1 /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */ 2 3 /* 4 * Common BPF ELF 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 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU Lesser General Public 12 * License as published by the Free Software Foundation; 13 * version 2.1 of the License (not later!) 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU Lesser General Public License for more details. 19 * 20 * You should have received a copy of the GNU Lesser General Public 21 * License along with this program; if not, see <http://www.gnu.org/licenses> 22 */ 23 #ifndef __LIBBPF_BPF_H 24 #define __LIBBPF_BPF_H 25 26 #include <linux/bpf.h> 27 #include <stdbool.h> 28 #include <stddef.h> 29 #include <stdint.h> 30 31 #include "libbpf_common.h" 32 #include "libbpf_legacy.h" 33 34 #ifdef __cplusplus 35 extern "C" { 36 #endif 37 38 LIBBPF_API int libbpf_set_memlock_rlim(size_t memlock_bytes); 39 40 struct bpf_map_create_opts { 41 size_t sz; /* size of this struct for forward/backward compatibility */ 42 43 __u32 btf_fd; 44 __u32 btf_key_type_id; 45 __u32 btf_value_type_id; 46 __u32 btf_vmlinux_value_type_id; 47 48 __u32 inner_map_fd; 49 __u32 map_flags; 50 __u64 map_extra; 51 52 __u32 numa_node; 53 __u32 map_ifindex; 54 __s32 value_type_btf_obj_fd; 55 56 __u32 token_fd; 57 size_t :0; 58 }; 59 #define bpf_map_create_opts__last_field token_fd 60 61 LIBBPF_API int bpf_map_create(enum bpf_map_type map_type, 62 const char *map_name, 63 __u32 key_size, 64 __u32 value_size, 65 __u32 max_entries, 66 const struct bpf_map_create_opts *opts); 67 68 struct bpf_prog_load_opts { 69 size_t sz; /* size of this struct for forward/backward compatibility */ 70 71 /* libbpf can retry BPF_PROG_LOAD command if bpf() syscall returns 72 * -EAGAIN. This field determines how many attempts libbpf has to 73 * make. If not specified, libbpf will use default value of 5. 74 */ 75 int attempts; 76 77 enum bpf_attach_type expected_attach_type; 78 __u32 prog_btf_fd; 79 __u32 prog_flags; 80 __u32 prog_ifindex; 81 __u32 kern_version; 82 83 __u32 attach_btf_id; 84 __u32 attach_prog_fd; 85 __u32 attach_btf_obj_fd; 86 87 const int *fd_array; 88 89 /* .BTF.ext func info data */ 90 const void *func_info; 91 __u32 func_info_cnt; 92 __u32 func_info_rec_size; 93 94 /* .BTF.ext line info data */ 95 const void *line_info; 96 __u32 line_info_cnt; 97 __u32 line_info_rec_size; 98 99 /* verifier log options */ 100 __u32 log_level; 101 __u32 log_size; 102 char *log_buf; 103 /* output: actual total log contents size (including termintaing zero). 104 * It could be both larger than original log_size (if log was 105 * truncated), or smaller (if log buffer wasn't filled completely). 106 * If kernel doesn't support this feature, log_size is left unchanged. 107 */ 108 __u32 log_true_size; 109 __u32 token_fd; 110 size_t :0; 111 }; 112 #define bpf_prog_load_opts__last_field token_fd 113 114 LIBBPF_API int bpf_prog_load(enum bpf_prog_type prog_type, 115 const char *prog_name, const char *license, 116 const struct bpf_insn *insns, size_t insn_cnt, 117 struct bpf_prog_load_opts *opts); 118 119 /* Flags to direct loading requirements */ 120 #define MAPS_RELAX_COMPAT 0x01 121 122 /* Recommended log buffer size */ 123 #define BPF_LOG_BUF_SIZE (UINT32_MAX >> 8) /* verifier maximum in kernels <= 5.1 */ 124 125 struct bpf_btf_load_opts { 126 size_t sz; /* size of this struct for forward/backward compatibility */ 127 128 /* kernel log options */ 129 char *log_buf; 130 __u32 log_level; 131 __u32 log_size; 132 /* output: actual total log contents size (including termintaing zero). 133 * It could be both larger than original log_size (if log was 134 * truncated), or smaller (if log buffer wasn't filled completely). 135 * If kernel doesn't support this feature, log_size is left unchanged. 