1// SPDX-License-Identifier: GPL-2.0 2#include <linux/bpf.h> 3#include <bpf/bpf_helpers.h> 4#include "bpf_misc.h" 5 6#define __unused __attribute__((unused)) 7 8struct { 9 __uint(type, BPF_MAP_TYPE_PROG_ARRAY); 10 __uint(max_entries, 1); 11 __uint(key_size, sizeof(__u32)); 12 __uint(value_size, sizeof(__u32)); 13} jmp_table SEC(".maps"); 14 15int done = 0; 16 17SEC("tc") 18int classifier_0(struct __sk_buff *skb __unused) 19{ 20 done = 1; 21 return 0; 22} 23 24static __noinline 25int subprog_tail(struct __sk_buff *skb) 26{ 27 /* Don't propagate the constant to the caller */ 28 volatile int ret = 1; 29 30 bpf_tail_call_static(skb, &jmp_table, 0); 31 return ret; 32} 33 34SEC("tc") 35int entry(struct __sk_buff *skb) 36{ 37 /* Have data on stack which size is not a multiple of 8 */ 38 volatile char arr[1] = {}; 39 40 __sink(arr[0]); 41 42 return subprog_tail(skb); 43} 44 45char __license[] SEC("license") = "GPL"; 46