1/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */ 2 3/* 4 * Internal libbpf helpers. 5 * 6 * Copyright (c) 2019 Facebook 7 */ 8 9#ifndef __LIBBPF_LIBBPF_INTERNAL_H 10#define __LIBBPF_LIBBPF_INTERNAL_H 11 12#include <stdlib.h> 13#include <limits.h> 14#include <errno.h> 15#include <linux/err.h> 16#include <fcntl.h> 17#include <unistd.h> 18#include <sys/syscall.h> 19#include <libelf.h> 20#include "relo_core.h" 21 22/* Android's libc doesn't support AT_EACCESS in faccessat() implementation 23 * ([0]), and just returns -EINVAL even if file exists and is accessible. 24 * See [1] for issues caused by this. 25 * 26 * So just redefine it to 0 on Android. 27 * 28 * [0] https://android.googlesource.com/platform/bionic/+/refs/heads/android13-release/libc/bionic/faccessat.cpp#50 29 * [1] https://github.com/libbpf/libbpf-bootstrap/issues/250#issuecomment-1911324250 30 */ 31#ifdef __ANDROID__ 32#undef AT_EACCESS 33#define AT_EACCESS 0 34#endif 35 36/* make sure libbpf doesn't use kernel-only integer typedefs */ 37#pragma GCC poison u8 u16 u32 u64 s8 s16 s32 s64 38 39/* prevent accidental re-addition of reallocarray() */ 40#pragma GCC poison reallocarray 41 42#include "libbpf.h" 43#include "btf.h" 44 45#ifndef EM_BPF 46#define EM_BPF 247 47#endif 48 49#ifndef R_BPF_64_64 50#define R_BPF_64_64 1 51#endif 52#ifndef R_BPF_64_ABS64 53#define R_BPF_64_ABS64 2 54#endif 55#ifndef R_BPF_64_ABS32 56#define R_BPF_64_ABS32 3 57#endif 58#ifndef R_BPF_64_32 59#define R_BPF_64_32 10 60#endif 61 62#ifndef SHT_LLVM_ADDRSIG 63#define SHT_LLVM_ADDRSIG 0x6FFF4C03 64#endif 65 66/* if libelf is old and doesn't support mmap(), fall back to read() */ 67#ifndef ELF_C_READ_MMAP 68#define ELF_C_READ_MMAP ELF_C_READ 69#endif 70 71/* Older libelf all end up in this expression, for both 32 and 64 bit */ 72#ifndef ELF64_ST_VISIBILITY 73#define ELF64_ST_VISIBILITY(o) ((o) & 0x03) 74#endif 75 76#define BTF_INFO_ENC(kind, kind_flag, vlen) \ 77 ((!!(kind_flag) << 31) | ((kind) << 24) | ((vlen) & BTF_MAX_VLEN)) 78#define BTF_TYPE_ENC(name, info, size_or_type) (name), (info), (size_or_type) 79#define BTF_INT_ENC(encoding, bits_offset, nr_bits) \ 80 ((encoding) << 24 | (bits_offset) << 16 | (nr_bits)) 81#define BTF_TYPE_INT_ENC(name, encoding, bits_offset, bits, sz) \ 82 BTF_TYPE_ENC(name, BTF_INFO_ENC(BTF_KIND_INT, 0, 0), sz), \ 83 BTF_INT_ENC(encoding, bits_offset, bits) 84#define BTF_MEMBER_ENC(name, type, bits_offset) (name), (type), (bits_offset) 85#define BTF_PARAM_ENC(name, type) (name), (type) 86#define BTF_VAR_SECINFO_ENC(type, offset, size) (type), (offset), (size) 87#define BTF_TYPE_FLOAT_ENC(name, sz) \ 88 BTF_TYPE_ENC(name, BTF_INFO_ENC(BTF_KIND_FLOAT, 0, 0), sz) 89#define BTF_TYPE_DECL_TAG_ENC(value, type, component_idx) \ 90 BTF_TYPE_ENC(value, BTF_INFO_ENC(BTF_KIND_DECL_TAG, 0, 0), type), (component_idx) 91#define BTF_TYPE_TYPE_TAG_ENC(value, type) \ 92 BTF_TYPE_ENC(value, BTF_INFO_ENC(BTF_KIND_TYPE_TAG, 0, 0), type) 93 94#ifndef likely 95#define likely(x) __builtin_expect(!!