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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 "libbpf_legacy.h"
17#include "relo_core.h"
18
19
20#pragma GCC poison u8 u16 u32 u64 s8 s16 s32 s64
21
22
23#pragma GCC poison reallocarray
24
25#include "libbpf.h"
26#include "btf.h"
27
28#ifndef EM_BPF
29#define EM_BPF 247
30#endif
31
32#ifndef R_BPF_64_64
33#define R_BPF_64_64 1
34#endif
35#ifndef R_BPF_64_ABS64
36#define R_BPF_64_ABS64 2
37#endif
38#ifndef R_BPF_64_ABS32
39#define R_BPF_64_ABS32 3
40#endif
41#ifndef R_BPF_64_32
42#define R_BPF_64_32 10
43#endif
44
45#ifndef SHT_LLVM_ADDRSIG
46#define SHT_LLVM_ADDRSIG 0x6FFF4C03
47#endif
48
49
50#ifndef ELF_C_READ_MMAP
51#define ELF_C_READ_MMAP ELF_C_READ
52#endif
53
54
55#ifndef GELF_ST_VISIBILITY
56#define GELF_ST_VISIBILITY(o) ((o) & 0x03)
57#endif
58
59#define BTF_INFO_ENC(kind, kind_flag, vlen) \
60 ((!!(kind_flag) << 31) | ((kind) << 24) | ((vlen) & BTF_MAX_VLEN))
61#define BTF_TYPE_ENC(name, info, size_or_type) (name), (info), (size_or_type)
62#define BTF_INT_ENC(encoding, bits_offset, nr_bits) \
63 ((encoding) << 24 | (bits_offset) << 16 | (nr_bits))
64#define BTF_TYPE_INT_ENC(name, encoding, bits_offset, bits, sz) \
65 BTF_TYPE_ENC(name, BTF_INFO_ENC(BTF_KIND_INT, 0, 0), sz), \
66 BTF_INT_ENC(encoding, bits_offset, bits)
67#define BTF_MEMBER_ENC(name, type, bits_offset) (name), (type), (bits_offset)
68#define BTF_PARAM_ENC(name, type) (name), (type)
69#define BTF_VAR_SECINFO_ENC(type, offset, size) (type), (offset), (size)
70#define BTF_TYPE_FLOAT_ENC(name, sz) \
71 BTF_TYPE_ENC(name, BTF_INFO_ENC(BTF_KIND_FLOAT, 0, 0), sz)
72
73#ifndef likely
74#define likely(x) __builtin_expect(!!(x), 1)
75#endif
76#ifndef unlikely
77#define unlikely(x) __builtin_expect(!!(x), 0)
78#endif
79#ifndef min
80# define min(x, y) ((x) < (y) ? (x) : (y))
81#endif
82#ifndef max
83# define max(x, y) ((x) < (y) ? (y) : (x))
84#endif
85#ifndef offsetofend
86# define offsetofend(TYPE, FIELD) \
87 (offsetof(TYPE, FIELD) + sizeof(((TYPE *)0)->FIELD))
88#endif
89
90
91
92
93
94#ifdef SHARED
95# define COMPAT_VERSION(internal_name, api_name, version) \
96 asm(".symver " #internal_name "," #api_name "@" #version);
97# define DEFAULT_VERSION(internal_name, api_name, version) \
98 asm(".symver " #internal_name "," #api_name "@@" #version);
99#else
100# define COMPAT_VERSION(internal_name, api_name, version)
101# define DEFAULT_VERSION(internal_name, api_name, version) \
102 extern typeof(internal_name) api_name \
103 __attribute__((alias(#internal_name)));
104#endif
105
106extern void libbpf_print(enum libbpf_print_level level,
107 const char *format, ...)
