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 #include "libbpf_legacy.h" 22 23 #ifdef __cplusplus 24 extern "C" { 25 #endif 26 27 LIBBPF_API __u32 libbpf_major_version(void); 28 LIBBPF_API __u32 libbpf_minor_version(void); 29 LIBBPF_API const char *libbpf_version_string(void); 30 31 enum libbpf_errno { 32 __LIBBPF_ERRNO__START = 4000, 33 34 /* Something wrong in libelf */ 35 LIBBPF_ERRNO__LIBELF = __LIBBPF_ERRNO__START, 36 LIBBPF_ERRNO__FORMAT, /* BPF object format invalid */ 37 LIBBPF_ERRNO__KVERSION, /* Incorrect or no 'version' section */ 38 LIBBPF_ERRNO__ENDIAN, /* Endian mismatch */ 39 LIBBPF_ERRNO__INTERNAL, /* Internal error in libbpf */ 40 LIBBPF_ERRNO__RELOC, /* Relocation failed */ 41 LIBBPF_ERRNO__LOAD, /* Load program failure for unknown reason */ 42 LIBBPF_ERRNO__VERIFY, /* Kernel verifier blocks program loading */ 43 LIBBPF_ERRNO__PROG2BIG, /* Program too big */ 44 LIBBPF_ERRNO__KVER, /* Incorrect kernel version */ 45 LIBBPF_ERRNO__PROGTYPE, /* Kernel doesn't support this program type */ 46 LIBBPF_ERRNO__WRNGPID, /* Wrong pid in netlink message */ 47 LIBBPF_ERRNO__INVSEQ, /* Invalid netlink sequence */ 48 LIBBPF_ERRNO__NLPARSE, /* netlink parsing error */ 49 __LIBBPF_ERRNO__END, 50 }; 51 52 LIBBPF_API int libbpf_strerror(int err, char *buf, size_t size); 53 54 enum libbpf_print_level { 55 LIBBPF_WARN, 56 LIBBPF_INFO, 57 LIBBPF_DEBUG, 58 }; 59 60 typedef int (*libbpf_print_fn_t)(enum libbpf_print_level level, 61 const char *, va_list ap); 62 63 LIBBPF_API libbpf_print_fn_t libbpf_set_print(libbpf_print_fn_t fn); 64 65 /* Hide internal to user */ 66 struct bpf_object; 67 68 struct bpf_object_open_attr { 69 const char *file; 70 enum bpf_prog_type prog_type; 71 }; 72 73 struct bpf_object_open_opts { 74 /* size of this struct, for forward/backward compatiblity */ 75 size_t sz; 76 /* object name override, if provided: 77 * - for object open from file, this will override setting object 78 * name from file path's base name; 79 * - for object open from memory buffer, this will specify an object 80 * name and will override default "<addr>-<buf-size>" name; 81 */ 82 const char *object_name; 83 /* parse map definitions non-strictly, allowing extra attributes/data */ 84 bool relaxed_maps; 85 /* DEPRECATED: handle CO-RE relocations non-strictly, allowing failures. 86 * Value is ignored. Relocations always are processed non-strictly. 87 * Non-relocatable instructions are replaced with invalid ones to 88 * prevent accidental errors. 89 * */ 90 LIBBPF_DEPRECATED_SINCE(0, 6, "field has no effect") 91 bool relaxed_core_relocs; 92 /* maps that set the 'pinning' attribute in their definition will have 93 * their pin_path attribute set to a file in this directory, and be 94 * auto-pinned to that path on load; defaults to "/sys/fs/bpf". 95 */ 96 const char *pin_root_path; 97 98 LIBBPF_DEPRECATED_SINCE(0, 7, "use bpf_program__set_attach_target() on each individual bpf_program") 99 __u32 attach_prog_fd; 100 /* Additional kernel config content that augments and overrides 101 * system Kconfig for CONFIG_xxx externs. 102 */ 103 const char *kconfig; 104 /* Path to the custom BTF to be used for BPF CO-RE relocations. 105 * This custom BTF completely replaces the use of vmlinux BTF 106 * for the purpose of CO-RE relocations. 107 * NOTE: any other BPF feature (e.g., fentry/fexit programs, 108 * struct_ops, etc) will need actual kernel BTF at /sys/kernel/btf/vmlinux. 109 */ 110 const char *btf_custom_path; 111 /* Pointer to a buffer for storing kernel logs for applicable BPF 112 * commands. Valid kernel_log_size has to be specified as well and are 113 * passed-through to bpf() syscall. Keep in mind that kernel might 114 * fail operation with -ENOSPC error if provided buffer is too small 115 * to contain entire log output. 116 * See the comment below for kernel_log_level for interaction between 117 * log_buf and log_level settings. 118 * 119 * If specified, this log buffer will be passed for: 120 * - each BPF progral load (BPF_PROG_LOAD) attempt, unless overriden 121 * with bpf_program__set_log() on per-program level, to get 122 * BPF verifier log output. 123 * - during BPF object's BTF load into kernel (BPF_BTF_LOAD) to get 124 * BTF sanity checking log. 125 * 126 * Each BPF command (BPF_BTF_LOAD or BPF_PROG_LOAD) will overwrite 127 * previous contents, so if you need more fine-grained control, set 128 * per-program buffer with bpf_program__set_log_buf() to preserve each 129 * individual program's verification log. Keep using kernel_log_buf 130 * for BTF verification log, if necessary. 131 */ 132 char *kernel_log_buf; 133 size_t kernel_log_size; 134 /* 135 * Log level can be set independently from log buffer. Log_level=0 136 * means that libbpf will attempt loading BTF or program without any 137 * logging requested, but will retry with either its own or custom log 138 * buffer, if provided, and log_level=1 on any error. 139 * And vice versa, setting log_level>0 will request BTF or prog 140 * loading with verbose log from the first attempt (and as such also 141 * for successfully loaded BTF or program), and the actual log buffer 142 * could be either libbpf's own auto-allocated log buffer, if 143 * kernel_log_buffer is NULL, or user-provided custom kernel_log_buf. 144 * If user didn't provide custom log buffer, libbpf will emit captured 145 * logs through its print callback. 146 */ 147 __u32 kernel_log_level; 148 149 size_t :0; 150 }; 151 #define bpf_object_open_opts__last_field kernel_log_level 152 153 LIBBPF_API struct bpf_object *bpf_object__open(const char *path); 154 155 /** 156 * @brief **bpf_object__open_file()** creates a bpf_object by opening 157 * the BPF ELF object file pointed to by the passed path and loading it 158 * into memory. 159 * @param path BPF object file path 160 * @param opts options for how to load the bpf object, this parameter is 161 * optional and can be set to NULL 162 * @return pointer to the new bpf_object; or NULL is returned on error, 163 * error code is stored in errno 164 */ 165 LIBBPF_API struct bpf_object * 166 bpf_object__open_file(const char *path, const struct bpf_object_open_opts *opts); 167 168 /** 169 * @brief **bpf_object__open_mem()** creates a bpf_object by reading 170 * the BPF objects raw bytes from a memory buffer containing a valid 171 * BPF ELF object file. 172 * @param obj_buf pointer to the buffer containing ELF file bytes 173 * @param obj_buf_sz number of bytes in the buffer 174 * @param opts options for how to load the bpf object 175 * @return pointer to the new bpf_object; or NULL is returned on error, 176 * error code is stored in errno 177 */ 178 LIBBPF_API struct bpf_object * 179 bpf_object__open_mem(const void *obj_buf, size_t obj_buf_sz, 180 const struct bpf_object_open_opts *opts); 181 182 /* deprecated bpf_object__open variants */ 183 LIBBPF_API struct bpf_object * 184 bpf_object__open_buffer(const void *obj_buf, size_t obj_buf_sz, 185 const char *name); 186 LIBBPF_API struct bpf_object * 187 bpf_object__open_xattr(struct bpf_object_open_attr *attr); 188 189 enum libbpf_pin_type { 190 LIBBPF_PIN_NONE, 191 /* PIN_BY_NAME: pin maps by name (in /sys/fs/bpf by default) */ 192 LIBBPF_PIN_BY_NAME, 193 }; 194 195 /* pin_maps and unpin_maps can both be called with a NULL path, in which case 196 * they will use the pin_path attribute of each map (and ignore all maps that 197 * don't have a pin_path set). 