tools/lib/bpf/bpf.c

   1 // SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
   2
   3 /*
   4  * common eBPF 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
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <memory.h>
  27 #include <unistd.h>
  28 #include <asm/unistd.h>
  29 #include <errno.h>
  30 #include <linux/bpf.h>
  31 #include "bpf.h"
  32 #include "libbpf.h"
  33 #include "libbpf_internal.h"
  34
  35 /*
  36  * When building perf, unistd.h is overridden. __NR_bpf is
  37  * required to be defined explicitly.
  38  */
  39 #ifndef __NR_bpf
  40 # if defined(__i386__)
  41 #  define __NR_bpf 357
  42 # elif defined(__x86_64__)
  43 #  define __NR_bpf 321
  44 # elif defined(__aarch64__)
  45 #  define __NR_bpf 280
  46 # elif defined(__sparc__)
  47 #  define __NR_bpf 349
  48 # elif defined(__s390__)
  49 #  define __NR_bpf 351
  50 # elif defined(__arc__)
  51 #  define __NR_bpf 280
  52 # else
  53 #  error __NR_bpf not defined. libbpf does not support your arch.
  54 # endif
  55 #endif
  56
  57 static inline __u64 ptr_to_u64(const void *ptr)
  58 {
  59         return (__u64) (unsigned long) ptr;
  60 }
  61
  62 static inline int sys_bpf(enum bpf_cmd cmd, union bpf_attr *attr,
  63                           unsigned int size)
  64 {
  65         return syscall(__NR_bpf, cmd, attr, size);
  66 }
  67
  68 static inline int sys_bpf_prog_load(union bpf_attr *attr, unsigned int size)
  69 {
  70         int retries = 5;
  71         int fd;
  72
  73         do {
  74                 fd = sys_bpf(BPF_PROG_LOAD, attr, size);
  75         } while (fd < 0 && errno == EAGAIN && retries-- > 0);
  76
  77         return fd;
  78 }
  79
  80 int bpf_create_map_xattr(const struct bpf_create_map_attr *create_attr)
  81 {
  82         union bpf_attr attr;
  83
  84         memset(&attr, '\0', sizeof(attr));
  85
  86         attr.map_type = create_attr->map_type;
  87         attr.key_size = create_attr->key_size;
  88         attr.value_size = create_attr->value_size;
  89         attr.max_entries = create_attr->max_entries;
  90         attr.map_flags = create_attr->map_flags;
  91         if (create_attr->name)
  92                 memcpy(attr.map_name, create_attr->name,
  93                        min(strlen(create_attr->name), BPF_OBJ_NAME_LEN - 1));
  94         attr.numa_node = create_attr->numa_node;
  95         attr.btf_fd = create_attr->btf_fd;
  96         attr.btf_key_type_id = create_attr->btf_key_type_id;
  97         attr.btf_value_type_id = create_attr->btf_value_type_id;
  98         attr.map_ifindex = create_attr->map_ifindex;
  99         if (attr.map_type == BPF_MAP_TYPE_STRUCT_OPS)
 100                 attr.btf_vmlinux_value_type_id =
 101                         create_attr->btf_vmlinux_value_type_id;
 102         else
 103                 attr.inner_map_fd = create_attr->inner_map_fd;
 104
 105         return sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr));
 106 }
 107
 108 int bpf_create_map_node(enum bpf_map_type map_type, const char *name,
 109                         int key_size, int value_size, int max_entries,
 110                         __u32 map_flags, int node)
 111 {
 112         struct bpf_create_map_attr map_attr = {};
 113
 114         map_attr.name = name;
 115         map_attr.map_type = map_type;
 116         map_attr.map_flags = map_flags;
 117         map_attr.key_size = key_size;
 118         map_attr.value_size = value_size;
 119         map_attr.max_entries = max_entries;
 120         if (node >= 0) {
 121                 map_attr.numa_node = node;
 122                 map_attr.map_flags |= BPF_F_NUMA_NODE;
 123         }
 124
 125         return bpf_create_map_xattr(&map_attr);
 126 }
 127
 128 int bpf_create_map(enum bpf_map_type map_type, int key_size,
 129                    int value_size, int max_entries, __u32 map_flags)
 130 {
 131         struct bpf_create_map_attr map_attr = {};
 132
 133         map_attr.map_type = map_type;
 134         map_attr.map_flags = map_flags;
 135         map_attr.key_size = key_size;
 136         map_attr.value_size = value_size;
 137         map_attr.max_entries = max_entries;
 138
 139         return bpf_create_map_xattr(&map_attr);
 140 }
 141
 142 int bpf_create_map_name(enum bpf_map_type map_type, const char *name,
 143                         int key_size, int value_size, int max_entries,
 144                         __u32 map_flags)
 145 {
 146         struct bpf_create_map_attr map_attr = {};
 147
 148         map_attr.name = name;
 149         map_attr.map_type = map_type;
 150         map_attr.map_flags = map_flags;
 151         map_attr.key_size = key_size;
 152         map_attr.value_size = value_size;
 153         map_attr.max_entries = max_entries;
