tools/testing/selftests/bpf/progs/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
   7 struct sk_buff {
   8         unsigned int len;
   9 };
  10
  11 __u64 test_result = 0;
  12
  13 SEC("fexit/test_pkt_md_access")
  14 int 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 }
  27 char _license[] SEC("license") = "GPL";