]>
git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/blob - tools/lib/bpf/bpf.c
2 * common eBPF ELF operations.
4 * Copyright (C) 2013-2015 Alexei Starovoitov <ast@kernel.org>
5 * Copyright (C) 2015 Wang Nan <wangnan0@huawei.com>
6 * Copyright (C) 2015 Huawei Inc.
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation;
11 * version 2.1 of the License (not later!)
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with this program; if not, see <http://www.gnu.org/licenses>
25 #include <asm/unistd.h>
26 #include <linux/bpf.h>
30 * When building perf, unistd.h is overridden. __NR_bpf is
31 * required to be defined explicitly.
34 # if defined(__i386__)
36 # elif defined(__x86_64__)
38 # elif defined(__aarch64__)
40 # elif defined(__sparc__)
42 # elif defined(__s390__)
45 # error __NR_bpf not defined. libbpf does not support your arch.
49 static inline __u64
ptr_to_u64(const void *ptr
)
51 return (__u64
) (unsigned long) ptr
;
54 static inline int sys_bpf(enum bpf_cmd cmd
, union bpf_attr
*attr
,
57 return syscall(__NR_bpf
, cmd
, attr
, size
);
60 int bpf_create_map(enum bpf_map_type map_type
, int key_size
,
61 int value_size
, int max_entries
, __u32 map_flags
)
65 memset(&attr
, '\0', sizeof(attr
));
67 attr
.map_type
= map_type
;
68 attr
.key_size
= key_size
;
69 attr
.value_size
= value_size
;
70 attr
.max_entries
= max_entries
;
71 attr
.map_flags
= map_flags
;
73 return sys_bpf(BPF_MAP_CREATE
, &attr
, sizeof(attr
));
76 int bpf_create_map_in_map(enum bpf_map_type map_type
, int key_size
,
77 int inner_map_fd
, int max_entries
, __u32 map_flags
)
81 memset(&attr
, '\0', sizeof(attr
));
83 attr
.map_type
= map_type
;
84 attr
.key_size
= key_size
;
86 attr
.inner_map_fd
= inner_map_fd
;
87 attr
.max_entries
= max_entries
;
88 attr
.map_flags
= map_flags
;
90 return sys_bpf(BPF_MAP_CREATE
, &attr
, sizeof(attr
));
93 int bpf_load_program(enum bpf_prog_type type
, const struct bpf_insn
*insns
,
94 size_t insns_cnt
, const char *license
,
95 __u32 kern_version
, char *log_buf
, size_t log_buf_sz
)
100 bzero(&attr
, sizeof(attr
));
101 attr
.prog_type
= type
;
102 attr
.insn_cnt
= (__u32
)insns_cnt
;
103 attr
.insns
= ptr_to_u64(insns
);
104 attr
.license
= ptr_to_u64(license
);
105 attr
.log_buf
= ptr_to_u64(NULL
);
108 attr
.kern_version
= kern_version
;
110 fd
= sys_bpf(BPF_PROG_LOAD
, &attr
, sizeof(attr
));
111 if (fd
>= 0 || !log_buf
|| !log_buf_sz
)
114 /* Try again with log */
115 attr
.log_buf
= ptr_to_u64(log_buf
);
116 attr
.log_size
= log_buf_sz
;
119 return sys_bpf(BPF_PROG_LOAD
, &attr
, sizeof(attr
));
122 int bpf_verify_program(enum bpf_prog_type type
, const struct bpf_insn
*insns
,
123 size_t insns_cnt
, int strict_alignment
,
124 const char *license
, __u32 kern_version
,
125 char *log_buf
, size_t log_buf_sz
, int log_level
)
129 bzero(&attr
, sizeof(attr
));
130 attr
.prog_type
= type
;
131 attr
.insn_cnt
= (__u32
)insns_cnt
;
132 attr
.insns
= ptr_to_u64(insns
);
133 attr
.license
= ptr_to_u64(license
);
134 attr
.log_buf
= ptr_to_u64(log_buf
);
135 attr
.log_size
= log_buf_sz
;
136 attr
.log_level
= log_level
;
138 attr
.kern_version
= kern_version
;
139 attr
.prog_flags
= strict_alignment
? BPF_F_STRICT_ALIGNMENT
: 0;
141 return sys_bpf(BPF_PROG_LOAD
, &attr
, sizeof(attr
));
144 int bpf_map_update_elem(int fd
, const void *key
, const void *value
,
149 bzero(&attr
