// SPDX-License-Identifier: GPL-2.0-only
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/* Copyright (c) 2016 Facebook
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*/
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#include <linux/unistd.h>
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#include <linux/bpf.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <bpf/bpf.h>
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static void usage(void)
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{
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printf("Usage: tc_l2_ipip_redirect [...]\n");
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printf(" -U <file> Update an already pinned BPF array\n");
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printf(" -i <ifindex> Interface index\n");
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printf(" -h Display this help\n");
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}
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int main(int argc, char **argv)
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{
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const char *pinned_file = NULL;
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int ifindex = -1;
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int array_key = 0;
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int array_fd = -1;
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int ret = -1;
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int opt;
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while ((opt = getopt(argc, argv, "F:U:i:")) != -1) {
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switch (opt) {
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/* General args */
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case 'U':
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pinned_file = optarg;
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break;
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case 'i':
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ifindex = atoi(optarg);
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break;
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default:
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usage();
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goto out;
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}
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}
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if (ifindex < 0 || !pinned_file) {
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usage();
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goto out;
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}
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array_fd = bpf_obj_get(pinned_file);
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if (array_fd < 0) {
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fprintf(stderr, "bpf_obj_get(%s): %s(%d)\n",
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pinned_file, strerror(errno), errno);
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goto out;
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}
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/* bpf_tunnel_key.remote_ipv4 expects host byte orders */
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ret = bpf_map_update_elem(array_fd, &array_key, &ifindex, 0);
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if (ret) {
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perror("bpf_map_update_elem");
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goto out;
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}
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out:
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if (array_fd != -1)
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close(array_fd);
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return ret;
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}
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