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