tools/lib/bpf/bpf.h

   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 #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
  33 #ifdef __cplusplus
  34 extern "C" {
  35 #endif
  36
  37 struct bpf_create_map_attr {
  38         const char *name;
  39         enum bpf_map_type map_type;
  40         __u32 map_flags;
  41         __u32 key_size;
  42         __u32 value_size;
  43         __u32 max_entries;
  44         __u32 numa_node;
  45         __u32 btf_fd;
  46         __u32 btf_key_type_id;
  47         __u32 btf_value_type_id;
  48         __u32 map_ifindex;
  49         union {
  50                 __u32 inner_map_fd;
  51                 __u32 btf_vmlinux_value_type_id;
  52         };
  53 };
  54
  55 LIBBPF_API int
  56 bpf_create_map_xattr(const struct bpf_create_map_attr *create_attr);
  57 LIBBPF_API int bpf_create_map_node(enum bpf_map_type map_type, const char *name,
  58                                    int key_size, int value_size,
  59                                    int max_entries, __u32 map_flags, int node);
  60 LIBBPF_API int bpf_create_map_name(enum bpf_map_type map_type, const char *name,
  61                                    int key_size, int value_size,
  62                                    int max_entries, __u32 map_flags);
  63 LIBBPF_API int bpf_create_map(enum bpf_map_type map_type, int key_size,
  64                               int value_size, int max_entries, __u32 map_flags);
  65 LIBBPF_API int bpf_create_map_in_map_node(enum bpf_map_type map_type,
  66                                           const char *name, int key_size,
  67                                           int inner_map_fd, int max_entries,
  68                                           __u32 map_flags, int node);
  69 LIBBPF_API int bpf_create_map_in_map(enum bpf_map_type map_type,
  70                                      const char *name, int key_size,
  71                                      int inner_map_fd, int max_entries,
  72                                      __u32 map_flags);
  73
  74 struct bpf_load_program_attr {
  75         enum bpf_prog_type prog_type;
  76         enum bpf_attach_type expected_attach_type;
  77         const char *name;
  78         const struct bpf_insn *insns;
  79         size_t insns_cnt;
  80         const char *license;
  81         union {
  82                 __u32 kern_version;
  83                 __u32 attach_prog_fd;
  84         };
  85         union {
  86                 __u32 prog_ifindex;
  87                 __u32 attach_btf_id;
  88         };
  89         __u32 prog_btf_fd;
  90         __u32 func_info_rec_size;
  91         const void *func_info;
  92         __u32 func_info_cnt;
  93         __u32 line_info_rec_size;
  94         const void *line_info;
  95         __u32 line_info_cnt;
  96         __u32 log_level;
  97         __u32 prog_flags;
  98 };
  99
 100 /* Flags to direct loading requirements */
 101 #define MAPS_RELAX_COMPAT       0x01
 102
 103 /* Recommend log buffer size */
 104 #define BPF_LOG_BUF_SIZE (UINT32_MAX >> 8) /* verifier maximum in kernels <= 5.1 */
 105 LIBBPF_API int
 106 bpf_load_program_xattr(const struct bpf_load_program_attr *load_attr,
 107                        char *log_buf, size_t log_buf_sz);
 108 LIBBPF_API int bpf_load_program(enum bpf_prog_type type,
 109                                 const struct bpf_insn *insns, size_t insns_cnt,
 110                                 const char *license, __u32 kern_version,
 111                                 char *log_buf, size_t log_buf_sz);
 112 LIBBPF_API int bpf_verify_program(enum bpf_prog_type type,
 113                                   const struct bpf_insn *insns,
 114                                   size_t insns_cnt, __u32 prog_flags,
 115                                   const char *license, __u32 kern_version,
 116                                   char *log_buf, size_t log_buf_sz,
 117                                   int log_level);
 118
 119 LIBBPF_API int bpf_map_update_elem(int fd, const void *key, const void *value,
 120                                    __u64 flags);
 121
 122 LIBBPF_API int bpf_map_lookup_elem(int fd, const void *key, void *value);
 123 LIBBPF_API int bpf_map_lookup_elem_flags(int fd, const void *key, void *value,
 124                                          __u64 flags);
 125 LIBBPF_API int bpf_map_lookup_and_delete_elem(int fd, const void *key,
 126                                               void *value);
 127 LIBBPF_API int bpf_map_delete_elem(int fd, const void *key);
 128 LIBBPF_API int bpf_map_get_next_key(int fd, const void *key, void *next_key);
 129 LIBBPF_API int bpf_map_freeze(int fd);
 130
 131 struct bpf_map_batch_opts {
 132         size_t sz; /* size of this struct for forward/backward compatibility */
 133         __u64 elem_flags;
 134         __u64 flags;
 135 };
 136 #define bpf_map_batch_opts__last_field flags
 137
 138 LIBBPF_API int bpf_map_delete_batch(int fd, void *keys,
 139                                     __u32 *count,
 140                                     const struct bpf_map_batch_opts *opts);
