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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
554ae6e7 DA |
2 | /* eBPF example program: |
3 | * | |
4 | * - Loads eBPF program | |
5 | * | |
6 | * The eBPF program loads a filter from file and attaches the | |
7 | * program to a cgroup using BPF_PROG_ATTACH | |
8 | */ | |
9 | ||
10 | #define _GNU_SOURCE | |
11 | ||
12 | #include <stdio.h> | |
13 | #include <stdlib.h> | |
14 | #include <stddef.h> | |
15 | #include <string.h> | |
16 | #include <unistd.h> | |
17 | #include <assert.h> | |
18 | #include <errno.h> | |
19 | #include <fcntl.h> | |
20 | #include <net/if.h> | |
21 | #include <linux/bpf.h> | |
22 | ||
23 | #include "libbpf.h" | |
24 | #include "bpf_load.h" | |
25 | ||
26 | static int usage(const char *argv0) | |
27 | { | |
28 | printf("Usage: %s cg-path filter-path [filter-id]\n", argv0); | |
29 | return EXIT_FAILURE; | |
30 | } | |
31 | ||
32 | int main(int argc, char **argv) | |
33 | { | |
34 | int cg_fd, ret, filter_id = 0; | |
35 | ||
36 | if (argc < 3) | |
37 | return usage(argv[0]); | |
38 | ||
39 | cg_fd = open(argv[1], O_DIRECTORY | O_RDONLY); | |
40 | if (cg_fd < 0) { | |
41 | printf("Failed to open cgroup path: '%s'\n", strerror(errno)); | |
42 | return EXIT_FAILURE; | |
43 | } | |
44 | ||
45 | if (load_bpf_file(argv[2])) | |
46 | return EXIT_FAILURE; | |
47 | ||
48 | printf("Output from kernel verifier:\n%s\n-------\n", bpf_log_buf); | |
49 | ||
50 | if (argc > 3) | |
51 | filter_id = atoi(argv[3]); | |
52 | ||
53 | if (filter_id > prog_cnt) { | |
54 | printf("Invalid program id; program not found in file\n"); | |
55 | return EXIT_FAILURE; | |
56 | } | |
57 | ||
58 | ret = bpf_prog_attach(prog_fd[filter_id], cg_fd, | |
7f677633 | 59 | BPF_CGROUP_INET_SOCK_CREATE, 0); |
554ae6e7 DA |
60 | if (ret < 0) { |
61 | printf("Failed to attach prog to cgroup: '%s'\n", | |
62 | strerror(errno)); | |
63 | return EXIT_FAILURE; | |
64 | } | |
65 | ||
66 | return EXIT_SUCCESS; | |
67 | } |