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 union bpf_iter_link_info *link_info; 271 __u32 link_info_len; 272 }; 273 #define bpf_iter_attach_opts__last_field link_info_len 274 275 LIBBPF_API struct bpf_link * 276 bpf_program__attach_iter(struct bpf_program *prog, 277 const struct bpf_iter_attach_opts *opts); 278 279 struct bpf_insn; 280 281 /* 282 * Libbpf allows callers to adjust BPF programs before being loaded 283 * into kernel. One program in an object file can be transformed into 284 * multiple variants to be attached to different hooks. 285 * 286 * bpf_program_prep_t, bpf_program__set_prep and bpf_program__nth_fd 287 * form an API for this purpose. 288 * 289 * - bpf_program_prep_t: 290 * Defines a 'preprocessor', which is a caller defined function 291 * passed to libbpf through bpf_program__set_prep(), and will be 292 * called before program is loaded. The processor should adjust 293 * the program one time for each instance according to the instance id 294 * passed to it. 295 * 296 * - bpf_program__set_prep: 297 * Attaches a preprocessor to a BPF program. The number of instances 298 * that should be created is also passed through this function. 299 * 300 * - bpf_program__nth_fd: 301 * After the program is loaded, get resulting FD of a given instance 302 * of the BPF program. 303 * 304 * If bpf_program__set_prep() is not used, the program would be loaded 305 * without adjustment during bpf_object__load(). The program has only 306 * one instance. In this case bpf_program__fd(prog) is equal to 307 * bpf_program__nth_fd(prog, 0). 308 */ 309 310 struct bpf_prog_prep_result { 311 /* 312 * If not NULL, load new instruction array. 313 * If set to NULL, don't load this instance. 314 */ 315 struct bpf_insn *new_insn_ptr; 316 int new_insn_cnt; 317 318 /* If not NULL, result FD is written to it. */ 319 int *pfd; 320 }; 321 322 /* 323 * Parameters of bpf_program_prep_t: 324 * - prog: The bpf_program being loaded. 325 * - n: Index of instance being generated. 326 * - insns: BPF instructions array. 327 * - insns_cnt:Number of instructions in insns. 328 * - res: Output parameter, result of transformation. 329 * 330 * Return value: 331 * - Zero: pre-processing success. 332 * - Non-zero: pre-processing error, stop loading. 333 */ 334 typedef int (*bpf_program_prep_t)(struct bpf_program *prog, int n, 335 struct bpf_insn *insns, int insns_cnt, 336 struct bpf_prog_prep_result *res); 337 338 LIBBPF_API int bpf_program__set_prep(struct bpf_program *prog, int nr_instance, 339 bpf_program_prep_t prep); 340 341 LIBBPF_API int bpf_program__nth_fd(const struct bpf_program *prog, int n); 342 343 /* 344 * Adjust type of BPF program. Default is kprobe. 345 */ 346 LIBBPF_API int bpf_program__set_socket_filter(struct bpf_program *prog); 347 LIBBPF_API int bpf_program__set_tracepoint(struct bpf_program *prog); 348 LIBBPF_API int bpf_program__set_raw_tracepoint(struct bpf_program *prog); 349 LIBBPF_API int bpf_program__set_kprobe(struct bpf_program *prog); 350 LIBBPF_API int bpf_program__set_lsm(struct bpf_program *prog); 351 LIBBPF_API int bpf_program__set_sched_cls(struct bpf_program *prog); 352 LIBBPF_API int bpf_program__set_sched_act(struct