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network: virtual bridge now checks multicast bit to determine whether to broadcast packet

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Alex Zenla 2024-02-13 12:22:52 +00:00
parent bbad037b5d
commit b7db12cf68
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GPG Key ID: 067B238899B51269
1 changed files with 7 additions and 12 deletions
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19
network/src/vbridge.rs
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@ -19,8 +19,6 @@ use tokio::{
task::JoinHandle, task::JoinHandle,
}; };
const BROADCAST_MAC_ADDR: &[u8; 6] = &[0xff; 6];
const BRIDGE_TX_QUEUE_LEN: usize = 50; const BRIDGE_TX_QUEUE_LEN: usize = 50;
const BRIDGE_RX_QUEUE_LEN: usize = 50; const BRIDGE_RX_QUEUE_LEN: usize = 50;
const BROADCAST_RX_QUEUE_LEN: usize = 50; const BROADCAST_RX_QUEUE_LEN: usize = 50;
@ -36,7 +34,7 @@ pub struct BridgeJoinHandle {
pub broadcast_rx_receiver: BroadcastReceiver<BytesMut>, pub broadcast_rx_receiver: BroadcastReceiver<BytesMut>,
} }
type VirtualBridgeMemberMap = Arc<Mutex<HashMap<[u8; 6], BridgeMember>>>; type VirtualBridgeMemberMap = Arc<Mutex<HashMap<EthernetAddress, BridgeMember>>>;
#[derive(Clone)] #[derive(Clone)]
pub struct VirtualBridge { pub struct VirtualBridge {
@ -87,7 +85,7 @@ impl VirtualBridge {
let (bridge_rx_sender, bridge_rx_receiver) = channel::<BytesMut>(BRIDGE_RX_QUEUE_LEN); let (bridge_rx_sender, bridge_rx_receiver) = channel::<BytesMut>(BRIDGE_RX_QUEUE_LEN);
let member = BridgeMember { bridge_rx_sender }; let member = BridgeMember { bridge_rx_sender };
match self.members.lock().await.entry(mac.0) { match self.members.lock().await.entry(mac) {
Entry::Occupied(_) => { Entry::Occupied(_) => {
return Err(anyhow!( return Err(anyhow!(
"virtual bridge already has a member with address {}", "virtual bridge already has a member with address {}",
@ -136,7 +134,7 @@ impl VirtualBridge {
// recalculate TCP checksums when routing packets. // recalculate TCP checksums when routing packets.
// the xen network backend / frontend drivers for linux // the xen network backend / frontend drivers for linux
// are very stupid and do not calculate these properly // are very stupid and do not calculate these properly
// despite all best attempts as making it do so. // despite all best attempts at making it do so.
if ipv4.protocol == IpNumber::TCP { if ipv4.protocol == IpNumber::TCP {
let (mut tcp, payload) = TcpHeader::from_slice(payload)?; let (mut tcp, payload) = TcpHeader::from_slice(payload)?;
tcp.checksum = tcp.calc_checksum_ipv4(&ipv4, payload)?; tcp.checksum = tcp.calc_checksum_ipv4(&ipv4, payload)?;
@ -148,8 +146,8 @@ impl VirtualBridge {
} }
} }
let destination = &header.destination; let destination = EthernetAddress(header.destination);
if destination == BROADCAST_MAC_ADDR { if destination.is_multicast() {
trace!( trace!(
"broadcasting bridged packet from {}", "broadcasting bridged packet from {}",
EthernetAddress(header.source) EthernetAddress(header.source)
@ -157,7 +155,7 @@ impl VirtualBridge {
broadcast_rx_sender.send(packet.as_slice().into())?; broadcast_rx_sender.send(packet.as_slice().into())?;
continue; continue;
} }
match members.lock().await.get(destination) { match members.lock().await.get(&destination) {
Some(member) => { Some(member) => {
member.bridge_rx_sender.try_send(packet.as_slice().into())?; member.bridge_rx_sender.try_send(packet.as_slice().into())?;
trace!( trace!(
@ -167,10 +165,7 @@ impl VirtualBridge {
); );
} }
None => { None => {
trace!( trace!("no bridge member with address: {}", destination);
"no bridge member with address: {}",
EthernetAddress(*destination)
);
} }
} }
} }