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