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 LIBBPF_API bool bpf_program__autoload(const struct bpf_program *prog); 204 LIBBPF_API int bpf_program__set_autoload(struct bpf_program *prog, bool autoload); 205 206 /* returns program size in bytes */ 207 LIBBPF_API size_t bpf_program__size(const struct bpf_program *prog); 208 209 LIBBPF_API int bpf_program__load(struct bpf_program *prog, char *license, 210 __u32 kern_version); 211 LIBBPF_API int bpf_program__fd(const struct bpf_program *prog); 212 LIBBPF_API int bpf_program__pin_instance(struct bpf_program *prog, 213 const char *path, 214 int instance); 215 LIBBPF_API int bpf_program__unpin_instance(struct bpf_program *prog, 216 const char *path, 217 int instance); 218 LIBBPF_API int bpf_program__pin(struct bpf_program *prog, const char *path); 219 LIBBPF_API int bpf_program__unpin(struct bpf_program *prog, const char *path); 220 LIBBPF_API void bpf_program__unload(struct bpf_program *prog); 221 222 struct bpf_link; 223 224 LIBBPF_API struct bpf_link *bpf_link__open(const char *path); 225 LIBBPF_API int bpf_link__fd(const struct bpf_link *link); 226 LIBBPF_API const char *bpf_link__pin_path(const struct bpf_link *link); 227 LIBBPF_API int bpf_link__pin(struct bpf_link *link, const char *path); 228 LIBBPF_API int bpf_link__unpin(struct bpf_link *link); 229 LIBBPF_API int bpf_link__update_program(struct bpf_link *link, 230 struct bpf_program *prog); 231 LIBBPF_API void bpf_link__disconnect(struct bpf_link *link); 232 LIBBPF_API int bpf_link__detach(struct bpf_link *link); 233 LIBBPF_API int bpf_link__destroy(struct bpf_link *link); 234 235 LIBBPF_API struct bpf_link * 236 bpf_program__attach(struct bpf_program *prog); 237 LIBBPF_API struct bpf_link * 238 bpf_program__attach_perf_event(struct bpf_program *prog, int pfd); 239 LIBBPF_API struct bpf_link * 240 bpf_program__attach_kprobe(struct bpf_program *prog, bool retprobe, 241 const char *func_name); 242 LIBBPF_API struct bpf_link * 243 bpf_program__attach_uprobe(struct bpf_program *prog, bool retprobe, 244 pid_t pid, const char *binary_path, 245 size_t func_offset); 246 LIBBPF_API struct bpf_link * 247 bpf_program__attach_tracepoint(struct bpf_program *prog, 248 const char *tp_category, 249 const char *tp_name); 250 LIBBPF_API struct bpf_link * 251 bpf_program__attach_raw_tracepoint(struct bpf_program *prog, 252 const char *tp_name); 253 LIBBPF_API struct bpf_link * 254 bpf_program__attach_trace(struct bpf_program *prog); 255 LIBBPF_API struct bpf_link * 256 bpf_program__attach_lsm(struct bpf_program *prog); 257 LIBBPF_API struct bpf_link * 258 bpf_program__attach_cgroup(struct bpf_program *prog, int cgroup_fd); 259 LIBBPF_API struct bpf_link * 260 bpf_program__attach_netns(struct bpf_program *prog, int netns_fd); 261 LIBBPF_API struct bpf_link * 262 bpf_program__attach_xdp(struct bpf_program *prog, int ifindex); 263 264 struct bpf_map; 265 266 LIBBPF_API struct bpf_link *bpf_map__attach_struct_ops(struct bpf_map *map); 267 268 struct bpf_iter_attach_opts { 269 size_t sz; /* size of this struct for forward/backward compatibility */ 270 __u32 map_fd; 271 }; 272 #define bpf_iter_attach_opts__last_field map_fd 273 274 LIBBPF_API struct bpf_link * 275 bpf_program__attach_iter(struct bpf_program *prog, 276 const struct bpf_iter_attach_opts *opts); 277 278 struct bpf_insn; 279 280 /* 281 * Libbpf allows callers to adjust BPF programs before being loaded 282 * into kernel. One program in an object file can be transformed into 283 * multiple variants to be attached to different hooks. 