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 19#if defined HAVE_LIBELF 20#include <libelf.h> 21#include <gelf.h> 22#endif // 23 24#ifdef HAVE_ELFIO 25#include "elfio_c_wrapper.h" 26#include <linux/memfd.h> 27#include <sys/syscall.h> 28#include <limits.h> 29typedef struct Elf64_Ehdr Elf64_Ehdr; 30typedef struct Elf64_Shdr Elf64_Shdr; 31typedef struct Elf64_Sym Elf64_Sym; 32typedef Elf64_Sym GElf_Sym; 33typedef struct Elf64_Shdr GElf_Shdr; 34typedef struct Elf64_Rel Elf64_Rel; 35typedef Elf64_Half GElf_Versym ; 36typedef struct { 37 void *d_buf; 38 size_t d_size; 39} Elf_Data; 40 41typedef struct { 42 Elf64_Word vda_name; /* Version or dependency names */ 43 Elf64_Word vda_next; /* Offset in bytes to next verdaux entry */ 44} GElf_Verdaux; 45 46typedef struct { 47 Elf64_Half vd_version; /* Version revision */ 48 Elf64_Half vd_flags; /* Version information */ 49 Elf64_Half vd_ndx; /* Version Index */ 50 Elf64_Half vd_cnt; /* Number of associated aux entries */ 51 Elf64_Word vd_hash; /* Version name hash value */ 52 Elf64_Word vd_aux; /* Offset in bytes to verdaux array */ 53 Elf64_Word vd_next; /* Offset in bytes to next verdef entry */ 54} GElf_Verdef; 55 56#define ELF64_ST_TYPE(val) ELF_ST_TYPE (val) 57#define ELF64_ST_BIND(val) ELF_ST_BIND (val) 58#define GELF_ST_BIND(val) ELF64_ST_BIND (val) 59#define elf_errmsg(val) "error" 60#define SHT_GNU_versym 0x6fffffff 61#define SHT_GNU_verdef 0x6ffffffd 62#endif 63 64#include "relo_core.h" 65 66/* make sure libbpf doesn't use kernel-only integer typedefs */ 67#pragma GCC poison u8 u16 u32 u64 s8 s16 s32 s64 68 69/* prevent accidental re-addition of reallocarray() */ 70#pragma GCC poison reallocarray 71 72#include "libbpf.h" 73#include "btf.h" 74 75#ifndef EM_BPF 76#define EM_BPF 247 77#endif 78 79#ifndef R_BPF_64_64 80#define R_BPF_64_64 1 81#endif 82#ifndef R_BPF_64_ABS64 83#define R_BPF_64_ABS64 2 84#endif 85#ifndef R_BPF_64_ABS32 86#define R_BPF_64_ABS32 3 87#endif 88#ifndef R_BPF_64_32 89#define R_BPF_64_32 10 90#endif 91 92#ifndef SHT_LLVM_ADDRSIG 93#define SHT_LLVM_ADDRSIG 0x6FFF4C03 94#endif 95 96/* if libelf is old and doesn't support mmap(), fall back to read() */ 97#ifndef ELF_C_READ_MMAP 98#define ELF_C_READ_MMAP ELF_C_READ 99#endif 100 101/* Older libelf all end up in this expression, for both 32 and 64 bit */ 102#ifndef ELF64_ST_VISIBILITY 103#define ELF64_ST_VISIBILITY(o) ((o) & 0x03) 104#endif 105 106#define BTF_INFO_ENC(kind, kind_flag, vlen) \ 107 ((!!(kind_flag) << 31) | ((kind) << 24) | ((vlen) & BTF_MAX_VLEN)) 108#define BTF_TYPE_ENC(name, info, size_or_type) (name), (info), (size_or_type) 109#define BTF_INT_ENC(encoding, bits_offset, nr_bits) \ 110 ((encoding) << 24 | (bits_offset) << 16 | (nr_bits)) 111#define BTF_TYPE_INT_ENC(name, encoding, bits_offset, bits, sz) \ 112 BTF_TYPE_ENC(name, BTF_INFO_ENC(BTF_KIND_INT, 0, 0), sz), \ 113 BTF_INT_ENC(encoding, bits_offset, bits) 114#define BTF_MEMBER_ENC(name, type, bits_offset) (name), (type), (bits_offset) 115#define