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network: configure mtu and segmentation offloading properly

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This commit is contained in:
Alex Zenla
2024-03-04 12:19:03 +00:00
parent 9350a7520d
commit 17889d1c64
8 changed files with 131 additions and 7 deletions
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7
network/src/backend.rs
View File

@ -4,7 +4,7 @@ use crate::nat::Nat;
use crate::proxynat::ProxyNatHandlerFactory;
use crate::raw_socket::{AsyncRawSocketChannel, RawSocketHandle, RawSocketProtocol};
use crate::vbridge::{BridgeJoinHandle, VirtualBridge};
use crate::FORCE_MTU;
use crate::EXTRA_MTU;
use anyhow::{anyhow, Result};
use bytes::BytesMut;
use futures::TryStreamExt;
@ -120,8 +120,9 @@ impl NetworkBackend {
self.metadata.gateway.ipv4.into(),
self.metadata.gateway.ipv6.into(),
];
let kdev = RawSocketHandle::bound_to_interface(&interface, RawSocketProtocol::Ethernet)?;
let mtu = FORCE_MTU;
let mut kdev =
RawSocketHandle::bound_to_interface(&interface, RawSocketProtocol::Ethernet)?;
let mtu = kdev.mtu_of_interface(&interface)? + EXTRA_MTU;
let (tx_sender, tx_receiver) = channel::<BytesMut>(TX_CHANNEL_BUFFER_LEN);
let mut udev = ChannelDevice::new(mtu, Medium::Ethernet, tx_sender.clone());
let mac = self.metadata.gateway.mac;

6
network/src/lib.rs
View File

@ -22,7 +22,8 @@ pub mod proxynat;
pub mod raw_socket;
pub mod vbridge;
pub const FORCE_MTU: usize = 65521;
const HOST_BRIDGE_MTU: usize = 1500;
pub const EXTRA_MTU: usize = 20;
pub struct NetworkService {
pub backends: HashMap<Uuid, JoinHandle<()>>,
@ -33,7 +34,8 @@ pub struct NetworkService {
impl NetworkService {
pub async fn new() -> Result<NetworkService> {
let bridge = VirtualBridge::new()?;
let hbridge = HostBridge::new(FORCE_MTU, "krata0".to_string(), &bridge).await?;
let hbridge =
HostBridge::new(HOST_BRIDGE_MTU + EXTRA_MTU, "krata0".to_string(), &bridge).await?;
Ok(NetworkService {
backends: HashMap::new(),
bridge,

11
network/src/raw_socket.rs
View File

@ -255,7 +255,10 @@ impl AsyncRawSocketChannel {
}
let buffer = (&buffer[0..len]).into();
if let Err(error) = receive_sender.try_send(buffer) {
debug!("raw socket failed to process received packet: {}", error);
debug!(
"failed to process received packet from raw socket: {}",
error
);
}
}
@ -276,7 +279,11 @@ impl AsyncRawSocketChannel {
debug!("failed to transmit: would block");
continue;
}
return Err(anyhow!("failed to write to raw socket: {}", error));
return Err(anyhow!(
"failed to write {} bytes to raw socket: {}",
packet.len(),
error
));
}
};
}