1 // SPDX-License-Identifier: GPL-2.0-only
2 #define _GNU_SOURCE
3 #include <test_progs.h>
4
5 struct inst {
6 struct bpf_object *obj;
7 struct bpf_link *link;
8 };
9
10 static 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 */
34 void 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
94 cleanup:
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
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