284 * 285 * bpf_program_prep_t, bpf_program__set_prep and bpf_program__nth_fd 286 * form an API for this purpose. 287 * 288 * - bpf_program_prep_t: 289 * Defines a 'preprocessor', which is a caller defined function 290 * passed to libbpf through bpf_program__set_prep(), and will be 291 * called before program is loaded. The processor should adjust 292 * the program one time for each instance according to the instance id 293 * passed to it. 294 * 295 * - bpf_program__set_prep: 296 * Attaches a preprocessor to a BPF program. The number of instances 297 * that should be created is also passed through this function. 298 * 299 * - bpf_program__nth_fd: 300 * After the program is loaded, get resulting FD of a given instance 301 * of the BPF program. 302 * 303 * If bpf_program__set_prep() is not used, the program would be loaded 304 * without adjustment during bpf_object__load(). The program has only 305 * one instance. In this case bpf_program__fd(prog) is equal to 306 * bpf_program__nth_fd(prog, 0). 307 */ 308 309 struct bpf_prog_prep_result { 310 /* 311 * If not NULL, load new instruction array. 312 * If set to NULL, don't load this instance. 313 */ 314 struct bpf_insn *new_insn_ptr; 315 int new_insn_cnt; 316 317 /* If not NULL, result FD is written to it. */ 318 int *pfd; 319 }; 320 321 /* 322 * Parameters of bpf_program_prep_t: 323 * - prog: The bpf_program being loaded. 324 * - n: Index of instance being generated. 325 * - insns: BPF instructions array. 326 * - insns_cnt:Number of instructions in insns. 327 * - res: Output parameter, result of transformation. 328 * 329 * Return value: 330 * - Zero: pre-processing success. 331 * - Non-zero: pre-processing error, stop loading. 332 */ 333 typedef int (*bpf_program_prep_t)(struct bpf_program *prog, int n, 334 struct bpf_insn *insns, int insns_cnt, 335 struct bpf_prog_prep_result *res); 336 337 LIBBPF_API int bpf_program__set_prep(struct bpf_program *prog, int nr_instance, 338 bpf_program_prep_t prep); 339 340 LIBBPF_API int bpf_program__nth_fd(const struct bpf_program *prog, int n); 341 342 /* 343 * Adjust type of BPF program. Default is kprobe. 344 */ 345 LIBBPF_API int bpf_program__set_socket_filter(struct bpf_program *prog); 346 LIBBPF_API int bpf_program__set_tracepoint(struct bpf_program *prog); 347 LIBBPF_API int bpf_program__set_raw_tracepoint(struct bpf_program *prog); 348 LIBBPF_API int bpf_program__set_kprobe(struct bpf_program *prog); 349 LIBBPF_API int bpf_program__set_lsm(struct bpf_program *prog); 350 LIBBPF_API int bpf_program__set_sched_cls(struct bpf_program *prog); 351 LIBBPF_API int bpf_program__set_sched_act(struct bpf_program *prog); 352 LIBBPF_API int bpf_program__set_xdp(struct bpf_program *prog); 353 LIBBPF_API int bpf_program__set_perf_event(struct