bpf_program *prog); 353 LIBBPF_API int bpf_program__set_xdp(struct bpf_program *prog); 354 LIBBPF_API int bpf_program__set_perf_event(struct bpf_program *prog); 355 LIBBPF_API int bpf_program__set_tracing(struct bpf_program *prog); 356 LIBBPF_API int bpf_program__set_struct_ops(struct bpf_program *prog); 357 LIBBPF_API int bpf_program__set_extension(struct bpf_program *prog); 358 LIBBPF_API int bpf_program__set_sk_lookup(struct bpf_program *prog); 359 360 LIBBPF_API enum bpf_prog_type bpf_program__get_type(struct bpf_program *prog); 361 LIBBPF_API void bpf_program__set_type(struct bpf_program *prog, 362 enum bpf_prog_type type); 363 364 LIBBPF_API enum bpf_attach_type 365 bpf_program__get_expected_attach_type(struct bpf_program *prog); 366 LIBBPF_API void 367 bpf_program__set_expected_attach_type(struct bpf_program *prog, 368 enum bpf_attach_type type); 369 370 LIBBPF_API int 371 bpf_program__set_attach_target(struct bpf_program *prog, int attach_prog_fd, 372 const char *attach_func_name); 373 374 LIBBPF_API bool bpf_program__is_socket_filter(const struct bpf_program *prog); 375 LIBBPF_API bool bpf_program__is_tracepoint(const struct bpf_program *prog); 376 LIBBPF_API bool bpf_program__is_raw_tracepoint(const struct bpf_program *prog); 377 LIBBPF_API bool bpf_program__is_kprobe(const struct bpf_program *prog); 378 LIBBPF_API bool bpf_program__is_lsm(const struct bpf_program *prog); 379 LIBBPF_API bool bpf_program__is_sched_cls(const struct bpf_program *prog); 380 LIBBPF_API bool bpf_program__is_sched_act(const struct bpf_program *prog); 381 LIBBPF_API bool bpf_program__is_xdp(const struct bpf_program *prog); 382 LIBBPF_API bool bpf_program__is_perf_event(const struct bpf_program *prog); 383 LIBBPF_API bool bpf_program__is_tracing(const struct bpf_program *prog); 384 LIBBPF_API bool bpf_program__is_struct_ops(const struct bpf_program *prog); 385 LIBBPF_API bool bpf_program__is_extension(const struct bpf_program *prog); 386 LIBBPF_API bool bpf_program__is_sk_lookup(const struct bpf_program *prog); 387 388 /* 389 * No need for __attribute__((packed)), all members of 'bpf_map_def' 390 * are all aligned. In addition, using __attribute__((packed)) 391 * would trigger a -Wpacked warning message, and lead to an error 392 * if -Werror is set. 393 */ 394 struct bpf_map_def { 395 unsigned int type; 396 unsigned int key_size; 397 unsigned int value_size; 398 unsigned int max_entries; 399 unsigned int map_flags; 400 }; 401 402 /* 403 * The 'struct bpf_map' in include/linux/bpf.h is internal to the kernel, 404 * so no need to worry about a name clash. 405 */ 406 LIBBPF_API struct bpf_map * 407 bpf_object__find_map_by_name(const struct bpf_object *obj, const char *name); 408 409 LIBBPF_API int 410 bpf_object__find_map_fd_by_name(const struct bpf_object *obj, const char *name); 411 412 /* 413 * Get bpf_map through the offset of corresponding struct bpf_map_def 414 * in the BPF object file. 415 */ 416 LIBBPF_API struct bpf_map * 417 bpf_object__find_map_by_offset(struct bpf_object *obj, size_t offset); 418 419 LIBBPF_API struct bpf_map * 420 bpf_map__next(const struct bpf_map *map, const struct bpf_object *obj); 421 #define