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// SPDX-License-Identifier: GPL-2.0
#include <linux/bpf.h>
#include <linux/if_link.h>
#include <linux/limits.h>
#include <net/if.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <libgen.h>
#include <bpf/bpf.h>
#include <bpf/libbpf.h>
#include "libbpf_helpers.h"
static void usage(const char *prog)
{
fprintf(stderr,
"usage: %s [OPTS] interface-list\n"
"\nOPTS:\n"
" -d detach program\n"
" -f bpf-file bpf filename to load\n"
" -g skb mode\n"
, prog);
}
int main(int argc, char **argv)
{
int (*attach_fn)(int idx, int prog_fd, const char *dev) = attach_to_dev;
int (*detach_fn)(int idx, const char *dev) = detach_from_dev;
struct bpf_prog_load_attr prog_load_attr = { };
const char *objfile = "xdp_dummy_kern.o";
const char *pname = "xdp_dummy";
bool filename_set = false;
struct bpf_program *prog;
struct bpf_object *obj;
int opt, i, prog_fd;
bool attach = true;
int ret = 0;
while ((opt = getopt(argc, argv, ":df:g")) != -1) {
switch (opt) {
case 'f':
objfile = optarg;
filename_set = true;
break;
case 'd':
attach = false;
break;
case 'g':
attach_fn = attach_to_dev_generic;
detach_fn = detach_from_dev_generic;
break;
default:
usage(basename(argv[0]));
return 1;
}
}
if (optind == argc) {
usage(basename(argv[0]));
return 1;
}
if (!attach) {
for (i = optind; i < argc; ++i) {
int idx, err;
idx = if_nametoindex(argv[i]);
if (!idx)
idx = strtoul(argv[i], NULL, 0);
if (!idx) {
fprintf(stderr, "Invalid device argument\n");
return 1;
}
err = detach_fn(idx, argv[i]);
if (err)
ret = err;
}
return ret;
}
if (load_obj_file(&prog_load_attr, &obj, objfile, filename_set))
return 1;
prog = bpf_object__find_program_by_title(obj, pname);
prog_fd = bpf_program__fd(prog);
if (prog_fd < 0) {
printf("program not found: %s\n", strerror(prog_fd));
return 1;
}
for (i = optind; i < argc; ++i) {
int idx, err;
idx = if_nametoindex(argv[i]);
if (!idx)
idx = strtoul(argv[i], NULL, 0);
if (!idx) {
fprintf(stderr, "Invalid device argument\n");
return 1;
}
err = attach_fn(idx, prog_fd, argv[i]);
if (err)
ret = err;
}
return ret;
}
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