classic_bpf 0.1.1

Build and attach classic BPF programs to sockets.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37

use crate::bpf_base::*;
use std::mem::size_of;
use std::os::unix::io::RawFd;

impl BPFOperations for BPFFProg<'_> {
    fn attach_filter(self, socket_raw_fd: RawFd) -> Result<(), i32> {
        match unsafe {
            libc::setsockopt(
                socket_raw_fd,
                libc::SOL_SOCKET,
                libc::SO_ATTACH_FILTER,
                &self as *const _ as *const libc::c_void,
                size_of::<BPFFProg>() as u32,
            )
        } {
            0 => Ok(()),
            errno => Err(errno),
        }
    }
}

/// remove the classic BPF program attached to a socket
pub fn detach_filter(socket_raw_fd: RawFd) -> Result<(), i32> {
    match unsafe {
        libc::setsockopt(
            socket_raw_fd,
            libc::SOL_SOCKET,
            libc::SO_DETACH_FILTER,
            std::ptr::null::<libc::c_void>(),
            0,
        )
    } {
        0 => Ok(()),
        errno => Err(errno),
    }
}
// test