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Commit | Line | Data |
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e3ed2fef WN |
1 | /* |
2 | * common eBPF ELF operations. | |
3 | * | |
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. | |
203d1cac WN |
7 | * |
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!) | |
12 | * | |
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. | |
17 | * | |
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> | |
e3ed2fef WN |
20 | */ |
21 | ||
22 | #include <stdlib.h> | |
23 | #include <memory.h> | |
24 | #include <unistd.h> | |
25 | #include <asm/unistd.h> | |
26 | #include <linux/bpf.h> | |
27 | #include "bpf.h" | |
28 | ||
29 | /* | |
03671057 | 30 | * When building perf, unistd.h is overridden. __NR_bpf is |
8f9e05fb | 31 | * required to be defined explicitly. |
e3ed2fef WN |
32 | */ |
33 | #ifndef __NR_bpf | |
34 | # if defined(__i386__) | |
35 | # define __NR_bpf 357 | |
36 | # elif defined(__x86_64__) | |
37 | # define __NR_bpf 321 | |
38 | # elif defined(__aarch64__) | |
39 | # define __NR_bpf 280 | |
b0c47807 DM |
40 | # elif defined(__sparc__) |
41 | # define __NR_bpf 349 | |
e3ed2fef WN |
42 | # else |
43 | # error __NR_bpf not defined. libbpf does not support your arch. | |
44 | # endif | |
45 | #endif | |
46 | ||
cdc6a4ba | 47 | static inline __u64 ptr_to_u64(const void *ptr) |
7bf98369 WN |
48 | { |
49 | return (__u64) (unsigned long) ptr; | |
50 | } | |
51 | ||
cdc6a4ba MS |
52 | static inline int sys_bpf(enum bpf_cmd cmd, union bpf_attr *attr, |
53 | unsigned int size) | |
e3ed2fef WN |
54 | { |
55 | return syscall(__NR_bpf, cmd, attr, size); | |
56 | } | |
57 | ||
58 | int bpf_create_map(enum bpf_map_type map_type, int key_size, | |
a5580c7f | 59 | int value_size, int max_entries, __u32 map_flags) |
e3ed2fef WN |
60 | { |
61 | union bpf_attr attr; | |
62 | ||
63 | memset(&attr, '\0', sizeof(attr)); | |
64 | ||
65 | attr.map_type = map_type; | |
66 | attr.key_size = key_size; | |
67 | attr.value_size = value_size; | |
68 | attr.max_entries = max_entries; | |
a5580c7f | 69 | attr.map_flags = map_flags; |
e3ed2fef WN |
70 | |
71 | return sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr)); | |
72 | } | |
7bf98369 | 73 | |
fb30d4b7 MKL |
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) | |
76 | { | |
77 | union bpf_attr attr; | |
78 | ||
79 | memset(&attr, '\0', sizeof(attr)); | |
80 | ||
81 | attr.map_type = map_type; | |
82 | attr.key_size = key_size; | |
83 | attr.value_size = 4; | |
84 | attr.inner_map_fd = inner_map_fd; | |
85 | attr.max_entries = max_entries; | |
86 | attr.map_flags = map_flags; | |
87 | ||
88 | return sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr)); | |
89 | } | |
90 | ||
2ee89fb9 MS |
91 | int bpf_load_program(enum bpf_prog_type type, const struct bpf_insn *insns, |
92 | size_t insns_cnt, const char *license, | |
83d994d0 | 93 | __u32 kern_version, char *log_buf, size_t log_buf_sz) |
7bf98369 WN |
94 | { |
95 | int fd; | |
96 | union bpf_attr attr; | |
97 | ||
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); | |
104 | attr.log_size = 0; | |
105 | attr.log_level = 0; | |
106 | attr.kern_version = kern_version; | |
107 | ||
108 | fd = sys_bpf(BPF_PROG_LOAD, &attr, sizeof(attr)); | |
109 | if (fd >= 0 || !log_buf || !log_buf_sz) | |
110 | return fd; | |
111 | ||
112 | /* Try again with log */ | |
113 | attr.log_buf = ptr_to_u64(log_buf); | |
114 | attr.log_size = log_buf_sz; | |
115 | attr.log_level = 1; | |
116 | log_buf[0] = 0; | |
117 | return sys_bpf(BPF_PROG_LOAD, &attr, sizeof(attr)); | |
118 | } | |
43798bf3 | 119 | |