bpf_program *prog); 354 LIBBPF_API int bpf_program__set_tracing(struct bpf_program *prog); 355 LIBBPF_API int bpf_program__set_struct_ops(struct bpf_program *prog); 356 LIBBPF_API int bpf_program__set_extension(struct bpf_program *prog); 357 LIBBPF_API int bpf_program__set_sk_lookup(struct bpf_program *prog); 358 359 LIBBPF_API enum bpf_prog_type bpf_program__get_type(struct bpf_program *prog); 360 LIBBPF_API void bpf_program__set_type(struct bpf_program *prog, 361 enum bpf_prog_type type); 362 363 LIBBPF_API enum bpf_attach_type 364 bpf_program__get_expected_attach_type(struct bpf_program *prog); 365 LIBBPF_API void 366 bpf_program__set_expected_attach_type(struct bpf_program *prog, 367 enum bpf_attach_type type); 368 369 LIBBPF_API int 370 bpf_program__set_attach_target(struct bpf_program *prog, int attach_prog_fd, 371 const char *attach_func_name); 372 373 LIBBPF_API bool bpf_program__is_socket_filter(const struct bpf_program *prog); 374 LIBBPF_API bool bpf_program__is_tracepoint(const struct bpf_program *prog); 375 LIBBPF_API bool bpf_program__is_raw_tracepoint(const struct bpf_program *prog); 376 LIBBPF_API bool bpf_program__is_kprobe(const struct bpf_program *prog); 377 LIBBPF_API bool bpf_program__is_lsm(const struct bpf_program *prog); 378 LIBBPF_API bool bpf_program__is_sched_cls(const struct bpf_program *prog); 379 LIBBPF_API bool bpf_program__is_sched_act(const struct bpf_program *prog); 380 LIBBPF_API bool bpf_program__is_xdp(const struct bpf_program *prog); 381 LIBBPF_API bool bpf_program__is_perf_event(const struct bpf_program *prog); 382 LIBBPF_API bool bpf_program__is_tracing(const struct bpf_program *prog); 383 LIBBPF_API bool bpf_program__is_struct_ops(const struct bpf_program *prog); 384 LIBBPF_API bool bpf_program__is_extension(const struct bpf_program *prog); 385 LIBBPF_API bool bpf_program__is_sk_lookup(const struct bpf_program *prog); 386 387 /* 388 * No need for __attribute__((packed)), all members of 'bpf_map_def' 389 * are all aligned. In addition, using __attribute__((packed)) 390 * would trigger a -Wpacked warning message, and lead to an error 391 * if -Werror is set. 392 */ 393 struct bpf_map_def { 394 unsigned int type; 395 unsigned int key_size; 396 unsigned int value_size; 397 unsigned int max_entries; 398 unsigned int map_flags; 399 }; 400 401 /* 402 * The 'struct bpf_map' in include/linux/bpf.h is internal to the kernel, 403 * so no need to worry about a name clash. 404 */ 405 LIBBPF_API struct bpf_map * 406 bpf_object__find_map_by_name(const struct bpf_object *obj, const char *name); 407 408 LIBBPF_API int 409 bpf_object__find_map_fd_by_name(const struct bpf_object *obj, const char *name); 410 411 /* 412 * Get bpf_map through the offset of corresponding struct bpf_map_def 413 * in the BPF object file. 414 */ 415 LIBBPF_API struct bpf_map * 416 bpf_object__find_map_by_offset(struct bpf_object *obj, size_t offset); 417 418 LIBBPF_API struct bpf_map * 419 bpf_map__next(const struct bpf_map *map, const struct bpf_object *obj); 420 #define bpf_object__for_each_map(pos, obj) \ 421 for ((pos) = bpf_map__next(NULL, (obj)); \ 422 (pos) != NULL; \ 423 (pos) = bpf_map__next((pos), (obj))) 424 #define bpf_map__for_each bpf_object__for_each_map 425 426 LIBBPF_API struct bpf_map * 427 bpf_map__prev(const struct bpf_map *map, const struct bpf_object *obj); 428 429 /* get/set map FD */ 430 LIBBPF_API int bpf_map__fd(const struct bpf_map *map); 431 LIBBPF_API int bpf_map__reuse_fd(struct bpf_map *map, int fd); 432 /* get map definition */ 433 LIBBPF_API const struct bpf_map_def *bpf_map__def(const struct bpf_map *map); 434 /* get map name */ 435 LIBBPF_API const char *bpf_map__name(const struct bpf_map *map); 436 /* get/set map type */ 437 LIBBPF_API enum bpf_map_type bpf_map__type(const struct bpf_map *map); 438 LIBBPF_API int bpf_map__set_type(struct bpf_map *map, enum bpf_map_type type); 439 /* get/set map size (max_entries) */ 440 LIBBPF_API __u32 bpf_map__max_entries(const struct bpf_map *map); 441 LIBBPF_API int bpf_map__set_max_entries(struct bpf_map *map, __u32 max_entries); 442 LIBBPF_API int bpf_map__resize(struct bpf_map *map, __u32 max_entries); 443 /* get/set map flags */ 444 LIBBPF_API __u32 bpf_map__map_flags(const struct bpf_map *map); 445 LIBBPF_API int bpf_map__set_map_flags(struct bpf_map *map, __u32 flags); 446 /* get/set map NUMA node */ 447 LIBBPF_API __u32 bpf_map__numa_node(const struct bpf_map *map); 448 LIBBPF_API int bpf_map__set_numa_node(struct bpf_map *map, __u32 numa_node); 449 /* get/set map key size */ 450 LIBBPF_API __u32 bpf_map__key_size(const struct bpf_map *map); 451 LIBBPF_API int bpf_map__set_key_size(struct bpf_map *map, __u32 size); 452 /* get/set map value size */ 453 LIBBPF_API __u32 bpf_map__value_size(const struct bpf_map *map); 454 LIBBPF_API int bpf_map__set_value_size(struct bpf_map *map, __u32 size); 455 /* get map key/value BTF type IDs */ 456 LIBBPF_API __u32 bpf_map__btf_key_type_id(const struct bpf_map *map); 457 LIBBPF_API __u32 bpf_map__btf_value_type_id(const struct bpf_map *map); 458 /* get/set map if_index */ 459 LIBBPF_API __u32 bpf_map__ifindex(const struct bpf_map *map); 460 LIBBPF_API int bpf_map__set_ifindex(struct bpf_map *map, __u32 ifindex); 461 462 typedef void (*bpf_map_clear_priv_t)(struct bpf_map *, void *); 463 LIBBPF_API int bpf_map__set_priv(struct bpf_map *map, void *priv, 464 bpf_map_clear_priv_t clear_priv); 465 LIBBPF_API void *bpf_map__priv(const struct bpf_map *map); 466 LIBBPF_API int bpf_map__set_initial_value(struct bpf_map *map, 467 const void *data, size_t size); 468 LIBBPF_API bool bpf_map__is_offload_neutral(const struct bpf_map *map); 469 LIBBPF_API bool bpf_map__is_internal(const struct bpf_map *map); 470 LIBBPF_API int bpf_map__set_pin_path(struct bpf_map *map, const char *path); 471 LIBBPF_API const char *bpf_map__get_pin_path(const struct bpf_map *map); 472 LIBBPF_API bool bpf_map__is_pinned(const struct bpf_map *map); 473 LIBBPF_API int bpf_map__pin(struct bpf_map *map, const char *path); 474 LIBBPF_API int bpf_map__unpin(struct bpf_map *map, const char *path); 475 476 LIBBPF_API int bpf_map__set_inner_map_fd(struct bpf_map *map, int fd); 477 478 LIBBPF_API long libbpf_get_error(const void *ptr); 479 480 struct bpf_prog_load_attr { 481 const char *file; 482 