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;