136 */ 137 __u32 log_true_size; 138 139 __u32 btf_flags; 140 __u32 token_fd; 141 size_t :0; 142 }; 143 #define bpf_btf_load_opts__last_field token_fd 144 145 LIBBPF_API int bpf_btf_load(const void *btf_data, size_t btf_size, 146 struct bpf_btf_load_opts *opts); 147 148 LIBBPF_API int bpf_map_update_elem(int fd, const void *key, const void *value, 149 __u64 flags); 150 151 LIBBPF_API int bpf_map_lookup_elem(int fd, const void *key, void *value); 152 LIBBPF_API int bpf_map_lookup_elem_flags(int fd, const void *key, void *value, 153 __u64 flags); 154 LIBBPF_API int bpf_map_lookup_and_delete_elem(int fd, const void *key, 155 void *value); 156 LIBBPF_API int bpf_map_lookup_and_delete_elem_flags(int fd, const void *key, 157 void *value, __u64 flags); 158 LIBBPF_API int bpf_map_delete_elem(int fd, const void *key); 159 LIBBPF_API int bpf_map_delete_elem_flags(int fd, const void *key, __u64 flags); 160 LIBBPF_API int bpf_map_get_next_key(int fd, const void *key, void *next_key); 161 LIBBPF_API int bpf_map_freeze(int fd); 162 163 struct bpf_map_batch_opts { 164 size_t sz; /* size of this struct for forward/backward compatibility */ 165 __u64 elem_flags; 166 __u64 flags; 167 }; 168 #define bpf_map_batch_opts__last_field flags 169 170 171 /** 172 * @brief **bpf_map_delete_batch()** allows for batch deletion of multiple 173 * elements in a BPF map. 174 * 175 * @param fd BPF map file descriptor 176 * @param keys pointer to an array of *count* keys 177 * @param count input and output parameter; on input **count** represents the 178 * number of elements in the map to delete in batch; 179 * on output if a non-EFAULT error is returned, **count** represents the number of deleted 180 * elements if the output **count** value is not equal to the input **count** value 181 * If EFAULT is returned, **count** should not be trusted to be correct. 182 * @param opts options for configuring the way the batch deletion works 183 * @return 0, on success; negative error code, otherwise (errno is also set to 184 * the error code) 185 */ 186 LIBBPF_API int bpf_map_delete_batch(int fd, const void *keys, 187 __u32 *count, 188 const struct bpf_map_batch_opts *opts); 189 190 /** 191 * @brief **bpf_map_lookup_batch()** allows for batch lookup of BPF map elements. 192 * 193 * The parameter *in_batch* is the address of the first element in the batch to 194 * read. *out_batch* is an output parameter that should be passed as *in_batch* 195 * to subsequent calls to **bpf_map_lookup_batch()**. NULL can be passed for 196 * *in_batch* to indicate that the batched lookup starts from the beginning of 197 * the map. Both *in_batch* and *out_batch* must point to memory large enough to 198 * hold a single key, except for maps of type **BPF_MAP_TYPE_{HASH, PERCPU_HASH, 199 * LRU_HASH, LRU_PERCPU_HASH}**, for which the memory size must be at 200 * least 4 bytes wide regardless of key size. 201 * 202 * The *keys* and *values* are output parameters which must point to memory large enough to 203 * hold *count* items based on the key and value size of the map *map_fd*. The *keys* 204 * buffer must be of *key_size* * *count*. The *values* buffer must be of 205 * *value_size* * *count*. 206 * 207 * @param fd BPF map file descriptor 208 * @param in_batch address of the first element in batch to read, can pass NULL to 209 * indicate that the batched lookup starts from the beginning of the map. 210 * @param out_batch output parameter that should be passed to next call as *in_batch* 211 * @param keys pointer to an array large enough for *count* keys 212 * @param values pointer to an array large enough for *count* values 213 * @param count input and output parameter; on input it's the number of elements 214 * in the map to read in batch; on output it's the number of elements that were 215 * successfully read. 216 * If a non-EFAULT error is returned, count will be set as the number of elements 217 * that were read before the error occurred. 