enum bpf_prog_type prog_type; 483 enum bpf_attach_type expected_attach_type; 484 int ifindex; 485 int log_level; 486 int prog_flags; 487 }; 488 489 LIBBPF_API int bpf_prog_load_xattr(const struct bpf_prog_load_attr *attr, 490 struct bpf_object **pobj, int *prog_fd); 491 LIBBPF_API int bpf_prog_load(const char *file, enum bpf_prog_type type, 492 struct bpf_object **pobj, int *prog_fd); 493 494 struct xdp_link_info { 495 __u32 prog_id; 496 __u32 drv_prog_id; 497 __u32 hw_prog_id; 498 __u32 skb_prog_id; 499 __u8 attach_mode; 500 }; 501 502 struct bpf_xdp_set_link_opts { 503 size_t sz; 504 int old_fd; 505 }; 506 #define bpf_xdp_set_link_opts__last_field old_fd 507 508 LIBBPF_API int bpf_set_link_xdp_fd(int ifindex, int fd, __u32 flags); 509 LIBBPF_API int bpf_set_link_xdp_fd_opts(int ifindex, int fd, __u32 flags, 510 const struct bpf_xdp_set_link_opts *opts); 511 LIBBPF_API int bpf_get_link_xdp_id(int ifindex, __u32 *prog_id, __u32 flags); 512 LIBBPF_API int bpf_get_link_xdp_info(int ifindex, struct xdp_link_info *info, 513 size_t info_size, __u32 flags); 514 515 /* Ring buffer APIs */ 516 struct ring_buffer; 517 518 typedef int (*ring_buffer_sample_fn)(void *ctx, void *data, size_t size); 519 520 struct ring_buffer_opts { 521 size_t sz; /* size of this struct, for forward/backward compatiblity */ 522 }; 523 524 #define ring_buffer_opts__last_field sz 525 526 LIBBPF_API struct ring_buffer * 527 ring_buffer__new(int map_fd, ring_buffer_sample_fn sample_cb, void *ctx, 528 const struct ring_buffer_opts *opts); 529 LIBBPF_API void ring_buffer__free(struct ring_buffer *rb); 530 LIBBPF_API int ring_buffer__add(struct ring_buffer *rb, int map_fd, 531 ring_buffer_sample_fn sample_cb, void *ctx); 532 LIBBPF_API int ring_buffer__poll(struct ring_buffer *rb, int timeout_ms); 533 LIBBPF_API int ring_buffer__consume(struct ring_buffer *rb); 534 535 /* Perf buffer APIs */ 536 struct perf_buffer; 537 538 typedef void (*perf_buffer_sample_fn)(void *ctx, int cpu, 539 void *data, __u32 size); 540 typedef void (*perf_buffer_lost_fn)(void *ctx, int cpu, __u64 cnt); 541 542 /* common use perf buffer options */ 543 struct perf_buffer_opts { 544 /* if specified, sample_cb is called for each sample */ 545 perf_buffer_sample_fn sample_cb; 546 /* if specified, lost_cb is called for each batch of lost samples */ 547 perf_buffer_lost_fn lost_cb; 548 /* ctx is provided to sample_cb and lost_cb */ 549 void *ctx; 550 }; 551 552 LIBBPF_API struct perf_buffer * 553 perf_buffer__new(int map_fd, size_t page_cnt, 554 const struct perf_buffer_opts *opts); 555 556 enum bpf_perf_event_ret { 557 LIBBPF_PERF_EVENT_DONE = 0, 558 LIBBPF_PERF_EVENT_ERROR = -1, 559 LIBBPF_PERF_EVENT_CONT = -2, 560 }; 561 562 struct perf_event_header; 563 564 typedef enum bpf_perf_event_ret 565 (*perf_buffer_event_fn)(void *ctx, int cpu, struct perf_event_header *event); 566 567 /* raw perf buffer options, giving most power and control */ 568 struct perf_buffer_raw_opts { 569 /* perf event attrs passed directly into perf_event_open() */ 570 struct perf_event_attr *attr; 571 /* raw event callback */ 572 perf_buffer_event_fn event_cb; 573 /* ctx is provided to