| // SPDX-License-Identifier: GPL-2.0 |
| |
| /* |
| * Copyright 2020 Google LLC. |
| */ |
| |
| #include <test_progs.h> |
| #include "modify_return.skel.h" |
| |
| #define LOWER(x) ((x) & 0xffff) |
| #define UPPER(x) ((x) >> 16) |
| |
| |
| static void run_test(__u32 input_retval, __u16 want_side_effect, __s16 want_ret) |
| { |
| struct modify_return *skel = NULL; |
| int err, prog_fd; |
| __u32 duration = 0, retval; |
| __u16 side_effect; |
| __s16 ret; |
| |
| skel = modify_return__open_and_load(); |
| if (CHECK(!skel, "skel_load", "modify_return skeleton failed\n")) |
| goto cleanup; |
| |
| err = modify_return__attach(skel); |
| if (CHECK(err, "modify_return", "attach failed: %d\n", err)) |
| goto cleanup; |
| |
| skel->bss->input_retval = input_retval; |
| prog_fd = bpf_program__fd(skel->progs.fmod_ret_test); |
| err = bpf_prog_test_run(prog_fd, 1, NULL, 0, NULL, 0, |
| &retval, &duration); |
| |
| CHECK(err, "test_run", "err %d errno %d\n", err, errno); |
| |
| side_effect = UPPER(retval); |
| ret = LOWER(retval); |
| |
| CHECK(ret != want_ret, "test_run", |
| "unexpected ret: %d, expected: %d\n", ret, want_ret); |
| CHECK(side_effect != want_side_effect, "modify_return", |
| "unexpected side_effect: %d\n", side_effect); |
| |
| CHECK(skel->bss->fentry_result != 1, "modify_return", |
| "fentry failed\n"); |
| CHECK(skel->bss->fexit_result != 1, "modify_return", |
| "fexit failed\n"); |
| CHECK(skel->bss->fmod_ret_result != 1, "modify_return", |
| "fmod_ret failed\n"); |
| |
| cleanup: |
| modify_return__destroy(skel); |
| } |
| |
| void test_modify_return(void) |
| { |
| run_test(0 /* input_retval */, |
| 1 /* want_side_effect */, |
| 4 /* want_ret */); |
| run_test(-EINVAL /* input_retval */, |
| 0 /* want_side_effect */, |
| -EINVAL /* want_ret */); |
| } |
| |