218 * If EFAULT is returned, **count** should not be trusted to be correct. 219 * @param opts options for configuring the way the batch lookup works 220 * @return 0, on success; negative error code, otherwise (errno is also set to 221 * the error code) 222 */ 223 LIBBPF_API int bpf_map_lookup_batch(int fd, void *in_batch, void *out_batch, 224 void *keys, void *values, __u32 *count, 225 const struct bpf_map_batch_opts *opts); 226 227 /** 228 * @brief **bpf_map_lookup_and_delete_batch()** allows for batch lookup and deletion 229 * of BPF map elements where each element is deleted after being retrieved. 230 * 231 * @param fd BPF map file descriptor 232 * @param in_batch address of the first element in batch to read, can pass NULL to 233 * get address of the first element in *out_batch*. If not NULL, must be large 234 * enough to hold a key. For **BPF_MAP_TYPE_{HASH, PERCPU_HASH, LRU_HASH, 235 * LRU_PERCPU_HASH}**, the memory size must be at least 4 bytes wide regardless 236 * of key size. 237 * @param out_batch output parameter that should be passed to next call as *in_batch* 238 * @param keys pointer to an array of *count* keys 239 * @param values pointer to an array large enough for *count* values 240 * @param count input and output parameter; on input it's the number of elements 241 * in the map to read and delete in batch; on output it represents the number of 242 * elements that were successfully read and deleted 243 * If a non-**EFAULT** error code is returned and if the output **count** value 244 * is not equal to the input **count** value, up to **count** elements may 245 * have been deleted. 246 * if **EFAULT** is returned up to *count* elements may have been deleted without 247 * being returned via the *keys* and *values* output parameters. 248 * @param opts options for configuring the way the batch lookup and delete works 249 * @return 0, on success; negative error code, otherwise (errno is also set to 250 * the error code) 251 */ 252 LIBBPF_API int bpf_map_lookup_and_delete_batch(int fd, void *in_batch, 253 void *out_batch, void *keys, 254 void *values, __u32 *count, 255 const struct bpf_map_batch_opts *opts); 256 257 /** 258 * @brief **bpf_map_update_batch()** updates multiple elements in a map 259 * by specifying keys and their corresponding values. 260 * 261 * The *keys* and *values* parameters must point to memory large enough 262 * to hold *count* items based on the key and value size of the map. 263 * 264 * The *opts* parameter can be used to control how *bpf_map_update_batch()* 265 * should handle keys that either do or do not already exist in the map. 266 * In particular the *flags* parameter of *bpf_map_batch_opts* can be 267 * one of the following: 268 * 269 * Note that *count* is an input and output parameter, where on output it 270 * represents how many elements were successfully updated. Also note that if 271 * **EFAULT** then *count* should not be trusted to be correct. 272 * 273 * **BPF_ANY** 274 * Create new elements or update existing. 275 * 276 * **BPF_NOEXIST** 277 * Create new elements only if they do not exist. 278 * 279 * **BPF_EXIST** 280 * Update existing elements. 281 * 282 * **BPF_F_LOCK** 283 * Update spin_lock-ed map elements. This must be 284 * specified if the map value contains a spinlock. 285 * 286 * @param fd BPF map file descriptor 287 * @param keys pointer to an array of *count* keys 288 * @param values pointer to an array of *count* values 289 * @param count input and output parameter; on input it's the number of elements 290 * in the map to update in batch; on output if a non-EFAULT error is returned, 291 * **count** represents the number of updated elements if the output **count** 292 * value is not equal to the input **count** value. 