(x), 1) 96#endif 97#ifndef unlikely 98#define unlikely(x) __builtin_expect(!!(x), 0) 99#endif 100#ifndef min 101# define min(x, y) ((x) < (y) ? (x) : (y)) 102#endif 103#ifndef max 104# define max(x, y) ((x) < (y) ? (y) : (x)) 105#endif 106#ifndef offsetofend 107# define offsetofend(TYPE, FIELD) \ 108 (offsetof(TYPE, FIELD) + sizeof(((TYPE *)0)->FIELD)) 109#endif 110#ifndef __alias 111#define __alias(symbol) __attribute__((alias(#symbol))) 112#endif 113 114/* Check whether a string `str` has prefix `pfx`, regardless if `pfx` is 115 * a string literal known at compilation time or char * pointer known only at 116 * runtime. 117 */ 118#define str_has_pfx(str, pfx) \ 119 (strncmp(str, pfx, __builtin_constant_p(pfx) ? sizeof(pfx) - 1 : strlen(pfx)) == 0) 120 121/* suffix check */ 122static inline bool str_has_sfx(const char *str, const char *sfx) 123{ 124 size_t str_len = strlen(str); 125 size_t sfx_len = strlen(sfx); 126 127 if (sfx_len > str_len) 128 return false; 129 return strcmp(str + str_len - sfx_len, sfx) == 0; 130} 131 132/* Symbol versioning is different between static and shared library. 133 * Properly versioned symbols are needed for shared library, but 134 * only the symbol of the new version is needed for static library. 135 * Starting with GNU C 10, use symver attribute instead of .symver assembler 136 * directive, which works better with GCC LTO builds. 137 */ 138#if defined(SHARED) && defined(__GNUC__) && __GNUC__ >= 10 139 140#define DEFAULT_VERSION(internal_name, api_name, version) \ 141 __attribute__((symver(#api_name "@@" #version))) 142#define COMPAT_VERSION(internal_name, api_name, version) \ 143 __attribute__((symver(#api_name "@" #version))) 144 145#elif defined(SHARED) 146 147#define COMPAT_VERSION(internal_name, api_name, version) \ 148 asm(".symver " #internal_name "," #api_name "@" #version); 149#define DEFAULT_VERSION(internal_name, api_name, version) \ 150 asm(".symver " #internal_name "," #api_name "@@" #version); 151 152#else /* !SHARED */ 153 154#define COMPAT_VERSION(internal_name, api_name, version) 155#define DEFAULT_VERSION(internal_name, api_name, version) \ 156 extern typeof(internal_name) api_name \ 157 __attribute__((alias(#internal_name))); 158 159#endif 160 161extern void libbpf_print(enum libbpf_print_level level, 162 const char *format, ...) 163 __attribute__((format(printf, 2, 3))); 164 165#define __pr(level, fmt, ...) \ 166do { \ 167 libbpf_print(level, "libbpf: " fmt, ##__VA_ARGS__); \ 168} while (0) 169 170#define pr_warn(fmt, ...) __pr(LIBBPF_WARN, fmt, ##__VA_ARGS__) 171#define pr_info(fmt, ...) __pr(LIBBPF_INFO, fmt, ##__VA_ARGS__) 172#define pr_debug(fmt, ...) __pr(LIBBPF_DEBUG, fmt, ##__VA_ARGS__) 173 174#ifndef __has_builtin 175#define __has_builtin(x) 0 176#endif 177 178struct bpf_link { 179 int (*detach)(struct bpf_link *link); 180 void (*dealloc)(struct bpf_link *link); 181 char *pin_path; /* NULL, if not pinned */ 182 int fd; /* hook FD, -1 if not applicable */ 183 bool disconnected; 184}; 185 186/* 187 * Re-implement glibc's reallocarray() for libbpf internal-only use. 188 * reallocarray(), unfortunately, is not available in all versions of glibc, 189 * so requires extra feature detection and using reallocarray() stub from 190 * <tools/libc_compat.h> and COMPAT_NEED_REALLOCARRAY. All this complicates 191 * build of libbpf unnecessarily and is just a maintenance burden. Instead, 192 * it's trivial to implement libbpf-specific internal version and use it 193 * throughout libbpf. 