108 __attribute__((format(printf, 2, 3)));
109
110#define __pr(level, fmt, ...) \
111do { \
112 libbpf_print(level, "libbpf: " fmt, ##__VA_ARGS__); \
113} while (0)
114
115#define pr_warn(fmt, ...) __pr(LIBBPF_WARN, fmt, ##__VA_ARGS__)
116#define pr_info(fmt, ...) __pr(LIBBPF_INFO, fmt, ##__VA_ARGS__)
117#define pr_debug(fmt, ...) __pr(LIBBPF_DEBUG, fmt, ##__VA_ARGS__)
118
119#ifndef __has_builtin
120#define __has_builtin(x) 0
121#endif
122
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130
131static inline void *libbpf_reallocarray(void *ptr, size_t nmemb, size_t size)
132{
133 size_t total;
134
135#if __has_builtin(__builtin_mul_overflow)
136 if (unlikely(__builtin_mul_overflow(nmemb, size, &total)))
137 return NULL;
138#else
139 if (size == 0 || nmemb > ULONG_MAX / size)
140 return NULL;
141 total = nmemb * size;
142#endif
143 return realloc(ptr, total);
144}
145
146struct btf;
147struct btf_type;
148
149struct btf_type *btf_type_by_id(struct btf *btf, __u32 type_id);
150const char *btf_kind_str(const struct btf_type *t);
151const struct btf_type *skip_mods_and_typedefs(const struct btf *btf, __u32 id, __u32 *res_id);
152
153static inline enum btf_func_linkage btf_func_linkage(const struct btf_type *t)
154{
155 return (enum btf_func_linkage)(int)btf_vlen(t);
156}
157
158static inline __u32 btf_type_info(int kind, int vlen, int kflag)
159{
160 return (kflag << 31) | (kind << 24) | vlen;
161}
162
163enum map_def_parts {
164 MAP_DEF_MAP_TYPE = 0x001,
165 MAP_DEF_KEY_TYPE = 0x002,
166 MAP_DEF_KEY_SIZE = 0x004,
167 MAP_DEF_VALUE_TYPE = 0x008,
168 MAP_DEF_VALUE_SIZE = 0x010,
169 MAP_DEF_MAX_ENTRIES = 0x020,
170 MAP_DEF_MAP_FLAGS = 0x040,
171 MAP_DEF_NUMA_NODE = 0x080,
172 MAP_DEF_PINNING = 0x100,
173 MAP_DEF_INNER_MAP = 0x200,
174
175 MAP_DEF_ALL = 0x3ff,
176};
177
178struct btf_map_def {
179 enum map_def_parts parts;
180 __u32 map_type;
181 __u32 key_type_id;
182 __u32 key_size;
183 __u32 value_type_id;
184 __u32 value_size;
185 __u32 max_entries;
186 __u32 map_flags;
187 __u32 numa_node;
188 __u32 pinning;
189};
190
191int parse_btf_map_def(const char *map_name, struct btf *btf,
192 const struct btf_type *def_t, bool strict,
193 struct btf_map_def *map_def, struct btf_map_def *inner_def);
194
195void *libbpf_add_mem(void **data, size_t *cap_cnt, size_t elem_sz,
196 size_t cur_cnt, size_t max_cnt, size_t add_cnt);
197int libbpf_ensure_mem(void **data, size_t *cap_cnt, size_t elem_sz, size_t need_cnt);
198
199static inline bool libbpf_is_mem_zeroed(const char *p, ssize_t len)
200{
201 while (len > 0) {
202 if (*p)
203 return false;
204 p++;
205 len--;
206 }
207 return true;
208}
209
210static inline bool libbpf_validate_opts(const char *opts,
211 size_t opts_sz, size_t user_sz,
212 const char *type_name)
213{
214 if (user_sz < sizeof(size_t)) {
215 pr_warn("%s size (%zu) is too small\n", type_name, user_sz);
216 return false;
217 }
218 if (!libbpf_is_mem_zeroed(opts + opts_sz, (ssize_t)user_sz - opts_sz)) {
219 pr_warn("%s has non-zero extra bytes\n", type_name);
220 return false;
221 }
222 return true;
223}
224
225#define OPTS_VALID(opts, type) \
226 (!(opts) || libbpf_validate_opts((const char *)opts, \
227 offsetofend(struct type, \
228 type##__last_field), \
229 (opts)->sz, #type))
230#define OPTS_HAS(opts, field) \
231 ((opts) && opts->sz >= offsetofend(typeof(*(opts)), field))
232#define OPTS_GET(opts, field, fallback_value) \
233 (OPTS_HAS(opts, field) ? (opts)->field : fallback_value)
234#define OPTS_SET(opts, field, value) \
235 do { \
236 if (OPTS_HAS(opts, field)) \
237 (opts)->field = value; \
238 } while (0)
239
240#define OPTS_ZEROED(opts, last_nonzero_field) \
241({ \
242 ssize_t __off = offsetofend(typeof(*(opts)), last_nonzero_field); \
243 !(opts) || libbpf_is_mem_zeroed((const void *)opts + __off, \
244 (opts)->sz - __off); \
245})
246
247
248int parse_cpu_mask_str(const char *s, bool **mask, int *mask_sz);
249int parse_cpu_mask_file(const char *fcpu, bool **mask, int *mask_sz);
250int libbpf__load_raw_btf(const char *raw_types, size_t types_len,