198 */ 199 LIBBPF_API int bpf_object__pin_maps(struct bpf_object *obj, const char *path); 200 LIBBPF_API int bpf_object__unpin_maps(struct bpf_object *obj, 201 const char *path); 202 LIBBPF_API int bpf_object__pin_programs(struct bpf_object *obj, 203 const char *path); 204 LIBBPF_API int bpf_object__unpin_programs(struct bpf_object *obj, 205 const char *path); 206 LIBBPF_API int bpf_object__pin(struct bpf_object *object, const char *path); 207 LIBBPF_API void bpf_object__close(struct bpf_object *object); 208 209 struct bpf_object_load_attr { 210 struct bpf_object *obj; 211 int log_level; 212 const char *target_btf_path; 213 }; 214 215 /* Load/unload object into/from kernel */ 216 LIBBPF_API int bpf_object__load(struct bpf_object *obj); 217 LIBBPF_DEPRECATED_SINCE(0, 8, "use bpf_object__load() instead") 218 LIBBPF_API int bpf_object__load_xattr(struct bpf_object_load_attr *attr); 219 LIBBPF_DEPRECATED_SINCE(0, 6, "bpf_object__unload() is deprecated, use bpf_object__close() instead") 220 LIBBPF_API int bpf_object__unload(struct bpf_object *obj); 221 222 LIBBPF_API const char *bpf_object__name(const struct bpf_object *obj); 223 LIBBPF_API unsigned int bpf_object__kversion(const struct bpf_object *obj); 224 LIBBPF_API int bpf_object__set_kversion(struct bpf_object *obj, __u32 kern_version); 225 226 struct btf; 227 LIBBPF_API struct btf *bpf_object__btf(const struct bpf_object *obj); 228 LIBBPF_API int bpf_object__btf_fd(const struct bpf_object *obj); 229 230 LIBBPF_DEPRECATED_SINCE(0, 7, "use bpf_object__find_program_by_name() instead") 231 LIBBPF_API struct bpf_program * 232 bpf_object__find_program_by_title(const struct bpf_object *obj, 233 const char *title); 234 LIBBPF_API struct bpf_program * 235 bpf_object__find_program_by_name(const struct bpf_object *obj, 236 const char *name); 237 238 LIBBPF_API LIBBPF_DEPRECATED_SINCE(0, 7, "track bpf_objects in application code instead") 239 struct bpf_object *bpf_object__next(struct bpf_object *prev); 240 #define bpf_object__for_each_safe(pos, tmp) \ 241 for ((pos) = bpf_object__next(NULL), \ 242 (tmp) = bpf_object__next(pos); \ 243 (pos) != NULL; \ 244 (pos) = (tmp), (tmp) = bpf_object__next(tmp)) 245 246 typedef void (*bpf_object_clear_priv_t)(struct bpf_object *, void *); 247 LIBBPF_API int bpf_object__set_priv(struct bpf_object *obj, void *priv, 248 bpf_object_clear_priv_t clear_priv); 249 LIBBPF_API void *bpf_object__priv(const struct bpf_object *prog); 250 251 LIBBPF_API int 252 libbpf_prog_type_by_name(const char *name, enum bpf_prog_type *prog_type, 253 enum bpf_attach_type *expected_attach_type); 254 LIBBPF_API int libbpf_attach_type_by_name(const char *name, 255 enum bpf_attach_type *attach_type); 256 LIBBPF_API int libbpf_find_vmlinux_btf_id(const char *name, 257 enum bpf_attach_type attach_type); 258 259 /* Accessors of bpf_program */ 260 struct bpf_program; 261 LIBBPF_API LIBBPF_DEPRECATED_SINCE(0, 7, "use bpf_object__next_program() instead") 262 struct bpf_program *bpf_program__next(struct bpf_program *prog, 263 const struct bpf_object *obj); 264 LIBBPF_API struct bpf_program * 265 bpf_object__next_program(const struct bpf_object *obj, struct bpf_program *prog); 266 267 #define bpf_object__for_each_program(pos, obj) \ 268 for ((pos) = bpf_object__next_program((obj), NULL); \ 269 (pos) != NULL; \ 270 (pos) = bpf_object__next_program((obj), (pos))) 271 272 LIBBPF_API LIBBPF_DEPRECATED_SINCE(0, 7, "use bpf_object__prev_program() instead") 273 struct bpf_program *bpf_program__prev(struct bpf_program *prog, 274 const struct bpf_object *obj); 275 LIBBPF_API struct bpf_program * 276 bpf_object__prev_program(const struct bpf_object *obj, struct bpf_program *prog); 277 278 typedef void (*bpf_program_clear_priv_t)(struct bpf_program *, void *); 279 280 LIBBPF_API int bpf_program__set_priv(struct bpf_program *prog, void *priv, 281 bpf_program_clear_priv_t clear_priv); 282 283 LIBBPF_API void *bpf_program__priv(const struct bpf_program *prog); 284 LIBBPF_API void bpf_program__set_ifindex(struct bpf_program *prog, 285 __u32 ifindex); 286 287 LIBBPF_API const char *bpf_program__name(const struct bpf_program *prog); 288 LIBBPF_API const char *bpf_program__section_name(const struct bpf_program *prog); 289 LIBBPF_API LIBBPF_DEPRECATED("BPF program title is confusing term; please use bpf_program__section_name() instead") 290 const char *bpf_program__title(const struct bpf_program *prog, bool needs_copy); 291 LIBBPF_API bool bpf_program__autoload(const struct bpf_program *prog); 292 LIBBPF_API int bpf_program__set_autoload(struct bpf_program *prog, bool autoload); 293 294 /* returns program size in bytes */ 295 LIBBPF_DEPRECATED_SINCE(0, 7, "use bpf_program__insn_cnt() instead") 296 LIBBPF_API size_t bpf_program__size(const struct bpf_program *prog); 297 298 struct bpf_insn; 299 300 /** 301 * @brief **bpf_program__insns()** gives read-only access to BPF program's 302 * underlying BPF instructions. 303 * @param prog BPF program for which to return instructions 304 * @return a pointer to an array of BPF instructions that belong to the 305 * specified BPF program 306 * 307 * Returned pointer is always valid and not NULL. Number of `struct bpf_insn` 308 * pointed to can be fetched using **bpf_program__insn_cnt()** API. 309 * 310 * Keep in mind, libbpf can modify and append/delete BPF program's 311 * instructions as it processes BPF object file and prepares everything for 312 * uploading into the kernel. So depending on the point in BPF object 313 * lifetime, **bpf_program__insns()** can return different sets of 314 * instructions. As an example, during BPF object load phase BPF program 315 * instructions will be CO-RE-relocated, BPF subprograms instructions will be 316 * appended, ldimm64 instructions will have FDs embedded, etc. So instructions 317 * returned before **bpf_object__load()** and after it might be quite 318 * different. 