194 */ 195static inline void *libbpf_reallocarray(void *ptr, size_t nmemb, size_t size) 196{ 197 size_t total; 198 199#if __has_builtin(__builtin_mul_overflow) 200 if (unlikely(__builtin_mul_overflow(nmemb, size, &total))) 201 return NULL; 202#else 203 if (size == 0 || nmemb > ULONG_MAX / size) 204 return NULL; 205 total = nmemb * size; 206#endif 207 return realloc(ptr, total); 208} 209 210/* Copy up to sz - 1 bytes from zero-terminated src string and ensure that dst 211 * is zero-terminated string no matter what (unless sz == 0, in which case 212 * it's a no-op). It's conceptually close to FreeBSD's strlcpy(), but differs 213 * in what is returned. Given this is internal helper, it's trivial to extend 214 * this, when necessary. Use this instead of strncpy inside libbpf source code. 215 */ 216static inline void libbpf_strlcpy(char *dst, const char *src, size_t sz) 217{ 218 size_t i; 219 220 if (sz == 0) 221 return; 222 223 sz--; 224 for (i = 0; i < sz && src[i]; i++) 225 dst[i] = src[i]; 226 dst[i] = '\0'; 227} 228 229__u32 get_kernel_version(void); 230 231struct btf; 232struct btf_type; 233 234struct btf_type *btf_type_by_id(const struct btf *btf, __u32 type_id); 235const char *btf_kind_str(const struct btf_type *t); 236const struct btf_type *skip_mods_and_typedefs(const struct btf *btf, __u32 id, __u32 *res_id); 237 238static inline enum btf_func_linkage btf_func_linkage(const struct btf_type *t) 239{ 240 return (enum btf_func_linkage)(int)btf_vlen(t); 241} 242 243static inline __u32 btf_type_info(int kind, int vlen, int kflag) 244{ 245 return (kflag << 31) | (kind << 24) | vlen; 246} 247 248enum map_def_parts { 249 MAP_DEF_MAP_TYPE = 0x001, 250 MAP_DEF_KEY_TYPE = 0x002, 251 MAP_DEF_KEY_SIZE = 0x004, 252 MAP_DEF_VALUE_TYPE = 0x008, 253 MAP_DEF_VALUE_SIZE = 0x010, 254 MAP_DEF_MAX_ENTRIES = 0x020, 255 MAP_DEF_MAP_FLAGS = 0x040, 256 MAP_DEF_NUMA_NODE = 0x080, 257 MAP_DEF_PINNING = 0x100, 258 MAP_DEF_INNER_MAP = 0x200, 259 MAP_DEF_MAP_EXTRA = 0x400, 260 261 MAP_DEF_ALL = 0x7ff, /* combination of all above */ 262}; 263 264struct btf_map_def { 265 enum map_def_parts parts; 266 __u32 map_type; 267 __u32 key_type_id; 268 __u32 key_size; 269 __u32 value_type_id; 270 __u32 value_size; 271 __u32 max_entries; 272 __u32 map_flags; 273 __u32 numa_node; 274 __u32 pinning; 275 __u64 map_extra; 276}; 277 278int parse_btf_map_def(const char *map_name, struct btf *btf, 279 const struct btf_type *def_t, bool strict, 280 struct btf_map_def *map_def, struct btf_map_def *inner_def); 281 282void *libbpf_add_mem(void **data, size_t *cap_cnt, size_t elem_sz, 283 size_t cur_cnt, size_t