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raw_socket.rs
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raw_socket.rs
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use std::cell::RefCell;
use std::io;
use std::os::unix::io::{AsRawFd, RawFd};
use std::rc::Rc;
use std::vec::Vec;
use crate::phy::{self, sys, Device, DeviceCapabilities, Medium};
use crate::time::Instant;
/// A socket that captures or transmits the complete frame.
#[derive(Debug)]
pub struct RawSocket {
medium: Medium,
lower: Rc<RefCell<sys::RawSocketDesc>>,
mtu: usize,
}
impl AsRawFd for RawSocket {
fn as_raw_fd(&self) -> RawFd {
self.lower.borrow().as_raw_fd()
}
}
impl RawSocket {
/// Creates a raw socket, bound to the interface called `name`.
///
/// This requires superuser privileges or a corresponding capability bit
/// set on the executable.
pub fn new(name: &str, medium: Medium) -> io::Result<RawSocket> {
let mut lower = sys::RawSocketDesc::new(name, medium)?;
lower.bind_interface()?;
let mut mtu = lower.interface_mtu()?;
// FIXME(thvdveld): this is a workaround for https://github.com/smoltcp-rs/smoltcp/issues/622
#[cfg(feature = "medium-ieee802154")]
if medium == Medium::Ieee802154 {
mtu += 2;
}
#[cfg(feature = "medium-ethernet")]
if medium == Medium::Ethernet {
// SIOCGIFMTU returns the IP MTU (typically 1500 bytes.)
// smoltcp counts the entire Ethernet packet in the MTU, so add the Ethernet header size to it.
mtu += crate::wire::EthernetFrame::<&[u8]>::header_len()
}
Ok(RawSocket {
medium,
lower: Rc::new(RefCell::new(lower)),
mtu,
})
}
}
impl Device for RawSocket {
type RxToken<'a> = RxToken
where
Self: 'a;
type TxToken<'a> = TxToken
where
Self: 'a;
fn capabilities(&self) -> DeviceCapabilities {
DeviceCapabilities {
max_transmission_unit: self.mtu,
medium: self.medium,
..DeviceCapabilities::default()
}
}
fn receive(&mut self, _timestamp: Instant) -> Option<(Self::RxToken<'_>, Self::TxToken<'_>)> {
let mut lower = self.lower.borrow_mut();
let mut buffer = vec![0; self.mtu];
match lower.recv(&mut buffer[..]) {
Ok(size) => {
buffer.resize(size, 0);
let rx = RxToken { buffer };
let tx = TxToken {
lower: self.lower.clone(),
};
Some((rx, tx))
}
Err(err) if err.kind() == io::ErrorKind::WouldBlock => None,
Err(err) => panic!("{}", err),
}
}
fn transmit(&mut self, _timestamp: Instant) -> Option<Self::TxToken<'_>> {
Some(TxToken {
lower: self.lower.clone(),
})
}
}
#[doc(hidden)]
pub struct RxToken {
buffer: Vec<u8>,
}
impl phy::RxToken for RxToken {
fn consume<R, F>(mut self, f: F) -> R
where
F: FnOnce(&mut [u8]) -> R,
{
f(&mut self.buffer[..])
}
}
#[doc(hidden)]
pub struct TxToken {
lower: Rc<RefCell<sys::RawSocketDesc>>,
}
impl phy::TxToken for TxToken {
fn consume<R, F>(self, len: usize, f: F) -> R
where
F: FnOnce(&mut [u8]) -> R,
{
let mut lower = self.lower.borrow_mut();
let mut buffer = vec![0; len];
let result = f(&mut buffer);
match lower.send(&buffer[..]) {
Ok(_) => {}
Err(err) if err.kind() == io::ErrorKind::WouldBlock => {
net_debug!("phy: tx failed due to WouldBlock")
}
Err(err) => panic!("{}", err),
}
result
}
}