BTF_PARAM_ENC(name, type) (name), (type) 116#define BTF_VAR_SECINFO_ENC(type, offset, size) (type), (offset), (size) 117#define BTF_TYPE_FLOAT_ENC(name, sz) \ 118 BTF_TYPE_ENC(name, BTF_INFO_ENC(BTF_KIND_FLOAT, 0, 0), sz) 119#define BTF_TYPE_DECL_TAG_ENC(value, type, component_idx) \ 120 BTF_TYPE_ENC(value, BTF_INFO_ENC(BTF_KIND_DECL_TAG, 0, 0), type), (component_idx) 121#define BTF_TYPE_TYPE_TAG_ENC(value, type) \ 122 BTF_TYPE_ENC(value, BTF_INFO_ENC(BTF_KIND_TYPE_TAG, 0, 0), type) 123 124#ifndef likely 125#define likely(x) __builtin_expect(!!(x), 1) 126#endif 127#ifndef unlikely 128#define unlikely(x) __builtin_expect(!!(x), 0) 129#endif 130#ifndef min 131# define min(x, y) ((x) < (y) ? (x) : (y)) 132#endif 133#ifndef max 134# define max(x, y) ((x) < (y) ? (y) : (x)) 135#endif 136#ifndef offsetofend 137# define offsetofend(TYPE, FIELD) \ 138 (offsetof(TYPE, FIELD) + sizeof(((TYPE *)0)->FIELD)) 139#endif 140#ifndef __alias 141#define __alias(symbol) __attribute__((alias(#symbol))) 142#endif 143 144/* Check whether a string `str` has prefix `pfx`, regardless if `pfx` is 145 * a string literal known at compilation time or char * pointer known only at 146 * runtime. 147 */ 148#define str_has_pfx(str, pfx) \ 149 (strncmp(str, pfx, __builtin_constant_p(pfx) ? sizeof(pfx) - 1 : strlen(pfx)) == 0) 150 151/* suffix check */ 152static inline bool str_has_sfx(const char *str, const char *sfx) 153{ 154 size_t str_len = strlen(str); 155 size_t sfx_len = strlen(sfx); 156 157 if (sfx_len > str_len) 158 return false; 159 return strcmp(str + str_len - sfx_len, sfx) == 0; 160} 161 162/* Symbol versioning is different between static and shared library. 163 * Properly versioned symbols are needed for shared library, but 164 * only the symbol of the new version is needed for static library. 165 * Starting with GNU C 10, use symver attribute instead of .symver assembler 166 * directive, which works better with GCC LTO builds. 167 */ 168#if defined(SHARED) && defined(__GNUC__) && __GNUC__ >= 10 169 170#define DEFAULT_VERSION(internal_name, api_name, version) \ 171 __attribute__((symver(#api_name "@@" #version))) 172#define COMPAT_VERSION(internal_name, api_name, version) \ 173 __attribute__((symver(#api_name "@" #version))) 174 175#elif defined(SHARED) 176 177#define COMPAT_VERSION(internal_name, api_name, version) \ 178 asm(".symver " #internal_name "," #api_name "@" #version); 179#define DEFAULT_VERSION(internal_name, api_name, version) \ 180 asm(".symver " #internal_name "," #api_name "@@" #version); 181 182#else /* !SHARED */ 183 184#define COMPAT_VERSION(internal_name, api_name, version) 185#define DEFAULT_VERSION(internal_name, api_name, version) \ 186 extern typeof(internal_name) api_name \ 187 __attribute__((alias(#internal_name))); 188 189#endif 190 191extern void libbpf_print(enum libbpf_print_level level, 192 const char *format, ...) 