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 /* make sure libbpf doesn't use kernel-only integer typedefs */
  36 #pragma GCC poison u8 u16 u32 u64 s8 s16 s32 s64
  37
  38 /*
  39  * When building perf, unistd.h is overridden. __NR_bpf is
  40  * required to be defined explicitly.
  41  */
  42 #ifndef __NR_bpf
  43 # if defined(__i386__)
  44 #  define __NR_bpf 357
  45 # elif defined(__x86_64__)
  46 #  define __NR_bpf 321
  47 # elif defined(__aarch64__)
  48 #  define __NR_bpf 280
  49 # elif defined(__sparc__)
  50 #  define __NR_bpf 349
  51 # elif defined(__s390__)
  52 #  define __NR_bpf 351
  53 # elif defined(__arc__)
  54 #  define __NR_bpf 280
  55 # else
  56 #  error __NR_bpf not defined. libbpf does not support your arch.
  57 # endif
  58 #endif
  59
  60 static inline __u64 ptr_to_u64(const void *ptr)
  61 {
  62         return (__u64) (unsigned long) ptr;
  63 }
  64
  65 static inline int sys_bpf(enum bpf_cmd cmd, union bpf_attr *attr,
  66                           unsigned int size)
  67 {
  68         return syscall(__NR_bpf, cmd, attr, size);
  69 }
  70
  71 static inline int sys_bpf_prog_load(union bpf_attr *attr, unsigned int size)
  72 {
  73         int fd;
  74
  75         do {
  76                 fd = sys_bpf(BPF_PROG_LOAD, attr, size);
  77         } while (fd < 0 && errno == EAGAIN);
  78
  79         return fd;
  80 }
  81
  82 int bpf_create_map_xattr(const struct bpf_create_map_attr *create_attr)
  83 {
  84         union bpf_attr attr;
  85
  86         memset(&attr, '\0', sizeof(attr));
  87
  88         attr.map_type = create_attr->map_type;
  89         attr.key_size = create_attr->key_size;
  90         attr.value_size = create_attr->value_size;
  91         attr.max_entries = create_attr->max_entries;
  92         attr.map_flags = create_attr->map_flags;
  93         if (create_attr->name)
  94                 memcpy(attr.map_name, create_attr->name,
  95                        min(strlen(create_attr->name), BPF_OBJ_NAME_LEN - 1));
  96         attr.numa_node = create_attr->numa_node;
  97         attr.btf_fd = create_attr->btf_fd;
  98         attr.btf_key_type_id = create_attr->btf_key_type_id;
  99         attr.btf_value_type_id = create_attr->btf_value_type_id;
 100         attr.map_ifindex = create_attr->map_ifindex;
 101         if (attr.map_type == BPF_MAP_TYPE_STRUCT_OPS)
 102                 attr.btf_vmlinux_value_type_id =
 103                         create_attr->btf_vmlinux_value_type_id;
 104         else
 105                 attr.inner_map_fd = create_attr->inner_map_fd;
 106
 107         return sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr));
 108 }
 109
 110 int bpf_create_map_node(enum bpf_map_type map_type, const char *name,
 111                         int key_size, int value_size, int max_entries,
 112                         __u32 map_flags, int node)
 113 {
 114         struct bpf_create_map_attr map_attr = {};
 115
 116         map_attr.name = name;
 117         map_attr.map_type = map_type;
 118         map_attr.map_flags = map_flags;
 119         map_attr.key_size = key_size;
 120         map_attr.value_size = value_size;
 121         map_attr.max_entries = max_entries;
 122         if (node >= 0) {
 123                 map_attr.numa_node = node;
 124                 map_attr.map_flags |= BPF_F_NUMA_NODE;
 125         }
 126
 127         return bpf_create_map_xattr(&map_attr);
 128 }
 129
 130 int bpf_create_map(enum bpf_map_type map_type, int key_size,
 131                    int value_size, int max_entries, __u32 map_flags)
 132 {
 133         struct bpf_create_map_attr map_attr = {};
 134
 135         map_attr.map_type = map_type;