max_cnt, size_t add_cnt); 284int libbpf_ensure_mem(void **data, size_t *cap_cnt, size_t elem_sz, size_t need_cnt); 285 286static inline bool libbpf_is_mem_zeroed(const char *p, ssize_t len) 287{ 288 while (len > 0) { 289 if (*p) 290 return false; 291 p++; 292 len--; 293 } 294 return true; 295} 296 297static inline bool libbpf_validate_opts(const char *opts, 298 size_t opts_sz, size_t user_sz, 299 const char *type_name) 300{ 301 if (user_sz < sizeof(size_t)) { 302 pr_warn("%s size (%zu) is too small\n", type_name, user_sz); 303 return false; 304 } 305 if (!libbpf_is_mem_zeroed(opts + opts_sz, (ssize_t)user_sz - opts_sz)) { 306 pr_warn("%s has non-zero extra bytes\n", type_name); 307 return false; 308 } 309 return true; 310} 311 312#define OPTS_VALID(opts, type) \ 313 (!(opts) || libbpf_validate_opts((const char *)opts, \ 314 offsetofend(struct type, \ 315 type##__last_field), \ 316 (opts)->sz, #type)) 317#define OPTS_HAS(opts, field) \ 318 ((opts) && opts->sz >= offsetofend(typeof(*(opts)), field)) 319#define OPTS_GET(opts, field, fallback_value) \ 320 (OPTS_HAS(opts, field) ? (opts)->field : fallback_value) 321#define OPTS_SET(opts, field, value) \ 322 do { \ 323 if (OPTS_HAS(opts, field)) \ 324 (opts)->field = value; \ 325 } while (0) 326 327#define OPTS_ZEROED(opts, last_nonzero_field) \ 328({ \ 329 ssize_t __off = offsetofend(typeof(*(opts)), last_nonzero_field); \ 330 !(opts) || libbpf_is_mem_zeroed((const void *)opts + __off, \ 331 (opts)->sz - __off); \ 332}) 333 334enum kern_feature_id { 335 /* v4.14: kernel support for program & map names. */ 336 FEAT_PROG_NAME, 337 /* v5.2: kernel support for global data sections. */ 338 FEAT_GLOBAL_DATA, 339 /* BTF support */ 340 FEAT_BTF, 341 /* BTF_KIND_FUNC and BTF_KIND_FUNC_PROTO support */ 342 FEAT_BTF_FUNC, 343 /* BTF_KIND_VAR and BTF_KIND_DATASEC support */ 344 FEAT_BTF_DATASEC, 345 /* BTF_FUNC_GLOBAL is supported */ 346 FEAT_BTF_GLOBAL_FUNC, 347 /* BPF_F_MMAPABLE is supported for arrays */ 348 FEAT_ARRAY_MMAP, 349 /* kernel support for expected_attach_type in BPF_PROG_LOAD */ 350 FEAT_EXP_ATTACH_TYPE, 351 /* bpf_probe_read_{kernel,user}[_str] helpers */ 352 FEAT_PROBE_READ_KERN, 353 /* BPF_PROG_BIND_MAP is supported */ 354 FEAT_PROG_BIND_MAP, 355 /* Kernel support for module BTFs */ 356 FEAT_MODULE_BTF, 357 /* BTF_KIND_FLOAT support */ 358 FEAT_BTF_FLOAT, 359 /* BPF perf link support */ 360 FEAT_PERF_LINK, 361 /* BTF_KIND_DECL_TAG support */ 362 FEAT_BTF_DECL_TAG, 363 /* BTF_KIND_TYPE_TAG support */ 364 FEAT_BTF_TYPE_TAG, 365 /* memcg-based accounting for BPF maps and progs */ 366 FEAT_MEMCG_ACCOUNT, 367 /* BPF cookie (bpf_get_attach_cookie() BPF helper) support */ 368 FEAT_BPF_COOKIE, 369 /* BTF_KIND_ENUM64 support and BTF_KIND_ENUM kflag support */ 370 FEAT_BTF_ENUM64, 371 /* Kernel uses syscall wrapper (CONFIG_ARCH_HAS_SYSCALL_WRAPPER) */ 372 FEAT_SYSCALL_WRAPPER, 373 /* BPF multi-uprobe link support */ 374 FEAT_UPROBE_MULTI_LINK, 375 /* Kernel supports arg:ctx tag (__arg_ctx) for global subprogs natively */ 376 FEAT_ARG_CTX_TAG, 