293 * If EFAULT is returned, **count** should not be trusted to be correct. 294 * @param opts options for configuring the way the batch update works 295 * @return 0, on success; negative error code, otherwise (errno is also set to 296 * the error code) 297 */ 298 LIBBPF_API int bpf_map_update_batch(int fd, const void *keys, const void *values, 299 __u32 *count, 300 const struct bpf_map_batch_opts *opts); 301 302 struct bpf_obj_pin_opts { 303 size_t sz; /* size of this struct for forward/backward compatibility */ 304 305 __u32 file_flags; 306 int path_fd; 307 308 size_t :0; 309 }; 310 #define bpf_obj_pin_opts__last_field path_fd 311 312 LIBBPF_API int bpf_obj_pin(int fd, const char *pathname); 313 LIBBPF_API int bpf_obj_pin_opts(int fd, const char *pathname, 314 const struct bpf_obj_pin_opts *opts); 315 316 struct bpf_obj_get_opts { 317 size_t sz; /* size of this struct for forward/backward compatibility */ 318 319 __u32 file_flags; 320 int path_fd; 321 322 size_t :0; 323 }; 324 #define bpf_obj_get_opts__last_field path_fd 325 326 LIBBPF_API int bpf_obj_get(const char *pathname); 327 LIBBPF_API int bpf_obj_get_opts(const char *pathname, 328 const struct bpf_obj_get_opts *opts); 329 330 LIBBPF_API int bpf_prog_attach(int prog_fd, int attachable_fd, 331 enum bpf_attach_type type, unsigned int flags); 332 LIBBPF_API int bpf_prog_detach(int attachable_fd, enum bpf_attach_type type); 333 LIBBPF_API int bpf_prog_detach2(int prog_fd, int attachable_fd, 334 enum bpf_attach_type type); 335 336 struct bpf_prog_attach_opts { 337 size_t sz; /* size of this struct for forward/backward compatibility */ 338 __u32 flags; 339 union { 340 int replace_prog_fd; 341 int replace_fd; 342 }; 343 int relative_fd; 344 __u32 relative_id; 345 __u64 expected_revision; 346 size_t :0; 347 }; 348 #define bpf_prog_attach_opts__last_field expected_revision 349 350 struct bpf_prog_detach_opts { 351 size_t sz; /* size of this struct for forward/backward compatibility */ 352 __u32 flags; 353 int relative_fd; 354 __u32 relative_id; 355 __u64 expected_revision; 356 size_t :0; 357 }; 358 #define bpf_prog_detach_opts__last_field expected_revision 359 360 /** 361 * @brief **bpf_prog_attach_opts()** attaches the BPF program corresponding to 362 * *prog_fd* to a *target* which can represent a file descriptor or netdevice 363 * ifindex. 364 * 365 * @param prog_fd BPF program file descriptor 366 * @param target attach location file descriptor or ifindex 367 * @param type attach type for the BPF program 368 * @param opts options for configuring the attachment 369 * @return 0, on success; negative error code, otherwise (errno is also set to 370 * the error code) 371 */ 372 LIBBPF_API int bpf_prog_attach_opts(int prog_fd, int target, 373 enum bpf_attach_type type, 374 const struct bpf_prog_attach_opts *opts); 375 376 /** 377 * @brief **bpf_prog_detach_opts()** detaches the BPF program corresponding to 378 * *prog_fd* from a *target* which can represent a file descriptor or netdevice 379 * ifindex. 380 * 381 * @param prog_fd BPF program file descriptor 382 * @param target detach location file descriptor or ifindex 383 * @param type detach type for the BPF program 384 * @param opts options for configuring the detachment 385 * @return 0, on success; negative error code, otherwise (errno is also set to 386 * the error code) 387 */ 388 LIBBPF_API int bpf_prog_detach_opts(int prog_fd, int target, 389 enum bpf_attach_type type, 390 const struct bpf_prog_detach_opts *opts); 391 392 union bpf_iter_link_info; /* defined in up-to-date linux/bpf.h */ 393 struct bpf_link_create_opts { 394 size_t sz; /* size of this struct for forward/backward compatibility */ 395 __u32 flags; 396 union bpf_iter_link_info *iter_info; 397 __u32 iter_info_len; 398 __u32 target_btf_id; 399 union { 400 struct { 401 __u64 bpf_cookie; 402 } perf_event; 