193 __attribute__((format(printf, 2, 3))); 194 195#define __pr(level, fmt, ...) \ 196do { \ 197 libbpf_print(level, "libbpf: " fmt, ##__VA_ARGS__); \ 198} while (0) 199 200#define pr_warn(fmt, ...) __pr(LIBBPF_WARN, fmt, ##__VA_ARGS__) 201#define pr_info(fmt, ...) __pr(LIBBPF_INFO, fmt, ##__VA_ARGS__) 202#define pr_debug(fmt, ...) __pr(LIBBPF_DEBUG, fmt, ##__VA_ARGS__) 203 204#ifndef __has_builtin 205#define __has_builtin(x) 0 206#endif 207 208struct bpf_link { 209 int (*detach)(struct bpf_link *link); 210 void (*dealloc)(struct bpf_link *link); 211 char *pin_path; /* NULL, if not pinned */ 212 int fd; /* hook FD, -1 if not applicable */ 213 bool disconnected; 214}; 215 216/* 217 * Re-implement glibc's reallocarray() for libbpf internal-only use. 218 * reallocarray(), unfortunately, is not available in all versions of glibc, 219 * so requires extra feature detection and using reallocarray() stub from 220 * <tools/libc_compat.h> and COMPAT_NEED_REALLOCARRAY. All this complicates 221 * build of libbpf unnecessarily and is just a maintenance burden. Instead, 222 * it's trivial to implement libbpf-specific internal version and use it 223 * throughout libbpf. 224 */ 225static inline void *libbpf_reallocarray(void *ptr, size_t nmemb, size_t size) 226{ 227 size_t total; 228 229#if __has_builtin(__builtin_mul_overflow) 230 if (unlikely(__builtin_mul_overflow(nmemb, size, &total))) 231 return NULL; 232#else 233 if (size == 0 || nmemb > ULONG_MAX / size) 234 return NULL; 235 total = nmemb * size; 236#endif 237 return realloc(ptr, total); 238} 239 240/* Copy up to sz - 1 bytes from zero-terminated src string and ensure that dst 241 * is zero-terminated string no matter what (unless sz == 0, in which case 242 * it's a no-op). It's conceptually close to FreeBSD's strlcpy(), but differs 243 * in what is returned. Given this is internal helper, it's trivial to extend 244 * this, when necessary. Use this instead of strncpy inside libbpf source code. 245 */ 246static inline void libbpf_strlcpy(char *dst, const char *src, size_t sz) 247{ 248 size_t i; 249 250 if (sz == 0) 251 return; 252 253 sz--; 254 for (i = 0; i < sz && src[i]; i++) 255 dst[i] = src[i]; 256 dst[i] = '\0'; 257} 258 259__u32 get_kernel_version(void); 260 261struct btf; 262struct btf_type; 263 264struct btf_type *btf_type_by_id(const struct btf *btf, __u32 type_id); 265const char *btf_kind_str(const struct btf_type *t); 266const struct btf_type *skip_mods_and_typedefs(const struct btf *btf, __u32 id, __u32 *res_id); 267 268static inline enum btf_func_linkage btf_func_linkage(const struct btf_type *t) 269{ 270 return (enum btf_func_linkage)(int)btf_vlen(t); 271} 272 273static inline __u32 btf_type_info(int kind, int vlen, int kflag) 274{ 275 return (kflag << 31) | (kind << 24) | vlen; 276} 277 278enum map_def_parts { 279 MAP_DEF_MAP_TYPE = 0x001, 280 MAP_DEF_KEY_TYPE = 0x002, 281 MAP_DEF_KEY_SIZE = 0x004, 282 MAP_DEF_VALUE_TYPE = 0x008, 283 MAP_DEF_VALUE_SIZE = 0x010, 284 MAP_DEF_MAX_ENTRIES = 0x020, 285 MAP_DEF_MAP_FLAGS = 0x040, 286 MAP_DEF_NUMA_NODE = 0x080, 287 MAP_DEF_PINNING = 0x100, 288 