 136         map_attr.map_flags = map_flags;
 137         map_attr.key_size = key_size;
 138         map_attr.value_size = value_size;
 139         map_attr.max_entries = max_entries;
 140
 141         return bpf_create_map_xattr(&map_attr);
 142 }
 143
 144 int bpf_create_map_name(enum bpf_map_type map_type, const char *name,
 145                         int key_size, int value_size, int max_entries,
 146                         __u32 map_flags)
 147 {
 148         struct bpf_create_map_attr map_attr = {};
 149
 150         map_attr.name = name;
 151         map_attr.map_type = map_type;
 152         map_attr.map_flags = map_flags;
 153         map_attr.key_size = key_size;
 154         map_attr.value_size = value_size;
 155         map_attr.max_entries = max_entries;
 156
 157         return bpf_create_map_xattr(&map_attr);
 158 }
 159
 160 int bpf_create_map_in_map_node(enum bpf_map_type map_type, const char *name,
 161                                int key_size, int inner_map_fd, int max_entries,
 162                                __u32 map_flags, int node)
 163 {
 164         union bpf_attr attr;
 165
 166         memset(&attr, '\0', sizeof(attr));
 167
 168         attr.map_type = map_type;
 169         attr.key_size = key_size;
 170         attr.value_size = 4;
 171         attr.inner_map_fd = inner_map_fd;
 172         attr.max_entries = max_entries;
 173         attr.map_flags = map_flags;
 174         if (name)
 175                 memcpy(attr.map_name, name,
 176                        min(strlen(name), BPF_OBJ_NAME_LEN - 1));
 177
 178         if (node >= 0) {
 179                 attr.map_flags |= BPF_F_NUMA_NODE;
 180                 attr.numa_node = node;
 181         }
 182
 183         return sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr));
 184 }
 185
 186 int bpf_create_map_in_map(enum bpf_map_type map_type, const char *name,
 187                           int key_size, int inner_map_fd, int max_entries,
 188                           __u32 map_flags)
 189 {
 190         return bpf_create_map_in_map_node(map_type, name, key_size,
 191                                           inner_map_fd, max_entries, map_flags,
 192                                           -1);
 193 }
 194
 195 static void *
 196 alloc_zero_tailing_info(const void *orecord, __u32 cnt,
 197                         __u32 actual_rec_size, __u32 expected_rec_size)
 198 {
 199         __u64 info_len = (__u64)actual_rec_size * cnt;
 200         void *info, *nrecord;
 201         int i;
 202
 203         info = malloc(info_len);
 204         if (!info)
 205                 return NULL;
 206
 207         /* zero out bytes kernel does not understand */
 208         nrecord = info;
 209         for (i = 0; i < cnt; i++) {
 210                 memcpy(nrecord, orecord, expected_rec_size);
 211                 memset(nrecord + expected_rec_size, 0,
 212                        actual_rec_size - expected_rec_size);
 213                 orecord += actual_rec_size;
 214                 nrecord += actual_rec_size;
 215         }
 216
 217         return info;
 218 }
 219
 220 int bpf_load_program_xattr(const struct bpf_load_program_attr *load_attr,
 221                            char *log_buf, size_t log_buf_sz)
 222 {
 223         void *finfo = NULL, *linfo = NULL;
 224         union bpf_attr attr;
 225         __u32 log_level;
 226         int fd;
 227
 228         if (!load_attr || !log_buf != !log_buf_sz)
 229                 return -EINVAL;
 230
 231         log_level = load_attr->log_level;
 232         if (log_level > (4 | 2 | 1) || (log_level && !log_buf))
 233                 return -EINVAL;
 234