 154
 155         return bpf_create_map_xattr(&map_attr);
 156 }
 157
 158 int bpf_create_map_in_map_node(enum bpf_map_type map_type, const char *name,
 159                                int key_size, int inner_map_fd, int max_entries,
 160                                __u32 map_flags, int node)
 161 {
 162         union bpf_attr attr;
 163
 164         memset(&attr, '\0', sizeof(attr));
 165
 166         attr.map_type = map_type;
 167         attr.key_size = key_size;
 168         attr.value_size = 4;
 169         attr.inner_map_fd = inner_map_fd;
 170         attr.max_entries = max_entries;
 171         attr.map_flags = map_flags;
 172         if (name)
 173                 memcpy(attr.map_name, name,
 174                        min(strlen(name), BPF_OBJ_NAME_LEN - 1));
 175
 176         if (node >= 0) {
 177                 attr.map_flags |= BPF_F_NUMA_NODE;
 178                 attr.numa_node = node;
 179         }
 180
 181         return sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr));
 182 }
 183
 184 int bpf_create_map_in_map(enum bpf_map_type map_type, const char *name,
 185                           int key_size, int inner_map_fd, int max_entries,
 186                           __u32 map_flags)
 187 {
 188         return bpf_create_map_in_map_node(map_type, name, key_size,
 189                                           inner_map_fd, max_entries, map_flags,
 190                                           -1);
 191 }
 192
 193 static void *
 194 alloc_zero_tailing_info(const void *orecord, __u32 cnt,
 195                         __u32 actual_rec_size, __u32 expected_rec_size)
 196 {
 197         __u64 info_len = (__u64)actual_rec_size * cnt;
 198         void *info, *nrecord;
 199         int i;
 200
 201         info = malloc(info_len);
 202         if (!info)
 203                 return NULL;
 204
 205         /* zero out bytes kernel does not understand */
 206         nrecord = info;
 207         for (i = 0; i < cnt; i++) {
 208                 memcpy(nrecord, orecord, expected_rec_size);
 209                 memset(nrecord + expected_rec_size, 0,
 210                        actual_rec_size - expected_rec_size);
 211                 orecord += actual_rec_size;
 212                 nrecord += actual_rec_size;
 213         }
 214
 215         return info;
 216 }
 217
 218 int libbpf__bpf_prog_load(const struct bpf_prog_load_params *load_attr)
 219 {
 220         void *finfo = NULL, *linfo = NULL;
 221         union bpf_attr attr;
 222         int fd;
 223
 224         if (!load_attr->log_buf != !load_attr->log_buf_sz)
 225                 return -EINVAL;
 226
 227         if (load_attr->log_level > (4 | 2 | 1) || (load_attr->log_level && !load_attr->log_buf))
 228                 return -EINVAL;
 229
 230         memset(&attr, 0, sizeof(attr));
 231         attr.prog_type = load_attr->prog_type;
 232         attr.expected_attach_type = load_attr->expected_attach_type;
 233
 234         if (load_attr->attach_prog_fd)
 235                 attr.attach_prog_fd = load_attr->attach_prog_fd;
 236         else
 237                 attr.attach_btf_obj_fd = load_attr->attach_btf_obj_fd;
 238         attr.attach_btf_id = load_attr->attach_btf_id;
 239
 240         attr.prog_ifindex = load_attr->prog_ifindex;
 241         attr.kern_version = load_attr->kern_version;
 242
 243         attr.insn_cnt = (__u32)load_attr->insn_cnt;
 244         attr.insns = ptr_to_u64(load_attr->insns);
 245         attr.license = ptr_to_u64(load_attr->license);
 246
 247         attr.log_level = load_attr->log_level;
 248         if (attr.log_level) {
 249                 attr.log_buf = ptr_to_u64(load_attr->log_buf);
 250                 attr.log_size = load_attr->log_buf_sz;
 251         }
 252
 253         attr.prog_btf_fd = load_attr->prog_btf_fd;
 254         attr.prog_flags = load_attr->prog_flags;
 255
 256         attr.func_info_rec_size = load_attr->func_info_rec_size;
 257         attr.func_info_cnt = load_attr->func_info_cnt;
 258         attr.func_info = ptr_to_u64(load_attr->func_info);
 259
 260         attr.line_info_rec_size = load_attr->line_info_rec_size;
 261         attr.line_info_cnt = load_attr->line_info_cnt;
 262         attr.line_info = ptr_to_u64(load_attr->line_info);
 263
 264         if (load_attr->name)
 265                 memcpy(attr.prog_name, load_attr->name,
 266                        min(strlen(load_attr->name), (size_t)BPF_OBJ_NAME_LEN - 1));
 267
 268         fd = sys_bpf_prog_load(&attr, sizeof(attr));
 269         if (fd >= 0)
 270                 return fd;
 271
 272         /* After bpf_prog_load, the kernel may modify certain attributes
 273          * to give user space a hint how to deal with loading failure.
