LXR linux/tools/testing/selftests/bpf/prog

   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
  14static int duration;
  15
  16static int prog_holds_map(int prog_fd, int map_fd)
  17{
  18        struct bpf_prog_info prog_info = {};
  19        struct bpf_prog_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_obj_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_obj_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_obj_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
  61free_map_ids:
  62        free(map_ids);
  63        return ret;
  64}
  65
  66static 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
  96close_bpf_object:
  97        metadata_unused__destroy(obj);
  98}
  99
 100static 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
 130close_bpf_object:
 131        metadata_used__destroy(obj);
 132}
 133
 134void 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}
 142