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

   1// SPDX-License-Identifier: GPL-2.0-only
   2#include <stddef.h>
   3#include <linux/bpf.h>
   4#include <bpf/bpf_helpers.h>
   5
   6struct Small {
   7        int x;
   8};
   9
  10struct Big {
  11        int x;
  12        int y;
  13};
  14
  15__noinline int foo(const struct Big *big)
  16{
  17        if (!big)
  18                return 0;
  19
  20        return bpf_get_prandom_u32() < big->y;
  21}
  22
  23SEC("cgroup_skb/ingress")
  24int test_cls(struct __sk_buff *skb)
  25{
  26        const struct Small small = {.x = skb->len };
  27
  28        return foo((struct Big *)&small) ? 1 : 0;
  29}
  30