403 struct { 404 __u32 flags; 405 __u32 cnt; 406 const char **syms; 407 const unsigned long *addrs; 408 const __u64 *cookies; 409 } kprobe_multi; 410 struct { 411 __u32 flags; 412 __u32 cnt; 413 const char *path; 414 const unsigned long *offsets; 415 const unsigned long *ref_ctr_offsets; 416 const __u64 *cookies; 417 __u32 pid; 418 } uprobe_multi; 419 struct { 420 __u64 cookie; 421 } tracing; 422 struct { 423 __u32 pf; 424 __u32 hooknum; 425 __s32 priority; 426 __u32 flags; 427 } netfilter; 428 struct { 429 __u32 relative_fd; 430 __u32 relative_id; 431 __u64 expected_revision; 432 } tcx; 433 struct { 434 __u32 relative_fd; 435 __u32 relative_id; 436 __u64 expected_revision; 437 } netkit; 438 }; 439 size_t :0; 440 }; 441 #define bpf_link_create_opts__last_field uprobe_multi.pid 442 443 LIBBPF_API int bpf_link_create(int prog_fd, int target_fd, 444 enum bpf_attach_type attach_type, 445 const struct bpf_link_create_opts *opts); 446 447 LIBBPF_API int bpf_link_detach(int link_fd); 448 449 struct bpf_link_update_opts { 450 size_t sz; /* size of this struct for forward/backward compatibility */ 451 __u32 flags; /* extra flags */ 452 __u32 old_prog_fd; /* expected old program FD */ 453 __u32 old_map_fd; /* expected old map FD */ 454 }; 455 #define bpf_link_update_opts__last_field old_map_fd 456 457 LIBBPF_API int bpf_link_update(int link_fd, int new_prog_fd, 458 const struct bpf_link_update_opts *opts); 459 460 LIBBPF_API int bpf_iter_create(int link_fd); 461 462 struct bpf_prog_test_run_attr { 463 int prog_fd; 464 int repeat; 465 const void *data_in; 466 __u32 data_size_in; 467 void *data_out; /* optional */ 468 __u32 data_size_out; /* in: max length of data_out 469 * out: length of data_out */ 470 __u32 retval; /* out: return code of the BPF program */ 471 __u32 duration; /* out: average per repetition in ns */ 472 const void *ctx_in; /* optional */ 473 __u32 ctx_size_in; 474 void *ctx_out; /* optional */ 475 __u32 ctx_size_out; /* in: max length of ctx_out 476 * out: length of cxt_out */ 477 }; 478 479 LIBBPF_API int bpf_prog_get_next_id(__u32 start_id, __u32 *next_id); 480 LIBBPF_API int bpf_map_get_next_id(__u32 start_id, __u32 *next_id); 481 LIBBPF_API int bpf_btf_get_next_id(__u32 start_id, __u32 *next_id); 482 LIBBPF_API int bpf_link_get_next_id(__u32 start_id, __u32 *next_id); 483 484 struct bpf_get_fd_by_id_opts { 485 size_t sz; /* size of this struct for forward/backward compatibility */ 486 __u32 open_flags; /* permissions requested for the operation on fd */ 487 size_t :0; 488 }; 489 #define bpf_get_fd_by_id_opts__last_field open_flags 490 491 LIBBPF_API int bpf_prog_get_fd_by_id(__u32 id); 492 LIBBPF_API int bpf_prog_get_fd_by_id_opts(__u32 id, 493 const struct bpf_get_fd_by_id_opts *opts); 494 LIBBPF_API int bpf_map_get_fd_by_id(__u32 id); 495 LIBBPF_API int bpf_map_get_fd_by_id_opts(__u32 id, 496 const struct bpf_get_fd_by_id_opts *opts); 497 LIBBPF_API int bpf_btf_get_fd_by_id(__u32 id); 498 LIBBPF_API int bpf_btf_get_fd_by_id_opts(__u32 id, 499 const struct bpf_get_fd_by_id_opts *opts); 500 LIBBPF_API int bpf_link_get_fd_by_id(__u32 id); 501 LIBBPF_API int bpf_link_get_fd_by_id_opts(__u32 id, 502 const struct bpf_get_fd_by_id_opts *opts); 503 LIBBPF_API int bpf_obj_get_info_by_fd(int bpf_fd, void *info, __u32 *info_len); 504 505 /** 506 * @brief **bpf_prog_get_info_by_fd()** obtains information about the BPF 507 * program corresponding to *prog_fd*. 508 * 509 * Populates up to *info_len* bytes of *info* and updates *info_len* with the 510 * actual number of bytes written to *info*. Note that *info* should be 511 * zero-initialized or initialized as expected by the requested *info* 512 * type. Failing to (zero-)initialize *info* under certain circumstances can 513 * result in this helper returning an error. 