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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2020 Facebook */
#include <test_progs.h>
#include <stdbool.h>
#include "test_module_attach.skel.h"
#include "testing_helpers.h"
static const char * const read_tests[] = {
"handle_raw_tp",
"handle_tp_btf",
"handle_fentry",
"handle_fentry_explicit",
"handle_fmod_ret",
};
static const char * const detach_tests[] = {
"handle_fentry",
"handle_fexit",
"kprobe_multi",
};
static const int READ_SZ = 456;
static const int WRITE_SZ = 457;
static int trigger_module_test_writable(int *val)
{
int fd, err;
char buf[65];
ssize_t rd;
fd = open(BPF_TESTMOD_TEST_FILE, O_RDONLY);
err = -errno;
if (!ASSERT_GE(fd, 0, "testmode_file_open"))
return err;
rd = read(fd, buf, sizeof(buf) - 1);
err = -errno;
if (!ASSERT_GT(rd, 0, "testmod_file_rd_val")) {
close(fd);
return err;
}
buf[rd] = '\0';
*val = strtol(buf, NULL, 0);
close(fd);
return 0;
}
static void test_module_attach_prog(const char *prog_name, int sz,
const char *attach_target, int ret)
{
struct test_module_attach *skel;
struct bpf_program *prog;
int err;
skel = test_module_attach__open();
if (!ASSERT_OK_PTR(skel, "module_attach open"))
return;
prog = bpf_object__find_program_by_name(skel->obj, prog_name);
if (!ASSERT_OK_PTR(prog, "module_attach find_program"))
goto cleanup;
bpf_program__set_autoload(prog, true);
if (attach_target) {
err = bpf_program__set_attach_target(prog, 0, attach_target);
if (!ASSERT_OK(err, attach_target))
goto cleanup;
}
err = test_module_attach__load(skel);
if (!ASSERT_OK(err, "module_attach load"))
goto cleanup;
err = test_module_attach__attach(skel);
if (!ASSERT_OK(err, "module_attach attach"))
goto cleanup;
if (sz) {
/* trigger both read and write though each test uses only one */
ASSERT_OK(trigger_module_test_read(sz), "trigger_read");
ASSERT_OK(trigger_module_test_write(sz), "trigger_write");
ASSERT_EQ(skel->bss->sz, sz, prog_name);
}
if (ret)
ASSERT_EQ(skel->bss->retval, ret, "ret");
cleanup:
test_module_attach__destroy(skel);
}
static void test_module_attach_writable(void)
{
struct test_module_attach__bss *bss;
struct test_module_attach *skel;
int writable_val = 0;
int err;
skel = test_module_attach__open();
if (!ASSERT_OK_PTR(skel, "module_attach open"))
return;
bpf_program__set_autoload(skel->progs.handle_raw_tp_writable_bare, true);
err = test_module_attach__load(skel);
if (!ASSERT_OK(err, "module_attach load"))
goto cleanup;
bss = skel->bss;
err = test_module_attach__attach(skel);
if (!ASSERT_OK(err, "module_attach attach"))
goto cleanup;
bss->raw_tp_writable_bare_early_ret = true;
bss->raw_tp_writable_bare_out_val = 0xf1f2f3f4;
ASSERT_OK(trigger_module_test_writable(&writable_val),
"trigger_writable");
ASSERT_EQ(bss->raw_tp_writable_bare_in_val, 1024, "writable_test_in");
ASSERT_EQ(bss->raw_tp_writable_bare_out_val, writable_val,
"writable_test_out");
cleanup:
test_module_attach__destroy(skel);
}
static void test_module_attach_detach(const char *prog_name)
{
struct test_module_attach *skel;
struct bpf_program *prog;
struct bpf_link *link;
int err;
skel = test_module_attach__open();
if (!ASSERT_OK_PTR(skel, "module_attach open"))
return;
prog = bpf_object__find_program_by_name(skel->obj, prog_name);
if (!ASSERT_OK_PTR(prog, "module_attach find_program"))
goto cleanup;
bpf_program__set_autoload(prog, true);
err = test_module_attach__load(skel);
if (!ASSERT_OK(err, "module_attach load"))
goto cleanup;
/* attach and make sure it gets module reference */
link = bpf_program__attach(prog);
if (!ASSERT_OK_PTR(link, "module_attach attach"))
goto cleanup;
ASSERT_ERR(try_unload_module("bpf_testmod", 1, false), "try_unload_module");
bpf_link__destroy(link);
cleanup:
test_module_attach__destroy(skel);
}
void test_module_attach(void)
{
int i;
for (i = 0; i < ARRAY_SIZE(read_tests); i++) {
if (!test__start_subtest(read_tests[i]))
continue;
test_module_attach_prog(read_tests[i], READ_SZ, NULL, 0);
}
if (test__start_subtest("handle_raw_tp_bare"))
test_module_attach_prog("handle_raw_tp_bare", WRITE_SZ, NULL, 0);
if (test__start_subtest("handle_raw_tp_writable_bare"))
test_module_attach_writable();
if (test__start_subtest("handle_fentry_manual")) {
test_module_attach_prog("handle_fentry_manual", READ_SZ,
"bpf_testmod_test_read", 0);
}
if (test__start_subtest("handle_fentry_explicit_manual")) {
test_module_attach_prog("handle_fentry_explicit_manual",
READ_SZ,
"bpf_testmod:bpf_testmod_test_read", 0);
}
if (test__start_subtest("handle_fexit"))
test_module_attach_prog("handle_fexit", READ_SZ, NULL, -EIO);
if (test__start_subtest("handle_fexit_ret"))
test_module_attach_prog("handle_fexit_ret", 0, NULL, 0);
for (i = 0; i < ARRAY_SIZE(detach_tests); i++) {
char test_name[50];
snprintf(test_name, sizeof(test_name), "%s_detach", detach_tests[i]);
if (!test__start_subtest(test_name))
continue;
test_module_attach_detach(detach_tests[i]);
}
}
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