event_cb */ 574 void *ctx; 575 /* if cpu_cnt == 0, open all on all possible CPUs (up to the number of 576 * max_entries of given PERF_EVENT_ARRAY map) 577 */ 578 int cpu_cnt; 579 /* if cpu_cnt > 0, cpus is an array of CPUs to open ring buffers on */ 580 int *cpus; 581 /* if cpu_cnt > 0, map_keys specify map keys to set per-CPU FDs for */ 582 int *map_keys; 583 }; 584 585 LIBBPF_API struct perf_buffer * 586 perf_buffer__new_raw(int map_fd, size_t page_cnt, 587 const struct perf_buffer_raw_opts *opts); 588 589 LIBBPF_API void perf_buffer__free(struct perf_buffer *pb); 590 LIBBPF_API int perf_buffer__poll(struct perf_buffer *pb, int timeout_ms); 591 LIBBPF_API int perf_buffer__consume(struct perf_buffer *pb); 592 593 typedef enum bpf_perf_event_ret 594 (*bpf_perf_event_print_t)(struct perf_event_header *hdr, 595 void *private_data); 596 LIBBPF_API enum bpf_perf_event_ret 597 bpf_perf_event_read_simple(void *mmap_mem, size_t mmap_size, size_t page_size, 598 void **copy_mem, size_t *copy_size, 599 bpf_perf_event_print_t fn, void *private_data); 600 601 struct bpf_prog_linfo; 602 struct bpf_prog_info; 603 604 LIBBPF_API void bpf_prog_linfo__free(struct bpf_prog_linfo *prog_linfo); 605 LIBBPF_API struct bpf_prog_linfo * 606 bpf_prog_linfo__new(const struct bpf_prog_info *info); 607 LIBBPF_API const struct bpf_line_info * 608 bpf_prog_linfo__lfind_addr_func(const struct bpf_prog_linfo *prog_linfo, 609 __u64 addr, __u32 func_idx, __u32 nr_skip); 610 LIBBPF_API const struct bpf_line_info * 611 bpf_prog_linfo__lfind(const struct bpf_prog_linfo *prog_linfo, 612 __u32 insn_off, __u32 nr_skip); 613 614 /* 615 * Probe for supported system features 616 * 617 * Note that running many of these probes in a short amount of time can cause 618 * the kernel to reach the maximal size of lockable memory allowed for the 619 * user, causing subsequent probes to fail. In this case, the caller may want 620 * to adjust that limit with setrlimit(). 621 */ 622 LIBBPF_API bool bpf_probe_prog_type(enum bpf_prog_type prog_type, 623 __u32 ifindex); 624 LIBBPF_API bool bpf_probe_map_type(enum bpf_map_type map_type, __u32 ifindex); 625 LIBBPF_API bool bpf_probe_helper(enum bpf_func_id id, 626 enum bpf_prog_type prog_type, __u32 ifindex); 627 LIBBPF_API bool bpf_probe_large_insn_limit(__u32 ifindex); 628 629 /* 630 * Get bpf_prog_info in continuous memory 631 * 632 * struct bpf_prog_info has multiple arrays. The user has option to choose 633 * arrays to fetch from kernel. The following APIs provide an uniform way to 634 * fetch these data. All arrays in bpf_prog_info are stored in a single 635 * continuous memory region. This makes it easy to store the info in a 636 * file. 637 * 638 * Before writing bpf_prog_info_linear to files, it is necessary to 639 * translate pointers in bpf_prog_info to offsets. Helper functions 640 * bpf_program__bpil_addr_to_offs() and bpf_program__bpil_offs_to_addr() 641 * are introduced to switch between pointers and offsets. 