MAP_DEF_INNER_MAP = 0x200, 289 MAP_DEF_MAP_EXTRA = 0x400, 290 291 MAP_DEF_ALL = 0x7ff, /* combination of all above */ 292}; 293 294struct btf_map_def { 295 enum map_def_parts parts; 296 __u32 map_type; 297 __u32 key_type_id; 298 __u32 key_size; 299 __u32 value_type_id; 300 __u32 value_size; 301 __u32 max_entries; 302 __u32 map_flags; 303 __u32 numa_node; 304 __u32 pinning; 305 __u64 map_extra; 306}; 307 308int parse_btf_map_def(const char *map_name, struct btf *btf, 309 const struct btf_type *def_t, bool strict, 310 struct btf_map_def *map_def, struct btf_map_def *inner_def); 311 312void *libbpf_add_mem(void **data, size_t *cap_cnt, size_t elem_sz, 313 size_t cur_cnt, size_t max_cnt, size_t add_cnt); 314int libbpf_ensure_mem(void **data, size_t *cap_cnt, size_t elem_sz, size_t need_cnt); 315 316static inline bool libbpf_is_mem_zeroed(const char *p, ssize_t len) 317{ 318 while (len > 0) { 319 if (*p) 320 return false; 321 p++; 322 len--; 323 } 324 return true; 325} 326 327static inline bool libbpf_validate_opts(const char *opts, 328 size_t opts_sz, size_t user_sz, 329 const char *type_name) 330{ 331 if (user_sz < sizeof(size_t)) { 332 pr_warn("%s size (%zu) is too small\n", type_name, user_sz); 333 return false; 334 } 335 if (!libbpf_is_mem_zeroed(opts + opts_sz, (ssize_t)user_sz - opts_sz)) { 336 pr_warn("%s has non-zero extra bytes\n", type_name); 337 return false; 338 } 339 return true; 340} 341 342#define OPTS_VALID(opts, type) \ 343 (!(opts) || libbpf_validate_opts((const char *)opts, \ 344 offsetofend(struct type, \ 345 type##__last_field), \ 346 (opts)->sz, #type)) 347#define OPTS_HAS(opts, field) \ 348 ((opts) && opts->sz >= offsetofend(typeof(*(opts)), field)) 349#define OPTS_GET(opts, field, fallback_value) \ 350 (OPTS_HAS(opts, field) ? (opts)->field : fallback_value) 351#define OPTS_SET(opts, field, value) \ 352 do { \ 353 if (OPTS_HAS(opts, field)) \ 354 (opts)->field = value; \ 355 } while (0) 356 357#define OPTS_ZEROED(opts, last_nonzero_field) \ 358({ \ 359 ssize_t __off = offsetofend(typeof(*(opts)), last_nonzero_field); \ 360 !(opts) || libbpf_is_mem_zeroed((const void *)opts + __off, \ 361 (opts)->sz - __off); \ 362}) 363 364enum kern_feature_id { 365 /* v4.14: kernel support for program & map names. */ 366 FEAT_PROG_NAME, 367 /* v5.2: kernel support for global data sections. */ 368 FEAT_GLOBAL_DATA, 369 /* BTF support */ 370 FEAT_BTF, 371 /* BTF_KIND_FUNC and BTF_KIND_FUNC_PROTO support */ 372 FEAT_BTF_FUNC, 373 /* BTF_KIND_VAR and BTF_KIND_DATASEC support */ 374 FEAT_BTF_DATASEC, 375 /* BTF_FUNC_GLOBAL is supported */ 376 FEAT_BTF_GLOBAL_FUNC, 377 /* BPF_F_MMAPABLE is supported for arrays */ 378 FEAT_ARRAY_MMAP, 379 /* kernel support for expected_attach_type in BPF_PROG_LOAD */ 380 FEAT_EXP_ATTACH_TYPE, 381 /* bpf_probe_read_{kernel,user}[_str] helpers */ 382 FEAT_PROBE_READ_KERN, 383 /* BPF_PROG_BIND_MAP is supported */ 384 FEAT_PROG_BIND_MAP, 385 /* Kernel support for module BTFs */ 386 FEAT_MODULE_BTF, 387 /* BTF_KIND_FLOAT support */ 388 FEAT_BTF_FLOAT, 389 /* BPF perf link support */ 390 FEAT_PERF_LINK, 391 /* BTF_KIND_DECL_TAG support */ 392 FEAT_BTF_DECL_TAG, 393 /* BTF_KIND_TYPE_TAG support */ 394 FEAT_BTF_TYPE_TAG, 395 /* memcg-based accounting for BPF maps and progs */ 396 FEAT_MEMCG_ACCOUNT, 397 /* BPF cookie (bpf_get_attach_cookie() BPF helper) support */ 398 FEAT_BPF_COOKIE, 399 /* BTF_KIND_ENUM64 support and BTF_KIND_ENUM kflag support */ 400 FEAT_BTF_ENUM64, 401 /* Kernel uses syscall wrapper (CONFIG_ARCH_HAS_SYSCALL_WRAPPER) */ 402 FEAT_SYSCALL_WRAPPER, 403 /* BPF multi-uprobe link support */ 404 FEAT_UPROBE_MULTI_LINK, 405 __FEAT_CNT, 406}; 407 408int probe_memcg_account(void); 409bool kernel_supports(const struct bpf_object *obj, enum kern_feature_id feat_id); 410int bump_rlimit_memlock(void); 411 412int parse_cpu_mask_str(const char *s, bool **mask, int *mask_sz); 413int parse_cpu_mask_file(const char *fcpu, bool **mask, int *mask_sz); 414int libbpf__load_raw_btf(const char *raw_types, size_t types_len, 415 const char *str_sec, size_t str_len); 416int btf_load_into_kernel(struct btf *btf, char *log_buf, size_t log_sz, __u32 log_level); 417 418struct btf *btf_get_from_fd(int btf_fd, struct btf *base_btf); 419void btf_get_kernel_prefix_kind(enum bpf_attach_type attach_type, 420 const char **prefix, int *kind); 421 422struct btf_ext_info { 423 /* 424 * info points to the individual info section (e.g. func_info and 425 * line_info) from the .BTF.ext. It does not include the __u32 rec_size. 426 */ 427 void *info; 428 __u32 rec_size; 429 __u32 len; 430 /* optional (maintained internally by libbpf) mapping between .BTF.ext 431 * section and corresponding ELF section. This is used to join 432 * information like CO-RE relocation records with corresponding BPF 433 * programs defined in ELF sections 434 */ 435 __u32 *sec_idxs; 436 int sec_cnt; 437}; 438 439#define for_each_btf_ext_sec(seg, sec) \ 440 for (sec = (seg)->info; \ 441 (void *)sec < (seg)->info + (seg)->len; \ 442 sec = (void *)sec + sizeof(struct btf_ext_info_sec) + \ 443 (seg)->rec_size * sec->num_info) 444 445#define for_each_btf_ext_rec(seg, sec, i, rec) \ 446 for (i = 0, rec = (void *)&(sec)->data; \ 447 i < (sec)->num_info; \ 448 i++, rec = (void *)rec + (seg)->rec_size) 449 450/* 451 * The .BTF.ext ELF section layout defined as 452 * struct btf_ext_header 453 * func_info subsection 454 * 455 * The func_info subsection layout: 456 * record size for struct bpf_func_info in the func_info subsection 457 * struct btf_sec_func_info for section #1 458 * a list of bpf_func_info records for section #1 459 * where struct bpf_func_info mimics one in include/uapi/linux/bpf.h 460 * but may not be identical 461 * struct btf_sec_func_info for section #2 462 * a list of bpf_func_info records for section #2 463 * ...... 464 * 465 * Note that the bpf_func_info record size in .BTF.ext may not 466 * be the same as the one defined in include/uapi/linux/bpf.h. 467 * The loader should ensure that record_size meets minimum 468 * requirement and pass the record as is to the kernel. The 469 * kernel will handle the func_info properly based on its contents. 