fexit_bpf2bpf_simple.c

 1// SPDX-License-Identifier: GPL-2.0
 2/* 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";