 235         memset(&attr, 0, sizeof(attr));
 236         attr.prog_type = load_attr->prog_type;
 237         attr.expected_attach_type = load_attr->expected_attach_type;
 238         if (attr.prog_type == BPF_PROG_TYPE_STRUCT_OPS ||
 239             attr.prog_type == BPF_PROG_TYPE_LSM) {
 240                 attr.attach_btf_id = load_attr->attach_btf_id;
 241         } else if (attr.prog_type == BPF_PROG_TYPE_TRACING ||
 242                    attr.prog_type == BPF_PROG_TYPE_EXT) {
 243                 attr.attach_btf_id = load_attr->attach_btf_id;
 244                 attr.attach_prog_fd = load_attr->attach_prog_fd;
 245         } else {
 246                 attr.prog_ifindex = load_attr->prog_ifindex;
 247                 attr.kern_version = load_attr->kern_version;
 248         }
 249         attr.insn_cnt = (__u32)load_attr->insns_cnt;
 250         attr.insns = ptr_to_u64(load_attr->insns);
 251         attr.license = ptr_to_u64(load_attr->license);
 252
 253         attr.log_level = log_level;
 254         if (log_level) {
 255                 attr.log_buf = ptr_to_u64(log_buf);
 256                 attr.log_size = log_buf_sz;
 257         } else {
 258                 attr.log_buf = ptr_to_u64(NULL);
 259                 attr.log_size = 0;
 260         }
 261
 262         attr.prog_btf_fd = load_attr->prog_btf_fd;
 263         attr.func_info_rec_size = load_attr->func_info_rec_size;
 264         attr.func_info_cnt = load_attr->func_info_cnt;
 265         attr.func_info = ptr_to_u64(load_attr->func_info);
 266         attr.line_info_rec_size = load_attr->line_info_rec_size;
 267         attr.line_info_cnt = load_attr->line_info_cnt;
 268         attr.line_info = ptr_to_u64(load_attr->line_info);
 269         if (load_attr->name)
 270                 memcpy(attr.prog_name, load_attr->name,
 271                        min(strlen(load_attr->name), BPF_OBJ_NAME_LEN - 1));
 272         attr.prog_flags = load_attr->prog_flags;
 273
 274         fd = sys_bpf_prog_load(&attr, sizeof(attr));
 275         if (fd >= 0)
 276                 return fd;
 277
 278         /* After bpf_prog_load, the kernel may modify certain attributes
 279          * to give user space a hint how to deal with loading failure.
 280          * Check to see whether we can make some changes and load again.
 281          */
 282         while (errno == E2BIG && (!finfo || !linfo)) {
 283                 if (!finfo && attr.func_info_cnt &&
 284                     attr.func_info_rec_size < load_attr->func_info_rec_size) {
 285                         /* try with corrected func info records */
 286                         finfo = alloc_zero_tailing_info(load_attr->func_info,
 287                                                         load_attr->func_info_cnt,
 288                                                         load_attr->func_info_rec_size,
 289                                                         attr.func_info_rec_size);
 290                         if (!finfo)
 291                                 goto done;
 292
 293                         attr.func_info = ptr_to_u64(finfo);
 294                         attr.func_info_rec_size = load_attr->func_info_rec_size;
 295                 } else if (!linfo && attr.line_info_cnt &&
 296                            attr.line_info_rec_size <
 297                            load_attr->line_info_rec_size) {
 298                         linfo = alloc_zero_tailing_info(load_attr->line_info,
 299                                                         load_attr->line_info_cnt,
 300                                                         load_attr->line_info_rec_size,
