tools/testing/selftests/bpf/prog_tests/metadata.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2
   3 /*
   4  * Copyright 2020 Google LLC.
   5  */
   6
   7 #include <test_progs.h>
   8 #include <cgroup_helpers.h>
   9 #include <network_helpers.h>
  10
  11 #include "metadata_unused.skel.h"
  12 #include "metadata_used.skel.h"
  13
  14 static int duration;
  15
  16 static int prog_holds_map(int prog_fd, int map_fd)
  17 {
  18         struct bpf_prog_info prog_info = {};
  19         struct bpf_map_info map_info = {};
  20         __u32 prog_info_len;
  21         __u32 map_info_len;
  22         __u32 *map_ids;
  23         int nr_maps;
  24         int ret;
  25         int i;
  26
  27         map_info_len = sizeof(map_info);
  28         ret = bpf_map_get_info_by_fd(map_fd, &map_info, &map_info_len);
  29         if (ret)
  30                 return -errno;
  31
  32         prog_info_len = sizeof(prog_info);
  33         ret = bpf_prog_get_info_by_fd(prog_fd, &prog_info, &prog_info_len);
  34         if (ret)
  35                 return -errno;
  36
  37         map_ids = calloc(prog_info.nr_map_ids, sizeof(__u32));
  38         if (!map_ids)
  39                 return -ENOMEM;
  40
  41         nr_maps = prog_info.nr_map_ids;
  42         memset(&prog_info, 0, sizeof(prog_info));
  43         prog_info.nr_map_ids = nr_maps;
  44         prog_info.map_ids = ptr_to_u64(map_ids);
  45         prog_info_len = sizeof(prog_info);
  46
  47         ret = bpf_prog_get_info_by_fd(prog_fd, &prog_info, &prog_info_len);
  48         if (ret) {
  49                 ret = -errno;
  50                 goto free_map_ids;
  51         }
  52
  53         ret = -ENOENT;
  54         for (i = 0; i < prog_info.nr_map_ids; i++) {
  55                 if (map_ids[i] == map_info.id) {
  56                         ret = 0;
  57                         break;
  58                 }
  59         }
  60
  61 free_map_ids:
  62         free(map_ids);
  63         return ret;
  64 }
  65
  66 static void test_metadata_unused(void)
  67 {
  68         struct metadata_unused *obj;
  69         int err;
  70
  71         obj = metadata_unused__open_and_load();
  72         if (CHECK(!obj, "skel-load", "errno %d", errno))
  73                 return;
  74
  75         err = prog_holds_map(bpf_program__fd(obj->progs.prog),
  76                              bpf_map__fd(obj->maps.rodata));
  77         if (CHECK(err, "prog-holds-rodata", "errno: %d", err))
  78                 return;
  79
  80         /* Assert that we can access the metadata in skel and the values are
  81          * what we expect.
  82          */
  83         if (CHECK(strncmp(obj->rodata->bpf_metadata_a, "foo",
  84                           sizeof(obj->rodata->bpf_metadata_a)),
  85                   "bpf_metadata_a", "expected \"foo\", value differ"))
  86                 goto close_bpf_object;
  87         if (CHECK(obj->rodata->bpf_metadata_b != 1, "bpf_metadata_b",
  88                   "expected 1, got %d", obj->rodata->bpf_metadata_b))
  89                 goto close_bpf_object;
  90
  91         /* Assert that binding metadata map to prog again succeeds. */
  92         err = bpf_prog_bind_map(bpf_program__fd(obj->progs.prog),
  93                                 bpf_map__fd(obj->maps.rodata), NULL);
  94         CHECK(err, "rebind_map", "errno %d, expected 0", errno);
  95
  96 close_bpf_object:
  97         metadata_unused__destroy(obj);
  98 }
  99
 100 static void test_metadata_used(void)
 101 {
 102         struct metadata_used *obj;
 103         int err;
 104
 105         obj = metadata_used__open_and_load();
 106         if (CHECK(!obj, "skel-load", "errno %d", errno))
 107                 return;
 108
 109         err = prog_holds_map(bpf_program__fd(obj->progs.prog),
 110                              bpf_map__fd(obj->maps.rodata));
 111         if (CHECK(err, "prog-holds-rodata", "errno: %d", err))
 112                 return;
 113
 114         /* Assert that we can access the metadata in skel and the values are
 115          * what we expect.
 116          */
 117         if (CHECK(strncmp(obj->rodata->bpf_metadata_a, "bar",
 118                           sizeof(obj->rodata->bpf_metadata_a)),
 119                   "metadata_a", "expected \"bar\", value differ"))
 120                 goto close_bpf_object;
 121         if (CHECK(obj->rodata->bpf_metadata_b != 2, "metadata_b",
 122                   "expected 2, got %d", obj->rodata->bpf_metadata_b))
 123                 goto close_bpf_object;
 124
 125         /* Assert that binding metadata map to prog again succeeds. */
 126         err = bpf_prog_bind_map(bpf_program__fd(obj->progs.prog),
 127                                 bpf_map__fd(obj->maps.rodata), NULL);
 128         CHECK(err, "rebind_map", "errno %d, expected 0", errno);
 129
 130 close_bpf_object:
 131         metadata_used__destroy(obj);
 132 }
 133
 134 void test_metadata(void)
 135 {
 136         if (test__start_subtest("unused"))
 137                 test_metadata_unused();
 138
 139         if (test__start_subtest("used"))
 140                 test_metadata_used();
 141 }