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__)
43 # error __NR_bpf not defined. libbpf does not support your arch.
47 static inline __u64 ptr_to_u64(const void *ptr)
49 return (__u64) (unsigned long) ptr;
52 static inline int sys_bpf(enum bpf_cmd cmd, union bpf_attr *attr,
55 return syscall(__NR_bpf, cmd, attr, size);
58 int bpf_create_map(enum bpf_map_type map_type, int key_size,
59 int value_size, int max_entries, __u32 map_flags)
63 memset(&attr, '\0', sizeof(attr));
65 attr.map_type = map_type;
66 attr.key_size = key_size;
67 attr.value_size = value_size;
68 attr.max_entries = max_entries;
69 attr.map_flags = map_flags;
71 return sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr));
74 int bpf_create_map_in_map(enum bpf_map_type map_type, int key_size,
75 int inner_map_fd, int max_entries, __u32 map_flags)
79 memset(&attr, '\0', sizeof(attr));
81 attr.map_type = map_type;
82 attr.key_size = key_size;
84 attr.inner_map_fd = inner_map_fd;
85 attr.max_entries = max_entries;
86 attr.map_flags = map_flags;
88 return sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr));
91 int bpf_load_program(enum bpf_prog_type type, const struct bpf_insn *insns,
92 size_t insns_cnt, const char *license,
93 __u32 kern_version, char *log_buf, size_t log_buf_sz)
98 bzero(&attr, sizeof(attr));
99 attr.prog_type = type;
100 attr.insn_cnt = (__u32)insns_cnt;
101 attr.insns = ptr_to_u64(insns);
102 attr.license = ptr_to_u64(license);
103 attr.log_buf = ptr_to_u64(NULL);
106 attr.kern_version = kern_version;
108 fd = sys_bpf(BPF_PROG_LOAD, &attr, sizeof(attr));
109 if (fd >= 0 || !log_buf || !log_buf_sz)
112 /* Try again with log */
113 attr.log_buf = ptr_to_u64(log_buf);
114 attr.log_size = log_buf_sz;
117 return sys_bpf(BPF_PROG_LOAD, &attr, sizeof(attr));
120 int bpf_map_update_elem(int fd, const void *key, const void *value,
125 bzero(&attr, sizeof(attr));
127 attr.key = ptr_to_u64(key);
128 attr.value = ptr_to_u64(value);
131 return sys_bpf(BPF_MAP_UPDATE_ELEM, &attr, sizeof(attr));
134 int bpf_map_lookup_elem(int fd, const void *key, void *value)
138 bzero(&attr, sizeof(attr));
140 attr.key = ptr_to_u64(key);
141 attr.value = ptr_to_u64(value);
143 return sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr));
146 int bpf_map_delete_elem(int fd, const void *key)
150 bzero(&attr, sizeof(attr));
152 attr.key = ptr_to_u64(key);
154 return sys_bpf(BPF_MAP_DELETE_ELEM, &attr, sizeof(attr));
157 int bpf_map_get_next_key(int fd, const void *key, void *next_key)
161 bzero(&attr, sizeof(attr));
163 attr.key = ptr_to_u64(key);
164 attr.next_key = ptr_to_u64(next_key);
166 return sys_bpf(BPF_MAP_GET_NEXT_KEY, &attr, sizeof(attr));
169 int bpf_obj_pin(int fd, const char *pathname)
173 bzero(&attr, sizeof(attr));
174 attr.pathname = ptr_to_u64((void *)pathname);
177 return sys_bpf(BPF_OBJ_PIN, &attr, sizeof(attr));
180 int bpf_obj_get(const char *pathname)
184 bzero(&attr, sizeof(attr));
185 attr.pathname = ptr_to_u64((void *)pathname);
187 return sys_bpf(BPF_OBJ_GET, &attr, sizeof(attr));
190 int bpf_prog_attach(int prog_fd, int target_fd, enum bpf_attach_type type,
195 bzero(&attr, sizeof(attr));
196 attr.target_fd = target_fd;
197 attr.attach_bpf_fd = prog_fd;
198 attr.attach_type = type;
199 attr.attach_flags = flags;
201 return sys_bpf(BPF_PROG_ATTACH, &attr, sizeof(attr));
204 int bpf_prog_detach(int target_fd, enum bpf_attach_type type)
208 bzero(&attr, sizeof(attr));
209 attr.target_fd = target_fd;
210 attr.attach_type = type;
212 return sys_bpf(BPF_PROG_DETACH, &attr, sizeof(attr));
215 int bpf_prog_test_run(int prog_fd, int repeat, void *data, __u32 size,
216 void *data_out, __u32 *size_out, __u32 *retval,
222 bzero(&attr, sizeof(attr));
223 attr.test.prog_fd = prog_fd;
224 attr.test.data_in = ptr_to_u64(data);
225 attr.test.data_out = ptr_to_u64(data_out);
226 attr.test.data_size_in = size;
227 attr.test.repeat = repeat;
229 ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, sizeof(attr));
231 *size_out = attr.test.data_size_out;
233 *retval = attr.test.retval;
235 *duration = attr.test.duration;