 301                                                         attr.line_info_rec_size);
 302                         if (!linfo)
 303                                 goto done;
 304
 305                         attr.line_info = ptr_to_u64(linfo);
 306                         attr.line_info_rec_size = load_attr->line_info_rec_size;
 307                 } else {
 308                         break;
 309                 }
 310
 311                 fd = sys_bpf_prog_load(&attr, sizeof(attr));
 312
 313                 if (fd >= 0)
 314                         goto done;
 315         }
 316
 317         if (log_level || !log_buf)
 318                 goto done;
 319
 320         /* Try again with log */
 321         attr.log_buf = ptr_to_u64(log_buf);
 322         attr.log_size = log_buf_sz;
 323         attr.log_level = 1;
 324         log_buf[0] = 0;
 325         fd = sys_bpf_prog_load(&attr, sizeof(attr));
 326 done:
 327         free(finfo);
 328         free(linfo);
 329         return fd;
 330 }
 331
 332 int bpf_load_program(enum bpf_prog_type type, const struct bpf_insn *insns,
 333                      size_t insns_cnt, const char *license,
 334                      __u32 kern_version, char *log_buf,
 335                      size_t log_buf_sz)
 336 {
 337         struct bpf_load_program_attr load_attr;
 338
 339         memset(&load_attr, 0, sizeof(struct bpf_load_program_attr));
 340         load_attr.prog_type = type;
 341         load_attr.expected_attach_type = 0;
 342         load_attr.name = NULL;
 343         load_attr.insns = insns;
 344         load_attr.insns_cnt = insns_cnt;
 345         load_attr.license = license;
 346         load_attr.kern_version = kern_version;
 347
 348         return bpf_load_program_xattr(&load_attr, log_buf, log_buf_sz);
 349 }
 350
 351 int bpf_verify_program(enum bpf_prog_type type, const struct bpf_insn *insns,
 352                        size_t insns_cnt, __u32 prog_flags, const char *license,
 353                        __u32 kern_version, char *log_buf, size_t log_buf_sz,
 354                        int log_level)
 355 {
 356         union bpf_attr attr;
 357
 358         memset(&attr, 0, sizeof(attr));
 359         attr.prog_type = type;
 360         attr.insn_cnt = (__u32)insns_cnt;
 361         attr.insns = ptr_to_u64(insns);
 362         attr.license = ptr_to_u64(license);
 363         attr.log_buf = ptr_to_u64(log_buf);
 364         attr.log_size = log_buf_sz;
 365         attr.log_level = log_level;
 366         log_buf[0] = 0;
 367         attr.kern_version = kern_version;
 368         attr.prog_flags = prog_flags;
 369
 370         return sys_bpf_prog_load(&attr, sizeof(attr));
 371 }
 372
 373 int bpf_map_update_elem(int fd, const void *key, const void *value,
 374                         __u64 flags)
 375 {
 376         union bpf_attr attr;
 377
 378         memset(&attr, 0, sizeof(attr));
 379         attr.map_fd = fd;
 380         attr.key = ptr_to_u64(key);
 381         attr.value = ptr_to_u64(value);
 382         attr.flags = flags;
 383
 384         return sys_bpf(BPF_MAP_UPDATE_ELEM, &attr, sizeof(attr));
 385 }
 386
 387 int bpf_map_lookup_elem(int fd, const void *key, void *value)
 388 {
 389         union bpf_attr attr;
 390
 391         memset(&attr, 0, sizeof(attr));
 392         attr.map_fd = fd;
 393         attr.key = ptr_to_u64(key);
 394         attr.value = ptr_to_u64(value);
 395
 396         return sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr));
 397 }
 398
 399 int bpf_map_lookup_elem_flags(int fd, const void *key, void *value, __u64 flags)
 400 {
 401         union bpf_attr attr;
 402
 403         memset(&attr, 0, sizeof(attr));
 404         attr.map_fd = fd;
