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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 | /* | |
8f9e05fb WN |
30 | * When building perf, unistd.h is overrided. __NR_bpf is |
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 | |
40 | # else | |
41 | # error __NR_bpf not defined. libbpf does not support your arch. | |
42 | # endif | |
43 | #endif | |
44 | ||
7bf98369 WN |
45 | static __u64 ptr_to_u64(void *ptr) |
46 | { | |
47 | return (__u64) (unsigned long) ptr; | |
48 | } | |
49 | ||
e3ed2fef WN |
50 | static int sys_bpf(enum bpf_cmd cmd, union bpf_attr *attr, |
51 | unsigned int size) | |
52 | { | |
53 | return syscall(__NR_bpf, cmd, attr, size); | |
54 | } | |
55 | ||
56 | int bpf_create_map(enum bpf_map_type map_type, int key_size, | |
57 | int value_size, int max_entries) | |
58 | { | |
59 | union bpf_attr attr; | |
60 | ||
61 | memset(&attr, '\0', sizeof(attr)); | |
62 | ||
63 | attr.map_type = map_type; | |
64 | attr.key_size = key_size; | |
65 | attr.value_size = value_size; | |
66 | attr.max_entries = max_entries; | |
67 | ||
68 | return sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr)); | |
69 | } | |
7bf98369 WN |
70 | |
71 | int bpf_load_program(enum bpf_prog_type type, struct bpf_insn *insns, | |
72 | size_t insns_cnt, char *license, | |
73 | u32 kern_version, char *log_buf, size_t log_buf_sz) | |
74 | { | |
75 | int fd; | |
76 | union bpf_attr attr; | |
77 | ||
78 | bzero(&attr, sizeof(attr)); | |
79 | attr.prog_type = type; | |
80 | attr.insn_cnt = (__u32)insns_cnt; | |
81 | attr.insns = ptr_to_u64(insns); | |
82 | attr.license = ptr_to_u64(license); | |
83 | attr.log_buf = ptr_to_u64(NULL); | |
84 | attr.log_size = 0; | |
85 | attr.log_level = 0; | |
86 | attr.kern_version = kern_version; | |
87 | ||
88 | fd = sys_bpf(BPF_PROG_LOAD, &attr, sizeof(attr)); | |
89 | if (fd >= 0 || !log_buf || !log_buf_sz) | |
90 | return fd; | |
91 | ||
92 | /* Try again with log */ | |
93 | attr.log_buf = ptr_to_u64(log_buf); | |
94 | attr.log_size = log_buf_sz; | |
95 | attr.log_level = 1; | |
96 | log_buf[0] = 0; | |
97 | return sys_bpf(BPF_PROG_LOAD, &attr, sizeof(attr)); | |
98 | } | |
43798bf3 HK |
99 | |
100 | int bpf_map_update_elem(int fd, void *key, void *value, | |
101 | u64 flags) | |
102 | { | |
103 | union bpf_attr attr; | |
104 | ||
105 | bzero(&attr, sizeof(attr)); | |
106 | attr.map_fd = fd; | |
107 | attr.key = ptr_to_u64(key); | |
108 | attr.value = ptr_to_u64(value); | |
109 | attr.flags = flags; | |
110 | ||
111 | return sys_bpf(BPF_MAP_UPDATE_ELEM, &attr, sizeof(attr)); | |
112 | } |