tools/bpf/bpftool/iter.c

   1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
   2 // Copyright (C) 2020 Facebook
   3
   4 #define _GNU_SOURCE
   5 #include <linux/err.h>
   6 #include <bpf/libbpf.h>
   7
   8 #include "main.h"
   9
  10 static int do_pin(int argc, char **argv)
  11 {
  12         const char *objfile, *path;
  13         struct bpf_program *prog;
  14         struct bpf_object *obj;
  15         struct bpf_link *link;
  16         int err;
  17
  18         if (!REQ_ARGS(2))
  19                 usage();
  20
  21         objfile = GET_ARG();
  22         path = GET_ARG();
  23
  24         obj = bpf_object__open(objfile);
  25         if (IS_ERR(obj)) {
  26                 p_err("can't open objfile %s", objfile);
  27                 return -1;
  28         }
  29
  30         err = bpf_object__load(obj);
  31         if (err) {
  32                 p_err("can't load objfile %s", objfile);
  33                 goto close_obj;
  34         }
  35
  36         prog = bpf_program__next(NULL, obj);
  37         if (!prog) {
  38                 p_err("can't find bpf program in objfile %s", objfile);
  39                 goto close_obj;
  40         }
  41
  42         link = bpf_program__attach_iter(prog, NULL);
  43         if (IS_ERR(link)) {
  44                 err = PTR_ERR(link);
  45                 p_err("attach_iter failed for program %s",
  46                       bpf_program__name(prog));
  47                 goto close_obj;
  48         }
  49
  50         err = mount_bpffs_for_pin(path);
  51         if (err)
  52                 goto close_link;
  53
  54         err = bpf_link__pin(link, path);
  55         if (err) {
  56                 p_err("pin_iter failed for program %s to path %s",
  57                       bpf_program__name(prog), path);
  58                 goto close_link;
  59         }
  60
  61 close_link:
  62         bpf_link__destroy(link);
  63 close_obj:
  64         bpf_object__close(obj);
  65         return err;
  66 }
  67
  68 static int do_help(int argc, char **argv)
  69 {
  70         fprintf(stderr,
  71                 "Usage: %1$s %2$s pin OBJ PATH\n"
  72                 "       %1$s %2$s help\n"
  73                 "",
  74                 bin_name, "iter");
  75
  76         return 0;
  77 }
  78
  79 static const struct cmd cmds[] = {
  80         { "help",       do_help },
  81         { "pin",        do_pin },
  82         { 0 }
  83 };
  84
  85 int do_iter(int argc, char **argv)
  86 {
  87         return cmd_select(cmds, argc, argv, do_help);
  88 }