 274          * Check to see whether we can make some changes and load again.
 275          */
 276         while (errno == E2BIG && (!finfo || !linfo)) {
 277                 if (!finfo && attr.func_info_cnt &&
 278                     attr.func_info_rec_size < load_attr->func_info_rec_size) {
 279                         /* try with corrected func info records */
 280                         finfo = alloc_zero_tailing_info(load_attr->func_info,
 281                                                         load_attr->func_info_cnt,
 282                                                         load_attr->func_info_rec_size,
 283                                                         attr.func_info_rec_size);
 284                         if (!finfo)
 285                                 goto done;
 286
 287                         attr.func_info = ptr_to_u64(finfo);
 288                         attr.func_info_rec_size = load_attr->func_info_rec_size;
 289                 } else if (!linfo && attr.line_info_cnt &&
 290                            attr.line_info_rec_size <
 291                            load_attr->line_info_rec_size) {
 292                         linfo = alloc_zero_tailing_info(load_attr->line_info,
 293                                                         load_attr->line_info_cnt,
 294                                                         load_attr->line_info_rec_size,
 295                                                         attr.line_info_rec_size);
 296                         if (!linfo)
 297                                 goto done;
 298
 299                         attr.line_info = ptr_to_u64(linfo);
 300                         attr.line_info_rec_size = load_attr->line_info_rec_size;
 301                 } else {
 302                         break;
 303                 }
 304
 305                 fd = sys_bpf_prog_load(&attr, sizeof(attr));
 306                 if (fd >= 0)
 307                         goto done;
 308         }
 309
 310         if (load_attr->log_level || !load_attr->log_buf)
 311                 goto done;
 312
 313         /* Try again with log */
 314         attr.log_buf = ptr_to_u64(load_attr->log_buf);
 315         attr.log_size = load_attr->log_buf_sz;
 316         attr.log_level = 1;
 317         load_attr->log_buf[0] = 0;
 318
 319         fd = sys_bpf_prog_load(&attr, sizeof(attr));
 320 done:
 321         free(finfo);
 322         free(linfo);
 323         return fd;
 324 }
 325
 326 int bpf_load_program_xattr(const struct bpf_load_program_attr *load_attr,
 327                            char *log_buf, size_t log_buf_sz)
 328 {
 329         struct bpf_prog_load_params p = {};
 330
 331         if (!load_attr || !log_buf != !log_buf_sz)
 332                 return -EINVAL;
 333
 334         p.prog_type = load_attr->prog_type;
 335         p.expected_attach_type = load_attr->expected_attach_type;
 336         switch (p.prog_type) {
 337         case BPF_PROG_TYPE_STRUCT_OPS:
 338         case BPF_PROG_TYPE_LSM:
 339                 p.attach_btf_id = load_attr->attach_btf_id;
 340                 break;
 341         case BPF_PROG_TYPE_TRACING:
 342         case BPF_PROG_TYPE_EXT:
 343                 p.attach_btf_id = load_attr->attach_btf_id;
 344                 p.attach_prog_fd = load_attr->attach_prog_fd;
 345                 break;
 346         default:
 347                 p.prog_ifindex = load_attr->prog_ifindex;
 348                 p.kern_version = load_attr->kern_version;
 349         }
 350         p.insn_cnt = load_attr->insns_cnt;
 351         p.insns = load_attr->insns;
 352         p.license = load_attr->license;
 353         p.log_level = load_attr->log_level;
 354         p.log_buf = log_buf;
 355         p.log_buf_sz = log_buf_sz;
 356         p.prog_btf_fd = load_attr->prog_btf_fd;
 357         p.func_info_rec_size = load_attr->func_info_rec_size;
 358         p.func_info_cnt = load_attr->func_info_cnt;
 359         p.func_info = load_attr->func_info;
 360         p.line_info_rec_size = load_attr->line_info_rec_size;
 361         p.line_info_cnt = load_attr->line_info_cnt;
 362         p.line_info = load_attr->line_info;
 363         p.name = load_attr->name;
 364         p.prog_flags = load_attr->prog_flags;
 365
 366         return libbpf__bpf_prog_load(&p);