319 */ 320 LIBBPF_API const struct bpf_insn *bpf_program__insns(const struct bpf_program *prog); 321 /** 322 * @brief **bpf_program__insn_cnt()** returns number of `struct bpf_insn`'s 323 * that form specified BPF program. 324 * @param prog BPF program for which to return number of BPF instructions 325 * 326 * See **bpf_program__insns()** documentation for notes on how libbpf can 327 * change instructions and their count during different phases of 328 * **bpf_object** lifetime. 329 */ 330 LIBBPF_API size_t bpf_program__insn_cnt(const struct bpf_program *prog); 331 332 LIBBPF_DEPRECATED_SINCE(0, 6, "use bpf_object__load() instead") 333 LIBBPF_API int bpf_program__load(struct bpf_program *prog, const char *license, __u32 kern_version); 334 LIBBPF_API int bpf_program__fd(const struct bpf_program *prog); 335 LIBBPF_DEPRECATED_SINCE(0, 7, "multi-instance bpf_program support is deprecated") 336 LIBBPF_API int bpf_program__pin_instance(struct bpf_program *prog, 337 const char *path, 338 int instance); 339 LIBBPF_DEPRECATED_SINCE(0, 7, "multi-instance bpf_program support is deprecated") 340 LIBBPF_API int bpf_program__unpin_instance(struct bpf_program *prog, 341 const char *path, 342 int instance); 343 344 /** 345 * @brief **bpf_program__pin()** pins the BPF program to a file 346 * in the BPF FS specified by a path. This increments the programs 347 * reference count, allowing it to stay loaded after the process 348 * which loaded it has exited. 349 * 350 * @param prog BPF program to pin, must already be loaded 351 * @param path file path in a BPF file system 352 * @return 0, on success; negative error code, otherwise 353 */ 354 LIBBPF_API int bpf_program__pin(struct bpf_program *prog, const char *path); 355 356 /** 357 * @brief **bpf_program__unpin()** unpins the BPF program from a file 358 * in the BPFFS specified by a path. This decrements the programs 359 * reference count. 360 * 361 * The file pinning the BPF program can also be unlinked by a different 362 * process in which case this function will return an error. 363 * 364 * @param prog BPF program to unpin 365 * @param path file path to the pin in a BPF file system 366 * @return 0, on success; negative error code, otherwise 367 */ 368 LIBBPF_API int bpf_program__unpin(struct bpf_program *prog, const char *path); 369 LIBBPF_API void bpf_program__unload(struct bpf_program *prog); 370 371 struct bpf_link; 372 373 LIBBPF_API struct bpf_link *bpf_link__open(const char *path); 374 LIBBPF_API int bpf_link__fd(const struct bpf_link *link); 375 LIBBPF_API const char *bpf_link__pin_path(const struct bpf_link *link); 376 LIBBPF_API int bpf_link__pin(struct bpf_link *link, const char *path); 377 LIBBPF_API int bpf_link__unpin(struct bpf_link *link); 378 LIBBPF_API int bpf_link__update_program(struct bpf_link *link, 379 struct bpf_program *prog); 380 LIBBPF_API void bpf_link__disconnect(struct bpf_link *link); 381 LIBBPF_API int bpf_link__detach(struct bpf_link *link); 382 LIBBPF_API int bpf_link__destroy(struct bpf_link *link); 383 384 LIBBPF_API struct bpf_link * 385 bpf_program__attach(const struct bpf_program *prog); 386 387 struct bpf_perf_event_opts { 388 /* size of this struct, for forward/backward compatiblity */ 389 size_t sz; 390 /* custom user-provided value fetchable through bpf_get_attach_cookie() */ 391 __u64 bpf_cookie; 392 }; 393 #define bpf_perf_event_opts__last_field bpf_cookie 394 395 LIBBPF_API struct bpf_link * 396 bpf_program__attach_perf_event(const struct bpf_program *prog, int pfd); 397 398 LIBBPF_API struct bpf_link * 399 bpf_program__attach_perf_event_opts(const struct bpf_program *prog, int pfd, 400 const struct bpf_perf_event_opts *opts); 401 402 struct bpf_kprobe_opts { 403 /* size of this struct, for forward/backward compatiblity */ 404 size_t sz; 405 /* custom user-provided value fetchable through bpf_get_attach_cookie() */ 406 __u64 bpf_cookie; 407 /* function's offset to install kprobe to */ 408 size_t offset; 409 /* kprobe is return probe */ 410 bool retprobe; 411 size_t :0; 412 }; 413 #define bpf_kprobe_opts__last_field retprobe 414 415 LIBBPF_API struct bpf_link * 416 bpf_program__attach_kprobe(const struct bpf_program *prog, bool retprobe, 417 const char *func_name); 418 LIBBPF_API struct bpf_link * 419 bpf_program__attach_kprobe_opts(const struct bpf_program *prog, 420 const char *func_name, 421 const struct bpf_kprobe_opts *opts); 422 423 struct bpf_uprobe_opts { 424 /* size of this struct, for forward/backward compatiblity */ 425 size_t sz; 426 /* offset of kernel reference counted USDT semaphore, added in 427 * a6ca88b241d5 ("trace_uprobe: support reference counter in fd-based uprobe") 428 */ 429 size_t ref_ctr_offset; 430 /* custom user-provided value fetchable through bpf_get_attach_cookie() */ 431 __u64 bpf_cookie; 432 /* uprobe is return probe, invoked at function return time */ 433 bool retprobe; 434 size_t :0; 435 }; 436 #define bpf_uprobe_opts__last_field retprobe 437 438 /** 439 * @brief **bpf_program__attach_uprobe()** attaches a BPF program 440 * to the userspace function which is found by binary path and 441 * offset. You can optionally specify a particular proccess to attach 442 * to. You can also optionally attach the program to the function 443 * exit instead of entry. 444 * 445 * @param prog BPF program to attach 446 * @param retprobe Attach to function exit 447 * @param pid Process ID to attach the uprobe to, 0 for self (own process), 448 * -1 for all processes 449 * @param binary_path Path to binary that contains the function symbol 450 * @param func_offset Offset within the binary of the function symbol 451 * @return Reference to the newly created BPF link; or NULL is returned on error, 452 * error code is stored in errno 453 */ 454 LIBBPF_API struct bpf_link * 455 bpf_program__attach_uprobe(const struct bpf_program *prog, bool retprobe, 456 pid_t pid, const char *binary_path, 457 size_t func_offset); 458 459 /** 460 * @brief **bpf_program__attach_uprobe_opts()** is just like 461 * bpf_program__attach_uprobe() except with a options struct 462 * for various configurations. 