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1// SPDX-License-Identifier: GPL-2.02/* Copyright (c) 2019 Facebook */3#include <linux/bpf.h>4#include <bpf/bpf_helpers.h>5#include <bpf/bpf_tracing.h>6 7struct sk_buff {8 unsigned int len;9};10 11__u64 test_result = 0;12 13SEC("fexit/test_pkt_md_access")14int BPF_PROG(test_main2, struct sk_buff *skb, int ret)15{16 int len;17 18 __builtin_preserve_access_index(({19 len = skb->len;20 }));21 if (len != 74 || ret != 0)22 return 0;23 24 test_result = 1;25 return 0;26}27char _license[] SEC("license") = "GPL";28