642 * 643 * Examples: 644 * # To fetch map_ids and prog_tags: 645 * __u64 arrays = (1UL << BPF_PROG_INFO_MAP_IDS) | 646 * (1UL << BPF_PROG_INFO_PROG_TAGS); 647 * struct bpf_prog_info_linear *info_linear = 648 * bpf_program__get_prog_info_linear(fd, arrays); 649 * 650 * # To save data in file 651 * bpf_program__bpil_addr_to_offs(info_linear); 652 * write(f, info_linear, sizeof(*info_linear) + info_linear->data_len); 653 * 654 * # To read data from file 655 * read(f, info_linear, <proper_size>); 656 * bpf_program__bpil_offs_to_addr(info_linear); 657 */ 658 enum bpf_prog_info_array { 659 BPF_PROG_INFO_FIRST_ARRAY = 0, 660 BPF_PROG_INFO_JITED_INSNS = 0, 661 BPF_PROG_INFO_XLATED_INSNS, 662 BPF_PROG_INFO_MAP_IDS, 663 BPF_PROG_INFO_JITED_KSYMS, 664 BPF_PROG_INFO_JITED_FUNC_LENS, 665 BPF_PROG_INFO_FUNC_INFO, 666 BPF_PROG_INFO_LINE_INFO, 667 BPF_PROG_INFO_JITED_LINE_INFO, 668 BPF_PROG_INFO_PROG_TAGS, 669 BPF_PROG_INFO_LAST_ARRAY, 670 }; 671 672 struct bpf_prog_info_linear { 673 /* size of struct bpf_prog_info, when the tool is compiled */ 674 __u32 info_len; 675 /* total bytes allocated for data, round up to 8 bytes */ 676 __u32 data_len; 677 /* which arrays are included in data */ 678 __u64 arrays; 679 struct bpf_prog_info info; 680 __u8 data[]; 681 }; 682 683 LIBBPF_API struct bpf_prog_info_linear * 684 bpf_program__get_prog_info_linear(int fd, __u64 arrays); 685 686 LIBBPF_API void 687 bpf_program__bpil_addr_to_offs(struct bpf_prog_info_linear *info_linear); 688 689 LIBBPF_API void 690 bpf_program__bpil_offs_to_addr(struct bpf_prog_info_linear *info_linear); 691 692 /* 693 * A helper function to get the number of possible CPUs before looking up 694 * per-CPU maps. Negative errno is returned on failure. 695 * 696 * Example usage: 697 * 698 * int ncpus = libbpf_num_possible_cpus(); 699 * if (ncpus < 0) { 700 * // error handling 701 * } 702 * long values[ncpus]; 703 * bpf_map_lookup_elem(per_cpu_map_fd, key, values); 704 * 705 */ 706 LIBBPF_API int libbpf_num_possible_cpus(void); 707 708 struct bpf_map_skeleton { 709 const char *name; 710 struct bpf_map **map; 711 void **mmaped; 712 }; 713 714 struct bpf_prog_skeleton { 715 const char *name; 716 struct bpf_program **prog; 717 struct bpf_link **link; 718 }; 719 720 struct bpf_object_skeleton { 721 size_t sz; /* size of this struct, for forward/backward compatibility */ 722 723 const char *name; 724 void *data; 725 size_t data_sz; 726 727 struct bpf_object **obj; 728 729 int map_cnt; 730 int map_skel_sz; /* sizeof(struct bpf_skeleton_map) */ 731 struct bpf_map_skeleton *maps; 732 733 int prog_cnt; 734 int prog_skel_sz; /* sizeof(struct bpf_skeleton_prog) */ 735 struct bpf_prog_skeleton *progs; 736 }; 737 738 LIBBPF_API int 739 bpf_object__open_skeleton(struct bpf_object_skeleton *s, 740 const struct bpf_object_open_opts *opts); 741 LIBBPF_API int bpf_object__load_skeleton(struct bpf_object_skeleton *s); 742 LIBBPF_API int bpf_object__attach_skeleton(struct bpf_object_skeleton *s); 743 LIBBPF_API void bpf_object__detach_skeleton(struct bpf_object_skeleton *s); 744 LIBBPF_API void bpf_object__destroy_skeleton(struct bpf_object_skeleton *s); 745 746 enum libbpf_tristate { 747 TRI_NO = 0, 748 TRI_YES = 1, 749 TRI_MODULE = 2, 750 }; 751 752 #ifdef __cplusplus 753 } /* extern "C" */ 754 #endif 755 756 #endif /* __LIBBPF_LIBBPF_H */ 757