470 */ 471struct btf_ext_header { 472 __u16 magic; 473 __u8 version; 474 __u8 flags; 475 __u32 hdr_len; 476 477 /* All offsets are in bytes relative to the end of this header */ 478 __u32 func_info_off; 479 __u32 func_info_len; 480 __u32 line_info_off; 481 __u32 line_info_len; 482 483 /* optional part of .BTF.ext header */ 484 __u32 core_relo_off; 485 __u32 core_relo_len; 486}; 487 488struct btf_ext { 489 union { 490 struct btf_ext_header *hdr; 491 void *data; 492 }; 493 struct btf_ext_info func_info; 494 struct btf_ext_info line_info; 495 struct btf_ext_info core_relo_info; 496 __u32 data_size; 497}; 498 499struct btf_ext_info_sec { 500 __u32 sec_name_off; 501 __u32 num_info; 502 /* Followed by num_info * record_size number of bytes */ 503 __u8 data[]; 504}; 505 506/* The minimum bpf_func_info checked by the loader */ 507struct bpf_func_info_min { 508 __u32 insn_off; 509 __u32 type_id; 510}; 511 512/* The minimum bpf_line_info checked by the loader */ 513struct bpf_line_info_min { 514 __u32 insn_off; 515 __u32 file_name_off; 516 __u32 line_off; 517 __u32 line_col; 518}; 519 520struct elf_sym { 521 const char *name; 522 GElf_Sym sym; 523 GElf_Shdr sh; 524 int ver; 525 bool hidden; 526}; 527 528struct elf_sym_iter { 529#ifdef HAVE_LIBELF 530 Elf *elf; 531#elif HAVE_ELFIO 532 pelfio_t elf; 533 psection_t symsSec; 534#endif 535 Elf_Data *syms; 536 Elf_Data *versyms; 537 Elf_Data *verdefs; 538 size_t nr_syms; 539 size_t strtabidx; 540 size_t verdef_strtabidx; 541 size_t next_sym_idx; 542 struct elf_sym sym; 543 int st_type; 544}; 545 546 547 548typedef int (*type_id_visit_fn)(__u32 *type_id, void *ctx); 549typedef int (*str_off_visit_fn)(__u32 *str_off, void *ctx); 550int btf_type_visit_type_ids(struct btf_type *t, type_id_visit_fn visit, void *ctx); 551int btf_type_visit_str_offs(struct btf_type *t, str_off_visit_fn visit, void *ctx); 552int btf_ext_visit_type_ids(struct btf_ext *btf_ext, type_id_visit_fn visit, void *ctx); 553int btf_ext_visit_str_offs(struct btf_ext *btf_ext, str_off_visit_fn visit, void *ctx); 554__s32 btf__find_by_name_kind_own(const struct btf *btf, const char *type_name, 555 __u32 kind); 556 557typedef int (*kallsyms_cb_t)(unsigned long long sym_addr, char sym_type, 558 const char *sym_name, void *ctx); 559 560int libbpf_kallsyms_parse(kallsyms_cb_t cb, void *arg); 561 562/* handle direct returned errors */ 563static inline int libbpf_err(int ret) 564{ 565 if (ret < 0) 566 errno = -ret; 567 return ret; 568} 569 570/* handle errno-based (e.g., syscall or libc) errors according to libbpf's 571 * strict mode settings 572 */ 573static inline int libbpf_err_errno(int ret) 574{ 575 /* errno is already assumed to be set on error */ 576 return ret < 0 ? -errno : ret; 577} 578 579/* handle error for pointer-returning APIs, err is assumed to be < 0 always */ 580static