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// SPDX-License-Identifier: GPL-2.0-only
#define _GNU_SOURCE
#include <test_progs.h>
#define MAX_TRAMP_PROGS 38
struct inst {
struct bpf_object *obj;
struct bpf_link *link;
};
static struct bpf_program *load_prog(char *file, char *name, struct inst *inst)
{
struct bpf_object *obj;
struct bpf_program *prog;
int err;
obj = bpf_object__open_file(file, NULL);
if (!ASSERT_OK_PTR(obj, "obj_open_file"))
return NULL;
inst->obj = obj;
err = bpf_object__load(obj);
if (!ASSERT_OK(err, "obj_load"))
return NULL;
prog = bpf_object__find_program_by_name(obj, name);
if (!ASSERT_OK_PTR(prog, "obj_find_prog"))
return NULL;
return prog;
}
/* TODO: use different target function to run in concurrent mode */
void serial_test_trampoline_count(void)
{
char *file = "test_trampoline_count.bpf.o";
char *const progs[] = { "fentry_test", "fmod_ret_test", "fexit_test" };
struct inst inst[MAX_TRAMP_PROGS + 1] = {};
struct bpf_program *prog;
struct bpf_link *link;
int prog_fd, err, i;
LIBBPF_OPTS(bpf_test_run_opts, opts);
/* attach 'allowed' trampoline programs */
for (i = 0; i < MAX_TRAMP_PROGS; i++) {
prog = load_prog(file, progs[i % ARRAY_SIZE(progs)], &inst[i]);
if (!prog)
goto cleanup;
link = bpf_program__attach(prog);
if (!ASSERT_OK_PTR(link, "attach_prog"))
goto cleanup;
inst[i].link = link;
}
/* and try 1 extra.. */
prog = load_prog(file, "fmod_ret_test", &inst[i]);
if (!prog)
goto cleanup;
/* ..that needs to fail */
link = bpf_program__attach(prog);
if (!ASSERT_ERR_PTR(link, "attach_prog")) {
inst[i].link = link;
goto cleanup;
}
/* with E2BIG error */
if (!ASSERT_EQ(libbpf_get_error(link), -E2BIG, "E2BIG"))
goto cleanup;
if (!ASSERT_EQ(link, NULL, "ptr_is_null"))
goto cleanup;
/* and finaly execute the probe */
prog_fd = bpf_program__fd(prog);
if (!ASSERT_GE(prog_fd, 0, "bpf_program__fd"))
goto cleanup;
err = bpf_prog_test_run_opts(prog_fd, &opts);
if (!ASSERT_OK(err, "bpf_prog_test_run_opts"))
goto cleanup;
ASSERT_EQ(opts.retval & 0xffff, 4, "bpf_modify_return_test.result");
ASSERT_EQ(opts.retval >> 16, 1, "bpf_modify_return_test.side_effect");
cleanup:
for (; i >= 0; i--) {
bpf_link__destroy(inst[i].link);
bpf_object__close(inst[i].obj);
}
}
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