1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* Copyright (c) 2016 Facebook |
3 | */ |
4 | #include <linux/unistd.h> |
5 | #include <linux/bpf.h> |
6 | |
7 | #include <stdlib.h> |
8 | #include <stdio.h> |
9 | #include <unistd.h> |
10 | #include <string.h> |
11 | #include <errno.h> |
12 | |
13 | #include <bpf/bpf.h> |
14 | |
15 | static void usage(void) |
16 | { |
17 | printf(format: "Usage: tc_l2_ipip_redirect [...]\n" ); |
18 | printf(format: " -U <file> Update an already pinned BPF array\n" ); |
19 | printf(format: " -i <ifindex> Interface index\n" ); |
20 | printf(format: " -h Display this help\n" ); |
21 | } |
22 | |
23 | int main(int argc, char **argv) |
24 | { |
25 | const char *pinned_file = NULL; |
26 | int ifindex = -1; |
27 | int array_key = 0; |
28 | int array_fd = -1; |
29 | int ret = -1; |
30 | int opt; |
31 | |
32 | while ((opt = getopt(argc: argc, argv: argv, shortopts: "F:U:i:" )) != -1) { |
33 | switch (opt) { |
34 | /* General args */ |
35 | case 'U': |
36 | pinned_file = optarg; |
37 | break; |
38 | case 'i': |
39 | ifindex = atoi(nptr: optarg); |
40 | break; |
41 | default: |
42 | usage(); |
43 | goto out; |
44 | } |
45 | } |
46 | |
47 | if (ifindex < 0 || !pinned_file) { |
48 | usage(); |
49 | goto out; |
50 | } |
51 | |
52 | array_fd = bpf_obj_get(pinned_file); |
53 | if (array_fd < 0) { |
54 | fprintf(stderr, format: "bpf_obj_get(%s): %s(%d)\n" , |
55 | pinned_file, strerror(errno), errno); |
56 | goto out; |
57 | } |
58 | |
59 | /* bpf_tunnel_key.remote_ipv4 expects host byte orders */ |
60 | ret = bpf_map_update_elem(array_fd, &array_key, &ifindex, 0); |
61 | if (ret) { |
62 | perror(s: "bpf_map_update_elem" ); |
63 | goto out; |
64 | } |
65 | |
66 | out: |
67 | if (array_fd != -1) |
68 | close(fd: array_fd); |
69 | return ret; |
70 | } |
71 | |