// SPDX-License-Identifier: GPL-2.0-only

/*
 * Copyright 2020 Google LLC.
 */

#include <test_progs.h>
#include <cgroup_helpers.h>
#include <network_helpers.h>

#include "metadata_unused.skel.h"
#include "metadata_used.skel.h"

static int duration;

static int prog_holds_map(int prog_fd, int map_fd)
{
        struct bpf_prog_info prog_info = {};
        struct bpf_map_info map_info = {};
        __u32 prog_info_len;
        __u32 map_info_len;
        __u32 *map_ids;
        int nr_maps;
        int ret;
        int i;

        map_info_len = sizeof(map_info);
        ret = bpf_map_get_info_by_fd(map_fd, &map_info, &map_info_len);
        if (ret)
                return -errno;

        prog_info_len = sizeof(prog_info);
        ret = bpf_prog_get_info_by_fd(prog_fd, &prog_info, &prog_info_len);
        if (ret)
                return -errno;

        map_ids = calloc(prog_info.nr_map_ids, sizeof(__u32));
        if (!map_ids)
                return -ENOMEM;

        nr_maps = prog_info.nr_map_ids;
        memset(&prog_info, 0, sizeof(prog_info));
        prog_info.nr_map_ids = nr_maps;
        prog_info.map_ids = ptr_to_u64(map_ids);
        prog_info_len = sizeof(prog_info);

        ret = bpf_prog_get_info_by_fd(prog_fd, &prog_info, &prog_info_len);
        if (ret) {
                ret = -errno;
                goto free_map_ids;
        }

        ret = -ENOENT;
        for (i = 0; i < prog_info.nr_map_ids; i++) {
                if (map_ids[i] == map_info.id) {
                        ret = 0;
                        break;
                }
        }

free_map_ids:
        free(map_ids);
        return ret;
}

static void test_metadata_unused(void)
{
        struct metadata_unused *obj;
        int err;

        obj = metadata_unused__open_and_load();
        if (CHECK(!obj, "skel-load", "errno %d", errno))
                return;

        err = prog_holds_map(bpf_program__fd(obj->progs.prog),
                             bpf_map__fd(obj->maps.rodata));
        if (CHECK(err, "prog-holds-rodata", "errno: %d", err))
                return;

        /* Assert that we can access the metadata in skel and the values are
         * what we expect.
         */
        if (CHECK(strncmp(obj->rodata->bpf_metadata_a, "foo",
                          sizeof(obj->rodata->bpf_metadata_a)),
                  "bpf_metadata_a", "expected \"foo\", value differ"))
                goto close_bpf_object;
        if (CHECK(obj->rodata->bpf_metadata_b != 1, "bpf_metadata_b",
                  "expected 1, got %d", obj->rodata->bpf_metadata_b))
                goto close_bpf_object;

        /* Assert that binding metadata map to prog again succeeds. */
        err = bpf_prog_bind_map(bpf_program__fd(obj->progs.prog),
                                bpf_map__fd(obj->maps.rodata), NULL);
        CHECK(err, "rebind_map", "errno %d, expected 0", errno);

close_bpf_object:
        metadata_unused__destroy(obj);
}

static void test_metadata_used(void)
{
        struct metadata_used *obj;
        int err;

        obj = metadata_used__open_and_load();
        if (CHECK(!obj, "skel-load", "errno %d", errno))
                return;

        err = prog_holds_map(bpf_program__fd(obj->progs.prog),
                             bpf_map__fd(obj->maps.rodata));
        if (CHECK(err, "prog-holds-rodata", "errno: %d", err))
                return;

        /* Assert that we can access the metadata in skel and the values are
         * what we expect.
         */
        if (CHECK(strncmp(obj->rodata->bpf_metadata_a, "bar",
                          sizeof(obj->rodata->bpf_metadata_a)),
                  "metadata_a", "expected \"bar\", value differ"))
                goto close_bpf_object;
        if (CHECK(obj->rodata->bpf_metadata_b != 2, "metadata_b",
                  "expected 2, got %d", obj->rodata->bpf_metadata_b))
                goto close_bpf_object;

        /* Assert that binding metadata map to prog again succeeds. */
        err = bpf_prog_bind_map(bpf_program__fd(obj->progs.prog),
                                bpf_map__fd(obj->maps.rodata), NULL);
        CHECK(err, "rebind_map", "errno %d, expected 0", errno);

close_bpf_object:
        metadata_used__destroy(obj);
}

void test_metadata(void)
{
        if (test__start_subtest("unused"))
                test_metadata_unused();

        if (test__start_subtest("used"))
                test_metadata_used();
}