 623 624 LIBBPF_API void 625 bpf_program__bpil_offs_to_addr(struct bpf_prog_info_linear *info_linear); 626 627 /* 628 * A helper function to get the number of possible CPUs before looking up 629 * per-CPU maps. Negative errno is returned on failure. 630 * 631 * Example usage: 632 * 633 * int ncpus = libbpf_num_possible_cpus(); 634 * if (ncpus < 0) { 635 * // error handling 636 * } 637 * long values[ncpus]; 638 * bpf_map_lookup_elem(per_cpu_map_fd, key, values); 639 * 640 */ 641 LIBBPF_API int libbpf_num_possible_cpus(void); 642 643 struct bpf_map_skeleton { 644 const char *name; 645 struct bpf_map **map; 646 void **mmaped; 647 }; 648 649 struct bpf_prog_skeleton { 650 const char *name; 651 struct bpf_program **prog; 652 struct bpf_link **link; 653 }; 654 655 struct bpf_object_skeleton { 656 size_t sz; /* size of this struct, for forward/backward compatibility */ 657 658 const char *name; 659 void *data; 660 size_t data_sz; 661 662 struct bpf_object **obj; 663 664 int map_cnt; 665 int map_skel_sz; /* sizeof(struct bpf_skeleton_map) */ 666 struct bpf_map_skeleton *maps; 667 668 int prog_cnt; 669 int prog_skel_sz; /* sizeof(struct bpf_skeleton_prog) */ 670 struct bpf_prog_skeleton *progs; 671 }; 672 673 LIBBPF_API int 674 bpf_object__open_skeleton(struct bpf_object_skeleton *s, 675 const struct bpf_object_open_opts *opts); 676 LIBBPF_API int bpf_object__load_skeleton(struct bpf_object_skeleton *s); 677 LIBBPF_API int bpf_object__attach_skeleton(struct bpf_object_skeleton *s); 678 LIBBPF_API void bpf_object__detach_skeleton(struct bpf_object_skeleton *s); 679 LIBBPF_API void bpf_object__destroy_skeleton(struct bpf_object_skeleton *s); 680 681 enum libbpf_tristate { 682 TRI_NO = 0, 683 TRI_YES = 1, 684 TRI_MODULE = 2, 685 }; 686 687 #ifdef __cplusplus 688 } /* extern "C" */ 689 #endif 690 691 #endif /* __LIBBPF_LIBBPF_H */ 692