Martin KaFai Lau | 90e0289 | 2016-11-09 15:36:34 -0800 | [diff] [blame] | 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 */ |
| 63 | ret = bpf_update_elem(array_fd, &array_key, &ifindex, 0); |
| 64 | if (ret) { |
| 65 | perror("bpf_update_elem"); |
| 66 | goto out; |
| 67 | } |
| 68 | |
| 69 | out: |
| 70 | if (array_fd != -1) |
| 71 | close(array_fd); |
| 72 | return ret; |
| 73 | } |