 367 }
 368
 369 int bpf_load_program(enum bpf_prog_type type, const struct bpf_insn *insns,
 370                      size_t insns_cnt, const char *license,
 371                      __u32 kern_version, char *log_buf,
 372                      size_t log_buf_sz)
 373 {
 374         struct bpf_load_program_attr load_attr;
 375
 376         memset(&load_attr, 0, sizeof(struct bpf_load_program_attr));
 377         load_attr.prog_type = type;
 378         load_attr.expected_attach_type = 0;
 379         load_attr.name = NULL;
 380         load_attr.insns = insns;
 381         load_attr.insns_cnt = insns_cnt;
 382         load_attr.license = license;
 383         load_attr.kern_version = kern_version;
 384
 385         return bpf_load_program_xattr(&load_attr, log_buf, log_buf_sz);
 386 }
 387
 388 int bpf_verify_program(enum bpf_prog_type type, const struct bpf_insn *insns,
 389                        size_t insns_cnt, __u32 prog_flags, const char *license,
 390                        __u32 kern_version, char *log_buf, size_t log_buf_sz,
 391                        int log_level)
 392 {
 393         union bpf_attr attr;
 394
 395         memset(&attr, 0, sizeof(attr));
 396         attr.prog_type = type;
 397         attr.insn_cnt = (__u32)insns_cnt;
 398         attr.insns = ptr_to_u64(insns);
 399         attr.license = ptr_to_u64(license);
 400         attr.log_buf = ptr_to_u64(log_buf);
 401         attr.log_size = log_buf_sz;
 402         attr.log_level = log_level;
 403         log_buf[0] = 0;
 404         attr.kern_version = kern_version;
 405         attr.prog_flags = prog_flags;
 406
 407         return sys_bpf_prog_load(&attr, sizeof(attr));
 408 }
 409
 410 int bpf_map_update_elem(int fd, const void *key, const void *value,
 411                         __u64 flags)
 412 {
 413         union bpf_attr attr;
 414
 415         memset(&attr, 0, sizeof(attr));
 416         attr.map_fd = fd;
 417         attr.key = ptr_to_u64(key);
 418         attr.value = ptr_to_u64(value);
 419         attr.flags = flags;
 420
 421         return sys_bpf(BPF_MAP_UPDATE_ELEM, &attr, sizeof(attr));
 422 }
 423
 424 int bpf_map_lookup_elem(int fd, const void *key, void *value)
 425 {
 426         union bpf_attr attr;
 427
 428         memset(&attr, 0, sizeof(attr));
 429         attr.map_fd = fd;
 430         attr.key = ptr_to_u64(key);
 431         attr.value = ptr_to_u64(value);
 432
 433         return sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr));
 434 }
 435
 436 int bpf_map_lookup_elem_flags(int fd, const void *key, void *value, __u64 flags)
 437 {
 438         union bpf_attr attr;
 439
 440         memset(&attr, 0, sizeof(attr));
 441         attr.map_fd = fd;
 442         attr.key = ptr_to_u64(key);
 443         attr.value = ptr_to_u64(value);
 444         attr.flags = flags;
 445
 446         return sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr));
 447 }
 448
 449 int bpf_map_lookup_and_delete_elem(int fd, const void *key, void *value)
 450 {
 451         union bpf_attr attr;
 452
 453         memset(&attr, 0, sizeof(attr));
 454         attr.map_fd = fd;
 455         attr.key = ptr_to_u64(key);
 456         attr.value = ptr_to_u64(value);
 457
 458         return sys_bpf(BPF_MAP_LOOKUP_AND_DELETE_ELEM, &attr, sizeof(attr));
 459 }
 460
 461 int bpf_map_delete_elem(int fd, const void *key)
 462 {
 463         union bpf_attr attr;
 464
 465         memset(&attr, 0, sizeof(attr));
 466         attr.map_fd = fd;
 467         attr.key = ptr_to_u64(key);
 468
 469         return sys_bpf(BPF_MAP_DELETE_ELEM, &attr, sizeof(attr));
 470 }
 471
 472 int bpf_map_get_next_key(int fd, const void *key, void *next_key)
 473 {
 474         union bpf_attr attr;
 475
 476         memset(&attr, 0, sizeof(attr));
 477         attr.map_fd = fd;
 478         attr.key = ptr_to_u64(key);
 479         attr.next_key = ptr_to_u64(next_key);
 480
 481         return sys_bpf(BPF_MAP_GET_NEXT_KEY, &attr, sizeof(attr));
 482 }
 483
 484 int bpf_map_freeze(int fd)
 485 {
 486         union bpf_attr attr;
 487
 488         memset(&attr, 0, sizeof(attr));
 489         attr.map_fd = fd;
 490
 491         return sys_bpf(BPF_MAP_FREEZE, &attr, sizeof(attr));
 492 }
 493
 494 static int bpf_map_batch_common(int cmd, int fd, void  *in_batch,