 405         attr.key = ptr_to_u64(key);
 406         attr.value = ptr_to_u64(value);
 407         attr.flags = flags;
 408
 409         return sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr));
 410 }
 411
 412 int bpf_map_lookup_and_delete_elem(int fd, const void *key, void *value)
 413 {
 414         union bpf_attr attr;
 415
 416         memset(&attr, 0, sizeof(attr));
 417         attr.map_fd = fd;
 418         attr.key = ptr_to_u64(key);
 419         attr.value = ptr_to_u64(value);
 420
 421         return sys_bpf(BPF_MAP_LOOKUP_AND_DELETE_ELEM, &attr, sizeof(attr));
 422 }
 423
 424 int bpf_map_delete_elem(int fd, const void *key)
 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
 432         return sys_bpf(BPF_MAP_DELETE_ELEM, &attr, sizeof(attr));
 433 }
 434
 435 int bpf_map_get_next_key(int fd, const void *key, void *next_key)
 436 {
 437         union bpf_attr attr;
 438
 439         memset(&attr, 0, sizeof(attr));
 440         attr.map_fd = fd;
 441         attr.key = ptr_to_u64(key);
 442         attr.next_key = ptr_to_u64(next_key);
 443
 444         return sys_bpf(BPF_MAP_GET_NEXT_KEY, &attr, sizeof(attr));
 445 }
 446
 447 int bpf_map_freeze(int fd)
 448 {
 449         union bpf_attr attr;
 450
 451         memset(&attr, 0, sizeof(attr));
 452         attr.map_fd = fd;
 453
 454         return sys_bpf(BPF_MAP_FREEZE, &attr, sizeof(attr));
 455 }
 456
 457 static int bpf_map_batch_common(int cmd, int fd, void  *in_batch,
 458                                 void *out_batch, void *keys, void *values,
 459                                 __u32 *count,
 460                                 const struct bpf_map_batch_opts *opts)
 461 {
 462         union bpf_attr attr;
 463         int ret;
 464
 465         if (!OPTS_VALID(opts, bpf_map_batch_opts))
 466                 return -EINVAL;
 467
 468         memset(&attr, 0, sizeof(attr));
 469         attr.batch.map_fd = fd;
 470         attr.batch.in_batch = ptr_to_u64(in_batch);
 471         attr.batch.out_batch = ptr_to_u64(out_batch);
 472         attr.batch.keys = ptr_to_u64(keys);
 473         attr.batch.values = ptr_to_u64(values);
 474         attr.batch.count = *count;
 475         attr.batch.elem_flags  = OPTS_GET(opts, elem_flags, 0);
 476         attr.batch.flags = OPTS_GET(opts, flags, 0);
 477
 478         ret = sys_bpf(cmd, &attr, sizeof(attr));
 479         *count = attr.batch.count;
 480
 481         return ret;
 482 }
 483
 484 int bpf_map_delete_batch(int fd, void *keys, __u32 *count,
 485                          const struct bpf_map_batch_opts *opts)
 486 {
 487         return bpf_map_batch_common(BPF_MAP_DELETE_BATCH, fd, NULL,
 488                                     NULL, keys, NULL, count, opts);
 489 }
 490
 491 int bpf_map_lookup_batch(int fd, void *in_batch, void *out_batch, void *keys,
 492                          void *values, __u32 *count,
 493                          const struct bpf_map_batch_opts *opts)
 494 {
 495         return bpf_map_batch_common(BPF_MAP_LOOKUP_BATCH, fd, in_batch,
 496                                     out_batch, keys, values, count, opts);
 497 }
 498
 499 int bpf_map_lookup_and_delete_batch(int fd, void *in_batch, void *out_batch,
 500                                     void *keys, void *values, __u32 *count,
 501                                     const struct bpf_map_batch_opts *opts)
 502 {
 503         return bpf_map_batch_common(BPF_MAP_LOOKUP_AND_DELETE_BATCH,
 504                                     fd, in_batch, out_batch, keys, values,
 505                                     count, opts);
 506 }
 507
 508 int bpf_map_update_batch(int fd, void *keys, void *values, __u32 *count,