514 * 515 * @param prog_fd BPF program file descriptor 516 * @param info pointer to **struct bpf_prog_info** that will be populated with 517 * BPF program information 518 * @param info_len pointer to the size of *info*; on success updated with the 519 * number of bytes written to *info* 520 * @return 0, on success; negative error code, otherwise (errno is also set to 521 * the error code) 522 */ 523 LIBBPF_API int bpf_prog_get_info_by_fd(int prog_fd, struct bpf_prog_info *info, __u32 *info_len); 524 525 /** 526 * @brief **bpf_map_get_info_by_fd()** obtains information about the BPF 527 * map corresponding to *map_fd*. 528 * 529 * Populates up to *info_len* bytes of *info* and updates *info_len* with the 530 * actual number of bytes written to *info*. Note that *info* should be 531 * zero-initialized or initialized as expected by the requested *info* 532 * type. Failing to (zero-)initialize *info* under certain circumstances can 533 * result in this helper returning an error. 534 * 535 * @param map_fd BPF map file descriptor 536 * @param info pointer to **struct bpf_map_info** that will be populated with 537 * BPF map information 538 * @param info_len pointer to the size of *info*; on success updated with the 539 * number of bytes written to *info* 540 * @return 0, on success; negative error code, otherwise (errno is also set to 541 * the error code) 542 */ 543 LIBBPF_API int bpf_map_get_info_by_fd(int map_fd, struct bpf_map_info *info, __u32 *info_len); 544 545 /** 546 * @brief **bpf_btf_get_info_by_fd()** obtains information about the 547 * BTF object corresponding to *btf_fd*. 548 * 549 * Populates up to *info_len* bytes of *info* and updates *info_len* with the 550 * actual number of bytes written to *info*. Note that *info* should be 551 * zero-initialized or initialized as expected by the requested *info* 552 * type. Failing to (zero-)initialize *info* under certain circumstances can 553 * result in this helper returning an error. 554 * 555 * @param btf_fd BTF object file descriptor 556 * @param info pointer to **struct bpf_btf_info** that will be populated with 557 * BTF object information 558 * @param info_len pointer to the size of *info*; on success updated with the 559 * number of bytes written to *info* 560 * @return 0, on success; negative error code, otherwise (errno is also set to 561 * the error code) 562 */ 563 LIBBPF_API int bpf_btf_get_info_by_fd(int btf_fd, struct bpf_btf_info *info, __u32 *info_len); 564 565 /** 566 * @brief **bpf_btf_get_info_by_fd()** obtains information about the BPF 567 * link corresponding to *link_fd*. 568 * 569 * Populates up to *info_len* bytes of *info* and updates *info_len* with the 570 * actual number of bytes written to *info*. Note that *info* should be 571 * zero-initialized or initialized as expected by the requested *info* 572 * type. Failing to (zero-)initialize *info* under certain circumstances can 573 * result in this helper returning an error. 574 * 575 * @param link_fd BPF link file descriptor 576 * @param info pointer to **struct bpf_link_info** that will be populated with 577 * BPF link information 578 * @param info_len pointer to the size of *info*; on success updated with the 579 * number of bytes written to *info* 580 * @return 0, on success; negative error code, otherwise (errno is also set to 581 * the error code) 582 */ 583 LIBBPF_API int bpf_link_get_info_by_fd(int link_fd, struct bpf_link_info *info, __u32 *info_len); 584 585 struct bpf_prog_query_opts { 586 size_t sz; /* size of this struct for forward/backward compatibility */ 587 __u32 query_flags; 588 __u32 attach_flags; /* output argument */ 589 __u32 *prog_ids; 590 union { 591 /* input+output argument */ 592 __u32 prog_cnt; 593 __u32 count; 594 }; 595 __u32 *prog_attach_flags; 596 __u32 *link_ids; 597 __u32 *link_attach_flags; 598 __u64 revision; 599 size_t :0; 600 }; 601 #define bpf_prog_query_opts__last_field revision 602 603 /** 604 * @brief **bpf_prog_query_opts()** queries the BPF programs and BPF links 605 * which are attached to *target* which can represent a file descriptor or 606 * netdevice ifindex. 