 495                                 void *out_batch, void *keys, void *values,
 496                                 __u32 *count,
 497                                 const struct bpf_map_batch_opts *opts)
 498 {
 499         union bpf_attr attr;
 500         int ret;
 501
 502         if (!OPTS_VALID(opts, bpf_map_batch_opts))
 503                 return -EINVAL;
 504
 505         memset(&attr, 0, sizeof(attr));
 506         attr.batch.map_fd = fd;
 507         attr.batch.in_batch = ptr_to_u64(in_batch);
 508         attr.batch.out_batch = ptr_to_u64(out_batch);
 509         attr.batch.keys = ptr_to_u64(keys);
 510         attr.batch.values = ptr_to_u64(values);
 511         attr.batch.count = *count;
 512         attr.batch.elem_flags  = OPTS_GET(opts, elem_flags, 0);
 513         attr.batch.flags = OPTS_GET(opts, flags, 0);
 514
 515         ret = sys_bpf(cmd, &attr, sizeof(attr));
 516         *count = attr.batch.count;
 517
 518         return ret;
 519 }
 520
 521 int bpf_map_delete_batch(int fd, void *keys, __u32 *count,
 522                          const struct bpf_map_batch_opts *opts)
 523 {
 524         return bpf_map_batch_common(BPF_MAP_DELETE_BATCH, fd, NULL,
 525                                     NULL, keys, NULL, count, opts);
 526 }
 527
 528 int bpf_map_lookup_batch(int fd, void *in_batch, void *out_batch, void *keys,
 529                          void *values, __u32 *count,
 530                          const struct bpf_map_batch_opts *opts)
 531 {
 532         return bpf_map_batch_common(BPF_MAP_LOOKUP_BATCH, fd, in_batch,
 533                                     out_batch, keys, values, count, opts);
 534 }
 535
 536 int bpf_map_lookup_and_delete_batch(int fd, void *in_batch, void *out_batch,
 537                                     void *keys, void *values, __u32 *count,
 538                                     const struct bpf_map_batch_opts *opts)
 539 {
 540         return bpf_map_batch_common(BPF_MAP_LOOKUP_AND_DELETE_BATCH,
 541                                     fd, in_batch, out_batch, keys, values,
 542                                     count, opts);
 543 }
 544
 545 int bpf_map_update_batch(int fd, void *keys, void *values, __u32 *count,
 546                          const struct bpf_map_batch_opts *opts)
 547 {
 548         return bpf_map_batch_common(BPF_MAP_UPDATE_BATCH, fd, NULL, NULL,
 549                                     keys, values, count, opts);
 550 }
 551
 552 int bpf_obj_pin(int fd, const char *pathname)
 553 {
 554         union bpf_attr attr;
 555
 556         memset(&attr, 0, sizeof(attr));
 557         attr.pathname = ptr_to_u64((void *)pathname);
 558         attr.bpf_fd = fd;
 559
 560         return sys_bpf(BPF_OBJ_PIN, &attr, sizeof(attr));
 561 }
 562
 563 int bpf_obj_get(const char *pathname)
 564 {
 565         union bpf_attr attr;
 566
 567         memset(&attr, 0, sizeof(attr));
 568         attr.pathname = ptr_to_u64((void *)pathname);
 569
 570         return sys_bpf(BPF_OBJ_GET, &attr, sizeof(attr));
 571 }
 572
 573 int bpf_prog_attach(int prog_fd, int target_fd, enum bpf_attach_type type,
 574                     unsigned int flags)
 575 {
 576         DECLARE_LIBBPF_OPTS(bpf_prog_attach_opts, opts,
 577                 .flags = flags,
 578         );
 579
 580         return bpf_prog_attach_xattr(prog_fd, target_fd, type, &opts);
 581 }
 582
 583 int bpf_prog_attach_xattr(int prog_fd, int target_fd,
 584                           enum bpf_attach_type type,
 585                           const struct bpf_prog_attach_opts *opts)
 586 {
 587         union bpf_attr attr;
 588
 589         if (!OPTS_VALID(opts, bpf_prog_attach_opts))
 590                 return -EINVAL;
 591
 592         memset(&attr, 0, sizeof(attr));
 593         attr.target_fd     = target_fd;
 594         attr.attach_bpf_fd = prog_fd;
 595         attr.attach_type   = type;
 596         attr.attach_flags  = OPTS_GET(opts, flags, 0);
 597         attr.replace_bpf_fd = OPTS_GET(opts, replace_prog_fd, 0);
 598
 599         return sys_bpf(BPF_PROG_ATTACH, &attr, sizeof(attr));
 600 }
 601
 602 int bpf_prog_detach(int target_fd, enum bpf_attach_type type)
 603 {
 604         union bpf_attr attr;
 605
 606         memset(&attr, 0, sizeof(attr));
 607         attr.target_fd   = target_fd;