inline void *libbpf_err_ptr(int err) 581{ 582 /* set errno on error, this doesn't break anything */ 583 errno = -err; 584 return NULL; 585} 586 587/* handle pointer-returning APIs' error handling */ 588static inline void *libbpf_ptr(void *ret) 589{ 590 /* set errno on error, this doesn't break anything */ 591 if (IS_ERR(ret)) 592 errno = -PTR_ERR(ret); 593 594 return IS_ERR(ret) ? NULL : ret; 595} 596 597static inline bool str_is_empty(const char *s) 598{ 599 return !s || !s[0]; 600} 601 602static inline bool is_ldimm64_insn(struct bpf_insn *insn) 603{ 604 return insn->code == (BPF_LD | BPF_IMM | BPF_DW); 605} 606 607/* if fd is stdin, stdout, or stderr, dup to a fd greater than 2 608 * Takes ownership of the fd passed in, and closes it if calling 609 * fcntl(fd, F_DUPFD_CLOEXEC, 3). 610 */ 611static inline int ensure_good_fd(int fd) 612{ 613 int old_fd = fd, saved_errno; 614 615 if (fd < 0) 616 return fd; 617 if (fd < 3) { 618 fd = fcntl(fd, F_DUPFD_CLOEXEC, 3); 619 saved_errno = errno; 620 close(old_fd); 621 errno = saved_errno; 622 if (fd < 0) { 623 pr_warn("failed to dup FD %d to FD > 2: %d\n", old_fd, -saved_errno); 624 errno = saved_errno; 625 } 626 } 627 return fd; 628} 629 630/* The following two functions are exposed to bpftool */ 631int bpf_core_add_cands(struct bpf_core_cand *local_cand, 632 size_t local_essent_len, 633 const struct btf *targ_btf, 634 const char *targ_btf_name, 635 int targ_start_id, 636 struct bpf_core_cand_list *cands); 637void bpf_core_free_cands(struct bpf_core_cand_list *cands); 638 639struct usdt_manager *usdt_manager_new(struct bpf_object *obj); 640void usdt_manager_free(struct usdt_manager *man); 641struct bpf_link * usdt_manager_attach_usdt(struct usdt_manager *man, 642 const struct bpf_program *prog, 643 pid_t pid, const char *path, 644 const char *usdt_provider, const char *usdt_name, 645 __u64 usdt_cookie); 646 647static inline bool is_pow_of_2(size_t x) 648{ 649 return x && (x & (x - 1)) == 0; 650} 651 652#define PROG_LOAD_ATTEMPTS 5 653int sys_bpf_prog_load(union bpf_attr *attr, unsigned int size, int attempts); 654 655bool glob_match(const char *str, const char *pat); 656 657#ifdef HAVE_LIBELF 658long elf_find_func_offset(Elf *elf, const char *binary_path, const char *name); 659#elif HAVE_ELFIO 660long elf_find_func_offset(pelfio_t elf, const char *binary_path, const char *name); 661#endif 662long elf_find_func_offset_from_file(const char *binary_path, const char *name); 663 664struct elf_fd { 665#ifdef HAVE_LIBELF 666 Elf *elf; 667#elif HAVE_ELFIO 668 pelfio_t elf; 669#endif 670 int fd; 671}; 672 673int elf_open(const char *binary_path, struct elf_fd *elf_fd); 674void elf_close(struct elf_fd *elf_fd); 675 676int elf_resolve_syms_offsets(const char *binary_path, int cnt, 677 const char **syms, unsigned long **poffsets); 678int elf_resolve_pattern_offsets(const char *binary_path, const char *pattern, 679 unsigned long **poffsets, size_t *pcnt); 680 681#endif /* __LIBBPF_LIBBPF_INTERNAL_H */ 682