463 * 464 * @param prog BPF program to attach 465 * @param pid Process ID to attach the uprobe to, 0 for self (own process), 466 * -1 for all processes 467 * @param binary_path Path to binary that contains the function symbol 468 * @param func_offset Offset within the binary of the function symbol 469 * @param opts Options for altering program attachment 470 * @return Reference to the newly created BPF link; or NULL is returned on error, 471 * error code is stored in errno 472 */ 473 LIBBPF_API struct bpf_link * 474 bpf_program__attach_uprobe_opts(const struct bpf_program *prog, pid_t pid, 475 const char *binary_path, size_t func_offset, 476 const struct bpf_uprobe_opts *opts); 477 478 struct bpf_tracepoint_opts { 479 /* size of this struct, for forward/backward compatiblity */ 480 size_t sz; 481 /* custom user-provided value fetchable through bpf_get_attach_cookie() */ 482 __u64 bpf_cookie; 483 }; 484 #define bpf_tracepoint_opts__last_field bpf_cookie 485 486 LIBBPF_API struct bpf_link * 487 bpf_program__attach_tracepoint(const struct bpf_program *prog, 488 const char *tp_category, 489 const char *tp_name); 490 LIBBPF_API struct bpf_link * 491 bpf_program__attach_tracepoint_opts(const struct bpf_program *prog, 492 const char *tp_category, 493 const char *tp_name, 494 const struct bpf_tracepoint_opts *opts); 495 496 LIBBPF_API struct bpf_link * 497 bpf_program__attach_raw_tracepoint(const struct bpf_program *prog, 498 const char *tp_name); 499 LIBBPF_API struct bpf_link * 500 bpf_program__attach_trace(const struct bpf_program *prog); 501 LIBBPF_API struct bpf_link * 502 bpf_program__attach_lsm(const struct bpf_program *prog); 503 LIBBPF_API struct bpf_link * 504 bpf_program__attach_cgroup(const struct bpf_program *prog, int cgroup_fd); 505 LIBBPF_API struct bpf_link * 506 bpf_program__attach_netns(const struct bpf_program *prog, int netns_fd); 507 LIBBPF_API struct bpf_link * 508 bpf_program__attach_xdp(const struct bpf_program *prog, int ifindex); 509 LIBBPF_API struct bpf_link * 510 bpf_program__attach_freplace(const struct bpf_program *prog, 511 int target_fd, const char *attach_func_name); 512 513 struct bpf_map; 514 515 LIBBPF_API struct bpf_link *bpf_map__attach_struct_ops(const struct bpf_map *map); 516 517 struct bpf_iter_attach_opts { 518 size_t sz; /* size of this struct for forward/backward compatibility */ 519 union bpf_iter_link_info *link_info; 520 __u32 link_info_len; 521 }; 522 #define bpf_iter_attach_opts__last_field link_info_len 523 524 LIBBPF_API struct bpf_link * 525 bpf_program__attach_iter(const struct bpf_program *prog, 526 const struct bpf_iter_attach_opts *opts); 527 528 /* 529 * Libbpf allows callers to adjust BPF programs before being loaded 530 * into kernel. One program in an object file can be transformed into 531 * multiple variants to be attached to different hooks. 532 * 533 * bpf_program_prep_t, bpf_program__set_prep and bpf_program__nth_fd 534 * form an API for this purpose. 535 * 536 * - bpf_program_prep_t: 537 * Defines a 'preprocessor', which is a caller defined function 538 * passed to libbpf through bpf_program__set_prep(), and will be 539 * called before program is loaded. The processor should adjust 540 * the program one time for each instance according to the instance id 541 * passed to it. 542 * 543 * - bpf_program__set_prep: 544 * Attaches a preprocessor to a BPF program. The number of instances 545 * that should be created is also passed through this function. 546 * 547 * - bpf_program__nth_fd: 548 * After the program is loaded, get resulting FD of a given instance 549 * of the BPF program. 550 * 551 * If bpf_program__set_prep() is not used, the program would be loaded 552 * without adjustment during bpf_object__load(). The program has only 553 * one instance. In this case bpf_program__fd(prog) is equal to 554 * bpf_program__nth_fd(prog, 0). 555 */ 556 struct bpf_prog_prep_result { 557 /* 558 * If not NULL, load new instruction array. 559 * If set to NULL, don't load this instance. 560 */ 561 struct bpf_insn *new_insn_ptr; 562 int new_insn_cnt; 563 564 /* If not NULL, result FD is written to it. */ 565 int *pfd; 566 }; 567 568 /* 569 * Parameters of bpf_program_prep_t: 570 * - prog: The bpf_program being loaded. 571 * - n: Index of instance being generated. 572 * - insns: BPF instructions array. 573 * - insns_cnt:Number of instructions in insns. 574 * - res: Output parameter, result of transformation. 575 * 576 * Return value: 577 * - Zero: pre-processing success. 578 * - Non-zero: pre-processing error, stop loading. 579 */ 580 typedef int (*bpf_program_prep_t)(struct bpf_program *prog, int n, 581 struct bpf_insn *insns, int insns_cnt, 582 struct bpf_prog_prep_result *res); 583 584 LIBBPF_DEPRECATED_SINCE(0, 7, "use bpf_program__insns() for getting bpf_program instructions") 585 LIBBPF_API int bpf_program__set_prep(struct bpf_program *prog, int nr_instance, 586 bpf_program_prep_t prep); 587 588 LIBBPF_DEPRECATED_SINCE(0, 7, "multi-instance bpf_program support is deprecated") 589 LIBBPF_API int bpf_program__nth_fd(const struct bpf_program *prog, int n); 590 591 /* 592 * Adjust type of BPF program. Default is kprobe. 593 */ 594 LIBBPF_API int bpf_program__set_socket_filter(struct bpf_program *prog); 595 LIBBPF_API int bpf_program__set_tracepoint(struct bpf_program *prog); 596 LIBBPF_API int bpf_program__set_raw_tracepoint(struct bpf_program *prog); 597 LIBBPF_API int bpf_program__set_kprobe(struct bpf_program *prog); 598 LIBBPF_API int bpf_program__set_lsm(struct bpf_program *prog); 599 LIBBPF_API int bpf_program__set_sched_cls(struct bpf_program *prog); 600 LIBBPF_API int bpf_program__set_sched_act(struct bpf_program *prog); 601 LIBBPF_API int bpf_program__set_xdp(struct bpf_program *prog); 602 LIBBPF_API int bpf_program__set_perf_event(struct bpf_program *prog); 603 LIBBPF_API int bpf_program__set_tracing(struct bpf_program *prog); 604 LIBBPF_API int bpf_program__set_struct_ops(struct bpf_program *prog); 605 LIBBPF_API int bpf_program__set_extension(struct bpf_program *prog); 606 LIBBPF_API int bpf_program__set_sk_lookup(struct bpf_program *prog); 607 608 LIBBPF_API enum bpf_prog_type bpf_program__get_type(const struct bpf_program *prog); 609 LIBBPF_API void bpf_program__set_type(struct bpf_program *prog, 610 enum bpf_prog_type type); 611 612 LIBBPF_API enum bpf_attach_type 613 bpf_program__get_expected_attach_type(const struct bpf_program *prog); 614 LIBBPF_API void 615 bpf_program__set_expected_attach_type(struct bpf_program *prog, 616 enum bpf_attach_type type); 617 618 LIBBPF_API __u32 bpf_program__flags(const struct bpf_program *prog); 619 LIBBPF_API int bpf_program__set_flags(struct bpf_program *prog, __u32 flags); 620 621 /* Per-program log level and log buffer getters/setters. 622 * See bpf_object_open_opts comments regarding log_level and log_buf 623 * interactions. 