 608         attr.attach_type = type;
 609
 610         return sys_bpf(BPF_PROG_DETACH, &attr, sizeof(attr));
 611 }
 612
 613 int bpf_prog_detach2(int prog_fd, int target_fd, enum bpf_attach_type type)
 614 {
 615         union bpf_attr attr;
 616
 617         memset(&attr, 0, sizeof(attr));
 618         attr.target_fd   = target_fd;
 619         attr.attach_bpf_fd = prog_fd;
 620         attr.attach_type = type;
 621
 622         return sys_bpf(BPF_PROG_DETACH, &attr, sizeof(attr));
 623 }
 624
 625 int bpf_link_create(int prog_fd, int target_fd,
 626                     enum bpf_attach_type attach_type,
 627                     const struct bpf_link_create_opts *opts)
 628 {
 629         __u32 target_btf_id, iter_info_len;
 630         union bpf_attr attr;
 631
 632         if (!OPTS_VALID(opts, bpf_link_create_opts))
 633                 return -EINVAL;
 634
 635         iter_info_len = OPTS_GET(opts, iter_info_len, 0);
 636         target_btf_id = OPTS_GET(opts, target_btf_id, 0);
 637
 638         if (iter_info_len && target_btf_id)
 639                 return -EINVAL;
 640
 641         memset(&attr, 0, sizeof(attr));
 642         attr.link_create.prog_fd = prog_fd;
 643         attr.link_create.target_fd = target_fd;
 644         attr.link_create.attach_type = attach_type;
 645         attr.link_create.flags = OPTS_GET(opts, flags, 0);
 646
 647         if (iter_info_len) {
 648                 attr.link_create.iter_info =
 649                         ptr_to_u64(OPTS_GET(opts, iter_info, (void *)0));
 650                 attr.link_create.iter_info_len = iter_info_len;
 651         } else if (target_btf_id) {
 652                 attr.link_create.target_btf_id = target_btf_id;
 653         }
 654
 655         return sys_bpf(BPF_LINK_CREATE, &attr, sizeof(attr));
 656 }
 657
 658 int bpf_link_detach(int link_fd)
 659 {
 660         union bpf_attr attr;
 661
 662         memset(&attr, 0, sizeof(attr));
 663         attr.link_detach.link_fd = link_fd;
 664
 665         return sys_bpf(BPF_LINK_DETACH, &attr, sizeof(attr));
 666 }
 667
 668 int bpf_link_update(int link_fd, int new_prog_fd,
 669                     const struct bpf_link_update_opts *opts)
 670 {
 671         union bpf_attr attr;
 672
 673         if (!OPTS_VALID(opts, bpf_link_update_opts))
 674                 return -EINVAL;
 675
 676         memset(&attr, 0, sizeof(attr));
 677         attr.link_update.link_fd = link_fd;
 678         attr.link_update.new_prog_fd = new_prog_fd;
 679         attr.link_update.flags = OPTS_GET(opts, flags, 0);
 680         attr.link_update.old_prog_fd = OPTS_GET(opts, old_prog_fd, 0);
 681
 682         return sys_bpf(BPF_LINK_UPDATE, &attr, sizeof(attr));
 683 }
 684
 685 int bpf_iter_create(int link_fd)
 686 {
 687         union bpf_attr attr;
 688
 689         memset(&attr, 0, sizeof(attr));
 690         attr.iter_create.link_fd = link_fd;
 691
 692         return sys_bpf(BPF_ITER_CREATE, &attr, sizeof(attr));
 693 }
 694
 695 int bpf_prog_query(int target_fd, enum bpf_attach_type type, __u32 query_flags,
 696                    __u32 *attach_flags, __u32 *prog_ids, __u32 *prog_cnt)
 697 {
 698         union bpf_attr attr;
 699         int ret;
 700
 701         memset(&attr, 0, sizeof(attr));
 702         attr.query.target_fd    = target_fd;
 703         attr.query.attach_type  = type;
 704         attr.query.query_flags  = query_flags;
 705         attr.query.prog_cnt     = *prog_cnt;
 706         attr.query.prog_ids     = ptr_to_u64(prog_ids);
 707
 708         ret = sys_bpf(BPF_PROG_QUERY, &attr, sizeof(attr));
 709         if (attach_flags)
 710                 *attach_flags = attr.query.attach_flags;
 711         *prog_cnt = attr.query.prog_cnt;
 712         return ret;
 713 }
 714
 715 int bpf_prog_test_run(int prog_fd, int repeat, void *data, __u32 size,
 716                       void *data_out, __u32 *size_out, __u32 *retval,
 717                       __u32 *duration)
 718 {
 719         union bpf_attr attr;
 720         int ret;
 721
 722         memset(&attr, 0, sizeof(attr));
 723         attr.test.prog_fd = prog_fd;
 724         attr.test.data_in = ptr_to_u64(data);
 725         attr.test.data_out = ptr_to_u64(data_out);
 726         attr.test.data_size_in = size;
 727         attr.test.repeat = repeat;
 728