377 /* Kernel supports '?' at the front of datasec names */ 378 FEAT_BTF_QMARK_DATASEC, 379 __FEAT_CNT, 380}; 381 382enum kern_feature_result { 383 FEAT_UNKNOWN = 0, 384 FEAT_SUPPORTED = 1, 385 FEAT_MISSING = 2, 386}; 387 388struct kern_feature_cache { 389 enum kern_feature_result res[__FEAT_CNT]; 390 int token_fd; 391}; 392 393bool feat_supported(struct kern_feature_cache *cache, enum kern_feature_id feat_id); 394bool kernel_supports(const struct bpf_object *obj, enum kern_feature_id feat_id); 395 396int probe_kern_syscall_wrapper(int token_fd); 397int probe_memcg_account(int token_fd); 398int bump_rlimit_memlock(void); 399 400int parse_cpu_mask_str(const char *s, bool **mask, int *mask_sz); 401int parse_cpu_mask_file(const char *fcpu, bool **mask, int *mask_sz); 402int libbpf__load_raw_btf(const char *raw_types, size_t types_len, 403 const char *str_sec, size_t str_len, 404 int token_fd); 405int btf_load_into_kernel(struct btf *btf, 406 char *log_buf, size_t log_sz, __u32 log_level, 407 int token_fd); 408 409struct btf *btf_get_from_fd(int btf_fd, struct btf *base_btf); 410void btf_get_kernel_prefix_kind(enum bpf_attach_type attach_type, 411 const char **prefix, int *kind); 412 413struct btf_ext_info { 414 /* 415 * info points to the individual info section (e.g. func_info and 416 * line_info) from the .BTF.ext. It does not include the __u32 rec_size. 417 */ 418 void *info; 419 __u32 rec_size; 420 __u32 len; 421 /* optional (maintained internally by libbpf) mapping between .BTF.ext 422 * section and corresponding ELF section. This is used to join 423 * information like CO-RE relocation records with corresponding BPF 424 * programs defined in ELF sections 425 */ 426 __u32 *sec_idxs; 427 int sec_cnt; 428}; 429 430#define for_each_btf_ext_sec(seg, sec) \ 431 for (sec = (seg)->info; \ 432 (void *)sec < (seg)->info + (seg)->len; \ 433 sec = (void *)sec + sizeof(struct btf_ext_info_sec) + \ 434 (seg)->rec_size * sec->num_info) 435 436#define for_each_btf_ext_rec(seg, sec, i, rec) \ 437 for (i = 0, rec = (void *)&(sec)->data; \ 438 i < (sec)->num_info; \ 439 i++, rec = (void *)rec + (seg)->rec_size) 440 441/* 442 * The .BTF.ext ELF section layout defined as 443 * struct btf_ext_header 444 * func_info subsection 445 * 446 * The func_info subsection layout: 447 * record size for struct bpf_func_info in the func_info subsection 448 * struct btf_sec_func_info for section #1 449 * a list of bpf_func_info records for section #1 450 * where struct bpf_func_info mimics one in include/uapi/linux/bpf.h 451 * but may not be identical 452 * struct btf_sec_func_info for section #2 453 * a list of bpf_func_info records for section #2 454 * ...... 455 * 456 * Note that the bpf_func_info record size in .BTF.ext may not 457 * be the same as the one defined in include/uapi/linux/bpf.h. 458 * The loader should ensure that record_size meets minimum 459 * requirement and pass the record as is to the kernel. The 460 * kernel will handle the func_info properly based on its contents. 