 509                          const struct bpf_map_batch_opts *opts)
 510 {
 511         return bpf_map_batch_common(BPF_MAP_UPDATE_BATCH, fd, NULL, NULL,
 512                                     keys, values, count, opts);
 513 }
 514
 515 int bpf_obj_pin(int fd, const char *pathname)
 516 {
 517         union bpf_attr attr;
 518
 519         memset(&attr, 0, sizeof(attr));
 520         attr.pathname = ptr_to_u64((void *)pathname);
 521         attr.bpf_fd = fd;
 522
 523         return sys_bpf(BPF_OBJ_PIN, &attr, sizeof(attr));
 524 }
 525
 526 int bpf_obj_get(const char *pathname)
 527 {
 528         union bpf_attr attr;
 529
 530         memset(&attr, 0, sizeof(attr));
 531         attr.pathname = ptr_to_u64((void *)pathname);
 532
 533         return sys_bpf(BPF_OBJ_GET, &attr, sizeof(attr));
 534 }
 535
 536 int bpf_prog_attach(int prog_fd, int target_fd, enum bpf_attach_type type,
 537                     unsigned int flags)
 538 {
 539         DECLARE_LIBBPF_OPTS(bpf_prog_attach_opts, opts,
 540                 .flags = flags,
 541         );
 542
 543         return bpf_prog_attach_xattr(prog_fd, target_fd, type, &opts);
 544 }
 545
 546 int bpf_prog_attach_xattr(int prog_fd, int target_fd,
 547                           enum bpf_attach_type type,
 548                           const struct bpf_prog_attach_opts *opts)
 549 {
 550         union bpf_attr attr;
 551
 552         if (!OPTS_VALID(opts, bpf_prog_attach_opts))
 553                 return -EINVAL;
 554
 555         memset(&attr, 0, sizeof(attr));
 556         attr.target_fd     = target_fd;
 557         attr.attach_bpf_fd = prog_fd;
 558         attr.attach_type   = type;
 559         attr.attach_flags  = OPTS_GET(opts, flags, 0);
 560         attr.replace_bpf_fd = OPTS_GET(opts, replace_prog_fd, 0);
 561
 562         return sys_bpf(BPF_PROG_ATTACH, &attr, sizeof(attr));
 563 }
 564
 565 int bpf_prog_detach(int target_fd, enum bpf_attach_type type)
 566 {
 567         union bpf_attr attr;
 568
 569         memset(&attr, 0, sizeof(attr));
 570         attr.target_fd   = target_fd;
 571         attr.attach_type = type;
 572
 573         return sys_bpf(BPF_PROG_DETACH, &attr, sizeof(attr));
 574 }
 575
 576 int bpf_prog_detach2(int prog_fd, int target_fd, enum bpf_attach_type type)
 577 {
 578         union bpf_attr attr;
 579
 580         memset(&attr, 0, sizeof(attr));
 581         attr.target_fd   = target_fd;
 582         attr.attach_bpf_fd = prog_fd;
 583         attr.attach_type = type;
 584
 585         return sys_bpf(BPF_PROG_DETACH, &attr, sizeof(attr));
 586 }
 587
 588 int bpf_link_create(int prog_fd, int target_fd,
 589                     enum bpf_attach_type attach_type,
 590                     const struct bpf_link_create_opts *opts)
 591 {
 592         union bpf_attr attr;
 593
 594         if (!OPTS_VALID(opts, bpf_link_create_opts))
 595                 return -EINVAL;
 596
 597         memset(&attr, 0, sizeof(attr));
 598         attr.link_create.prog_fd = prog_fd;
 599         attr.link_create.target_fd = target_fd;
 600         attr.link_create.attach_type = attach_type;
 601
 602         return sys_bpf(BPF_LINK_CREATE, &attr, sizeof(attr));
 603 }
 604
 605 int bpf_link_update(int link_fd, int new_prog_fd,
 606                     const struct bpf_link_update_opts *opts)
 607 {
 608         union bpf_attr attr;
 609
 610         if (!OPTS_VALID(opts, bpf_link_update_opts))
 611                 return -EINVAL;
 612
 613         memset(&attr, 0, sizeof(attr));
 614         attr.link_update.link_fd = link_fd;
 615         attr.link_update.new_prog_fd = new_prog_fd;
 616         attr.link_update.flags = OPTS_GET(opts, flags, 0);