 729         ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, sizeof(attr));
 730         if (size_out)
 731                 *size_out = attr.test.data_size_out;
 732         if (retval)
 733                 *retval = attr.test.retval;
 734         if (duration)
 735                 *duration = attr.test.duration;
 736         return ret;
 737 }
 738
 739 int bpf_prog_test_run_xattr(struct bpf_prog_test_run_attr *test_attr)
 740 {
 741         union bpf_attr attr;
 742         int ret;
 743
 744         if (!test_attr->data_out && test_attr->data_size_out > 0)
 745                 return -EINVAL;
 746
 747         memset(&attr, 0, sizeof(attr));
 748         attr.test.prog_fd = test_attr->prog_fd;
 749         attr.test.data_in = ptr_to_u64(test_attr->data_in);
 750         attr.test.data_out = ptr_to_u64(test_attr->data_out);
 751         attr.test.data_size_in = test_attr->data_size_in;
 752         attr.test.data_size_out = test_attr->data_size_out;
 753         attr.test.ctx_in = ptr_to_u64(test_attr->ctx_in);
 754         attr.test.ctx_out = ptr_to_u64(test_attr->ctx_out);
 755         attr.test.ctx_size_in = test_attr->ctx_size_in;
 756         attr.test.ctx_size_out = test_attr->ctx_size_out;
 757         attr.test.repeat = test_attr->repeat;
 758
 759         ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, sizeof(attr));
 760         test_attr->data_size_out = attr.test.data_size_out;
 761         test_attr->ctx_size_out = attr.test.ctx_size_out;
 762         test_attr->retval = attr.test.retval;
 763         test_attr->duration = attr.test.duration;
 764         return ret;
 765 }
 766
 767 int bpf_prog_test_run_opts(int prog_fd, struct bpf_test_run_opts *opts)
 768 {
 769         union bpf_attr attr;
 770         int ret;
 771
 772         if (!OPTS_VALID(opts, bpf_test_run_opts))
 773                 return -EINVAL;
 774
 775         memset(&attr, 0, sizeof(attr));
 776         attr.test.prog_fd = prog_fd;
 777         attr.test.cpu = OPTS_GET(opts, cpu, 0);
 778         attr.test.flags = OPTS_GET(opts, flags, 0);
 779         attr.test.repeat = OPTS_GET(opts, repeat, 0);
 780         attr.test.duration = OPTS_GET(opts, duration, 0);
 781         attr.test.ctx_size_in = OPTS_GET(opts, ctx_size_in, 0);
 782         attr.test.ctx_size_out = OPTS_GET(opts, ctx_size_out, 0);
 783         attr.test.data_size_in = OPTS_GET(opts, data_size_in, 0);
 784         attr.test.data_size_out = OPTS_GET(opts, data_size_out, 0);
 785         attr.test.ctx_in = ptr_to_u64(OPTS_GET(opts, ctx_in, NULL));
 786         attr.test.ctx_out = ptr_to_u64(OPTS_GET(opts, ctx_out, NULL));
 787         attr.test.data_in = ptr_to_u64(OPTS_GET(opts, data_in, NULL));
 788         attr.test.data_out = ptr_to_u64(OPTS_GET(opts, data_out, NULL));
 789
 790         ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, sizeof(attr));
 791         OPTS_SET(opts, data_size_out, attr.test.data_size_out);
 792         OPTS_SET(opts, ctx_size_out, attr.test.ctx_size_out);
 793         OPTS_SET(opts, duration, attr.test.duration);
 794         OPTS_SET(opts, retval, attr.test.retval);
 795         return ret;
 796 }
 797
 798 static int bpf_obj_get_next_id(__u32 start_id, __u32 *next_id, int cmd)
 799 {
 800         union bpf_attr attr;
 801         int err;
 802
 803         memset(&attr, 0, sizeof(attr));
 804         attr.start_id = start_id;
 805
 806         err = sys_bpf(cmd, &attr, sizeof(attr));
 807         if (!err)
 808                 *next_id = attr.next_id;
 809
 810         return err;
 811 }
 812
 813 int bpf_prog_get_next_id(__u32 start_id, __u32 *next_id)
 814 {
 815         return bpf_obj_get_next_id(start_id, next_id, BPF_PROG_GET_NEXT_ID);
 816 }
 817
 818 int bpf_map_get_next_id(__u32 start_id, __u32 *next_id)
 819 {
 820         return bpf_obj_get_next_id(start_id, next_id, BPF_MAP_GET_NEXT_ID);
 821 }
 822
 823 int bpf_btf_get_next_id(__u32 start_id, __u32 *next_id)
 824 {
 825         return bpf_obj_get_next_id(start_id, next_id, BPF_BTF_GET_NEXT_ID);
 826 }
 827
 828 int bpf_link_get_next_id(__u32 start_id, __u32 *next_id)
 829 {
 830         return bpf_obj_get_next_id(start_id, next_id, BPF_LINK_GET_NEXT_ID);
 831 }
 832
 833 int bpf_prog_get_fd_by_id(__u32 id)
 834 {
 835         union bpf_attr attr;
 836