bpf_object__for_each_map(pos, obj) \ 422 for ((pos) = bpf_map__next(NULL, (obj)); \ 423 (pos) != NULL; \ 424 (pos) = bpf_map__next((pos), (obj))) 425 #define bpf_map__for_each bpf_object__for_each_map 426 427 LIBBPF_API struct bpf_map * 428 bpf_map__prev(const struct bpf_map *map, const struct bpf_object *obj); 429 430 /* get/set map FD */ 431 LIBBPF_API int bpf_map__fd(const struct bpf_map *map); 432 LIBBPF_API int bpf_map__reuse_fd(struct bpf_map *map, int fd); 433 /* get map definition */ 434 LIBBPF_API const struct bpf_map_def *bpf_map__def(const struct bpf_map *map); 435 /* get map name */ 436 LIBBPF_API const char *bpf_map__name(const struct bpf_map *map); 437 /* get/set map type */ 438 LIBBPF_API enum bpf_map_type bpf_map__type(const struct bpf_map *map); 439 LIBBPF_API int bpf_map__set_type(struct bpf_map *map, enum bpf_map_type type); 440 /* get/set map size (max_entries) */ 441 LIBBPF_API __u32 bpf_map__max_entries(const struct bpf_map *map); 442 LIBBPF_API int bpf_map__set_max_entries(struct bpf_map *map, __u32 max_entries); 443 LIBBPF_API int bpf_map__resize(struct bpf_map *map, __u32 max_entries); 444 /* get/set map flags */ 445 LIBBPF_API __u32 bpf_map__map_flags(const struct bpf_map *map); 446 LIBBPF_API int bpf_map__set_map_flags(struct bpf_map *map, __u32 flags); 447 /* get/set map NUMA node */ 448 LIBBPF_API __u32 bpf_map__numa_node(const struct bpf_map *map); 449 LIBBPF_API int bpf_map__set_numa_node(struct bpf_map *map, __u32 numa_node); 450 /* get/set map key size */ 451 LIBBPF_API __u32 bpf_map__key_size(const struct bpf_map *map); 452 LIBBPF_API int bpf_map__set_key_size(struct bpf_map *map, __u32 size); 453 /* get/set map value size */ 454 LIBBPF_API __u32 bpf_map__value_size(const struct bpf_map *map); 455 LIBBPF_API int bpf_map__set_value_size(struct bpf_map *map, __u32 size); 456 /* get map key/value BTF type IDs */ 457 LIBBPF_API __u32 bpf_map__btf_key_type_id(const struct bpf_map *map); 458 LIBBPF_API __u32 bpf_map__btf_value_type_id(const struct bpf_map *map); 459 /* get/set map if_index */ 460 LIBBPF_API __u32 bpf_map__ifindex(const struct bpf_map *map); 461 LIBBPF_API int bpf_map__set_ifindex(struct bpf_map *map, __u32 ifindex); 462 463 typedef void (*bpf_map_clear_priv_t)(struct bpf_map *, void *); 464 LIBBPF_API int bpf_map__set_priv(struct bpf_map *map, void *priv, 465 bpf_map_clear_priv_t clear_priv); 466 LIBBPF_API void *bpf_map__priv(const struct bpf_map *map); 467 LIBBPF_API int bpf_map__set_initial_value(struct bpf_map *map, 468 const void *data, size_t size); 469 LIBBPF_API bool bpf_map__is_offload_neutral(const struct bpf_map *map); 470 LIBBPF_API bool bpf_map__is_internal(const struct bpf_map *map); 471 LIBBPF_API int bpf_map__set_pin_path(struct bpf_map *map, const char *path); 472 LIBBPF_API const char *bpf_map__get_pin_path(const struct bpf_map *map); 473 LIBBPF_API bool bpf_map__is_pinned(const struct bpf_map *map); 474 LIBBPF_API int bpf_map__pin(struct bpf_map *map, const char *path); 475 LIBBPF_API int bpf_map__unpin(struct bpf_map *map, const char *path); 476 477 LIBBPF_API int bpf_map__set_inner_map_fd(struct bpf_map *map, int fd); 478 479 LIBBPF_API long libbpf_get_error(const