10ecc728 | 120 | int bpf_map_update_elem(int fd, const void *key, const void *value, |
83d994d0 | 121 | __u64 flags) |
43798bf3 HK |
122 | { |
123 | union bpf_attr attr; | |
124 | ||
125 | bzero(&attr, sizeof(attr)); | |
126 | attr.map_fd = fd; | |
127 | attr.key = ptr_to_u64(key); | |
128 | attr.value = ptr_to_u64(value); | |
129 | attr.flags = flags; | |
130 | ||
131 | return sys_bpf(BPF_MAP_UPDATE_ELEM, &attr, sizeof(attr)); | |
132 | } | |
9742da01 | 133 | |
e5ff7c40 | 134 | int bpf_map_lookup_elem(int fd, const void *key, void *value) |
9742da01 WN |
135 | { |
136 | union bpf_attr attr; | |
137 | ||
138 | bzero(&attr, sizeof(attr)); | |
139 | attr.map_fd = fd; | |
140 | attr.key = ptr_to_u64(key); | |
141 | attr.value = ptr_to_u64(value); | |
142 | ||
143 | return sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr)); | |
144 | } | |
145 | ||
e58383b8 | 146 | int bpf_map_delete_elem(int fd, const void *key) |
9742da01 WN |
147 | { |
148 | union bpf_attr attr; | |
149 | ||
150 | bzero(&attr, sizeof(attr)); | |
151 | attr.map_fd = fd; | |
152 | attr.key = ptr_to_u64(key); | |
153 | ||
154 | return sys_bpf(BPF_MAP_DELETE_ELEM, &attr, sizeof(attr)); | |
155 | } | |
156 | ||
5f155c25 | 157 | int bpf_map_get_next_key(int fd, const void *key, void *next_key) |
9742da01 WN |
158 | { |
159 | union bpf_attr attr; | |
160 | ||
161 | bzero(&attr, sizeof(attr)); | |
162 | attr.map_fd = fd; | |
163 | attr.key = ptr_to_u64(key); | |
164 | attr.next_key = ptr_to_u64(next_key); | |
165 | ||
166 | return sys_bpf(BPF_MAP_GET_NEXT_KEY, &attr, sizeof(attr)); | |
167 | } | |
168 | ||
169 | int bpf_obj_pin(int fd, const char *pathname) | |
170 | { | |
171 | union bpf_attr attr; | |
172 | ||
173 | bzero(&attr, sizeof(attr)); | |
174 | attr.pathname = ptr_to_u64((void *)pathname); | |
175 | attr.bpf_fd = fd; | |
176 | ||
177 | return sys_bpf(BPF_OBJ_PIN, &attr, sizeof(attr)); | |
178 | } | |
179 | ||
180 | int bpf_obj_get(const char *pathname) | |
181 | { | |
182 | union bpf_attr attr; | |
183 | ||
184 | bzero(&attr, sizeof(attr)); | |
185 | attr.pathname = ptr_to_u64((void *)pathname); | |
186 | ||
187 | return sys_bpf(BPF_OBJ_GET, &attr, sizeof(attr)); | |
188 | } | |
5dc880de | 189 | |
7f677633 AS |
190 | int bpf_prog_attach(int prog_fd, int target_fd, enum bpf_attach_type type, |
191 | unsigned int flags) | |
5dc880de JS |
192 | { |
193 | union bpf_attr attr; | |
194 | ||
195 | bzero(&attr, sizeof(attr)); | |
196 | attr.target_fd = target_fd; | |
197 | attr.attach_bpf_fd = prog_fd; | |
198 | attr.attach_type = type; | |
7f677633 | 199 | attr.attach_flags = flags; |
5dc880de JS |
200 | |
201 | return sys_bpf(BPF_PROG_ATTACH, &attr, sizeof(attr)); | |
202 | } | |
203 | ||
204 | int bpf_prog_detach(int target_fd, enum bpf_attach_type type) | |
205 | { | |
206 | union bpf_attr attr; | |
207 | ||
208 | bzero(&attr, sizeof(attr)); | |
209 | attr.target_fd = target_fd; | |
210 | attr.attach_type = type; | |
211 | ||
212 | return sys_bpf(BPF_PROG_DETACH, &attr, sizeof(attr)); | |
213 | } | |
30848873 AS |
214 | |
215 | int bpf_prog_test_run(int prog_fd, int repeat, void *data, __u32 size, | |
216 | void *data_out, __u32 *size_out, __u32 *retval, | |
217 | __u32 *duration) | |
218 | { | |
219 | union bpf_attr attr; | |
220 | int ret; | |
221 | ||
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; | |
228 | ||
229 | ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, sizeof(attr)); | |
230 | if (size_out) | |
231 | *size_out = attr.test.data_size_out; | |
232 | if (retval) | |
233 | *retval = attr.test.retval; | |
234 | if (duration) | |
235 | *duration = attr.test.duration; | |
236 | return ret; | |
237 | } |