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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2020 Facebook */
#include <test_progs.h>
#include "bpf_iter_ipv6_route.skel.h"
#include "bpf_iter_netlink.skel.h"
#include "bpf_iter_bpf_map.skel.h"
#include "bpf_iter_task.skel.h"
#include "bpf_iter_task_file.skel.h"
#include "bpf_iter_test_kern1.skel.h"
#include "bpf_iter_test_kern2.skel.h"
#include "bpf_iter_test_kern3.skel.h"
#include "bpf_iter_test_kern4.skel.h"
static int duration;
static void test_btf_id_or_null(void)
{
struct bpf_iter_test_kern3 *skel;
skel = bpf_iter_test_kern3__open_and_load();
if (CHECK(skel, "bpf_iter_test_kern3__open_and_load",
"skeleton open_and_load unexpectedly succeeded\n")) {
bpf_iter_test_kern3__destroy(skel);
return;
}
}
static void do_dummy_read(struct bpf_program *prog)
{
struct bpf_link *link;
char buf[16] = {};
int iter_fd, len;
link = bpf_program__attach_iter(prog, NULL);
if (CHECK(IS_ERR(link), "attach_iter", "attach_iter failed\n"))
return;
iter_fd = bpf_iter_create(bpf_link__fd(link));
if (CHECK(iter_fd < 0, "create_iter", "create_iter failed\n"))
goto free_link;
/* not check contents, but ensure read() ends without error */
while ((len = read(iter_fd, buf, sizeof(buf))) > 0)
;
CHECK(len < 0, "read", "read failed: %s\n", strerror(errno));
close(iter_fd);
free_link:
bpf_link__destroy(link);
}
static void test_ipv6_route(void)
{
struct bpf_iter_ipv6_route *skel;
skel = bpf_iter_ipv6_route__open_and_load();
if (CHECK(!skel, "bpf_iter_ipv6_route__open_and_load",
"skeleton open_and_load failed\n"))
return;
do_dummy_read(skel->progs.dump_ipv6_route);
bpf_iter_ipv6_route__destroy(skel);
}
static void test_netlink(void)
{
struct bpf_iter_netlink *skel;
skel = bpf_iter_netlink__open_and_load();
if (CHECK(!skel, "bpf_iter_netlink__open_and_load",
"skeleton open_and_load failed\n"))
return;
do_dummy_read(skel->progs.dump_netlink);
bpf_iter_netlink__destroy(skel);
}
static void test_bpf_map(void)
{
struct bpf_iter_bpf_map *skel;
skel = bpf_iter_bpf_map__open_and_load();
if (CHECK(!skel, "bpf_iter_bpf_map__open_and_load",
"skeleton open_and_load failed\n"))
return;
do_dummy_read(skel->progs.dump_bpf_map);
bpf_iter_bpf_map__destroy(skel);
}
static void test_task(void)
{
struct bpf_iter_task *skel;
skel = bpf_iter_task__open_and_load();
if (CHECK(!skel, "bpf_iter_task__open_and_load",
"skeleton open_and_load failed\n"))
return;
do_dummy_read(skel->progs.dump_task);
bpf_iter_task__destroy(skel);
}
static void test_task_file(void)
{
struct bpf_iter_task_file *skel;
skel = bpf_iter_task_file__open_and_load();
if (CHECK(!skel, "bpf_iter_task_file__open_and_load",
"skeleton open_and_load failed\n"))
return;
do_dummy_read(skel->progs.dump_task_file);
bpf_iter_task_file__destroy(skel);
}
/* The expected string is less than 16 bytes */
static int do_read_with_fd(int iter_fd, const char *expected,
bool read_one_char)
{
int err = -1, len, read_buf_len, start;
char buf[16] = {};
read_buf_len = read_one_char ? 1 : 16;
start = 0;
while ((len = read(iter_fd, buf + start, read_buf_len)) > 0) {
start += len;
if (CHECK(start >= 16, "read", "read len %d\n", len))
return -1;
read_buf_len = read_one_char ? 1 : 16 - start;
}
if (CHECK(len < 0, "read", "read failed: %s\n", strerror(errno)))