624 */ 625 LIBBPF_API __u32 bpf_program__log_level(const struct bpf_program *prog); 626 LIBBPF_API int bpf_program__set_log_level(struct bpf_program *prog, __u32 log_level); 627 LIBBPF_API const char *bpf_program__log_buf(const struct bpf_program *prog, size_t *log_size); 628 LIBBPF_API int bpf_program__set_log_buf(struct bpf_program *prog, char *log_buf, size_t log_size); 629 630 LIBBPF_API int 631 bpf_program__set_attach_target(struct bpf_program *prog, int attach_prog_fd, 632 const char *attach_func_name); 633 634 LIBBPF_API bool bpf_program__is_socket_filter(const struct bpf_program *prog); 635 LIBBPF_API bool bpf_program__is_tracepoint(const struct bpf_program *prog); 636 LIBBPF_API bool bpf_program__is_raw_tracepoint(const struct bpf_program *prog); 637 LIBBPF_API bool bpf_program__is_kprobe(const struct bpf_program *prog); 638 LIBBPF_API bool bpf_program__is_lsm(const struct bpf_program *prog); 639 LIBBPF_API bool bpf_program__is_sched_cls(const struct bpf_program *prog); 640 LIBBPF_API bool bpf_program__is_sched_act(const struct bpf_program *prog); 641 LIBBPF_API bool bpf_program__is_xdp(const struct bpf_program *prog); 642 LIBBPF_API bool bpf_program__is_perf_event(const struct bpf_program *prog); 643 LIBBPF_API bool bpf_program__is_tracing(const struct bpf_program *prog); 644 LIBBPF_API bool bpf_program__is_struct_ops(const struct bpf_program *prog); 645 LIBBPF_API bool bpf_program__is_extension(const struct bpf_program *prog); 646 LIBBPF_API bool bpf_program__is_sk_lookup(const struct bpf_program *prog); 647 648 /* 649 * No need for __attribute__((packed)), all members of 'bpf_map_def' 650 * are all aligned. In addition, using __attribute__((packed)) 651 * would trigger a -Wpacked warning message, and lead to an error 652 * if -Werror is set. 653 */ 654 struct bpf_map_def { 655 unsigned int type; 656 unsigned int key_size; 657 unsigned int value_size; 658 unsigned int max_entries; 659 unsigned int map_flags; 660 }; 661 662 /** 663 * @brief **bpf_object__find_map_by_name()** returns BPF map of 664 * the given name, if it exists within the passed BPF object 665 * @param obj BPF object 666 * @param name name of the BPF map 667 * @return BPF map instance, if such map exists within the BPF object; 668 * or NULL otherwise. 669 */ 670 LIBBPF_API struct bpf_map * 671 bpf_object__find_map_by_name(const struct bpf_object *obj, const char *name); 672 673 LIBBPF_API int 674 bpf_object__find_map_fd_by_name(const struct bpf_object *obj, const char *name); 675 676 /* 677 * Get bpf_map through the offset of corresponding struct bpf_map_def 678 * in the BPF object file. 679 */ 680 LIBBPF_API LIBBPF_DEPRECATED_SINCE(0, 8, "use bpf_object__find_map_by_name() instead") 681 struct bpf_map * 682 bpf_object__find_map_by_offset(struct bpf_object *obj, size_t offset); 683 684 LIBBPF_API LIBBPF_DEPRECATED_SINCE(0, 7, "use bpf_object__next_map() instead") 685 struct bpf_map *bpf_map__next(const struct bpf_map *map, const struct bpf_object *obj); 686 LIBBPF_API struct bpf_map * 687 bpf_object__next_map(const struct bpf_object *obj, const struct bpf_map *map); 688 689 #define bpf_object__for_each_map(pos, obj) \ 690 for ((pos) = bpf_object__next_map((obj), NULL); \ 691 (pos) != NULL; \ 692 (pos) = bpf_object__next_map((obj), (pos))) 693 #define bpf_map__for_each bpf_object__for_each_map 694 695 LIBBPF_API LIBBPF_DEPRECATED_SINCE(0, 7, "use bpf_object__prev_map() instead") 696 struct bpf_map *bpf_map__prev(const struct bpf_map *map, const struct bpf_object *obj); 697 LIBBPF_API struct bpf_map * 698 bpf_object__prev_map(const struct bpf_object *obj, const struct bpf_map *map); 699 700 /** 701 * @brief **bpf_map__fd()** gets the file descriptor of the passed 702 * BPF map 703 * @param map the BPF map instance 704 * @return the file descriptor; or -EINVAL in case of an error 705 */ 706 LIBBPF_API int bpf_map__fd(const struct bpf_map *map); 707 LIBBPF_API int bpf_map__reuse_fd(struct bpf_map *map, int fd); 708 /* get map definition */ 709 LIBBPF_API const struct bpf_map_def *bpf_map__def(const struct bpf_map *map); 710 /* get map name */ 711 LIBBPF_API const char *bpf_map__name(const struct bpf_map *map); 712 /* get/set map type */ 713 LIBBPF_API enum bpf_map_type bpf_map__type(const struct bpf_map *map); 714 LIBBPF_API int bpf_map__set_type(struct bpf_map *map, enum bpf_map_type type); 715 /* get/set map size (max_entries) */ 716 LIBBPF_API __u32 bpf_map__max_entries(const struct bpf_map *map); 717 LIBBPF_API int bpf_map__set_max_entries(struct bpf_map *map, __u32 max_entries); 718 LIBBPF_API int bpf_map__resize(struct bpf_map *map, __u32 max_entries); 719 /* get/set map flags */ 720 LIBBPF_API __u32 bpf_map__map_flags(const struct bpf_map *map); 721 LIBBPF_API int bpf_map__set_map_flags(struct bpf_map *map, __u32 flags); 722 /* get/set map NUMA node */ 723 LIBBPF_API __u32 bpf_map__numa_node(const struct bpf_map *map); 724 LIBBPF_API int bpf_map__set_numa_node(struct bpf_map *map, __u32 numa_node); 725 /* get/set map key size */ 726 LIBBPF_API __u32 bpf_map__key_size(const struct bpf_map *map); 727 LIBBPF_API int bpf_map__set_key_size(struct bpf_map *map, __u32 size); 728 /* get/set map value size */ 729 LIBBPF_API __u32 bpf_map__value_size(const struct bpf_map *map); 730 LIBBPF_API int bpf_map__set_value_size(struct bpf_map *map, __u32 size); 731 /* get map key/value BTF type IDs */ 732 LIBBPF_API __u32 bpf_map__btf_key_type_id(const struct bpf_map *map); 733 LIBBPF_API __u32 bpf_map__btf_value_type_id(const struct bpf_map *map); 734 /* get/set map if_index */ 735 LIBBPF_API __u32 bpf_map__ifindex(const struct bpf_map *map); 736 LIBBPF_API int bpf_map__set_ifindex(struct bpf_map *map, __u32 ifindex); 737 /* get/set map map_extra flags */ 738 LIBBPF_API __u64 bpf_map__map_extra(const struct bpf_map *map); 739 LIBBPF_API int bpf_map__set_map_extra(struct bpf_map *map, __u64 map_extra); 740 741 typedef void (*bpf_map_clear_priv_t)(struct bpf_map *, void *); 742 LIBBPF_API int bpf_map__set_priv(struct bpf_map *map, void *priv, 743 bpf_map_clear_priv_t clear_priv); 744 LIBBPF_API void *bpf_map__priv(const struct bpf_map *map); 745 LIBBPF_API int bpf_map__set_initial_value(struct bpf_map *map, 746 const void *data, size_t size); 747 LIBBPF_API const void *bpf_map__initial_value(struct bpf_map *map, size_t *psize); 748 LIBBPF_DEPRECATED_SINCE(0, 8, "use bpf_map__type() instead") 749 LIBBPF_API bool bpf_map__is_offload_neutral(const struct bpf_map *map); 750 751 /** 752 * @brief **bpf_map__is_internal()** tells the caller whether or not the 753 * passed map is a special map created by libbpf automatically for things like 754 * global variables, __ksym externs, Kconfig values, etc 755 * @param map the bpf_map 756 * @return true, if the map is an internal map; false, otherwise 757 */ 758 LIBBPF_API bool bpf_map__is_internal(const struct bpf_map *map); 759 LIBBPF_API int bpf_map__set_pin_path(struct bpf_map *map, const char *path); 760 LIBBPF_API const char *bpf_map__get_pin_path(const struct bpf_map *map); 761 LIBBPF_API const char *bpf_map__pin_path(const struct bpf_map *map); 762 LIBBPF_API bool bpf_map__is_pinned(const struct