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25763b3c | 1 | // SPDX-License-Identifier: GPL-2.0-only |
90e02896 | 2 | /* Copyright (c) 2016 Facebook |
90e02896 MKL |
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 | ||
2bf3e2ef | 13 | #include <bpf/bpf.h> |
90e02896 MKL |
14 | |
15 | static void usage(void) | |
16 | { | |
17 | printf("Usage: tc_l2_ipip_redirect [...]\n"); | |
18 | printf(" -U <file> Update an already pinned BPF array\n"); | |
19 | printf(" -i <ifindex> Interface index\n"); | |
20 | printf(" -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, argv, "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(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, "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 */ | |
d40fc181 | 60 | ret = bpf_map_update_elem(array_fd, &array_key, &ifindex, 0); |
90e02896 | 61 | if (ret) { |
d40fc181 | 62 | perror("bpf_map_update_elem"); |
90e02896 MKL |
63 | goto out; |
64 | } | |
65 | ||
66 | out: | |
67 | if (array_fd != -1) | |
68 | close(array_fd); | |
69 | return ret; | |
70 | } |