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90e02896 MKL |
1 | /* Copyright (c) 2016 Facebook |
2 | * | |
3 | * This program is free software; you can redistribute it and/or | |
4 | * modify it under the terms of version 2 of the GNU General Public | |
5 | * License as published by the Free Software Foundation. | |
6 | */ | |
7 | #include <linux/unistd.h> | |
8 | #include <linux/bpf.h> | |
9 | ||
10 | #include <stdlib.h> | |
11 | #include <stdio.h> | |
12 | #include <unistd.h> | |
13 | #include <string.h> | |
14 | #include <errno.h> | |
15 | ||
16 | #include "libbpf.h" | |
17 | ||
18 | static void usage(void) | |
19 | { | |
20 | printf("Usage: tc_l2_ipip_redirect [...]\n"); | |
21 | printf(" -U <file> Update an already pinned BPF array\n"); | |
22 | printf(" -i <ifindex> Interface index\n"); | |
23 | printf(" -h Display this help\n"); | |
24 | } | |
25 | ||
26 | int main(int argc, char **argv) | |
27 | { | |
28 | const char *pinned_file = NULL; | |
29 | int ifindex = -1; | |
30 | int array_key = 0; | |
31 | int array_fd = -1; | |
32 | int ret = -1; | |
33 | int opt; | |
34 | ||
35 | while ((opt = getopt(argc, argv, "F:U:i:")) != -1) { | |
36 | switch (opt) { | |
37 | /* General args */ | |
38 | case 'U': | |
39 | pinned_file = optarg; | |
40 | break; | |
41 | case 'i': | |
42 | ifindex = atoi(optarg); | |
43 | break; | |
44 | default: | |
45 | usage(); | |
46 | goto out; | |
47 | } | |
48 | } | |
49 | ||
50 | if (ifindex < 0 || !pinned_file) { | |
51 | usage(); | |
52 | goto out; | |
53 | } | |
54 | ||
55 | array_fd = bpf_obj_get(pinned_file); | |
56 | if (array_fd < 0) { | |
57 | fprintf(stderr, "bpf_obj_get(%s): %s(%d)\n", | |
58 | pinned_file, strerror(errno), errno); | |
59 | goto out; | |
60 | } | |
61 | ||
62 | /* bpf_tunnel_key.remote_ipv4 expects host byte orders */ | |
d40fc181 | 63 | ret = bpf_map_update_elem(array_fd, &array_key, &ifindex, 0); |
90e02896 | 64 | if (ret) { |
d40fc181 | 65 | perror("bpf_map_update_elem"); |
90e02896 MKL |
66 | goto out; |
67 | } | |
68 | ||
69 | out: | |
70 | if (array_fd != -1) | |
71 | close(array_fd); | |
72 | return ret; | |
73 | } |