607 * 608 * @param target query location file descriptor or ifindex 609 * @param type attach type for the BPF program 610 * @param opts options for configuring the query 611 * @return 0, on success; negative error code, otherwise (errno is also set to 612 * the error code) 613 */ 614 LIBBPF_API int bpf_prog_query_opts(int target, enum bpf_attach_type type, 615 struct bpf_prog_query_opts *opts); 616 LIBBPF_API int bpf_prog_query(int target_fd, enum bpf_attach_type type, 617 __u32 query_flags, __u32 *attach_flags, 618 __u32 *prog_ids, __u32 *prog_cnt); 619 620 struct bpf_raw_tp_opts { 621 size_t sz; /* size of this struct for forward/backward compatibility */ 622 const char *tp_name; 623 __u64 cookie; 624 size_t :0; 625 }; 626 #define bpf_raw_tp_opts__last_field cookie 627 628 LIBBPF_API int bpf_raw_tracepoint_open_opts(int prog_fd, struct bpf_raw_tp_opts *opts); 629 LIBBPF_API int bpf_raw_tracepoint_open(const char *name, int prog_fd); 630 LIBBPF_API int bpf_task_fd_query(int pid, int fd, __u32 flags, char *buf, 631 __u32 *buf_len, __u32 *prog_id, __u32 *fd_type, 632 __u64 *probe_offset, __u64 *probe_addr); 633 634 #ifdef __cplusplus 635 /* forward-declaring enums in C++ isn't compatible with pure C enums, so 636 * instead define bpf_enable_stats() as accepting int as an input 637 */ 638 LIBBPF_API int bpf_enable_stats(int type); 639 #else 640 enum bpf_stats_type; /* defined in up-to-date linux/bpf.h */ 641 LIBBPF_API int bpf_enable_stats(enum bpf_stats_type type); 642 #endif 643 644 struct bpf_prog_bind_opts { 645 size_t sz; /* size of this struct for forward/backward compatibility */ 646 __u32 flags; 647 }; 648 #define bpf_prog_bind_opts__last_field flags 649 650 LIBBPF_API int bpf_prog_bind_map(int prog_fd, int map_fd, 651 const struct bpf_prog_bind_opts *opts); 652 653 struct bpf_test_run_opts { 654 size_t sz; /* size of this struct for forward/backward compatibility */ 655 const void *data_in; /* optional */ 656 void *data_out; /* optional */ 657 __u32 data_size_in; 658 __u32 data_size_out; /* in: max length of data_out 659 * out: length of data_out 660 */ 661 const void *ctx_in; /* optional */ 662 void *ctx_out; /* optional */ 663 __u32 ctx_size_in; 664 __u32 ctx_size_out; /* in: max length of ctx_out 665 * out: length of cxt_out 666 */ 667 __u32 retval; /* out: return code of the BPF program */ 668 int repeat; 669 __u32 duration; /* out: average per repetition in ns */ 670 __u32 flags; 671 __u32 cpu; 672 __u32 batch_size; 673 }; 674 #define bpf_test_run_opts__last_field batch_size 675 676 LIBBPF_API int bpf_prog_test_run_opts(int prog_fd, 677 struct bpf_test_run_opts *opts); 678 679 struct bpf_token_create_opts { 680 size_t sz; /* size of this struct for forward/backward compatibility */ 681 __u32 flags; 682 size_t :0; 683 }; 684 #define bpf_token_create_opts__last_field flags 685 686 /** 687 * @brief **bpf_token_create()** creates a new instance of BPF token derived 688 * from specified BPF FS mount point. 689 * 690 * BPF token created with this API can be passed to bpf() syscall for 691 * commands like BPF_PROG_LOAD, BPF_MAP_CREATE, etc. 692 * 693 * @param bpffs_fd FD for BPF FS instance from which to derive a BPF token 694 * instance. 695 * @param opts optional BPF token creation options, can be NULL 696 * 697 * @return BPF token FD > 0, on success; negative error code, otherwise (errno 698 * is also set to the error code) 699 */ 700 LIBBPF_API int bpf_token_create(int bpffs_fd, 701 struct bpf_token_create_opts *opts); 702 703 #ifdef __cplusplus 704 } /* extern "C" */ 705 #endif 706 707 #endif /* __LIBBPF_BPF_H */ 708