1// SPDX-License-Identifier: GPL-2.0-only
2#define _GNU_SOURCE
3#include <test_progs.h>
4
5struct inst {
6	struct bpf_object *obj;
7	struct bpf_link   *link;
8};
9
10static struct bpf_program *load_prog(char *file, char *name, struct inst *inst)
11{
12	struct bpf_object *obj;
13	struct bpf_program *prog;
14	int err;
15
16	obj = bpf_object__open_file(file, NULL);
17	if (!ASSERT_OK_PTR(obj, "obj_open_file"))
18		return NULL;
19
20	inst->obj = obj;
21
22	err = bpf_object__load(obj);
23	if (!ASSERT_OK(err, "obj_load"))
24		return NULL;
25
26	prog = bpf_object__find_program_by_name(obj, name);
27	if (!ASSERT_OK_PTR(prog, "obj_find_prog"))
28		return NULL;
29
30	return prog;
31}
32
33/* TODO: use different target function to run in concurrent mode */
34void serial_test_trampoline_count(void)
35{
36	char *file = "test_trampoline_count.bpf.o";
37	char *const progs[] = { "fentry_test", "fmod_ret_test", "fexit_test" };
38	int bpf_max_tramp_links, err, i, prog_fd;
39	struct bpf_program *prog;
40	struct bpf_link *link;
41	struct inst *inst;
42	LIBBPF_OPTS(bpf_test_run_opts, opts);
43
44	bpf_max_tramp_links = get_bpf_max_tramp_links();
45	if (!ASSERT_GE(bpf_max_tramp_links, 1, "bpf_max_tramp_links"))
46		return;
47	inst = calloc(bpf_max_tramp_links + 1, sizeof(*inst));
48	if (!ASSERT_OK_PTR(inst, "inst"))
49		return;
50
51	/* attach 'allowed' trampoline programs */
52	for (i = 0; i < bpf_max_tramp_links; i++) {
53		prog = load_prog(file, progs[i % ARRAY_SIZE(progs)], &inst[i]);
54		if (!prog)
55			goto cleanup;
56
57		link = bpf_program__attach(prog);
58		if (!ASSERT_OK_PTR(link, "attach_prog"))
59			goto cleanup;
60
61		inst[i].link = link;
62	}
63
64	/* and try 1 extra.. */
65	prog = load_prog(file, "fmod_ret_test", &inst[i]);
66	if (!prog)
67		goto cleanup;
68
69	/* ..that needs to fail */
70	link = bpf_program__attach(prog);
71	if (!ASSERT_ERR_PTR(link, "attach_prog")) {
72		inst[i].link = link;
73		goto cleanup;
74	}
75
76	/* with E2BIG error */
77	if (!ASSERT_EQ(libbpf_get_error(link), -E2BIG, "E2BIG"))
78		goto cleanup;
79	if (!ASSERT_EQ(link, NULL, "ptr_is_null"))
80		goto cleanup;
81
82	/* and finally execute the probe */
83	prog_fd = bpf_program__fd(prog);
84	if (!ASSERT_GE(prog_fd, 0, "bpf_program__fd"))
85		goto cleanup;
86
87	err = bpf_prog_test_run_opts(prog_fd, &opts);
88	if (!ASSERT_OK(err, "bpf_prog_test_run_opts"))
89		goto cleanup;
90
91	ASSERT_EQ(opts.retval & 0xffff, 33, "bpf_modify_return_test.result");
92	ASSERT_EQ(opts.retval >> 16, 2, "bpf_modify_return_test.side_effect");
93
94cleanup:
95	for (; i >= 0; i--) {
96		bpf_link__destroy(inst[i].link);
97		bpf_object__close(inst[i].obj);
98	}
99	free(inst);
100}
101