void *ptr); 480 481 struct bpf_prog_load_attr { 482 const char *file; 483 enum bpf_prog_type prog_type; 484 enum bpf_attach_type expected_attach_type; 485 int ifindex; 486 int log_level; 487 int prog_flags; 488 }; 489 490 LIBBPF_API int bpf_prog_load_xattr(const struct bpf_prog_load_attr *attr, 491 struct bpf_object **pobj, int *prog_fd); 492 LIBBPF_API int bpf_prog_load(const char *file, enum bpf_prog_type type, 493 struct bpf_object **pobj, int *prog_fd); 494 495 struct xdp_link_info { 496 __u32 prog_id; 497 __u32 drv_prog_id; 498 __u32 hw_prog_id; 499 __u32 skb_prog_id; 500 __u8 attach_mode; 501 }; 502 503 struct bpf_xdp_set_link_opts { 504 size_t sz; 505 int old_fd; 506 }; 507 #define bpf_xdp_set_link_opts__last_field old_fd 508 509 LIBBPF_API int bpf_set_link_xdp_fd(int ifindex, int fd, __u32 flags); 510 LIBBPF_API int bpf_set_link_xdp_fd_opts(int ifindex, int fd, __u32 flags, 511 const struct bpf_xdp_set_link_opts *opts); 512 LIBBPF_API int bpf_get_link_xdp_id(int ifindex, __u32 *prog_id, __u32 flags); 513 LIBBPF_API int bpf_get_link_xdp_info(int ifindex, struct xdp_link_info *info, 514 size_t info_size, __u32 flags); 515 516 /* Ring buffer APIs */ 517 struct ring_buffer; 518 519 typedef int (*ring_buffer_sample_fn)(void *ctx, void *data, size_t size); 520 521 struct ring_buffer_opts { 522 size_t sz; /* size of this struct, for forward/backward compatiblity */ 523 }; 524 525 #define ring_buffer_opts__last_field sz 526 527 LIBBPF_API struct ring_buffer * 528 ring_buffer__new(int map_fd, ring_buffer_sample_fn sample_cb, void *ctx, 529 const struct ring_buffer_opts *opts); 530 LIBBPF_API void ring_buffer__free(struct ring_buffer *rb); 531 LIBBPF_API int ring_buffer__add(struct ring_buffer *rb, int map_fd, 532 ring_buffer_sample_fn sample_cb, void *ctx); 533 LIBBPF_API int ring_buffer__poll(struct ring_buffer *rb, int timeout_ms); 534 LIBBPF_API int ring_buffer__consume(struct ring_buffer *rb); 535 536 /* Perf buffer APIs */ 537 struct perf_buffer; 538 539 typedef void (*perf_buffer_sample_fn)(void *ctx, int cpu, 540 void *data, __u32 size); 541 typedef void (*perf_buffer_lost_fn)(void *ctx, int cpu, __u64 cnt); 542 543 /* common use perf buffer options */ 544 struct perf_buffer_opts { 545 /* if specified, sample_cb is called for each sample */ 546 perf_buffer_sample_fn sample_cb; 547 /* if specified, lost_cb is called for each batch of lost samples */ 548 perf_buffer_lost_fn lost_cb; 549 /* ctx is provided to sample_cb and lost_cb */ 550 void *ctx; 551 }; 552 553 LIBBPF_API struct perf_buffer * 554 perf_buffer__new(int map_fd, size_t page_cnt, 555 const struct perf_buffer_opts *opts); 556 557 enum bpf_perf_event_ret { 558 LIBBPF_PERF_EVENT_DONE = 0, 559 LIBBPF_PERF_EVENT_ERROR = -1, 560 LIBBPF_PERF_EVENT_CONT = -2, 561 }; 562 563 struct perf_event_header; 564 565 typedef enum bpf_perf_event_ret 566 (*perf_buffer_event_fn)(void *ctx, int cpu, struct perf_event_header *event); 567 568 /* raw perf buffer options, giving most power and control */ 569 struct perf_buffer_raw_opts { 570 /* perf event attrs passed directly into perf_event_open() */ 571 struct perf_event_attr *attr; 572 /* raw event callback */ 573 