1// SPDX-License-Identifier: GPL-2.0
2/* Copyright (c) 2020 Facebook */
3
4#include <test_progs.h>
5#include <stdbool.h>
6#include "test_module_attach.skel.h"
7#include "testing_helpers.h"
8
9static int duration;
10
11static int trigger_module_test_writable(int *val)
12{
13	int fd, err;
14	char buf[65];
15	ssize_t rd;
16
17	fd = open(BPF_TESTMOD_TEST_FILE, O_RDONLY);
18	err = -errno;
19	if (!ASSERT_GE(fd, 0, "testmode_file_open"))
20		return err;
21
22	rd = read(fd, buf, sizeof(buf) - 1);
23	err = -errno;
24	if (!ASSERT_GT(rd, 0, "testmod_file_rd_val")) {
25		close(fd);
26		return err;
27	}
28
29	buf[rd] = '\0';
30	*val = strtol(buf, NULL, 0);
31	close(fd);
32
33	return 0;
34}
35
36void test_module_attach(void)
37{
38	const int READ_SZ = 456;
39	const int WRITE_SZ = 457;
40	struct test_module_attach* skel;
41	struct test_module_attach__bss *bss;
42	struct bpf_link *link;
43	int err;
44	int writable_val = 0;
45
46	skel = test_module_attach__open();
47	if (CHECK(!skel, "skel_open", "failed to open skeleton\n"))
48		return;
49
50	err = bpf_program__set_attach_target(skel->progs.handle_fentry_manual,
51					     0, "bpf_testmod_test_read");
52	ASSERT_OK(err, "set_attach_target");
53
54	err = test_module_attach__load(skel);
55	if (CHECK(err, "skel_load", "failed to load skeleton\n"))
56		return;
57
58	bss = skel->bss;
59
60	err = test_module_attach__attach(skel);
61	if (CHECK(err, "skel_attach", "skeleton attach failed: %d\n", err))
62		goto cleanup;
63
64	/* trigger tracepoint */
65	ASSERT_OK(trigger_module_test_read(READ_SZ), "trigger_read");
66	ASSERT_OK(trigger_module_test_write(WRITE_SZ), "trigger_write");
67
68	ASSERT_EQ(bss->raw_tp_read_sz, READ_SZ, "raw_tp");
69	ASSERT_EQ(bss->raw_tp_bare_write_sz, WRITE_SZ, "raw_tp_bare");
70	ASSERT_EQ(bss->tp_btf_read_sz, READ_SZ, "tp_btf");
71	ASSERT_EQ(bss->fentry_read_sz, READ_SZ, "fentry");
72	ASSERT_EQ(bss->fentry_manual_read_sz, READ_SZ, "fentry_manual");
73	ASSERT_EQ(bss->fexit_read_sz, READ_SZ, "fexit");
74	ASSERT_EQ(bss->fexit_ret, -EIO, "fexit_tet");
75	ASSERT_EQ(bss->fmod_ret_read_sz, READ_SZ, "fmod_ret");
76
77	bss->raw_tp_writable_bare_early_ret = true;
78	bss->raw_tp_writable_bare_out_val = 0xf1f2f3f4;
79	ASSERT_OK(trigger_module_test_writable(&writable_val),
80		  "trigger_writable");
81	ASSERT_EQ(bss->raw_tp_writable_bare_in_val, 1024, "writable_test_in");
82	ASSERT_EQ(bss->raw_tp_writable_bare_out_val, writable_val,
83		  "writable_test_out");
84
85	test_module_attach__detach(skel);
86
87	/* attach fentry/fexit and make sure it get's module reference */
88	link = bpf_program__attach(skel->progs.handle_fentry);
89	if (!ASSERT_OK_PTR(link, "attach_fentry"))
90		goto cleanup;
91
92	ASSERT_ERR(unload_bpf_testmod(false), "unload_bpf_testmod");
93	bpf_link__destroy(link);
94
95	link = bpf_program__attach(skel->progs.handle_fexit);
96	if (!ASSERT_OK_PTR(link, "attach_fexit"))
97		goto cleanup;
98
99	ASSERT_ERR(unload_bpf_testmod(false), "unload_bpf_testmod");
100	bpf_link__destroy(link);
101
102	link = bpf_program__attach(skel->progs.kprobe_multi);
103	if (!ASSERT_OK_PTR(link, "attach_kprobe_multi"))
104		goto cleanup;
105
106	ASSERT_ERR(unload_bpf_testmod(false), "unload_bpf_testmod");
107	bpf_link__destroy(link);
108
109cleanup:
110	test_module_attach__destroy(skel);
111}
112