LXR linux/tools/testing/selftests/bpf/progs/fexit_bpf2bpf

   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";
  28