251 const char *str_sec, size_t str_len);
252
253struct bpf_prog_load_params {
254 enum bpf_prog_type prog_type;
255 enum bpf_attach_type expected_attach_type;
256 const char *name;
257 const struct bpf_insn *insns;
258 size_t insn_cnt;
259 const char *license;
260 __u32 kern_version;
261 __u32 attach_prog_fd;
262 __u32 attach_btf_obj_fd;
263 __u32 attach_btf_id;
264 __u32 prog_ifindex;
265 __u32 prog_btf_fd;
266 __u32 prog_flags;
267
268 __u32 func_info_rec_size;
269 const void *func_info;
270 __u32 func_info_cnt;
271
272 __u32 line_info_rec_size;
273 const void *line_info;
274 __u32 line_info_cnt;
275
276 __u32 log_level;
277 char *log_buf;
278 size_t log_buf_sz;
279};
280
281int libbpf__bpf_prog_load(const struct bpf_prog_load_params *load_attr);
282
283int bpf_object__section_size(const struct bpf_object *obj, const char *name,
284 __u32 *size);
285int bpf_object__variable_offset(const struct bpf_object *obj, const char *name,
286 __u32 *off);
287struct btf *btf_get_from_fd(int btf_fd, struct btf *base_btf);
288void btf_get_kernel_prefix_kind(enum bpf_attach_type attach_type,
289 const char **prefix, int *kind);
290
291struct btf_ext_info {
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296 void *info;
297 __u32 rec_size;
298 __u32 len;
299};
300
301#define for_each_btf_ext_sec(seg, sec) \
302 for (sec = (seg)->info; \
303 (void *)sec < (seg)->info + (seg)->len; \
304 sec = (void *)sec + sizeof(struct btf_ext_info_sec) + \
305 (seg)->rec_size * sec->num_info)
306
307#define for_each_btf_ext_rec(seg, sec, i, rec) \
308 for (i = 0, rec = (void *)&(sec)->data; \
309 i < (sec)->num_info; \
310 i++, rec = (void *)rec + (seg)->rec_size)
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333struct btf_ext_header {
334 __u16 magic;
335 __u8 version;
336 __u8 flags;
337 __u32 hdr_len;
338
339
340 __u32 func_info_off;
341 __u32 func_info_len;
342 __u32 line_info_off;
343 __u32 line_info_len;
344
345
346 __u32 core_relo_off;
347 __u32 core_relo_len;
348};
349
350struct btf_ext {
351 union {
352 struct btf_ext_header *hdr;
353 void *data;
354 };
355 struct btf_ext_info func_info;
356 struct btf_ext_info line_info;
357 struct btf_ext_info core_relo_info;
358 __u32 data_size;
359};
360
361struct btf_ext_info_sec {
362 __u32 sec_name_off;
363 __u32 num_info;
364
365 __u8 data[];
366};
367
368
369struct bpf_func_info_min {
370 __u32 insn_off;
371 __u32 type_id;
372};
373
374
375struct bpf_line_info_min {
376 __u32 insn_off;
377 __u32 file_name_off;
378 __u32 line_off;
379 __u32 line_col;
380};
381
382
383typedef int (*type_id_visit_fn)(__u32 *type_id, void *ctx);
384typedef int (*str_off_visit_fn)(__u32 *str_off, void *ctx);
385int btf_type_visit_type_ids(struct btf_type *t, type_id_visit_fn visit, void *ctx);
386int btf_type_visit_str_offs(struct btf_type *t, str_off_visit_fn visit, void *ctx);
387int btf_ext_visit_type_ids(struct btf_ext *btf_ext, type_id_visit_fn visit, void *ctx);
388int btf_ext_visit_str_offs(struct btf_ext *btf_ext, str_off_visit_fn visit, void *ctx);
389
390extern enum libbpf_strict_mode libbpf_mode;
391
392
393static inline int libbpf_err(int ret)
394{
395 if (ret < 0)
396 errno = -ret;
397 return ret;
398}
399
400
401
402
403static inline int libbpf_err_errno(int ret)
404{
405 if (libbpf_mode & LIBBPF_STRICT_DIRECT_ERRS)
406
407 return ret < 0 ? -errno : ret;
408
409
410 return ret;
411}
412
413
414static inline void *libbpf_err_ptr(int err)
415{
416
417 errno = -err;
418
419 if (libbpf_mode & LIBBPF_STRICT_CLEAN_PTRS)
420 return NULL;
421
422
423 return ERR_PTR(err);
424}
425
426
427static inline void *libbpf_ptr(void *ret)
428{
429
430 if (IS_ERR(ret))
431 errno = -PTR_ERR(ret);
432
433 if (libbpf_mode & LIBBPF_STRICT_CLEAN_PTRS)
434 return IS_ERR(ret) ? NULL : ret;
435
436
437 return ret;
438}
439
440static inline bool str_is_empty(const char *s)
441{
442 return !s || !s[0];
443}
444
445static inline bool is_ldimm64_insn(struct bpf_insn *insn)
446{
447 return insn->code == (BPF_LD | BPF_IMM | BPF_DW);
448}
449
450#endif
451