perf_buffer_event_fn event_cb; 574 /* ctx is provided to event_cb */ 575 void *ctx; 576 /* if cpu_cnt == 0, open all on all possible CPUs (up to the number of 577 * max_entries of given PERF_EVENT_ARRAY map) 578 */ 579 int cpu_cnt; 580 /* if cpu_cnt > 0, cpus is an array of CPUs to open ring buffers on */ 581 int *cpus; 582 /* if cpu_cnt > 0, map_keys specify map keys to set per-CPU FDs for */ 583 int *map_keys; 584 }; 585 586 LIBBPF_API struct perf_buffer * 587 perf_buffer__new_raw(int map_fd, size_t page_cnt, 588 const struct perf_buffer_raw_opts *opts); 589 590 LIBBPF_API void perf_buffer__free(struct perf_buffer *pb); 591 LIBBPF_API int perf_buffer__poll(struct perf_buffer *pb, int timeout_ms); 592 LIBBPF_API int perf_buffer__consume(struct perf_buffer *pb); 593 594 typedef enum bpf_perf_event_ret 595 (*bpf_perf_event_print_t)(struct perf_event_header *hdr, 596 void *private_data); 597 LIBBPF_API enum bpf_perf_event_ret 598 bpf_perf_event_read_simple(void *mmap_mem, size_t mmap_size, size_t page_size, 599 void **copy_mem, size_t *copy_size, 600 bpf_perf_event_print_t fn, void *private_data); 601 602 struct bpf_prog_linfo; 603 struct bpf_prog_info; 604 605 LIBBPF_API void bpf_prog_linfo__free(struct bpf_prog_linfo *prog_linfo); 606 LIBBPF_API struct bpf_prog_linfo * 607 bpf_prog_linfo__new(const struct bpf_prog_info *info); 608 LIBBPF_API const struct bpf_line_info * 609 bpf_prog_linfo__lfind_addr_func(const struct bpf_prog_linfo *prog_linfo, 610 __u64 addr, __u32 func_idx, __u32 nr_skip); 611 LIBBPF_API const struct bpf_line_info * 612 bpf_prog_linfo__lfind(const struct bpf_prog_linfo *prog_linfo, 613 __u32 insn_off, __u32 nr_skip); 614 615 /* 616 * Probe for supported system features 617 * 618 * Note that running many of these probes in a short amount of time can cause 619 * the kernel to reach the maximal size of lockable memory allowed for the 620 * user, causing subsequent probes to fail. In this case, the caller may want 621 * to adjust that limit with setrlimit(). 622 */ 623 LIBBPF_API bool bpf_probe_prog_type(enum bpf_prog_type prog_type, 624 __u32 ifindex); 625 LIBBPF_API bool bpf_probe_map_type(enum bpf_map_type map_type, __u32 ifindex); 626 LIBBPF_API bool bpf_probe_helper(enum bpf_func_id id, 627 enum bpf_prog_type prog_type, __u32 ifindex); 628 LIBBPF_API bool bpf_probe_large_insn_limit(__u32 ifindex); 629 630 /* 631 * Get bpf_prog_info in continuous memory 632 * 633 * struct bpf_prog_info has multiple arrays. The user has option to choose 634 * arrays to fetch from kernel. The following APIs provide an uniform way to 635 * fetch these data. All arrays in bpf_prog_info are stored in a single 636 * continuous memory region. This makes it easy to store the info in a 637 * file. 638 * 639 * Before writing bpf_prog_info_linear to files, it is necessary to 640 * translate pointers in bpf_prog_info to offsets. Helper functions 641 * bpf_program__bpil_addr_to_offs() and bpf_program__bpil_offs_to_addr() 642 * are introduced to switch between pointers and offsets. 