 617         attr.link_update.old_prog_fd = OPTS_GET(opts, old_prog_fd, 0);
 618
 619         return sys_bpf(BPF_LINK_UPDATE, &attr, sizeof(attr));
 620 }
 621
 622 int bpf_prog_query(int target_fd, enum bpf_attach_type type, __u32 query_flags,
 623                    __u32 *attach_flags, __u32 *prog_ids, __u32 *prog_cnt)
 624 {
 625         union bpf_attr attr;
 626         int ret;
 627
 628         memset(&attr, 0, sizeof(attr));
 629         attr.query.target_fd    = target_fd;
 630         attr.query.attach_type  = type;
 631         attr.query.query_flags  = query_flags;
 632         attr.query.prog_cnt     = *prog_cnt;
 633         attr.query.prog_ids     = ptr_to_u64(prog_ids);
 634
 635         ret = sys_bpf(BPF_PROG_QUERY, &attr, sizeof(attr));
 636         if (attach_flags)
 637                 *attach_flags = attr.query.attach_flags;
 638         *prog_cnt = attr.query.prog_cnt;
 639         return ret;
 640 }
 641
 642 int bpf_prog_test_run(int prog_fd, int repeat, void *data, __u32 size,
 643                       void *data_out, __u32 *size_out, __u32 *retval,
 644                       __u32 *duration)
 645 {
 646         union bpf_attr attr;
 647         int ret;
 648
 649         memset(&attr, 0, sizeof(attr));
 650         attr.test.prog_fd = prog_fd;
 651         attr.test.data_in = ptr_to_u64(data);
 652         attr.test.data_out = ptr_to_u64(data_out);
 653         attr.test.data_size_in = size;
 654         attr.test.repeat = repeat;
 655
 656         ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, sizeof(attr));
 657         if (size_out)
 658                 *size_out = attr.test.data_size_out;
 659         if (retval)
 660                 *retval = attr.test.retval;
 661         if (duration)
 662                 *duration = attr.test.duration;
 663         return ret;
 664 }
 665
 666 int bpf_prog_test_run_xattr(struct bpf_prog_test_run_attr *test_attr)
 667 {
 668         union bpf_attr attr;
 669         int ret;
 670
 671         if (!test_attr->data_out && test_attr->data_size_out > 0)
 672                 return -EINVAL;
 673
 674         memset(&attr, 0, sizeof(attr));
 675         attr.test.prog_fd = test_attr->prog_fd;
 676         attr.test.data_in = ptr_to_u64(test_attr->data_in);
 677         attr.test.data_out = ptr_to_u64(test_attr->data_out);
 678         attr.test.data_size_in = test_attr->data_size_in;
 679         attr.test.data_size_out = test_attr->data_size_out;
 680         attr.test.ctx_in = ptr_to_u64(test_attr->ctx_in);
 681         attr.test.ctx_out = ptr_to_u64(test_attr->ctx_out);
 682         attr.test.ctx_size_in = test_attr->ctx_size_in;
 683         attr.test.ctx_size_out = test_attr->ctx_size_out;
 684         attr.test.repeat = test_attr->repeat;
 685
 686         ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, sizeof(attr));
 687         test_attr->data_size_out = attr.test.data_size_out;
 688         test_attr->ctx_size_out = attr.test.ctx_size_out;
 689         test_attr->retval = attr.test.retval;
 690         test_attr->duration = attr.test.duration;
 691         return ret;
 692 }
 693
 694 static int bpf_obj_get_next_id(__u32 start_id, __u32 *next_id, int cmd)
 695 {
 696         union bpf_attr attr;
 697         int err;
 698
 699         memset(&attr, 0, sizeof(attr));
 700         attr.start_id = start_id;
 701
 702         err = sys_bpf(cmd, &attr, sizeof(attr));
 703         if (!err)
 704                 *next_id = attr.next_id;
 705
 706         return err;
 707 }
 708
 709 int bpf_prog_get_next_id(__u32 start_id, __u32 *next_id)
 710 {
 711         return bpf_obj_get_next_id(start_id, next_id, BPF_PROG_GET_NEXT_ID);
