Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0
#include <linux/bpf.h>
 
#include <bpf/bpf_helpers.h>
 
struct {
<------>__uint(type, BPF_MAP_TYPE_PROG_ARRAY);
<------>__uint(max_entries, 1);
<------>__uint(key_size, sizeof(__u32));
<------>__uint(value_size, sizeof(__u32));
} jmp_table SEC(".maps");
 
static volatile int count;
 
SEC("classifier/0")
int bpf_func_0(struct __sk_buff *skb)
{
<------>count++;
<------>bpf_tail_call_static(skb, &jmp_table, 0);
<------>return 1;
}
 
SEC("classifier")
int entry(struct __sk_buff *skb)
{
<------>bpf_tail_call_static(skb, &jmp_table, 0);
<------>return 0;
}
 
char __license[] SEC("license") = "GPL";
int _version SEC("version") = 1;