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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright 2020 Google LLC.
*/
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
char _license[] SEC("license") = "GPL";
static int sequence = 0;
__s32 input_retval = 0;
__u64 fentry_result = 0;
SEC("fentry/bpf_modify_return_test")
int BPF_PROG(fentry_test, int a, __u64 b)
{
sequence++;
fentry_result = (sequence == 1);
return 0;
}
__u64 fmod_ret_result = 0;
SEC("fmod_ret/bpf_modify_return_test")
int BPF_PROG(fmod_ret_test, int a, int *b, int ret)
{
sequence++;
/* This is the first fmod_ret program, the ret passed should be 0 */
fmod_ret_result = (sequence == 2 && ret == 0);
return input_retval;
}
__u64 fexit_result = 0;
SEC("fexit/bpf_modify_return_test")
int BPF_PROG(fexit_test, int a, __u64 b, int ret)
{
sequence++;
/* If the input_reval is non-zero a successful modification should have
* occurred.
*/
if (input_retval)
fexit_result = (sequence == 3 && ret == input_retval);
else
fexit_result = (sequence == 3 && ret == 4);
return 0;
}
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