tools/testing/selftests/bpf/testing_helpers.c

   1 // SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
   2 /* Copyright (C) 2020 Facebook, Inc. */
   3 #include <stdlib.h>
   4 #include <errno.h>
   5 #include "testing_helpers.h"
   6
   7 int parse_num_list(const char *s, bool **num_set, int *num_set_len)
   8 {
   9         int i, set_len = 0, new_len, num, start = 0, end = -1;
  10         bool *set = NULL, *tmp, parsing_end = false;
  11         char *next;
  12
  13         while (s[0]) {
  14                 errno = 0;
  15                 num = strtol(s, &next, 10);
  16                 if (errno)
  17                         return -errno;
  18
  19                 if (parsing_end)
  20                         end = num;
  21                 else
  22                         start = num;
  23
  24                 if (!parsing_end && *next == '-') {
  25                         s = next + 1;
  26                         parsing_end = true;
  27                         continue;
  28                 } else if (*next == ',') {
  29                         parsing_end = false;
  30                         s = next + 1;
  31                         end = num;
  32                 } else if (*next == '\0') {
  33                         parsing_end = false;
  34                         s = next;
  35                         end = num;
  36                 } else {
  37                         return -EINVAL;
  38                 }
  39
  40                 if (start > end)
  41                         return -EINVAL;
  42
  43                 if (end + 1 > set_len) {
  44                         new_len = end + 1;
  45                         tmp = realloc(set, new_len);
  46                         if (!tmp) {
  47                                 free(set);
  48                                 return -ENOMEM;
  49                         }
  50                         for (i = set_len; i < start; i++)
  51                                 tmp[i] = false;
  52                         set = tmp;
  53                         set_len = new_len;
  54                 }
  55                 for (i = start; i <= end; i++)
  56                         set[i] = true;
  57         }
  58
  59         if (!set)
  60                 return -EINVAL;
  61
  62         *num_set = set;
  63         *num_set_len = set_len;
  64
  65         return 0;
  66 }
  67
  68 __u32 link_info_prog_id(const struct bpf_link *link, struct bpf_link_info *info)
  69 {
  70         __u32 info_len = sizeof(*info);
  71         int err;
  72
  73         memset(info, 0, sizeof(*info));
  74         err = bpf_obj_get_info_by_fd(bpf_link__fd(link), info, &info_len);
  75         if (err) {
  76                 printf("failed to get link info: %d\n", -errno);
  77                 return 0;
  78         }
  79         return info->prog_id;
  80 }