tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#include <linux/bpf.h>
2
3#include "bpf_helpers.h"
4#include "bpf_endian.h"
5
6int _version SEC("version") = 1;
7
8SEC("sk_msg1")
9int bpf_prog1(struct sk_msg_md *msg)
10{
11 void *data_end = (void *)(long) msg->data_end;
12 void *data = (void *)(long) msg->data;
13
14 char *d;
15
16 if (data + 8 > data_end)
17 return SK_DROP;
18
19 bpf_printk("data length %i\n", (__u64)msg->data_end - (__u64)msg->data);
20 d = (char *)data;
21 bpf_printk("hello sendmsg hook %i %i\n", d[0], d[1]);
22
23 return SK_PASS;
24}
25
26char _license[] SEC("license") = "GPL";