, sizeof(attr
));
151 attr
.key
= ptr_to_u64(key
);
152 attr
.value
= ptr_to_u64(value
);
155 return sys_bpf(BPF_MAP_UPDATE_ELEM
, &attr
, sizeof(attr
));
158 int bpf_map_lookup_elem(int fd
, const void *key
, void *value
)
162 bzero(&attr
, sizeof(attr
));
164 attr
.key
= ptr_to_u64(key
);
165 attr
.value
= ptr_to_u64(value
);
167 return sys_bpf(BPF_MAP_LOOKUP_ELEM
, &attr
, sizeof(attr
));
170 int bpf_map_delete_elem(int fd
, const void *key
)
174 bzero(&attr
, sizeof(attr
));
176 attr
.key
= ptr_to_u64(key
);
178 return sys_bpf(BPF_MAP_DELETE_ELEM
, &attr
, sizeof(attr
));
181 int bpf_map_get_next_key(int fd
, const void *key
, void *next_key
)
185 bzero(&attr
, sizeof(attr
));
187 attr
.key
= ptr_to_u64(key
);
188 attr
.next_key
= ptr_to_u64(next_key
);
190 return sys_bpf(BPF_MAP_GET_NEXT_KEY
, &attr
, sizeof(attr
));
193 int bpf_obj_pin(int fd
, const char *pathname
)
197 bzero(&attr
, sizeof(attr
));
198 attr
.pathname
= ptr_to_u64((void *)pathname
);
201 return sys_bpf(BPF_OBJ_PIN
, &attr
, sizeof(attr
));
204 int bpf_obj_get(const char *pathname
)
208 bzero(&attr
, sizeof(attr
));
209 attr
.pathname
= ptr_to_u64((void *)pathname
);
211 return sys_bpf(BPF_OBJ_GET
, &attr
, sizeof(attr
));
214 int bpf_prog_attach(int prog_fd
, int target_fd
, enum bpf_attach_type type
,
219 bzero(&attr
, sizeof(attr
));
220 attr
.target_fd
= target_fd
;
221 attr
.attach_bpf_fd
= prog_fd
;
222 attr
.attach_type
= type
;
223 attr
.attach_flags
= flags
;
225 return sys_bpf(BPF_PROG_ATTACH
, &attr
, sizeof(attr
));
228 int bpf_prog_detach(int target_fd
, enum bpf_attach_type type
)
232 bzero(&attr
, sizeof(attr
));
233 attr
.target_fd
= target_fd
;
234 attr
.attach_type
= type
;
236 return sys_bpf(BPF_PROG_DETACH
, &attr
, sizeof(attr
));
239 int bpf_prog_test_run(int prog_fd
, int repeat
, void *data
, __u32 size
,
240 void *data_out
, __u32
*size_out
, __u32
*retval
,
246 bzero(&attr
, sizeof(attr
));
247 attr
.test
.prog_fd
= prog_fd
;
248 attr
.test
.data_in
= ptr_to_u64(data
);
249 attr
.test
.data_out
= ptr_to_u64(data_out
);
250 attr
.test
.data_size_in
= size
;
251 attr
.test
.repeat
= repeat
;
253 ret
= sys_bpf(BPF_PROG_TEST_RUN
, &attr
, sizeof(attr
));
255 *size_out
= attr
.test
.data_size_out
;
257 *retval
= attr
.test
.retval
;
259 *duration
= attr
.test
.duration
;
263 int bpf_prog_get_next_id(__u32 start_id
, __u32
*next_id
)
268 bzero(&attr
, sizeof(attr
));
269 attr
.start_id
= start_id
;
271 err
= sys_bpf(BPF_PROG_GET_NEXT_ID
, &attr
, sizeof(attr
));
273 *next_id
= attr
.next_id
;
278 int bpf_map_get_next_id(__u32 start_id
, __u32
*next_id
)
283 bzero(&attr
, sizeof(attr
));
284 attr
.start_id
= start_id
;
286 err
= sys_bpf(BPF_MAP_GET_NEXT_ID
, &attr
, sizeof(attr
));
288 *next_id
= attr
.next_id
;
293 int bpf_prog_get_fd_by_id(__u32 id
)
297 bzero(&attr
, sizeof(attr
));
300 return sys_bpf(BPF_PROG_GET_FD_BY_ID
, &attr
, sizeof(attr
));
303 int bpf_map_get_fd_by_id(__u32 id
)
307 bzero(&attr
, sizeof(attr
));
310 return sys_bpf(BPF_MAP_GET_FD_BY_ID
, &attr
, sizeof(attr
));
313 int bpf_obj_get_info_by_fd(int prog_fd
, void *info
, __u32
*info_len
)
318 bzero(&attr
, sizeof(attr
));
319 attr
.info
.bpf_fd
= prog_fd
;
320 attr
.info
.info_len
= *info_len
;
321 attr
.info
.info
= ptr_to_u64(info
);
323 err
= sys_bpf(BPF_OBJ_GET_INFO_BY_FD
, &attr
, sizeof(attr
));
325 *info_len
= attr
.info
.info_len
;