 712 }
 713
 714 int bpf_map_get_next_id(__u32 start_id, __u32 *next_id)
 715 {
 716         return bpf_obj_get_next_id(start_id, next_id, BPF_MAP_GET_NEXT_ID);
 717 }
 718
 719 int bpf_btf_get_next_id(__u32 start_id, __u32 *next_id)
 720 {
 721         return bpf_obj_get_next_id(start_id, next_id, BPF_BTF_GET_NEXT_ID);
 722 }
 723
 724 int bpf_prog_get_fd_by_id(__u32 id)
 725 {
 726         union bpf_attr attr;
 727
 728         memset(&attr, 0, sizeof(attr));
 729         attr.prog_id = id;
 730
 731         return sys_bpf(BPF_PROG_GET_FD_BY_ID, &attr, sizeof(attr));
 732 }
 733
 734 int bpf_map_get_fd_by_id(__u32 id)
 735 {
 736         union bpf_attr attr;
 737
 738         memset(&attr, 0, sizeof(attr));
 739         attr.map_id = id;
 740
 741         return sys_bpf(BPF_MAP_GET_FD_BY_ID, &attr, sizeof(attr));
 742 }
 743
 744 int bpf_btf_get_fd_by_id(__u32 id)
 745 {
 746         union bpf_attr attr;
 747
 748         memset(&attr, 0, sizeof(attr));
 749         attr.btf_id = id;
 750
 751         return sys_bpf(BPF_BTF_GET_FD_BY_ID, &attr, sizeof(attr));
 752 }
 753
 754 int bpf_obj_get_info_by_fd(int prog_fd, void *info, __u32 *info_len)
 755 {
 756         union bpf_attr attr;
 757         int err;
 758
 759         memset(&attr, 0, sizeof(attr));
 760         attr.info.bpf_fd = prog_fd;
 761         attr.info.info_len = *info_len;
 762         attr.info.info = ptr_to_u64(info);
 763
 764         err = sys_bpf(BPF_OBJ_GET_INFO_BY_FD, &attr, sizeof(attr));
 765         if (!err)
 766                 *info_len = attr.info.info_len;
 767
 768         return err;
 769 }
 770
 771 int bpf_raw_tracepoint_open(const char *name, int prog_fd)
 772 {
 773         union bpf_attr attr;
 774
 775         memset(&attr, 0, sizeof(attr));
 776         attr.raw_tracepoint.name = ptr_to_u64(name);
 777         attr.raw_tracepoint.prog_fd = prog_fd;
 778
 779         return sys_bpf(BPF_RAW_TRACEPOINT_OPEN, &attr, sizeof(attr));
 780 }
 781
 782 int bpf_load_btf(void *btf, __u32 btf_size, char *log_buf, __u32 log_buf_size,
 783                  bool do_log)
 784 {
 785         union bpf_attr attr = {};
 786         int fd;
 787
 788         attr.btf = ptr_to_u64(btf);
 789         attr.btf_size = btf_size;
 790
 791 retry:
 792         if (do_log && log_buf && log_buf_size) {
 793                 attr.btf_log_level = 1;
 794                 attr.btf_log_size = log_buf_size;
 795                 attr.btf_log_buf = ptr_to_u64(log_buf);
 796         }
 797
 798         fd = sys_bpf(BPF_BTF_LOAD, &attr, sizeof(attr));
 799         if (fd == -1 && !do_log && log_buf && log_buf_size) {
 800                 do_log = true;
 801                 goto retry;
 802         }
 803
 804         return fd;
 805 }
 806
 807 int bpf_task_fd_query(int pid, int fd, __u32 flags, char *buf, __u32 *buf_len,
 808                       __u32 *prog_id, __u32 *fd_type, __u64 *probe_offset,
 809                       __u64 *probe_addr)
 810 {
 811         union bpf_attr attr = {};
 812         int err;
 813
 814         attr.task_fd_query.pid = pid;
 815         attr.task_fd_query.fd = fd;
 816         attr.task_fd_query.flags = flags;
 817         attr.task_fd_query.buf = ptr_to_u64(buf);
 818         attr.task_fd_query.buf_len = *buf_len;
 819
 820         err = sys_bpf(BPF_TASK_FD_QUERY, &attr, sizeof(attr));
 821         *buf_len = attr.task_fd_query.buf_len;
 822         *prog_id = attr.task_fd_query.prog_id;
 823         *fd_type = attr.task_fd_query.fd_type;
 824         *probe_offset = attr.task_fd_query.probe_offset;
 825         *probe_addr = attr.task_fd_query.probe_addr;
 826
 827         return err;
 828 }