 141 LIBBPF_API int bpf_map_lookup_batch(int fd, void *in_batch, void *out_batch,
 142                                     void *keys, void *values, __u32 *count,
 143                                     const struct bpf_map_batch_opts *opts);
 144 LIBBPF_API int bpf_map_lookup_and_delete_batch(int fd, void *in_batch,
 145                                         void *out_batch, void *keys,
 146                                         void *values, __u32 *count,
 147                                         const struct bpf_map_batch_opts *opts);
 148 LIBBPF_API int bpf_map_update_batch(int fd, void *keys, void *values,
 149                                     __u32 *count,
 150                                     const struct bpf_map_batch_opts *opts);
 151
 152 LIBBPF_API int bpf_obj_pin(int fd, const char *pathname);
 153 LIBBPF_API int bpf_obj_get(const char *pathname);
 154
 155 struct bpf_prog_attach_opts {
 156         size_t sz; /* size of this struct for forward/backward compatibility */
 157         unsigned int flags;
 158         int replace_prog_fd;
 159 };
 160 #define bpf_prog_attach_opts__last_field replace_prog_fd
 161
 162 LIBBPF_API int bpf_prog_attach(int prog_fd, int attachable_fd,
 163                                enum bpf_attach_type type, unsigned int flags);
 164 LIBBPF_API int bpf_prog_attach_xattr(int prog_fd, int attachable_fd,
 165                                      enum bpf_attach_type type,
 166                                      const struct bpf_prog_attach_opts *opts);
 167 LIBBPF_API int bpf_prog_detach(int attachable_fd, enum bpf_attach_type type);
 168 LIBBPF_API int bpf_prog_detach2(int prog_fd, int attachable_fd,
 169                                 enum bpf_attach_type type);
 170
 171 struct bpf_link_create_opts {
 172         size_t sz; /* size of this struct for forward/backward compatibility */
 173 };
 174 #define bpf_link_create_opts__last_field sz
 175
 176 LIBBPF_API int bpf_link_create(int prog_fd, int target_fd,
 177                                enum bpf_attach_type attach_type,
 178                                const struct bpf_link_create_opts *opts);
 179
 180 struct bpf_link_update_opts {
 181         size_t sz; /* size of this struct for forward/backward compatibility */
 182         __u32 flags;       /* extra flags */
 183         __u32 old_prog_fd; /* expected old program FD */
 184 };
 185 #define bpf_link_update_opts__last_field old_prog_fd
 186
 187 LIBBPF_API int bpf_link_update(int link_fd, int new_prog_fd,
 188                                const struct bpf_link_update_opts *opts);
 189
 190 struct bpf_prog_test_run_attr {
 191         int prog_fd;
 192         int repeat;
 193         const void *data_in;
 194         __u32 data_size_in;
 195         void *data_out;      /* optional */
 196         __u32 data_size_out; /* in: max length of data_out
 197                               * out: length of data_out */
 198         __u32 retval;        /* out: return code of the BPF program */
 199         __u32 duration;      /* out: average per repetition in ns */
 200         const void *ctx_in; /* optional */
 201         __u32 ctx_size_in;
 202         void *ctx_out;      /* optional */
 203         __u32 ctx_size_out; /* in: max length of ctx_out
 204                              * out: length of cxt_out */
 205 };
 206
 207 LIBBPF_API int bpf_prog_test_run_xattr(struct bpf_prog_test_run_attr *test_attr);
 208
 209 /*
 210  * bpf_prog_test_run does not check that data_out is large enough. Consider
 211  * using bpf_prog_test_run_xattr instead.
 212  */
 213 LIBBPF_API int bpf_prog_test_run(int prog_fd, int repeat, void *data,
 214                                  __u32 size, void *data_out, __u32 *size_out,
 215                                  __u32 *retval, __u32 *duration);
 216 LIBBPF_API int bpf_prog_get_next_id(__u32 start_id, __u32 *next_id);
 217 LIBBPF_API int bpf_map_get_next_id(__u32 start_id, __u32 *next_id);
 218 LIBBPF_API int bpf_btf_get_next_id(__u32 start_id, __u32 *next_id);
 219 LIBBPF_API int bpf_prog_get_fd_by_id(__u32 id);
 220 LIBBPF_API int bpf_map_get_fd_by_id(__u32 id);
 221 LIBBPF_API int bpf_btf_get_fd_by_id(__u32 id);
 222 LIBBPF_API int bpf_obj_get_info_by_fd(int prog_fd, void *info, __u32 *info_len);
 223 LIBBPF_API int bpf_prog_query(int target_fd, enum bpf_attach_type type,
 224                               __u32 query_flags, __u32 *attach_flags,
 225                               __u32 *prog_ids, __u32 *prog_cnt);
 226 LIBBPF_API int bpf_raw_tracepoint_open(const char *name, int prog_fd);
 227 LIBBPF_API int bpf_load_btf(void *btf, __u32 btf_size, char *log_buf,
 228                             __u32 log_buf_size, bool do_log);
 229 LIBBPF_API int bpf_task_fd_query(int pid, int fd, __u32 flags, char *buf,
 230                                  __u32 *buf_len, __u32 *prog_id, __u32 *fd_type,
 231                                  __u64 *probe_offset, __u64 *probe_addr);
 232
 233 #ifdef __cplusplus
 234 } /* extern "C" */
 235 #endif
 236
 237 #endif /* __LIBBPF_BPF_H */