// SPDX-License-Identifier: GPL-2.0 // Copyright (c) 2019 Facebook #include <linux/bpf.h> #include <bpf/bpf_helpers.h> #define barrier() __asm__ __volatile__("": : :"memory") char _license[] SEC("license") = "GPL"; SEC("socket") int while_true(volatile struct __sk_buff* skb) { int i = 0; while (1) { if (skb->len) i += 3; else i += 7; if (i == 9) break; barrier(); if (i == 10) break; barrier(); if (i == 13) break; barrier(); if (i == 14) break; } return i; }