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#![cfg(any(target_os = "linux", target_os = "macos"))]
use std::{io, os::fd::AsRawFd};
use socket2::Domain;
use talpid_types::ErrorExt;
#[cfg(target_os = "macos")]
const SIOCSIFMTU: u64 = 0x80206934;
#[cfg(target_os = "macos")]
const SIOCGIFMTU: u64 = 0xc0206933;
#[cfg(target_os = "linux")]
const SIOCSIFMTU: u64 = libc::SIOCSIFMTU;
#[cfg(target_os = "linux")]
const SIOCGIFMTU: u64 = libc::SIOCSIFMTU;
pub fn set_mtu(interface_name: &str, mtu: u16) -> Result<(), io::Error> {
let sock = socket2::Socket::new(
Domain::IPV4,
socket2::Type::STREAM,
Some(socket2::Protocol::TCP),
)?;
let mut ifr: libc::ifreq = unsafe { std::mem::zeroed() };
if interface_name.len() >= ifr.ifr_name.len() {
return Err(io::Error::new(
io::ErrorKind::InvalidInput,
"Interface name too long",
));
}
// SAFETY: `interface_name.len()` is less than `ifr.ifr_name.len()`
unsafe {
std::ptr::copy_nonoverlapping(
interface_name.as_ptr() as *const libc::c_char,
&mut ifr.ifr_name as *mut _,
interface_name.len(),
)
};
ifr.ifr_ifru.ifru_mtu = mtu as i32;
// SAFETY: SIOCSIFMTU expects an ifreq with an MTU and interface set
if unsafe { libc::ioctl(sock.as_raw_fd(), SIOCSIFMTU, &ifr) } < 0 {
let e = std::io::Error::last_os_error();
log::error!("{}", e.display_chain_with_msg("SIOCSIFMTU failed"));
return Err(e);
}
Ok(())
}
pub fn get_mtu(interface_name: &str) -> Result<u16, io::Error> {
let sock = socket2::Socket::new(
Domain::IPV4,
socket2::Type::STREAM,
Some(socket2::Protocol::TCP),
)?;
let mut ifr: libc::ifreq = unsafe { std::mem::zeroed() };
if interface_name.len() >= ifr.ifr_name.len() {
return Err(io::Error::new(
io::ErrorKind::InvalidInput,
"Interface name too long",
));
}
// SAFETY: `interface_name.len()` is less than `ifr.ifr_name.len()`
unsafe {
std::ptr::copy_nonoverlapping(
interface_name.as_ptr() as *const libc::c_char,
&mut ifr.ifr_name as *mut _,
interface_name.len(),
)
};
// SAFETY: SIOCGIFMTU expects an ifreq with an interface set
if unsafe { libc::ioctl(sock.as_raw_fd(), SIOCGIFMTU, &ifr) } < 0 {
let e = std::io::Error::last_os_error();
log::error!("{}", e.display_chain_with_msg("SIOCGIFMTU failed"));
return Err(e);
}
// SAFETY: ifru_mtu is initialized by SIOCGIFMTU
Ok(u16::try_from(unsafe { ifr.ifr_ifru.ifru_mtu }).unwrap())
}
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