 837         memset(&attr, 0, sizeof(attr));
 838         attr.prog_id = id;
 839
 840         return sys_bpf(BPF_PROG_GET_FD_BY_ID, &attr, sizeof(attr));
 841 }
 842
 843 int bpf_map_get_fd_by_id(__u32 id)
 844 {
 845         union bpf_attr attr;
 846
 847         memset(&attr, 0, sizeof(attr));
 848         attr.map_id = id;
 849
 850         return sys_bpf(BPF_MAP_GET_FD_BY_ID, &attr, sizeof(attr));
 851 }
 852
 853 int bpf_btf_get_fd_by_id(__u32 id)
 854 {
 855         union bpf_attr attr;
 856
 857         memset(&attr, 0, sizeof(attr));
 858         attr.btf_id = id;
 859
 860         return sys_bpf(BPF_BTF_GET_FD_BY_ID, &attr, sizeof(attr));
 861 }
 862
 863 int bpf_link_get_fd_by_id(__u32 id)
 864 {
 865         union bpf_attr attr;
 866
 867         memset(&attr, 0, sizeof(attr));
 868         attr.link_id = id;
 869
 870         return sys_bpf(BPF_LINK_GET_FD_BY_ID, &attr, sizeof(attr));
 871 }
 872
 873 int bpf_obj_get_info_by_fd(int bpf_fd, void *info, __u32 *info_len)
 874 {
 875         union bpf_attr attr;
 876         int err;
 877
 878         memset(&attr, 0, sizeof(attr));
 879         attr.info.bpf_fd = bpf_fd;
 880         attr.info.info_len = *info_len;
 881         attr.info.info = ptr_to_u64(info);
 882
 883         err = sys_bpf(BPF_OBJ_GET_INFO_BY_FD, &attr, sizeof(attr));
 884         if (!err)
 885                 *info_len = attr.info.info_len;
 886
 887         return err;
 888 }
 889
 890 int bpf_raw_tracepoint_open(const char *name, int prog_fd)
 891 {
 892         union bpf_attr attr;
 893
 894         memset(&attr, 0, sizeof(attr));
 895         attr.raw_tracepoint.name = ptr_to_u64(name);
 896         attr.raw_tracepoint.prog_fd = prog_fd;
 897
 898         return sys_bpf(BPF_RAW_TRACEPOINT_OPEN, &attr, sizeof(attr));
 899 }
 900
 901 int bpf_load_btf(const void *btf, __u32 btf_size, char *log_buf, __u32 log_buf_size,
 902                  bool do_log)
 903 {
 904         union bpf_attr attr = {};
 905         int fd;
 906
 907         attr.btf = ptr_to_u64(btf);
 908         attr.btf_size = btf_size;
 909
 910 retry:
 911         if (do_log && log_buf && log_buf_size) {
 912                 attr.btf_log_level = 1;
 913                 attr.btf_log_size = log_buf_size;
 914                 attr.btf_log_buf = ptr_to_u64(log_buf);
 915         }
 916
 917         fd = sys_bpf(BPF_BTF_LOAD, &attr, sizeof(attr));
 918         if (fd == -1 && !do_log && log_buf && log_buf_size) {
 919                 do_log = true;
 920                 goto retry;
 921         }
 922
 923         return fd;
 924 }
 925
 926 int bpf_task_fd_query(int pid, int fd, __u32 flags, char *buf, __u32 *buf_len,
 927                       __u32 *prog_id, __u32 *fd_type, __u64 *probe_offset,
 928                       __u64 *probe_addr)
 929 {
 930         union bpf_attr attr = {};
 931         int err;
 932
 933         attr.task_fd_query.pid = pid;
 934         attr.task_fd_query.fd = fd;
 935         attr.task_fd_query.flags = flags;
 936         attr.task_fd_query.buf = ptr_to_u64(buf);
 937         attr.task_fd_query.buf_len = *buf_len;
 938
 939         err = sys_bpf(BPF_TASK_FD_QUERY, &attr, sizeof(attr));
 940         *buf_len = attr.task_fd_query.buf_len;
 941         *prog_id = attr.task_fd_query.prog_id;
 942         *fd_type = attr.task_fd_query.fd_type;
 943         *probe_offset = attr.task_fd_query.probe_offset;
 944         *probe_addr = attr.task_fd_query.probe_addr;
 945
 946         return err;
 947 }
 948
 949 int bpf_enable_stats(enum bpf_stats_type type)
 950 {
 951         union bpf_attr attr;
 952
 953         memset(&attr, 0, sizeof(attr));
 954         attr.enable_stats.type = type;
 955
 956         return sys_bpf(BPF_ENABLE_STATS, &attr, sizeof(attr));
 957 }
 958
 959 int bpf_prog_bind_map(int prog_fd, int map_fd,
 960                       const struct bpf_prog_bind_opts *opts)
 961 {
 962         union bpf_attr attr;
 963
 964         if (!OPTS_VALID(opts, bpf_prog_bind_opts))
 965                 return -EINVAL;
 966
 967         memset(&attr, 0, sizeof(attr));
 968         attr.prog_bind_map.prog_fd = prog_fd;
 969         attr.prog_bind_map.map_fd = map_fd;
 970         attr.prog_bind_map.flags = OPTS_GET(opts, flags, 0);
 971
 972         return sys_bpf(BPF_PROG_BIND_MAP, &attr, sizeof(attr));
 973 }