bpf_map *map); 763 LIBBPF_API int bpf_map__pin(struct bpf_map *map, const char *path); 764 LIBBPF_API int bpf_map__unpin(struct bpf_map *map, const char *path); 765 766 LIBBPF_API int bpf_map__set_inner_map_fd(struct bpf_map *map, int fd); 767 LIBBPF_API struct bpf_map *bpf_map__inner_map(struct bpf_map *map); 768 769 /** 770 * @brief **libbpf_get_error()** extracts the error code from the passed 771 * pointer 772 * @param ptr pointer returned from libbpf API function 773 * @return error code; or 0 if no error occured 774 * 775 * Many libbpf API functions which return pointers have logic to encode error 776 * codes as pointers, and do not return NULL. Meaning **libbpf_get_error()** 777 * should be used on the return value from these functions immediately after 778 * calling the API function, with no intervening calls that could clobber the 779 * `errno` variable. Consult the individual functions documentation to verify 780 * if this logic applies should be used. 781 * 782 * For these API functions, if `libbpf_set_strict_mode(LIBBPF_STRICT_CLEAN_PTRS)` 783 * is enabled, NULL is returned on error instead. 784 * 785 * If ptr is NULL, then errno should be already set by the failing 786 * API, because libbpf never returns NULL on success and it now always 787 * sets errno on error. 788 * 789 * Example usage: 790 * 791 * struct perf_buffer *pb; 792 * 793 * pb = perf_buffer__new(bpf_map__fd(obj->maps.events), PERF_BUFFER_PAGES, &opts); 794 * err = libbpf_get_error(pb); 795 * if (err) { 796 * pb = NULL; 797 * fprintf(stderr, "failed to open perf buffer: %d\n", err); 798 * goto cleanup; 799 * } 800 */ 801 LIBBPF_API long libbpf_get_error(const void *ptr); 802 803 struct bpf_prog_load_attr { 804 const char *file; 805 enum bpf_prog_type prog_type; 806 enum bpf_attach_type expected_attach_type; 807 int ifindex; 808 int log_level; 809 int prog_flags; 810 }; 811 812 LIBBPF_DEPRECATED_SINCE(0, 8, "use bpf_object__open() and bpf_object__load() instead") 813 LIBBPF_API int bpf_prog_load_xattr(const struct bpf_prog_load_attr *attr, 814 struct bpf_object **pobj, int *prog_fd); 815 LIBBPF_DEPRECATED_SINCE(0, 7, "use bpf_object__open() and bpf_object__load() instead") 816 LIBBPF_API int bpf_prog_load_deprecated(const char *file, enum bpf_prog_type type, 817 struct bpf_object **pobj, int *prog_fd); 818 819 /* XDP related API */ 820 struct xdp_link_info { 821 __u32 prog_id; 822 __u32 drv_prog_id; 823 __u32 hw_prog_id; 824 __u32 skb_prog_id; 825 __u8 attach_mode; 826 }; 827 828 struct bpf_xdp_set_link_opts { 829 size_t sz; 830 int old_fd; 831 size_t :0; 832 }; 833 #define bpf_xdp_set_link_opts__last_field old_fd 834 835 LIBBPF_API int bpf_set_link_xdp_fd(int ifindex, int fd, __u32 flags); 836 LIBBPF_API int bpf_set_link_xdp_fd_opts(int ifindex, int fd, __u32 flags, 837 const struct bpf_xdp_set_link_opts *opts); 838 LIBBPF_API int bpf_get_link_xdp_id(int ifindex, __u32 *prog_id, __u32 flags); 839 LIBBPF_API int bpf_get_link_xdp_info(int ifindex, struct xdp_link_info *info, 840 size_t info_size, __u32 flags); 841 842 /* TC related API */ 843 enum bpf_tc_attach_point { 844 BPF_TC_INGRESS = 1 << 0, 845 BPF_TC_EGRESS = 1 << 1, 846 BPF_TC_CUSTOM = 1 << 2, 847 }; 848 849 #define BPF_TC_PARENT(a, b) \ 850 ((((a) << 16) & 0xFFFF0000U) | ((b) & 0x0000FFFFU)) 851 852 enum bpf_tc_flags { 853 BPF_TC_F_REPLACE = 1 << 0, 854 }; 855 856 struct bpf_tc_hook { 857 size_t sz; 858 int ifindex; 859 enum bpf_tc_attach_point attach_point; 860 __u32 parent; 861 size_t :0; 862 }; 863 #define bpf_tc_hook__last_field parent 864 865 struct bpf_tc_opts { 866 size_t sz; 867 int prog_fd; 868 __u32 flags; 869 __u32 prog_id; 870 __u32 handle; 871 __u32 priority; 872 size_t :0; 873 }; 874 #define bpf_tc_opts__last_field priority 875 876 LIBBPF_API int bpf_tc_hook_create(struct bpf_tc_hook *hook); 877 LIBBPF_API int bpf_tc_hook_destroy(struct bpf_tc_hook *hook); 878 LIBBPF_API int bpf_tc_attach(const struct bpf_tc_hook *hook, 879 struct bpf_tc_opts *opts); 880 LIBBPF_API int bpf_tc_detach(const struct bpf_tc_hook *hook, 881 const struct bpf_tc_opts *opts); 882 LIBBPF_API int bpf_tc_query(const struct bpf_tc_hook *hook, 883 struct bpf_tc_opts *opts); 884 885 /* Ring buffer APIs */ 886 struct ring_buffer; 887 888 typedef int (*ring_buffer_sample_fn)(void *ctx, void *data, size_t size); 889 890 struct ring_buffer_opts { 891 size_t sz; /* size of this struct, for forward/backward compatiblity */ 892 }; 893 894 #define ring_buffer_opts__last_field sz 895 896 LIBBPF_API struct ring_buffer * 897 ring_buffer__new(int map_fd, ring_buffer_sample_fn sample_cb, void *ctx, 898 const struct ring_buffer_opts *opts); 899 LIBBPF_API void ring_buffer__free(struct ring_buffer *rb); 900 LIBBPF_API int ring_buffer__add(struct ring_buffer *rb, int map_fd, 901 ring_buffer_sample_fn sample_cb, void *ctx); 902 LIBBPF_API int ring_buffer__poll(struct ring_buffer *rb, int timeout_ms); 903 LIBBPF_API int ring_buffer__consume(struct ring_buffer *rb); 904 LIBBPF_API int ring_buffer__epoll_fd(const struct ring_buffer *rb); 905 906 /* Perf buffer APIs */ 907 struct perf_buffer; 908 909 typedef void (*perf_buffer_sample_fn)(void *ctx, int cpu, 910 void *data, __u32 size); 911 typedef void (*perf_buffer_lost_fn)(void *ctx, int cpu, __u64 cnt); 912 913 /* common use perf buffer options */ 914 struct perf_buffer_opts { 915 union { 916 size_t sz; 917 struct { /* DEPRECATED: will be removed in v1.0 */ 918 /* if specified, sample_cb is called for each sample */ 919 perf_buffer_sample_fn sample_cb; 920 /* if specified, lost_cb is called for each batch of lost samples */ 921 perf_buffer_lost_fn lost_cb; 922 /* ctx is provided to sample_cb and lost_cb */ 923 void *ctx; 924 }; 925 }; 926 }; 927 #define perf_buffer_opts__last_field sz 928 929 /** 930 * @brief **perf_buffer__new()** creates BPF perfbuf manager for a specified 931 * BPF_PERF_EVENT_ARRAY map 932 * @param map_fd FD of BPF_PERF_EVENT_ARRAY BPF map that will be used by BPF 933 * code to send data over to user-space 934 * @param page_cnt number of memory pages allocated for each per-CPU buffer 935 * @param sample_cb function called on each received data record 936 * @param lost_cb function called when record loss has occurred 937 * @param ctx user-provided extra context passed into *sample_cb* and *lost_cb* 938 * @return a new instance of struct perf_buffer on success, NULL on error with 939 * *errno* containing an error code 940 */ 941 LIBBPF_API struct perf_buffer * 942 perf_buffer__new(int map_fd, size_t page_cnt, 943 perf_buffer_sample_fn sample_cb, perf_buffer_lost_fn lost_cb, void *ctx, 944 const struct perf_buffer_opts *opts); 945 946 LIBBPF_API struct perf_buffer * 947 