461 */ 462struct btf_ext_header { 463 __u16 magic; 464 __u8 version; 465 __u8 flags; 466 __u32 hdr_len; 467 468 /* All offsets are in bytes relative to the end of this header */ 469 __u32 func_info_off; 470 __u32 func_info_len; 471 __u32 line_info_off; 472 __u32 line_info_len; 473 474 /* optional part of .BTF.ext header */ 475 __u32 core_relo_off; 476 __u32 core_relo_len; 477}; 478 479struct btf_ext { 480 union { 481 struct btf_ext_header *hdr; 482 void *data; 483 }; 484 struct btf_ext_info func_info; 485 struct btf_ext_info line_info; 486 struct btf_ext_info core_relo_info; 487 __u32 data_size; 488}; 489 490struct btf_ext_info_sec { 491 __u32 sec_name_off; 492 __u32 num_info; 493 /* Followed by num_info * record_size number of bytes */ 494 __u8 data[]; 495}; 496 497/* The minimum bpf_func_info checked by the loader */ 498struct bpf_func_info_min { 499 __u32 insn_off; 500 __u32 type_id; 501}; 502 503/* The minimum bpf_line_info checked by the loader */ 504struct bpf_line_info_min { 505 __u32 insn_off; 506 __u32 file_name_off; 507 __u32 line_off; 508 __u32 line_col; 509}; 510 511 512typedef int (*type_id_visit_fn)(__u32 *type_id, void *ctx); 513typedef int (*str_off_visit_fn)(__u32 *str_off, void *ctx); 514int btf_type_visit_type_ids(struct btf_type *t, type_id_visit_fn visit, void *ctx); 515int btf_type_visit_str_offs(struct btf_type *t, str_off_visit_fn visit, void *ctx); 516int btf_ext_visit_type_ids(struct btf_ext *btf_ext, type_id_visit_fn visit, void *ctx); 517int btf_ext_visit_str_offs(struct btf_ext *btf_ext, str_off_visit_fn visit, void *ctx); 518__s32 btf__find_by_name_kind_own(const struct btf *btf, const char *type_name, 519 __u32 kind); 520 521typedef int (*kallsyms_cb_t)(unsigned long long sym_addr, char sym_type, 522 const char *sym_name, void *ctx); 523 524int libbpf_kallsyms_parse(kallsyms_cb_t cb, void *arg); 525 526/* handle direct returned errors */ 527static inline int libbpf_err(int ret) 528{ 529 if (ret < 0) 530 errno = -ret; 531 return ret; 532} 533 534/* handle errno-based (e.g., syscall or libc) errors according to libbpf's 535 * strict mode settings 536 */ 537static inline int libbpf_err_errno(int ret) 538{ 539 /* errno is already assumed to be set on error */ 540 return ret < 0 ? -errno : ret; 541} 542 543/* handle error for pointer-returning APIs, err is assumed to be < 0 always */ 544static inline void *libbpf_err_ptr(int err) 545{ 546 /* set errno on error, this doesn't break anything */ 547 errno = -err; 548 return NULL; 549} 550 551/* handle pointer-returning APIs' error handling */ 552static inline void *libbpf_ptr(void *ret) 553{ 554 /* set errno on error, this doesn't break anything */ 555 if (IS_ERR(ret)) 556 errno = -PTR_ERR(ret); 557 558 return IS_ERR(ret) ? NULL : ret; 559} 560 561static inline bool str_is_empty(const char *s) 562{ 563 return !s || !s[0]; 564} 565 566static inline bool is_ldimm64_insn(struct bpf_insn *insn) 567{ 568 return insn->code == (BPF_LD | BPF_IMM | BPF_DW); 569} 570 571/* Unconditionally dup FD, ensuring it doesn't use [0, 2] range. 