643 * 644 * Examples: 645 * # To fetch map_ids and prog_tags: 646 * __u64 arrays = (1UL << BPF_PROG_INFO_MAP_IDS) | 647 * (1UL << BPF_PROG_INFO_PROG_TAGS); 648 * struct bpf_prog_info_linear *info_linear = 649 * bpf_program__get_prog_info_linear(fd, arrays); 650 * 651 * # To save data in file 652 * bpf_program__bpil_addr_to_offs(info_linear); 653 * write(f, info_linear, sizeof(*info_linear) + info_linear->data_len); 654 * 655 * # To read data from file 656 * read(f, info_linear, <proper_size>); 657 * bpf_program__bpil_offs_to_addr(info_linear); 658 */ 659 enum bpf_prog_info_array { 660 BPF_PROG_INFO_FIRST_ARRAY = 0, 661 BPF_PROG_INFO_JITED_INSNS = 0, 662 BPF_PROG_INFO_XLATED_INSNS, 663 BPF_PROG_INFO_MAP_IDS, 664 BPF_PROG_INFO_JITED_KSYMS, 665 BPF_PROG_INFO_JITED_FUNC_LENS, 666 BPF_PROG_INFO_FUNC_INFO, 667 BPF_PROG_INFO_LINE_INFO, 668 BPF_PROG_INFO_JITED_LINE_INFO, 669 BPF_PROG_INFO_PROG_TAGS, 670 BPF_PROG_INFO_LAST_ARRAY, 671 }; 672 673 struct bpf_prog_info_linear { 674 /* size of struct bpf_prog_info, when the tool is compiled */ 675 __u32 info_len; 676 /* total bytes allocated for data, round up to 8 bytes */ 677 __u32 data_len; 678 /* which arrays are included in data */ 679 __u64 arrays; 680 struct bpf_prog_info info; 681 __u8 data[]; 682 }; 683 684 LIBBPF_API struct bpf_prog_info_linear * 685 bpf_program__get_prog_info_linear(int fd, __u64 arrays); 686 687 LIBBPF_API void 688 bpf_program__bpil_addr_to_offs(struct bpf_prog_info_linear *info_linear); 689 690 LIBBPF_API void 691 bpf_program__bpil_offs_to_addr(struct bpf_prog_info_linear *info_linear); 692 693 /* 694 * A helper function to get the number of possible CPUs before looking up 695 * per-CPU maps. Negative errno is returned on failure. 696 * 697 * Example usage: 698 * 699 * int ncpus = libbpf_num_possible_cpus(); 700 * if (ncpus < 0) { 701 * // error handling 702 * } 703 * long values[ncpus]; 704 * bpf_map_lookup_elem(per_cpu_map_fd, key, values); 705 * 706 */ 707 LIBBPF_API int libbpf_num_possible_cpus(void); 708 709 struct bpf_map_skeleton { 710 const char *name; 711 struct bpf_map **map; 712 void **mmaped; 713 }; 714 715 struct bpf_prog_skeleton { 716 const char *name; 717 struct bpf_program **prog; 718 struct bpf_link **link; 719 }; 720 721 struct bpf_object_skeleton { 722 size_t sz; /* size of this struct, for forward/backward compatibility */ 723 724 const char *name; 725 void *data; 726 size_t data_sz; 727 728 struct bpf_object **obj; 729 730 int map_cnt; 731 int map_skel_sz; /* sizeof(struct bpf_skeleton_map) */ 732 struct bpf_map_skeleton *maps; 733 734 int prog_cnt; 735 int prog_skel_sz; /* sizeof(struct bpf_skeleton_prog) */ 736 struct bpf_prog_skeleton *progs; 737 }; 738 739 LIBBPF_API int 740 bpf_object__open_skeleton(struct bpf_object_skeleton *s, 741 const struct bpf_object_open_opts *opts); 742 LIBBPF_API int bpf_object__load_skeleton(struct bpf_object_skeleton *s); 743 LIBBPF_API int bpf_object__attach_skeleton(struct bpf_object_skeleton *s); 744 LIBBPF_API void bpf_object__detach_skeleton(struct bpf_object_skeleton *s); 745 LIBBPF_API void bpf_object__destroy_skeleton(struct bpf_object_skeleton *s); 746 747 enum libbpf_tristate { 748 TRI_NO = 0, 749 TRI_YES = 1, 750 TRI_MODULE = 2, 751 }; 752 753 #ifdef __cplusplus 754 } /* extern "C" */ 755 #endif 756 757 #endif /* __LIBBPF_LIBBPF_H */ 758