| /* Copyright (c) 2016 Facebook |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of version 2 of the GNU General Public |
| * License as published by the Free Software Foundation. |
| */ |
| #include <linux/unistd.h> |
| #include <linux/bpf.h> |
| |
| #include <stdlib.h> |
| #include <stdio.h> |
| #include <unistd.h> |
| #include <string.h> |
| #include <errno.h> |
| |
| #include <bpf/bpf.h> |
| |
| static void usage(void) |
| { |
| printf("Usage: tc_l2_ipip_redirect [...]\n"); |
| printf(" -U <file> Update an already pinned BPF array\n"); |
| printf(" -i <ifindex> Interface index\n"); |
| printf(" -h Display this help\n"); |
| } |
| |
| int main(int argc, char **argv) |
| { |
| const char *pinned_file = NULL; |
| int ifindex = -1; |
| int array_key = 0; |
| int array_fd = -1; |
| int ret = -1; |
| int opt; |
| |
| while ((opt = getopt(argc, argv, "F:U:i:")) != -1) { |
| switch (opt) { |
| /* General args */ |
| case 'U': |
| pinned_file = optarg; |
| break; |
| case 'i': |
| ifindex = atoi(optarg); |
| break; |
| default: |
| usage(); |
| goto out; |
| } |
| } |
| |
| if (ifindex < 0 || !pinned_file) { |
| usage(); |
| goto out; |
| } |
| |
| array_fd = bpf_obj_get(pinned_file); |
| if (array_fd < 0) { |
| fprintf(stderr, "bpf_obj_get(%s): %s(%d)\n", |
| pinned_file, strerror(errno), errno); |
| goto out; |
| } |
| |
| /* bpf_tunnel_key.remote_ipv4 expects host byte orders */ |
| ret = bpf_map_update_elem(array_fd, &array_key, &ifindex, 0); |
| if (ret) { |
| perror("bpf_map_update_elem"); |
| goto out; |
| } |
| |
| out: |
| if (array_fd != -1) |
| close(array_fd); |
| return ret; |
| } |