perf_buffer__new_v0_6_0(int map_fd, size_t page_cnt, 948 perf_buffer_sample_fn sample_cb, perf_buffer_lost_fn lost_cb, void *ctx, 949 const struct perf_buffer_opts *opts); 950 951 LIBBPF_API LIBBPF_DEPRECATED_SINCE(0, 7, "use new variant of perf_buffer__new() instead") 952 struct perf_buffer *perf_buffer__new_deprecated(int map_fd, size_t page_cnt, 953 const struct perf_buffer_opts *opts); 954 955 #define perf_buffer__new(...) ___libbpf_overload(___perf_buffer_new, __VA_ARGS__) 956 #define ___perf_buffer_new6(map_fd, page_cnt, sample_cb, lost_cb, ctx, opts) \ 957 perf_buffer__new(map_fd, page_cnt, sample_cb, lost_cb, ctx, opts) 958 #define ___perf_buffer_new3(map_fd, page_cnt, opts) \ 959 perf_buffer__new_deprecated(map_fd, page_cnt, opts) 960 961 enum bpf_perf_event_ret { 962 LIBBPF_PERF_EVENT_DONE = 0, 963 LIBBPF_PERF_EVENT_ERROR = -1, 964 LIBBPF_PERF_EVENT_CONT = -2, 965 }; 966 967 struct perf_event_header; 968 969 typedef enum bpf_perf_event_ret 970 (*perf_buffer_event_fn)(void *ctx, int cpu, struct perf_event_header *event); 971 972 /* raw perf buffer options, giving most power and control */ 973 struct perf_buffer_raw_opts { 974 union { 975 struct { 976 size_t sz; 977 long :0; 978 long :0; 979 }; 980 struct { /* DEPRECATED: will be removed in v1.0 */ 981 /* perf event attrs passed directly into perf_event_open() */ 982 struct perf_event_attr *attr; 983 /* raw event callback */ 984 perf_buffer_event_fn event_cb; 985 /* ctx is provided to event_cb */ 986 void *ctx; 987 }; 988 }; 989 /* if cpu_cnt == 0, open all on all possible CPUs (up to the number of 990 * max_entries of given PERF_EVENT_ARRAY map) 991 */ 992 int cpu_cnt; 993 /* if cpu_cnt > 0, cpus is an array of CPUs to open ring buffers on */ 994 int *cpus; 995 /* if cpu_cnt > 0, map_keys specify map keys to set per-CPU FDs for */ 996 int *map_keys; 997 }; 998 #define perf_buffer_raw_opts__last_field map_keys 999 1000 LIBBPF_API struct perf_buffer * 1001 perf_buffer__new_raw(int map_fd, size_t page_cnt, struct perf_event_attr *attr, 1002 perf_buffer_event_fn event_cb, void *ctx, 1003 const struct perf_buffer_raw_opts *opts); 1004 1005 LIBBPF_API struct perf_buffer * 1006 perf_buffer__new_raw_v0_6_0(int map_fd, size_t page_cnt, struct perf_event_attr *attr, 1007 perf_buffer_event_fn event_cb, void *ctx, 1008 const struct perf_buffer_raw_opts *opts); 1009 1010 LIBBPF_API LIBBPF_DEPRECATED_SINCE(0, 7, "use new variant of perf_buffer__new_raw() instead") 1011 struct perf_buffer *perf_buffer__new_raw_deprecated(int map_fd, size_t page_cnt, 1012 const struct perf_buffer_raw_opts *opts); 1013 1014 #define perf_buffer__new_raw(...) ___libbpf_overload(___perf_buffer_new_raw, __VA_ARGS__) 1015 #define ___perf_buffer_new_raw6(map_fd, page_cnt, attr, event_cb, ctx, opts) \ 1016 perf_buffer__new_raw(map_fd, page_cnt, attr, event_cb, ctx, opts) 1017 #define ___perf_buffer_new_raw3(map_fd, page_cnt, opts) \ 1018 perf_buffer__new_raw_deprecated(map_fd, page_cnt, opts) 1019 1020 LIBBPF_API void perf_buffer__free(struct perf_buffer *pb); 1021 LIBBPF_API int perf_buffer__epoll_fd(const struct perf_buffer *pb); 1022 LIBBPF_API int perf_buffer__poll(struct perf_buffer *pb, int timeout_ms); 1023 LIBBPF_API int perf_buffer__consume(struct perf_buffer *pb); 1024 LIBBPF_API int perf_buffer__consume_buffer(struct perf_buffer *pb, size_t buf_idx); 1025 LIBBPF_API size_t perf_buffer__buffer_cnt(const struct perf_buffer *pb); 1026 LIBBPF_API int perf_buffer__buffer_fd(const struct perf_buffer *pb, size_t buf_idx); 1027 1028 typedef enum bpf_perf_event_ret 1029 (*bpf_perf_event_print_t)(struct perf_event_header *hdr, 1030 void *private_data); 1031 LIBBPF_DEPRECATED_SINCE(0, 8, "use perf_buffer__poll() or perf_buffer__consume() instead") 1032 LIBBPF_API enum bpf_perf_event_ret 1033 bpf_perf_event_read_simple(void *mmap_mem, size_t mmap_size, size_t page_size, 1034 void **copy_mem, size_t *copy_size, 1035 bpf_perf_event_print_t fn, void *private_data); 1036 1037 struct bpf_prog_linfo; 1038 struct bpf_prog_info; 1039 1040 LIBBPF_API void bpf_prog_linfo__free(struct bpf_prog_linfo *prog_linfo); 1041 LIBBPF_API struct bpf_prog_linfo * 1042 bpf_prog_linfo__new(const struct bpf_prog_info *info); 1043 LIBBPF_API const struct bpf_line_info * 1044 bpf_prog_linfo__lfind_addr_func(const struct bpf_prog_linfo *prog_linfo, 1045 __u64 addr, __u32 func_idx, __u32 nr_skip); 1046 LIBBPF_API const struct bpf_line_info * 1047 bpf_prog_linfo__lfind(const struct bpf_prog_linfo *prog_linfo, 1048 __u32 insn_off, __u32 nr_skip); 1049 1050 /* 1051 * Probe for supported system features 1052 * 1053 * Note that running many of these probes in a short amount of time can cause 1054 * the kernel to reach the maximal size of lockable memory allowed for the 1055 * user, causing subsequent probes to fail. In this case, the caller may want 1056 * to adjust that limit with setrlimit(). 1057 */ 1058 LIBBPF_DEPRECATED_SINCE(0, 8, "use libbpf_probe_bpf_prog_type() instead") 1059 LIBBPF_API bool bpf_probe_prog_type(enum bpf_prog_type prog_type, __u32 ifindex); 1060 LIBBPF_DEPRECATED_SINCE(0, 8, "use libbpf_probe_bpf_map_type() instead") 1061 LIBBPF_API bool bpf_probe_map_type(enum bpf_map_type map_type, __u32 ifindex); 1062 LIBBPF_DEPRECATED_SINCE(0, 8, "use libbpf_probe_bpf_helper() instead") 1063 LIBBPF_API bool bpf_probe_helper(enum bpf_func_id id, enum bpf_prog_type prog_type, __u32 ifindex); 1064 LIBBPF_DEPRECATED_SINCE(0, 8, "implement your own or use bpftool for feature detection") 1065 LIBBPF_API bool bpf_probe_large_insn_limit(__u32 ifindex); 1066 1067 /** 1068 * @brief **libbpf_probe_bpf_prog_type()** detects if host kernel supports 1069 * BPF programs of a given type. 1070 * @param prog_type BPF program type to detect kernel support for 1071 * @param opts reserved for future extensibility, should be NULL 1072 * @return 1, if given program type is supported; 0, if given program type is 1073 * not supported; negative error code if feature detection failed or can't be 1074 * performed 1075 * 1076 * Make sure the process has required set of CAP_* permissions (or runs as 1077 * root) when performing feature checking. 1078 */ 1079 LIBBPF_API int libbpf_probe_bpf_prog_type(enum bpf_prog_type prog_type, const void *opts); 1080 /** 1081 * @brief **libbpf_probe_bpf_map_type()** detects if host kernel supports 1082 * BPF maps of a given type. 1083 * @param map_type BPF map type to detect kernel support for 1084 * @param opts reserved for future extensibility, should be NULL 1085 * @return 1, if given map type is supported; 0, if given map type is 1086 * not supported; negative error code if feature detection failed or can't be 1087 * performed 1088 * 1089 * Make sure the process has required set of CAP_* permissions (or runs as 1090 * root) when performing feature checking. 