572 * Original FD is not closed or altered in any other way. 573 * Preserves original FD value, if it's invalid (negative). 574 */ 575static inline int dup_good_fd(int fd) 576{ 577 if (fd < 0) 578 return fd; 579 return fcntl(fd, F_DUPFD_CLOEXEC, 3); 580} 581 582/* if fd is stdin, stdout, or stderr, dup to a fd greater than 2 583 * Takes ownership of the fd passed in, and closes it if calling 584 * fcntl(fd, F_DUPFD_CLOEXEC, 3). 585 */ 586static inline int ensure_good_fd(int fd) 587{ 588 int old_fd = fd, saved_errno; 589 590 if (fd < 0) 591 return fd; 592 if (fd < 3) { 593 fd = dup_good_fd(fd); 594 saved_errno = errno; 595 close(old_fd); 596 errno = saved_errno; 597 if (fd < 0) { 598 pr_warn("failed to dup FD %d to FD > 2: %d\n", old_fd, -saved_errno); 599 errno = saved_errno; 600 } 601 } 602 return fd; 603} 604 605static inline int sys_dup2(int oldfd, int newfd) 606{ 607#ifdef __NR_dup2 608 return syscall(__NR_dup2, oldfd, newfd); 609#else 610 return syscall(__NR_dup3, oldfd, newfd, 0); 611#endif 612} 613 614/* Point *fixed_fd* to the same file that *tmp_fd* points to. 615 * Regardless of success, *tmp_fd* is closed. 616 * Whatever *fixed_fd* pointed to is closed silently. 617 */ 618static inline int reuse_fd(int fixed_fd, int tmp_fd) 619{ 620 int err; 621 622 err = sys_dup2(tmp_fd, fixed_fd); 623 err = err < 0 ? -errno : 0; 624 close(tmp_fd); /* clean up temporary FD */ 625 return err; 626} 627 628/* The following two functions are exposed to bpftool */ 629int bpf_core_add_cands(struct bpf_core_cand *local_cand, 630 size_t local_essent_len, 631 const struct btf *targ_btf, 632 const char *targ_btf_name, 633 int targ_start_id, 634 struct bpf_core_cand_list *cands); 635void bpf_core_free_cands(struct bpf_core_cand_list *cands); 636 637struct usdt_manager *usdt_manager_new(struct bpf_object *obj); 638void usdt_manager_free(struct usdt_manager *man); 639struct bpf_link * usdt_manager_attach_usdt(struct usdt_manager *man, 640 const struct bpf_program *prog, 641 pid_t pid, const char *path, 642 const char *usdt_provider, const char *usdt_name, 643 __u64 usdt_cookie); 644 645static inline bool is_pow_of_2(size_t x) 646{ 647 return x && (x & (x - 1)) == 0; 648} 649 650#define PROG_LOAD_ATTEMPTS 5 651int sys_bpf_prog_load(union bpf_attr *attr, unsigned int size, int attempts); 652 653bool glob_match(const char *str, const char *pat); 654 655long elf_find_func_offset(Elf *elf, const char *binary_path, const char *name); 656long elf_find_func_offset_from_file(const char *binary_path, const char *name); 657 658struct elf_fd { 659 Elf *elf; 660 int fd; 661}; 662 663int elf_open(const char *binary_path, struct elf_fd *elf_fd); 664void elf_close(struct elf_fd *elf_fd); 665 666int elf_resolve_syms_offsets(const char *binary_path, int cnt, 667 const char **syms, unsigned long **poffsets, 668 int st_type); 669int elf_resolve_pattern_offsets(const char *binary_path, const char *pattern, 670 unsigned long **poffsets, size_t *pcnt); 671 672int probe_fd(int fd); 673 674#endif /* __LIBBPF_LIBBPF_INTERNAL_H */ 675