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Linux/samples/bpf/test_cgrp2_sock2.c

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  1 /* eBPF example program:
  2  *
  3  * - Loads eBPF program
  4  *
  5  *   The eBPF program loads a filter from file and attaches the
  6  *   program to a cgroup using BPF_PROG_ATTACH
  7  */
  8 
  9 #define _GNU_SOURCE
 10 
 11 #include <stdio.h>
 12 #include <stdlib.h>
 13 #include <stddef.h>
 14 #include <string.h>
 15 #include <unistd.h>
 16 #include <assert.h>
 17 #include <errno.h>
 18 #include <fcntl.h>
 19 #include <net/if.h>
 20 #include <linux/bpf.h>
 21 
 22 #include "libbpf.h"
 23 #include "bpf_load.h"
 24 
 25 static int usage(const char *argv0)
 26 {
 27         printf("Usage: %s cg-path filter-path [filter-id]\n", argv0);
 28         return EXIT_FAILURE;
 29 }
 30 
 31 int main(int argc, char **argv)
 32 {
 33         int cg_fd, ret, filter_id = 0;
 34 
 35         if (argc < 3)
 36                 return usage(argv[0]);
 37 
 38         cg_fd = open(argv[1], O_DIRECTORY | O_RDONLY);
 39         if (cg_fd < 0) {
 40                 printf("Failed to open cgroup path: '%s'\n", strerror(errno));
 41                 return EXIT_FAILURE;
 42         }
 43 
 44         if (load_bpf_file(argv[2]))
 45                 return EXIT_FAILURE;
 46 
 47         printf("Output from kernel verifier:\n%s\n-------\n", bpf_log_buf);
 48 
 49         if (argc > 3)
 50                 filter_id = atoi(argv[3]);
 51 
 52         if (filter_id > prog_cnt) {
 53                 printf("Invalid program id; program not found in file\n");
 54                 return EXIT_FAILURE;
 55         }
 56 
 57         ret = bpf_prog_attach(prog_fd[filter_id], cg_fd,
 58                               BPF_CGROUP_INET_SOCK_CREATE, 0);
 59         if (ret < 0) {
 60                 printf("Failed to attach prog to cgroup: '%s'\n",
 61                        strerror(errno));
 62                 return EXIT_FAILURE;
 63         }
 64 
 65         return EXIT_SUCCESS;
 66 }
 67 

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