mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 19:00:25 +00:00
![Dan Carpenter](/assets/img/avatar_default.png)
"prog_cnt" is the number of elements which are filled out in prog_fd[] so the test should be >= instead of >. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Reviewed-by: David Ahern <dsahern@gmail.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
68 lines
1.4 KiB
C
68 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/* eBPF example program:
|
|
*
|
|
* - Loads eBPF program
|
|
*
|
|
* The eBPF program loads a filter from file and attaches the
|
|
* program to a cgroup using BPF_PROG_ATTACH
|
|
*/
|
|
|
|
#define _GNU_SOURCE
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <stddef.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <assert.h>
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <net/if.h>
|
|
#include <linux/bpf.h>
|
|
#include <bpf/bpf.h>
|
|
|
|
#include "bpf_insn.h"
|
|
#include "bpf_load.h"
|
|
|
|
static int usage(const char *argv0)
|
|
{
|
|
printf("Usage: %s cg-path filter-path [filter-id]\n", argv0);
|
|
return EXIT_FAILURE;
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
int cg_fd, ret, filter_id = 0;
|
|
|
|
if (argc < 3)
|
|
return usage(argv[0]);
|
|
|
|
cg_fd = open(argv[1], O_DIRECTORY | O_RDONLY);
|
|
if (cg_fd < 0) {
|
|
printf("Failed to open cgroup path: '%s'\n", strerror(errno));
|
|
return EXIT_FAILURE;
|
|
}
|
|
|
|
if (load_bpf_file(argv[2]))
|
|
return EXIT_FAILURE;
|
|
|
|
printf("Output from kernel verifier:\n%s\n-------\n", bpf_log_buf);
|
|
|
|
if (argc > 3)
|
|
filter_id = atoi(argv[3]);
|
|
|
|
if (filter_id >= prog_cnt) {
|
|
printf("Invalid program id; program not found in file\n");
|
|
return EXIT_FAILURE;
|
|
}
|
|
|
|
ret = bpf_prog_attach(prog_fd[filter_id], cg_fd,
|
|
BPF_CGROUP_INET_SOCK_CREATE, 0);
|
|
if (ret < 0) {
|
|
printf("Failed to attach prog to cgroup: '%s'\n",
|
|
strerror(errno));
|
|
return EXIT_FAILURE;
|
|
}
|
|
|
|
return EXIT_SUCCESS;
|
|
}
|