1 // SPDX-License-Identifier: GPL-2.0-only 2 /* Copyright (c) 2020 Facebook */ 3 #include <stddef.h> 4 #include <linux/bpf.h> 5 #include <bpf/bpf_helpers.h> 6 7 __noinline int foo(struct __sk_buff *skb) 8 { 9 return bpf_get_prandom_u32(); 10 } 11 12 SEC("cgroup_skb/ingress") 13 int test_cls(struct __sk_buff *skb) 14 { 15 if (!foo(skb)) 16 return 0; 17 18 return 1; 19 } 20