Commit | Line | Data |
---|---|---|
3c731eba AS |
1 | /* eBPF mini library */ |
2 | #include <stdlib.h> | |
3 | #include <stdio.h> | |
4 | #include <linux/unistd.h> | |
5 | #include <unistd.h> | |
6 | #include <string.h> | |
7 | #include <linux/netlink.h> | |
8 | #include <linux/bpf.h> | |
9 | #include <errno.h> | |
10 | #include "libbpf.h" | |
11 | ||
12 | static __u64 ptr_to_u64(void *ptr) | |
13 | { | |
14 | return (__u64) (unsigned long) ptr; | |
15 | } | |
16 | ||
17 | int bpf_create_map(enum bpf_map_type map_type, int key_size, int value_size, | |
18 | int max_entries) | |
19 | { | |
20 | union bpf_attr attr = { | |
21 | .map_type = map_type, | |
22 | .key_size = key_size, | |
23 | .value_size = value_size, | |
24 | .max_entries = max_entries | |
25 | }; | |
26 | ||
27 | return syscall(__NR_bpf, BPF_MAP_CREATE, &attr, sizeof(attr)); | |
28 | } | |
29 | ||
30 | int bpf_update_elem(int fd, void *key, void *value) | |
31 | { | |
32 | union bpf_attr attr = { | |
33 | .map_fd = fd, | |
34 | .key = ptr_to_u64(key), | |
35 | .value = ptr_to_u64(value), | |
36 | }; | |
37 | ||
38 | return syscall(__NR_bpf, BPF_MAP_UPDATE_ELEM, &attr, sizeof(attr)); | |
39 | } | |
40 | ||
41 | int bpf_lookup_elem(int fd, void *key, void *value) | |
42 | { | |
43 | union bpf_attr attr = { | |
44 | .map_fd = fd, | |
45 | .key = ptr_to_u64(key), | |
46 | .value = ptr_to_u64(value), | |
47 | }; | |
48 | ||
49 | return syscall(__NR_bpf, BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr)); | |
50 | } | |
51 | ||
52 | int bpf_delete_elem(int fd, void *key) | |
53 | { | |
54 | union bpf_attr attr = { | |
55 | .map_fd = fd, | |
56 | .key = ptr_to_u64(key), | |
57 | }; | |
58 | ||
59 | return syscall(__NR_bpf, BPF_MAP_DELETE_ELEM, &attr, sizeof(attr)); | |
60 | } | |
61 | ||
62 | int bpf_get_next_key(int fd, void *key, void *next_key) | |
63 | { | |
64 | union bpf_attr attr = { | |
65 | .map_fd = fd, | |
66 | .key = ptr_to_u64(key), | |
67 | .next_key = ptr_to_u64(next_key), | |
68 | }; | |
69 | ||
70 | return syscall(__NR_bpf, BPF_MAP_GET_NEXT_KEY, &attr, sizeof(attr)); | |
71 | } | |
72 | ||
73 | #define ROUND_UP(x, n) (((x) + (n) - 1u) & ~((n) - 1u)) | |
74 | ||
75 | char bpf_log_buf[LOG_BUF_SIZE]; | |
76 | ||
77 | int bpf_prog_load(enum bpf_prog_type prog_type, | |
78 | const struct bpf_insn *insns, int prog_len, | |
79 | const char *license) | |
80 | { | |
81 | union bpf_attr attr = { | |
82 | .prog_type = prog_type, | |
83 | .insns = ptr_to_u64((void *) insns), | |
84 | .insn_cnt = prog_len / sizeof(struct bpf_insn), | |
85 | .license = ptr_to_u64((void *) license), | |
86 | .log_buf = ptr_to_u64(bpf_log_buf), | |
87 | .log_size = LOG_BUF_SIZE, | |
88 | .log_level = 1, | |
89 | }; | |
90 | ||
91 | bpf_log_buf[0] = 0; | |
92 | ||
93 | return syscall(__NR_bpf, BPF_PROG_LOAD, &attr, sizeof(attr)); | |
94 | } |