return -1;
err = strcmp(buf, expected);
if (CHECK(err, "read", "incorrect read result: buf %s, expected %s\n",
buf, expected))
return -1;
return 0;
}
static void test_anon_iter(bool read_one_char)
{
struct bpf_iter_test_kern1 *skel;
struct bpf_link *link;
int iter_fd, err;
skel = bpf_iter_test_kern1__open_and_load();
if (CHECK(!skel, "bpf_iter_test_kern1__open_and_load",
"skeleton open_and_load failed\n"))
return;
err = bpf_iter_test_kern1__attach(skel);
if (CHECK(err, "bpf_iter_test_kern1__attach",
"skeleton attach failed\n")) {
goto out;
}
link = skel->links.dump_task;
iter_fd = bpf_iter_create(bpf_link__fd(link));
if (CHECK(iter_fd < 0, "create_iter", "create_iter failed\n"))
goto out;
do_read_with_fd(iter_fd, "abcd", read_one_char);
close(iter_fd);
out:
bpf_iter_test_kern1__destroy(skel);
}
static int do_read(const char *path, const char *expected)
{
int err, iter_fd;
iter_fd = open(path, O_RDONLY);
if (CHECK(iter_fd < 0, "open", "open %s failed: %s\n",
path, strerror(errno)))
return -1;
err = do_read_with_fd(iter_fd, expected, false);
close(iter_fd);
return err;
}
static void test_file_iter(void)
{
const char *path = "/sys/fs/bpf/bpf_iter_test1";
struct bpf_iter_test_kern1 *skel1;
struct bpf_iter_test_kern2 *skel2;
struct bpf_link *link;
int err;
skel1 = bpf_iter_test_kern1__open_and_load();
if (CHECK(!skel1, "bpf_iter_test_kern1__open_and_load",
"skeleton open_and_load failed\n"))
return;
link = bpf_program__attach_iter(skel1->progs.dump_task, NULL);
if (CHECK(IS_ERR(link), "attach_iter", "attach_iter failed\n"))
goto out;
/* unlink this path if it exists. */
unlink(path);
err = bpf_link__pin(link, path);
if (CHECK(err, "pin_iter", "pin_iter to %s failed: %d\n", path, err))
goto free_link;
err = do_read(path, "abcd");
if (err)
goto unlink_path;
/* file based iterator seems working fine. Let us a link update
* of the underlying link and `cat` the iterator again, its content
* should change.
*/
skel2 = bpf_iter_test_kern2__open_and_load();
if (CHECK(!skel2, "bpf_iter_test_kern2__open_and_load",
"skeleton open_and_load failed\n"))
goto unlink_path;
err = bpf_link__update_program(link, skel2->progs.dump_task);
if (CHECK(err, "update_prog", "update_prog failed\n"))
goto destroy_skel2;
do_read(path, "ABCD");
destroy_skel2:
bpf_iter_test_kern2__destroy(skel2);
unlink_path:
unlink(path);
free_link:
bpf_link__destroy(link);
out:
bpf_iter_test_kern1__destroy(skel1);
}
static void test_overflow(bool test_e2big_overflow, bool ret1)
{
__u32 map_info_len, total_read_len, expected_read_len;
int err, iter_fd, map1_fd, map2_fd, len;
struct bpf_map_info map_info = {};
struct bpf_iter_test_kern4 *skel;
struct bpf_link *link;
__u32 page_size;
char *buf;
skel = bpf_iter_test_kern4__open();
if (CHECK(!skel, "bpf_iter_test_kern4__open",
"skeleton open failed\n"))
return;
/* create two maps: bpf program will only do bpf_seq_write
* for these two maps. The goal is one map output almost
* fills seq_file buffer and then the other will trigger
* overflow and needs restart.
*/
map1_fd = bpf_create_map(BPF_MAP_TYPE_ARRAY, 4, 8, 1, 0);
if (CHECK(map1_fd < 0, "bpf_create_map",
"map_creation failed: %s\n", strerror(errno)))
goto out;
map2_fd<
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