1091 */ 1092 LIBBPF_API int libbpf_probe_bpf_map_type(enum bpf_map_type map_type, const void *opts); 1093 /** 1094 * @brief **libbpf_probe_bpf_helper()** detects if host kernel supports the 1095 * use of a given BPF helper from specified BPF program type. 1096 * @param prog_type BPF program type used to check the support of BPF helper 1097 * @param helper_id BPF helper ID (enum bpf_func_id) to check support for 1098 * @param opts reserved for future extensibility, should be NULL 1099 * @return 1, if given combination of program type and helper is supported; 0, 1100 * if the combination is not supported; negative error code if feature 1101 * detection for provided input arguments failed or can't be performed 1102 * 1103 * Make sure the process has required set of CAP_* permissions (or runs as 1104 * root) when performing feature checking. 1105 */ 1106 LIBBPF_API int libbpf_probe_bpf_helper(enum bpf_prog_type prog_type, 1107 enum bpf_func_id helper_id, const void *opts); 1108 1109 /* 1110 * Get bpf_prog_info in continuous memory 1111 * 1112 * struct bpf_prog_info has multiple arrays. The user has option to choose 1113 * arrays to fetch from kernel. The following APIs provide an uniform way to 1114 * fetch these data. All arrays in bpf_prog_info are stored in a single 1115 * continuous memory region. This makes it easy to store the info in a 1116 * file. 1117 * 1118 * Before writing bpf_prog_info_linear to files, it is necessary to 1119 * translate pointers in bpf_prog_info to offsets. Helper functions 1120 * bpf_program__bpil_addr_to_offs() and bpf_program__bpil_offs_to_addr() 1121 * are introduced to switch between pointers and offsets. 1122 * 1123 * Examples: 1124 * # To fetch map_ids and prog_tags: 1125 * __u64 arrays = (1UL << BPF_PROG_INFO_MAP_IDS) | 1126 * (1UL << BPF_PROG_INFO_PROG_TAGS); 1127 * struct bpf_prog_info_linear *info_linear = 1128 * bpf_program__get_prog_info_linear(fd, arrays); 1129 * 1130 * # To save data in file 1131 * bpf_program__bpil_addr_to_offs(info_linear); 1132 * write(f, info_linear, sizeof(*info_linear) + info_linear->data_len); 1133 * 1134 * # To read data from file 1135 * read(f, info_linear, <proper_size>); 1136 * bpf_program__bpil_offs_to_addr(info_linear); 1137 */ 1138 enum bpf_prog_info_array { 1139 BPF_PROG_INFO_FIRST_ARRAY = 0, 1140 BPF_PROG_INFO_JITED_INSNS = 0, 1141 BPF_PROG_INFO_XLATED_INSNS, 1142 BPF_PROG_INFO_MAP_IDS, 1143 BPF_PROG_INFO_JITED_KSYMS, 1144 BPF_PROG_INFO_JITED_FUNC_LENS, 1145 BPF_PROG_INFO_FUNC_INFO, 1146 BPF_PROG_INFO_LINE_INFO, 1147 BPF_PROG_INFO_JITED_LINE_INFO, 1148 BPF_PROG_INFO_PROG_TAGS, 1149 BPF_PROG_INFO_LAST_ARRAY, 1150 }; 1151 1152 struct bpf_prog_info_linear { 1153 /* size of struct bpf_prog_info, when the tool is compiled */ 1154 __u32 info_len; 1155 /* total bytes allocated for data, round up to 8 bytes */ 1156 __u32 data_len; 1157 /* which arrays are included in data */ 1158 __u64 arrays; 1159 struct bpf_prog_info info; 1160 __u8 data[]; 1161 }; 1162 1163 LIBBPF_DEPRECATED_SINCE(0, 6, "use a custom linear prog_info wrapper") 1164 LIBBPF_API struct bpf_prog_info_linear * 1165 bpf_program__get_prog_info_linear(int fd, __u64 arrays); 1166 1167 LIBBPF_DEPRECATED_SINCE(0, 6, "use a custom linear prog_info wrapper") 1168 LIBBPF_API void 1169 bpf_program__bpil_addr_to_offs(struct bpf_prog_info_linear *info_linear); 1170 1171 LIBBPF_DEPRECATED_SINCE(0, 6, "use a custom linear prog_info wrapper") 1172 LIBBPF_API void 1173 bpf_program__bpil_offs_to_addr(struct bpf_prog_info_linear *info_linear); 1174 1175 /** 1176 * @brief **libbpf_num_possible_cpus()** is a helper function to get the 1177 * number of possible CPUs that the host kernel supports and expects. 1178 * @return number of possible CPUs; or error code on failure 1179 * 1180 * Example usage: 1181 * 1182 * int ncpus = libbpf_num_possible_cpus(); 1183 * if (ncpus < 0) { 1184 * // error handling 1185 * } 1186 * long values[ncpus]; 1187 * bpf_map_lookup_elem(per_cpu_map_fd, key, values); 1188 */ 1189 LIBBPF_API int libbpf_num_possible_cpus(void); 1190 1191 struct bpf_map_skeleton { 1192 const char *name; 1193 struct bpf_map **map; 1194 void **mmaped; 1195 }; 1196 1197 struct bpf_prog_skeleton { 1198 const char *name; 1199 struct bpf_program **prog; 1200 struct bpf_link **link; 1201 }; 1202 1203 struct bpf_object_skeleton { 1204 size_t sz; /* size of this struct, for forward/backward compatibility */ 1205 1206 const char *name; 1207 const void *data; 1208 size_t data_sz; 1209 1210 struct bpf_object **obj; 1211 1212 int map_cnt; 1213 int map_skel_sz; /* sizeof(struct bpf_map_skeleton) */ 1214 struct bpf_map_skeleton *maps; 1215 1216 int prog_cnt; 1217 int prog_skel_sz; /* sizeof(struct bpf_prog_skeleton) */ 1218 struct bpf_prog_skeleton *progs; 1219 }; 1220 1221 LIBBPF_API int 1222 bpf_object__open_skeleton(struct bpf_object_skeleton *s, 1223 const struct bpf_object_open_opts *opts); 1224 LIBBPF_API int bpf_object__load_skeleton(struct bpf_object_skeleton *s); 1225 LIBBPF_API int bpf_object__attach_skeleton(struct bpf_object_skeleton *s); 1226 LIBBPF_API void bpf_object__detach_skeleton(struct bpf_object_skeleton *s); 1227 LIBBPF_API void bpf_object__destroy_skeleton(struct bpf_object_skeleton *s); 1228 1229 struct gen_loader_opts { 1230 size_t sz; /* size of this struct, for forward/backward compatiblity */ 1231 const char *data; 1232 const char *insns; 1233 __u32 data_sz; 1234 __u32 insns_sz; 1235 }; 1236 1237 #define gen_loader_opts__last_field insns_sz 1238 LIBBPF_API int bpf_object__gen_loader(struct bpf_object *obj, 1239 struct gen_loader_opts *opts); 1240 1241 enum libbpf_tristate { 1242 TRI_NO = 0, 1243 TRI_YES = 1, 1244 TRI_MODULE = 2, 1245 }; 1246 1247 struct bpf_linker_opts { 1248 /* size of this struct, for forward/backward compatiblity */ 1249 size_t sz; 1250 }; 1251 #define bpf_linker_opts__last_field sz 1252 1253 struct bpf_linker_file_opts { 1254 /* size of this struct, for forward/backward compatiblity */ 1255 size_t sz; 1256 }; 1257 #define bpf_linker_file_opts__last_field sz 1258 1259 struct bpf_linker; 1260 1261 LIBBPF_API struct bpf_linker *bpf_linker__new(const char *filename, struct bpf_linker_opts *opts); 1262 LIBBPF_API int bpf_linker__add_file(struct bpf_linker *linker, 1263 const char *filename, 1264 const struct bpf_linker_file_opts *opts); 1265 LIBBPF_API int bpf_linker__finalize(struct bpf_linker *linker); 1266 LIBBPF_API void bpf_linker__free(struct bpf_linker *linker); 1267 1268 #ifdef __cplusplus 1269 } /* extern "C" */ 1270 #endif 1271 1272 #endif /* __LIBBPF_LIBBPF_H */ 1273