Orange Pi5 kernel

#include <linux/bpf.h>
 
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_endian.h>
 
int _version SEC("version") = 1;
 
SEC("sk_msg1")
int bpf_prog1(struct sk_msg_md *msg)
{
<------>void *data_end = (void *)(long) msg->data_end;
<------>void *data = (void *)(long) msg->data;
 
<------>char *d;
 
<------>if (data + 8 > data_end)
<------><------>return SK_DROP;
 
<------>bpf_printk("data length %i\n", (__u64)msg->data_end - (__u64)msg->data);
<------>d = (char *)data;
<------>bpf_printk("hello sendmsg hook %i %i\n", d[0], d[1]);
 
<------>return SK_PASS;
}
 
char _license[] SEC("license") = "GPL";