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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2020 Facebook */
#include <test_progs.h>
#include "test_module_attach.skel.h"
static int duration;
static int trigger_module_test_read(int read_sz)
{
int fd, err;
fd = open("/sys/kernel/bpf_testmod", O_RDONLY);
err = -errno;
if (CHECK(fd < 0, "testmod_file_open", "failed: %d\n", err))
return err;
read(fd, NULL, read_sz);
close(fd);
return 0;
}
static int trigger_module_test_write(int write_sz)
{
int fd, err;
char *buf = malloc(write_sz);
if (!buf)
return -ENOMEM;
memset(buf, 'a', write_sz);
buf[write_sz-1] = '\0';
fd = open("/sys/kernel/bpf_testmod", O_WRONLY);
err = -errno;
if (CHECK(fd < 0, "testmod_file_open", "failed: %d\n", err)) {
free(buf);
return err;
}
write(fd, buf, write_sz);
close(fd);
free(buf);
return 0;
}
static int delete_module(const char *name, int flags)
{
return syscall(__NR_delete_module, name, flags);
}
void test_module_attach(void)
{
const int READ_SZ = 456;
const int WRITE_SZ = 457;
struct test_module_attach* skel;
struct test_module_attach__bss *bss;
struct bpf_link *link;
int err;
skel = test_module_attach__open();
if (CHECK(!skel, "skel_open", "failed to open skeleton\n"))
return;
err = bpf_program__set_attach_target(skel->progs.handle_fentry_manual,
0, "bpf_testmod_test_read");
ASSERT_OK(err, "set_attach_target");
err = test_module_attach__load(skel);
if (CHECK(err, "skel_load", "failed to load skeleton\n"))
return;
bss = skel->bss;
err = test_module_attach__attach(skel);
if (CHECK(err, "skel_attach", "skeleton attach failed: %d\n", err))
goto cleanup;
/* trigger tracepoint */
ASSERT_OK(trigger_module_test_read(READ_SZ), "trigger_read");
ASSERT_OK(trigger_module_test_write(WRITE_SZ), "trigger_write");
ASSERT_EQ(bss->raw_tp_read_sz, READ_SZ, "raw_tp");
ASSERT_EQ(bss->raw_tp_bare_write_sz, WRITE_SZ, "raw_tp_bare");
ASSERT_EQ(bss->tp_btf_read_sz, READ_SZ, "tp_btf");
ASSERT_EQ(bss->fentry_read_sz, READ_SZ, "fentry");
ASSERT_EQ(bss->fentry_manual_read_sz, READ_SZ, "fentry_manual");
ASSERT_EQ(bss->fexit_read_sz, READ_SZ, "fexit");
ASSERT_EQ(bss->fexit_ret, -EIO, "fexit_tet");
ASSERT_EQ(bss->fmod_ret_read_sz, READ_SZ, "fmod_ret");
test_module_attach__detach(skel);
/* attach fentry/fexit and make sure it get's module reference */
link = bpf_program__attach(skel->progs.handle_fentry);
if (!ASSERT_OK_PTR(link, "attach_fentry"))
goto cleanup;
ASSERT_ERR(delete_module("bpf_testmod", 0), "delete_module");
bpf_link__destroy(link);
link = bpf_program__attach(skel->progs.handle_fexit);
if (!ASSERT_OK_PTR(link, "attach_fexit"))
goto cleanup;
ASSERT_ERR(delete_module("bpf_testmod", 0), "delete_module");
bpf_link__destroy(link);
cleanup:
test_module_attach__destroy(skel);
}
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